JP2018063861A - Electrode plate with film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode plate in which a plurality of electrodes connected to a plurality of storage batteries are arranged in a plane, and a case where a higher density is required for a plurality of independent electrodes included in the electrode plate. Another object of the present invention is to provide an electrode plate with a film that can fix each electrode to a reinforcing plate while maintaining the relative positional accuracy of each electrode.
SOLUTION: Each electrode is held on a film via an ultraviolet peelable adhesive layer whose adhesive strength is reduced by ultraviolet irradiation or a heat peelable adhesive layer whose adhesive strength is reduced by heat treatment. This solves the above problem.
[Selection] Figure 1

Description

  The present invention relates to an electrode plate in which a plurality of electrodes connected to a plurality of storage batteries are arranged in a plane, and the electrode plate relates to an electrode plate with a film provided on a film via an adhesive layer.

  Conventionally, as an electrode plate connected to a plurality of storage batteries arranged in parallel, a metal plate processed into a shape corresponding to the position of the terminal of the storage battery by pressing or etching (for example, a patent) Reference 1).

  FIG. 5 is a diagram showing an example of the positional relationship between each electrode of the electrode plate and each terminal of the storage battery, FIG. 5 (a) is a schematic plan view, and FIG. 5 (b) is an A- in FIG. 5 (a). It is A sectional drawing.

For example, as shown in FIG. 5A, when a plurality of storage batteries 131 are closely arranged in parallel, the electrode 111a that acts as the positive electrode of the electrode plate 111 and the electrode 111b that acts as the negative electrode of the electrode plate 111, Portions connected to the terminals (+ terminal or −terminal) of the storage battery 131 (portions extending in the horizontal direction like branches in FIG. 5A) are in a mutually adjacent positional relationship.
Here, the electrode 111a and the electrode 111b are electrically independent from each other and are not allowed to contact each other.

In the example shown in FIG. 5A, the electrode 111a and the electrode 111b each have a wide trunk-like portion extending in the vertical direction in the drawing.
This is because the electric resistance is lowered so that the current collected by the portion extending like a branch in the horizontal direction in the drawing can easily flow through a portion such as a wide trunk extending in the vertical direction.

Although omitted in FIG. 5A, as shown in FIG. 5B, the electrode plate 111 is usually disposed on the storage battery 131 via an insulating reinforcing plate 114. .
The reinforcing plate 114 is provided with openings according to the positions and shapes of the terminals of the storage battery 131, and the electrodes of the electrode plate 111 and the terminals of the storage battery 131 are connected through the openings. .
The independent electrodes 111a and 111b are aligned and fixed to the reinforcing plate 114 with an adhesive, for example.

FIG. 5 is an example mainly showing that the gap between the electrode 111a acting as the positive electrode and the electrode 111b acting as the negative electrode is narrow, and the electrode of the electrode plate 111 can take various other forms. .
Moreover, the electrode which the electrode plate 111 has may also have the form of the serial connection which connects each + terminal and-terminal of the some storage battery 131 other than the form of the parallel connection shown in FIG.

JP 2014-146516 A

Conventionally, since the size of the storage battery 131 was large and the number of the storage batteries 131 used was small, the positional accuracy was not particularly problematic when fixing each electrode of the electrode plate 111 to the reinforcing plate.
However, in recent years, due to demands for higher capacity and long-term stabilization, by reducing the size of storage batteries and arranging a large number of them, even if a part of the storage battery malfunctions, long-term operation is performed by excluding defective cells. Is a structure that can be realized. In this structure, small storage batteries are arranged at high density, and accordingly, each electrode of the electrode plate needs to be arranged at high density, and the positional accuracy between the electrodes becomes a problem.

More specifically, for example, in the example shown in FIG. 5A, since the electrode 111a and the electrode 111b are electrically independent from each other, conventionally, the electrode 111a and the electrode 111b are: Each of the separated electrodes 111a and 111b is individually fixed to the reinforcing plate 114 by press working or etching.
However, in recent years, the interval between the + terminal and the − terminal of the storage battery 131 has become narrower, and accordingly, the gap between the electrode 111a and the electrode 111b has also become narrower, and each of the electrode 111a and the electrode 111b can be individually set. In the method of fixing to the reinforcing plate 114, it has been difficult to maintain the gap with high accuracy.

