CN116165556A - Battery voltage testing and sorting system and method based on conductive shell - Google Patents

Battery voltage testing and sorting system and method based on conductive shell Download PDF

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Publication number
CN116165556A
CN116165556A CN202310175466.4A CN202310175466A CN116165556A CN 116165556 A CN116165556 A CN 116165556A CN 202310175466 A CN202310175466 A CN 202310175466A CN 116165556 A CN116165556 A CN 116165556A
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China
Prior art keywords
lithium ion
voltage
shell
ion battery
tested
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CN202310175466.4A
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Chinese (zh)
Inventor
谭壮
刘长来
夏诗忠
杨诗军
陈利娟
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Camel Energy Technology Co ltd
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Camel Energy Technology Co ltd
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Priority to CN202310175466.4A priority Critical patent/CN116165556A/en
Publication of CN116165556A publication Critical patent/CN116165556A/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]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C2301/00—Sorting according to destination
    • B07C2301/0008—Electronic Devices, e.g. keyboard, displays
    • 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

Abstract

The invention discloses a battery voltage testing and sorting system and method based on a conductive shell, wherein the system comprises: the device comprises a testing device, a wire set, a circuit switch set and a lithium ion battery to be tested; the testing device is used for detecting the shell voltage and the cell voltage of the lithium ion battery to be tested; the lead group comprises a first lead and is used for being connected with the testing device and the positive pole of the lithium ion battery to be tested to form a first current path; the second lead is used for being connected with the positive electrode probe of the testing device and the shell of the lithium ion battery to be tested to form a second current path; the third lead is used for being connected with a negative electrode probe of the testing device and a shell of the lithium ion battery to be tested to form a third current path; the fourth wire is used for connecting with a negative electrode probe of the testing device and a negative electrode column of the lithium ion battery to be tested to form a fourth current path; the circuit switch group is used for controlling the on or off of each current path. The invention realizes the purpose of conveniently testing the voltage of the lithium ion shell, thereby efficiently and rapidly sorting the batteries.

Description

Battery voltage testing and sorting system and method based on conductive shell
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a battery voltage testing and sorting system and method based on a conductive shell.
Background
The square aluminum shell lithium ion battery has the advantages of large weight specific energy, large monomer capacity, high safety and the like, and is gradually applied to the fields of electric automobiles and large-scale energy storage. Batteries based on conductive casings have lithium ions that readily alloy with aluminum at low potentials. The voltage between the cathode and the shell of the lithium ion battery based on the conductive shell is usually above 2.0V, and when the voltage is lower than 2.0V, the aluminum shell starts to generate slight electrochemical corrosion reaction; when the voltage is lower than 1.0V, the corrosion is aggravated; when the voltage is lower than 0.2V, the shell is severely corroded and lithium ions begin to be gradually embedded into the aluminum shell to form lithium aluminum alloy, the shell can be completely corroded within 1 week to 3 months, liquid leakage occurs, and safety problems are caused. Under different voltage ranges, the corrosion degree of the battery cell is different. In addition, the service life of the battery can be influenced by corrosion of the shell, and researches show that the cycle performance of the battery core with the corrosion of the shell only reaches 40% -80% of that of the normal battery core (the influence degree is different according to different corrosion degrees).
Based on the above, batteries with different types and different degrees of old and new can not be mixed, so that the situations of overcharge, overdischarge and the like caused by the mismatching of the battery capacity can be avoided, and meanwhile, the real-time sorting test of the shell voltage and the cell voltage of the aluminum-shell lithium ion battery is particularly important. At present, the battery cell is not subjected to a shell voltage (voltage between an anode/cathode and a shell) test in the battery cell sorting stage, so that the subsequent module/pack/battery cluster is scrapped due to abnormal battery cells; or the manual test is slow, the test data is recorded manually, and the efficiency is low.
