Abstract: A nickel-metal hydride storage battery is provided capable of suppressing an increase of discharge reserve of a negative electrode and preventing lowering of battery characteristics. A nickel-metal hydride storage battery 100 of the present invention comprises a battery main part (an electrode plate group 150, an electrolyte, and others), a case 102 housing this battery main part, and a safety valve device 101 having an excessive pressure preventing function for preventing excessive rise of the internal pressure in the case 102 by discharging gas from the case 102 when the internal pressure in the case 102 exceeds a predetermined value.

Abstract: An alkaline storage battery has an electrode terminal that is inserted in a penetration hole, and disposed astride an inside of a battery case and an outside of the battery case, and fastened to a hole periphery portion via a packing. The negative terminal has a seal portion that, together with the hole periphery portion, clamps and compresses the packing to liquid-tightly seal the penetration hole. The seal portion includes an annular seal surface located facing the hole periphery portion, and a seal periphery surface located around the seal surface. The seal surface is protruded from the seal periphery surface toward the hole periphery portion. The surface roughness Ry of the seal surface of the negative terminal is 15 ?m or less.

Abstract: A battery module is constructed of an integral battery case which is constituted by forming a plurality of prismatic cell cases into a unitized body, wherein positive electrode plates and negative electrode plates laminated alternately upon one another with intervening separators are respectively accommodated in each of the cell cases, thereby constituting a plurality of cells, these cells being electrically connected in series. A plurality of such battery modules are arranged in a direction in which the electrode plates within each cell are laminated in a condition with coolant passages formed between the battery modules, and bound tightly together with end plates arranged at both ends in the direction of adjacent arrangement of the battery modules.

Abstract: A prismatic sealed battery has a prismatic battery case (3) which includes a plurality of prismatic containers (4) coupled in a row via partitions (5), electrode plate assemblies (8), and collectors (10) which are joined to lead portions on both sides of the electrode plate assemblies (8). Each container (4) contains the electrode plate assembly (8) to which said collectors 10 are joined. An opening (21) is formed in at least one side wall (20) of the prismatic battery case (3) and in a position where each partition (5) is disposed, in such a manner as to face the containers (4) on both sides, and a conductive connection member (23) disposed in the opening (21) is connected to the collectors (10, 10) on both sides of the partition (5). Since the current-carrying path between the electrode plate assemblies (8) becomes short, internal resistance decreases, and hence internal resistance per cell (2) is reduced. Even and full use of the whole electrode plate assembly (8) achieves higher power output.

Abstract: A sealed prismatic battery has a battery case made of a plurality of prismatic cell cases coupled together via partition walls. Electrode plate groups are accommodated together with liquid electrolyte in each of the cell cases. Each electrode plate group consists of alternately stacked-up positive and negative electrode plates with separators interposed therebetween, lead portions of positive and negative electrode plates being protruded on opposite sides. Collectors are bonded to these lead portions. Between the collectors and end walls (and/or partition walls) of the battery case are provided conductive plates that are connected to the collectors one or more than one location in their middle part so as to decrease the resistance between connection terminals and the electrode plate groups.

Abstract: An electrode plate unit capable of suppressing the internal short circuit caused by flashing that is formed on the end portion of a positive electrode plate and a battery using the same. The electrode plate unit includes a group of electrode plates in which a plurality of positive electrode plates and a plurality of negative electrode plates are laminated alternately via separators, a positive electrode collector plate connected to one side face of the group of electrode plates for connection to the positive electrode plate, and a negative electrode collector plate connected to another side face of the group of electrode plates for connection to the negative electrode plate, wherein the edge portion of the positive electrode plate is protruded from the edge portion of the negative electrode plate on the entire side face excluding the side face to which the negative electrode collector plate of the group of electrode plates is connected.

