Patent DE-102012210140-A1 (DE)
Title: Lithium ion battery, used in motor vehicle e.g. plug-in-hybrid vehicle, comprises battery cell string that comprises positive and negative terminals and battery cells, and a resistor string with resistance units connected between terminals
Inventor: HAUG KARSTEN
IPC: B60L50/64
Filed: 2012-06-15
Abstract: The battery comprises a battery cell string. The battery cell string comprises a positive (12) and a negative terminal (14) and a number n of the battery cells (10), where n is a natural number of >= 2 and the n battery cells are connected in series between the positive and negative terminals. A battery cell housing includes a positive and a negative electrode. The battery cells are configured such that the electrodes are electrically insulated from the battery cell housing. The battery further comprises a resistor string with n number of resistance units (30). The battery comprises a battery cell string. The battery cell string comprises a positive (12) and a negative terminal (14) and a number n of the battery cells (10), where n is a natural number of >= 2 and the n battery cells are connected in series between the positive and negative terminals. A battery cell housing includes a positive and a negative electrode. The battery cells are configured such that the electrodes are electrically insulated from the battery cell housing. The battery further comprises a resistor string with n number of resistance units (30), which are connected between the positive and negative terminals of the battery cell string in series. The battery cells and the resistance units have m numbers of counting indexes, where m is a natural number including 1 to n. The cell and the resistance means, which are connected directly to the negative terminal, have counting index that is 1, and the battery cell housing of an m-th cell is conductively connected with the resistance string before or after the m-th resistance unit is connected in series with the resistance unit before or after the m-th resistor unit. The resistance unit has a resistance value of >= 100 Momega . The resistance unit comprises a combination of a resistance components, a Zener diode connected with the resistance component in series, and a composite material comprising plastic material and electrically conductive particles. The plastic material has a melting temperature of 55-65[deg] C, and is greater than a melting temperature of the resistance value of the resistance unit. The resistance unit clamped between two battery cells is the m-th resistance unit. The m-th resistance unit having a (m +1) th or a (m-1) th resistance unit is connected in series via a cell connector such that a battery is formed. The resistance unit is formed as a film and an adhesive tape. An electrically insulating separator element made of plastic, ceramic or glass fibers, is embedded in the resistance unit, or forms a frame in the resistance unit. The separating element has a higher melting point than the plastic material of the resistance unit. The positive electrode of the m-th battery cell is electrically conductively connected with the negative electrode (24) of the (m+1) th cell via the cell connector, and the mth and the (m+1) th resistance units are non-positively or positively and/or materially connected with the cell connectors, and are electrically insulated from the cell connector.