Prime Planet Energy & Solutions Patente

A method of manufacturing a battery cell (10S) including an electrode body (10) including electrode foils (1) having active material layer formed portions (11) and active material layer non-formed portions (12), and a current collecting terminal joined to the active material layer non-formed portions (12) is provided. The method includes a first step of causing the electrode foils (1) to contact with and adhere to each other in the active material layer non-formed portions (12), to form a reduced thermal resistance portion (RT) of the electrode foils (1) in which thermal resistance in a contact adhered portion of the electrode foils (1) is lower than that in a discrete portion of the electrode foils (1), and a second step of joining the electrode foils (1) and the current collecting terminal by laser welding while the reduced thermal resistance portion (RT) is in contact with the current collecting terminal to connect a nugget boundary of a laser welded portion (LY) to the reduced thermal resistance portion (RT).

An electrical energy storage module (500) disclosed herein includes first and second electrical energy storage devices (100), and a spacer (200). The spacer (200) includes a base part (290), a first uneven structure (210) that is provided on a first surface (290Rr) of the base part (290) and includes a plurality of first protrusion parts (210p) and a first depression part (210r), and a second uneven structure (220) that is provided on a second surface (290F) of the base part (290) and includes a second protrusion part (220p). The second protrusion part (220p) of the second uneven structure (220) is provided at a position corresponding to the first depression part (210r) of the first uneven structure (210).

The negative electrode of the secondary battery of a present disclosure is a negative electrode for secondary battery that includes a negative electrode current collector, and a negative electrode active material layer supported by the negative electrode current collector. The negative electrode active material layer includes a lower layer positioned at a side of the negative electrode current collector and an upper layer positioned at a surface side, the upper layer contains a first graphite particle and a first Si-containing particle, as a negative electrode active material, and the lower layer contains a second graphite particle and a second Si-containing particle, as the negative electrode active material. Then, a mean circularity C1 of the first Si-containing particle is larger than a mean circularity C2 of the second Si-containing particle.

The present disclosure provides a new method capable of efficiently collecting Ni, Co, and Mn from battery waste containing Ni, Co, and Mn. A method for recycling a positive electrode material according to the present disclosure includes: a Mn leaching step of leaching Mn into an aqueous phase by performing ammonia leaching on battery waste containing Ni, Co, and Mn under a condition that a Mn leaching rate is 70% or more, and a ratio of the Mn leaching rate is 65% or more with respect to a total of a Ni leaching rate, a Co leaching rate, and the Mn leaching rate; and a Ni and Co leaching step of leaching Ni and Co into an aqueous phase by performing ammonia leaching on a solid residue obtained in the Mn leaching step under a condition that a Mn leaching rate is less than 1%.

The present disclosure provides a new method capable of separating Li and Al from waste of at least a positive electrode. A method for recycling a positive electrode material according to the present disclosure includes bringing waste of at least a positive electrode containing Li and Al into contact with water under presence of pressurized CO<2> to allow Li and Al to leach into the water.

Provided is a negative electrode that contains Si-containing particles and graphite particles, and causes less swelling when a secondary battery is repeatedly charged and discharged. The negative electrode of a secondary battery of the present disclosure includes a negative electrode current collector, and a negative electrode active material layer supported by the negative electrode current collector. The negative electrode active material layer includes a first layer located on a surface layer part side, and a second layer located on a negative electrode current collector side. The first layer contains first graphite particles and first Si-containing particles. The second layer contains second graphite particles and second Si-containing particles. An aspect ratio of the first Si-containing particles is larger than an aspect ratio of the second Si-containing particles. The aspect ratio of the first Si-containing particles is 4.0 to 10.0. The aspect ratio of the second Si-containing particles is 1.0 to 3.0.

Provided is a technique to suppress a swell of the negative electrode. In the negative electrode disclosed herein, a negative electrode active material layer includes a first layer at a negative electrode current collector side and a second layer at a surface layer side. The first layer contains first Si-containing particles. The second layer contains second Si-containing particles. A Si content rate of the second Si-containing particles is smaller than a Si content rate of the first Si-containing particles. Each of the first Si-containing particles and the second Si-containing particles include a LiF coating layer. A second peak intensity ratio relating to a LiF of the second Si-containing particles is smaller than a first peak intensity ratio relating to the LiF of the first Si-containing particles. A difference between the first peak intensity ratio and the second peak intensity ratio is 0.050 to 1.00.

