CN113093051B - Short circuit detection method of laminated lithium ion battery cell and battery cell unit rejection method - Google Patents
Short circuit detection method of laminated lithium ion battery cell and battery cell unit rejection method Download PDFInfo
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- CN113093051B CN113093051B CN202110351779.1A CN202110351779A CN113093051B CN 113093051 B CN113093051 B CN 113093051B CN 202110351779 A CN202110351779 A CN 202110351779A CN 113093051 B CN113093051 B CN 113093051B
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- 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
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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
- 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
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/361—Processing or control devices therefor, e.g. escort memory
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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
Abstract
The invention relates to a short circuit detection method and a cell unit rejection method of a laminated lithium ion cell, wherein the detection method comprises the following steps: the first probe is in conductive connection with a tab on each first pole piece in the first pole piece group; taking the second pole piece group as a target pole piece group, and performing detection operation as follows: the second probe is sequentially in conductive connection with the tabs of one part of the second pole pieces in the target pole piece group and the tabs of the other part of the second pole pieces in the target pole piece group so as to respectively perform short circuit detection on one part of the second pole pieces and the other part of the second pole pieces; and regarding the target part second pole piece with the detected short-circuit pole piece as a new target pole piece group, detecting again until the number of the detected second pole pieces in the target part second pole piece with the detected short-circuit pole piece is 1, and determining the cell unit where the second pole piece is located as the cell unit with the short circuit. Thereby find the position of taking place the short circuit, avoid abandoning the whole electricity core.
Description
Technical Field
The disclosure relates to the technical field of lithium ion batteries, in particular to a short circuit detection method and a battery cell unit rejection method for laminated lithium ion battery cells.
Background
The lamination process of the lithium ion battery is a process of combining a plurality of positive and negative pole pieces and a plurality of diaphragms into a battery cell, the yield of the lamination process directly influences the yield of the whole assembly process, the current defect mainly restricting the lamination yield is short-circuit defect, and the specific position of the short circuit cannot be quickly and effectively found, so the battery cell generating the short circuit is always subjected to waste treatment, the production yield is low, and the cost burden of an enterprise is increased.
Disclosure of Invention
The short circuit detection method can find the position of the short circuit of the lithium ion battery cell, avoid the overall abandonment of the lithium ion battery cell, improve the production yield and reduce the cost.
In order to achieve the above object, the present disclosure provides a method for detecting a short circuit of a laminated lithium ion battery cell, where the laminated lithium ion battery cell includes a plurality of battery cell units, each battery cell unit includes a first pole piece and a second pole piece with a polarity opposite to that of the first pole piece, the first pole piece in each battery cell unit constitutes a first pole piece group, and the second pole piece in each battery cell unit constitutes a second pole piece group, the method includes: a first probe of a short circuit detection device is in conductive connection with a tab on each first pole piece in the first pole piece group;
taking the second pole piece group as a target pole piece group, and carrying out the following detection operations:
a second probe of the short-circuit detection device is sequentially in conductive connection with a tab of one part of second pole piece in the target pole piece set and a tab of the other part of second pole piece in the target pole piece set so as to respectively perform short-circuit detection on the one part of second pole piece and the other part of second pole piece;
and aiming at the target part second pole piece with the detected short-circuit pole piece, taking the target part second pole piece as a new target pole piece group, carrying out the detection operation again until the number of the second pole pieces in the target part second pole piece with the detected short-circuit pole piece is 1, and determining the cell unit where the second pole piece is positioned as the cell unit with the short circuit.
Optionally, before performing the following detection operation with the second pole piece group as a target pole piece group, the method includes:
and connecting the second probe of the short-circuit detection device with a tab on each second pole piece in the second pole piece group in a conductive manner to determine that the laminated lithium ion battery cell has a short-circuited battery cell unit.
Optionally, before the electrically connecting the first probe of the short-circuit detection device with the tab on each first pole piece in the first pole piece group, the method includes:
charging the laminated lithium ion battery cell to charge each cell unit in the laminated lithium ion battery cell to a preset voltage;
the short circuit detection device can determine whether the cell unit connected with the second probe has a cell unit with a short circuit or not based on the preset voltage, the current value in the current loop and the real resistance value in the current loop.