Disclosure of Invention
The invention aims to overcome the technical defects, and provides a battery voltage testing and sorting system and method based on a conductive shell, which realize the purpose of conveniently testing the voltage of a lithium ion shell so as to sort batteries efficiently and rapidly.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a battery voltage test sorting system based on a conductive housing, comprising: the device comprises a testing device, a wire set, a circuit switch set and a lithium ion battery to be tested;
the testing device is used for detecting the shell voltage and the cell voltage of the lithium ion battery to be tested;
the wire set comprises a first wire, a second wire, a third wire and a fourth wire, one end of the first wire is connected with a positive electrode probe of the testing device, and the other end of the first wire is connected with a positive electrode post of the lithium ion battery to be tested to form a first current path; one end of the second wire is connected with the positive electrode probe of the testing device, and the other end of the second wire is connected with the shell of the lithium ion battery to be tested to form a second current path; one end of the third wire is connected with a negative electrode probe of the testing device, and the other end of the third wire is connected with a shell of the lithium ion battery to be tested to form a third current path; one end of the fourth wire is connected with a negative electrode probe of the testing device, and the other end of the fourth wire is connected with a negative electrode column of the lithium ion battery to be tested to form a fourth current path;
the circuit switch group is used for controlling the on or off of the first current path, the second current path, the third current path and the fourth current path.
In some embodiments, the circuit switch group includes a first relay, a second relay, a third relay, and a fourth relay;
the first relay is connected between the positive pole of the testing device and the positive pole of the lithium ion battery to be tested through the first lead and is used for switching on or switching off the first current path;
the second relay is connected between the positive pole of the testing device and the shell of the lithium ion battery to be tested through the second lead and is used for switching on or switching off the second current path;
the third relay is connected between the negative pole column of the testing device and the shell of the lithium ion battery to be tested through the third lead and is used for switching on or switching off the third current path;
the fourth relay is connected between the negative electrode column of the testing device and the negative electrode column of the lithium ion battery to be tested through the fourth lead and is used for switching on or switching off the fourth current path.
In some embodiments, the second wire and the third wire are both connected to the same location of the lithium ion battery case to be tested.
In a second aspect, the present invention further provides a battery voltage test sorting method based on a conductive housing, which is applied to the battery voltage test sorting system based on a conductive housing as described in any one of the above, and includes:
acquiring the cell voltage of a lithium ion battery to be tested and the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be tested;
determining an initial voltage state of the lithium ion battery to be tested according to the relation between the battery cell voltage and a preset battery rated voltage range;
determining the damage degree of the lithium ion battery to be tested according to the relation between the negative shell voltage of the negative electrode of the lithium ion battery to be tested and the shell and a preset shell voltage reference value;
and sorting the lithium ion batteries to be tested according to the initial voltage state and the damage degree of the lithium ion batteries to be tested.
In some embodiments, the determining the initial voltage state of the lithium ion battery to be tested according to the relationship between the cell voltage and the preset rated voltage range of the battery includes:
judging whether the battery cell voltage is in the preset battery rated voltage range or not;
if the lithium ion battery is located, the initial voltage of the lithium ion battery to be detected is in a normal state;
and if not, indicating that the initial voltage of the lithium ion battery to be detected is in an abnormal state.
In some embodiments, the determining the damage degree of the lithium ion battery to be tested according to the relationship between the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be tested and the preset shell voltage reference value includes:
judging the magnitude between the negative shell voltage and the preset shell voltage reference value;
if the current value is larger than the preset value, the lithium ion battery to be tested is not damaged;
if the voltage is smaller than the preset shell voltage damage degree interval, determining the damage degree of the lithium ion battery to be tested according to the corresponding relation between the negative shell voltage and the preset shell voltage damage degree interval.
In some embodiments, sorting the lithium ion battery to be tested according to the initial voltage state and the damage degree of the lithium ion battery to be tested includes:
dividing the initial voltage in an abnormal state and the initial voltage in a normal state into two types according to the initial voltage state;
and classifying the lithium ion batteries with the same damage degree into the same category according to the damage degree of the lithium ion batteries to be detected.
In some embodiments, the obtaining the cell voltage comprises:
opening the second and third relays to shut off the second and third current paths;
closing the first and fourth relays to communicate the first and fourth current paths;
based on the testing device, the cell voltage is determined according to the first current path and the fourth current path.
In some embodiments, the obtaining the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be measured includes:
opening the second and fourth relays to shut off the second and fourth current paths;
closing the first and third relays to communicate the first and third current paths;
based on the testing device, determining positive shell voltage of the positive electrode of the lithium ion battery to be tested and the positive shell of the shell according to the first current path and the third current path;
and determining the negative shell voltage according to the difference relation between the battery cell voltage and the positive shell voltage.
