JP2008078083A - Battery state detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery state detection device with a connecting conductor connecting between a detection circuit and an output terminal of a battery prevented from corrosion, and enabled to stand the use for a long period of time. <P>SOLUTION: In the battery state detection device 10 provided with a detection device main body 12 equipped with a detection circuit for detecting a state of a lead storage battery 1, and a cathode-side connecting conductor 13 as well as an anode-side connecting conductor 14 led out from the detection circuit, with the cathode-side connecting conductor and the anode-side connecting conductor connected with an cathode terminal 5 and an anode terminal 6 of the storage battery, respectively, the cathode-side connecting conductor 13 and the anode-side connecting conductor 14 are formed of a material selected from a material group consisting a Cu-Zn-Ni group copper alloy, a Pb-Sb group lead alloy, Pb-Ca group lead alloy and stainless steel. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a battery state detection device that detects the state of a storage battery such as a lead storage battery.

  Recently, the use of storage batteries, such as automobiles, portable devices, and solar power generation facilities, has expanded, and it is important to accurately monitor the state of storage batteries and accurately control their charging and replacement timing. Sex is getting bigger. Particularly in automobile storage batteries, idle stop start (ISS) is performed to reduce engine exhaust gas, and regenerative charging is performed in hybrid vehicles. In order to keep the battery state suitable for each application, it is necessary to attach a battery state detection device to the battery so that the battery state can be constantly monitored.

  A typical example of an inexpensive and high-performance storage battery suitable for use in automobiles and portable devices is a lead storage battery. As a parameter representing the state of the lead storage battery or a parameter to be measured in order to calculate the battery state, internal resistance, discharge voltage, open circuit voltage, remaining capacity, charge state, etc. of the battery are used. The battery state detection device includes a detection circuit having a microcomputer, measures at least one of the above parameters, and calculates a battery state by searching a data map prepared in advance for the measured parameter. Is configured to do.

  When attaching the battery state detection device to the storage battery, attach the detection device main body having a structure in which the detection circuit is housed in the exterior of a resin package or the like to the lid of the battery case, and between the detection device main body and the battery terminal. The connection is made through a bare connection conductor. This type of battery state detection device is disclosed in Patent Document 1 and Patent Document 2.

As a connection conductor for connecting between the detection circuit of the battery state detection device and the output terminal of the battery, usually, a strip plate portion having one end connected to the detection circuit and an annular formed at the other end of the strip plate portion A bare lead plate having a terminal portion is used, and the terminal portion of the lead plate is connected to the output terminal of the battery. In the conventional battery state detection device, the lead plate is formed by punching a plate such as copper or brass having excellent conductivity.
JP 2003-264209 A JP 2005-339969 A

  As described above, in the conventional battery state detection device, a lead plate made of copper or brass was used as a connection conductor for connecting between the detection circuit and the output terminal of the storage battery. If a lead-acid battery equipped with a detector is used in the field for several months or more, the strip or terminal of the lead plate may corrode and damage its appearance. In rare cases, the detection circuit may not function properly. there were.

  An object of the present invention is to provide a battery state detection device that prevents corrosion of a connection conductor connecting between a detection circuit and a battery output terminal, and can withstand long-term use. is there.

  The present invention has a detection device body provided with a detection circuit for detecting the state of a storage battery, and a positive electrode side connection conductor and a negative electrode side connection conductor derived from the detection circuit, and the positive electrode side connection conductor and the negative electrode side connection conductor. Are intended for battery state detection devices respectively connected to the positive terminal and the negative terminal of the storage battery.

  In the present invention, the positive electrode side connecting conductor and the negative electrode side connecting conductor are selected from a material group consisting of a Cu—Zn—Ni based copper alloy, a Pb—Sb based lead alloy, a Pb—Ca based lead alloy, and stainless steel. It is made of a material.

  Since Cu-Zn-Ni-based copper alloys, Pb-Sb-based lead alloys, Pb-Ca-based lead alloys and stainless steel have corrosion resistance, forming connection conductors with these materials can give the connection conductors corrosion resistance. Even if the connection conductor is provided in a bare state, it is possible to prevent the connection conductor from corroding due to long-term use and deteriorating the appearance or impairing the detection function.

