TOYOTA BATTERY CO., LTD.

In a battery pack according to related art, it is difficult to easily replace a battery cell. A battery pack according to the present disclosure includes: a plurality of battery cells; a battery housing part configured to house the plurality of battery cells; and a plurality of vibration suppression plates each configured to apply a pressing force to the battery cells in a direction in which the battery cells are pressed against a bottom surface of the battery housing part, in which one of the vibration suppression plates is provided in at least one of the plurality of battery cells arranged in a row direction in which the plurality of battery cells are stacked, and all of the plurality of battery cells housed in the battery housing part are pressed by the plurality of vibration suppression plates.

An aspect of a battery pack according to the present disclosure is a battery pack including: a pond structure part in which a plurality of walls are formed so as to surround an area where the top surface of the heat dissipation projection is exposed is formed at a position corresponding to an electrode component attached to the battery cell, and the pond structure part is filled with a thermally conductive agent, the passage is formed so as to extend in the row direction in an area adjacent to the plurality of thermally conductive agent filling parts, and a thermally conductive agent amount control wall that faces the passage is formed in such a way that a height of the thermally conductive agent amount control wall is the lowest of the plurality of walls in each of the plurality of thermally conductive agent filling parts.

A control program according to the present disclosure causes a computer to execute: upper limit voltage setting processing for setting, a potential difference between the positive electrode open circuit potential curve and the negative electrode open circuit potential curve at a point corresponding to a state of charge at which an electrical characteristic in which deterioration rates of both a positive electrode and a negative electrode are reduced is obtained as an upper limit voltage; and lower limit voltage setting processing for setting, a potential difference between the positive electrode open circuit potential curve and the negative electrode open circuit potential curve at a point corresponding to a state of charge on a low state of charge side among states of charge at which an electrical characteristic in which deterioration rates of both the positive electrode and the negative electrode are reduced is obtained as a lower limit voltage.

A parameter adaptation program performs: model configuration processing for defining a hysteresis voltage model in which an equivalent circuit is configured by a resistance parameter and a capacitance parameter; pulse response measurement processing for acquiring at least one voltage parameter from a measured value of a pulse voltage of a secondary battery; resistance parameter setting processing for calculating a value of the resistance parameter based on the at least one voltage parameter; and capacitance parameter optimization processing for acquiring a voltage response value by supplying a current signal equal to a pulse current to the hysteresis voltage model including the resistance parameter R calculated in the resistance parameter setting processing, and optimizing a value of the capacitance parameter in the hysteresis voltage model so that the voltage response value matches a value of the at least one voltage parameter acquired in the pulse response measurement processing.

In a battery, a terminal member includes: a columnar portion; a head portion, outside an outer casing, having a larger diameter than a through hole of a lid; and an umbrella-shaped portion, more inside than a current collecting member, having a larger diameter than a through hole of the current collecting member to closely contact an inside surface thereof. A gasket includes: a plate-shaped portion between the lid and the head portion; and a cylindrical portion between a wall surface of the through hole of the lid and the columnar portion. An insulator includes: a plate-shaped portion between the lid and the current collecting member; and a cylindrical portion between the wall surface of the through hole of the lid and the columnar portion. Leading ends of the cylindrical portions close contact each other between the wall surface of the through hole of the lid and the columnar portion.

A method of producing an electrode assembly comprises: a stacking step to stack a positive electrode and a negative electrode with a separator interposed therebetween to form a stack; a winding step to wind the stack to form a wound body; and a pressing step to press the wound body to form a wound electrode assembly having a flat form. A press load in the pressing step is less than 140 kN. A thickness of the separator in the wound electrode assembly is from 16 μm to 20 μm. When the press load is denoted as A (kN), the thickness of the separator in the wound electrode assembly is denoted as B (μm), and a thickness of the negative electrode in the wound electrode assembly is denoted as C (μm), [A/(B/C)] is from 190 kN to 473 kN.

The power storage cell includes an electrode assembly and a case that houses the electrode assembly. The electrode assembly includes a first electrode. The first electrode includes an insulating support layer, and a first conductive layer and a second conductive layer that is formed on the insulating support layer. Each of the first conductive layer and the second conductive layer is formed of flaky metal powder.

A rechargeable battery simulator includes a storage device and a processor. The storage device stores model variables that define an electrochemical model of a rechargeable battery. The processor is configured to execute a concentration variable estimation process. The concentration variable estimation process includes estimating a concentration variable varied by current flowing through the rechargeable battery using an equation in which a predetermined model variable of the model variables has a fixed value. The concentration variable represents a concentration of a predetermined substance at a predetermined location in the rechargeable battery. The equation specifies time variation of the concentration variable.

A coating device includes a backup roll configured to transport a workpiece; a coating die configured to discharge a coating liquid onto the workpiece; a drive section capable configured to drive the backup roll; and a heat dissipation section configured to dissipate heat generated in the drive section.

A method according to the present disclosure includes: a state estimation processing of obtaining a charge/discharge current, a battery voltage, and a temperature to estimate state-of-charge and a state of a secondary battery; an automatic adaptation processing of updating battery parameters applied to a state estimation model used in the state estimation processing so as to be adapted to a current state of the secondary battery; and a suppression control processing of limiting an output of the secondary battery based on a result of estimation performed utilizing the state estimation model and executing a suppression control processing for prolonging the battery life of the secondary battery, the respective processing being implemented by automated computation performed by a computer, in which in the suppression control processing, execution of suppression control is refrained until the battery parameters show a degree of adaptation equal to or greater than a preset threshold.