Abstract: Disclosed is a battery pack temperature detection system, comprising: a battery pack disposed with a plurality of temperature monitoring points; a plurality of sampling circuits, wherein each temperature monitoring point is disposed with at least two of the plurality of sampling circuits, and the at least two of the plurality of sampling circuits disposed for one temperature monitoring point are different sampling circuits; and a control module configured to acquire temperature data of each temperature monitoring point by each of the disposed sampling circuits, and determine a current temperature of the battery pack according to the temperature data to determine whether the temperature of the battery pack exceeds a preset value.

Abstract: Disclosed are a load state detection circuit and method. A microcontroller is connected to a switch unit which is connected between a detecting power supply and a load to be tested. A voltage sampling point is formed at either terminal of the load to be tested, and the voltage sampling circuit is connected between the voltage sampling point and the microcontroller. The voltage sampling circuit is configured to sample a voltage at the voltage sampling point. The microcontroller is configured to connect the load to be tested and the detecting power supply by controlling the switch unit, and determine whether a fault exists in the load to be tested according to a received voltage at the voltage sampling point sampled by the voltage sampling circuit, before connecting the load to be tested with the drive power supply.

Abstract: The present disclosure relates to a sampling assembly and a battery pack. The assembly comprises: a circuit board comprising a sampling unit; a first detector comprising a first and second connecting ends arranged at interval, wherein the first detector is connected to the circuit board via the first and second connecting ends to transmit information on first voltage between the first and second connecting ends to the circuit board, and the first detector is connectable in series to and between the two terminals to be detected; and a second detector located in a magnetic field generated by current flowing through the first detector and can generate information on second voltage according to the magnetic field, wherein the second detector comprises an output terminal and is connectable to the circuit board via the output terminal to transmit the information on second voltage to the sampling unit.

Abstract: The present application provides a power-down detection circuit and a control method. A low-voltage side power supply is connected to provide an output voltage of the low-voltage side power supply to a power-down detection sub-circuit and provide a standard supply voltage to the power-down detection sub-circuit, a controller and a memory via a voltage conversion circuit. The power-down detection sub-circuit is configured to obtain the output voltage of the low-voltage side power supply, and determine, according to the output voltage of the low-voltage side power supply, whether a power-down event occurs in the low-voltage side power supply. If it is determined that a power-down event occurs, a power-down signal is sent to the controller. The controller receives the power-down signal, and controls the memory to record current information of a high voltage bus sensed by a high-voltage side current sensor.

Abstract: The present application discloses a current collector, an electrode plate, and an electrochemical device. The current collector comprises: a support layer comprising opposite two surfaces along the thickness direction thereof; a conductive layer disposed on at least one of the two surfaces of the support layer; wherein the support layer comprises a support material selected from one or more of a polymer material and a polymer matrix composite material, and wherein the light transmittance T of the support layer is 0?T?98%. The current collector, electrode plate and electrochemical device provided by the present application have good processability.

Abstract: The present disclosure provides a battery management system and a communication method. The method includes: determining, by a main BMU, from a plurality of managed units a fault unit that communicates abnormally with the main BMU, and transmitting, by the main BMU, to a backup BMU a fault frequency at which the fault unit communicates abnormally with the main BMU; selecting, by the backup BMU, from the managed units a managed unit that communicates normally with the backup BMU and the fault unit as a target unit; transmitting, by the backup BMU, frequency-conversion information to the fault unit through the target unit based on the fault frequency; converting, by the fault unit, its frequency to a frequency; transmitting the frequency to the main BMU if the backup BMU communicates normally with the fault unit using the frequency; and communicating, by the main BMU, with the fault unit using the frequency.

Abstract: The present disclosure provides a battery management system, and a method and apparatus for transmitting information. The method includes: determining, from a plurality of slave nodes, a fault slave node that communicates abnormally with a master node in the battery management system; selecting a target slave node from the plurality of slave nodes, wherein the target slave node is a slave node that communicates normally with both the master node and the fault slave node; transmitting frequency conversion information to the target slave node, so that the target slave node forwards the frequency conversion information to the fault slave node, and the fault slave node performs a frequency conversion based on the frequency conversion information; and transmitting information with the fault slave node using a frequency after the frequency conversion. According to embodiments of the present disclosure, the reliability of wireless communication in the battery management system can be improved.