Optionally, the determining, as the cell unit in which the short circuit occurs, the cell unit in which the second pole piece is located includes:
and under the condition that the second pole piece is an edge pole piece in the arrangement direction of the plurality of cell units, determining the second pole piece and the cell unit corresponding to the first pole piece adjacent to the second pole piece in the arrangement direction as the cell unit with short circuit.
Optionally, the determining, as the cell unit with the short circuit, the cell unit where the second pole piece is located includes:
and under the condition that the second pole piece is not an edge pole piece in the arrangement direction of the plurality of cell units, determining the second pole piece and two cell units corresponding to the first pole pieces which are adjacent to the second pole piece in front and back in the arrangement direction as the cell units with short circuit.
The present disclosure additionally provides a method for rejecting a cell unit of a laminated lithium ion cell, where the laminated lithium ion cell includes a plurality of cell units, each cell unit includes a first pole piece and a second pole piece with a polarity opposite to that of the first pole piece, the first pole piece in each cell unit forms a first pole piece group, and the second pole piece in each cell unit forms a second pole piece group, and the method includes:
a first probe of a short circuit detection device is in conductive connection with a tab on each first pole piece in the first pole piece group;
taking the second pole piece group as a target pole piece group, and carrying out the following detection operations:
a second probe of the short-circuit detection device is sequentially in conductive connection with a tab of one part of second pole piece in the target pole piece set and a tab of the other part of second pole piece in the target pole piece set so as to respectively perform short-circuit detection on the one part of second pole piece and the other part of second pole piece;
and regarding the target part second pole piece with the detected short-circuit pole piece as a new target pole piece group, performing the detection operation again until the number of the second pole pieces in the target part second pole piece with the detected short-circuit pole piece is 1, and removing the cell unit where the second pole piece is located as the cell unit with the short circuit.
Optionally, before performing the following detection operation with the second pole piece group as a target pole piece group, the method includes:
and connecting the second probe of the short-circuit detection device with a tab on each second pole piece in the second pole piece group in a conductive manner to determine that the laminated lithium ion battery cell has a short-circuited battery cell unit.
Optionally, before the electrically connecting the first probe of the short-circuit detection device with the tab on each first pole piece in the first pole piece group, the method includes:
charging the laminated lithium ion battery cell to charge each cell unit in the laminated lithium ion battery cell to a preset voltage;
the short circuit detection device can determine whether the cell unit connected with the second probe has a cell unit with a short circuit or not based on the preset voltage, the current value in the current loop and the real resistance value in the current loop.
Optionally, the rejecting the cell unit where the second pole piece is located as a cell unit with a short circuit includes:
and under the condition that the second pole piece is the edge pole piece in the arrangement direction of the plurality of cell units, the second pole piece and the cell units corresponding to the first pole pieces adjacent to the second pole piece in the arrangement direction are taken as the cell units with short circuits to be eliminated.
Optionally, the rejecting the cell unit where the second pole piece is located as a cell unit with a short circuit includes:
and under the condition that the second pole piece is not an edge pole piece in the arrangement direction of the plurality of cell units, rejecting the second pole piece and two cell units corresponding to the first pole pieces which are adjacent to the second pole piece in the front and back directions in the arrangement direction as the cell units with short circuits.
In the above technical solution, in a general way, a first probe of a short-circuit detection device is electrically connected to a tab on each first pole piece in a first pole piece group, then a plurality of second pole pieces in a second pole piece group are detected in a bisection manner until a short-circuit pole piece is detected, and finally a cell unit where the short-circuit pole piece is located is determined as a cell unit with a short circuit, so that an operator can perform operations such as maintenance on the short-circuited cell, thereby avoiding the waste of the whole cell, improving the production yield, and reducing the cost; in addition, the dichotomy mode can improve the detection efficiency and avoid the waste of detection time.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:
fig. 1 is a method for detecting a short circuit in a laminated lithium ion cell according to an embodiment of the present disclosure.