Further, when the number of storage batteries 131 to be used increases, the area occupied by the electrode plate 111 increases accordingly, and the area of the electrodes 111a and 111b also increases, so that it is more difficult to maintain the gap with high accuracy. It was.
And when the electrode 111a and the electrode 111b contact, the malfunction that the electrical short circuit (short circuit) will arise has arisen.

  The present invention has been made in view of the above circumstances, and maintains the relative positional accuracy of each electrode even when a high density is required for each of a plurality of independent electrodes included in the electrode plate. The main object is to provide an electrode plate with a film capable of fixing each electrode to a reinforcing plate.

  In the invention according to claim 1 of the present invention, an electrode plate is provided on a film via an adhesive layer, and the adhesive layer is an ultraviolet peelable adhesive layer whose adhesive strength is reduced by ultraviolet irradiation, or heating. It is a heat-peelable adhesive layer whose adhesive force is reduced by the treatment, and the electrode plate has a configuration in which a plurality of electrically independent electrodes are arranged in a plane, the thickness of the electrode is T, and the plurality of the electrodes When the shortest distance between the electrodes is S, T is in the range of 0.05 mm to 1.0 mm, and S / T is in the range of 0.5 to 20 with a film It is an electrode plate.

  Further, in the invention according to claim 2 of the present invention, the region where the electrode is formed on the film is a rectangular region having a long side length of 300 mm or more and 2000 mm or less in plan view, 2. The electrode plate with a film according to claim 1, wherein the electrode is formed in an electrically connected form in a length direction of the long side.

  The invention according to claim 3 of the present invention is characterized in that the electrode plate is made of any one of aluminum, aluminum alloy, copper, copper alloy, and stainless alloy. Item 3. The electrode plate with film according to Item 2.

  Further, the invention according to claim 4 of the present invention is an insulating property in which an opening is provided at a position corresponding to the electrode on the surface of the electrode plate opposite to the side on which the film is provided. The electrode plate with a film according to any one of claims 1 to 3, wherein the electrode plate with a film is provided.

  According to the electrode plate with a film according to the present invention, even when high density is required for a plurality of independent electrodes included in the electrode plate, while maintaining the relative positional accuracy of each electrode, Can be fixed to the reinforcing plate.

The figure shown about an example of 1st Embodiment of the electrode plate with a film which concerns on this invention The figure shown about an example of 2nd Embodiment of the electrode plate with a film which concerns on this invention Schematic process drawing showing an example of a method for producing an electrode plate with a film according to the present invention The figure shown about an example of the usage method of the electrode plate with a film which concerns on this invention The figure shown about an example of the positional relationship between each electrode of an electrode plate and each terminal of a storage battery

<Electrode plate with film>
Hereinafter, an electrode plate with a film according to the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing an example of a first embodiment of an electrode plate with a film according to the present invention.
In addition, FIG. 1 is for demonstrating each structure of the electrode plate 1 with a film as an example of the electrode plate with a film which concerns on this embodiment, For example, of the electrode in the electrode plate with a film which concerns on this embodiment The number and the planar form are not limited to the example shown in FIG. The same applies to FIGS.

As shown in FIG. 1, the electrode plate 1 with a film has a configuration in which an electrode plate 11 is provided on a film 13 via an adhesive layer 12.
The electrode plate 11 includes an electrode 11a and an electrode 11b, and the electrodes 11a and 11b are electrically independent from each other.
The electrodes 11a and 11b are held on the film 13 via the adhesive layer 12 while maintaining a gap of distance (S).

As described above, in the electrode plate 1 with a film, the electrodes 11a and 11b are held on the film 13 via the adhesive layer 12, so that the gap of S distance is maintained, that is, In the state where the relative positional accuracy of the electrodes 11a and 11b is maintained, it is possible to carry out processes such as transport and adhesion with other objects.
Therefore, according to the electrode plate with a film of the present embodiment, each electrode can be fixed to the reinforcing plate while maintaining the relative positional accuracy of each electrode.

