JP6939183B2 - Battery module - Google Patents

Description

The present disclosure relates to batteries and battery modules.

Japanese Unexamined Patent Publication No. 2014-308791 (Patent Document 1) states that in an alkaline battery, the liquid leakage resistance can be maintained for a long period of time by coating a specific portion of the surface of the negative electrode current collector rod with a rubber sealant. .. Japanese Patent Application Laid-Open No. 2015-07730 (Patent Document 2) provides flame retardancy and heat resistance by containing a halogen-free flame retardant and an ion scavenger in the insulating coating constituting the insulated wire. It states that it can be improved.

Japanese Unexamined Patent Publication No. 2014-308791 Japanese Unexamined Patent Publication No. 2015-07730

As disclosed in Japanese Patent Application Laid-Open No. 2014-038791 (Patent Document 1), even if a configuration capable of maintaining liquid leakage resistance in a battery is adopted, when the battery is used for a long period of time, an electrolytic solution is used. May leak from the inside of the battery to the outside. If the electrolytic solution leaks, it may cause a short circuit or reduce the insulation resistance between the active parts.

An object of the present disclosure is to disclose a battery and a battery module having a configuration capable of suppressing the occurrence of a short circuit and a decrease in insulation resistance between each active part even if the electrolytic solution leaks. ..

The battery of the present disclosure seals an outer can having an opening, a power generation element housed in the outer can, an electrolytic solution injected into the outer can, and the opening of the outer can. A sealing member provided so as to cover the opening and a covering material provided so as to cover the portion where the sealing member seals the opening from the outside of the outer can. Of these, at least an ion trapping agent is provided in the portion provided so as to cover the portion from the outside of the outer can.

According to the battery having the above configuration, even if the electrolytic solution leaks from the inside of the outer can to the outside, the conductive solution (K ⁺ , Li ⁺ , Na ^+, etc.) derived from the electrolytic solution is effective by the ion trapping agent. By reducing the conductivity of the leaked electrolytic solution, it is possible to suppress the occurrence of a short circuit and the reduction of the insulation resistance between the active parts.

The battery module of the present disclosure includes a battery having a terminal portion and injected with an electrolytic solution, and a wiring member electrically connected to the terminal portion. The wiring member includes a conductive portion and the conductive portion. The conductive portion includes a coating portion that covers the periphery, and the conductive portion includes a portion that is exposed from the coating portion, and an ion scavenger is provided in the portion.

According to the battery module having the above configuration, even if the electrolytic solution leaks from the inside of the battery to the outside and the electrolytic solution reaches the terminal portion, the conductive solution derived from the electrolytic solution (K ⁺ , Li ⁺ , Na ^+, etc.) can be effectively captured by an ion trapping agent, and by reducing the conductivity of the leaked electrolyte, a short circuit may occur or the insulation resistance between the live parts may decrease. Can be suppressed.

According to the above configuration, even if the electrolytic solution leaks, it is possible to suppress the occurrence of a short circuit and the decrease in the insulation resistance between the active parts.

It is sectional drawing which shows the battery in Embodiment 1. FIG. It is sectional drawing which shows the battery in Embodiment 1. FIG. It is a perspective view which shows the disassembled state of the battery module in Embodiment 2. FIG. It is a perspective view which shows the battery module in another configuration of Embodiment 2. It is sectional drawing which shows the connection structure of the terminal part of the battery module and one end part of the wiring member in another structure of Embodiment 2. It is sectional drawing which shows the structure of the other end of the wiring member connected to the battery module in another structure of Embodiment 2.

The battery according to the embodiment will be described below with reference to the drawings. The same parts and equivalent parts may be given the same reference numbers and duplicate descriptions may not be repeated.

The following embodiments will be described based on an alkaline battery, which is an example of a battery. Alkaline battery is a general term for batteries containing an alkaline aqueous solution in an electrolytic solution. Alkaline batteries are, for example, nickel-metal hydride batteries, nickel-cadmium batteries, nickel-zinc batteries, and nickel-iron batteries. In the following description, an alkaline secondary battery will be disclosed as an example of the alkaline battery. The idea disclosed in the following embodiments is not limited to application to alkaline batteries and alkaline secondary batteries. The idea disclosed in the following embodiments can be applied to a so-called ion battery as long as the electrolytic solution used in the battery contains ions captured by an ion scavenger.

[Embodiment 1]
1 and 2 are a cross-sectional perspective view and a cross-sectional view showing the alkaline secondary battery 100 according to the first embodiment, respectively. The alkaline secondary battery 100 is a cylindrical battery. The alkaline secondary battery 100 may be a square battery or a laminated battery. The alkaline secondary battery 100 includes an outer can 10, a power generation element 20 (electrode group), an electrolytic solution 30, a sealing member 40, and a coating material 50.