Detailed Description
The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
The invention provides a short circuit detection method of a laminated lithium ion battery cell, wherein the laminated lithium ion battery cell comprises a plurality of battery cell units, each battery cell unit comprises a first pole piece and a second pole piece with opposite polarity to the first pole piece, the first pole piece in each battery cell unit forms a first pole piece group, and the second pole piece in each battery cell unit forms a second pole piece group.
For example, the first pole piece can be a positive pole piece, the second pole piece can be a negative pole piece, and the corresponding first probe is a positive probe and the second probe is a negative probe; alternatively, the first pole piece may be a negative pole piece, the second pole piece may be a positive pole piece, and the corresponding first probe is a negative probe, and the second probe is a positive probe.
It should be noted that an insulating diaphragm is arranged between every two adjacent pole pieces in the cell unit, and when the laminated lithium ion cell is short-circuited, the insulating diaphragm between the pole pieces is broken, so that the pole pieces on both sides of the diaphragm are in conductive contact.
In addition, the above cell unit refers to: as long as include positive plate, negative pole piece and set up the insulating diaphragm between this positive plate and the negative pole piece, this three just can constitute this electric core unit.
The short circuit detection method comprises the following steps:
s11; a first probe of the short circuit detection device is in conductive connection with a tab on each first pole piece in the first pole piece group; therefore, the first probe is effectively prevented from conducting connection on the first pole piece for multiple times, and the convenience of operation is improved;
s12; taking the second pole piece group as a target pole piece group, and carrying out the following detection operations:
a second probe of the short-circuit detection device is sequentially in conductive connection with a tab of one part of second pole piece in the target pole piece set and a tab of the other part of second pole piece in the target pole piece set so as to respectively perform short-circuit detection on one part of second pole piece and the other part of second pole piece;
s13; regarding the target part second pole pieces with the short-circuit pole pieces detected, taking the target part second pole pieces as a new target pole piece group, carrying out detection operation again until the number of the second pole pieces in the target part second pole pieces with the short-circuit pole pieces detected is 1, and determining the cell unit where the second pole pieces are located as the cell unit with the short circuit;
in the technical scheme, in a general way, a first probe of a short-circuit detection device is in conductive connection with a tab on each first pole piece in a first pole piece group, then a plurality of second pole pieces in a second pole piece group are detected in a dichotomy mode until the short-circuit pole piece is detected, and finally a cell unit where the short-circuit pole piece is located is determined as a cell unit with a short circuit, so that an operator can perform operations such as maintenance and the like on the short-circuited cell, the waste of the whole cell is avoided, the production yield is improved, and the cost is reduced; in addition, the dichotomy mode can improve the detection efficiency and avoid the waste of detection time.
For example, the second pole piece group has 10 second pole pieces from top to bottom, and the second pole pieces are sequentially a1 and a2 … a10 from top to bottom, and the 10 second pole pieces are divided into two parts, one part is a1, a2, A3 and a 4; the other part is A5, A6, A7, A8, A9 and A10.
An operator can firstly connect the second probe with four tabs on four second poles of A1, A2, A3 and A4 in a conductive manner, and the short-circuit pole piece does not exist when the short-circuit detection device detects that the short-circuit pole piece does not exist; the operator connects the second probe with six tabs on six second poles a5, A6, a7, A8, a9 and a10 in a conductive manner, determines that short-circuit pole pieces exist in the six second poles after the detection of the short-circuit detection device, then uses a5 and A6 of the six second pole pieces as one part, uses a7, A8, a9 and a10 as the other part, continues to connect two tabs on two second poles a5 and A6 with the second probe in a conductive manner, and determines that short-circuit pole pieces exist after the detection of the short-circuit detection device; then, four tabs in the four second pole pieces A7, A8, A9 and A10 are in conductive connection with a second probe, and the short-circuit pole pieces are detected by a short-circuit detection device to be determined to be absent; and then, the operator performs short circuit detection on the a5 and the a6 respectively, and finally determines that the short circuit pole piece is a6, and determines that the cell unit including the a6 is the cell unit with the short circuit. Therefore, the cell unit with the short circuit in the cell can be accurately found out, an operator can maintain the short-circuited cell and the like, the abandonment of the whole cell is avoided, the production yield is improved, and the cost is reduced.
