JP5490667B2 - Secondary battery cell and secondary battery cell manufacturing apparatus - Google Patents

Description

The present invention relates to a secondary battery cell having identification information display and a secondary battery cell manufacturing apparatus.

  Secondary battery cells such as lithium ion secondary battery cells, nickel hydride secondary battery cells, and nickel cadmium secondary battery cells have been rapidly spreading in recent years as power sources for hybrid vehicles and electric vehicles. Secondary battery cells for automobiles require high energy density and high battery performance with little variation. For this reason, in the manufacturing stage, the necessity of recording manufacturing information in each secondary battery cell to speed up the maintenance management and the cause investigation when a failure occurs, that is, the establishment of good traceability has been studied.

  As a method of recording manufacturing information in the secondary battery cell, an external negative electrode terminal is provided on one side surface of the rectangular case, and the manufacturing number information such as the manufacturing date and line number is provided on the upper surface of the entire area except the external negative electrode terminal portion Is known by ink jet or laser marking (see, for example, Patent Document 1: Paragraph [0037]).

JP 2010-73581 A

For example, if the battery performance after aging is measured on the secondary battery cell while reading the manufacturing number information of each secondary battery cell, the traceability is further improved. In order to record such identification information in the secondary battery cell, if the manufacturing number information can be read in a state where the probe is connected to the electrode terminal, workability is improved.
However, in the secondary battery cell disclosed in Patent Document 1, the serial number information is recorded on the upper surface of the case, and the external negative electrode terminal is provided on the side surface. For this reason, it is difficult to connect the probe to the electrode terminal in a state where the serial number information can be read, and the efficiency is poor.

The secondary battery cell of the present invention includes an electrode group in which a positive electrode and a negative electrode are overlapped via a separator, a lid member on which an external positive electrode terminal and an external negative electrode terminal to which the positive electrode and the negative electrode are connected are disposed. And at least one of manufacturing information and battery performance information on the upper surface of the lid member. An identification information display unit on which identification information to be displayed is displayed is formed.
Further, the secondary battery device of the present invention is characterized in that a plurality of the secondary battery cells described above obtained by reading, selecting and combining the identification information displayed on the identification information display unit are assembled.

  The production apparatus of the present invention includes a container in which an electrode group having a positive electrode and a negative electrode is accommodated and in which an electrolytic solution is injected, an external positive terminal connected to the positive electrode of the electrode group, and an external negative electrode connected to the negative electrode And a positive electrode and a negative electrode connected to the external positive electrode terminal and the external negative electrode terminal, respectively, having a terminal and a lid member having an identification information display portion formed on the upper surface. And a reader for reading the identification information of the lid member, a reading device in which the tips of the positive and negative probes and the reading surface of the reader are integrated in the same direction, and the positive and negative electrodes A charge / discharge circuit that is connected to the probe for charging and discharging the secondary battery cell, and an inspection circuit that measures the battery performance of the secondary battery cell after a predetermined time of charge / discharge by the charge / discharge circuit. To do.

  According to the present invention, since the external positive electrode terminal, the external negative electrode terminal, and the identification information display unit are displayed on the lid member, the work of reading the information on the identification information display unit can be efficiently performed with the probe connected to the electrode terminal. Can be performed.

The external appearance perspective view of one embodiment of the secondary battery cell of the present invention. The perspective view of the state which removed a part of battery container in FIG. FIG. 2 is an exploded perspective view of the secondary battery cell illustrated in FIG. 1. FIG. 2 is a perspective view illustrating a structure of an electrode group illustrated in FIG. 1. The processing flowchart which shows one Embodiment of the manufacturing method of the secondary battery cell illustrated by FIG. The perspective view for demonstrating the method of forming identification information in a battery cover. The perspective view for demonstrating the method of reading the recording information of components and forming identification information in a cover member. The perspective view which shows the method of the charging / discharging test | inspection of a secondary battery cell. The perspective view which shows the method of forming the identification information regarding battery performance in a secondary battery cell. The perspective view of Embodiment 1 of the secondary battery apparatus of this invention. The perspective view of Embodiment 2 of the secondary battery apparatus of this invention. The perspective view which shows the other example of the method of forming identification information in a secondary battery cell.

--Embodiment 1--
(Secondary battery cell)
Hereinafter, a secondary battery cell and a secondary battery cell manufacturing apparatus of the present invention will be described with reference to the drawings.
[Secondary battery cell structure]
First, the secondary battery cell will be described. FIG. 1 is an external perspective view showing an embodiment of a secondary battery cell of the present invention, FIG. 2 is a perspective view of a state where a part of the battery container in FIG. 1 is removed, and FIG. FIG. 2 is an exploded perspective view of FIG. 1.
The secondary battery cell 10 is a square lithium ion secondary battery, for example, and has a flat rectangular parallelepiped shape as a whole. The secondary battery cell 10 is a battery that covers a rectangular plane and back surface of a large area, a battery container 11 having three side surfaces disposed between the plane and the back surface, and a rectangular opening at the top of the battery container 11. A lid unit 3 is provided. A wound group 50 is housed inside the battery container 11. The battery lid unit 3 includes a battery lid (lid member) 30, a positive electrode connection bolt 31, an external positive electrode terminal 32, an external positive electrode terminal plate 37, an insulating plate 36, a positive electrode current collector plate 33, a negative electrode connection bolt 41, an external negative electrode terminal 42, An external negative electrode terminal plate 47, an insulating plate 46, and a negative electrode current collector plate 43 are included. The battery lid 30 is formed of a metal material such as aluminum and is sealed to the battery container 11 by laser welding. Electric power is supplied to the external load through the external positive terminal 32 and the external negative terminal 42, or external generated power is charged to the wound group 50 through the external positive terminal 32 and the external negative terminal 42.