The outer can 10 is formed in a bottomed cylindrical shape and has an opening 10H at an end. The bottom of the outer can 10 constitutes the positive electrode terminal 12 (FIG. 1). The outer can 10 may include a gas discharge valve, a current cutoff mechanism, and the like.

The power generation element 20 is housed in the outer can 10. The power generation element 20 includes a positive electrode 21, a negative electrode 22, and a separator 23. The power generation element 20 is configured by stacking a positive electrode 21, a separator 23, a negative electrode 22, and a separator 23 in this order, and further winding them in a spiral shape.

The electrolytic solution 30 is injected into the outer can 10. The electrolytic solution 30 contains an alkaline aqueous solution. The electrolytic solution 30 contains, for example, a solvent and a Li salt. The solvent is aprotic. The solvent may be, for example, a mixed solvent of cyclic carbonate and chain carbonate. The Li salt functions as a supporting electrolyte. The electrolytic solution may further contain various functional additives in addition to the solvent and the Li salt.

The sealing member 40 is provided so as to seal the opening 10H of the outer can 10. Specifically, the negative electrode terminal 14 and the support member 16 are arranged inside the opening 10H of the outer can 10. The portion of the outer can 10 forming the opening 10H is bent inward via the sealing member 40.

Between the inwardly bent portion of the outer can 10 and the negative electrode terminal 14 (gap), and between the inwardly bent portion of the outer can 10 and the support member 16 (gap), The sealing member 40 is arranged. The gap is closed by the presence of the sealing member 40, and the opening 10H of the outer can 10 is sealed. The support member 16 prevents the negative electrode terminal 14 from being deformed during sealing, and supports the sealing member 40 from the inside.

The covering material 50 is provided on the outside of the outer can 10. The covering material 50 has an electrical insulating property. As the coating material 50, for example, a heat-shrinkable tube integrally molded by combining a polyester resin and a heat conductive filler can be used. The covering material 50 is provided so as to cover the portion where the sealing member 40 seals the opening 10H from the outside of the outer can 10.

The electrolytic solution 30 filled in the outer can 10 may leak through the portion where the sealing member 40 seals the opening 10H. For example, the electrolytic solution 30 tries to leak through the portion P1 (FIG. 2) between the sealing member 40 and the negative electrode terminal 14, or the portion P2 between the sealing member 40 and the inner surface of the outer can 10. Attempts to leak through (Fig. 2). The covering material 50 is provided so as to cover these portions P1 and P2 from the outside of the outer can 10.

Of the covering material 50, a portion 52 (FIG. 2) in which the sealing member 40 seals the opening 10H (for example, portions P1 and P2) is provided so as to cover the outer can 10 from the outside. At least an ion scavenger is provided. The ion scavenger may be provided not only in this portion 52 but also in the entire coating material 50. The ion scavenger can effectively capture ^{K +} , Li ⁺ , Na ^+, etc. derived from the electrolytic solution 30.

The technical meaning of the term "provided" here includes the case where the member itself constituting the covering material 50 integrally contains an ion scavenger and the case where the covering material 50 is formed. Both the case where the ion scavenger is provided as a separate body on the surface of the member are included. That is, the form of the ion scavenger is not particularly limited. The ion scavenger can be powdery, sheet-like, net-like or the like. The ion scavenger may be used, for example, by being held on a resin substrate.

The ion scavenger may be an anion scavenger, a cation scavenger, or both ion scavengers. Both ion scavengers can capture both anions and cations. One type of ion scavenger may be used alone, or two or more types of ion scavengers may be used in combination. For example, an anion scavenger and a cation scavenger may be used in combination.

The ion scavenger may be a natural product or an artificial product. The ion scavenger may be an inorganic compound or an organic compound. The ion scavenger contains at least one selected from the group consisting of hydrotalcite, aluminum hydroxide, magnesium silicate, aluminum silicate, aluminum oxide, magnesium oxide, zirconium phosphate, antimony oxide, and bismuth oxide. It may be.

