Battery cell, battery, electrical apparatus and energy storage apparatus

Abstract

A battery cell (10), a battery (100), an electrical apparatus and an energy storage apparatus (2000). The battery cell (10) comprises a housing (1) having an accommodation space (12), the housing (1) comprising a first housing wall (11); an electrode assembly (7), at least partially arranged in the accommodation space (12); and an electrode terminal (3), arranged on the first housing wall (11), the electrode terminal (3) being provided with a terminal plate (4), the terminal plate (4) being used for being connected to a busbar (2), the terminal plate (4) comprising a main body part (5) and at least one extension part (6) connected to the main body part (5), and the at least one extension part (6) protruding from the main body part (5) in a direction perpendicular to the wall thickness direction (Z) of the first housing wall.

Description

Battery cells, batteries, electrical devices and energy storage devices Technical Field

[0001] This disclosure relates to the field of battery technology, specifically to a battery cell, a battery, an electrical device, and an energy storage device. Background Technology

[0002] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are being used more and more in the field of energy storage.

[0003] In existing battery systems, batteries consist of electrode assemblies and electrode terminals. The electrode assemblies provide power through electrical connections between the tabs and the electrode terminals. Heat from the welding points between the tabs and the electrode terminals, as well as the welding points within the internal structure of the electrode terminals, is primarily transferred to the outside through the electrode terminals. As the demands for fast-charging technology for batteries increase, the requirements for heat dissipation at the electrode terminals also become more stringent. Improving the heat dissipation effect of the electrode terminals is one of the research directions in the industry.

[0004] Summary of the Invention

[0005] In view of this, the present disclosure aims to provide a battery cell, battery, power device, and energy storage device that can improve the heat dissipation effect of the electrode terminals.

[0006] To achieve the above objectives, the present disclosure adopts the following technical solution.

[0007] A first aspect of this disclosure provides a battery cell, comprising: a housing having a receiving space, the housing including a first housing wall; an electrode assembly at least partially disposed in the receiving space; and an electrode terminal disposed on the first housing wall, the electrode terminal having a terminal plate for connection to a busbar, the terminal plate including a main body and at least one extension connected to the main body, the at least one extension protruding from the main body along a direction perpendicular to the wall thickness of the first housing wall.

[0008] The extension protrudes from the main body along the wall thickness direction perpendicular to the first housing wall, which increases the contact area between the terminal plate and the air, thereby increasing the contact area between the electrode terminals and the air, thus increasing the heat dissipation area, improving the heat dissipation performance of the electrode terminals, and further improving the performance of the battery cell.

[0009] In some embodiments, the extension protrudes from the main body along the length of the first housing wall, and the length of the extension is greater than the length of the main body.

[0010] This increases the length of the extension along the length of the first housing wall, increases the circumference of the terminal plate, and increases the contact area between the terminal plate and the air, thereby increasing the heat dissipation area, improving the heat dissipation capacity of the electrode terminals, and thus improving the performance of the battery cell.

[0011] In some embodiments, the battery cell includes at least two electrode terminals, the at least two electrode terminals including a first electrode terminal and a second electrode terminal, the first electrode terminal including a first body portion and a first extension portion, the second electrode terminal including a second body portion and a second extension portion, the first extension portion and the second extension portion extending along the length direction of the first housing wall toward a side closer to each other; or, the first extension portion and the second extension portion extending along the length direction of the first housing wall toward a side farther from each other; or, the first extension portion and the second extension portion extending along the length direction of the first housing wall toward the same side.

[0012] Having at least two electrode terminals increases the contact area between the electrode terminals and the air, improves the heat dissipation capacity of the electrode terminals, and thus improves the performance of the battery cell. The first and second extensions can extend in various directions, increasing the flexibility of their arrangement.

[0013] In some embodiments, the terminal block includes a plurality of extensions.

[0014] A terminal board can be configured with at least two extensions, thereby increasing the heat dissipation area of ​​the terminal board, improving the heat dissipation capacity of the electrode terminals, and thus improving the performance of the battery cell.

[0015] In some embodiments, the plurality of extensions extend from the same side of the main body along the length direction of the first housing wall.

