CATL Patente

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The present application discloses a current collector disc processing method, a current collector disc, a battery cell, and an electrical apparatus. The current collector disc processing method includes: a punching step of providing a first sheet stock; a stacking step of providing a second sheet stock and stacking the second sheet stock with the first sheet stock; a welding step of welding the first sheet stock and the second sheet stock in a welding region; and a cutting step of obtaining the current collector disc. According to the current collector disc processing method, the current collector disc, the battery cell, and the electrical apparatus provided in the present application, the current collector disc is obtained by sequentially undergoing the punching step, the stacking step, the welding step, and the cutting step, and does not require positioning structures to be arranged on an annular sheet and a connecting disc, which is conducive to simplifying the structure of the current collector disc, improving the positional accuracy of the annular sheet and the connecting disc in the current collector disc, and simplifying the production and assembly process of the current collector disc.

A buffer member (10), a battery cell (100), a battery (1000), and an electrical apparatus (2000). The buffer member (10) is used inside the battery cell (100), and the battery cell (100) comprises an electrode assembly (20). The buffer member (10) comprises: a first surface (11) and a second surface (12) which are arranged opposite to each other; and through channels (14) penetrating through the first surface (11) and the second surface (12), wherein the buffer member (10) can be compressed for buffering the expansion of the electrode assembly (20), and the through channels (14) are used for increasing the compressibility of the buffer member (10).

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A conveying apparatus. A conveying apparatus (100) is used for conveying a plurality of electrode sheets (200) formed by cutting. The conveying apparatus (100) comprises a plurality of conveying roller sets (10) and an offset mechanism (20); each conveying roller set (10) comprises at least one conveying roller (11), and each conveying roller (11) is used for conveying one electrode sheet (200); and the offset mechanism (20) is adapted to be connected to at least one electrode sheet (200), and in the width direction of the electrode sheet (200), the offset mechanism (20) is used for offsetting two adjacent electrode sheets (200) from each other. According to the conveying apparatus, the probability of mutual friction between two electrode sheets is reduced, so that damage, scratches or pollution of the surface of an electrode sheet is reduced, thus improving the quality and performance of a produced battery cell. Further provided is a winding device comprising the conveying apparatus.

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A buffer pad (200), a battery cell (100), a battery (1000), and an electric apparatus (2000) are provided. The buffer pad (200), used inside the battery cell (100), includes a plurality of buffer members (20), where the plurality of buffer members (20) are arranged along a first direction, and two adjacent buffer members (20) have different rebound rates under a same pressure.

The present application relates to a high-voltage direct-mount energy storage system, a control method for an energy storage apparatus, and a control apparatus for an energy storage apparatus. The high-voltage direct-mount energy storage system may include: a clamping circuit; an energy storage apparatus, including a first energy storage main line, at least two energy storage sub-modules connected to the first energy storage main line, at least one dielectric branch, a first node disposed on the first energy storage main line, and a first grounding circuit connected to the first node, with a resistance value of the first grounding circuit being less than a preset resistance threshold; and a control apparatus, configured to control target engaged energy storage sub-modules on the two sides of the first node to be in a connected state based on an expected voltage of the energy storage apparatus and measured voltages of at least two energy storage sub-modules connected to the first energy storage main line. Embodiments of the present application can improve the stability of the voltage at the two ends of the energy storage apparatus, thereby facilitating improvement of operational reliability of components within the energy storage apparatus.

A battery cell, a battery and an electric device, which belongs to the technical field of batteries. The battery cell includes a first shell wall, a terminal and an insulating and sealing structure, where the terminal includes a passing portion and a first extending portion; the first extending portion extends to the outside of an outer surface or the inside of an inner surface of the first shell wall; a first corner arranged towards the first shell wall is provided at the connection between the first extending portion and the passing portion; the first shell wall includes a second corner corresponding to the first corner; the insulating and sealing structure is fitted between the first shell wall and the terminal and includes a first part and a second part; and the material hardness of the first part is lower than that of the second part, and the first part is arranged closer to at least one of the first corner and the second corner than the second part.

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A battery cell, a battery, and an electric device. The battery cell comprises: a shell; at least one electrode assembly, which is disposed inside the shell; and at least one elastic buffer pad, which is arranged on at least part of the surface of the electrode assembly and/or inside the electrode assembly, wherein the compression ratio of the elastic buffer pad in the thickness direction thereof is less than or equal to 30% under a pressure of 0.1 MPa, and the compression rate of the elastic buffer pad in the thickness direction thereof is greater than or equal to 50% under a pressure of 1 MPa.

