Abstract: The present application discloses a method and a system for relay diagnosis. The method includes: transmitting a control signal to the relay, wherein types of the control signal include an enable signal and a disable signal; applying a detection signal at one side of the relay, and receiving a feedback signal at the other side of the relay; and comparing the detection signal with the feedback signal to obtain a comparison result, wherein if the comparison result matches the control signal, the relay is determined as being normal, otherwise, the relay is determined as fault. The present application simply needs to concern whether the relay being diagnosed is enabled or not, and compares the received feedback signal with the applied detection signal to realize the relay diagnosis, thereby avoiding the impacts from other devices in the relay circuit. Thus, the diagnostic efficiency and accuracy can be improved.

Abstract: This application provides a secondary battery including an electrode assembly, a first terminal, a second terminal, a top cover plate and a contacting plate attached to the first terminal, the electrode assembly includes a first electrode, a second electrode and a separator between the first electrode and the second electrode, the first terminal is electrically connected with the first electrode, the second terminal is electrically connected with the second electrode, the top cover plate is insulated from the first terminal and is electrically connected with the second terminal, when internal pressure of the secondary battery exceeds reference pressure, the contacting plate deforms under the internal pressure and contacts the top cover plate, so as to form an electrical connecting path through the first electrode, the first terminal, the contacting plate, the top cover plate, the second terminal and the second electrode.

Abstract: The disclosure discloses a sampling detection circuit and a method for detecting a circuit malfunction.

Abstract: A positive active material comprising active material bulk particles and a coating layer of an oxide containing N element is disclosed, wherein the surface of the active material bulk particle is doped with M element to form a doped layer, and the content of the M element is 400 ppm to 3000 ppm, and the content of the M element gradually decreases from the outer surface of active material bulk particles towards the core direction; wherein the content of the N element in the coating layer is 100 ppm to 2000 ppm; wherein the average content of the N element per unit volume of the coating layer is greater than the average content of the M element per unit volume of the doped layer; wherein the M element and the N element are each independently selected from one or more of Mg, Ca, Ce, Ti, Zr, Al, Zn, and B.

Abstract: Embodiments of the present invention provide a sampling component and a battery module. The sampling component is applied to a battery module and comprises: a busbar having a first surface and a second surface which are opposite to each other, the busbar comprising mounting slots formed by extending in a direction from the first surface to the second surface; a circuit board disposed on a side of the busbar; and, a connecting sheet, comprising a first flat portion and a bent portion which are connected to each other, one end of the first flat portion being connected to the busbar while the other end thereof being connected to the circuit board, the bent portion being located in the mounting slots.

Abstract: Some embodiments of the present disclosure relate to technical field of the battery cooling technical and provide a battery cooling assembly, including: a cooling tube; a collecting tube, provided with at least one collecting opening; a connecting aid, including a base plate provided with a through hole, and a hole wall of the through hole extends outwardly to form an extension. An end of the cooling tube is connected to the extension through the through hole, the base plate is connected with the collecting tube, and the through hole being in communication with the collecting opening. The battery cooling assembly of the present disclosure can increase the connection strength between the cooling tube and the collecting tube, thereby reducing a risk of leakage of a cooling medium.

Abstract: The present disclosure provides an insulation detection device and method for an energy storage system. The insulation detection device includes a positive switching device, a negative switching device, a sampling unit, a reference voltage terminal and a processor. The sampling unit is configured to collect a positive sampled signal on the energy storage device when the positive switching device and the negative switching device are in a first switching state, and collect a negative sampled signal on the energy storage device when the positive switching device and the negative switching device are in a second switching state; and the processor is configured to determine a positive insulation resistance value and a negative insulation resistance value of the energy storage device according to the positive sampled signal and the negative sampled signal.

