CATL Patente

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The present application provides a coating device and coating method for an electrode assembly. The electrode assembly includes an electrode main body, the electrode main body has a first direction, a second direction and a third direction that are orthogonal to each other, and includes two main surfaces, two end surfaces, and two side surfaces, and the coating device includes a discharge assembly, a cutting assembly and a first coating assembly. The discharge assembly is used to store and release a material strip, which includes a plurality of coating films connected in sequence along a length direction of the material strip, and each coating film includes two main coating areas spaced apart from each other and a connecting area connected between the two main coating areas. The cutting assembly is used to cut a head end coating film located at a head end of the material strip from the material strip. The first coating assembly is used to coat the first of the two end surfaces with the connecting area of the head end coating film, and to coat each of the two main surfaces with corresponding one of the two main coating areas, so as to form an electrode coating body. Through the above manner, the action complexity of a coating process can be simplified.

The present application discloses a battery insertion device, a battery assembly method, and a battery assembly system. The insertion device comprises a machine frame, a bearing mechanism, and an insertion mechanism; the bearing mechanism is arranged on the machine frame, and is used for bearing a bottom cover and an electrode assembly supported above the bottom cover; and the insertion mechanism is arranged on the machine frame, and comprises a case fixing mechanism and a tab part guide mechanism, the case fixing mechanism is used for fixing a case, and the tab part guide mechanism and the case fixing mechanism both can get close to or away from the bearing mechanism, wherein the case fixing mechanism is configured to sleeve the case onto the outer side of the electrode assembly by means of an open end when moving close to the bearing mechanism; and the tab part guide mechanism is configured to guide a tab part to penetrate out of an accommodating cavity through a through hole when the case is sleeved on the electrode assembly. According to the present application, by means of the mode, the tab part smoothly extends out of the case, thereby achieving the accurate insertion of the electrode assembly, reducing the battery preparation difficulty, and improving the assembly efficiency and the yield of batteries.

The present application relates to the technical field of batteries. Disclosed in the present application are a battery cell, a battery, and an electric device. The battery cell comprises a shell and a pressure relief notch, wherein the shell comprises a first wall; and the pressure relief notch is arranged in the first wall and comprises an arc section and a first extension section, the arc section having a first end, and the first extension section being connected to the first end and extending from the first end in the direction approaching the central axis of the arc section. In the battery cell according to the embodiments of the present application, the tearing range and tearing direction of a torn part on the shell can be controlled, and partial valve opening can be achieved after thermal runaway of the battery cell and tearing of the pressure relief notch, thereby reducing the probability of tearing over a large area of the shell and reducing the damage to the battery cell caused by uncontrollable cracks.

Provided in the embodiments of the present application are a battery cell, a battery, an electric apparatus, and an energy storage device. The battery cell comprises a casing and an electrode assembly, wherein the casing comprises a casing body and an end cap, the casing body being provided with an opening and comprising a first wall, the first wall comprising a first opening portion and a first body portion, which are distributed in sequence in a first direction, the first direction being parallel to the thickness direction of the end cap, the first body portion being far away from the opening relative to the first opening portion, and the end cap being connected to the first opening portion and sealing the opening; and the electrode assembly is arranged in the casing body and comprises a negative electrode sheet, the negative electrode sheet comprising a negative electrode active material, the negative electrode active material comprising a silicon-based material, and the maximum thickness of the first opening portion being greater than the thickness of the first body portion. On the basis of the technical solution provided in the embodiments of the present application, the reliability of the battery can be improved.

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This application relates to a solar cell module and a method for preparing the same, a photovoltaic device, an electrical device, and a power generation device. In two adjacent sub-cells, a conductor is connected to a conductive layer of one sub-cell, with at least a portion protruding beyond at least one end of the conductive layer along a second direction. The electrode layer of the other sub-cell can connect with the protruding portion of the conductor outside the sub-cell, achieving series connection between the two sub-cells outside the sub-cells. This eliminates the need for the conventional two scribing operations before electrode layer deposition to achieve series connection, requiring only a cutting operation between sub-cells. Such a design, by providing a conductor protruding at least one end of the conductive layer along the second direction, eliminates the two scribing operations before sub-cell series connection, facilitating a single-cut preparation method, simplifying the preparation process, and improving preparation efficiency. Additionally, eliminating the two scribing operations reduces the likelihood of increased series resistance between sub-cells, thereby enhancing module performance.

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A battery cell, a battery, and an electric device. The battery cell comprises a casing, a pressure relief structure, and an electrode assembly. The casing is provided with a first wall. The pressure relief structure is disposed on the first wall. The electrode assembly is a wound electrode assembly and is disposed in the casing, and the electrode assembly comprises a flat portion and a first bending portion. Along a first direction, the first bending portion is disposed on the side of the flat portion facing the first wall. A first boundary line is provided between the first bending portion and the flat portion. The distance between the first boundary line and the first wall is L, wherein L ≥ 5 mm. The first direction is perpendicular to the axial direction of the electrode assembly.