A battery cell, a battery, and an electric device, relating to the technical field of batteries. The battery cell comprises: a first shell wall, a pole, a first insulating seal, and a pad, wherein the pole comprises a penetration part and a first extension part, the first extension part extends to the outer side of the outer surface of or the inner side of the inner surface of the first shell wall, the penetration part and the first extension part constitute a first pole part, the first insulating seal is matched between the first pole part and the first shell wall, and the pad is arranged between the first pole part and the first shell wall and used for buffering the acting force applied to the first insulating seal by at least one of the first pole part and the first shell wall.

Disclosed in the present application are a winding member assembly, a winding device and a winding method. The winding member assembly comprises a first winding member and second winding members, the first winding member comprising two first sub-winding members capable of moving with respect to each other in a first direction, and the second winding members being respectively arranged on the two sides of the first winding member in a second direction. In a first state, the outer peripheral walls of the second winding members and the outer peripheral walls of the first sub-winding members are located on the same preset cylindrical surface. In a second state, the second winding members are located inside the preset cylindrical surface, and at least part of each second winding member extends into accommodating chambers via corresponding mating ports, such that the width of the winding member assembly in the second direction in the second state is smaller than the width of the winding member assembly in the second direction in the first state.

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The present application discloses a limiting mechanism (100) and an energy storage device. The limiting mechanism (100) comprises: a connecting seat (10) provided with a guide structure (1101), wherein the guide structure (1101) is arranged in the length direction of the connecting seat (10); a connecting shaft (20) in sliding fit with the guide structure (1101); and a connecting arm (30) connected to the connecting shaft (20). A locking position (1102) for locking the position of the connecting shaft (20) in the length direction of the connecting seat (10) is further provided on the connecting seat (10). When the connecting arm (30) and the connecting seat (10) are unfolded, the connecting shaft (20) can slide along the guide structure (1101) to adapt to the unfolding angle between the connecting arm (30) and the connecting seat (10), and when the connecting shaft (20) slides to the locking position (1102), the locking position (1102) can lock the position of the connecting shaft (20), so that the position of the connecting shaft (20) is kept stable, and the unfolding angle between the connecting arm (30) and the connecting seat (10) is locked, thereby locking the opening degree of a door (300).

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The present application relates to a pole piece folding control method and apparatus, a pole piece folding apparatus, and a battery production system. During the folding process of a pole piece group, a conveying component is controlled to operate, and the pole piece group is driven to move towards a stacking platform. When a lamination area on the stacking platform starts to fold or has been folded, at least one of the conveying component and the stacking plaform is controlled to move such that the distance between a conveying end of the conveying component and at least part of an operating surface of the stacking platform is pulled open. In this way, a clearance space can be provided for folding of the lamination area, thereby facilitating stress relief of the lamination area during folding, reducing a pulling force of the lamination area in a folded state on a non-folded lamination area, and reducing a degree of bending and warping of the lamination area at a folding position. Thus, the probability of abnormal gaps being generated at the folding position of a laminated structure is reduced, thereby effectively reducing the probability of lithium deposition at the folding position of the electrode, and improving the quality of the laminated battery.

The present application provides a battery cell, a battery, and an electrical apparatus, which belongs to the field of battery technologies. The battery cell includes a shell, an electrode terminal, and an electrode assembly. The shell has a wall portion. The electrode terminal is mounted on the wall portion in an insulated manner. The electrode assembly is accommodated in the shell, and the electrode assembly includes a main body part, a first tab, and a second tab. The first tab and the second tab have opposite polarities. In a thickness direction of the wall portion, the first tab and the second tab are both arranged at one end of the main body part facing the wall portion. The wall portion has a first surface facing the electrode assembly, a connecting portion is arranged to protrude from the first surface, the connecting portion is electrically connected to the first tab, and the electrode terminal is electrically connected to the second tab. This type of battery cell is conducive to optimizing the height of the first tab protruding from the main body part, and is capable of improving the contact effect between the connecting portion and the first tab, and there is no need to arrange a component of a special-shaped structure connecting the wall portion and the first tab between the wall portion and the first tab, so as to reduce the difficulty of assembling the battery cell.