  In a preferred embodiment of the present invention, each of the positive electrode side connecting conductor and the negative electrode side connecting conductor has a positive electrode side band plate portion and a negative electrode side band plate portion whose one ends are connected to the detection circuit, and a positive electrode side band plate portion and a negative electrode side band plate portion, respectively. The positive electrode side lead plate and the negative electrode side lead plate which are integrally formed with the positive electrode side terminal portion and the negative electrode side terminal portion which are formed at the other end of the battery and are connected to the positive electrode terminal and the negative electrode terminal of the storage battery. The positive electrode side lead plate and the negative electrode side lead plate are formed by punching a plate of a material selected from the material group.

  When the connecting conductor is formed into the shape of the lead plate as described above, a connecting conductor having a sufficient current carrying capacity can be easily manufactured by punching the plate material, so that the manufacturing cost can be reduced.

  In another preferred embodiment of the present invention, the positive electrode side connecting conductor and the negative electrode side connecting conductor are formed of a Cu—Zn—Ni based copper alloy containing 54 to 58 wt% Cu and 16.5 to 19.5 wt% Ni. .

  A Cu—Zn—Ni based copper alloy containing 54 to 58 wt% of Cu and 16.5 to 19.5 wt% of Ni is known as spring white and has a spring property. Therefore, when the connection conductor is formed of this material, the terminal portion can be provided with a spring property, so that the structure of the terminal portion can be made to be in spring contact with the output terminal of the battery. If the terminal portion of the connecting conductor is in spring contact with the battery output terminal, it is not necessary to perform soldering or welding when connecting the terminal portion to the battery output terminal. Connection to the output terminal can be easily performed. Also, the spring white is excellent in practicality because it can be obtained at a relatively low cost.

  In yet another preferred embodiment of the invention. The positive electrode side connecting conductor and the negative electrode side connecting conductor are respectively formed on the other end of each of the positive electrode side band plate portion and the negative electrode side band plate portion whose one end is connected to the detection circuit, and the positive electrode side band plate portion and the negative electrode side band plate portion. A positive electrode side lead plate and a negative electrode side lead plate integrally having a positive electrode side terminal portion and a negative electrode side terminal portion connected to the positive electrode terminal and the negative electrode terminal of the storage battery. It is formed by rolling a Cu—Zn—Ni based copper alloy containing 54 to 58 wt% of Cu and 16.5 to 19.5 wt% of Ni and punching a plate material formed by performing low temperature annealing.

  It is preferable that a bent portion exhibiting a U shape or a waveform is formed in the positive side band plate part and the negative side band plate part by bending each part.

  Moreover, it is preferable that the positive electrode side connection conductor and the negative electrode side connection conductor are plated with tin or gold.

  Thus, if the positive electrode side connection conductor and the negative electrode side connection conductor are plated with tin or gold, the corrosion resistance of the connection conductor can be further improved.

  The present specification also includes a strip plate portion having one end connected to a detection circuit for detecting the state of the storage battery and a terminal portion formed at the other end of the strip plate portion, the terminal portion being a storage battery. A method of manufacturing a lead plate for a battery state detection device connected to a terminal is disclosed. In a preferred embodiment of this lead plate manufacturing method, a Cu—Zn—Ni based copper alloy containing 54 to 58 wt% Cu and 16.5 to 19.5 wt% Ni is rolled into a plate shape and then subjected to low temperature annealing. A battery state by performing a step of obtaining a plate material, a step of punching the plate material into a shape of a lead plate having a band plate portion and a terminal portion, and a step of bending the band plate portion to form a bent portion Manufacture lead plates for detectors.

  A typical example of a storage battery to which the present invention is applied is a lead storage battery. However, in a battery state detection device that monitors the state of a storage battery other than a lead storage battery, the present invention is also applied when a bare conductor is used as a connection conductor. Of course it can be applied.

  As described above, according to the present invention, the connection conductor is formed from a material selected from the group consisting of Cu—Zn—Ni based copper alloy, Pb—Sb based lead alloy, Pb—Ca based lead alloy and stainless steel. As a result, corrosion resistance can be imparted to the connection conductor, so that it is possible to prevent the connection conductor from corroding due to long-term use and deteriorating the appearance or impairing the detection function.

  FIG. 1 is a perspective view showing an example of the appearance of a battery state detection device for a lead storage battery according to an embodiment of the present invention, and FIG. 2 shows an example of a lead storage battery to which the battery state detection device of FIG. 1 is attached. 3 is a plan view showing a state in which the battery state detection device of FIG. 1 is attached to the lead storage battery of FIG.