In some embodiments, the obtaining the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be tested further includes:
opening the first and third relays to shut off the first and third current paths;
closing the second and fourth relays to communicate the second and fourth current paths;
and determining the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be tested according to the second current path and the fourth current path based on the testing device.
Compared with the prior art, the battery voltage testing and sorting system and method based on the conductive shell provided by the invention have the advantages that the testing device is respectively communicated with the anode, the cathode and the shell of the lithium ion battery to be tested through the lead group, and the electric paths between the testing device and the anode, the cathode and the shell of the lithium ion battery to be tested are controlled based on the circuit switch group, so that the battery cell voltage of the lithium ion battery to be tested, the voltage between the shell and the anode and the voltage between the shell and the cathode can be obtained through accurate measurement. Therefore, whether the delivery state of the lithium ion battery is a normal state or not is judged through the obtained battery cell voltage, and the sorting of the lithium ion battery is finished through the voltage reaction of the shell and the negative electrode and the internal loss degree of the lithium ion battery, so that the internal reaction of the lithium ion battery shell is converted into the testing of the voltage of the positive electrode/the negative electrode of the battery to the shell, and the testing sorting efficiency is improved.
Drawings
FIG. 1 is a block diagram of one embodiment of a conductive housing based battery voltage test sorting system provided by the present invention;
FIG. 2 is a flow chart of an embodiment of a battery voltage test sorting method based on a conductive housing provided by the present invention;
fig. 3 is a flowchart of an embodiment of acquiring a cell voltage in step S201 in the battery voltage test sorting method based on a conductive housing according to the present invention;
FIG. 4 is a flowchart of an embodiment of the method for sorting battery voltage tests based on conductive cases according to the present invention, wherein step S201 obtains a negative case voltage;
fig. 5 is a flowchart of another embodiment of acquiring a negative case voltage in step S201 in the battery voltage test sorting method based on a conductive case according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention provides a battery voltage testing and sorting system based on a conductive shell, referring to fig. 1, comprising: the testing device 1, the lead set 2, the circuit switch set 3 and the lithium ion battery 4 to be tested;
the testing device 1 is used for detecting the shell voltage and the cell voltage of the lithium ion battery 4 to be tested;
the wire set 2 comprises a first wire 21, a second wire 22, a third wire 23 and a fourth wire 24, wherein one end of the first wire 21 is connected with the positive electrode probe of the testing device 1, and the other end of the first wire is connected with the positive electrode post of the lithium ion battery 4 to be tested to form a first current path; one end of the second wire 22 is connected to the positive electrode probe of the testing device 1, and the other end is connected to the casing of the lithium ion battery 4 to be tested, so as to form a second current path; one end of the third wire 23 is connected to the negative electrode probe of the testing device 1, and the other end is connected to the casing of the lithium ion battery 4 to be tested, so as to form a third current path; one end of the fourth wire 24 is connected to the negative electrode probe of the testing device 1, and the other end is connected to the negative electrode post of the lithium ion battery 4 to be tested, so as to form a fourth current path;
the circuit switch group 3 is used for controlling the on or off of the first current path, the second current path, the third current path and the fourth current path.
In this embodiment, the testing device is respectively connected to the positive electrode, the negative electrode and the casing of the lithium ion battery to be tested through the wire set, and the electric paths between the testing device and the positive electrode, the negative electrode and the casing of the lithium ion battery to be tested are controlled based on the circuit switch set, so that the cell voltage of the lithium ion battery to be tested, the voltage between the casing and the positive electrode and the voltage between the casing and the negative electrode can be obtained through accurate measurement. Therefore, whether the delivery state of the lithium ion battery is a normal state or not is judged through the obtained battery cell voltage, and the sorting of the lithium ion battery is finished through the voltage reaction of the shell and the negative electrode and the internal loss degree of the lithium ion battery, so that the internal reaction of the lithium ion battery shell is converted into the testing of the voltage of the positive electrode/the negative electrode of the battery to the shell, and the testing sorting efficiency is improved.
In this embodiment, the test device is an OCV device.
Furthermore, a shell voltage test phase is additionally added through the OCV equipment, the voltage between the shell and the positive/negative electrode posts of the battery cell is measured through the two-dimensional code by utilizing the shell at the two-dimensional code position of the battery cell, the upper limit and the lower limit of the numerical value of the voltage range of the shell can be set, so that the corrosion condition inside the battery cell can be judged, and the equipment exceeding the set value automatically displays and alarms; the abnormal battery cells are identified in the feeding stage.
