CN111413634A - Soft package lithium battery insulation test method - Google Patents

Soft package lithium battery insulation test method Download PDF

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Publication number
CN111413634A
CN111413634A CN202010228463.9A CN202010228463A CN111413634A CN 111413634 A CN111413634 A CN 111413634A CN 202010228463 A CN202010228463 A CN 202010228463A CN 111413634 A CN111413634 A CN 111413634A
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China
Prior art keywords
lithium battery
package lithium
insulation test
tested
soft
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CN202010228463.9A
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Chinese (zh)
Inventor
王子乐
许永顺
蒋新欣
刘璇
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Huizhou Yiwei Energy Collection Co ltd
Eve Energy Co Ltd
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Huizhou Yiwei Energy Collection Co ltd
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Priority to CN202010228463.9A priority Critical patent/CN111413634A/en
Publication of CN111413634A publication Critical patent/CN111413634A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

According to the insulation test method for the soft package lithium battery, the edge sealing area of the soft package lithium battery to be tested is cut to form the chamfered part through cutting the edge sealing area of the soft package lithium battery to be tested, the aluminum layer of the aluminum-plastic film in the soft package lithium battery to be tested can be completely exposed through the cutting operation, when the insulation test is subsequently performed on the soft package lithium battery to be tested, the conductive rubber block of the insulation test instrument can be stably contacted with the aluminum layer of the aluminum-plastic film in the soft package lithium battery to be tested, the phenomenon that the aluminum layer is covered by the overflowed PP layer due to heat sealing of the side edge is avoided, the conductive rubber block of the insulation test instrument cannot be contacted with the aluminum layer of the aluminum-plastic film in the soft package lithium battery to be tested, the accuracy of insulation resistance test is further influenced, the misjudgment rate of the insulation test is greatly reduced, and the accuracy of the insulation.

Description

Soft package lithium battery insulation test method
Technical Field
The invention relates to the technical field of batteries, in particular to a soft package lithium battery insulation test method.
Background
Currently, a battery refers to a device that converts chemical energy into electrical energy in a portion of the space of a cup, tank, or other container or composite container that holds an electrolyte solution and metal electrodes to generate an electric current. Has a positive electrode and a negative electrode. With the advancement of technology, batteries generally refer to small devices that can generate electrical energy. Such as a solar cell. The performance parameters of the battery are mainly electromotive force, capacity, specific energy and resistance. The battery is used as an energy source, can obtain current which has stable voltage and current, is stably supplied for a long time and is slightly influenced by the outside, has simple structure, convenient carrying, simple and easy charging and discharging operation, is not influenced by the outside climate and temperature, has stable and reliable performance, and plays a great role in various aspects of modern social life.
The kinds of batteries are various, for example, a lithium pouch battery; as another example, a button cell; as another example, a pin cell. Taking a soft package lithium battery as an example, due to a plurality of advantages, the soft package lithium battery is applied to a plurality of fields, the most common mobile phone field is used, and most of the existing mobile phone batteries are soft package lithium batteries. In the actual production manufacturing process of soft packet of lithium cell, in order to guarantee the output quality of soft packet of lithium cell, soft packet of lithium cell can be arranged and carry out various tests, prevents that its security of soft packet of lithium cell of production from reaching the requirement of production, when the user has used soft packet of lithium cell of not up to standard, just has very big potential safety hazard, threatens user's life safety constantly.
The important safety test of soft packet of lithium cell is regarded as in insulation test, and aim at detects the insulation resistance size of soft packet of lithium cell, and the insulation resistance undersize of soft packet of lithium cell should not otherwise take place the electron short circuit easily for soft packet of lithium cell, takes place electrochemical corrosion promptly to the life of soft packet of lithium cell has been influenced, can lead to the user to appear the incident when using even when serious, and from this it is visible, and insulation test is a very important process of soft packet of lithium cell. The insulation resistance test of the soft package lithium battery actually tests whether the negative electrode tab is conducted with an aluminum layer in an aluminum plastic film. The existing testing method comprises the steps that a metal clamp is used for clamping a cathode tab, the metal clamp is connected with an insulation testing device, then a conductive adhesive block is used for contacting an aluminum layer in an aluminum-plastic film at the position of a side edge, the conductive adhesive block is connected with the insulation testing device, and the insulation testing of the soft package lithium battery is completed according to the insulation resistance displayed on the insulation testing device. Although the insulating test to soft packet of lithium cell can be accomplished to above-mentioned mode, but foretell test method has the defect, because soft packet of lithium cell is at the in-process of encapsulation, need carry out heat-seal treatment to soft packet of lithium cell's side, under the effect of high temperature, the PP layer in the plastic-aluminum membrane overflows easily under high temperature, the PP layer that overflows promptly can cover the aluminium lamination, lead to electrically conductive gluey piece and aluminium lamination contact failure, the aluminium lamination can not be contacted to electrically conductive gluey piece even, and then lead to the insulation resistance of the soft packet of lithium cell of unable accurate test, there is very big misjudgement rate.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the insulation test method for the soft package lithium battery, which can stably test the insulation resistance of the soft package lithium battery, and has high insulation test accuracy and low misjudgment rate.
