CATL Patente

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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.

The present application is applicable to the technical field of power batteries, and provides an electrode assembly (400) and an adhesive tape application method therefor, a battery cell (300), a battery (200), and an electric device (100). The electrode assembly comprises: a first covering member (60) provided on the surface of the electrode assembly, the first covering member being provided with an information pattern; and a second covering member (70) provided on the surface of the electrode assembly, the information pattern being exposed outside the second covering member. According to the present application, the second covering member covers the surface of the electrode assembly, so that the electrode assembly is protected by the second covering member, thus reducing the impact of the external environment on the electrode assembly; and when the second covering member covers the electrode assembly, the information pattern can be exposed outside the second covering member, thus reducing the impact of the second covering member on the first covering member, so that an identification device can identify information recorded on the first covering member.

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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).

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.

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 provides a perovskite thin film, a perovskite solar cell, a preparation method, a power consuming apparatus, and a power generation apparatus. A thickness direction of the perovskite thin film is recorded as a vertical direction. The perovskite thin film has two surfaces facing away from each other in the vertical direction. At least one surface is a non-smooth surface. The non-smooth surface is provided with a plurality of concave grooves. At least a portion of a side surface of each of the concave grooves forms an inclination angle relative to the vertical direction.

Provided are a nail penetration test method and device, which can improve the nail penetration test performance. The method includes: controlling a penetrating nail to move towards the direction where the penetrating nail is penetrated into a battery cell; and when the voltage between the penetrating nail and a first electrode terminal of the battery cell exceeds a preset voltage, continuing controlling the penetrating nail to penetrate into a predetermined depth.

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.

An energy storage system and a power source apparatus, which belong to the technical field of power sources. The energy storage system comprises: a general positive line, a general negative line and a battery module connected between the general positive line and the general negative line, and the battery module comprises M battery assemblies (11) connected in series. The energy storage system further comprises: N supporting members (12), wherein the M battery assemblies (11) are supported by means of the N supporting members (12), and the M battery assemblies (11) are insulated from the N supporting members (12). The energy storage system further comprises: a conductive path, wherein K supporting members (12) among the N supporting members (12) are connected to the conductive path by means of K branches, respectively, M, N and K are all positive integers, and M≥N≥K>1. A protective assembly (13) is arranged on the conductive path and/or the branch in series. Thus, a short-circuit current is expected to be reduced when double-point insulation of a cross-electrical-box (a supporting member) fails, and the possibility of initiating high-voltage ignition and battery combustion and explosion is reduced.

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.

Provided are a positive electrode plate, a battery, and an electric apparatus. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer disposed on at least one side of the positive electrode current collector, where the positive electrode film layer includes a positive electrode active material and a lyophilic polymer, and a coating weight of the positive electrode film layer is ≥300 mg/1540.25 mm².

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The present application relates to the technical field of batteries, and provides a battery cell, a manufacturing method therefor, a battery and an electrical apparatus. The battery cell comprises a battery core assembly and an outer package; the battery core assembly comprises a positive electrode sheet, an active material coating being provided on the positive electrode sheet, and the active material coating comprising a sodium-containing copper-based layered oxide; the outer package is used for packaging the battery core assembly. A ventilation member is provided in the outer package, the ventilation rate of the ventilation member being equal to or larger than the maximum required venting capacity of the battery cell in total cycle time per unit, and the maximum required venting capacity of the battery cell in the total cycle time per unit being obtained by converting the volume of carbon dioxide generated by cleavage of Cu-O bonds and oxygen release in the sodium-containing copper-based layered oxide. The battery cell of the present application uses the ventilation member to timely discharge the redundant gas generated by the cleavage of Cu-O bonds in the working process of the battery out of the battery cell, such that the problem of battery cell failure caused by valve opening of a pressure relief mechanism of the battery cell due to the internal gas pressure being too large and reaching a threshold value of the pressure relief mechanism is less likely to occur.

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.

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