In one embodiment, before performing the following detection operations with the second pole piece group as the target pole piece group, the method includes:
and connecting a second probe of the short-circuit detection device with a tab on each second pole piece in the second pole piece group in a conductive manner to determine the short-circuited battery cell unit of the laminated lithium ion battery cell. The detection method is adopted to carry out detection under the condition that the laminated lithium ion battery cell is a normal battery cell, so that the detection time is wasted.
Optionally, before the first probe of the short-circuit detection device is conductively connected to the tab on each first pole piece in the first pole piece group, the method includes:
charging the laminated lithium ion battery cell to charge each battery cell unit in the laminated lithium ion battery cell to a preset voltage;
the short-circuit detection device can determine whether the short-circuited battery cell unit exists in the battery cell unit connected with the second probe based on preset voltage, a current value in the current loop and a real resistance value in the current loop. The determination mode is intuitive and simple.
For example, a current of 20 milliamperes is used for stamping a laminated lithium ion battery cell to 220 volts, then the voltage is kept constant at 200 volts all the time, a current attenuation value in the pressure maintaining process is detected, then the voltage is divided by the current according to ohm's law to be equal to a resistor, and under the condition that short circuit does not occur, the insulation property of an insulating membrane is good, so the current attenuation value is small, and the resistance value is large; under the condition of short circuit, the laminated lithium ion battery cell has a passage, so that the current attenuation is large, the resistance value is small, and the position where the short circuit occurs can be conveniently and simply found according to the principle.
In one embodiment, determining the cell unit in which the second pole piece is located as the cell unit in which the short circuit occurs includes:
and under the condition that the second pole piece is an edge pole piece in the arrangement direction of the plurality of cell units, determining the second pole piece and the cell unit corresponding to the first pole piece adjacent to the second pole piece in the arrangement direction as the cell unit with short circuit. That is, the cell unit with the short circuit is a second pole piece located at the edge, a first pole piece adjacent to the second pole piece, and an insulating diaphragm between the two pole pieces.
In another embodiment, determining the cell unit in which the second pole piece is located as the cell unit in which the short circuit occurs includes:
and under the condition that the second pole piece is not an edge pole piece in the arrangement direction of the plurality of cell units, determining the second pole piece and two cell units corresponding to the first pole pieces which are adjacent to the second pole piece in front and back in the arrangement direction as the cell units with short circuit. That is, in this case, the short-circuited cell unit actually includes the second pole piece detected as a short-circuited pole piece, the first insulating diaphragm located on the second pole piece, a first pole piece located on the first insulating diaphragm, the second insulating diaphragm located under the second pole piece, and a first pole piece located under the second insulating diaphragm, which are configured as the short-circuited cell unit.
The present disclosure additionally provides a method for rejecting a cell unit of a laminated lithium ion cell, where the laminated lithium ion cell includes a plurality of cell units, each cell unit includes a first pole piece and a second pole piece with a polarity opposite to that of the first pole piece, the first pole piece in each cell unit forms a first pole piece group, and the second pole piece in each cell unit forms a second pole piece group, and the method includes:
a first probe of the short circuit detection device is in conductive connection with a tab on each first pole piece in the first pole piece group;
taking the second pole piece group as a target pole piece group, and carrying out the following detection operations:
a second probe of the short-circuit detection device is sequentially in conductive connection with a tab of one part of second pole piece in the target pole piece set and a tab of the other part of second pole piece in the target pole piece set so as to respectively perform short-circuit detection on one part of second pole piece and the other part of second pole piece;
and regarding the target part second pole piece with the detected short-circuit pole piece as a new target pole piece group, carrying out detection operation again until the number of the second pole pieces in the target part second pole piece with the detected short-circuit pole piece is 1, and removing the cell unit where the second pole piece is located as the cell unit with the short circuit.