The purpose of the invention is realized by the following technical scheme:
a soft package lithium battery insulation test method comprises the following steps:
step S01, cutting the edge sealed area of the soft package lithium battery to be tested to form a chamfer part, wherein the chamfer part is provided with a contact inclined plane;
step S02, performing insulation test on the soft package lithium battery to be tested, enabling a conductive adhesive block of an insulation test instrument to be in contact with the contact inclined plane, enabling a metal clamp of the insulation test instrument to clamp a negative pole tab of the soft package lithium battery to be tested, and reading an insulation resistance value displayed by the insulation test instrument;
step S03, if the insulation resistance value is larger than a preset insulation resistance value, judging that the insulation test of the soft package lithium battery to be tested is qualified; otherwise, judging that the soft package lithium battery to be tested is unqualified in insulation test.
In one embodiment, in step S01:
before cutting a sealed edge area of a to-be-tested soft package lithium battery, measuring a total battery width value, a total battery cell width value and a total internal unsealed width value of the to-be-tested soft package lithium battery, and calculating a sealed edge width value according to the total battery width value, the total battery cell width value and the total internal unsealed width value, wherein the sealed edge width value is (the total battery width value-the total battery cell width value-the total internal unsealed width value)/2;
after the cutting operation is carried out on the edge sealing area of the soft package lithium battery to be tested, the length value of the contact inclined plane COS45 degrees is smaller than or equal to the edge sealing width value.
In one embodiment, in step S01:
and measuring the total width value of the battery, the total width value of the battery core and the total width value of the inner non-seal of the soft package lithium battery to be tested by using a ruler.
In one embodiment, in step S02:
before the soft package lithium battery to be tested is subjected to insulation test, the conductive rubber block of the insulation test instrument is correspondingly contacted with the contact inclined planes positioned in the edge sealing areas at two sides of the soft package lithium battery to be tested, the contact resistance value displayed by the insulation test instrument is read, and if the contact resistance value is smaller than or equal to the preset contact resistance value, the soft package lithium battery to be tested can be judged to be subjected to insulation test; otherwise, judging that the soft package lithium battery to be tested cannot be subjected to insulation test.
In one embodiment, the preset contact resistance value is [0M Ω, 0.05M Ω ].
In one embodiment, the preset contact resistance value is 0.05M Ω.
In one embodiment, in step S02:
and enabling a conductive rubber block of the insulation test instrument to be in contact with the contact inclined plane and completely cover the contact inclined plane.
In one embodiment, in step S02:
before carrying out insulation test to the soft packet of lithium cell of awaiting measuring, the conductive rubber piece of processing insulation test instrument lets the conductive rubber piece of insulation test instrument form electrically conductive chamfer portion, lets electrically conductive chamfer portion with contact inclined plane contact covers completely contact inclined plane.
In one embodiment, the predetermined insulation resistance value is greater than or equal to 500M Ω.