  2 and 3, reference numeral 1 denotes an automobile lead-acid battery. The illustrated lead storage battery 1 includes a battery case 2 formed in a rectangular parallelepiped shape, a battery case 4 including a lid 3 that closes an opening at the upper end of the battery case body, a positive electrode plate and a negative electrode housed in the battery case 4. A power generation element (not shown) including a plate is provided, and a positive electrode side output terminal 5 and a negative electrode side output terminal 6 are attached to the lid 3. The output terminals 5 and 6 are attached to one end side in the width direction of the lid 3 in the vicinity of both ends in the longitudinal direction of the lid 3. On the other end side in the width direction of the lid 3, six liquid injection ports 7 respectively connected to the six cell chambers formed in the battery case are formed, and liquid injection plugs (not shown) are attached to the respective liquid injection ports. . The output terminals 5 and 6 of the storage battery are formed in a tapered shape so that each upper end has an outer diameter smaller than the lower end.

  A recess 3 a is formed on the upper surface of the lid 3 in order to attach a battery state detection device to be described later to the lid 3 of the battery case 4. The recess 3a is offset to the output terminals 5 and 6 side of the storage battery so that the battery state detection device does not interfere with a liquid plug or an indicator (not shown) attached to the lid 3 of the battery case. Is provided. In the example shown in the drawing, the recess 3 a is provided at a position between the output terminals 5 and 6 in a state of being shifted to the output terminal 5 side. The recess 3a is formed to have a rectangular outline shape in accordance with the shape of the main body of the battery state detection device described later. A linear positive electrode side lead receiving groove 3b having one end connected to the recess 3a and the other end reaching a position near the lower end of the positive electrode side output terminal 5 of the storage battery on the upper surface of the lid 3 of the battery case; A linear negative electrode lead receiving groove 3c is formed which has one end connected to the recess 3a and the other end reaching a position near the lower end of the negative electrode output terminal 6 of the storage battery.

  In FIG. 1, reference numeral 10 denotes a battery state detection device according to this embodiment. This detection device is derived from a detection device main body 12 configured by housing components of a detection circuit in a package 11, and the detection device main body 12. It consists of a positive electrode side connection conductor 13 and a negative electrode side connection conductor 14. Both the positive electrode side connecting conductor 13 and the negative electrode side connecting conductor 14 are made of bare conductors to which no insulation coating is applied.

  The illustrated package 11 is configured to have a substantially rectangular plate-like appearance. On the surface of the package 11, a battery state display unit 15 for displaying the state of the storage battery is provided, and a push button 16 for operating a manual operation switch operated when starting the detection device or a battery is insufficiently charged. A buzzer 20 or the like is provided for generating an alarm when, for example.

  The electrical connection between the detection device main body 12 and the output terminals 5 and 6 of the storage battery 1 is performed using a highly reliable connection conductor that has vibration resistance and is not easily affected by the surrounding environment. Is preferred. Therefore, in this embodiment, the positive electrode side and negative electrode side connection conductors 13 and 14 are respectively constituted by a positive electrode side lead plate 17 and a negative electrode side lead plate 18 formed by punching a plate of a conductive material.

  The positive electrode side lead plate 17 is a ring plate portion 17a having one end connected to a positive electrode side input terminal of a detection circuit provided in the detection device main body 12, and an annular formed integrally with the other end of the band plate portion 17a. Terminal portion 17b. Further, the negative electrode side lead plate 18 is formed integrally with the strip plate portion 18a having one end connected to the negative electrode side input terminal of the detection circuit provided in the detection device main body 12, and the other end of the strip plate portion 18a. The positive electrode side and negative electrode side lead plates 17 and 18 are led out from one end and the other end of the package 11 of the detection device main body 12 in opposite directions, respectively.

  In the illustrated example, the portions near the other ends of the band plate portions 17a and 18a are bent upward at a right angle to form rising portions 17a1 and 18a1, and the upper ends of these rising portions are the upper portions of the band plate portions 17a and 18a. By bending at right angles in a direction parallel to the plate surface, tip portions 17a2 and 18a2 are formed, and annular terminal portions 17b and 18b are integrally formed at these tip portions, respectively. Steps are formed between the strips 17a and 18a of the lead plates 17 and 18 and the terminal portions 17b and 18b by the rising portions 17a1 and 18a1.