The positive connection bolt 31 and the external positive terminal 32 are electrically connected by an external positive terminal plate 37 formed of a conductive member. An insulating plate 36 made of a resin member is interposed between the external positive terminal plate 37 and the battery lid 30, and the external positive terminal plate 37 and the battery lid 30 are insulated.
The negative electrode connection bolt 41 and the external negative electrode terminal 42 are electrically connected by an external negative electrode terminal plate 47 formed of a conductive member. An insulating plate 46 made of a resin member is interposed between the external negative terminal plate 47 and the battery cover 30, and the external negative terminal plate 47 and the battery cover 30 are insulated.

  The external positive terminal plate 37 and the external negative terminal plate 47 are arranged apart from each other in the length direction of the battery case 11. Between the external positive electrode terminal plate 37 and the external negative electrode terminal plate 47 in the battery lid 30, a cleavage valve 12 and a liquid injection part 13 for injecting an electrolytic solution are provided. The cleavage valve 12 functions as a pressure reducing mechanism that ejects a gas generated inside the battery container 11, that is, a mist-like gas containing an electrolytic solution, to the outside of the battery container 11. The cleavage valve 12 is configured by providing the battery cover 30 with a circular groove and a plurality of radial grooves extending from the center of the circular groove to a circular groove. The liquid injection part 13 is an opening for injecting the electrolytic solution into the battery container 11, and is closed by a sealing plug after the liquid injection.

A positive current collector plate 33 is connected to the external positive terminal plate 37 (see FIG. 3). The positive electrode current collector plate 33 is made of a metal plate and has a pair of connection portions 33 a having flexibility in the thickness direction of the wound group 50. The pair of connection portions 33a are provided apart from each other in the thickness direction of the winding group 50, and each connection portion 33a is connected to a positive electrode current collector (described later in FIG. 4) arranged on one side edge side of the winding group 50. The positive electrode mixture untreated portion) 51c is connected by pressure contact from the opposite surface side.
A negative electrode current collector plate 43 is connected to the external negative electrode terminal plate 47 (see FIG. 3). The negative electrode current collector plate 43 is made of a metal plate and has a pair of connection portions 43 a having flexibility in the thickness direction of the wound group 50. The pair of connection portions 43a are provided apart from each other in the thickness direction of the wound group 50, and are disposed on the other side edge of the wound group 50 (a negative electrode mixture untreated portion in FIG. 4 to be described later). ) 52c is connected by pressure contact from opposite surfaces.

FIG. 4 is a perspective view of the winding group 50 with the winding end side opened.
The wound group 50 is formed by winding the positive electrode 51 and the negative electrode 52 in a flat shape with the first and second separators 53 and 54 interposed therebetween.
The positive electrode 51 is obtained by, for example, coating a positive electrode mixture layer 51b on both surfaces of a positive electrode sheet 51a made of aluminum foil or the like. The positive electrode mixture layer 51b is coated on one side edge so as to form a positive electrode mixture untreated portion 51c where the positive electrode sheet 51a is exposed.
The negative electrode 52 is obtained by, for example, coating a negative electrode mixture layer 52b on both surfaces of a negative electrode sheet 52a made of copper foil or the like. In the negative electrode mixture layer 52b, the negative electrode mixture untreated portion 51c in which the negative electrode sheet 52a is exposed is formed on the other side edge that is the side edge opposite to the side edge where the positive electrode mixture untreated portion 51c is disposed. So that it is coated.

The positive electrode mixture 51b is prepared by adding 10 parts by weight of flaky graphite as a conductive material and 10 parts by weight of PVDF as a binder to 100 parts by weight of lithium manganate (chemical formula LiMn ₂ O ₄ ) as a positive electrode active material. This is prepared by adding and kneading NMP as a dispersion solvent. This positive electrode mixture 51b is applied to both surfaces of an aluminum foil having a thickness of 20 μm, leaving the positive electrode mixture untreated portions 51c. Thereafter, drying, pressing, and cutting are performed to obtain a positive electrode 51 having a thickness of 90 μm in a positive electrode active material application portion that does not include an aluminum foil.

  The negative electrode mixture 52b is prepared by adding 10 parts by weight of polyvinylidene fluoride (hereinafter referred to as PVDF) as a binder to 100 parts by weight of amorphous carbon powder as a negative electrode active material, and adding N as a dispersion solvent thereto. -Methyl bilolidon (hereinafter referred to as NMP) is added and kneaded. This negative electrode mixture 52b is applied to both surfaces of a 10 μm thick copper foil leaving the negative electrode mixture untreated portions 52c. Thereafter, drying, pressing, and cutting are performed to obtain a negative electrode 52 having a thickness of 70 μm and having a negative electrode active material application portion that does not include a copper foil.

  In order to form the wound group 50, the winding start side end of the negative electrode 52 is placed inside the winding start side end of the positive electrode 51 between the first and second separators 53 and 54, respectively. Position and wind. In this case, the positive electrode mixture untreated portion 51c and the negative electrode mixture untreated portion 52 are arranged so as to be positioned on the opposite side edges. The width of the negative electrode mixture layer 52b, in other words, the length in the direction orthogonal to the winding direction is formed wider than the width of the positive electrode mixture layer 51b. Further, as shown in FIG. 4, the width of the first separator 53 is such that the positive electrode mixture untreated portion 51 c of the positive electrode 51 is exposed to the outside on one side edge side. The width of the second separator 54 is such that the negative electrode mixture untreated portion 52c of the negative electrode 52 is exposed to the outside on the other side edge side.