In one embodiment, the predetermined insulation resistance value is equal to 500M Ω.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the insulation test method for the soft package lithium battery, the edge sealing area of the soft package lithium battery to be tested is cut to form the chamfered part through cutting the edge sealing area of the soft package lithium battery to be tested, the aluminum layer of the aluminum-plastic film in the soft package lithium battery to be tested can be completely exposed through the cutting operation, when the insulation test is subsequently performed on the soft package lithium battery to be tested, the conductive rubber block of the insulation test instrument can be stably contacted with the aluminum layer of the aluminum-plastic film in the soft package lithium battery to be tested, the phenomenon that the aluminum layer is covered by the overflowed PP layer due to heat sealing of the side edge is avoided, the conductive rubber block of the insulation test instrument cannot be contacted with the aluminum layer of the aluminum-plastic film in the soft package lithium battery to be tested, the accuracy of insulation resistance test is further influenced, the misjudgment rate of the insulation test is greatly reduced, and the accuracy of the insulation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic flow chart illustrating steps of a soft-package lithium battery insulation testing method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a soft-packed lithium battery before being trimmed according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a cut soft-package lithium battery according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that, due to the advantages of the lithium pouch battery, the lithium pouch battery is applied to many fields, for example, most of the mobile phone batteries are the lithium pouch batteries. In the actual production and manufacturing process of the soft package lithium battery, in order to ensure the output quality of the soft package lithium battery, the soft package lithium battery needs to be subjected to various tests, such as an explosion-proof test; as another example, high temperature testing; as another example, aging tests; as another example, insulation testing. The test is that the security of the soft package lithium battery for preventing the production can not meet the production requirement, and when the user uses the soft package lithium battery which can not reach the standard, a very large potential safety hazard exists, and the life safety of the user is endangered all the time.
Use insulation test as an example, insulation test is as an important safety test of soft packet of lithium cell, and aim at detects the insulation resistance size of soft packet of lithium cell, prevents that the insulation resistance undersize of soft packet of lithium cell from taking place electron short circuit phenomenon easily, and soft packet of lithium cell takes place electrochemical corrosion promptly to influenced the life of soft packet of lithium cell, can lead to the user to appear the incident when using even when serious. The insulation test can be said to be a test flow which must be involved before the soft package lithium battery is produced. For the insulation test of the soft package lithium battery, the insulation resistance test of the soft package lithium battery actually tests whether the negative electrode tab is conducted with the aluminum layer in the aluminum plastic film. The existing testing method comprises the steps that a metal clamp is used for clamping a cathode tab, the metal clamp is connected with an insulation testing device, then a conductive adhesive block is used for contacting an aluminum layer in an aluminum plastic film at a side position, namely the conductive adhesive block is used for contacting the aluminum layer at a heat sealing position of the soft package lithium battery, the conductive adhesive block is connected with the insulation testing device, and whether the insulation resistance of the soft package lithium battery reaches the standard or not is judged according to the insulation resistance displayed on the insulation testing device. Although the insulation resistance test to soft packet of lithium cell can be accomplished to above-mentioned mode, there is the defect in foretell testing method, because soft packet of lithium cell is at the in-process of encapsulation, need carry out the heat-seal processing to soft packet of lithium cell's side, under the effect of high temperature, the PP layer in the plastic-aluminum membrane spills over easily under high temperature, the PP layer that spills over promptly can cover the aluminium lamination, lead to electrically conductive gluey piece and aluminium lamination contact failure, the aluminium lamination can not be contacted to electrically conductive gluey piece even, and then lead to the insulation resistance of the soft packet of lithium cell of unable accurate test, there is very big misjudgement rate.
Therefore, based on the above problems, the application discloses an insulation test method for a soft package lithium battery, which can stably test the insulation resistance of the soft package lithium battery, and can ensure high accuracy and low misjudgment rate of the insulation test.
Referring to fig. 1, a method for testing insulation of a soft package lithium battery includes the following steps:
and S01, cutting the edge sealed area of the soft package lithium battery to be tested to form a chamfer part, wherein the chamfer part is provided with a contact inclined plane.
It should be noted that, the trimming operation is performed on the edge banding area of the soft package lithium battery to be tested, so that the edge banding area of the soft package lithium battery to be tested is trimmed to form a chamfered portion, that is, the edge banding area of the soft package lithium battery to be tested is trimmed by using a trimming tool, such as a pair of scissors, to form the chamfered portion, the existence of the chamfered portion can completely expose the aluminum layer of the aluminum plastic film in the soft package lithium battery to be tested, so as to prevent the overflow of the PP layer from completely covering the aluminum layer, and in the subsequent insulation test of the soft package lithium battery to be tested, the overflow PP layer covers the aluminum layer, so that the conductive adhesive block of the insulation test instrument cannot contact the aluminum layer of the aluminum plastic film in the soft package lithium battery to be tested, thereby affecting the accuracy of the insulation resistance test, greatly reducing the misjudgment rate of the insulation test, ensuring the accuracy of the insulation test, and the conductive adhesive block can well contact the aluminum layer, and further, the insulation test of the soft package lithium battery to be tested is influenced.