Here, in the electrode plate with a film of the present embodiment, it is possible to accurately maintain the gap between the electrodes even when the area occupied by the electrode plate is large or the area of each electrode is large. is there.
That is, in the electrode plate with a film of the present embodiment, depending on the thickness and the like, both the metal plate constituting the electrode plate 11 and the film material constituting the film 13 can be in a roll form. . Therefore, for example, the electrode plate 1 with a large area can be formed by a roll-to-roll manufacturing method.

By using such a manufacturing method, even if the region occupied by the electrode plate, that is, the region where the electrode is formed is a rectangular region having a long side length of 300 mm or more and 2000 mm or less, for example, According to the electrode plate with a film of the embodiment, the gap between the electrodes can be accurately maintained.
In addition, the planar form of the electrodes can be formed, for example, in a form (electrically connected form) that is continuously connected from the end of the large-area region as described above to the other end. It is.

(Electrode plate 11)
As a material constituting the electrode plate 11 of the electrode plate 1 with a film, any material can be used as long as it has conductivity and can be etched for an electrode of a storage battery. As such a material, for example, conductive metals such as aluminum (Al), aluminum alloy, copper (Cu), copper alloy, and stainless steel alloy can be preferably exemplified.

Among them, aluminum (Al) has a small specific gravity, so the number of storage batteries increases due to the demand for higher capacity, and the number of electrodes increases accordingly, and the area occupied by the electrode plate as an assembly of electrodes is large. Even if it makes it, it can reduce the weight of the entire electrode plate, which is preferable.
Aluminum (Al) also has corrosion resistance due to a passive film (surface oxide film), which is preferable in that it is not necessary to provide a protective layer for corrosion resistance.

The thickness (T) of the electrode plate 11 is selected from the range of 0.05 mm or more and 1.0 mm or less depending on the current capacity to be used.
Although depending on the current capacity to be used and the planar size of each electrode, if the thickness (T) of the electrode plate 11 is less than 0.05 mm, it is not preferable in that the electrical resistance increases.
Moreover, when the thickness (T) of the electrode plate 11 is larger than 1.0 mm, it is not preferable in that it becomes difficult to etch a minute gap and the weight of the electrode plate 11 increases.
In the present invention, the thickness (T) of the electrode plate 11 can be handled as being equivalent to the thickness of the electrodes 11a and 11b.

The gap between the electrode 11a and the electrode 11b is preferably small in view of the demand for higher density, but the thickness (T) of the electrode plate 11 also affects the etching process of such a small gap.
Therefore, when the shortest distance between the electrodes 11a and 11b is S, the value obtained by dividing S by T (the value of S / T) is preferably in the range of 0.5 to 20.
In processing using an etchant, it is difficult to make the value of S / T less than 0.5. On the other hand, if the value of S / T is larger than 20, there is a possibility that the demand for higher density cannot be satisfied. Because.

(Adhesive layer 12)
The material constituting the adhesive layer 12 of the electrode plate with film 1 can be transported and fixed to the reinforcing plate while maintaining the relative positional accuracy of the electrodes 11a and 11b until the film 13 is peeled off. And after fixing electrode 11a, 11b to a reinforcement board, it is preferable that the film 13 can be peeled easily.
For example, as such an adhesive layer 12, an ultraviolet (UV) peelable adhesive layer whose adhesive strength is reduced by irradiation with ultraviolet rays (UV) or a heat peelable adhesive layer whose adhesive strength is reduced by heat treatment is preferably used. be able to.

In the case of an ultraviolet (UV) peelable adhesive layer, it is desirable that the peel force before ultraviolet (UV) irradiation is 5 N / 25 mm or more and the peel force after ultraviolet (UV) irradiation is 0.15 N / 25 mm or less.
As the ultraviolet (UV) irradiation lamp, any lamp having an emission spectrum at wavelengths of 365 nm and 420 nm can be used, and the irradiation amount is adjusted according to the emission spectrum of the lamp.
For example, as a release film having such an ultraviolet (UV) peelable adhesive layer, Somatack 125UV manufactured by Somar can be used.