It should be noted that, the battery with the conductive casing is a battery with a battery core wrapped by a metal casing, including an aluminum-shell aluminum ion battery, a copper-shell battery, etc., and in this embodiment, the application of the battery voltage test sorting system and method is described by taking a square aluminum-shell battery as an example.
In some embodiments, referring to fig. 1, the circuit switch group includes a first relay, a second relay, a third relay, and a fourth relay;
the first relay is connected between the positive pole of the testing device and the positive pole of the lithium ion battery to be tested through the first lead and is used for switching on or switching off the first current path;
the second relay is connected between the positive pole of the testing device and the shell of the lithium ion battery to be tested through the second lead and is used for switching on or switching off the second current path;
the third relay is connected between the negative pole column of the testing device and the shell of the lithium ion battery to be tested through the third lead and is used for switching on or switching off the third current path;
the fourth relay is connected between the negative electrode column of the testing device and the negative electrode column of the lithium ion battery to be tested through the fourth lead and is used for switching on or switching off the fourth current path.
In this embodiment, the first, second, third and fourth relays are turned on or off to turn on part of the current paths, so that the cell voltage, the voltage of the case and the negative electrode, or the voltage of the case and the positive electrode can be selectively measured.
In some embodiments, the second wire and the third wire are both connected to the same location of the lithium ion battery case to be tested.
It should be noted that, in the embodiment, the second wire and the third wire are connected to the same position of the housing, so that the problem of test error caused by the difference of voltage values at different positions of the housing can be avoided.
In a second aspect, the present invention further provides a battery voltage testing and sorting method based on a conductive housing, referring to fig. 2, applied to the battery voltage testing and sorting system based on a conductive housing as described in any one of the above, including:
s201, acquiring the cell voltage of a lithium ion battery to be tested and the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be tested;
s202, determining an initial voltage state of the lithium ion battery to be tested according to the relation between the battery cell voltage and a preset battery rated voltage range;
s203, determining the damage degree of the lithium ion battery to be tested according to the relationship between the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be tested and a preset shell voltage reference value;
s204, sorting the lithium ion batteries to be tested according to the initial voltage state and the damage degree of the lithium ion batteries to be tested.
In this embodiment, through the battery voltage test sorting system based on the conductive shell, the cell voltage of the lithium ion battery to be tested and the negative shell voltage of the negative electrode of the lithium ion battery to be tested and the negative shell voltage of the shell are rapidly and accurately obtained, then according to the relationship between the cell voltage and the preset rated voltage range of the battery, the initial voltage state of the lithium ion battery to be tested is determined, and according to the relationship between the negative shell voltage of the negative electrode of the lithium ion battery to be tested and the shell and the preset reference value of the shell voltage, the damage degree of the lithium ion battery to be tested is determined, and finally the lithium ion battery is classified according to the initial voltage state and the damage degree, so that the situations of overcharge, overdischarge and the like caused by mismatching of battery capacity are avoided.
In some embodiments, the determining the initial voltage state of the lithium ion battery to be tested according to the relationship between the cell voltage and the preset rated voltage range of the battery includes:
judging whether the battery cell voltage is in the preset battery rated voltage range or not;
if the lithium ion battery is located, the initial voltage of the lithium ion battery to be detected is in a normal state;
and if not, indicating that the initial voltage of the lithium ion battery to be detected is in an abnormal state.
In this embodiment, at the beginning of the test, a plurality of normal cells of the same batch are selected to perform a voltage test, and an average value is obtained according to the measurement result to determine the rated voltage range of the battery.
Before the cell voltage detection, the appearance sorting operation is carried out on the cells in the same batch based on the conductive shell, the appearance inspection is carried out on the cells according to the appearance inspection standard, and if the appearance is not in accordance with the requirement, the cells are directly classified into the defective products.
In some embodiments, the determining the damage degree of the lithium ion battery to be tested according to the relationship between the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be tested and the preset shell voltage reference value includes:
judging the magnitude between the negative shell voltage and the preset shell voltage reference value;
if the current value is larger than the preset value, the lithium ion battery to be tested is not damaged;
if the voltage is smaller than the preset shell voltage damage degree interval, determining the damage degree of the lithium ion battery to be tested according to the corresponding relation between the negative shell voltage and the preset shell voltage damage degree interval.