On the winding start side of the winding group 50, the first and second separators 53 and 54 are wound several times. Further, on the winding end side of the winding group 50, the outermost periphery is the second separator 54, and the inner side thereof is the electrode negative electrode 52. Therefore, the positive electrode mixture layer 51b is covered with the negative electrode mixture layer 52b over the entire length from the winding start side to the winding end side even in the width direction.
The reason for this structure is that in the case of a lithium ion secondary battery, lithium as the positive electrode active material is ionized and penetrates the separator, but the negative electrode active material is not formed on the negative electrode side and the negative electrode sheet 52a is exposed. This is because lithium is deposited on the negative electrode sheet 52a and causes an internal short circuit.

Referring to FIG. 3, winding group 50 has positive electrode 51 in which positive electrode mixture untreated portion 51 c of positive electrode sheet 51 a is exposed to the outside, and negative electrode 52 has a negative electrode combination of negative electrode sheet 52 a. The agent unprocessed portion 52c is exposed to the outside.
The distance between the pair of connection portions 33a of the positive electrode current collector plate 33 and the distance between the pair of connection portions 43a of the negative electrode current collector plate 43 are the thicknesses of the stacked positive electrode mixture untreated portions 51c of the wound group 50, respectively. It is slightly smaller than the thickness in which the negative electrode mixture untreated portion 52c of the wound group 50 is laminated. Therefore, the positive electrode mixture untreated portion 51 c of the wound group 50 is interposed between the pair of connection portions 33 a of the positive electrode current collector plate 33, and the wound group is interposed between the pair of connection portions 43 a of the negative electrode current collector plate 43. When the negative electrode mixture untreated portion 52 c of 50 is inserted, the positive electrode 51 is connected to the positive current collector 33 and the negative electrode 52 is connected to the negative current collector 43.

With this assembly, the positive electrode mixture untreated portion 51 c of the wound group 50 is pressed by the pair of connection portions 33 a of the positive electrode current collector plate 33, and the external positive electrode terminal 32 is connected to the positive electrode 51. Further, the negative electrode mixture untreated portion 52 c of the wound group 50 is pressed by the pair of connection portions 43 a of the negative electrode current collector plate 43, and the external negative electrode terminal 42 is connected to the negative electrode 52.
The laminated portion of the positive electrode mixture untreated portion 51c and the positive electrode connection 33a are electrically connected by ultrasonic welding or resistance welding. The same applies to the negative electrode 52. When connecting, after crushing the laminated part of the positive / negative electrode mixture untreated parts 51c, 52c in the thickness direction, the positive / negative electrode connecting parts 33a, 43a are welded.

  On the upper surface of the battery lid 30, three identification information display portions 26 to 28 on which different identification information is displayed are formed. The first identification information display unit 26 displays the serial number of the battery lid 30. The production number includes a number / symbol for confirming the factory, the line, and the production date where the battery cover 30 was produced. In the second identification information display unit 27, a manufacturing information number directly or indirectly related to the manufacturing number of the wound group 50 is displayed. This manufacturing information number includes a number / symbol that allows confirmation of the factory, line, and date of manufacture of the wound group 50. The third identification information display unit 28 displays information indicating battery performance. The information indicating the battery performance is, for example, the voltage value and internal resistance value of the secondary battery cell after aging.

  The first to third identification information display units 26, 27, and 28 are arranged in a line in the width direction of the battery lid 30. The first and second identification information display units 26 and 27 are disposed between the cleavage valve 12 and the external positive electrode terminal 32 that are disposed substantially at the center of the battery lid 30. The third identification information display unit 28 is disposed between the liquid injection unit 13 and the external negative electrode terminal 42 that are disposed substantially at the center of the battery lid 30. As will be described later, the third identification information display unit 28 has a lot of information regarding battery performance such as a voltage value and an internal resistance value, and is larger than the first and second identification information display units 26 and 27. Dimension is formed. Each identification information can be formed by a one-dimensional barcode or a two-dimensional data matrix code. Alternatively, a QR code (registered commercial law) can be used.

  As illustrated in FIG. 3, the wound group 50 accommodated in the battery container 11 includes a fourth identification information display unit on which manufacturing information of the wound group 50 is displayed. The fourth identification information display unit 25 is a serial number that allows confirmation of the factory, line, and manufacturing date in which the wound group 50 is manufactured, and is provided near the end of the fourth separator 54 at the winding end side. The characteristics of the wound group 50 are important factors that directly affect the battery performance. Therefore, as described above, the second identification information display unit 27 on which the manufacturing information number directly or indirectly related to the manufacturing number of the wound group 50 is provided on the upper surface of the battery cover 30 is disassembled. It can be confirmed from the outside.

The identification information displayed on each identification information display unit 25 to 28 is recorded in a different manufacturing process, and has unique and valuable information.
Hereinafter, with reference to FIG. 5, an embodiment of a method for manufacturing the secondary battery cell 10 illustrated in FIGS. 1 to 3 will be described.

[Method for producing secondary battery cell]
First, in the electrode group manufacturing process, the wound group 50 is manufactured (step S1). The method for producing the wound group 50 is as described above. If step S1 is completed, the 4th identification information display part 25 will be formed in the winding group 50 in step S2.
In the fourth identification information display section 25, as described above, a manufacturing number that can confirm the factory, line, and manufacturing date in which the wound group 50 is manufactured is recorded. The manufacturing number of the wound group 50 is directly recorded in the wound group 50 by, for example, laser printing that irradiates a laser or ink jet printing.