(Film 13)
The material constituting the film 13 of the electrode plate with film 1 is resistant to processes such as etching applied to the electrode plate 11, and the relative positional accuracy of the electrodes 11a and 11b is maintained until the film 13 is peeled off. Any material can be used as long as it can be transported or fixed to the reinforcing plate.
For example, a PET film having a low heat shrinkage rate that has been annealed can be suitably used.

(Second Embodiment)
FIG. 2: is a figure shown about an example of 2nd Embodiment of the electrode plate with a film which concerns on this invention.
As shown in FIG. 2, the electrode plate with film 2 has a configuration in which an insulating reinforcing plate 14 is provided on the electrode plate 11 of the electrode plate with film 1 shown in FIG.
The reinforcing plate 14 is provided with openings 15a and 15b at positions corresponding to the electrodes 11a and 11b. Through these openings 15a and 15b, the electrodes 11a and 11b of the electrode plate 11 and the corresponding terminals of the storage battery are connected.
In other words, the reinforcing plate 14 is provided with openings 15a and 15b according to the positions and shapes of the terminals of the storage battery, and the openings 15a and 15b and the electrodes 11a and 11b of the electrode plate 11 are aligned. The electrode plate 11 is fixed to the reinforcing plate 14.
Although not shown, an adhesive may be provided between the electrode plate 11 and the reinforcing plate 14. Examples of the adhesive include an epoxy adhesive.

(Reinforcing plate 14)
As a material constituting the reinforcing plate 14, any material can be used as long as it has insulating properties, can hold each electrode of the electrode plate 11 and can be connected to a corresponding storage battery terminal. Further, it is preferable that the rigidity is higher than that of the electrode plate 11.
As a material substrate having such performance, for example, an epoxy substrate with a glass nonwoven fabric or a flame retardant resin substrate can be used. Further, a bakelite plate, a BT resin substrate, or the like may be used.
As the reinforcing plate 14 fixed to the electrode plate 11, a substrate that has been previously subjected to external processing as the reinforcing plate 14 and formation of the openings 15a and 15b is used.

<Method for producing electrode plate with film>
Next, the manufacturing method of the electrode plate with a film which concerns on this invention is demonstrated.
FIG. 3 is a schematic process diagram showing an example of a method for producing an electrode plate with a film according to the present invention.

  In order to manufacture the electrode plates 1 and 2 with a film as described above, for example, first, a metal plate 11A is prepared, a photosensitive resist film is provided on the metal plate 11A, and exposure and development are performed using a photomask. Then, as shown in FIG. 3A, a resist pattern 41 is formed on the metal plate 11A.

  The metal plate 11A becomes the electrode plate 11 of the electrode plates 1 and 2 with a film, and examples of the material include conductive materials such as aluminum (Al), aluminum alloy, copper (Cu), copper alloy, and stainless steel alloy. Can be used.

  As the photosensitive resist film, a dry film resist can be suitably used. The photosensitive resist film can be either a negative type or a positive type. Note that resist patterns 41a and 41b shown in FIG. 3A are resist patterns corresponding to the electrodes 11a and 11b, respectively.

  Next, as shown in FIG. 3B, the film 13 with the adhesive layer 12 is laminated on the surface of the metal plate 11A opposite to the surface on which the resist pattern 41 is formed.

  Next, as shown in FIG. 3C, the metal plate 11A is etched with an etching solution from the opening of the resist pattern 41, and then the resist pattern 41 is removed, as shown in FIG. The electrode plate 1 with a film having the electrode 11a and the electrode 11b is obtained.

  For removing the resist pattern 41, for example, a stripping solution is used, and if necessary, cleaning is performed. Furthermore, when improving the adhesiveness when fixing with the reinforcement board 14, surface treatment is performed suitably.

  Next, as shown in FIG. 3 (e), the openings 15a and 15b of the reinforcing plate 14 and the electrodes 11a and 11b of the electrode plate 11 are aligned, and the electrode plate 11 of the electrode plate with film 1 is attached to the reinforcing plate. 14 to obtain an electrode plate 2 with a film as shown in FIG.