Commercially available ion scavengers may be used. Examples of commercially available ion scavengers include "Kyoward (registered trademark, the same applies hereinafter) 200, aluminum hydroxide-based scavenger, manufactured by Kyowa Kagaku Kogyo Co., Ltd.", "Kyoward 500, hydrotalcite-based scavenger (" Anion scavenger), Kyowa Kagaku Kogyo Co., Ltd. ”,“ Kyoward 600, magnesium silicate scavenger (both scavengers), Kyowa Kagaku Kogyo Co., Ltd. ”,“ Kyoward 700, aluminum silicate scavenger Agent (cation scavenger), manufactured by Kyowa Chemical Industry Co., Ltd. "," KW-2000 (trade name), aluminum oxide-magnesium oxide solid solution system ion scavenger (both ion scavengers), manufactured by Kyowa Chemical Industry Co., Ltd. "," DHT -4A (registered trademark), hydrotalcite-based scavenger (anion scavenger), manufactured by Kyowa Kagaku Kogyo Co., Ltd.), "IXE (registered trademark, the same applies hereinafter) -100, zirconium phosphate scavenger (positive) Ion scavenger), Toa Synthetic Co., Ltd. ”,“ IXE-300, Antimonium oxide ion scavenger (cation scavenger), Toa Synthetic Co., Ltd. ”,“ IXE-500, Bismus oxide ion scavenger (anion scavenger) Agent), Toa Synthetic Co., Ltd. ”,“ IXE-600, Antimonium Oxide-Vismus Oxide Ion Scavenger (both ion scavengers), Toa Synthetic Co., Ltd. ”,“ IXEPLAS (registered trademark, same below) -A1, Toa Synthetic Examples include "manufactured by IXEPLAS-A2, manufactured by Toa Synthetic Co., Ltd." and "IXEPLAS-B1, manufactured by Toa Synthetic Co., Ltd."

The alkaline secondary battery 100 of the first embodiment has the above configuration. The alkaline secondary battery 100 can be used, for example, as a driving power source for a hybrid vehicle (HV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), or the like. Not limited to these, the alkaline secondary battery 100 can be applied to any application.

Generally, when an alkaline battery is used for a long period of time, the electrolytic solution may leak from the inside of the outer can to the outside. If the electrolytic solution leaks, it may cause a short circuit or reduce the insulation resistance between the active parts.

On the other hand, according to the alkaline secondary battery 100 of the first embodiment, even if the electrolytic solution 30 leaks from the inside of the outer can 10 to the outside, the conductive solutions derived from the electrolytic solution (K ⁺ , Li ⁺ , Since Na ^+, etc.) can be effectively captured by the coating material 50, a short circuit occurs or the insulation resistance between the active parts is reduced by reducing the conductivity of the leaked electrolytic solution 30. It becomes possible to suppress this.

[Embodiment 2]
FIG. 3 is a perspective view showing a disassembled state of the battery module 200 according to the second embodiment. The battery module 200 includes a plurality of alkaline secondary batteries 100, cases 61, 62, 63, and a plurality of wiring members 64. The alkaline secondary battery 100 may have the same configuration as the alkaline secondary battery 100 according to the first embodiment described above.

The cases 61, 62, and 63 have insulating properties and are made of, for example, resin. The cases 61, 62, 63 can also function as a so-called bus bar case. Of the cases 61, 62, and 63, at least the portion holding (constraining) the plurality of alkaline secondary batteries 100 may be provided with an ion scavenger.

The wiring member 64 can function as a voltage detection line for detecting the voltage of the alkaline secondary battery 100, or can function as a temperature measurement line for measuring the temperature of the alkaline secondary battery 100. The wiring member 64 may be used as a so-called power cable used for transmitting or receiving electric power.

The wiring member 64 includes a conductive portion 65 that is electrically connected to the terminal portion of the alkaline secondary battery 100, and a covering portion 66 that covers the periphery of the conductive portion 65. The conductive portion 65 includes a portion exposed from the coating portion 66 (a wire portion connected to the terminal portion of the alkaline secondary battery 100), and the wire portion is provided with an ion scavenger. Of the wiring members 64, the covering portion 66 covering the conductive portion 65 may be provided with an ion scavenger.

According to the battery module 200 of the second embodiment, even if the electrolytic solution leaks from the alkaline secondary battery 100, conductive solutions (K ⁺ , Li ⁺ , Na ^+, etc.) derived from the electrolytic solution are provided in various places. Since it can be effectively trapped by the obtained ion trapping agent, it is possible to suppress the occurrence of a short circuit and the decrease in the insulation resistance between the active parts by reducing the conductivity of the leaked electrolytic solution 30. It becomes possible to do.

FIG. 4 is a perspective view showing the battery module 200 in another configuration of the second embodiment. The battery module 200 includes a plurality of alkaline secondary batteries 100, each housed in a housing 67, and a wiring member 64. One end 64A of the wiring member 64 is connected to a terminal 13 provided in the alkaline secondary battery 100. The other end 64B of the wiring member 64 is connected to the connector 68. The plurality of alkaline secondary batteries 100 are connected to the ECU 300 via the wiring member 64 and the connector 68.