Abstract: The embodiments of the present disclosure disclose a method for data transmission, comprising: authenticating, by a target node in a battery management system, a source node in response to a request for data transmission from the source node; selecting, by the target node, any two prime numbers from a pre-stored set of prime numbers if the authentication is passed, generating a public key and a private key according to the two prime numbers, and transmitting the public key to the source node; performing, by the source node, a first encryption byte-by-byte for source data to be transmitted using the public key, performing a second encryption for the first encrypted data using a first encryption algorithm stored by the source node itself, and transmitting the second encrypted data to the target node.

Abstract: A system comprises an antenna, a port converting device, an information transmission device, a shield case, and a reference voltage end; wherein the antenna, the port converting device, and the information transmission device are connected sequentially, and the information transmission device is disposed within the shield case, and both the shield case and the port converting device is connected with the reference voltage end; the antenna is configured for a conversion between a radio frequency signal and a single-ended signal; the port converting device is configured for a conversion between the single-ended signal and target differential mode signals; the information transmission device is configured to transmit and process the target differential mode signals; and parameters of components in the port converting device is determined according to a preset communication frequency and a voltage amplitude and phase of a differential mode signal.

Abstract: The embodiments of the present disclosure disclose a battery management system. The battery management system comprises: a battery management unit, configured to receive status information of a battery module and status information of a battery pack, and transmit a control instruction to cell measurement circuits; the cell measurement circuits, configured to collect the status information of the battery module, transmit the status information of the battery module to the battery management unit, receive and execute the control instruction transmitted from the battery management unit; sensing units, configured to collect the status information of the battery pack, and transmit the status information of the battery pack to the battery management unit; wherein a wireless communication unit is disposed in the battery management unit, and a wireless communication unit is disposed in at least a portion of the cell measurement circuits and/or at least a portion of the sensing units.

Abstract: The present disclosure provides a secondary battery which comprises: a cap plate provided with a first electrode terminal and a second electrode terminal; an electrode assembly comprising a main body, a first electrode tab provided to the main body and a second electrode tab provided to the main body; a first connecting piece connected between the first electrode tab and the first electrode terminal. The second electrode tab is connected with the second electrode terminal. The first electrode tab includes a first connecting portion welded with the first connecting piece and a first bending portion bent downwardly and connected between the main body of the electrode assembly and the first connecting portion. A first insulating adhesive is adhered on weld zones which are formed during welding of the first connecting portion and the first connecting piece and face the main body of the electrode assembly.

Abstract: Disclosed is an insulation detection method that includes: a first and second equivalent resistances are calculated; the less one of the first and second equivalent resistances is taken as a first insulation resistance, which is an insulation resistance of the high voltage circuit on the side where the battery pack locates relative to the reference potential terminal; when the first insulation resistance is normal, the switch unit is closed, and a second insulation resistance is calculated according to the first and second equivalent resistances, voltages of a first and second sampling point when the switch unit is closed; the second insulation resistance is an insulation resistance of the high voltage circuit on the side where the load locates relative to the reference potential terminal; the insulation state of the high voltage circuit on the side where the load locates is determined according to the second insulation resistance.

Abstract: A welding assembly for a liquid-injection hole of a secondary battery, including a top cover of a case, a liquid-injection hole, a sealing cover-plate and a stress release structure, wherein the liquid-injection hole is disposed in the top cover and includes a assembling recess and a through-hole arranged sequentially from top to bottom of the top cover, the assembling recess and the through-hole present a stepped transition and the radial dimension of the assembling recess is larger than that of the through-hole. The sealing cover-plate is accommodated in the assembling recess and the stress release structure is provided at one or both sides of the welding portion and capable of releasing stress from the welding portion. The welding assembly provides a stress release structure nearby the welding portion, and when the welding portion is full-strength welded, the stress-release structure can effectively release stress nearby the welding seam.

Abstract: The present application relates to the technical field of batteries and, particularly, relates to an end plate of a battery module and a battery module. The end plate of a battery module includes a main body and an energy absorbing body, the energy absorbing body includes an acting portion and a connecting portion, the acting portion protrudes in a direction from the main body toward a battery, and the acting portion is connected with the main body through the connecting portion. After the battery module is assembled, if the battery of the battery module expands and applies an expansion force to the end plate, then the energy absorbing body will deform elastically, so as to absorb the expansion force of the battery. Therefore, the end plate can prevent the housing of the battery module from failure, so as to improve structural strength of the battery module.

