A battery module according to an embodiment of the present invention is composed of a plurality of battery cells. The battery module includes one positive (+) output terminal formed by connecting the plurality of battery cells, a field effect transistor (FET) provided on a current path between the positive (+) output terminal and an external device to block charging or discharging of a battery module, a protection integrated circuit (IC) chip for controlling the FET, and a high temperature detector for detecting whether the battery module is above a predetermined temperature and including a plurality of positive temperature coefficient (PTC) thermistors connected in series with each other.

The present disclosure provides a battery pack including: a plurality of battery cells; a protective circuit module arranged on a side of the plurality of battery cells and including at least one through-hole; an electrode tab inserted into the at least one through-hole and electrically connecting the plurality of battery cells to the protective circuit module; a temperature sensing unit arranged on the protective circuit module; and a heat transfer member connected to a portion of the electrode tab inserted into the at least one through-hole and to the temperature sensing unit and transferring heat from the electrode tab to the temperature sensing unit.

A battery module for use in a battery pack is disclosed. The battery module (12, 12′) comprises a plurality of battery cells (24, 25) and a sensing circuit (62) extending across the battery cells. A monitoring unit (46) is connected to the sensing circuit. The monitoring unit comprises a continuity detector (66) arranged to detect a break in continuity of the sensing circuit (62). This can allow a thermal event occurring in one of the plurality of cells to be detected.

The present invention relates to a positive electrode plate and an electrochemical device. The positive electrode plate comprises a current collector, a positive active material layer and a safety coating disposed between the current collector and the positive active material layer, wherein the safety coating comprises a polymer matrix, a conductive material and an inorganic filler, wherein the polymer matrix comprises at least two types of polymer materials, and the first type of polymer material is fluorinated polyolefin and/or chlorinated polyolefin, and the solubility of the second type of polymer material in oil solvent is smaller than the solubility of the first type of polymer material; and the weight percentage of the first type of polymer material relative to the total weight of the polymer matrix, the conductive material and the inorganic filler is 17.5% or more. The positive electrode plate improves high temperature safety of electrochemical device.

A battery includes one or more stacks, an outer packaging body, a lead terminal, and a plurality of overcurrent breaking portions. The one or more stacks each include a positive electrode including a positive electrode current collector, an electrolyte, and a negative electrode including a negative electrode current collector arranged in a repeating pattern. At least the positive electrode current collector or the negative electrode current collector includes a current collector tab that extends from an end face thereof. The tab constitutes a plurality of current collector tab groups. The lead terminal at least partially extends from the outer packaging body to an outside. The plurality of overcurrent breaking portions are disposed inside the outer packaging body and electrically connected to the lead terminal. The plurality of current collector tab groups are respectively electrically connected to the plurality of overcurrent breaking portions.

A bipolar battery including a first electrochemical cell and a second electrochemical cell is provided.

This application relates to an electrode plate, an electrochemical device and a safety coating. The electrode plate comprises a current collector, an electrode active material layer and a safety coating disposed between the current collector and the electrode active material layer. The safety coating layer comprises fluorinated polyolefin and/or chlorinated polyolefin polymer matrix, a conductive material and an inorganic filler. The electrode plate can quickly cut off the circuit when the electrochemical device (for example, a capacitor, a primary battery, or a secondary battery) is in a high temperature condition or an internal short circuit occurs, and thus it may improve the high temperature safety performance of the electrochemical device.

An electrode assembly according to an exemplary embodiment of the present invention includes a cathode plate and an anode plate; a separator disposed between the cathode plate and the anode plate; and coating layers disposed between the separator and the cathode plate and between the separator and the anode plate. The separator includes a first portion that is covered with the coating layer, and a second portion that exposes a surface facing the cathode plate and a surface facing the anode plate, and at least one of the cathode plate and the anode plate includes a positive temperature coefficient (PTC) material.

A top cap for a secondary battery includes a circumferential area which defines an outer circumferential surface of the top cap, a central area which defines a central portion of the top cap, a connection area which connects the circumferential area to the central area, and a protrusion area which protrudes downward from the circumferential area, the central area, or the connection area. The top cap is assembled with a battery case, an electrode assembly positioned therein, and a through-hole formation member to form a secondary battery, in which at least a portion of the protrusion area of the top cap is positioned within a through-hole of the through-hole formation member.

A secondary battery includes: a plurality of temperature sensing units that is in close contact with an exterior and senses a temperature of respective areas of the exterior; and an insulating film defining an outer surface of the exterior and having electrical insulation, wherein one or more of the plurality of temperature sensing units include: a positive temperature coefficient element; and a negative temperature coefficient element, and the plurality of temperature sensing units are covered by the insulating film. A method for manufacturing the secondary battery, and a battery module are also provided.