In this embodiment, the preset case voltage reference value includes a battery case voltage-internal damage degree comparison table formulated by industry standards. Specifically, when the negative shell voltage is greater than 2V, the battery cell is qualified and classified as a first grade; when the negative shell voltage is between 1 and 2V, the battery core of the lithium ion battery to be tested is corroded, and the lithium ion battery to be tested is classified into a second class; and if the negative shell voltage is lower than 1V, corroding the battery core of the lithium ion battery to be tested, and classifying the lithium ion battery to be tested into a third class.
In some embodiments, sorting the lithium ion battery to be tested according to the initial voltage state and the damage degree of the lithium ion battery to be tested includes:
dividing the initial voltage in an abnormal state and the initial voltage in a normal state into two types according to the initial voltage state;
and classifying the lithium ion batteries with the same damage degree into the same category according to the damage degree of the lithium ion batteries to be detected.
In this embodiment, the batteries in different states are classified and managed, so that the situations of overcharge, overdischarge, and the like caused by mismatching of the battery capacities can be avoided.
In some embodiments, referring to fig. 3, the acquiring the cell voltage includes:
s301, opening the second relay and the third relay to cut off the second current path and the third current path;
s302, closing the first relay and the fourth relay to communicate the first current path and the fourth current path;
s303, based on the testing device, determining the cell voltage according to the first current path and the fourth current path.
In this embodiment, the first current path and the fourth current path are conducted by the test circuit, and the cell voltage of the lithium ion battery is measured.
In some embodiments, referring to fig. 4, the obtaining the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be tested includes:
s401, opening the second relay and the fourth relay to cut off the second current path and the fourth current path;
s402, closing the first relay and the third relay to communicate the first current path and the third current path;
s403, based on the testing device, determining positive shell voltage of the positive electrode of the lithium ion battery to be tested and the positive shell of the shell according to the first current path and the third current path;
s404, determining the negative shell voltage according to the difference relation between the battery cell voltage and the positive shell voltage.
In this embodiment, the cell voltage of the lithium ion battery is equal to the sum of the negative shell voltage and the positive shell voltage, so that the negative shell voltage can be obtained through the difference relationship between the cell voltage and the positive shell voltage, thereby establishing the association relationship between the cell damage degree and the shell voltage.
In some embodiments, referring to fig. 5, the obtaining the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be tested further includes:
s501, opening the first relay and the third relay to cut off the first current path and the third current path;
s502, closing the second relay and the fourth relay to communicate the second current path and the fourth current path;
s503, based on the testing device, determining the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be tested according to the second current path and the fourth current path.
In the embodiment, the acquisition way of the negative shell voltage further comprises direct measurement and acquisition through a test sorting system, so that the purpose of efficiently and quickly acquiring the negative shell voltage is achieved.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.

Claims (10)

1. A battery voltage test sorting system based on a conductive housing, comprising: the device comprises a testing device, a wire set, a circuit switch set and a lithium ion battery to be tested;
the testing device is used for detecting the shell voltage and the cell voltage of the lithium ion battery to be tested;
the wire set comprises a first wire, a second wire, a third wire and a fourth wire, one end of the first wire is connected with a positive electrode probe of the testing device, and the other end of the first wire is connected with a positive electrode post of the lithium ion battery to be tested to form a first current path; one end of the second wire is connected with the positive electrode probe of the testing device, and the other end of the second wire is connected with the shell of the lithium ion battery to be tested to form a second current path; one end of the third wire is connected with a negative electrode probe of the testing device, and the other end of the third wire is connected with a shell of the lithium ion battery to be tested to form a third current path; one end of the fourth wire is connected with a negative electrode probe of the testing device, and the other end of the fourth wire is connected with a negative electrode column of the lithium ion battery to be tested to form a fourth current path;
the circuit switch group is used for controlling the on or off of the first current path, the second current path, the third current path and the fourth current path.