And S02, performing insulation test on the soft package lithium battery to be tested, enabling the conductive adhesive block of the insulation test instrument to be in contact with the contact inclined plane, clamping the negative electrode tab of the soft package lithium battery to be tested by the metal clamp of the insulation test instrument, and reading the insulation resistance value displayed by the insulation test instrument.
So, it should explain, after cutting out formation chamfer portion in the banding region of the soft packet of lithium cell of awaiting measuring, let the aluminium lamination of chamfer position department expose promptly, at this moment, can carry out the work of insulation test to the soft packet of lithium cell of awaiting measuring, with the conducting resin piece and the contact inclined plane contact of insulation test instrument, and simultaneously, let the metal anchor clamps centre gripping of insulation test instrument await measuring soft packet of lithium cell's negative pole utmost point ear, read the insulation resistance value that insulation test instrument shows at last and can accomplish and carry out insulation test work to the soft packet of lithium cell of awaiting measuring, the testing personnel judge whether the soft packet of lithium cell of awaiting measuring accords with the standard of insulation test according to the insulation resistance value of reading.
Step S03, if the insulation resistance value is larger than the preset insulation resistance value, judging that the insulation test of the soft package lithium battery to be tested is qualified; otherwise, judging that the soft package lithium battery to be tested is unqualified in insulation test.
Therefore, it should be noted that after the inspector reads the insulation resistance value of the soft package lithium battery to be tested, if the insulation resistance value is greater than the preset insulation resistance value, the insulation test of the soft package lithium battery to be tested is determined to be qualified; otherwise, judging that the soft package lithium battery to be tested is unqualified in insulation test. The insulation test work of the soft package lithium battery to be tested is completed through the steps, the detection steps are simple and convenient, and the efficiency is high.
Specifically, in one embodiment, the predetermined insulation resistance value is greater than or equal to 500M Ω.
In this way, it should be noted that the specific size of the preset insulation resistance value can be flexibly set according to the actual situation, and the preset insulation resistance value is preferably equal to 500M Ω.
It should be further noted that, in the insulation test method for the soft-package lithium battery, the edge-sealed area of the soft-package lithium battery to be tested is cut to form the chamfered part by performing the cutting operation on the edge-sealed area of the soft-package lithium battery to be tested, the cutting operation can completely expose the aluminum layer of the aluminum-plastic film in the soft-package lithium battery to be tested, when the insulation test is carried out on the soft package lithium battery to be tested subsequently, the conductive rubber block of the insulation test instrument can be stably contacted with the aluminum layer of the aluminum-plastic film in the soft package lithium battery to be tested, the aluminum layer cannot be covered by the overflowing PP layer due to the heat sealing of the side edge, so that the conductive rubber block of the insulation test instrument cannot be contacted with the aluminum layer of the aluminum-plastic film in the soft package lithium battery to be tested, therefore, the accuracy of the insulation resistance test is influenced, the misjudgment rate of the insulation test is greatly reduced, and the accuracy of the insulation test is ensured.
Further, referring to fig. 2 and fig. 3 together, in one embodiment, in step S01:
before cutting the edge sealing area of the soft package lithium battery to be tested, measuring a total battery width value, a total battery cell width value and a total internal unsealed width value of the soft package lithium battery to be tested, and calculating the edge sealing width value according to the total battery width value, the total battery cell width value and the total internal unsealed width value, wherein the edge sealing width value is (the total battery width value-the total battery cell width value-the total internal unsealed width value)/2;
after the cutting operation is carried out on the edge sealing area of the soft package lithium battery to be tested, the length value of the contact inclined plane COS45 degrees is smaller than or equal to the edge sealing width value.
So, need explain that, before the formal operation of tailorring is carried out to the banding region of the soft packet of lithium cell of awaiting measuring, owing to have battery electrolyte in the soft packet of lithium cell of awaiting measuring, battery electrolyte is the liquid of chemical property, has certain corrosivity, if when the operation of tailorring is carried out to the banding region of the soft packet of lithium cell of awaiting measuring, leaked out because of tailorring the battery electrolyte in the soft packet of lithium cell of awaiting measuring, no matter be to environment or measurement personnel, all had very big potential safety hazard.
