CN112285584A - Lithium battery cell adjusting device and cell adjusting and grouping method - Google Patents
Lithium battery cell adjusting device and cell adjusting and grouping method Download PDFInfo
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- CN112285584A CN112285584A CN202011110269.7A CN202011110269A CN112285584A CN 112285584 A CN112285584 A CN 112285584A CN 202011110269 A CN202011110269 A CN 202011110269A CN 112285584 A CN112285584 A CN 112285584A
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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
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- 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
- B07C7/00—Sorting by hand only e.g. of mail
- B07C7/04—Apparatus or accessories for hand picking
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0425—Test clips, e.g. for IC's
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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
Abstract
The invention discloses a lithium battery cell adjusting device and a cell adjusting and grouping method, wherein the lithium battery cell adjusting device comprises a lower clamping plate, an upper clamping plate, a reference adjusting device, a reference circuit, an adjusting and connecting circuit, a reference switch, an adjusting switch and a conductive pole column, wherein the reference adjusting device, the reference circuit, the adjusting and connecting circuit, the reference switch, the adjusting switch and the conductive pole column are fixed on the upper clamping plate; the reference cell, the auxiliary cell and the plurality of comparison cells are positioned between the lower clamping plate and the upper clamping plate; the method for adjusting the battery cells into groups comprises the steps of selecting reference battery cells, drawing an OCV-SOC% curve, adjusting the reference battery cells to a specified state, performing constant volume of auxiliary battery cells and comparison battery cells, eliminating auxiliary battery cells and comparison battery cells which do not meet the specification, adjusting the comparison battery cells to a specified state, performing grouped battery cell screening, and setting the battery cell use capacity to be matched and grouped. The invention improves the efficiency of cell state adjustment, reduces the investment of time and labor cost, improves the grouping efficiency of single cells, and reduces the production cost of battery modules and even battery packs.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a lithium battery cell adjusting device and a cell adjusting and grouping method.
Background
The lithium ion battery is processed into single battery cells from production to application, the single battery cells are screened and matched, grouped battery cells are welded into a module, and the module is installed for use. Monomer electricity core only can be used more extensively as the module, and from monomer electricity core to module electricity core the most important step is that the screening of carrying out monomer electricity core is supporting to be in groups. The uniformity of battery core in groups can directly influence the performance of module, if because the charge-discharge capacity difference of battery core leads to not every battery core in the module can all discharge to appointed capacity, if so can shorten the life of module greatly for a long time. Therefore, the screening of the battery cells is particularly important. In the testing process of the single battery cell, the battery cell is often required to be adjusted to the same state for comparison testing, and the traditional battery cell state adjusting method needs to adjust the state of each single battery cell according to the discharge capacity difference of each battery cell, so that the operation is time-consuming and labor-consuming. And in the aspect of electric core is in groups, individual electric core is in groups to need data such as survey capacity, voltage, internal resistance, carries out electric core screening according to certain screening principle of joining in marriage and joins in marriage the group, accords with the situation of joining in marriage the group requirement simultaneously to a plurality of parameter, often greatly reduced individual electric core's efficiency in groups, improved the battery module and even the manufacturing cost of battery package.
Disclosure of Invention
The invention aims to provide a lithium battery cell adjusting device and a cell adjusting and grouping method, which improve the cell state adjusting efficiency, reduce the time and labor cost input, improve the grouping efficiency of single cells and reduce the production cost of a battery module and even a battery pack.