In parallel with the electrode group production process, the battery lid unit 3 is produced in the battery lid production process.
In step S11, the battery cover 30 is produced.
If step S11 is completed, the 1st identification information display part 26 will be formed in the battery cover 30 by step S12.
FIG. 6 is a diagram illustrating a method of forming the first identification information display unit 26.
As described above, in the first identification information display unit 26, the factory, the line, and the manufacturing date where the battery cover 30 is manufactured are recorded. A metal plate such as aluminum, which is a material for forming the battery lid 30, is irradiated with a laser by the laser marker 91, and the serial number of the battery lid 30 is printed directly. The serial number is converted into a two-dimensional data matrix and recorded. The surface of the battery cover 30 to be recorded is the same surface as the surface on which the external positive terminal 32, the external negative terminal 42, and the like are provided. When the metal plate is aluminum, the laser output needs to be 5 W or more. The wavelength of the laser is, for example, 1060 nm, but is not limited to this wavelength.

  The surface of the aluminum metal plate is usually large in unevenness, and it is difficult to read it correctly when it is read by the reader after the identification information is formed. Therefore, it is desirable to perform the background processing by scanning the laser in a region where the first identification information display unit 26 is formed in advance. The ground processing can be performed by a laser marker 91 that prints identification information.

  The material of the battery lid 30 is not limited to an aluminum metal plate, and may be a thin plate that can be sealed, such as a SUS steel plate or a resin plate. When printing on a resin plate with a laser, information is displayed by coloring the resin by local heating with a laser, so the laser output may be about 1 W.

In the present embodiment, the manufacturing number of the battery lid 30 is printed on the upper surface of the battery lid 30 in step S12 which is the first step after the battery lid 30 is manufactured. For this reason, as will be described below by reading this serial number with a reading device, how to process the battery lid 30 serving as the base of the battery lid assembly processing step in the assembly process after printing, or the battery lid 30 As a result, it is possible to check the state of assembly and processing, such as which lot of members are assembled, and management becomes easy. In FIG. 6, the production number of the battery cover 30 is printed before the battery cover 30 is processed. In this state, the cleavage valve 2 and the liquid injection part 13 are not formed. However, the production number of the battery lid 30 may be printed in a process after one or both of the cleavage valve 2 and the liquid injection part 13 are formed.
The production number can be printed on the battery cover 30 during the assembly of the battery cover 30 or after the assembly of the battery cover 30 is completed. However, in this case, it is difficult to manage the battery cover that is in the process of being assembled and removed from the line due to a defect or the like in the process before the production number is printed.

If step S12 is completed, the member for comprising the battery cover unit 3 will be assembled | attached to the battery cover 30 one by one. That is, as described above, the external positive terminal 32, the positive connection bolt 31, the insulating plate 36, and the positive current collector 33 integrated with the positive connection plate 37 are assembled to the battery lid 30 to provide the positive connection structure portion. Also, the external negative terminal 42, the negative connection bolt 41, the insulating plate 46, and the negative current collector 43 integrated with the negative connection plate 47 are assembled to the battery lid 30 to provide the negative connection structure portion.
In this way, step S13 for producing the battery lid unit 3 is completed.

When step S13 is completed, the secondary battery cell 10 is assembled in the battery cell assembly process.
In step S21, the battery container 11 is produced.
Next, using the produced battery container 11, a battery cell into which the electrolyte is not injected is produced in step S22.
For this, first, the battery lid unit 3 is connected to the wound group 50 in which the fourth identification information display section 25 is formed in step S2. In this connection, as described above, the positive electrode mixture untreated portion 51 c of the wound group 50 is connected between the pair of connection portions 33 a of the positive electrode current collector plate 33, and the pair of connection portions 43 a of the negative electrode current collector plate 43 is connected. It is performed by inserting and welding the negative electrode mixture untreated portion 52c of the wound group 50 in between.

Then, the battery lid unit 3 and the wound group 50 are accommodated in the battery container 11 in a state where the battery lid unit 3 and the wound group 50 are connected as described above. Then, the battery lid 30 and the battery container 11 are welded by laser. Thereby, preparation of the battery cell of step S22 is completed.
If step S22 is completed, the 2nd identification information display part 27 will be formed in the battery cover 30 in step S23. As described above, the second identification information display unit 27 displays a manufacturing information number directly or indirectly related to the manufacturing number of the wound group 50.

FIG. 7 is a diagram illustrating a method of forming the second identification information display unit 27 on the battery lid 30.
First, the serial number of the wound group 50 displayed on the fourth identification information display unit 25 of the wound group 50 is read by a two-dimensional reader (reading device) 73. Information read by the reader 73 is transmitted to the laser marker 92. Then, the data is converted into a data matrix as a battery cell production number, and printing is performed by irradiating the upper surface of the battery lid 30 with the laser marker 92 as it is. In the case where the battery cover 30 is an aluminum metal plate, it is desirable to perform the ground treatment by previously irradiating a laser on the area to be printed as described above.