In the technical scheme, for the purpose of reusing the cell units which are not short-circuited in the laminated lithium ion cell with the short circuit, the inventor rejects the cell unit where the second pole piece with the short circuit is located, and reserves the cell units which are not short-circuited for reuse, so that the recycling of the undamaged pole pieces and the insulating diaphragms in the laminated lithium ion cell with the short circuit is improved, the yield is improved, and the cost is reduced.
Before the second pole piece group is taken as a target pole piece group, the following detection operations are carried out, including:
and connecting a second probe of the short-circuit detection device with a tab on each second pole piece in the second pole piece group in a conductive manner to determine the short-circuited battery cell unit of the laminated lithium ion battery cell. The detection method is adopted to detect the laminated lithium ion battery cell under the condition that the laminated lithium ion battery cell is a normal battery cell, so that the detection time is wasted, and the rejection efficiency is improved.
Before the first probe of the short circuit detection device is conductively connected with the tab on each first pole piece in the first pole piece group, the short circuit detection device comprises:
charging the laminated lithium ion battery cell to charge each battery cell unit in the laminated lithium ion battery cell to a preset voltage;
the short circuit detection device can determine whether the short-circuited battery cell unit exists in the battery cell unit connected with the second probe based on preset voltage, a current value in the current loop and a real resistance value in the current loop, and according to the method, the position where the short circuit occurs can be conveniently and simply found, and the rejection efficiency is improved.
Optionally, rejecting the cell unit where the second pole piece is located as a cell unit with a short circuit, includes:
under the condition that the second pole pieces are edge pole pieces in the arrangement direction of the battery cell units, the second pole pieces and the battery cell units corresponding to the first pole pieces adjacent to the second pole pieces in the arrangement direction are taken as the battery cell units with short circuits to be eliminated.
In other embodiments, rejecting the cell unit in which the second pole piece is located as a cell unit in which a short circuit occurs includes:
and under the condition that the second pole piece is not an edge pole piece in the arrangement direction of the plurality of cell units, rejecting the second pole piece and two cell units corresponding to the first pole pieces which are adjacent to the second pole piece in the front and back directions in the arrangement direction as the cell units with short circuits.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (4)
1. A method for detecting a short circuit of a laminated lithium ion battery cell, wherein the laminated lithium ion battery cell comprises a plurality of battery cell units, each battery cell unit comprises a first pole piece and a second pole piece with a polarity opposite to that of the first pole piece, the first pole piece in each battery cell unit forms a first pole piece group, the second pole piece in each battery cell unit forms a second pole piece group, and the method comprises:
a first probe of a short circuit detection device is in conductive connection with a tab on each first pole piece in the first pole piece group;
taking the second pole piece group as a target pole piece group, and carrying out the following detection operations:
the second probe of the short-circuit detection device is sequentially in conductive connection with the tabs of one part of second pole pieces in the target pole piece set and the tabs of the other part of second pole pieces in the target pole piece set so as to respectively carry out short-circuit detection on one part of second pole pieces and the other part of second pole pieces;
for the target part second pole piece with the detected short-circuit pole piece, taking the target part second pole piece as a new target pole piece group, carrying out the detection operation again until the number of the second pole pieces in the target part second pole piece with the detected short-circuit pole piece is 1, and determining the cell unit where the second pole piece is located as the cell unit with the short circuit;
before the step of conductively connecting the first probe of the short circuit detection device with the tab on each first pole piece in the first pole piece group, the method comprises the following steps:
charging the laminated lithium ion battery cell to charge each battery cell unit in the laminated lithium ion battery cell to a preset voltage;
the short-circuit detection device can determine whether the cell unit connected with the second probe has a cell unit with a short circuit or not based on the preset voltage, the current value in the current loop and the real resistance value in the current loop;
the determining of the cell unit where the second pole piece is located as the cell unit with the short circuit includes:
determining the second pole piece and the cell unit corresponding to the first pole piece adjacent to the second pole piece in the arrangement direction as a short-circuited cell unit under the condition that the second pole piece is an edge pole piece in the arrangement direction of the plurality of cell units;
the determining of the cell unit where the second pole piece is located as the cell unit with the short circuit includes:
and under the condition that the second pole piece is not an edge pole piece in the arrangement direction of the plurality of cell units, determining the second pole piece and two cell units corresponding to the first pole pieces which are adjacent to the second pole piece in front and back in the arrangement direction as the cell units with short circuit.