The technical scheme of the invention is as follows:
a lithium battery cell adjusting device comprises a lower clamp plate, a plurality of support stand columns fixed on the lower clamp plate, an upper clamp plate supported on the support stand columns, fastening buckles fixed on the support stand columns, a buckle hook fixed at the edge of the upper clamp plate and used with each fastening buckle in a matched manner, a reference adjusting device, a reference circuit, an adjusting connecting circuit, a reference switch and an adjusting switch fixed on the upper end surface of the upper clamp plate, and two rows of conducting electrode columns fixed on the lower end surface of the upper clamp plate;
the plurality of support stand columns are positioned between the edge part of the lower clamp plate and the edge part of the upper clamp plate, a reference cell positioning groove, an auxiliary cell positioning groove and a plurality of comparison cell positioning grooves are formed in the part, positioned in the surrounding ring of the plurality of support stand columns, of the lower clamp plate, the reference cell positioning groove is used for positioning a reference cell, the auxiliary cell positioning groove is used for positioning an auxiliary cell, and each comparison cell positioning groove is used for positioning a comparison cell;
the two rows of conductive electrode columns are respectively a positive electrode conductive electrode column and a negative electrode conductive electrode column; the reference circuit is provided with two reference cell conductive nodes and two auxiliary cell conductive nodes, the reference adjusting device is connected with the two reference cell conductive nodes, a reference switch is connected between each reference cell conductive node and a corresponding auxiliary cell conductive node, the positive electrode and the negative electrode of the reference cell positioned in the reference cell positioning groove are respectively connected with a corresponding positive conductive electrode column and a corresponding negative conductive electrode column, the positive electrode and the negative electrode of the auxiliary cell positioned in the auxiliary cell positioning groove are respectively connected with the corresponding positive conductive electrode column and the corresponding negative conductive electrode column, the positive conductive electrode column and the negative conductive electrode column connected with the reference cell are respectively connected with the two reference cell conductive nodes, and the positive conductive electrode column and the negative conductive electrode column connected with the auxiliary cell are respectively connected with the two auxiliary cell conductive nodes; the adjusting connection circuit is provided with two rows of comparison cell conductive nodes which are in one-to-one correspondence from top to bottom, each row of comparison cell conductive nodes are connected in series to form a comparison cell conductive circuit, the positive electrode and the negative electrode of a comparison cell positioned in each comparison cell positioning groove are respectively connected with a corresponding positive conductive electrode column and a corresponding negative conductive electrode column, and the positive conductive electrode column and the negative conductive electrode column connected with the comparison cell are respectively connected with two corresponding comparison cell conductive nodes; and the two auxiliary electric core conductive nodes are respectively connected with the corresponding comparison electric core conductive circuits through the corresponding regulating switches.
The lower plate on be fixed with four support post, four support post are adjacent to four corners of lower plate respectively, the diameter on every support post upper portion all is less than the diameter of its lower part, the upper portion of every support post all overlaps and is equipped with the spring, the bottom of spring supports the annular step face between support post upper portion and the lower part, four corners of punch holder all be provided with the perforation, the perforation that corresponds is all passed on the upper portion of every support post, and the punch holder supports in the top of four springs.
The four supporting columns are respectively fixed with corresponding fastening buckles, each fastening buckle comprises a fixed seat fixed on the supporting column, a T-shaped rotating block hinged on the fixed seat, a handle hinged on the T-shaped rotating block and a U-shaped buckle, the end part of the vertical part of the T-shaped rotating block is hinged on the fixed seat, one end part of the horizontal part of the T-shaped rotating block is hinged with the handle, and the two end parts of the U-shaped buckle are hinged on the other end part of the horizontal part of the T-shaped rotating block; the four corners of the upper clamping plate are respectively fixed with a corresponding clamping hook, the hook groove of each clamping hook faces upwards, when the fastening clamp is connected with the corresponding clamping hook, the horizontal part of the U-shaped clamp is arranged in the hook groove of the clamping hook, and the handle drives the T-shaped rotating block to rotate downwards to clamp the U-shaped clamp on the clamping hook so as to cover the upper clamping plate tightly.