Therefore, in order to avoid the leakage of the battery electrolyte, before the trimming operation is performed on the edge sealing area of the soft package lithium battery to be tested formally, the total width value of the battery (namely, the distance from the AC edge to the JK edge in fig. 2), the total width value of the battery cell (namely, the distance from the EG edge to the FH edge in fig. 2) and the total width value of the battery cell not sealed in the interior (namely, the distance from the BD edge to the EG edge in fig. 2 by 2 times) are measured, the edge sealing width value is calculated according to the total width value of the battery, the total width value of the battery cell and the total width value of the battery cell not sealed in the interior, and: the edge sealing width value is (total width of battery-total width of battery core-total width of inner not sealed)/2. After the edge sealing width value is obtained, after the edge sealing area of the soft-package lithium battery to be tested is cut, the length value of the contact inclined plane COS45 degrees is smaller than or equal to the edge sealing width value, wherein the length value of the contact inclined plane is the length value of the MB side in fig. 3. The purpose of calculating the sealing edge width value is to ensure that the length value of the contact inclined plane of the chamfer part after the lithium battery to be tested is finally cut, COS45 degrees is less than or equal to the sealing edge width value, therefore, the chamfering part can be ensured to be completely positioned in the edge sealing area of the soft package lithium battery to be tested, the part of the chamfering part is prevented from extending into the inner unsealed area of the soft package lithium battery to be tested after the edge sealing area of the soft package lithium battery to be tested is cut, because the inner unsealed area of the soft package lithium battery to be tested is not subjected to heat sealing treatment, if the inner unsealed area of the soft package lithium battery to be tested is cut, the battery electrolyte in the inner unsealed area of the soft package lithium battery to be tested can be leaked out, and calculating the sealing edge width value, and cutting the chamfering part by taking the sealing edge width value as a reference, so as to ensure that the chamfering part is wholly positioned in the sealing edge area of the soft package lithium battery to be tested.
It should be further noted that the length value of the contact inclined plane, COS45 °, is less than or equal to COS45 ° in the edge sealing width value, which means that when the edge sealing area of the soft-package lithium battery to be tested is cut, the included angle between the CM edge and the MB edge is finally 45 °.
Further, in one embodiment, in step S01:
and measuring the total width value of the battery, the total width value of the battery core and the total width value of the inner non-seal of the soft package lithium battery to be tested by using a ruler.
So, it should explain that, when measuring the total width value of the battery of the soft packet of lithium cell that awaits measuring, the total width value of electric core and interior not sealed total width value, can utilize measuring tool ruler to measure the soft packet of lithium cell that awaits measuring, of course, also can measure with other measuring tool, when some measuring tool need proofread, need carry out calibration work to measuring tool after, just measure the soft packet of lithium cell that awaits measuring, prevent because do not proofread and lead to measuring error.
It should be further noted that, because the soft package lithium battery to be tested can be subjected to heat sealing treatment and then subjected to insulation test, after the soft package lithium battery to be tested is subjected to heat sealing treatment, the soft package lithium battery to be tested generally has a bilateral symmetry structure, and both side edges of the soft package lithium battery to be tested have obvious edge sealing marks, please refer to fig. 2 and fig. 3 together, for example, the AC edge, the BD edge, the IK edge and the J L edge are edge sealing marks after heat sealing of the soft package lithium battery to be tested, and in a similar way, the side edges of the battery core of the soft package lithium battery to be tested also have obvious edge sealing marks, for example, the EG edge and the FH edge are edge sealing marks of the side edge of the battery core of the soft package lithium battery to be tested, and a tester can measure a total width value of the battery, a total width value of the battery core and a total width value of an inner unsealed area.
It should be noted that the seal edge width value is preferably calculated in a calculation manner, and a tester may also calculate the seal edge width value by using a ruler, compare the calculated seal edge width value with the measured seal edge width value, and if the difference between the calculated seal edge width value and the measured seal edge width value is within a preset range difference, and the preset range difference is 0.05mm, determine that the calculated seal edge width value is the seal edge width value that we want, otherwise, recalculate until the seal edge width value meets the requirements.
Further, in one embodiment, in step S02:
before the soft package lithium battery to be tested is subjected to insulation test, the conductive rubber block of the insulation test instrument is correspondingly contacted with the contact inclined planes positioned in the edge sealing areas at two sides of the soft package lithium battery to be tested, the contact resistance value displayed by the insulation test instrument is read, and if the contact resistance value is smaller than or equal to the preset contact resistance value, the soft package lithium battery to be tested can be judged to be subjected to insulation test; otherwise, judging that the soft package lithium battery to be tested cannot be subjected to insulation test.