As described above, the characteristics of the winding group 50 are important elements that directly affect the battery performance. Therefore, the battery lid 30 can be confirmed on the upper surface of the battery lid 30 so that the manufacturing information number of the winding group 50 can be confirmed from the outside. Is displayed on the second identification information display unit 27.
The identification information recorded in the second identification information display unit 27 is preferably the same as the manufacturing number recorded in the fourth identification information display unit 25. In this case, the manufacturing number of the fourth identification information display unit 25 may not be the same as the manufacturing number of the fourth identification information display unit 25, or may be a number / symbol associated with the manufacturing number of the fourth identification information display unit 25. Here, an electrode group manufacturing information number including a number / symbol that is the same as or associated with the manufacturing number is referred to as an electrode group manufacturing information number. Since the manufacturing number of the battery cover 30 is already printed on the battery cover 30, the formation of the second identification information display unit 27 can be omitted. However, since the battery performance of the secondary battery cell 10 strongly depends on the characteristics of the winding group 50, the identification information corresponding to the serial number of the winding group 50 can be easily read on the upper surface of the battery lid 30. By displaying it, the quality for traceability is greatly improved.

If step S23 is completed, in step S24, electrolyte solution will be inject | poured in the battery container 11. Next, in FIG.
A predetermined amount of the electrolytic solution is injected from the liquid injection part 13 of the battery lid 30.
As the electrolytic solution, for example, lithium hexafluorophosphate is 1 mol / L in a mixed solution of ethylene carbonate (EC), dimethyl carbonate (DMC), and diethyl carbonate (DEC) in a volume ratio of 1: 1: 1. A non-aqueous electrolyte solution dissolved in is used.
After injecting the electrolytic solution from the liquid injection part 13, the liquid injection port is sealed with a sealing plug.

When step S24 is completed, the assembly of the secondary battery cell 10 is completed, and then the secondary battery cell 10 is put into a charge / discharge / aging process.
In the charge / discharge / aging process, first, in step S31, the secondary battery cell 10 is charged / discharged, and then in step S32, aging is performed.
FIG. 8 is a diagram for explaining the steps S31 and S32.
The inspection device 70 has a structure in which a pair of probes 71 and 72 connected to the external positive terminal 32 and the external negative terminal 42 and a two-dimensional reader 76 are attached to a support member 74. The tips of the positive and negative probes 71 and 72 and the reader that reads the identification information of the lid member are the same as the tips of the positive and negative probes and the reading surface (not shown) of the reader 76. It is integrally attached to the support member 74 in a state facing the lower surface side that is the direction. The pair of probes 71 and 72 are connected to a charge / discharge inspection circuit 75. Although not shown, the charge / discharge inspection circuit 75 has a circuit for measuring the battery performance of the secondary battery cell 10, such as a voltage value and an internal resistance value. The charge / discharge test circuit 75 is connected to a constant current power source for charging the secondary battery cell 10 and a load for discharging (none of them are shown).

  In step S <b> 31, first, identification information recorded on the second identification information display unit 27 of the battery lid 30 is read by the reader 76. Thereby, the manufacturing number of the wound group 50 built in the secondary battery cell 10 is recognized. Next, the pair of probes 71 and 72 are connected to the external positive terminal 32 and the external negative terminal 42, respectively. Then, the charge / discharge circuit 75 is operated to charge / discharge the secondary battery cell 10. In the first charging, the secondary battery cell 10 is charged until it is fully charged. When the charging is completed, discharging is performed until the discharge end voltage is reached, and step S31 is completed.

Thereafter, in step S32, aging is performed for a certain period of time.
When the aging is completed, the battery performance is inspected by the charge / discharge inspection circuit 75 in step S33. Examples of characteristics indicating battery performance include a voltage value and an internal resistance value.
The voltage value and the internal resistance value measured by the charge / discharge inspection circuit 75 are stored and held in the database together with the serial number of the wound group 50 read by the reader 76.
When performing steps S31 to S33, the first and second identification information display units 26 and 27 of the secondary battery cell 10 are placed on the upper surface of the battery lid 30 on which the external positive electrode terminal 32 and the external negative electrode terminal 42 are arranged. Is formed. Further, in the inspection device 70, a pair of probes 71 and 72 connected to the external positive terminal 32 and the external negative terminal 42 and a reader 76 are integrated. For this reason, the connection between the probes 71 and 72 and the external positive terminal 32 and the external negative terminal 42 and the reading of the identification information by the reader 76 are facilitated and can be performed efficiently.

When step S33 is completed, the third identification information display unit 28 is formed in step S34.
FIG. 9 is a diagram illustrating a method for forming the third identification information display unit 28.
First, as shown in FIG. 9A, the identification information recorded on the second identification information display unit 27 of the secondary battery cell 10 is read by the reader 77. As described above, the identification information recorded in the second identification information display unit 27 is held in the database in correspondence with the battery performance. Based on the identification information read by the reader 77, the battery performance of the corresponding secondary battery cell 10 is read from the database.

Then, as shown in FIG. 9B, information about battery performance such as voltage value and internal resistance value is converted into a data matrix and printed on the upper surface of the battery lid 30 by the laser marker 93. In the case of this identification information printing, when the battery cover 30 is an aluminum metal plate, as described above, it is desirable to perform the ground treatment by previously irradiating the area to be printed with a laser.
Note that the secondary battery cells 10 illustrated in FIGS. 9A and 9B are the same secondary battery cell 10.
When step 34 is completed in this way, the secondary battery cell 10 shown in FIG. 1 is completed.

  The battery performance such as the voltage value and the internal resistance value varies depending on the raw material lot of the wound group 50 or the temperature, humidity, electrolyte, temperature during charging / discharging, time, and the like. When the secondary battery cell 10 is used as a power source for a hybrid vehicle, an electric vehicle or the like, a secondary battery device in which a large number of secondary battery cells 10 are assembled is configured. In such a secondary battery device, it is necessary to keep the battery performance of each secondary battery cell 10 as a component within a certain range. This is because if the battery characteristics of the secondary battery cell 10 vary greatly, it adversely affects the life of the secondary battery device, or a lateral current is generated due to a difference in internal resistance, resulting in locally high heat generation. .