[0016] When a terminal block has at least two extensions, the extension directions of the extensions can be the same or opposite, which improves the flexibility of the extension arrangement.

[0017] In some embodiments, the ratio of the length of the extension to the length of the main body is in the range of 0.4 to 0.8 along the width direction of the first housing wall.

[0018] Therefore, a single main body can be provided with multiple extensions, increasing the number of extensions. While maintaining the same heat dissipation effect, the volume of the extensions can be reduced, lowering the weight of individual battery cells and reducing production costs. By maintaining the length ratio of the extension to the main body within the range of 0.4 to 0.8 along the width direction of the first housing wall, both the number of extensions and the size of each individual extension are considered, thereby improving heat dissipation performance.

[0019] In some embodiments, the first electrode terminal includes a first terminal plate, and the second electrode terminal includes a second terminal plate. Along the width direction of the first housing wall, the ratio of the length of the first terminal plate and the second terminal plate to the length of the first housing wall is in the range of 0.6 to 0.9.

[0020] It can increase the width of the terminal plate along the width direction of the first housing wall, thereby providing multiple extensions to the terminal plate and improving the heat dissipation capacity of the electrode terminals.

[0021] In some embodiments, the terminal board includes a first terminal board and a second terminal board, the first terminal board includes a first extension, the second terminal board includes a second extension, and along the length direction of the first housing wall, the ratio of the length of the first extension to the length of the first terminal board is greater than or equal to 0.5 and less than 1; and / or, along the length direction of the first housing wall, the ratio of the length of the second extension to the length of the second terminal board is greater than or equal to 0.5 and less than 1.

[0022] Along the length of the first housing wall, the size of the first extension portion relative to the first terminal plate is increased, and / or the size of the second extension portion relative to the second terminal plate is increased. This increases the size of the extension portion, thereby increasing its heat dissipation area and effectively improving the heat dissipation performance of the electrode terminals.

[0023] In some embodiments, the terminal block includes a first terminal block and a second terminal block, wherein the length of the first terminal block is in the range of 0.2 to 0.7 relative to the length of the first housing wall; and / or, the length of the second terminal block is in the range of 0.2 to 0.7 relative to the length of the first housing wall.

[0024] The size of the terminal plate is increased along the length of the first housing wall, thereby increasing the heat dissipation area of ​​the terminal plate and effectively improving the heat dissipation performance of the electrode terminals.

[0025] In some embodiments, the terminal block includes a first terminal block and a second terminal block, wherein the ratio of the length of the first terminal block along the length direction of the first housing wall to the length of the first terminal block along the width direction of the first housing wall is in the range of 3.5 to 10; and / or, the ratio of the length of the second terminal block along the length direction of the first housing wall to the length of the second terminal block along the width direction of the first housing wall is in the range of 3.5 to 10.

[0026] The terminal block is designed to be long and thin, which helps to increase the heat dissipation area of ​​the terminal block and further improve the heat dissipation performance of the electrode terminals.

[0027] In some embodiments, the first electrode terminal includes a first terminal plate, at least a portion of which is disposed on the side of the first housing wall opposite to the receiving space, and the second electrode terminal includes a second terminal plate, which is disposed on the side of the first housing wall opposite to the receiving space.

[0028] Therefore, it can be connected to busbars and other components, enabling electrical connection with external structures.

[0029] In some embodiments, the first electrode terminal includes a first terminal disk, at least a portion of which is disposed on the side of the first housing wall facing the receiving space; the second electrode terminal includes a second terminal disk, at least a portion of which is disposed on the side of the first housing wall facing the receiving space; and the first terminal disk is at least a portion disposed between the second terminal disk and the first housing wall along the wall thickness direction of the first housing wall; or, the second terminal disk is at least a portion disposed between the first terminal disk and the first housing wall along the wall thickness direction of the first housing wall.

[0030] Since the electrode terminals include a terminal plate located outside the casing of the battery cell and a terminal disc located inside the casing, the electrode terminals can be easily connected to the tabs of the electrode assembly via the terminal disc. Furthermore, by designing the terminal plate to be larger, heat dissipation, support for the first casing wall, and connection strength with the busbar can be improved. The shapes of both the terminal plate and the terminal disc offer a high degree of design freedom. Moreover, the terminal plate and terminal disc clamp the first casing wall from both the inner and outer sides of the casing, respectively, which improves the bending strength of the first casing wall.