2. The method according to claim 1, wherein before said taking said second slice group as a target slice group, performing the following detection operations, comprising:
and connecting the second probe of the short-circuit detection device with a tab on each second pole piece in the second pole piece group in a conductive manner to determine that the laminated lithium ion battery cell has a short-circuited battery cell unit.
3. A method for rejecting cell units of a laminated lithium ion cell is characterized in that the laminated lithium ion cell comprises a plurality of cell units, each cell unit comprises a first pole piece and a second pole piece with opposite polarity to the first pole piece, the first pole piece in each cell unit forms a first pole piece group, and the second pole piece in each cell unit forms a second pole piece group, and the method comprises the following steps:
a first probe of a short circuit detection device is in conductive connection with a tab on each first pole piece in the first pole piece group;
taking the second pole piece group as a target pole piece group, and carrying out the following detection operations:
a second probe of the short-circuit detection device is sequentially in conductive connection with a tab of one part of second pole piece in the target pole piece set and a tab of the other part of second pole piece in the target pole piece set so as to respectively perform short-circuit detection on the one part of second pole piece and the other part of second pole piece;
regarding a target part second pole piece with a detected short-circuit pole piece, taking the target part second pole piece as a new target pole piece group, carrying out the detection operation again until the number of the second pole pieces in the target part second pole piece with the detected short-circuit pole piece is 1, and taking the cell unit where the second pole piece is located as a cell unit with a short circuit to remove;
before the step of conductively connecting the first probe of the short circuit detection device with the tab on each first pole piece in the first pole piece group, the method comprises the following steps:
charging the laminated lithium ion battery cell to charge each battery cell unit in the laminated lithium ion battery cell to a preset voltage;
the short-circuit detection device can determine whether the cell unit connected with the second probe has a cell unit with a short circuit or not based on the preset voltage, the current value in the current loop and the real resistance value in the current loop;
rejecting the cell unit where the second pole piece is as a cell unit with short circuit, and the rejecting method comprises the following steps:
under the condition that the second pole piece is an edge pole piece in the arrangement direction of the plurality of cell units, the second pole piece and the cell unit corresponding to the first pole piece adjacent to the second pole piece in the arrangement direction are taken as the cell units with short circuits to be removed;
rejecting the cell unit where the second pole piece is as a cell unit with short circuit, and the rejecting method comprises the following steps:
and under the condition that the second pole piece is not an edge pole piece in the arrangement direction of the plurality of cell units, rejecting the second pole piece and two cell units corresponding to the first pole pieces which are adjacent to the second pole piece in the front and back directions in the arrangement direction as the cell units with short circuits.
4. The method according to claim 3, wherein before said taking said second slice group as a target slice group, performing the following detection operations, comprising:
and connecting the second probe of the short-circuit detection device with a tab on each second pole piece in the second pole piece group in a conductive manner to determine that the laminated lithium ion battery cell has a short-circuited battery cell unit.
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| DE10207070A1 (en) * | 2002-02-20 | 2003-08-28 | Varta Microbattery Gmbh | Process for the production of galvanic elements |
| JP2016062728A (en) * | 2014-09-17 | 2016-04-25 | 株式会社豊田自動織機 | Method and device for detecting foreign matter of electrode assembly |
| KR102395248B1 (en) * | 2018-08-09 | 2022-05-04 | 주식회사 엘지에너지솔루션 | Apparatus for detecting a defect of battery separator and Detecting method using the same |
| CN111381182B (en) * | 2018-12-27 | 2021-01-26 | 广州汽车集团股份有限公司 | Battery cell short circuit detection clamp, device and detection method |
| CN109921084A (en) * | 2019-03-11 | 2019-06-21 | 无锡先导智能装备股份有限公司 | Laminating method and laminating equipment |
| CN111430774A (en) * | 2020-04-30 | 2020-07-17 | 蜂巢能源科技有限公司 | Rapid lamination method and lamination tool for battery cell pole group and battery cell pole group |
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2021
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