A negative electrode (60) containing Si-containing particles (14, 16) and graphite particles (12) and being capable of suppressing capacity degradation when a secondary battery is repeatedly charged and discharged is provided. The negative electrode of a secondary battery of the present disclosure includes a negative electrode current collector (62), and a negative electrode active material layer (64) supported by the negative electrode current collector. The negative electrode active material layer contains graphite particles, first Si-containing particles (14), and second Si-containing particles (16). The content rate of Si in the first Si-containing particles is smaller than the content rate of Si in the second Si-containing particles. When a density of a molded body obtained by uniaxially pressurizing and molding 1 g of particles at 25°C and at 60 MPa into a tablet having a diameter of 20 mm is defined as a consolidation density, the consolidation density of the first Si-containing particles is 0.9 g/cm<3> or more, and that of the second Si-containing particles is less than 0.9 g/cm<3>.

Provided is a technique to suppress a capacity maintenance rate reduction. A negative electrode disclosed herein includes a negative electrode active material layer including a first Si-containing particle and a second Si-containing particle. When an expansion rate S2 of the second Si-containing particle after an electrical charge A with respect to one before the electrical charge A is treated as 1, an expansion rate S1 of the first Si-containing particle after the electrical charge A with respect to one before the electrical charge A is more than 0.3 and not more than 0.9. When the mean particle diameter (D50) of the first Si-containing particle is treated as 1, the mean particle diameter (D50) of the second Si-containing particle is more than 0.1 and not more than 1.

Provided is a negative electrode (60) that contains Si-containing particles (14, 18) and graphite particles (16), and causes less swelling when a secondary battery is repeatedly charged and discharged. The negative electrode of a secondary battery of the present disclosure includes a negative electrode current collector (62), and a negative electrode active material layer (64) supported by the negative electrode current collector. The negative electrode active material layer includes a first layer (64a) located on a surface layer part side, and a second layer (64b) located on a negative electrode current collector side. The first layer contains first graphite particles and first Si-containing particles (14). The second layer contains second graphite particles and second Si-containing particles (18). The content rate of Si in the first Si-containing particles is smaller than the content rate of Si in the second Si-containing particles. When a density of a molded body obtained by uniaxially pressurizing and molding 1 g of particles at 25°C and at 60 MPa into a tablet having a diameter of 20 mm is defined as a consolidation density, a consolidation density of the first Si-containing particles is 0.9 g/cm<3> or more and a consolidation density of the second Si-containing particles is less than 0.9 g/cm<3>.

A memory storage unit of a battery system separately stores separately storing a start-up program related to starting up of a measuring means, a measurement program related to a measurement, and a state calculation program related to calculating of a battery state of a battery cell. A controller executes a first secure boot for a first program including the start-up program and thereafter executes a process contained in the first program. While the controller is executing the process contained in the first program, the controller executes a second secure boot for a second program including the measurement program or the state calculation program. The controller executes a process contained in the second program after the process of the first program is executed and the second secure boot is executed.

The present disclosure provides a manufacturing method for an electrical energy storage device (100) including an electrode body (20), a case (10), a first electrode terminal (30) attached to a bottom wall (12a) of the case (10), and a spacer (80). This manufacturing method includes a step of integrating a first current collecting member (50) attached to the electrode body (20) with the spacer (80), a step of inserting the electrode body (20) integrated with the spacer (80) into a case main body (12), and a step of joining the first current collecting member (50) and the first electrode terminal (30).