[0031] In some embodiments, the first electrode terminal further includes a first terminal disk, at least a portion of which is disposed on the side of the first housing wall facing the receiving space; the second electrode terminal further includes a second terminal disk, at least a portion of which is disposed on the side of the first housing wall facing the receiving space; the first body portion and the first terminal disk are directly connected by a first connecting post; the second body portion and the second terminal disk are directly connected by a second connecting post.

[0032] Since the terminal block and terminal plate can be connected together via connecting posts, they can function as electrode terminals to draw current from the electrode assembly. Furthermore, the connecting posts are located in the main body, allowing the electrode terminals to be reliably fixed to the first housing wall within the main body.

[0033] In some embodiments, the electrode assembly includes a first electrode and a second electrode with opposite polarities, wherein the first electrode terminal is electrically connected to the first electrode and the second electrode terminal is electrically connected to the second electrode.

[0034] This allows for the placement of electrode terminals with opposite polarities on the first casing wall of the battery cell, which helps reduce the space occupied by busbars and other components. It also facilitates the placement of heat exchange components and other structural components on the other casing walls of the battery cell, thereby improving the volume utilization rate of the battery.

[0035] In some embodiments, along the wall thickness direction of the first housing wall, the second terminal plate is at least partially disposed between the first terminal plate and the first housing wall, and the first terminal plate abuts against the second terminal plate.

[0036] Therefore, by setting the first terminal plate and the second terminal plate to engage with each other, the bending strength of the electrode terminals and the first housing wall can be further improved; moreover, the first terminal plate and the second terminal plate can be electrically connected to each other, which facilitates the simplification of the connection structure when the two electrode terminals have the same polarity.

[0037] In some embodiments, the first terminal plate has a first protrusion and the second terminal plate has a first recess, the first protrusion and the first recess at least partially overlap along the wall thickness direction of the first housing wall, and the first protrusion and the first recess cooperate with each other.

[0038] Therefore, the cooperation between the first protrusion and the first recess facilitates the support and fixation of the first electrode terminal on the second electrode terminal, improves the bending strength of the second electrode terminal, and facilitates processing; by setting the first protrusion in the first recess, the space occupied by the first protrusion is reduced, thereby improving space utilization.

[0039] In some embodiments, the battery cell further includes a first insulating member, the first insulating member being fixed to a first electrode terminal, and the second electrode terminal being at least partially disposed between the first insulating member and the first housing wall, with the first insulating member abutting against the second electrode terminal.

[0040] This allows the first electrode terminal and the second electrode terminal to be insulated from each other. Therefore, even if the first electrode terminal and the second electrode terminal have opposite polarities, the first insulating member can still abut against the second electrode terminal, thereby improving the bending resistance of the second electrode terminal. Moreover, if the first insulating member has suitable strength, it can limit the bending deformation of the second electrode terminal.

[0041] In some embodiments, the first insulating portion is disposed between the first electrode terminal and the first housing wall.

[0042] This allows the first electrode terminal to be insulated from the first housing wall.

[0043] In some embodiments, along the wall thickness direction of the first housing wall, the first electrode terminal, the first insulating member, and the second electrode terminal partially overlap, and the portion of the first electrode terminal that overlaps with the first insulating member and the second electrode terminal abuts against the first insulating member.

[0044] Therefore, the bending deformation of the second electrode terminal can be restricted by the first electrode terminal and the first insulating member, and the first electrode terminal and the second electrode terminal are insulated from each other, thereby further strengthening the support and fixation of the first electrode terminal on the second electrode terminal and improving the bending deformation resistance of each electrode terminal; it can also strengthen the strength of the area in the first housing wall where the electrode terminals are located; in addition, the polarity setting of the electrode terminals has a high degree of freedom.

[0045] In some embodiments, the first extension is connected to the first terminal block via a third connecting post, the first recess is disposed on the side of the second extension facing the first electrode terminal, and the first protrusion is disposed on the side of the first extension facing the second electrode terminal.