Abstract: The present disclosure relates to a battery module. The battery module includes at least two battery units arranged in a stack. Each of at least two battery units includes: a support; at least one pouch-type battery; and a thermal-dissipation protection case. The thermal-dissipation protection case is connected to the support to form an accommodating space, and the at least one pouch-type battery is accommodated in the accommodating space. At least one of the at least two battery units includes an exposure area exposing the at least one pouch-type battery, and the thermal-dissipation protection case of a battery unit adjacent to the at least one of the at least two battery units is in contact with the at least one pouch-type battery through the exposure area.

Abstract: The present application relates to a negative electrode plate and a secondary battery. Specifically, the present application provides a negative electrode plate comprising a negative electrode current collector and an negative electrode film coated on at least one surface of the negative electrode current collector and containing the negative active material, wherein the negative electrode plate satisfies 0.60.7×P×(D90-D10)/D5O+B/38.0 wherein P refers to the porosity of the negative electrode film; B refers to the active specific surface area of the negative electrode film, and the unit thereof is m2/g; D10 refers to the particle size corresponding to the cumulative volume percentage of the negative active material reaching 10%, D90 refers to the particle size corresponding to the cumulative volume percentage of the negative active material reaching 90%, and D50 refers to the particle size corresponding to the cumulative volume percentage of the negative active material reaching 50%.

Abstract: The present disclosure provides a battery module, which comprises: a plurality of mono-batteries, each mono-battery has electrode terminals which are opposite in electrical polarity; and an electrical connection sheet connecting at least two corresponding electrode terminals, the electrical connection sheet is formed with at least one fusing portion, each fusing portion is positioned between two adjacent electrode terminals. The battery module further comprises: an insulating sheet supported on the fusing portion which is positioned between the two adjacent electrode terminals connected by the electrical connection sheet, when the fusing portion supporting the insulating sheet is fused and a fracturing slit is formed, the insulating sheet drops into the fracturing slit to electrically isolate two facing sides of the electrical connection sheet which are at the fracturing slit. Therefore it avoids the phenomenon of an electrical arc occurring at the fracturing slit and makes the electrical arc extinct.

Abstract: The present disclosure provides a secondary battery which comprises a cap plate, an electrode assembly and a first connecting piece. The cap plate comprises a first electrode terminal; the electrode assembly comprises a main body, a first electrode tab; the first connecting piece is connected between the first electrode tab and the first electrode terminal. The first electrode tab includes a first connecting portion provided below the first connecting piece and a first bending portion connecting the main body and the first connecting portion. The secondary battery further comprises a first protecting piece fixed to a bottom of the first connecting portion. The first protecting piece includes a main portion and a first curve portion connected with an outer end of the main portion and curved relative to the main portion; the first bending portion is bent downwardly along a curved outer wall of the first curve portion.

Abstract: The present disclosure provides a temperature detecting device and a battery pack. The temperature detecting device includes a housing, a temperature sensor and a fixed part. A sensing portion of the temperature sensor is located on the surface of the housing, and the surface of the housing where the sensing portion is located is a temperature detecting surface; the fixed part is connected to the housing, and a space for accommodating an object to be measured to pass through is provided between the fixed part and the temperature detecting surface. The battery pack includes two or more battery cells, a heat exchange tube, and the temperature detecting device.

Abstract: The disclosure relates to a battery module comprises a housing, a battery stack, a cover plate assembly, and a guiding component. The battery stack is disposed in a containing chamber of the housing. The cover plate assembly comprises a plate, a deformable plate and a module output, the plate is arranged to close the opening, the deformable plate is connected to the plate and is deformable in a thickness direction of the plate, the module output is connected to the plate and is disposed opposite to the deformable plate, the module output and the battery stack are electrically connected. The guiding component is disposed between the cover plate assembly and the battery stack, and comprises a guiding channel and an exhaust port, and the gas released after the first vent plate is opening flows to the deformable plate through the exhaust port and the guiding channel.