A method for adjusting and grouping lithium battery cores specifically comprises the following steps:
(1) firstly, selecting a reference cell, then drawing an OCV-SOC% curve of the reference cell, and adjusting the reference cell to a specified state of charge according to the drawn OCV-SOC% curve;
(2) the constant volume operation of the auxiliary battery cell and the comparison battery cell is carried out, the auxiliary battery cell and the comparison battery cell which do not conform to the specification are eliminated, namely the battery cell of which the battery cell capacity is lower than the discharge demand capacity is directly eliminated, one battery cell is randomly selected as the auxiliary battery cell for the battery cell of which the battery cell capacity meets the discharge demand capacity, and the other battery cells are used as the comparison battery cells;
(3) and adjusting the comparison battery cell to a specified state: firstly, placing a reference cell, an auxiliary cell and a plurality of comparison cells in a corresponding reference cell positioning groove, an auxiliary cell positioning groove and a comparison cell positioning groove, tightly covering an upper clamping plate, connecting the reference cell and the auxiliary cell with a reference circuit, and connecting the plurality of comparison cells with an adjusting and connecting circuit; firstly, a reference switch is closed, an adjusting switch is disconnected, the circuit of the reference electric core and the circuit of the auxiliary electric core are connected, and the circuit of the auxiliary electric core and the circuit of the comparison electric core are disconnected, so that the state of the auxiliary electric core is adjusted; then, after no current conduction signal exists between the auxiliary electric core and the reference electric core, the reference switch is disconnected and the adjusting switch is closed, the circuit connection between the reference electric core and the auxiliary electric core is disconnected, the circuit connection between the auxiliary electric core and the comparison electric core is connected, and the state of the comparison electric core is adjusted; when the circuit connection between the reference electric core and the auxiliary electric core is disconnected, the reference electric core is automatically connected with an external input circuit, and the reference electric core is regulated to the specified charge state again through the reference regulating device according to the drawn OCV-SOC% curve information, namely the reference electric core is selectively discharged or charged according to the relative high or low voltage; after the reference electric core is adjusted to the specified charge state again and no current conduction exists between the auxiliary electric core and the comparison electric core, the adjusting switch is switched off and the reference switch is switched on, the circuit connection between the auxiliary electric core and the comparison electric core is switched off, the circuit connection between the reference electric core and the auxiliary electric core is switched on, and the state adjustment of the auxiliary electric core is carried out again; repeating the steps, and finishing the adjustment work when the current conduction between the reference electric core and the auxiliary electric core is less than or equal to 0.1A;
(4) and screening the battery cells into groups according to the battery cell polarity data of the auxiliary battery cells and the comparison battery cells, and setting the battery cell use capacity into groups by the battery cells after the groups.
The selected reference electric core meets the condition that the discharge capacity is larger than the design demand capacity, and the electric core parameters meet the corresponding electric core specification requirements.
The method for drawing the OCV-SOC% curve of the reference cell comprises the following steps: and (4) carrying out discharge test on the reference cell, respectively discharging to different SOC%, measuring corresponding open-circuit voltage OCV, and drawing a corresponding OCV-SOC% curve.
And adjusting the reference cell to a specified state of charge according to the drawn OCV-SOC% curve, namely selecting OCV data corresponding to the specified state of charge according to the OCV-SOC% curve, and then adjusting the open-circuit voltage of the reference cell to the corresponding OCV data.
And (3) performing cell screening and grouping according to the cell polarity data of the auxiliary cells and the comparison cells by measuring cell internal resistance data of the auxiliary cells and the comparison cells after the regulation to the specified state in the step (3) and grouping the cells with similar internal resistance data into a group.
The battery cell use capacity is lower than the discharge capacity of any battery cell in the battery cells, and the battery cell use capacity is used as the battery cell use cut-off capacity.
The invention has the advantages that:
(1) the method of circuit series connection is adopted, so that the voltages among the comparison battery cell, the auxiliary battery cell and the comparison battery cell can be ensured to be consistent, and meanwhile, the battery cell can be adjusted to a specified state of charge (SOC) according to the Open Circuit Voltage (OCV) of the battery cell according to an OCV-SOC% curve;
(2) the invention adopts the arrangement of the nodes in the circuit, can simultaneously regulate the states of a plurality of battery cores, and the regulated battery core states can be ensured to be consistent, and the method is accurate and reasonable;
(3) the reference circuit and the adjusting connection circuit are separately designed, so that the adjustment of the reference cell can be carried out while the adjustment of the cell state is compared, and the time for adjusting the cell state is shortened; the parallel connection mode among the electric cores is adopted, so that the current conduction process among the electric cores can be shortened, and the energy loss of the electric cores is reduced;
(4) under the condition of ensuring the use capacity of the battery cells, the battery cells are screened only according to the internal resistance data of the battery cells after the state adjustment, so that the workload of battery cell group screening can be reduced;
(5) the use capacity of the grouped battery cells adopted by the battery module can be set as the use cut-off capacity of the battery cells, so that all the battery cells can emit the designated capacity, and the over-discharge of the monomer battery cells in the module is avoided;
(6) the screening of the grouped battery cells adopted by the invention is to adjust different battery cells to be in a consistent state for comparative screening, so that the accuracy of the grouped screening of the battery cells can be improved, and the subsequent tests of different battery cells can be carried out in a consistent state, so that different battery cells have comparability.
Compared with the traditional matching and screening method, the invention greatly reduces the time and labor cost and improves the grouping efficiency of the battery cells and the accuracy of battery cell comparison.