[0046] Therefore, the first recess in the second extension can be abutted against by the first protrusion in the first main body and fixed between the first protrusion and the first housing wall, thereby preventing the second extension from warping away from the first housing wall due to its longer extension, and improving the bending strength of the second extension and the entire second electrode terminal. Even if the busbar or other components exert tensile force on the electrode terminal, the electrode terminal is not easily bent or broken, improving the connection reliability between the busbar and the electrode terminal.

[0047] In some embodiments, the first recess includes a first stepped portion and a second stepped portion, the second stepped portion being disposed on the side of the first stepped portion away from the first terminal plate; the first protrusion includes an extension provided by the first terminal plate along the wall thickness direction of the first housing wall, a portion of the second terminal plate being located between the extension and the first housing wall, the extension being at least partially accommodated in the stepped space formed by the first stepped portion; the first protrusion also includes a first covering portion provided by the first insulating member along the wall thickness direction of the first housing wall, a portion of the second terminal plate being located between the first covering portion and the first housing wall, the first covering portion being at least partially accommodated in the stepped space formed by the second stepped portion.

[0048] Therefore, the bending deformation of the second electrode terminal can be limited by the cooperation between the protrusion and the first step portion, and the protrusion is at least partially accommodated in the first step portion to reduce the space occupied by the protrusion and improve space utilization. By providing the first cover portion, the creepage distance on the surfaces of the first electrode terminal and the second electrode terminal can be increased, improving insulation reliability. Moreover, by accommodating the first cover portion in the step portion, the first cover portion does not occupy additional space, thereby improving space utilization.

[0049] In some embodiments, along the wall thickness direction of the first housing wall, the surface of the first cover portion on the side opposite to the first housing wall does not extend beyond the surface of the first terminal plate on the side opposite to the housing wall; and / or, along the wall thickness direction of the first housing wall, the surface of the first cover portion on the side opposite to the first housing wall does not extend beyond the surface of the second terminal plate on the side opposite to the first housing wall.

[0050] Since the surface of the first cover portion facing away from the first housing wall does not extend beyond the surface of the first terminal plate and / or the second terminal plate facing away from the first housing wall, the first cover portion does not protrude from the first terminal plate and / or the second terminal plate, thereby reducing the size of the battery cell and even the battery pack along the wall thickness direction of the first housing wall; and to a certain extent, it avoids interference between the first cover portion and the busbar, making it easier for the busbar and the like to be reliably connected to the first terminal plate and the second terminal plate.

[0051] In some embodiments, along the wall thickness direction of the first housing wall, the height difference between the surface of the first terminal plate facing away from the housing wall and the surface of the second terminal plate facing away from the first housing wall is greater than or equal to 0 and does not exceed 0.5 mm.

[0052] Therefore, the first terminal plate and the second terminal plate are almost flush, which helps to share the external pressure and improve the resistance to deformation.

[0053] In some embodiments, the battery cell further includes a second insulating member, which is at least partially located between the second electrode terminal and the first housing wall.

[0054] This allows the second electrode terminal to be insulated from the casing of the battery cell, thus making it suitable not only for designs where the casing is charged but also for designs where the casing is not charged.

[0055] In some embodiments, the first insulating member and the second insulating member are integrally molded parts.

[0056] This reduces the number of parts and simplifies the assembly process.

[0057] In some embodiments, a first recess and a second recess are formed in the first housing wall, and at least a portion of the first insulating member and at least a portion of the second insulating member are located in the first recess and the second recess, respectively.

[0058] By embedding at least a portion of the first insulating member and at least a portion of the second insulating member into the recess on the first housing wall, it is beneficial to improve the installation strength of the insulating member relative to the first housing wall, reduce the possibility of the insulating member shifting along the surface of the first housing wall, and facilitate the positioning of the insulating member and the first housing wall during assembly.

[0059] In some embodiments, the first recess and the second recess form the same recess.

[0060] This reduces the number of parts and simplifies the assembly process.

[0061] In some embodiments, the first recess is disposed on the side of the second extension facing the first electrode terminal, and the first protrusion is disposed on the side of the first body facing the second electrode terminal.