Therefore, before the soft package lithium battery to be tested is subjected to insulation test, the two conductive rubber blocks of the insulation test instrument are correspondingly contacted with the contact inclined planes positioned in the edge sealing areas at two sides of the soft package lithium battery to be tested, namely the two conductive rubber blocks of the insulation test instrument just correspond to the chamfered parts in the edge sealing areas at two sides of the soft package lithium battery to be tested, the two conductive rubber blocks are correspondingly contacted with the two chamfered parts, the contact resistance value displayed by the insulation test instrument is read, and if the contact resistance value is smaller than or equal to the preset contact resistance value, the soft package lithium battery to be tested is judged to be capable of performing insulation test; otherwise, judging that the soft package lithium battery to be tested cannot be subjected to insulation test. The purpose of this step is to ensure whether the aluminum layers in the two chamfered portions are conductive or not, that is, to determine the contact resistance value before formally performing the insulation test on the soft-package lithium battery to be tested.
It should be further explained that after the soft package lithium battery to be tested is judged to be capable of conducting insulation test, insulation test work can be conducted on the soft package lithium battery to be tested, one of the conductive rubber blocks is enabled to contact one of the chamfering portions, the metal clamp clamps the negative pole tab, two conductive rubber blocks do not need to be correspondingly contacted with the two chamfering portions, and only one conductive rubber block needs to be contacted with one chamfering portion.
Specifically, in one embodiment, the predetermined contact resistance value is [0M Ω, 0.05M Ω ].
As described above, the specific size of the preset contact resistance value can be flexibly set according to actual conditions, and the preset contact resistance value is preferably 0.05M Ω.
Further, in one embodiment, in step S02:
and enabling the conductive rubber block of the insulation test instrument to be in contact with the contact inclined plane and completely cover the contact inclined plane.
Therefore, it should be noted that the conductive adhesive block of the insulation test instrument is in contact with the contact inclined plane and completely covers the contact inclined plane, so that the conductive adhesive block is completely in contact with the contact inclined plane, that is, the conductive adhesive block is completely in contact with the aluminum layer, the contact reliability is ensured, and the accuracy of the insulation test is greatly improved.
Further, in one embodiment, in step S02:
before the soft package lithium battery to be tested is subjected to insulation test, the conductive adhesive block of the insulation test instrument is processed, the conductive adhesive block of the insulation test instrument forms a conductive chamfer part, and the conductive chamfer part is contacted with the contact inclined plane and completely covers the contact inclined plane.
So, need explain that, before carrying out insulation test to the soft packet of lithium cell of awaiting measuring, can reform transform the shape of conducting resin piece earlier, let the shape of conducting resin piece match the shape of chamfer portion, make things convenient for the measurement personnel to carry out insulation test to the soft packet of lithium cell of awaiting measuring.
According to the insulation test method for the soft package lithium battery, the edge sealing area of the soft package lithium battery to be tested is cut to form the chamfered part through cutting the edge sealing area of the soft package lithium battery to be tested, the aluminum layer of the aluminum-plastic film in the soft package lithium battery to be tested can be completely exposed through the cutting operation, when the insulation test is subsequently performed on the soft package lithium battery to be tested, the conductive rubber block of the insulation test instrument can be stably contacted with the aluminum layer of the aluminum-plastic film in the soft package lithium battery to be tested, the phenomenon that the aluminum layer is covered by the overflowed PP layer due to heat sealing of the side edge is avoided, the conductive rubber block of the insulation test instrument cannot be contacted with the aluminum layer of the aluminum-plastic film in the soft package lithium battery to be tested, the accuracy of insulation resistance test is further influenced, the misjudgment rate of the insulation test is greatly reduced, and the accuracy of the insulation.
The above embodiments only express a few embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The insulation test method for the soft package lithium battery is characterized by comprising the following steps of:
step S01, cutting the edge sealed area of the soft package lithium battery to be tested to form a chamfer part, wherein the chamfer part is provided with a contact inclined plane;
step S02, performing insulation test on the soft package lithium battery to be tested, enabling a conductive adhesive block of an insulation test instrument to be in contact with the contact inclined plane, enabling a metal clamp of the insulation test instrument to clamp a negative pole tab of the soft package lithium battery to be tested, and reading an insulation resistance value displayed by the insulation test instrument;
step S03, if the insulation resistance value is larger than a preset insulation resistance value, judging that the insulation test of the soft package lithium battery to be tested is qualified; otherwise, judging that the soft package lithium battery to be tested is unqualified in insulation test.
