CATL Patente

An ultrasonic welding head (10). The ultrasonic welding head comprises a welding head main body (1) and first welding teeth (2); the welding head main body is provided with a welding surface (1a), the first welding teeth protruding from the welding surface; the first welding teeth comprises a plurality of tooth parts (20), the plurality of tooth parts respectively being a first tooth part (21) to an m-th tooth part which are successively arranged in the protruding direction of the first welding teeth; the n-th tooth part is arranged on the end surface of the end of the (n-1)th tooth part away from the welding surface, the end surface of the end of the (n-1)th tooth part away from the welding surface exceeding the n-th tooth part, and 2 ≤ n ≤ m. The present application further relates to an ultrasonic welding device, an electrode assembly (30), a battery cell (100), a battery (200), and an electrical device (1000).

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Provided are a charging method and apparatus, a computer device, and a storage medium. The method includes: when a battery (102) reaches an end-of-charge phase, acquiring a charging mode of the battery during the end-of-charge phase, where in the charging mode, a charging current of the battery changes dynamically; then determining an electrical parameter value required for charging the battery during the end-of-charge phase on the basis of the charging mode and status information of the battery; and finally, sending the electrical parameter value to a charging pile of the battery until a charging cut-off condition of the battery is reached. The method can shorten the charging duration of the battery during the end-of-charge phase.

A battery cell (20), a battery (100) and an electrical device. The battery cell (20) comprises a casing (21), a first electrode terminal (22), an electrode assembly (23), a first insulating member (24) and a second insulating member (25). The casing comprises a first wall (211), and the first electrode terminal (22) is insulated from and arranged on the first wall (211); the electrode assembly (23) is arranged in the casing (21), the electrode assembly (23) comprising a main body part (231) and a first tab (232); the main body part (231) is flat, and the main body part (231) is provided with a first end surface (2311) facing the first wall (211); the first tab (232) is arranged on the first end surface (2311), and the first tab (232) is electrically connected to the first electrode terminal (22); the first insulating member (24) and the second insulating member (25) are arranged in the casing (21), and in the thickness direction of the main body part (231), the first tab (232) is located between the first insulating member (24) and the second insulating member (25).

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Disclosed is a nail penetration test device (100), which can improve the performance of nail penetration tests. The device (100) includes: a voltage acquisition module (130), including a first connection port and a second connection port, where the first connection port is connected to a nail, and the second connection port is connected to a first electrode terminal of a battery cell (20); and a nail mechanism (120), configured to control the nail to move toward the battery cell (20), where the voltage acquisition module (130) is configured to detect a voltage between the nail and the first electrode terminal during the movement of the nail toward the battery cell (20), and the voltage is used to determine an initial penetration position of the nail on the battery cell (20).

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Disclosed in the present application are a battery cell, a battery and an electrical apparatus. The battery cell comprises an electrode assembly and a casing; the electrode assembly comprises a main body part and a first tab, the first tab extending out of one end of the main body part in a first direction; the casing is provided with an accommodation cavity, the electrode assembly being arranged in the accommodation cavity; the casing is provided with a first through hole and a second through hole, the portion of the accommodation cavity located on the side of the first tab is communicated with the first through hole, and the portion of the accommodation cavity located on the side of the main body part facing away from the first tab is communicated with the second through hole, the first through hole being used for injection of an electrolyte; in the axial direction of the first through hole, both the first tab and the main body part do not overlap the first through hole. The present application can improve the cycle performance of battery cells.

