Abstract: A battery module 100 includes a plurality of cells 10 arranged in a grid array. The cells 10 arranged in a row direction are connected together in parallel by a first connecting member 20. The cells 10 arranged in a column direction are connected together such that the cells 10 adjacent to each other in the column direction are connected together in series by a second connecting member 30. When an internal short-circuit occurs in any one of the cells 10, the first connecting member 20 connected to the cell 10 in which the internal short-circuit has occurred is melted by Joule heat generated due to a short-circuit current flowing into the cell 10 in which the internal short-circuit has occurred from the other cells 10 in which no internal short-circuit occurs via the first connecting member 20.

Abstract: Provided is a deterioration determination circuit configured by including: an SOC detection unit for detecting an SOC of a secondary battery; an internal resistance detection unit for detecting an internal resistance value of the secondary battery; a first determination unit for determining the status of deterioration of the secondary battery based on the internal resistance value detected by the internal resistance detection unit when the SOC detected by the SOC detection unit is within a range of a pre-set first range; a second determination unit for determining the status of deterioration of the secondary battery based on the internal resistance value detected by the internal resistance detection unit when the SOC detected by the SOC detection unit is within a range of a pre-set second range as a range of an SOC, in which a variation of the internal resistance of the second battery in relation to a variation of the SOC of the secondary battery is different from the first range; and a final determination un

Abstract: Provided is a battery pack in which the production of heat due to passage of current in a connector for connecting secondary batteries in parallel is made uniform to increase service life and reduce maintenance costs. A positive terminal connector 14 comprises a connector 14 with through-holes 18. The connector 14 is divided into two regions: a distant region which is distant from the portion connected to an external terminal; and a close region which is close to the connection portion and has the same area as the distant region. The connector 14 is formed so that the open area ratio of the distant region is greater than that of the close region. Thus, the electrical resistance of the close region can be made smaller than that of the distant region. Therefore, the production of heat due to passage of current in the close region can be suppressed.

Abstract: A battery module includes a battery unit, a housing, a lid, and a heat-absorbing member. The battery unit includes two or more battery cells. The housing includes a storage part having an open end on at least one surface, and the storage part stores the battery unit. The lid has an opened part, and covers the open end of the housing. The heat-absorbing member is provided in contact with each side surface of each battery unit, and encloses heat-absorbing agent made of liquid or gel fluid.

Abstract: A battery abnormality detection circuit includes: a SOC detection unit that detects a SOC of a secondary battery; an internal resistance detection unit that detects an internal resistance value of the secondary battery; a first state acquisition unit that acquires a first SOC and a first resistance value at a predetermined first timing; a second state acquisition unit that acquires a second SOC and a second resistance value at a second timing a storage unit that stores in advance relationship information indicating a correspondence relationship between a SOC and an internal resistance value of the secondary battery; a reference variation value setting unit that sets a reference variation value indicating an amount of variation from an internal resistance value corresponding to the first SOC to an internal resistance value corresponding to the second SOC on the basis of the relationship information stored in the storage unit; and a determination unit that determines that an abnormality has occurred in the seco

Abstract: Provided is a battery pack in which the production of heat due to passage of current in a connector for connecting secondary batteries in parallel is made uniform to increase service life and reduce maintenance costs. A positive terminal connector 14 comprises a connector 14 with through-holes 18. The connector 14 is divided into two regions: a distant region which is distant from the portion connected to an external terminal; and a close region which is close to the connection portion and has the same area as the distant region. The connector 14 is formed so that the open area ratio of the distant region is greater than that of the close region. Thus, the electrical resistance of the close region can be made smaller than that of the distant region. Therefore, the production of heat due to passage of current in the close region can be suppressed.

Abstract: A current collector includes a metal foil with a plurality of through-holes formed therein. The metal foil is divided into two regions of: a distant region distant from a connection portion to be connected to an external terminal; and a close region being close to the connection portion and having the same area as the distant region. The open area ratio of the distant region of the metal foil is larger than that of the close region. Thus, the electrical resistance of the close region is smaller than that of the distant region. Therefore, production of heat in the close region due to passage of current can be suppressed.

Abstract: A non-aqueous electrolyte battery has a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode has a high-capacity positive electrode portion with a plate area per capacity of smaller than 200 cm2/Ah, and a high-power positive electrode portion with a plate area per capacity of 200 cm2/Ah or larger. The non-aqueous electrolyte battery is advantageous in providing a battery, with use of a single kind of non-aqueous electrolyte battery, which simultaneously satisfies the requirements on high-capacity characteristics capable of performing a long-term continuous discharge, and on high-power characteristics capable of performing a pulse discharge at a large current, without using a hybrid power supply unit which has multiple kinds of batteries and requires a complex control system.

Abstract: The battery module includes: a plurality of batteries; a housing 50 in which the plurality of batteries are aligned and stored; and a cooling pipe 70 provided along the plurality of batteries in the housing 50, the cooling pipe 70 being filled with a cooling medium, wherein the cooling pipe 70 is made of a material which melts when the temperature of the battery reaches or exceeds a predetermined temperature.

Abstract: The battery module includes a plurality of battery units, a housing, a wiring board, and a lid. The battery unit is composed of one or more battery cells each having a vent mechanism. At least one surface of the housing is an open end. The housing has a plurality of storage parts partitioned by one or more partition walls. Each battery unit is stored in each storage part. The wiring board covers the open end of the housing, is disposed at the vent mechanism side of the cell, and has connection terminals connected to the battery units. The lid covers the open end of the housing and the wiring board, and has an open part. Through holes are provided on the wiring board in positions facing the battery units and in a different region from that of the connection terminals.