(Secondary battery device)
FIG. 10 is an external perspective view showing an embodiment of the secondary battery device 100.
The secondary battery device 100 is in a state in which a plurality of secondary battery cells 10 face each battery lid 30 upward, have a large area front and back, and the front and back are alternately reversed. And arranged in a row.
Since the secondary battery cells 10 are arranged such that the front and back surfaces of the adjacent secondary battery cells 10 face each other, the positive connection bolt 31 and the negative connection bolt 41 of the adjacent secondary battery cells 10 Are arranged at opposite positions. And every other set, the adjacent secondary battery cell 10 is connected by the inter-cell bus bar 81 fastened by the positive electrode connection bolt 31 and the negative electrode connection bolt 41, and is connected in series as a whole.

In the secondary battery cell 10 positioned on one end side of the secondary battery device 100, the positive electrode connection bolt 31 is not connected to the negative electrode connection bolt 41 of the other secondary battery cell 10. A bus bar 81a is connected. In the secondary battery cell 10 located on the other end side of the secondary battery device 100, the negative electrode connection bolt 41 is not connected to the positive electrode connection bolt 31 of the other secondary battery cell 10. Is connected to a bus bar 81b.
A plurality of secondary battery cells 10 arranged in a straight line are bundled by a circuit container 60. The circuit container 60 includes a pair of main body portions 61 and 62 having a large area disposed on the front side of the secondary battery cell 10 on one end side and the back side of the secondary battery cell 10 on the other end side, A pair of side portions 63 (the other is not shown) for connecting 62 is provided. Wiring is formed on one surface and the other surface of the main body portions 61 and 62, respectively.

  One end of a conducting wire 82 is connected to the bus bar 81 a connected to the positive electrode connecting bolt 31 of the secondary battery cell 10 on one end side, and the other end of the conducting wire 82 is formed on one surface of the main body 61 of the circuit container 60. Connected to wiring. One end of a conductive wire 83 is connected to the bus bar 81 b connected to the negative electrode connection bolt 41 of the secondary battery cell 10 on the other end side, and the other end of the conductive wire 83 is connected to the side portion 63 of the circuit container 60. . The side portion 63 of the circuit container 60 is connected to the other surface of the main body portion 61 and one surface of the main body portion 62.

As described above, the first to third identification information display portions 26 to 28 are formed on the upper surface of the battery lid 30 of each secondary battery cell 10 constituting the secondary battery device 100.
In order to manufacture the secondary battery device 100 illustrated in FIG. 10, the information on the battery performance recorded on the third identification information display unit 28 formed on the battery lid 30 of each secondary battery cell 10 is read. The secondary battery cell 10 having an appropriate battery performance is selected. The third identification information display unit 28 records a voltage value, an internal resistance, and the like, which are battery performance after aging. When the secondary battery cell 10 is selected, the secondary battery device 100 can be manufactured by selecting the secondary battery cell 10 having a voltage value and an internal resistance within predetermined allowable values.
Therefore, by forming the third identification information display unit 28 in the secondary battery cell 10, the secondary battery device 100 with higher performance can be efficiently manufactured.

--Embodiment 2-
FIG. 11 is an external perspective view showing Embodiment 2 of the secondary battery cell 10 and the secondary battery device.
The second embodiment is different from the first embodiment in the arrangement positions of the first to third identification display devices 26 to 28.
In the secondary battery device 100 of the first embodiment, the cleavage valve 12 and the liquid injection part 13 are provided in the substantially central part in the width direction of the battery lid 30 in each secondary battery cell 10, and the first and second identification information. The display units 26 and 27 are arranged between the cleavage valve 12 and the external positive electrode terminal 32, and the third identification information display unit 28 is arranged between the liquid injection unit 13 and the external negative electrode terminal 42. It was.
On the other hand, in the secondary battery device 100A of the second embodiment, the third identification information display unit 28 is arranged at a substantially central portion in the width direction of the battery lid 30 in each secondary battery cell 10A. Further, the first and second identification information display units 26 and 27 are arranged between the third identification information display unit 28 and the external positive electrode terminal 32, and the third identification information display unit 28 and the external negative electrode terminal 42 are arranged. Between them, a cleavage valve 12 and a liquid injection part 13 are provided.

In the second embodiment, since the third identification information display unit 28 is disposed at substantially the center of the battery lid 30, as shown in FIG. 11, the front and back surfaces of the secondary battery cell 10A are alternately opposite to each other. The third identification information display unit 28 is always arranged at the same position, which is almost in the center of the battery lid 30. For this reason, for example, when reading the information on the third identification information display unit 28 in this state, the identification displayed on all the secondary battery cells 10 </ b> A without moving the reading device in the width direction of the battery lid 30. Information can be read.
Other configurations of the second embodiment are the same as those of the second embodiment, and the corresponding members are denoted by the same reference numerals and description thereof is omitted.