Drawings
Fig. 1 is a schematic structural diagram of a lithium battery cell regulating device of the present invention.
Fig. 2 is a circuit diagram of the reference circuit and the regulation connection circuit connection of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, a lithium battery cell adjusting device includes a lower clamp plate 1, four support columns 2 fixed on the lower clamp plate 1, an upper clamp plate 3 supported on the four support columns 2, fastening clips 4 fixed on each support column 2, clip hooks 5 fixed at the edge of the upper clamp plate 2 and used in cooperation with each fastening clip 4, a reference adjusting device 6, a reference circuit 7, an adjusting connection circuit 8, a reference switch 9 and an adjusting switch 10 fixed on the upper end face of the upper clamp plate 3, and two rows of conductive electrode posts 11 fixed on the lower end face of the upper clamp plate 1;
the four supporting columns 2 are respectively adjacent to four corners of the lower clamping plate 1, the diameter of the upper part of each supporting column 2 is smaller than that of the lower part of each supporting column, a spring 12 is sleeved on the upper part of each supporting column 2, the bottom end of each spring 12 abuts against an annular step surface between the upper part and the lower part of each supporting column 2, through holes are formed in four corners of the upper clamping plate 3, the upper part of each supporting column 2 penetrates through the corresponding through hole, and the upper clamping plate 3 is supported at the top ends of the four springs 12;
the four supporting columns 2 are respectively fixed with corresponding fastening buckles 4, each fastening buckle comprises a fixed seat 41 fixed on the supporting column 2, a T-shaped rotating block 42 hinged on the fixed seat 41, a handle 43 hinged on the T-shaped rotating block 42 and a U-shaped buckle 44, the end part of the vertical part of the T-shaped rotating block 42 is hinged on the fixed seat 41, one end part of the horizontal part of the T-shaped rotating block 42 is hinged with the handle 43, and the two end parts of the U-shaped buckle 44 are hinged on the other end part of the horizontal part of the T-shaped rotating block 42; corresponding clamping hooks 5 are fixed at four corners of the upper clamping plate 3, hook grooves of the clamping hooks 5 are upward, when the fastening clamp 4 is connected with the corresponding clamping hooks 5, the horizontal part of the U-shaped clamping buckle 44 is erected in the hook grooves of the clamping hooks 5, and the handle 43 drives the T-shaped rotating block 42 to rotate downwards to clamp the U-shaped clamping buckle 44 on the clamping hooks 5 so as to cover the upper clamping plate 3 tightly;
a reference cell positioning groove, an auxiliary cell positioning groove and six comparison cell positioning grooves are formed in the lower clamping plate 1, the reference cell positioning groove is used for positioning a reference cell 13, the auxiliary cell positioning groove is used for positioning an auxiliary cell 14, and each comparison cell positioning groove is used for positioning a comparison cell 15;
the two rows of conducting electrode columns 11 are respectively a positive conducting electrode column and a negative conducting electrode column; two reference cell conductive nodes 71 and two auxiliary cell conductive nodes 72 are arranged on the reference circuit 7, the reference adjusting device 6 is connected with the two reference cell conductive nodes 71, a reference switch 9 is connected between each reference cell conductive node 71 and a corresponding auxiliary cell conductive node 72, the positive electrode and the negative electrode of the reference cell 13 positioned in the reference cell positioning groove are respectively connected with the corresponding positive electrode conductive pole and the corresponding negative electrode conductive pole, the positive electrode and the negative electrode of the auxiliary cell 14 positioned in the auxiliary cell positioning groove are respectively connected with the corresponding positive electrode conductive pole and the corresponding negative electrode conductive pole, the positive conductive electrode column and the negative conductive electrode column connected with the reference cell 13 are respectively connected with two reference cell conductive nodes 71, the positive electrode conductive pole and the negative electrode conductive pole connected with the auxiliary electric core 14 are respectively connected with two auxiliary electric core conductive nodes 72;
two rows of comparison cell conductive nodes 81 are arranged on the adjusting and connecting circuit 8, the two rows of comparison cell conductive nodes 81 are in one-to-one correspondence from top to bottom, each row of comparison cell conductive nodes 81 are connected in series to form a comparison cell conductive circuit 82, the positive electrode and the negative electrode of the comparison cell 15 positioned in each comparison cell positioning groove are respectively connected with the corresponding positive electrode conductive pole and the corresponding negative electrode conductive pole, and the positive electrode conductive pole and the negative electrode conductive pole connected with the comparison cell 15 are respectively connected with the two corresponding comparison cell conductive nodes 81;
the two auxiliary cell conductive nodes 72 are connected to the corresponding comparison cell conductive circuit 82 through the corresponding adjustment switches 10.
