US-20260128434-A1 - MULTIFUNCTIONAL TIRE AND PRODUCTION METHOD THEREFOR

Abstract

A multifunctional tire includes a tire and a device fixed to the tire. The device includes a substrate and a flat secondary battery connected to the substrate with a terminal. The secondary battery is covered by a resin. The secondary battery includes an exterior body and a positive electrode and a negative electrode disposed in the exterior body. The negative electrode contains a transition metal oxide as a negative electrode active material. The exterior body includes a positive electrode can having a bottomed cylindrical shape and a negative electrode can having a bottomed cylindrical shape. The negative electrode can faces the substrate. The secondary battery is disposed outside the substrate as viewed from a rotation center of the tire.

Inventors

• Tadayoshi Takahashi
• Tomohiro Ueda

Assignees

• PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Dates

Publication Date

20260507

Application Date

20230822

Priority Date

20221011

Claims (6)

1. 1 . A multifunctional tire comprising: a tire configured to rotate about a rotation center; and a device fixed to the tire, wherein the device includes a substrate and a flat secondary battery connected to the substrate via a terminal, and the flat secondary battery is covered by a resin, the flat secondary battery includes an exterior body, and a positive electrode and a negative electrode disposed in the exterior body, the negative electrode contains a transition metal oxide as a negative electrode active material, the exterior body includes a positive electrode can having a bottomed cylindrical shape and a negative electrode can having a bottomed cylindrical shape, the negative electrode can faces the substrate, and the flat secondary battery is disposed outside the substrate as viewed from the rotation center of the tire.
2. 2 . The multifunctional tire according to claim 1 , wherein the transition metal oxide is a composite oxide containing lithium and titanium.
3. 3 . The multifunctional tire according to claim 1 , wherein the negative electrode can is located between the positive electrode can and the substrate.
4. 4 . A method for producing a multifunctional tire, comprising: preparing a device including a substrate and a flat secondary battery; preparing a tire configured to rotate about a rotation center; and fixing the device to the tire, wherein the flat secondary battery is connected to the substrate via a terminal, and the flat secondary battery is covered by a resin, the flat secondary battery includes an exterior body, and a positive electrode and a negative electrode disposed in the exterior body, the negative electrode contains a transition metal oxide as a negative electrode active material, the exterior body includes a positive electrode can having a bottomed cylindrical shape and a negative electrode can having a bottomed cylindrical shape, the negative electrode can faces the substrate, and the fixing of the device to the tire includes fixing the device to the tire to allow the flat secondary battery to be disposed outside the substrate as viewed from the rotation center of the tire
5. 5 . The method according to claim 4 , wherein the transition metal oxide is a composite oxide containing lithium and titanium.
6. 6 . The method according to claim 4 , wherein the negative electrode can is located between the positive electrode can and the substrate.

Description

TECHNICAL FIELD The present disclosure relates to a multifunctional tire to which a device including a flat secondary battery is fixed, and a method for producing the multifunctional tire. BACKGROUND ART In recent years, a device for monitoring a state (for example, air pressure) of a tire or the like is attached to the tire. Such a device includes a battery serving as a power source. Various proposals have been made on a method for attaching the battery used in such a device. In Claim 1 of PTL 1 (Japanese Patent Application Laid-Open No. 2011 014452), “a method for attaching a flat battery used in a device including a substrate and attached to a tire, the method including disposing the flat battery inside the substrate as viewed from a rotation center of the tire” is described. Claim 1 of PTL 2 (Unexamined Japanese Patent Publication No. 2014-160660) describes “a method for attaching a flat battery used in a device including a substrate and attached to a rotating portion, in which the flat battery is obtained by combining a positive electrode can and a negative electrode can facing each other, the substrate and the flat battery face each other and are connected via a terminal, the electrode can, facing the substrate, out of the positive electrode can and the negative electrode can is a can where a deformation amount due to expansion of the flat battery is small, and the method comprises embedding the substrate and the flat battery in a resin”. Claim 1 of PTL 3 (International Publication No. WO 2017/155035) describes “a tire air pressure detection system disposed in a tire, the tire air pressure detection system including an air pressure detection device that detects an air pressure in the tire, and a secondary battery that supplies power to the air pressure detection device, in which the secondary battery is a lithium secondary battery including a negative electrode having a lithium alloy as an active material and a positive electrode”. CITATION LIST Patent Literature PTL 1: Unexamined Japanese Patent Publication No. 2011-014452PTL 2: Unexamined Japanese Patent Publication No. 2014-160660PTL 3: International Publication No. WO 2017/155035 SUMMARY OF THE INVENTION At present, for automated driving, a next generation tire monitoring system (TMS) that not only detects an air pressure of a tire but also senses various types of information such as an acceleration, wear, and a temperature has been studied. In the next generation tire monitoring system (TMS), since an information amount and a communication frequency remarkably increase, a capacity of a primary battery becomes insufficient. In PTL 1, a method for attaching a battery to a substrate in a device attached to a tire has been proposed as prevention of breakage of battery internal components due to impact and vibration. In PTL 2, a method for attaching a battery to a substrate in a device attached to a rotating portion for suppression of degradation of battery characteristics generated due to a centrifugal force and generated due to an influence on misalignment of a terminal from the substrate and cracking of the substrate due to expansion of the battery has been proposed. In PTL 3, a lithium secondary battery using a lithium alloy as a negative electrode active material for a tire pressure gauge has been proposed. Since the number of sensors and the like is increased compared to the related art, an attachment position of the secondary battery is important. In addition, a characteristic change generated due to charging and discharging of the secondary battery and the like also needs to be taken into consideration. A multifunctional tire according to the present disclosure does not require battery replacement, is suitable for monitoring a state of a tire, and has high long-term reliability. A multifunctional tire according to the present disclosure includes a tire configured to rotate about a rotation center; and a device fixed to the tire. The device includes a substrate and a flat secondary battery connected to the substrate via a terminal. The flat secondary battery is covered by a resin. The flat secondary battery includes an exterior body, and a positive electrode and a negative electrode disposed in the exterior body. The negative electrode contains a transition metal oxide as a negative electrode active material. The exterior body includes a positive electrode can having a bottomed cylindrical shape and a negative electrode can having a bottomed cylindrical shape. The negative electrode can faces the substrate. The flat secondary battery is disposed outside the substrate as viewed from the rotation center of the tire. A method for producing a multifunctional tire according to another aspect of the present disclosure comprises preparing a device including a substrate and a flat secondary battery, preparing a tire configured to rotate about a rotation center, and fixing the device to the tire. The flat secondary battery is connected to the substrate