FIG. 5 is a cross-sectional view showing a connection configuration between the terminal portion 13 and the one end portion 64A of the wiring member 64. With reference to FIGS. 4 and 5, a terminal fitting 13A is provided at one end 64A of the wiring member 64, and the terminal fitting 13A is fixed to the conductive portion 65 on the one end 64A side of the wiring member 64 by a caulking structure. Has been done. The terminal fitting 13A is fixed to the terminal portion 13 by using the fastener 13B. In the configuration, the conductive portion 65 includes a wire portion exposed from the coating portion 66 (here, a wire portion R1 crimped by the terminal fitting 13A), and the portion R1 is, for example, impregnated or coated. Depending on the treatment, an ion scavenger is provided.

FIG. 6 is a cross-sectional view showing the configuration of the other end 64B of the wiring member 64. With reference to FIGS. 4 and 6, the terminal fitting 13C is also provided on the other end 64B of the wiring member 64, and the terminal fitting 13C is the conductive portion 65 on the other end 64B side of the wiring member 64 due to the caulking structure. It is fixed to. The other end 64B of the wiring member 64 is fixed to the connector 68 via the terminal fitting 13C. In the configuration, the conductive portion 65 includes a wire portion exposed from the coating portion 66 (here, a wire portion R2 crimped by the terminal fitting 13C), and the portion R2 is, for example, impregnated or impregnated. An ion scavenger is provided by the coating process.

Even if the electrolytic solution leaks from the alkaline secondary battery 100 even with the above configuration, the conductive solution (K ⁺ , Li ⁺ , Na ^+, etc.) derived from the electrolytic solution is used by ion trapping agents provided in various places. Since it can be effectively captured, it is possible to suppress the occurrence of a short circuit and the decrease in the insulation resistance between the active parts by reducing the conductivity of the leaked electrolytic solution 30. ..

Although the embodiments have been described above, the above disclosure contents are examples in all respects and are not restrictive. The technical scope of the present invention is indicated by the claims and is intended to include all modifications within the meaning and scope equivalent to the claims.

10 Exterior can, 10H opening, 12 positive electrode terminal, 13 terminal part, 13A, 13C terminal fitting, 13B fastener, 14 negative electrode terminal, 16 support member, 20 power generation element, 21 positive electrode, 22 negative electrode, 23 separator, 30 electrolyte , 40 sealing member, 50 covering material, 52, P1, P2 part, 61, 62, 63 case, 64 wiring member, 64A one end, 64B other end, 65 conductive part, 66 covering part, 68 connector, 100 alkali Secondary battery (battery), 200 battery module, 300 ECU, R1, R2 wire parts.

Claims (5)

A battery that has a terminal and is injected with an electrolytic solution,
A wiring member electrically connected to the terminal portion is provided.
The wiring member includes a conductive portion and a covering portion that covers the periphery of the conductive portion.
The conductive portion includes a portion exposed from the coating portion, and an ion scavenger is provided in the portion.
The battery is
An outer can with an opening and
The power generation element stored in the outer can and
The electrolytic solution injected into the outer can and
A sealing member provided so as to seal the opening of the outer can, and
A coating material provided so as to cover a portion of the sealing member sealing the opening from the outside of the outer can is provided.
An ion scavenger is provided at least in a portion of the coating material provided so as to cover the portion from the outside of the outer can.
Battery module. The outer can is formed in a bottomed tubular shape including a bottom portion and a tubular portion.
The opening is formed at an end of the cylindrical portion opposite to the bottom side.
Members constituting the electrode terminals are arranged inside the cylindrical portion in the radial direction.
The sealing member is arranged so as to close a gap between the inner surface of the tubular portion and the outer peripheral edge of the member constituting the electrode terminal.
The battery module according to claim 1. The tubular portion has a curved portion that is bent from the outside to the inside in the radial direction as it approaches the end forming the opening from the bottom side.
The outer peripheral edge of the member constituting the electrode terminal is arranged closer to the bottom portion than the position of the end portion forming the opening portion in the curved portion.
The battery module according to claim 2. The member constituting the electrode terminal has an outer surface facing the side opposite to the bottom side.
The tip of the sealing member on the opposite side of the bottom is arranged so as to close the gap between the inner surface of the curved portion and the outer surface of the member constituting the electrode terminal.
The battery module according to claim 3. The covering material covers the outer surface of the outer can and also covers the outer surface of the curved portion, and the tip of the covering material is in contact with the outer surface of the member constituting the electrode terminal.
The battery module according to claim 4.

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