(Modification of identification information formation)
FIG. 12 shows another embodiment of a method for forming the third identification information display unit 28.
In this embodiment, when the identification information regarding the battery performance is printed by the laser marker 94 after the charge / discharge aging, the external negative terminal 42 or the external positive terminal 32 is laser-scanned at the same time. FIG. 12 shows the case where the external negative terminal 42 is laser-scanned.
Foreign substances are usually attached to the surfaces of the external positive electrode terminal 32 and the external negative electrode terminal 42, and a continuity failure is likely to occur when connecting to an external device. For this reason, it is desirable to erase foreign matters on the external positive terminal 32 and the external negative terminal 42 by laser irradiation.
In this embodiment, since the surfaces of the external negative electrode terminal 42 and the external positive electrode terminal 32 are cleaned in the step of printing identification information relating to battery performance by the laser marker 94, the working efficiency is improved.

As described above, according to the present embodiment, the following effects are obtained.
(1) Since the first and second identification information display portions 26 and 27 are formed on the upper surface of the battery lid 30 provided with the external positive terminal 32 and the external negative terminal 42, the identification information is read and the battery performance is improved. Discharge aging can be performed efficiently.
(2) The battery performance after aging is stored in association with the information recorded in the second identification information display unit 27. For this reason, after that, it is possible to read the information recorded on the second identification information display unit 27 and print the battery performance. By printing the battery performance, the traceability is improved.

(3) When storing the battery performance after aging in association with the information recorded in the second identification information display unit 27, the reader 76 for reading the second identification information and the battery characteristics after aging are measured. Therefore, the inspection device 70 is formed by integrating the external positive terminal 32 and the probes 71 and 72 connected to the external negative terminal 42. For this reason, an inspection can be performed efficiently.
(4) The information recorded in the second identification information display unit 27 is an electrode group manufacturing information number including the same or corresponding number / symbol as the manufacturing number of the wound group 50. For this reason, it becomes possible to confirm the serial number of the wound group 50 that greatly affects the battery performance without disassembling the secondary battery cell 10, and the traceability is improved.

(5) Before assembling the members constituting the battery lid unit 3 to the battery lid 30, the first identification information display unit 26 in which the serial number of the battery lid 30 was recorded was formed. For this reason, even when the battery lid unit 3 is removed from the line due to a defect or the like during assembly, the information can be held in association with the identification information recorded in the first identification information display unit 26. Easy to do.

(6) Since the third identification information display unit 28 in which information on battery performance is recorded is formed, information on the battery performance recorded in the third identification information display unit 28 when the secondary battery device 100 is created. Can be selected and only those satisfying a predetermined quality can be selected. Thereby, the performance of the secondary battery device 100 can be improved.
(7) As in the second embodiment, the third identification information display unit 28 is formed at substantially the center in the width direction of the battery cover 30 of the secondary battery device 100A. Thereby, when reading the battery performance recorded in the 3rd identification information display part 28, it becomes easy to read with the secondary battery apparatus 100A, and traceability becomes favorable.

(8) As shown in FIG. 12, when reading the information recorded in the third identification information display unit 28, the foreign matter adhering to the external positive terminal 32 and the external negative terminal 42 is removed by laser scanning. To do. For this reason, the cleaning time of the external positive terminal 32 and the external negative terminal 42 can be shortened.

  In the above embodiment, there are three identification information display units 26 to 28 formed on the battery lid 30. However, the number of the identification information display units 26 to 28 is not limited to three, and may be an appropriate number that can trace the history of important processes when assembling the secondary battery cell 10. Moreover, in the said embodiment, although the identification information display parts 26-28 were directly formed in the battery cover 30, the member in which the identification information display parts 26-28 were formed is attached to the upper surface of the battery cover 30. You may do it. In this specification, the cover member includes the battery cover 30 itself and a member in which the identification information display units 26 to 28 are formed on the battery cover 30.

  In the above embodiment, the winding group 50 is formed by winding the positive electrode 51 and the negative electrode 52 in a long shape with the separators 53 and 54 interposed therebetween. However, the positive electrode and the negative electrode may be formed in a rectangular shape and stacked with a rectangular separator interposed therebetween.

  In the above embodiment, the case of a lithium ion secondary battery has been described, but the present invention can also be applied to other secondary battery cells such as a nickel hydride secondary battery cell and a nickel cadmium secondary battery cell.

  In the said embodiment, the secondary battery apparatus 100 was the structure connected by the inter-cell bus bar 81 using the positive electrode connection bolt 31 and the negative electrode connection bolt 41. FIG. However, the connection between the secondary battery cells is not limited to the above connection structure.

  In the above-described embodiment, the secondary battery device 100 is configured such that the circuit container 60 includes a pair of main body portions 61 and 62 having a large area and a pair of side portions 63 that connect the main body portions 61 and 62. It was. However, an appropriate structure can be adopted as the structure of the battery container, such as a box shape as a whole.

The secondary battery cell 10 and the secondary battery device 100 shown in the above embodiment can be used as another electric vehicle, for example, a railway vehicle such as a hybrid train, a shared vehicle such as a bus, a cargo vehicle such as a truck, a battery-type forklift truck. The secondary battery cell 10 and the secondary battery device 100 shown in the above embodiment can be used for a computer system, a server system, and the like. The present invention can also be applied to a power storage device that constitutes a power supply device other than an electric vehicle, such as a power supply device used in an apparatus or a private power generation facility.

  In addition, the secondary battery cell of the present invention can be variously modified and configured within the scope of the invention. In short, an electrode in which a positive electrode and a negative electrode are overlapped via a separator. And a lid member on which the positive electrode electrode and the negative electrode electrode are connected, and a lid member on which the positive electrode electrode and the negative electrode electrode are connected, and at least an opening on the side to which the lid member is attached. What is necessary is just to be provided with the identification information display part in which the identification information which shows at least one of manufacturing information and the information regarding battery performance was displayed on the upper surface of the lid member.