A method for adjusting and grouping lithium battery cores specifically comprises the following steps:
(1) firstly, selecting a reference cell 13, wherein the selected reference cell 13 meets the condition that the discharge capacity is larger than the design required capacity, the cell parameters meet the corresponding cell specification requirements, then drawing an OCV-SOC% curve of the reference cell 13, and then adjusting the reference cell 13 to a specified charge state according to the drawn OCV-SOC% curve;
(2) the constant volume operation of the auxiliary battery cell 14 and the comparison battery cell 15 is carried out, the auxiliary battery cell 14 and the comparison battery cell 15 which do not conform to the specification are removed, namely, the battery cells with the battery cell capacity lower than the discharge demand capacity are directly removed, one battery cell is randomly selected as the auxiliary battery cell 14 for the battery cells with the battery cell capacity meeting the discharge demand capacity, and the other battery cells are used as the comparison battery cells 15;
(3) and adjusting the comparison battery cell 15 to a specified state: firstly, a reference cell 13, an auxiliary cell 14 and six comparison cells 15 are placed in a corresponding reference cell positioning groove, an auxiliary cell positioning groove and a comparison cell positioning groove, an upper clamping plate 3 is tightly covered, the reference cell 13 and the auxiliary cell 14 are both connected with a reference circuit 7, and the six comparison cells 15 are all connected with an adjusting and connecting circuit 8; firstly, the reference switch 9 is closed, the adjusting switch 10 is opened, the circuit of the reference cell 13 and the auxiliary cell 14 is connected, and the circuit of the auxiliary cell 14 and the circuit of the comparison cell 15 are disconnected, so that the state of the auxiliary cell 14 is adjusted; then, after no current conduction signal exists between the auxiliary cell 14 and the reference cell 13, the reference switch 9 is disconnected and the adjusting switch 10 is closed, the circuit connection between the reference cell 13 and the auxiliary cell 14 is disconnected, the circuit connection between the auxiliary cell 14 and the comparison cell 15 is connected, and the state of the comparison cell 15 is adjusted; when the circuit connection between the reference cell 13 and the auxiliary cell 14 is disconnected, the reference cell 13 is automatically connected to an external input circuit, and the reference cell 13 is adjusted to a specified state of charge again by the reference adjusting device 6 according to the plotted information of the OCV-SOC% curve, that is, the reference cell 13 is selectively discharged or charged according to the relative high or low voltage; after the reference cell 13 is adjusted to the specified state of charge again and no current is conducted between the auxiliary cell 14 and the reference cell 15, the adjusting switch 10 is opened and the reference switch 9 is closed, the circuit connection between the auxiliary cell 14 and the reference cell 15 is disconnected, the circuit connection between the reference cell 13 and the auxiliary cell 14 is connected, and the state adjustment of the auxiliary cell 14 is performed again; repeating the steps, and finishing the adjustment work when the current conduction between the reference cell 13 and the auxiliary cell 14 is less than or equal to 0.1A;
(4) and (3) measuring the internal resistance data of the battery cells of the auxiliary battery cell 14 and the comparison battery cell 15 which are adjusted to the specified state in the step (3), grouping the battery cells with similar internal resistance data into a group, setting the use capacity of the battery cells after grouping to be matched and grouped, wherein the use capacity of the battery cells is lower than the discharge capacity of any battery cell in the group of battery cells, and using the use capacity of the battery cells as the use stop capacity of the battery cells.