Abstract: A hybrid power supply unit, comprises a high-capacity nonaqueous electrolyte battery group and a high-power nonaqueous electrolyte battery group different in discharge characteristics connected to each other in parallel. The high-capacity nonaqueous electrolyte battery group has a 0.2 C discharge capacity per cell greater than that of the high-power nonaqueous electrolyte battery group, and the high-power nonaqueous electrolyte battery group has a rate of 5 C discharge capacity per cell to 0.2 C discharge capacity per cell (5 C discharge capacity/0.2 C discharge capacity) greater than that of the high-capacity nonaqueous electrolyte battery group.

Abstract: A charge control circuit that controls a charging section which charges a secondary battery by supplying a charging current to the secondary battery.

Abstract: There are provided at least one aqueous secondary battery and at least one nonaqueous secondary battery having a smaller capacity than that of the aqueous secondary battery. The aqueous secondary battery and the nonaqueous secondary battery are connected in series to constitute a battery pack.

Abstract: Provided is an imbalance identifying circuit, including: a voltage detection unit for detecting a terminal voltage in each of a plurality of accumulators; a gradient acquisition unit for performing gradient information acquisition processing of suspending charge when the plurality of accumulators are being charged and acquiring, from each of the terminal voltages detected by the voltage detection unit during the suspension of charge, voltage gradient information showing an amount of change per predetermined time of each of the terminal voltages; and an imbalance identification unit for identifying whether an imbalance of the amount of charge in the plurality of accumulators has occurred by using a plurality of pieces of voltage gradient information corresponding to each of the terminal voltages acquired by the gradient acquisition unit.

Abstract: A battery internal short-circuit detecting device has: a battery temperature detection unit for detecting a battery temperature Tr; an ambient temperature detection unit for detecting an ambient temperature Te; an average heating value detection unit for detecting an average value Pav of battery heating values per predetermined first period ?W1, which are generated by discharging or charging the battery; a battery temperature estimation unit for obtaining a battery temperature Tp estimated to be reached after a lapse of a predetermined second period ?W2 since the detection of the average value Pav of the heating values, based on the average value Pav of the heating values and the ambient temperature Te; and an internal short-circuit determination unit for determining that an internal short circuit has occurred when the actual battery temperature Tr after the lapse of the second period ?W2 is equal to or greater than the sum of the estimated battery temperature Tp and a predetermined coefficient ?.

Abstract: A non-aqueous electrolyte secondary battery includes an electrode assembly formed by winding positive and negative electrodes, and an insulating layer together. Each of the electrodes has a core sheet and mixture layers formed on both sides of the sheet. The insulating layer electrically insulates the electrodes. At least one of the electrodes includes a core-exposed portion continuous parallel to the winding direction. Each of the mixture layers has an inclined weight region where the amount of mixture per unit area decreases toward the core-exposed portion, and a constant weight region in which the amount of mixture per unit area is constant. The inclined weight region has a width of not more than 0.2 of the width of the mixture layers and has an average mixture density of not less than 40% and not more than 99% of the mixture density of the constant weight region.

Abstract: An internal short-circuit detecting device for detecting an internal short circuit of a battery being subjected to constant current charge using a constant current amount (I) has: a voltage detection unit for detecting a terminal voltage of the battery; a terminal voltage acquisition unit for acquiring a terminal voltage (V1), as predetermined by the voltage detection unit, at a starting point of a first period (?W1) and a terminal voltage (V2) at an ending point; a voltage increase amount calculation unit for calculating an actual increase amount (?V3) of the terminal voltage of the first period (?W1) from the terminal voltages (V1 and V2); a voltage increase amount prediction unit for calculating a predicted increase amount (?V4) of the terminal voltage for the period when charging is performed using the current amount (I) for the first period (?W1); and an internal short-circuit determination unit for determining that the internal short circuit is generated when the actual increase amount (?V3) is equal to

Abstract: A battery internal short-circuit detection apparatus includes: a voltage detection unit for detecting a terminal voltage of the battery; a current detection unit for detecting a discharging current of the battery; a voltage drop and recovery detection unit for detecting a momentary voltage drop of the battery and a recovery from the voltage drop, in response to a result of detection performed by the voltage detection unit; and a determination unit for determining that an internal short circuit has occurred, when a maximum value of the discharging current detected by the current detection unit between the voltage drop and the recovery is equal to or lower than a threshold current.

Abstract: Positive and negative electrodes include exposed current collector portions at both lengthwise ends, and these exposed current collector portions are bent such as to protrude from the widthwise edge of the electrodes to form welding pieces. The positive and negative electrodes and a separator interposed therebetween are wound around into a flat shape having an ellipsoidal cross section. The welding pieces of the positive and negative electrodes protruding from opposite sides of the wound electrodes are welded together with respective leads. According to this configuration, a simple but high-quality current collector design capable of stable electrical connection in a high power output prismatic electrochemical element is provided.

Abstract: The present invention aims to quickly charge a non-aqueous electrolyte secondary battery including a heat-resistant layer between a negative electrode and a positive electrode. A method according to the present invention for charging a non-aqueous electrolyte secondary battery including a heat-resistant layer between a negative electrode and a positive electrode is provided with a step of performing pulse charge on the secondary battery, a step of detecting a change amount of a cell voltage associated with a change in the concentration polarization of the non-aqueous electrolyte as a polarization voltage, and a step of terminating the pulse charge when the polarization voltage increases to or above a predetermined threshold value. According to the present invention, it is possible to quickly charge the non-aqueous electrolyte secondary battery including the heat-resistant layer between the negative electrode and the positive electrode at such a borderline level as not to cause overcharge.