  In FIG. 3E, for the sake of convenience, the reinforcing plate 14 is disposed on the upper side and the electrode plate 1 with film is disposed on the lower side. However, when the electrode plate 11 is fixed to the reinforcing plate 14, A method of arranging the reinforcing plate 14 on the lower side and bonding the surface of the electrode plate 11 of the electrode plate with film 1 from above is easy.

  As a method for fixing the electrode plate 11 to the reinforcing plate 14, for example, an adhesive or an adhesive film is placed on a portion of the reinforcing plate 14 that contacts the electrodes 11 a and 11 b, and the position is aligned on the adhesive plate 11. The plate 11 is placed and pressure bonded. Adhesion conditions are performed under conditions suitable for the adhesive used, and heating is performed as necessary.

<Usage method of electrode plate with film>
Next, a method for using the electrode plate with a film according to the present invention, that is, a method for obtaining a storage battery module by connecting the electrode plate with a film according to the present invention to each terminal of a plurality of storage batteries will be described.
FIG. 4 is a diagram illustrating an example of a method of using the electrode plate with a film according to the present invention.
In the example shown in FIG. 4, the adhesive layer 12 is an ultraviolet (UV) peelable adhesive layer whose adhesive strength is reduced by ultraviolet (UV) irradiation.

For example, in order to obtain the storage battery module 50 using the method shown in FIG. 4, first, as shown in FIG. 4A, the film 13 is irradiated with ultraviolet rays 21 from the film 13 side of the electrode plate 2 with film. Is peeled off to obtain a laminate (current collector plate) of the electrode plate 11 and the reinforcing plate 14 as shown in FIG.
As the lamp for irradiating the ultraviolet light 21, for example, a lamp having an emission spectrum at wavelengths of 365 nm and 420 nm can be used, and the irradiation amount is adjusted according to the emission spectrum of the lamp.

  In addition, it is preferable to wash | clean the surface of the electrode plate 11 which peeled and exposed the film 13. FIG. This is for removing the remaining adhesive layer 12.

Next, the surfaces of the electrodes 11a and 11b exposed from the openings 15 of the reinforcing plate 14 of the laminate (current collector plate) shown in FIG. 4B are connected to the terminals of the storage batteries 31a and 31b, respectively. The storage battery module 50 shown in 4 (c) is obtained.
As the connection method, there are a method of connecting using ultrasonic waves and a method of melting and connecting a conductive metal such as solder.

  In the above description, an example in which the adhesive layer 12 is an ultraviolet (UV) peelable adhesive layer has been described. However, in the present invention, the adhesive layer 12 is a heat peelable adhesive whose adhesive strength is reduced by heat treatment. It may be a layer. In this case, heat treatment may be performed instead of the irradiation with the ultraviolet rays 21 shown in FIG.

  As mentioned above, although each embodiment was described about the electrode plate with a film concerning this invention, this invention is not limited to the said embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention and exhibits the same function and effect regardless of the case. Are included in the technical scope.

  Hereinafter, the present invention will be described more specifically with reference to examples.

[Example 1]
As the metal plate 11A shown in FIG. 3A, a pure aluminum plate was used, product number A1080, and a plate thickness of 0.3 mmt.
The purity of aluminum is not particularly limited as long as the conductivity can be ensured, but 99% or more is suitable, and A1050, A1230, and A1085 may be used.

  In general, degreased cleaning is performed on an aluminum plate because the oil component during rolling adheres to the surface. As the cleaning agent, an alkaline degreasing agent, an acid degreasing agent, or a neutral degreasing agent can be used, and washing was performed using an acid degreasing agent ADEKA C-720. Concentration, temperature, and treatment time were appropriately adjusted according to the surface condition of the aluminum plate, and the oil on the surface was removed at a concentration of 20%, a temperature of 40 ° C., and a treatment time of 3 minutes.

