A123 Systems Inc.

MA, United States

A123 Systems Inc.

MA, United States
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A material and method for a surface-treated electrode active material for use in a lithium ion battery is provided. The surface-treated electrode active material includes an ionically conductive layer comprising a multivalent metal present as a direct conformal layer on at least a portion of the outer surface of the electrode active material. The surface-treated electrode active material improves the capacity retention and cycle life as well as reduces undesirable reactions at the surface of the electrode active material.


Patent
A123 Systems Inc. | Date: 2017-01-11

An LFP electrode material is provided which has improved impedance, power during cold cranking, rate capacity retention, charge transfer resistance over the current LFP based cathode materials. The electrode material comprises crystalline primary particles and secondary particles, where the primary particle is formed from a plate-shaped single-phase spheniscidite precursor and a lithium source. The LFP includes an LFP phase behavior where the LFP phase behavior includes an extended solid-solution range.


Patent
A123 Systems Inc. | Date: 2016-05-06

The following description relates to systems and methods for a vehicle battery. The vehicle battery may be a Lithium-ion battery, and may comprise a plurality of prismatic shaped battery cells, arranged and stacked to form a series of battery cell groups, and where protective casings or partitioned chambers of a protective casing enclose each battery cell group. The protective casings, or component segments of a protective casing, may be coupled to one another by a series of ridges and mating grooves. A protective casing may alternatively comprise of a monolithic extrusion comprising a plurality of partitioned chambers. The protective casing may be configured to absorb a threshold compressive force without resulting in deformation of the battery cell groups.


Patent
A123 Systems Inc. | Date: 2015-09-02

A laminate electrochemical cell, comprising a stack of layers arranged to provides a positive electrode layer/separator layer/negative electrode layer/separator layer repeat unit, where the positive electrode layer comprises a porous composite positive electrode layer adhered to both sides of a positive current collector, said electrode layer comprising at least electroactive particles and a binder; the negative electrode layer comprises a porous composite negative electrode layer adhered to a both sides of a negative current collector, said electrode layer comprising at least electroactive particles and a binder; the separator layer comprises a porous composite separator layer comprising inorganic particles substantially uniformly distributed in a polymer matrix to form nanopores, wherein each separator layer is bonded to an adjacent electrode layer through a solvent weld at an interface between the separator layer and the electrode layer.


Patent
A123 Systems Inc. | Date: 2016-04-28

A material and method for a heat-treated polymer coated electrode active material for use in a lithium-ion battery is provided. The heat-treated polymer coated electrode active material includes a heat-treated polymer coating present as a direct conformal layer on at least a portion of the outer surface of the electrode active material. The surface-treated electrode active material improves the capacity retention, reduces gassing, and improves cycle life.


Patent
A123 Systems Inc. | Date: 2016-08-30

Systems and methods for balancing battery cells of a battery pack are disclosed. In one example, a charge imbalance is determined while battery cells operate in a high charge resolution voltage range. The charge imbalance determined during operation in the high charge resolution voltage range may be removed when the battery cells are operated in a low charge resolution voltage range. The system and method may be particularly useful for balancing battery cells that operate in the low charge resolution voltage range for a large portion of their operating time.


Patent
A123 Systems Inc. | Date: 2016-07-27

An LFP electrode material is provided which has improved impedance, power during cold cranking, rate capacity retention, charge transfer resistance over the current LFP based cathode materials. The electrode material comprises crystalline primary particles and secondary particles, where the primary particle is formed from a plate-shaped single-phase spheniscidite precursor and a lithium source. The LFP includes an LFP phase behavior where the LFP phase behavior includes an extended solid-solution range.


Systems and methods for assessing voltage threshold detection circuitry of individual battery cells within a battery pack supplying power to a vehicle are disclosed. One example system comprises, a plurality of battery cells within a battery pack, a plurality of voltage threshold detecting circuits detecting voltage of the plurality of battery cells, a voltage of a first battery cell of the plurality of battery cells coupled to a first voltage threshold detecting circuit of the plurality of voltage threshold detecting circuits, and a network that selectively couples a second battery cell to the first voltage detecting circuit while the first battery cell is coupled to the first voltage detecting circuit.


Patent
A123 Systems Inc. | Date: 2015-01-09

An electrochemical storage cell may comprise first and second electrode sheets wound around a cylindrical core forming a jellyroll structure, the first and second electrode sheets each comprising uncoated conductive edges parallel to end faces of the jellyroll structure, and coated opposing surfaces between the uncoated conductive edges, first and second separator sheets mechanically and electrically separating the coated opposing surfaces of the first and second electrode sheets and mechanically and electrically separating the cylindrical core and the coated opposing surfaces of the first electrode sheet, and slotted cutouts from the uncoated conductive edges, the slotted cutouts angularly co-located relative to the cylindrical core upon forming the jellyroll structure.


A rechargeable battery is designed with cells having a specific combination of anode, cathode, and electrolyte compositions to maintain long cycle life at extreme high temperatures and deliver high power at extreme low temperatures. These properties can significantly reduce or altogether eliminate the need for thermal management circuitry, reducing weight and cost. Applications in telecommunications backup, transportation, and military defense are contemplated.

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