Abstract: The present application relates to a positive electrode and a Li-ion battery including the positive electrode, the positive electrode comprises a positive electrode current collector and a first active material layer including a first positive electrode active material arranged on the positive electrode current collector, a buffer layer including a carbon material and a binder, and a second active material layer including a second positive electrode active material, the buffer layer is arranged between the first active material layer and the second active material layer. The positive electrode provided by the present application, when applied to the lithium battery, not only can improve the safety performance of the Li-ion battery, but also improve the cycle performance of the Li-ion battery.

Abstract: The present invention discloses a Lithium ion battery and an electrolyte thereof, the electrolyte comprising an organic solvent, a lithium salt and an additive. The additive comprises additive (A) cyclic fluoro carbonate, additive (B) cyclic phosphazene (B), and additive (C) cyclic sulfate. The additive B cyclic phosphazene has the following general structural formula: Compared with the prior art, the electrolyte of the present invention may form a stable CEI and SEI film on the surface of positive and negative electrodes, protect the interface between positive and negative electrodes, improve the acidic atmosphere of Lithium ion battery electrolyte, and reduce the damage effect of HF on the interface between positive and negative electrodes, thereby improving cycle life, high temperature storage performance, and safety performance of lithium-ion battery.

Abstract: A secondary battery has an electrode plate, including a current collector, an active material layer and a conductive structure. The current collector includes an insulating layer, first and second conductive layers, and the first conductive layer and the second conductive layer are respectively arranged onto two surfaces of the insulating layer. The first conductive layer has a first body section with a first protruding section connected thereto. The second conductive layer has a second body section with a second protruding section connected thereto. The conductive structure includes a first conductive member connected to the first protruding section and a second conductive member connected to the second protruding section. The second conductive member is bent towards the first conductive member and connected to the first conductive member, and the first conductive member extends away from the active material layer and is beyond the second conductive member.

Abstract: The present application provides a lithium iron phosphate battery. The lithium iron phosphate battery comprises: positive electrode plate comprising a positive current collector and a positive electrode film provided on the surface of the positive current collector; a negative electrode plate comprising a negative current collector and a negative electrode film provided on the surface of the negative current collector; a separator provided between the positive electrode plate and the negative electrode plate; and an electrolyte comprising an organic solvent, a lithium salt and an electrolyte additive. The electrolyte additive comprises a cyclic carbonate containing a double bond and a cyclic disulfonate represented by formula I. In formula I, A and B are each independently selected from an alkylene group having 1 to 3 carbon atoms.

Abstract: A smoke alarm system comprises a smoke alarm, a temperature detector, a first sampling circuit, a second sampling circuit and an analysis module; a first terminal of the first sampling circuit is connected to the smoke alarm, and a second terminal is connected to a first input terminal of the analysis module; the first sampling circuit is used for sampling from the smoke alarm to obtain a smoke sample value which is then output to the analysis module; a first terminal of the second sampling circuit is connected to the temperature detector, and a second terminal is connected to a second input terminal of the analysis module; the second sampling circuit is used for sampling from the temperature detector to obtain a temperature sample value which is then output to the analysis module; and the analysis module determines whether a smoke alarm signal is generated.

Abstract: The present application relates to an end plate assembly of a battery module and a battery module. The end plate assembly includes an end plate and an energy absorbing component, the energy absorbing component is arranged between the end plate and a battery, the energy absorbing component includes a stress bearing plate and a bending plate, the bending plate and the stress bearing plate are connected with each other. After the battery module is assembled, if the battery of the battery module expands and applies an expansion force to the energy absorbing component, then the bending plate of the energy absorbing component will deform elastically, so as to absorb the expansion force of the battery. Therefore, the end plate of the end plate assembly will stress smaller expansion force, so as to prevent the battery module from failure, thereby improving structural strength of the battery module.