An electrolyte solution additive, an electrolyte solution, a battery, and an electrical apparatus. The electrolyte solution additive includes vinylene carbonate, methylene methanedisulfonate, and an alkynyl compound. The alkynyl compound comprises <img class="EMIRef" id="e7b5f816-2e5e-48aa-a57e-12f574ee410f-ia01" /> wherein n is 0-10, and R comprises <img class="EMIRef" id="e7b5f816-2e5e-48aa-a57e-12f574ee410f-ia02" /> <img class="EMIRef" id="e7b5f816-2e5e-48aa-a57e-12f574ee410f-ia03" /> <img class="EMIRef" id="e7b5f816-2e5e-48aa-a57e-12f574ee410f-ia04" /> or <img class="EMIRef" id="e7b5f816-2e5e-48aa-a57e-12f574ee410f-ia05" />

The present application belongs to the technical field of battery production. Provided are an electronic control device, a battery device, a related device, an energy storage system, and a charging network. The electronic control device comprises a battery management circuit board and an electrical connection assembly, wherein the battery management circuit board is provided with a first connecting terminal, which first connecting terminal is electrically connected to an internal circuit of the battery management circuit board; and the electrical connection assembly comprises a bearing member and a conductive component, the conductive component being connected to the bearing member, and the conductive component comprising a conductive part, a second connecting terminal, and a third connecting terminal. The second connecting terminal is connected to the third connecting terminal by means of the conductive part, the second connecting terminal is connected to the first connecting terminal, and the third connecting terminal is connected to a busbar or a relay inside the electric control device. The present application is aimed at replacing the connection mode of a wire harness, so as to simplify the structure and improve the integration level.

The present application discloses a battery management system and an electric device. The battery management system comprises a first circuit and a protection circuit, wherein the first circuit is connected to the protection circuit, and the protection circuit is used for reducing the amplitude of an interference signal entering the first circuit. The embodiments of the present application can improve the reliability of the battery management system.

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Provided are a positive electrode active material and a preparation method therefor, a secondary battery, and an electric device. The positive electrode active material includes a particle containing lithium nickel cobalt manganese oxide. In a range of a distance L extending from the surface of the particle to the interior of the particle along the radial direction of the particle, the mass concentration of Co gradually increases from the interior of the particle to the surface of the particle along the radial direction of the particle, where L= 1 µm.

The present application provides a battery cell, a battery, and an electrical device. The battery cell includes a casing and an electrode assembly. The casing includes a first casing wall and a second casing wall which are oppositely arranged in a first direction, and an area of a second outer surface of the second casing wall is smaller than or equal to an area of a first outer surface of the first casing wall. The electrode assembly is accommodated in the casing and includes a body part and a first tab, the body part is located between the first casing wall and the second casing wall in the first direction, the first tab extends out from at least one end of the body part in a second direction, and the second direction intersects with the first direction. A distance between the first casing wall and the second casing wall in the first direction is D₁ mm, the area of the second outer surface of the second casing wall is S mm², and S is 36 to 500 times the square of D₁.

The present application belongs to the technical field of batteries, and specifically relates to a high-voltage power distribution device, a battery device and an electric apparatus. The high-voltage power distribution device includes a housing and electrical connection members, wherein the housing includes a first housing body, and the first housing body includes an insulated housing main body; the plurality of electrical connection members are arranged spaced apart from one another and are embedded in the housing main body; each electrical connection member includes a connection portion and an output portion, the connection portion being electrically connected to an electrical member; and the housing main body is further provided with an interface into which an external electrical connector can be adaptively plugged, and the output portion extends to be located within the interface. Each output portion is exposed to an inner wall surface of the interface, wherein when the external electrical connector is plugged into the interface, a connection terminal in the electrical connector comes into electrical contact with the corresponding output portion, and each output portion is accommodated in the interface and is electrically connected to an external electrical connection structure by means of the interface, such that there is no need to lead out the output portions by means of an adapter or a wire, thus facilitating the simplification of the overall structure of the high-voltage power distribution device, and increasing the assembly efficiency.

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Provided are a silicon-carbon composite material and a preparation method therefor, a secondary battery, and an electric device. The silicon-carbon composite material includes a core and a coating coated on the surface of the core, the core includes a carbon matrix and a silicon-based material located on the surface of the carbon matrix; the silicon-based material includes a silicon cluster and a silicon carbide cluster, the silicon carbide cluster forms a network structure, and the silicon cluster is located in a gap of the network structure. The silicon-carbon composite material can eliminate the memory effect of silicon and improve the capacity retention rate.

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