  Terminal portions 17b and 18b respectively provided on the positive electrode side lead plate 17 and the negative electrode side lead plate 18 are smaller than the outer diameters of the lower ends of the positive electrode side output terminal 5 and the negative electrode side output terminal 6 of the tapered storage battery, The positive electrode side output terminal 5 and the negative electrode side output terminal 6 have inner diameters larger than the outer diameters of the upper ends, and these terminal portions 17b and 18b are tightly fitted to the lower ends of the output terminals 5 and 6 of the storage battery, respectively. Connected in state.

  A plurality of slits (cuts) 17b1 and 18b1 extending in the radial direction are provided at equal intervals in the circumferential direction on the inner peripheral portions of the annular terminal portions 17b and 18b of the lead plates 17 and 18. Thus, when a plurality of slits are formed on the inner peripheral side of the terminal portion of each lead plate, when each terminal portion is fitted to the corresponding output terminal of the storage battery, the gap between the slits of each terminal portion is Since the part can be easily elastically deformed and the tip of the part between the slits can be fitted into the corresponding output terminal of the storage battery and tightly fitted, the electrical connection between each lead plate and the output terminal of the storage battery Connection can be made reliably.

  In the illustrated example, the portions of the lead plate portions 17 and 18 near the package 11 of the strip plate portions 17a and 18a are bent into a U-shape, so that the buffer portions 17c and 18b are partially formed on the strip plate portions 17a and 18a. 18c is formed. These buffer portions 17c and 18c are used when stress is generated in the lead plates 17 and 18 due to thermal expansion and contraction, or when stress is generated in the lead plates 17 and 18 due to mechanical vibration transmitted to the lead plates 17 and 18. By deforming easily and allowing expansion and contraction of the band plate portions 17a and 18a, it acts to absorb the stress generated in the lead plates 17 and 18. The buffer portions 17c and 18c may be formed of a bent portion formed by bending a part of the band plate portions 17a and 18a into a waveform.

  The battery state detection device 10 fits the terminal portions 17b and 18b provided at the end portions of the lead plates 17 and 18 to the output terminals 5 and 6 of the battery, respectively, and the detection device main body 12 to the lid 3 of the battery case. The lead storage battery 1 is attached as shown in FIG. 3 by fitting in the provided recess 3a and arranging the lead plates 17 and 18 inserted in the grooves 3b and 3c, respectively.

  In the present invention, the connection conductors 13 and 14 (lead plates 17 and 18) for connecting the detection device main body 12 to the positive electrode side and negative electrode side output terminals 5 and 6 of the storage battery are connected to the Cu—Zn—Ni based copper alloy, Pb. -It forms with the material selected from the material group which consists of Sb system lead alloy, Pb-Ca system lead alloy, and stainless steel.

  The band plate portions 17a and 18a of the lead plates 17 and 18 and the terminal portions 17b and 18b constituting the connection conductors 13 and 14, respectively, may be formed separately and joined by welding or the like. And in order to improve durability, it is desirable that the strip plate portions 17a and 18a and the terminal portions 17b and 18b are integrally formed.

  The lead plate in which the band plate portions 17a and 18a and the terminal portions 17b and 18b are integrally formed can be easily manufactured by performing a punching process for punching a plate material and a bending process for bending a required portion.

  In the illustrated example, a plurality of slits are formed on the inner periphery of the terminal portion of the lead plate so that each terminal portion is in spring contact with the corresponding output terminal of the storage battery. The connection of the output terminal may be by welding or soldering, or the terminal portion of the lead plate may be screwed to the output terminal of the storage battery.

  In addition, since the output terminal of the lead storage battery is formed of a lead alloy, when the lead plate is formed of a copper alloy or stainless steel, the terminal portion of the lead plate and the output terminal of the battery cannot be connected by welding. . When the lead plate is formed of a copper alloy, it is necessary to connect the terminal portion of the lead plate to the output terminal of the battery by methods such as spring contact, fitting, soldering, and screwing. Also, since stainless steel has poor solderability, when the lead plate is made of stainless steel and the terminal portion of the lead plate is soldered to the battery output terminal, the lead plate terminal portion is to be soldered. It must be plated with tin or gold.