Abstract: The present invention discloses a Lithium ion battery and an electrolyte thereof, the electrolyte comprising an organic solvent, a lithium salt and an additive. The additive comprises a cyclic fluoro carbonate (A), a cyclic phosphazene (B), a cyclic sulfate and a lithium fluoro oxalate borate (D). The lithium fluoro oxalate borate (D) has following formula: Compared with the prior art, the electrolyte of the present invention may form a stable CEI and SEI film on the surface of positive and negative electrodes, protect the interface between positive and negative electrodes, improve the acidic atmosphere of Lithium ion battery electrolyte, and reduce the damage effect of HF on the interface between positive and negative electrodes, while reducing low temperature resistance of lithium-ion battery, improving cycle life, high temperature storage performance, safety performance and rate capability of lithium-ion battery.

Abstract: The present application provides a secondary battery including a first terminal component, a second terminal component, a cap plate, an electrode component and a resistance element. One of the first and second terminal components is electrically connected to the cap plate through the resistance element, while the other is insulated from the cap plate. The first terminal component includes a connecting plate and a turnable plate, and the connecting plate is attached to the turnable plate. When the secondary battery is in a normal state, a first electrode plate is electrically connected to the connecting plate through the turnable plate, and the second electrode plate is electrically connected to the second terminal component. When a pressure inside the secondary battery exceeds a reference pressure, the turnable plate can turn over to cut off an electrical connection between the turnable plate and the first electrode plate.

Abstract: The invention refers to negative electrode plate, preparation method thereof and electrochemical device. The negative electrode plate comprises: a negative current collector; a negative active material layer disposed on at least one surface of the negative current collector, the negative active material layer comprising opposite first surface and second surface, wherein the first surface is disposed away from the negative current collector; and an inorganic dielectric layer consisting of an inorganic dielectric material disposed on the first surface of the negative active material layer. The negative electrode plate provided by the application is useful in an electrochemical device, and can result in an electrochemical device having simultaneously excellent safety performance and cycle performance.

Abstract: The present application discloses a positive electrode plate and a lithium-ion secondary battery, wherein the positive electrode plate comprises a positive electrode current collector and a positive active material layer disposed on at least one surface of the positive electrode current collector, and wherein the positive active material layer comprises a first positive active material and a second positive active material, and wherein the positive electrode plate has a resistivity of 3,500 ?·m or less. The positive electrode plate provided by the present application enables the lithium-ion secondary battery to have high specific capacity and energy density and excellent safety performance, while at the same time to have excellent cycle performance and rate performance.

Abstract: The invention refers to negative electrode plate, preparation method thereof and electrochemical device. The negative electrode plate comprises: a negative current collector, a negative active material layer, and an inorganic dielectric layer which are provided in a stacked manner; the negative active material layer comprises opposite first surface and second surface, wherein the first surface is disposed away from the negative current collector; the inorganic dielectric layer is disposed on the first surface of the negative active material layer. The negative electrode plate provided by the application is useful in an electrochemical device, and can result in an electrochemical device having simultaneously excellent safety performance and cycle performance.

Abstract: A battery pack management system includes a controller, an isolation unit, a plurality of battery pack management units, and a plurality of battery packs. The plurality of battery pack management units are connected in series by a first daisy chain, and the plurality of battery pack management units are also connected in series by a second daisy chain. The first daisy chain transmits sampled data that is collected by the battery pack management units from corresponding battery packs and transmits control instructions of the controller. The second daisy chain transmits a failure prompt signal which is generated by a battery pack management unit that detects a failure. A first battery pack management unit and a last battery pack management unit of the plurality of battery pack management units connected in series are connected to the controller through the isolation unit.

Abstract: The invention refers to negative electrode plate, preparation method thereof and electrochemical device. The negative electrode plate comprises: a negative current collector, a negative active material layer, and an inorganic dielectric layer which are provided in a stacked manner; the negative active material layer comprises opposite first surface and second surface, wherein the first surface is disposed away from the negative current collector; the inorganic dielectric layer is disposed on the first surface of the negative active material layer and consists of an inorganic dielectric material. The negative electrode plate provided by the application is useful in an electrochemical device, and can result in an electrochemical device having simultaneously excellent safety performance and cycle performance.