Abstract: The disclosure relates to a cap assembly and a secondary battery. The cap assembly includes: a cap plate including a main portion and a convex portion, wherein the main portion includes a first surface, a second surface and an electrode lead-out hole; an electrode terminal including an extension portion that extends beyond a hole wall of the electrode lead-out hole and extends in a circumferential direction of the electrode lead-out hole to form a ring structure, and the extension portion is arranged on a side of the first surface away from the second surface; and a sealing ring at least partially disposed between the extension portion and the main portion, wherein the convex portion is disposed on the second surface and around the electrode lead-out hole and has a thickness of 0.01 mm to 2 mm, a top surface of the convex portion extends out of the second surface.
Abstract: This application relates to a positive electrode plate and an electrochemical device. The positive electrode plate comprises a metal current collector, a positive electrode active material layer and a safety coating disposed between the metal current collector and the positive electrode active material layer; the safety coating comprises a polymer matrix, a conductive material and an inorganic filler; the positive electrode active material layer comprises Li1+xNiaCobMe(1?a?b)O2, wherein ?0.1?x?0.2, 0.6?a<1, 0<b<1, 0<(1?a?b)<1, and Me is at least one of Mn, Al, Mg, Zn, Ga, Ba, Fe, Cr, Sn, V, Sc, Ti and Zr; and the metal current collector is a porous aluminum-containing current collector. The positive electrode plate can improve safety and electrical performances of an electrochemical device (such as a capacitor, a primary battery, or a secondary battery).
Abstract: The present disclosure provides a positive electrode plate and an electrochemical battery. The positive electrode plate comprises a positive electrode current collector and a positive electrode film. The positive electrode film is provided on the positive electrode current collector and comprises a positive electrode active material and a binder. The positive electrode active material comprises a prussian blue analogue material, the binder is an oil-soluble binder, an area density of the positive electrode film is 5 mg/cm2˜30 mg/cm2. In the positive electrode film of the present disclosure, the prussian blue analogue material is used together with the oil-soluble binder, and the area density of the positive electrode film is controlled within a certain range, so that introduction of the water molecule can be reduced during the preparation process and coating process of a positive electrode slurry, and cycle performance of the electrochemical battery can be improved.
Abstract: The present disclosure provides an insulation detection circuit and method, and a battery management system. The circuit includes a first isolation module, a voltage division module, a signal generation module, first and second sampling points and a processor. A first end of the first isolation module is connected to a power battery, and a second end of the first isolation module is connected to the second sampling point. The signal generation module is connected to the first sampling point and configured to inject an AC signal into the power battery and provide the first sampling point with a first sampled signal. A first end of the voltage division module is connected to the first sampling point, and a second end of the voltage division module is connected to the second sampling point. The processor is configured to calculate an insulation resistance of the power battery.
Abstract: The present disclosure provides a rechargeable battery, including an electrode assembly and a connecting member. The electrode assembly includes an electrode assembly body and an electrode tab extending from an end surface of the electrode assembly body. The connecting member includes a guiding plate, a first connecting plate and a second connecting plate respectively connected to the guiding plate. The first connecting plate, the second connecting plate and the guiding plate extend along a width direction. The electrode tab is bent with respect to a longitudinal direction to form a bending part and the bending part of the electrode tab is connected to the first connecting plate. The width direction is to a thickness direction of the rechargeable battery.
Abstract: A battery pack system, a control method thereof and a management device are provided. A battery pack is connected in series with a discharge circuit unit and a charge circuit unit; a battery management unit is to monitor a temperature of the battery pack, to periodically send, when the temperature of the battery pack is lower than a threshold, a turn-on-instruction to the discharge circuit unit and the charge circuit unit alternately to control the discharge circuit unit and the charge circuit unit to be alternately turned on in heating cycles; the discharge circuit unit is to be turned on according to the turn-on-instruction to enable electricity of the battery pack to flow into the energy storage unit in discharging-phase; and the charge circuit unit is to be turned on according to the turn-on-instruction to enable electricity of the energy storage unit to flow into the battery pack in charging-phase.