A photosensitive dry film resist (AQ-2558 manufactured by Asahi Kasei) was laminated on one surface of the aluminum plate as a photosensitive resist film for forming the resist pattern 41 shown in FIG.
Lamination conditions were performed at a roll temperature of 120 ° C., a pressure of 0.3 MPa, and a feed rate of 1.0 m / min. Using a photomask, a desired electrode pattern was baked with an ultraviolet exposure machine and developed.
Development was performed with a sodium carbonate 1.0% solution, a temperature of 30 ° C., and a spray pressure of 0.2 MPa, followed by spray water washing and hot air drying.

On the surface opposite to the surface provided with the photosensitive dry film resist of this aluminum plate, as an adhesive layer 12 and film 13 shown in FIG. Somatack 125UV) was laminated.
Lamination was performed at room temperature with a pressure of 0.2 MPa and a feed rate of 0.5 m / min. As the base PET film, a film having a thickness of 100 μm or 125 μm was used, and a low heat shrinkage film subjected to annealing treatment was used.

  The aluminum etching process shown in FIG. 3C was performed using an iron chloride etchant. This was carried out at an iron chloride concentration of 500 g / L, a temperature of 50 ° C., and a spray pressure of 0.2 MPa, and the processing time was appropriately adjusted to form a desired shape.

The photosensitive dry film resist shown in FIG. 3D was peeled off by using a 1% sodium hydroxide solution at a temperature of 50 ° C. and a spray pressure of 0.1 MPa, and similarly adjusting the treatment time appropriately.
Moreover, in order to further wash | clean the surface of this aluminum electrode plate, it processed with ADEKA C-720 used for said degreasing washing | cleaning, and performed water washing and drying.

  Through the above-described steps, an electrode plate with a film was obtained in which a plurality of electrically independent electrodes as shown in FIG.

Next, this electrode plate with film is subjected to external shape processing and opening formation in advance, aligned with a reinforcing plate in which a thermosetting adhesive is formed at a desired position, stacked, pressurized, and heated, As shown in FIG. 3E, an electrode plate with a film having an insulating reinforcing plate provided with openings at positions corresponding to the electrodes was obtained.
A glass epoxy substrate was used for the reinforcing plate, and the desired processing was performed by pressing.
An epoxy adhesive was used as the thermosetting adhesive.

Then, as shown to Fig.4 (a), after irradiating the film of the obtained electrode plate with a film for 500 mJ or more of ultraviolet rays (UV), a film is peeled off, and a laminated body ( Current collector plate).
As the ultraviolet irradiation lamp, any lamp having an emission spectrum at wavelengths of 365 nm and 420 nm can be used, and the irradiation amount was adjusted according to the emission spectrum of the lamp.

1, 2 Electrode plate with film 11 Electrode plate 11a, 11b Electrode 11A Metal plate 12 Adhesive layer 13 Film 14 Reinforcing plate 15, 15a, 15b Opening 21 Ultraviolet ray 31, 31a, 31b Storage battery 41, 41a, 41b Resist pattern 50 Storage battery module 111 Electrode plate 111a, 111b Electrode 114 Reinforcing plate 131 Storage battery

Claims (4)

An electrode plate is provided on the film via an adhesive layer,
The adhesive layer is an ultraviolet peelable adhesive layer whose adhesive force is reduced by ultraviolet irradiation, or a heat peelable adhesive layer whose adhesive force is reduced by heat treatment,
The electrode plate has a configuration in which a plurality of electrically independent electrodes are arranged in a plane,
When the thickness of the electrode is T, and the shortest distance between the plurality of electrodes is S,
An electrode plate with a film, wherein T is in a range of 0.05 mm to 1.0 mm, and S / T is in a range of 0.5 to 20 inclusive. A region where the electrode is formed on the film,
In a plan view, the long side is a rectangular region having a length of 300 mm or more and 2000 mm or less,
The electrode plate with a film according to claim 1, wherein the electrode is formed in a form of being electrically connected in a length direction of the long side.   The electrode plate with a film according to claim 1 or 2, wherein the electrode plate is made of any one of aluminum, an aluminum alloy, copper, a copper alloy, and a stainless alloy.   The insulating reinforcing plate having an opening provided at a position corresponding to the electrode on a surface of the electrode plate opposite to the side on which the film is provided. The electrode plate with a film according to any one of claims 1 to 3.

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