2. The soft-package lithium battery insulation test method according to claim 1, wherein in the step S01:
before cutting a sealed edge area of a to-be-tested soft package lithium battery, measuring a total battery width value, a total battery cell width value and a total internal unsealed width value of the to-be-tested soft package lithium battery, and calculating a sealed edge width value according to the total battery width value, the total battery cell width value and the total internal unsealed width value, wherein the sealed edge width value is (the total battery width value-the total battery cell width value-the total internal unsealed width value)/2;
after the cutting operation is carried out on the edge sealing area of the soft package lithium battery to be tested, the length value of the contact inclined plane COS45 degrees is smaller than or equal to the edge sealing width value.
3. The soft-package lithium battery insulation test method according to claim 2, wherein in the step S01:
and measuring the total width value of the battery, the total width value of the battery core and the total width value of the inner non-seal of the soft package lithium battery to be tested by using a ruler.
4. The soft-package lithium battery insulation test method according to claim 1, wherein in the step S02:
before the soft package lithium battery to be tested is subjected to insulation test, the conductive rubber block of the insulation test instrument is correspondingly contacted with the contact inclined planes positioned in the edge sealing areas at two sides of the soft package lithium battery to be tested, the contact resistance value displayed by the insulation test instrument is read, and if the contact resistance value is smaller than or equal to the preset contact resistance value, the soft package lithium battery to be tested can be judged to be subjected to insulation test; otherwise, judging that the soft package lithium battery to be tested cannot be subjected to insulation test.
5. The insulation test method for the soft-package lithium battery according to claim 4, wherein the preset contact resistance value is [0M Ω, 0.05M Ω ].
6. The insulation test method for the soft-package lithium batteries according to claim 5, wherein the preset contact resistance value is 0.05M Ω.
7. The soft-package lithium battery insulation test method according to claim 1, wherein in the step S02:
and enabling a conductive rubber block of the insulation test instrument to be in contact with the contact inclined plane and completely cover the contact inclined plane.
8. The soft-package lithium battery insulation test method according to claim 7, wherein in the step S02:
before carrying out insulation test to the soft packet of lithium cell of awaiting measuring, the conductive rubber piece of processing insulation test instrument lets the conductive rubber piece of insulation test instrument form electrically conductive chamfer portion, lets electrically conductive chamfer portion with contact inclined plane contact covers completely contact inclined plane.
9. The insulation test method for the soft-package lithium batteries according to claim 1, characterized in that the preset insulation resistance value is greater than or equal to 500M Ω.
10. The insulation test method for the soft-package lithium batteries according to claim 9, wherein the preset insulation resistance value is equal to 500M Ω.
CN202010228463.9A 2020-03-27 2020-03-27 Soft package lithium battery insulation test method Pending CN111413634A (en)

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US20070249073A1 (en) * 2006-04-20 2007-10-25 Solid State Measurement, Inc. Method for determining the electrically active dopant density profile in ultra-shallow junction (USJ) structures
CN203674276U (en) * 2014-01-20 2014-06-25 东莞新能源科技有限公司 Flexible packaged lithium ion battery
CN107783052A (en) * 2016-09-26 2018-03-09 万向二三股份公司 A kind of soft bag lithium ionic cell insulation test method
CN110534831A (en) * 2019-08-12 2019-12-03 清华大学 Internal temperature of battery measurement method
CN210347690U (en) * 2019-07-31 2020-04-17 天津市捷威动力工业有限公司 Soft-package battery insulation test contact device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070249073A1 (en) * 2006-04-20 2007-10-25 Solid State Measurement, Inc. Method for determining the electrically active dopant density profile in ultra-shallow junction (USJ) structures
CN203674276U (en) * 2014-01-20 2014-06-25 东莞新能源科技有限公司 Flexible packaged lithium ion battery
CN107783052A (en) * 2016-09-26 2018-03-09 万向二三股份公司 A kind of soft bag lithium ionic cell insulation test method
CN210347690U (en) * 2019-07-31 2020-04-17 天津市捷威动力工业有限公司 Soft-package battery insulation test contact device
CN110534831A (en) * 2019-08-12 2019-12-03 清华大学 Internal temperature of battery measurement method

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Application publication date: 20200714