The method for drawing the OCV-SOC% curve of the reference cell 13 is as follows: performing a discharge test on the reference cell 13, discharging to different states of charge SOC%, measuring corresponding open-circuit voltage OCV, and drawing a corresponding OCV-SOC% curve; and adjusting the reference cell 13 to a specified state of charge according to the plotted OCV-SOC% curve, that is, firstly, selecting OCV data corresponding to the specified state of charge according to the OCV-SOC% curve, and then, adjusting the open-circuit voltage of the reference cell 13 to the corresponding OCV data.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a lithium cell electricity core adjusting device which characterized in that: the device comprises a lower clamping plate, a plurality of supporting stand columns fixed on the lower clamping plate, an upper clamping plate supported on the plurality of supporting stand columns, fastening buckles fixed on the supporting stand columns, a buckle hook fixed at the edge of the upper clamping plate and used with each fastening buckle in a matched manner, a reference adjusting device, a reference circuit, an adjusting connecting circuit, a reference switch and an adjusting switch fixed on the upper end surface of the upper clamping plate, and two rows of conducting electrode columns fixed on the lower end surface of the upper clamping plate;
the plurality of support stand columns are positioned between the edge part of the lower clamp plate and the edge part of the upper clamp plate, a reference cell positioning groove, an auxiliary cell positioning groove and a plurality of comparison cell positioning grooves are formed in the part, positioned in the surrounding ring of the plurality of support stand columns, of the lower clamp plate, the reference cell positioning groove is used for positioning a reference cell, the auxiliary cell positioning groove is used for positioning an auxiliary cell, and each comparison cell positioning groove is used for positioning a comparison cell;
the two rows of conductive electrode columns are respectively a positive electrode conductive electrode column and a negative electrode conductive electrode column; the reference circuit is provided with two reference cell conductive nodes and two auxiliary cell conductive nodes, the reference adjusting device is connected with the two reference cell conductive nodes, a reference switch is connected between each reference cell conductive node and a corresponding auxiliary cell conductive node, the positive electrode and the negative electrode of the reference cell positioned in the reference cell positioning groove are respectively connected with a corresponding positive conductive electrode column and a corresponding negative conductive electrode column, the positive electrode and the negative electrode of the auxiliary cell positioned in the auxiliary cell positioning groove are respectively connected with the corresponding positive conductive electrode column and the corresponding negative conductive electrode column, the positive conductive electrode column and the negative conductive electrode column connected with the reference cell are respectively connected with the two reference cell conductive nodes, and the positive conductive electrode column and the negative conductive electrode column connected with the auxiliary cell are respectively connected with the two auxiliary cell conductive nodes; the adjusting connection circuit is provided with two rows of comparison cell conductive nodes which are in one-to-one correspondence from top to bottom, each row of comparison cell conductive nodes are connected in series to form a comparison cell conductive circuit, the positive electrode and the negative electrode of a comparison cell positioned in each comparison cell positioning groove are respectively connected with a corresponding positive conductive electrode column and a corresponding negative conductive electrode column, and the positive conductive electrode column and the negative conductive electrode column connected with the comparison cell are respectively connected with two corresponding comparison cell conductive nodes; and the two auxiliary electric core conductive nodes are respectively connected with the corresponding comparison electric core conductive circuits through the corresponding regulating switches.
2. The lithium battery cell conditioning device of claim 1, characterized in that: the lower plate on be fixed with four support post, four support post are adjacent to four corners of lower plate respectively, the diameter on every support post upper portion all is less than the diameter of its lower part, the upper portion of every support post all overlaps and is equipped with the spring, the bottom of spring supports the annular step face between support post upper portion and the lower part, four corners of punch holder all be provided with the perforation, the perforation that corresponds is all passed on the upper portion of every support post, and the punch holder supports in the top of four springs.
3. The lithium battery cell conditioning device of claim 2, characterized in that: the four supporting columns are respectively fixed with corresponding fastening buckles, each fastening buckle comprises a fixed seat fixed on the supporting column, a T-shaped rotating block hinged on the fixed seat, a handle hinged on the T-shaped rotating block and a U-shaped buckle, the end part of the vertical part of the T-shaped rotating block is hinged on the fixed seat, one end part of the horizontal part of the T-shaped rotating block is hinged with the handle, and the two end parts of the U-shaped buckle are hinged on the other end part of the horizontal part of the T-shaped rotating block; the four corners of the upper clamping plate are respectively fixed with a corresponding clamping hook, the hook groove of each clamping hook faces upwards, when the fastening clamp is connected with the corresponding clamping hook, the horizontal part of the U-shaped clamp is arranged in the hook groove of the clamping hook, and the handle drives the T-shaped rotating block to rotate downwards to clamp the U-shaped clamp on the clamping hook so as to cover the upper clamping plate tightly.