  Further, the manufacturing apparatus of the present invention accommodates an electrode group having a positive electrode and a negative electrode, is connected to a container into which an electrolytic solution is injected, an external positive electrode terminal connected to the positive electrode of the electrode group, and a negative electrode. An apparatus for manufacturing a secondary battery cell having an external negative electrode terminal and a lid member having an identification information display portion formed on an upper surface, the positive battery connected to the external positive electrode terminal and the external negative electrode terminal, respectively And a negative electrode probe and a reader for reading the identification information of the lid member, a reading device in which the tips of the positive electrode and negative electrode probes and the reading surface of the reader are integrated in the same direction, and a positive electrode And a charging / discharging circuit connected to the negative electrode probe and charging / discharging the secondary battery cell, and an inspection circuit for measuring the battery performance of the secondary battery cell after a predetermined time of charging / discharging by the charging / discharging circuit. If you have .

DESCRIPTION OF SYMBOLS 3 Battery cover unit 10 Secondary battery cell 11 Battery container 25 4th identification information display part 26 1st identification information display part 27 2nd identification information display part 28 3rd identification information display part 30 Battery cover 32 External positive electrode Terminal 42 External negative terminal 50 Winding group 60 Circuit container 70 Inspection device 71, 72 Probe 73, 76, 77 Reader (reading device)
91-94 Laser marker

Claims (14)

An electrode group in which a positive electrode and a negative electrode are superimposed via a separator;
A lid member on which an external positive electrode terminal and an external negative electrode terminal to which the positive electrode and the negative electrode are connected; and
Having at least an opening on the side to which the lid member is attached, the electrode group is housed, and a container into which an electrolyte is injected,
An identification information display unit on which identification information indicating at least one of manufacturing information and information on battery performance is displayed is formed on the upper surface of the lid member.   The secondary battery cell according to claim 1, wherein the identification information displayed on the identification information display unit includes information indicating a voltage and an internal resistance of the battery.   3. The secondary battery cell according to claim 1, wherein a plurality of identification information display portions on which identification information given in different steps is displayed are formed on a surface of the lid member. Next battery cell.   The secondary battery cell according to any one of claims 1 to 3, wherein a first identification information display portion on which information on battery performance is displayed on the surface of the lid member, and when the lid member is formed, A second identification information display unit for displaying a serial number at the time of forming a lid unit or forming the electrode group in which the external positive electrode terminal and the external negative electrode terminal are arranged on a lid member is formed. Secondary battery cell. 5. The secondary battery cell according to claim 1, wherein a first identification information display unit on which information on battery performance is displayed on a surface of the lid member, and manufacture when the lid member is formed. A second identification information display section for displaying a number; a third identification information display section for displaying a manufacturing number when the lid unit is formed; and a first identification information related to the manufacturing number when the electrode group is formed. 4. A secondary battery cell, wherein four identification information display portions are formed.   The secondary battery cell according to any one of claims 1 to 5, wherein the lid member is provided with a cleavage valve.   7. The secondary battery cell according to claim 1, wherein a liquid injection port for injecting the electrolytic solution into the lid member is provided. The secondary battery cell according to claim 6 , wherein the external positive electrode terminal, the external negative electrode terminal, the identification information display unit, and the cleavage valve are arranged at intervals in the width direction of the lid member, and the cleavage valve is The secondary battery cell is arranged at the center in the width direction of the lid member.   6. The secondary battery cell according to claim 1, wherein the external positive electrode terminal, the external negative electrode terminal, and the identification information display unit are arranged at intervals in the width direction of the lid member. The secondary battery cell, wherein the identification information display section on which information related to performance is displayed is disposed at a central portion in the width direction of the lid member. In the secondary battery cell according to any one of claims 1 to 9, the secondary battery cell, wherein the identification information is displayed about the cell performance after aging to the identification information display section.   A secondary battery device, wherein a plurality of the secondary battery cells obtained by reading, selecting and combining the identification information displayed on the identification information display unit according to claim 10 are assembled. An electrode group having a positive electrode and a negative electrode is accommodated, a container into which an electrolyte is injected, an external positive terminal connected to the positive electrode of the electrode group and an external negative terminal connected to the negative electrode are arranged, And the manufacturing apparatus of the secondary battery cell which has the lid member in which the identification information display part was formed on the upper surface,
A positive electrode and a negative electrode probe connected to the external positive electrode terminal and the external negative electrode terminal, respectively, a reader for reading identification information of the lid member, a tip of the positive electrode and the negative electrode probe, A reading device integrated with the reading surface facing in the same direction;
A charge / discharge circuit connected to the positive and negative probes and charging / discharging a secondary battery cell;
An apparatus for manufacturing a secondary battery cell, comprising: an inspection circuit for measuring battery performance of the secondary battery cell after a predetermined time of charge / discharge by the charge / discharge circuit.   The secondary battery cell manufacturing apparatus according to claim 12, wherein a manufacturing number of the electrode group is displayed on the identification information display unit provided on the lid member, and further measured by the inspection circuit. A storage unit that stores the battery performance of the secondary battery cell in association with the manufacturing number of the electrode group, and a printing unit that reads the battery performance of the secondary battery cell corresponding to the manufacturing number from the storage unit and prints it on the lid member. An apparatus for producing a secondary battery cell, comprising:   14. The secondary battery cell manufacturing apparatus according to claim 13, wherein the printing means includes means for cleaning the surfaces of the external positive terminal and the external negative terminal.

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