  It is necessary to connect the lead plate to the terminal portion of the detection circuit. The connection between the lead plate and the terminal portion of the detection circuit is preferably performed by soldering. Therefore, when the lead plate is formed of stainless steel having poor solderability, it is necessary to apply tin or gold plating to the portion to be soldered to the detection circuit at one end of the strip portion of the lead plate.

  Among the materials for forming the lead plate described above, those having excellent spring properties, good solderability, low cost, and easy availability are obtained by using 54.0 to 58.0% copper and nickel. It is a Cu-Zn-Ni-based alloy (spring white) containing 16.5 to 19.5% and having a composition in which zinc accounts for a considerable amount of the balance. It is most preferable to form each lead plate by rolling the plate for springs into a plate shape and then punching out the plate material whose material is improved by removing the residual stress by low-temperature annealing.

  When the lead plate is formed of a lead alloy, it is desirable to use a material containing antimony or calcium in order to give a certain degree of hardness and to improve handling and vibration resistance during manufacturing. When a lead alloy containing antimony is used, the antimony content is preferably 11 wt% or less in order to suppress segregation.

  In order to further improve the corrosion resistance of the lead plate, it is desirable to apply tin plating or gold plating to the entire band plate portion and terminal portion of the lead plate.

Hereinafter, preferred embodiments of the present invention will be described together with comparative examples.
[Example 1]
A plate material of 0.2 mm thickness, which is obtained by rolling the spring white and performing low temperature annealing to remove the residual strain, is bent, and as shown in FIG. 1 were prepared, and the battery state detection device 10 shown in FIG. 1 was prepared using these as the negative electrode side connection conductor 13 and the positive electrode side connection conductor 14. Table 1 below shows the results of examining the occurrence of corrosion of the lead plates 17 and 18 by mounting the B24 type lead storage battery with the battery state detection device mounted on 200 automobiles.

  In this example, discoloration due to corrosion was observed on the lead plate 300 days after the start of the test, but discoloration due to corrosion was observed in only one of the 200 units.

[Example 2]
The entire lead plate made of the same material as in Example 1 was plated with tin having a thickness of 2 μm, and the battery state detection device 10 shown in FIG. 1 was made using this lead plate. Table 2 below shows the results of examining the occurrence of corrosion of the lead plates 17 and 18 by mounting B24 type lead-acid batteries equipped with this battery state detection device on 200 automobiles.

  In this example, even after 300 days from the start of the test, there was no sample in which the lead plate was discolored due to corrosion.

[Comparison 1]
A lead plate was prepared in the same manner as in Example 1 by using a phosphor phosphor bronze plate having a thickness of 0.2 mm as a material, and the battery state detection device 10 shown in FIG. 1 was prepared using this lead plate. The results of examining the occurrence of corrosion of the lead plates 17 and 18 by mounting B24 type lead storage batteries equipped with this battery state detection device on 200 automobiles are shown in Table 3 below.

  In Comparative Example 1, discoloration due to corrosion was observed on the lead plates of two samples as early as 100 days from the start of the test, and discoloration due to corrosion was observed on the lead plates of three samples on the 200th and 300th days, respectively. Was recognized. The number of samples in which the color change occurred in the lead plate was much larger than that in Examples 1 and 2.

[Comparison 2]
Similar to Comparative Example 1, the entire lead plate formed of a 0.2 mm spring phosphor bronze plate is subjected to tin plating with a thickness of 2 μm, and the battery state detection device shown in FIG. 10 was created. Table 4 below shows the results of examining the occurrence of corrosion of the lead plates 17 and 18 by mounting B24 type lead-acid batteries equipped with this battery state detection device on 200 automobiles.

  In Comparative Example 2, discoloration due to corrosion was observed on the lead plate of one sample on the 100th day from the start of the test, and discoloration due to corrosion was observed on the lead plates of the 2 and 3 sample samples on the 200th and 300th days, respectively. Was recognized. Although the corrosion resistance of the lead plate was slightly improved as compared with Comparative Example 1, it was found that it was much inferior compared with Examples 1 and 2.

  From the above results, it has been clarified that, when configured as in Example 1 and Example 2, a result that is remarkably superior to that of the comparative example can be obtained. In particular, when the lead plate is tin-plated as in Example 2, there is no example where the lead plate is discolored due to corrosion, indicating that the effect of improving the corrosion resistance of the lead plate is great.