4. The method for cell conditioning grouping by using the lithium battery cell conditioning device of claim 1, wherein: the method specifically comprises the following steps:
(1) firstly, selecting a reference cell, then drawing an OCV-SOC% curve of the reference cell, and adjusting the reference cell to a specified state of charge according to the drawn OCV-SOC% curve;
(2) the constant volume operation of the auxiliary battery cell and the comparison battery cell is carried out, the auxiliary battery cell and the comparison battery cell which do not conform to the specification are eliminated, namely the battery cell of which the battery cell capacity is lower than the discharge demand capacity is directly eliminated, one battery cell is randomly selected as the auxiliary battery cell for the battery cell of which the battery cell capacity meets the discharge demand capacity, and the other battery cells are used as the comparison battery cells;
(3) and adjusting the comparison battery cell to a specified state: firstly, placing a reference cell, an auxiliary cell and a plurality of comparison cells in a corresponding reference cell positioning groove, an auxiliary cell positioning groove and a comparison cell positioning groove, tightly covering an upper clamping plate, connecting the reference cell and the auxiliary cell with a reference circuit, and connecting the plurality of comparison cells with an adjusting and connecting circuit; firstly, a reference switch is closed, an adjusting switch is disconnected, the circuit of the reference electric core and the circuit of the auxiliary electric core are connected, and the circuit of the auxiliary electric core and the circuit of the comparison electric core are disconnected, so that the state of the auxiliary electric core is adjusted; then, after no current conduction signal exists between the auxiliary electric core and the reference electric core, the reference switch is disconnected and the adjusting switch is closed, the circuit connection between the reference electric core and the auxiliary electric core is disconnected, the circuit connection between the auxiliary electric core and the comparison electric core is connected, and the state of the comparison electric core is adjusted; when the circuit connection between the reference electric core and the auxiliary electric core is disconnected, the reference electric core is automatically connected with an external input circuit, and the reference electric core is regulated to the specified charge state again through the reference regulating device according to the drawn OCV-SOC% curve information, namely the reference electric core is selectively discharged or charged according to the relative high or low voltage; after the reference electric core is adjusted to the specified charge state again and no current conduction exists between the auxiliary electric core and the comparison electric core, the adjusting switch is switched off and the reference switch is switched on, the circuit connection between the auxiliary electric core and the comparison electric core is switched off, the circuit connection between the reference electric core and the auxiliary electric core is switched on, and the state adjustment of the auxiliary electric core is carried out again; repeating the steps, and finishing the adjustment work when the current conduction between the reference electric core and the auxiliary electric core is less than or equal to 0.1A;
(4) and screening the battery cells into groups according to the battery cell polarity data of the auxiliary battery cells and the comparison battery cells, and setting the battery cell use capacity into groups by the battery cells after the groups.
5. The method for cell conditioning grouping according to claim 4, characterized in that: the selected reference electric core meets the condition that the discharge capacity is larger than the design demand capacity, and the electric core parameters meet the corresponding electric core specification requirements.
6. The method for cell conditioning grouping according to claim 4, characterized in that: the method for drawing the OCV-SOC% curve of the reference cell comprises the following steps: and (4) carrying out discharge test on the reference cell, respectively discharging to different SOC%, measuring corresponding open-circuit voltage OCV, and drawing a corresponding OCV-SOC% curve.
7. The method for cell conditioning grouping according to claim 4, characterized in that: and adjusting the reference cell to a specified state of charge according to the drawn OCV-SOC% curve, namely selecting OCV data corresponding to the specified state of charge according to the OCV-SOC% curve, and then adjusting the open-circuit voltage of the reference cell to the corresponding OCV data.
8. The method for cell conditioning grouping according to claim 4, characterized in that: and (3) performing cell screening and grouping according to the cell polarity data of the auxiliary cells and the comparison cells by measuring cell internal resistance data of the auxiliary cells and the comparison cells after the regulation to the specified state in the step (3) and grouping the cells with similar internal resistance data into a group.
9. The method for cell conditioning grouping according to claim 4, characterized in that: the battery cell use capacity is lower than the discharge capacity of any battery cell in the battery cells, and the battery cell use capacity is used as the battery cell use cut-off capacity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011110269.7A CN112285584B (en) | 2020-10-16 | 2020-10-16 | Lithium battery cell adjusting device and cell adjusting and grouping method |
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| CN202011110269.7A CN112285584B (en) | 2020-10-16 | 2020-10-16 | Lithium battery cell adjusting device and cell adjusting and grouping method |
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