[0062] Therefore, the first recess in the second extension can be abutted against by the first protrusion in the first main body and fixed between the first protrusion and the first housing wall, thereby preventing the second extension from warping away from the first housing wall due to its longer extension, and improving the bending strength of the second extension and the entire second electrode terminal. Even if the busbar or other components exert tensile force on the electrode terminal, the electrode terminal is not easily bent or broken, improving the connection reliability between the busbar and the electrode terminal.

[0063] In some embodiments, the first electrode terminal is further provided with a second recess, and the second electrode terminal is further provided with a second protrusion. The second protrusion and the second recess overlap at least partially along the wall thickness direction of the first housing wall. The second protrusion and the second recess cooperate with each other. The second recess is disposed on the side of the first extension facing the second electrode terminal, and the second protrusion is disposed on the side of the second main body facing the first electrode terminal.

[0064] Therefore, the cooperation between the second protrusion and the second recess facilitates the support and fixation of the second electrode terminal on the first electrode terminal, improves the bending strength of the first electrode terminal, and facilitates processing; by setting the second protrusion in the second recess, the space occupied by the second protrusion is reduced, thereby improving space utilization.

[0065] In some embodiments, the second recess includes a third step and a fourth step, the fourth step being disposed on the side of the third step away from the second electrode terminal; the second protrusion includes a protrusion provided by the second battery terminal along the wall thickness direction of the first housing wall, a portion of the first electrode terminal being located between the protrusion and the first housing wall, the protrusion being at least partially accommodated in the step space formed by the third step; the second protrusion further includes a second cover provided by the second insulating member along the wall thickness direction of the first housing wall, a portion of the first electrode terminal being located between the second cover and the first housing wall, the second cover being at least partially accommodated in the step space formed by the fourth step.

[0066] Therefore, the bending deformation of the first electrode terminal can be limited by the cooperation between the protrusion and the third step, and the protrusion is at least partially accommodated in the third step to reduce the space occupied by the protrusion and improve space utilization. By providing the second cover, the creepage distance on the surfaces of the first and second electrode terminals can be increased, improving insulation reliability. Moreover, by accommodating the second cover in the step, the second cover does not occupy additional space, thereby improving space utilization.

[0067] In some embodiments, the minimum cross-sectional area through which the current passes in the extension is S1, and the capacity of the battery cell is P, then the ratio of S1 to P is in the range of 0.2 to 0.3, wherein the unit of the capacity is Ah.

[0068] The ratio of S1 to P is set within a suitable range so that the extension has a suitable flow capacity.

[0069] In some embodiments, along the length direction of the first housing wall, the first extension and the second extension are located between the first main body and the second main body; along the width direction of the first housing wall, the first extension and the second extension have a first overlapping portion.

[0070] Therefore, by arranging the first extension and the second extension to overlap in the width direction of the first housing wall, the bending strength of the area in the first housing wall where the electrode terminals are located can be improved by utilizing the synergistic effect of the two electrode terminals. Moreover, the first electrode terminal and the second electrode terminal can be arranged as compactly as possible, which is beneficial for utilizing the non-electrode terminal area of ​​the first housing wall, thereby improving the volume utilization rate of the battery pack.

[0071] In some embodiments, the material of the first main body portion and / or the second main body portion is different from the material of the first overlapping portion.

[0072] This allows for the selection of materials for the first and second main bodies, which helps reduce current loss and improve heat dissipation.

[0073] In some embodiments, the length of the first housing wall along the length direction of the first housing wall is L, and the length of the first overlapping portion along the length direction of the first housing wall is A, then A is in the range of 10% to 40% of L.

[0074] Therefore, setting the first overlapping portion to be longer is beneficial to improving the strength of the electrode terminal setting area in the first housing wall and even the entire first housing wall.

[0075] In some embodiments, the length of the first overlapping portion along the length direction of the first housing wall is A, and A is in the range of 3 mm to 50 mm.

[0076] Therefore, setting the first overlapping portion to be longer is beneficial to improving the strength of the electrode terminal setting area in the first housing wall and even the entire first housing wall.

[0077] In some embodiments, the first main body portion and the second main body portion have a second overlapping portion along the length direction of the first housing wall.