  In the above embodiment, the lead plate was formed of a Cu-Zn-Ni alloy, but it is proved that the lead alloy has sufficient corrosion resistance as is apparent from the fact that the lead alloy is used as the output terminal of the lead storage battery. In addition, since stainless steel also has high corrosion resistance, the above-described embodiment is applicable even when the lead plate is formed of Pb-Sb lead alloy and Pb-Ca lead alloy and when the lead plate is formed of stainless steel. Similarly to the above, the corrosion resistance of the lead plate can be improved.

  In the above embodiment, tin plating is applied to the entire lead plate. However, corrosion resistance can be further improved by applying gold plating to the entire lead plate instead of tin plating.

  In the above embodiment, the connection conductors 13 and 14 are constituted by the lead plates 17 and 18. However, the present invention is also applied to the case where the connection conductor is constituted by a bare conductor having a circular cross section with a terminal portion connected to the end portion. can do.

It is the perspective view which showed the external appearance of the battery state detection apparatus concerning embodiment of this invention. It is the perspective view which showed an example of the lead acid battery which attaches the battery state detection apparatus of FIG. It is the top view which showed the state which attached the battery state detection apparatus to the lead acid battery of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lead storage battery 4 Battery case 5 Positive electrode side output terminal 6 Negative electrode side output terminal 10 Battery state detection apparatus 12 Detection apparatus main body 13 Positive electrode side connection conductor 14 Negative electrode side connection conductor 17 Positive electrode side lead plate 18 Negative electrode side lead plate 17a Band plate part 17b Terminal part 18a Band plate part 18b Terminal part

Claims (6)

A detection device body having a detection circuit for detecting the state of the storage battery; and a positive electrode side connection conductor and a negative electrode side connection conductor derived from the detection circuit, wherein the positive electrode side connection conductor and the negative electrode side connection conductor are respectively In the battery state detection device connected to the positive electrode terminal and the negative electrode terminal of the storage battery,
The positive electrode side connection conductor and the negative electrode side connection conductor are formed of a material selected from a material group consisting of a Cu—Zn—Ni based copper alloy, a Pb—Sb based lead alloy, a Pb—Ca based lead alloy, and stainless steel. The battery state detection device characterized by being made. The positive electrode side connection conductor and the negative electrode side connection conductor are respectively formed on the other end of each of the positive electrode side band plate portion and the negative electrode side band plate portion, one end of which is connected to the detection circuit, and the positive electrode side band plate portion and the negative electrode side band plate portion. A positive electrode side lead plate and a negative electrode side lead plate integrally having a positive electrode side terminal portion and a negative electrode side terminal portion connected to the positive electrode terminal and the negative electrode terminal of the storage battery,
The battery state detection device according to claim 1, wherein the positive electrode side lead plate and the negative electrode side lead plate are formed by punching a plate of a material selected from the material group. A detection device main body having a circuit for detecting a state of the storage battery; and a positive electrode side connection conductor and a negative electrode side connection conductor derived from the detection device main body, wherein the positive electrode side connection conductor and the negative electrode side connection conductor are respectively storage batteries. In the battery state detection device connected to the positive electrode terminal and the negative electrode terminal of
The battery state, wherein the positive electrode side connection conductor and the negative electrode side connection conductor are formed of a Cu—Zn—Ni based copper alloy containing 54 to 58 wt% Cu and 16.5 to 19.5 wt% Ni. Detection device. The positive electrode side connection conductor and the negative electrode side connection conductor are respectively formed on the other end of each of the positive electrode side band plate portion and the negative electrode side band plate portion, one end of which is connected to the detection circuit, and the positive electrode side band plate portion and the negative electrode side band plate portion. A positive electrode side lead plate and a negative electrode side lead plate integrally having a positive electrode side terminal portion and a negative electrode side terminal portion connected to the positive electrode terminal and the negative electrode terminal of the storage battery,
The positive electrode-side lead plate and the negative electrode-side lead plate are formed by rolling the Cu-Zn-Ni-based copper alloy and punching a plate material formed by low-temperature annealing. 4. The battery state detection device according to 3.   5. The battery state detection device according to claim 2, wherein a part of the positive electrode side band plate portion and the negative electrode side band plate portion is bent to form a bent portion having a U shape or a waveform.   6. The battery state detection device according to claim 1, wherein the positive electrode side connection conductor and the negative electrode side connection conductor are plated with tin or gold.

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