Abstract: The present disclosure relates to a separator assembly and a battery module, wherein the separator assembly comprises: a separator body, having a first surface and a second surface opposite to each other in a thickness direction of the separator body; electrical connecting plates, connected to the second surface of the separator body, wherein two or more electrical connecting plates are spaced apart from each other in a length direction of the separator body, and a through slot is provided on the separator body between two adjacent electrical connecting plates, extending from the first surface to the second surface in the thickness direction; and an output electrode plate mount, being connected to the second surface of the separator body as a cantilever.
Abstract: The present disclosure provides an electrolyte and an electrochemical energy storage device, the electrolyte comprises an electrolyte salt and an additive. The additive comprises a sulfonic ester cyclic quaternary ammonium salt and a multinitrile compound. The sulfonic ester cyclic quaternary ammonium salt and the multinitrile compound can form a dense and uniform passive film with high ionic conductivity on a surface of each of the positive electrode film and the negative electrode film, so as to prevent continuous oxidation and reduction reaction from occurring between the electrolyte and the positive electrode film and the negative electrode film and make the electrochemical energy storage device has excellent high temperature cycle performance and high temperature storage performance.
Abstract: A method, an apparatus and a device for charging a battery are provided. The method may include: defining a charging current In for an Nth charging stage of a charging process based on charging capability of the battery, wherein In<In-1; defining a charge cutoff voltage Vn for the Nth charging stage of the charging process, wherein Vn>Vn-1 and Vn is smaller than a theoretical charge cutoff voltage Vmax; in case that the N-1th charging stage is not a last charging stage, charging the battery with In-1 during the N-1th charging stage and proceeding to the Nth charging stage when a voltage across the battery reaches Vn-1; and in case that the N-1 th charging stage is the last charging stage, charging the battery with In-1 during the N-1th charging stage and stopping charging when the voltage across the battery reaches Vn-1.
Abstract: A relay diagnosis circuit, diagnosis method, and battery management system are disclosed in the present disclosure. The relay diagnosis circuit may include a first sampling unit, a second sampling unit, a first sampling point, a second sampling point, a reference voltage terminal, and a processor. A first end of the first sampling unit is connected with voltage output end of the power battery pack to be measured and a first end of a relay. A second end of the first sampling unit is connected with the reference voltage terminal and the first sampling point. A first end of the second sampling unit is connected with a second end of the relay. A second end of the second sampling unit is connected with the reference voltage terminal and the second sampling point.
Abstract: The disclosure relates to a top compression plate, a secondary battery and a method for manufacturing a secondary battery. The secondary battery includes an electrode assembly, a cap plate, an electrode terminal disposed on the cap plate and an insulating member, the electrode assembly includes a main body and a tab connected to the main body, and the insulating member includes a connecting protrusion extending toward the main body. The top compression plate includes: a first surface and a second surface oppositely disposed along a thickness direction of the top compression plate, and a mounting hole extending from the second surface toward the first surface, the top compression plate is disposed between the insulating member and the main body, the first surface faces the main body, the connecting protrusion may mate with the mounting hole, and a top end surface of the connecting protrusion does not exceed the first surface.
Abstract: The present application discloses a secondary battery including a cap plate, an electrode terminal, an electrode assembly, and a connection member which includes a first connecting plate connected to a tab, a second connecting plate, and a support plate, at least a part of the support plate protrudes, relative to the first connecting plate, towards a side close to a body, and the protruding part of the support plate is attached to the body; a minimum distance between the support plate and a bottom surface of the electrode assembly in a height direction of the secondary battery is a bare height H of the body on its side, a size of the body in a length direction of the secondary battery is a body length L, and the bare height H and the body length L satisfy the following relationship: 0.1?H/L?0.8. A vehicle is further disclosed.