A negative electrode containing Si-C composite particles (10) and graphite particles (14), and capable of suppressing capacity degradation when a secondary battery is repeatedly charged and discharged is provided. The negative electrode of a secondary battery of the present disclosure includes a negative electrode current collector (62), and a negative electrode active material layer supported by the negative electrode current collector. The negative electrode active material layer contains graphite particles and Si-C composite particles as a negative electrode active material. Each of the Si-C composite particles includes a porous skeleton (11) made of carbon, and Si-containing particles located in voids (11a) of the porous skeleton. A coating (13) including LiF is formed on at least a part of an outer surface of each of the Si-C composite particles.

The negative electrode of the secondary battery includes a negative electrode current collector and a negative electrode active material layer that is supported by the negative electrode current collector and that contains a negative electrode active material. The negative electrode active material layer includes an upper layer and includes a lower layer. The negative electrode active material contains at least a graphite particle, and a Si-containing particle in which a carbon and a Si are compounded to be composite. A response area size of the negative electrode active material contained in the upper layer is smaller than a response area size of the negative electrode active material contained in the lower layer, and a Si amount of a first Si-containing particle contained in the upper layer is smaller than a Si amount of a second Si-containing particle contained in the lower layer.

An electrical energy storage device (100) disclosed herein includes an electrode body (20) including a first electrode (22), a case (10), and a first electrode terminal (30) electrically connected to the first electrode (22) through a first conductive member (50). The case (10) includes a case main body (12) with a bottomed tubular shape that includes a bottom wall (12a) and an opening (12h) facing the bottom wall (12a), and a sealing plate (14) that seals the opening (12h) of the case main body (12). The first electrode terminal (30) is attached to the bottom wall (12a) and includes a penetration hole (30h). The first conductive member (50) is inserted into the penetration hole (30h) and joined to the first electrode terminal (30).

The present disclosure provides a manufacturing method for an electrical energy storage device (100) including an electrode body (20), a case (10), and a first electrode terminal (30) attached to a bottom wall (12a) of the case (10). This manufacturing method includes a step of electrically connecting a first current collecting member (50) to the electrode body (20), a step of inserting the electrode body (20) into the case main body (12) and disposing at least a part (52) of the first current collecting member (50) into a first concave part (30r) of the first electrode terminal (30), and a step of delivering an energy beam (LB) from a side of the first electrode terminal (30), thereby joining by welding the part of the first current collecting member (50) that is disposed inside the first concave part (30r) to the first electrode terminal (30).

Provided is a technique to suppress a reduction in a capacity maintenance rate. In the negative electrode disclosed herein, a negative electrode active material layer contains first Si-containing particles and second Si-containing particles. When an expansion rate S2 of the second Si-containing particles is treated as 1, an expansion rate S1 of the first Si-containing particles is more than 0.3 and not more than 0.9. The first Si-containing particles and the second Si-containing particles include LiF coating layers. A second peak intensity ratio of the second Si-containing particles is larger than the first peak intensity ratio of the first Si-containing particles.

A method of manufacturing a non-aqueous electrolyte secondary battery includes the steps of obtaining a battery assembly, charging, and sealing. The battery assembly includes an electrode body, a non-aqueous electrolyte solution, and a battery case including a through hole. The step of charging involves charging the battery assembly. The step of sealing involves sealing the through hole with a sealing member after the charging step. In the step of charging, the charging is performed under a charging condition that causes a temperature of a gas inside the battery case increases. The step of sealing is performed while keeping the temperature inside the battery case having been increased. After the step of sealing, the temperature inside the battery case decreases, and the gas inside the battery case contracts, to thereby cause a contraction and/or an internal pressure decrease of the battery case.

A battery pack (1) includes: a plurality of battery modules (20) each including a plurality of battery cells (2) arranged in a first direction; and a case (40) that accommodates the plurality of battery modules (20), wherein the case (40) includes a case main body (43) having a bottom portion (41) and a side wall portion (42) that surrounds a periphery of the bottom portion (41), a cover body (44) that covers an opening (43a) of the case main body (43), and a partition plate (45) that partitions a battery module (20) disposed on the bottom portion (41) side and a battery module (20) disposed on the cover body (44) side, and by fixing the partition plate (45) to the side wall portion (42), one battery module (20) is disposed between the partition plate (45) and the bottom portion (41), and another battery module (20) is disposed between the partition plate (45) and the cover body (44).

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