2. The conductive housing-based battery voltage test sorting system of claim 1, wherein the circuit switch set comprises a first relay, a second relay, a third relay, and a fourth relay;
the first relay is connected between the positive pole of the testing device and the positive pole of the lithium ion battery to be tested through the first lead and is used for switching on or switching off the first current path;
the second relay is connected between the positive pole of the testing device and the shell of the lithium ion battery to be tested through the second lead and is used for switching on or switching off the second current path;
the third relay is connected between the negative pole column of the testing device and the shell of the lithium ion battery to be tested through the third lead and is used for switching on or switching off the third current path;
the fourth relay is connected between the negative electrode column of the testing device and the negative electrode column of the lithium ion battery to be tested through the fourth lead and is used for switching on or switching off the fourth current path.
3. The conductive housing-based battery voltage test sorting system of claim 1, wherein the second and third wires are connected to the same location of the lithium ion battery housing under test.
4. A battery voltage test sorting method based on a conductive housing, applied to the battery voltage test sorting system based on a conductive housing as claimed in any one of claims 1 to 3, characterized in that the method comprises:
acquiring the cell voltage of a lithium ion battery to be tested and the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be tested;
determining an initial voltage state of the lithium ion battery to be tested according to the relation between the battery cell voltage and a preset battery rated voltage range;
determining the damage degree of the lithium ion battery to be tested according to the relation between the negative shell voltage of the negative electrode of the lithium ion battery to be tested and the shell and a preset shell voltage reference value;
and sorting the lithium ion batteries to be tested according to the initial voltage state and the damage degree of the lithium ion batteries to be tested.
5. The method of claim 4, wherein determining the initial voltage state of the lithium ion battery to be tested according to the relationship between the cell voltage and a preset rated voltage range of the battery comprises:
judging whether the battery cell voltage is in the preset battery rated voltage range or not;
if the lithium ion battery is located, the initial voltage of the lithium ion battery to be detected is in a normal state;
and if not, indicating that the initial voltage of the lithium ion battery to be detected is in an abnormal state.
6. The method for testing and sorting battery voltages based on conductive cases according to claim 5, wherein determining the damage degree of the lithium ion battery to be tested according to the relationship between the negative case voltage of the negative electrode and the case of the lithium ion battery to be tested and a preset case voltage reference value comprises:
judging the magnitude between the negative shell voltage and the preset shell voltage reference value;
if the current value is larger than the preset value, the lithium ion battery to be tested is not damaged;
if the voltage is smaller than the preset shell voltage damage degree interval, determining the damage degree of the lithium ion battery to be tested according to the corresponding relation between the negative shell voltage and the preset shell voltage damage degree interval.
7. The battery voltage test sorting method based on a conductive case according to claim 6, wherein sorting the lithium ion battery to be tested according to the initial voltage state and the damage degree of the lithium ion battery to be tested, comprises:
dividing the initial voltage in an abnormal state and the initial voltage in a normal state into two types according to the initial voltage state;
and classifying the lithium ion batteries with the same damage degree into the same category according to the damage degree of the lithium ion batteries to be detected.
8. The conductive housing-based battery voltage test sorting method of claim 4, wherein the acquiring the cell voltage comprises:
opening the second and third relays to shut off the second and third current paths;
closing the first and fourth relays to communicate the first and fourth current paths;
based on the testing device, the cell voltage is determined according to the first current path and the fourth current path.
9. The method for testing and sorting battery voltages based on conductive shells according to claim 8, wherein the step of obtaining the negative shell voltages of the negative electrode and the shell of the lithium ion battery to be tested comprises the steps of:
opening the second and fourth relays to shut off the second and fourth current paths;
closing the first and third relays to communicate the first and third current paths;
based on the testing device, determining positive shell voltage of the positive electrode of the lithium ion battery to be tested and the positive shell of the shell according to the first current path and the third current path;
and determining the negative shell voltage according to the difference relation between the battery cell voltage and the positive shell voltage.
10. The method for testing and sorting battery voltages based on conductive shells according to claim 8, wherein the step of obtaining the negative shell voltages of the negative electrode and the shell of the lithium ion battery to be tested further comprises:
opening the first and third relays to shut off the first and third current paths;
closing the second and fourth relays to communicate the second and fourth current paths;
and determining the negative shell voltage of the negative electrode and the shell of the lithium ion battery to be tested according to the second current path and the fourth current path based on the testing device.
CN202310175466.4A 2023-02-27 2023-02-27 Battery voltage testing and sorting system and method based on conductive shell Pending CN116165556A (en)

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