Abstract: The present application relates to a lithium ion secondary battery comprising a cathode, an anode, a separator and an electrolyte; wherein the cathode comprises a positive current collector and a positive material layer, wherein the positive material layer comprises a positive active material with a formula LixNiaCobMcO2, M is at least one selected from Mn and Al, 0.95x1.2, 0<a<1, 0<b<1, 0<c<1 and a+b+c=1; wherein the anode comprises a negative current collector and a negative material layer, wherein the negative material layer comprises graphite having a graphitization degree of 92% to 98% and an average particle size D50 of 6 ?m to 18 ?m as negative active material. The lithium ion secondary battery has long cycle life and high energy density.
Abstract: This disclosure relates to the technical field of energy storage devices, and in particular, to a mounting bracket for a cell supervision circuit, a battery pack, and a vehicle. The mounting bracket includes: a management system mounting part, including a management system mounting surface, which is configured to mount a cell supervision circuit; and a thermally conductive part, configured to fit snugly to a container of the battery pack, which is connected to one end of the management system mounting part, and disposed on a side where the management system mounting surface is located.
Abstract: The present application provides a charge and discharge circuit, and relates to the field of battery power. The charge and discharge circuit comprises: a charge circuit comprising a battery pack, a first switch set and a charging device connected in series; and a discharge circuit comprising the battery pack, a second switch set and an electrical device connected in series; both the first switch set and the second switch set comprise at least one switch, and the at least one switch in the first and/or second switch set is a semiconductor switch.
Abstract: The present disclosure provides a method, a device, a system, and a storage medium for SOC correction for a battery. The method includes determining a current OCV measurement value of the battery, and determining whether the current OCV measurement value is within a hysteresis voltage interval; determining, when the current OCV measurement value is within the hysteresis voltage interval, a charging SOC value corresponding to the current OCV measurement value in the charging state and a discharging SOC value corresponding to the current OCV measurement value in the discharging state; and determining, based on a SOC confidence interval determined from the charging SOC value and the discharging SOC value, a SOC correction target value to correct a current SOC value of the battery. The embodiments of the present disclosure may implement SOC correction for the battery having a hysteresis characteristic to improve estimation accuracy of the battery SOC.
Abstract: The present disclosure provides a high-voltage interlock system and a detection method thereof. The high-voltage interlock system includes a target control device and at least one non-target control device connected in sequence. The target control device includes a detection unit, a current generation controller, a current generator, and a second high-voltage component. A controller in the target control device generates a pulse drive signal for driving the current generation controller, receives a detection result signal output from a current detector, and determines a fault of a high-voltage interlock circuit according to the detection result signal; the current generation controller generates an alternating voltage signal according to the pulse drive signal; the current generator outputs an alternating current signal according to the alternating voltage signal; the current detector acquires a voltage signal across a detection resistor set and outputs the detection result signal.
Abstract: A method and apparatus for correcting a state of charge (SOC) is provided. The method includes: acquiring state data of a battery cell in a case where the battery cell meets a preset standing condition; determining, when a length of voltage data in the state data is greater than a first preset length and less than a second preset length, and a change value of the voltage data in the state data is greater than a preset change threshold, a first set of pending parameters of a predetermined near-steady-state battery model according to the state data; predicting, according to the first set of pending parameters, a second set of pending parameters of the predetermined near-steady-state battery model; calculating an estimated steady-state OCV value according to the second set of pending parameters; and determining a SOC correction value corresponding to the estimated steady-state OCV value to correct current SOC.
Abstract: A measurement device for measuring a current calibration coefficient includes: a host computer and a current source, wherein the host computer is configured to acquire current calibration coefficients including a current calibration coefficient at a temperature T1 and a current calibration coefficient at a temperature T2, and transmit the current calibration coefficients to the current detection device.
Abstract: The present disclosure relates to a vent for a secondary battery top cover, a top cover assembly, a secondary battery and a vehicle. The vent includes a flat base and a protrusion protruding outward with respect to flat base. The protrusion has a main nick and at least one branch nick connected to at least one end of the main nick. An angle formed between the main nick and the branch nick is more than zero. When the pressure inside the case increases excessively, gas causes stress concentration at the protrusion such that the vent is torn along the main nick and the at least one branch nick, thereby releasing the gas in the case, reducing explosion risk of the secondary battery, and improving safety of the secondary battery.