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A silicon-carbon negative electrode material and a preparation method therefor are provided. the silicon-carbon negative electrode material includes a carbon skeleton having a pore structure and a silicon-based material arranged in the pore structure, where in a region formed by extending from a surface of the silicon-carbon negative electrode material inward by 10 nm away from the surface, a content of high-valence silicon is less than 25% relative to a total amount of low-valence silicon and the high-valence silicon, where the low-valence silicon is silicon with a valence of 0 to 2, and the high-valence silicon is silicon with a valence of 3 to 4. For the silicon-carbon negative electrode material, the specific delithiated capacity and the initial coulombic efficiency of the silicon-carbon negative electrode material can be improved, and the specific discharge capacity and the initial coulombic efficiency of a secondary battery can be enhanced.

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An aluminum alloy material, an aluminum alloy structural component, a preparation method of an aluminum alloy structural component, a battery box, a battery system, an electric apparatus (6), and an application are provided. By mass percentage, the aluminum alloy material includes silicon element, copper element, titanium element, magnesium element, zinc element, manganese element, strontium element, a matrix element Al, and unavoidable impurity elements. The aluminum alloy material includes no Al<2>Cu phase or includes a small amount of Al<2>Cu phase.

A battery case (100), a battery (200), and an electric device (1000). The battery case (100) comprises a first case portion (1), a second case portion (2), a first sealing member (3), and first fastening members (4); the first case portion (1) and the second case portion (2) are sealedly connected to form a sealed cavity (101), the first case portion (1) comprises a first sealing surface (10), the second case portion (2) comprises a second sealing surface (20), and the first sealing surface (10) and the second sealing surface (20) match to each other to form a sealing interface; the first sealing member (3) is arranged at the sealing interface to seal the first sealing surface (10) and the second sealing surface (20); the first fastening members (4) pass through the first sealing surface (10) and the second sealing surface (20) to connect the first sealing surface (10) and the second sealing surface (20) to clamp the first sealing member (3), so that the first sealing surface (10) and the second sealing surface (20) are sealedly connected; the first fastening members (4) are completely located on the outer side of the sealed cavity (101), and in the direction of extension of the sealing interface, the first fastening members (4) are located on the side of the first sealing member (3) away from the sealed cavity (101).

A battery (100), a battery management system (400), and an electric device (500). The battery (100) comprises: a case (10); a liquid leakage detection member (20), the liquid leakage detection member (20) being arranged in the case (1) to detect liquid in the case (10), and the liquid leakage detection member (20) being adapted to be communicationally connected to a control device (200) so that the control device (200) controls an alarm device (300) to operate; and a liquid drainage member (30), the liquid drainage member (30) being arranged in the case (10), and the liquid drainage member (30) being fixedly arranged on the bottom wall (11) of the case (10).

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Disclosed are an electrolyte, a lithium secondary battery, and an electric device. The electrolyte includes a first solvent, a silane compound containing a carbon-carbon double bond, and a cyclic lithium borate compound. The first solvent includes a cyclic carbonate compound. Based on a total mass of the electrolyte, a mass content W3 of the cyclic carbonate compound, a mass content W1 of the silane compound containing a carbon-carbon double bond, and a mass content W2 of the cyclic lithium borate compound satisfy: 0.001 ≤ (W1+W2)/W3 ≤ 2.67. The silane compound containing a carbon-carbon double bond and the cyclic lithium borate compound are used in combination, which can improve the flexibility and thermal stability of an SEI film, thereby reducing the degree of gas production of the lithium secondary battery during the processes of cycling and storage and improving the storage performance, fast charge performance and cycling performance of the lithium secondary battery.

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A terminal post welding device (500) and a battery assembling system (1), wherein the terminal post welding device (500) comprises: a battery cell fixing assembly (510), a first tab pressing plate unit (520a) and a welding assembly (515), wherein the battery cell fixing assembly (510) is used to support and fix a battery cell (100) arranged in a lying-down state; the first tab pressing plate unit (520a) comprises a first driving assembly (521) and a first tab pressing plate (522), the first tab pressing plate (522) is mounted on the first driving assembly (521), and the first driving assembly (521) is used to drive the first tab pressing plate (522) to move so that the first tab pressing plate (522) presses the tab portion (1030) of the battery cell (100) onto the terminal post (104) of the battery cell (100); the welding assembly (515) is configured to weld the tab portion (1030) and the terminal post (104) that are pressed together.

The present application discloses a tab-through device, assembly apparatus, and assembly method for a battery. The battery includes a housing and an electrode assembly. The housing is provided with an accommodation chamber, and a through hole is formed in the housing. The electrode assembly is arranged in the accommodation chamber. The tab-through device is configured to guide a tab part of the electrode assembly to extend out of the through hole. The tab-through device includes a clamping mechanism and a driving mechanism. The driving mechanism is configured to drive the clamping mechanism to clamp the tab part within the accommodation chamber to extend out of the accommodation chamber through the through hole. According to the above method, the present application can effectively reduce the assembly difficulty of the battery.

The present application discloses a tab-through device, assembly apparatus (3), and assembly method for a battery. The battery includes a housing and an electrode assembly. The housing is provided with an accommodation chamber, and a through hole is formed in the housing. The electrode assembly is arranged in the accommodation chamber. The tab-through device is configured to guide a tab part of the electrode assembly to extend out of the through hole. The tab-through device includes a guiding member and a support mechanism. The support mechanism is connected to the guiding member. The guiding member is configured to extend into the accommodation chamber and guide the tab part to extend out of the accommodation chamber through the through hole. According to the above method, the present application can effectively reduce the assembly difficulty of the battery.

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