Abstract: A prismatic sealed rechargeable battery includes a substantially prismatic battery case that accommodates an electrode plate assembly and an electrolyte solution. The battery case is formed of metal. On a side face of the battery case, a thin plate is provided which has a plurality of protruding portions formed in parallel at appropriate intervals. The protruding portion and the side face form spaces opened at both ends therebetween. The thin plate is bonded to the side face of the battery case by making flat portions between the protruding portions into surface-contact with the side face, thereby improving cooling capability of the battery.

Abstract: A sealed prismatic battery has a battery case made of a plurality of prismatic cell cases coupled together via partition walls. Electrode plate groups are accommodated together with liquid electrolyte in each of the cell cases. Each electrode plate group consists of alternately stacked-up positive and negative electrode plates with separators interposed therebetween, lead portions of positive and negative electrode plates being protruded on opposite sides. Collectors are bonded to these lead portions. Between the collectors and end walls (and/or partition walls) of the battery case are provided conductive plates that are connected to the collectors one or more than one location in their middle part so as to decrease the resistance between connection terminals and the electrode plate groups.

Abstract: A battery pack is compos d of a plurality of battery modules, holding brackets, a tubular cover, and a fan. The battery module is composed of a plurality of sealed rechargeable batteries having a metal case, which are arranged in a row and integrally connected in series. The plurality of battery modules are arranged in parallel, and the holding brackets hold both ends of the battery modules in a direction perpendicular to a parallel direction. The tubular cover forms a coolant path by surrounding the periphery of the battery modules. The fan supplies coolant to the inside of the coolant path. In the battery pack with above structure, increase in the height thereof is prevented.

Abstract: A sealed battery (100) includes a power generation element (120), a battery case (110), and an external positive terminal (150) fixed to a first case wall (110a). Case side faces (110c, 110d) serve as external negative electrode portions providing an electrical connection to a negative electrode of the power generation element (120). The external positive terminal (150) has extended joint portions (155) extending in a direction perpendicular to the first case wall (110a). The extended joint portions (155) are laid to overlap from outside with and connected to the external negative electrode portions when the external positive terminal (150) of the sealed battery (100) is brought into contact with a second case wall (110b) of another sealed battery (100).

Abstract: A group of electrodes are accommodated in a prismatic cell case of a rechargeable battery. Intervening separators are provided between positive and negative electrode plates arranged alternately in parallel to long lateral walls of the cell case. The positive electrode plates each include a lead portion having a surface on which at least one lead plate is attached. Lateral edges of the positive electrode plates protrude beyond the negative electrode plates on one side, and lateral edges of the negative electrode plates protrude beyond the group of positive electrode plates on the opposite side. The protruding portions form the lead portions. Upper open ends of the cell cases are closed by an integral lid member.

Abstract: In a battery pack including rechargeable batteries arranged in parallel, a cooling medium path for allowing a cooling medium to horizontally flow be formed between the rechargeable batteries. A cooling medium delivery device for delivering the cooling medium to the cooling medium path is provided so as to reduce a height of the battery pack including a cooling device. The cooling medium delivery device is constituted by a pair of cooling medium introduction ducts provided on both right and left sides of the battery pack, each having delivery ports for delivering the cooling medium alternately in horizontally opposed directions to each of the cooling medium paths, and a cooling medium compression transport device for supplying the cooling medium to both of the cooling medium introduction ducts.

Abstract: In a battery pack including rechargeable batteries arranged in parallel, a cooling medium path for allowing a cooling medium to horizontally flow be formed between the rechargeable batteries. A cooling medium delivery device for delivering the cooling medium to the cooling medium path is provided so as to reduce a height of the battery pack including a cooling device. The cooling medium delivery device is constituted by a pair of cooling medium introduction ducts provided on both right and left sides of the battery pack, each having delivery ports for delivering the cooling medium alternately in horizontally opposed directions to each of the cooling medium paths, and a cooling medium compression transport device for supplying the cooling medium to both of the cooling medium introduction ducts.