[0078] Therefore, since the first housing wall has overlapping portions in both the length and width directions, the first electrode terminal and the second electrode terminal can be arranged compactly in both the length and width directions of the first housing wall, and the bending strength of the first housing wall can be further improved.

[0079] In some embodiments, the dimension of the first housing wall along the width direction is W, and the length of the second overlapping portion along the width direction of the first housing wall is B, then B is in the range of 20% to 90% of W.

[0080] Therefore, setting the length of the second overlapping region along the width direction of the first shell wall to be relatively long is beneficial to enhancing the strength of the first shell wall.

[0081] In some embodiments, the closest distance between the first electrode terminal and the second electrode terminal is greater than or equal to 0.3 mm along the length and width directions of the first housing wall. This reduces the possibility of short-circuiting between the first electrode terminal and the second electrode terminal.

[0082] In some embodiments, the first electrode terminal includes a first terminal plate, the second electrode terminal includes a second terminal plate, both the first terminal plate and the second terminal plate include a connection area for connection with a busbar, the busbar being used to electrically connect a plurality of the battery cells to each other, the connection area being formed at least in the first overlapping portion.

[0083] Therefore, the busbar is connected to the portion that forms the first overlapping part between the first electrode terminal and the second electrode terminal. Since this portion has strong bending strength, even if the busbar causes bending stress to act on the first electrode terminal, the second electrode terminal, and the first housing wall, the first electrode terminal, the second electrode terminal, and the first housing wall are not easily bent or deformed, and are even less likely to break due to bending deformation.

[0084] In some embodiments, the connection area is also formed in at least one of the first body portion and the second body portion.

[0085] This can further enhance the connection strength between the electrode terminals and the busbar, further disperse the bending stress caused by the busbar, and further improve the deformation resistance of the electrode terminals and the first housing wall.

[0086] In some embodiments, if the area of ​​the connection region of the first overlapping portion is SA and the area of ​​the entire connection region is S, then SA accounts for 50% to 100% of S.

[0087] Therefore, in addition to being set in the extension section, the connection area can also be set in the non-extension section. The setting of the connection area is highly flexible, which helps to increase the area of ​​the connection area, improve the connection strength, and increase the flow area.

[0088] In some embodiments, if the offset distance of the centerline position of the connection area formed in the first extension in the width direction of the first housing wall relative to the centerline position of the first housing wall in the width direction of the first housing wall is B3, then B3 is in the range of 15% to 27% of W.

[0089] By setting B3 to be no less than 15% of W, the first extension is made to have a sufficient distance from the center, which helps to ensure a sufficient safe distance between the first extension and the second extension; by setting B3 to be no greater than 27% of W, the first extension is made to have a certain distance from the edge of the first housing wall.

[0090] In some embodiments, the electrode terminal includes a first electrode terminal and a second electrode terminal. The first electrode terminal has a first protrusion, and the second electrode terminal has a first recess. The first protrusion and the first recess at least partially overlap along the wall thickness direction of the first housing wall, and the first protrusion and the first recess cooperate with each other.

[0091] Therefore, the cooperation between the first protrusion and the first recess facilitates the support and fixation of the first electrode terminal on the second electrode terminal, improves the bending strength of the second electrode terminal, and facilitates processing; by setting the first protrusion in the first recess, the space occupied by the first protrusion is reduced, thereby improving space utilization.

[0092] In some embodiments, the electrode terminal includes a first electrode terminal and a second electrode terminal. The first electrode terminal includes a first terminal plate, at least a portion of which is disposed on the side of the first housing wall opposite to the receiving space. The second electrode terminal includes a second terminal plate, which is disposed on the side of the first housing wall opposite to the receiving space. Along the wall thickness direction of the first housing wall, the first terminal plate and the second terminal plate partially overlap, and the first terminal plate directly or indirectly abuts against the second terminal plate.

[0093] Therefore, by setting the first terminal plate and the second terminal plate to interlock, the bending strength of the electrode terminals and the first housing wall can be further improved; moreover, the first terminal plate and the second terminal plate can be electrically connected to each other, which facilitates the simplification of the connection structure when the two electrode terminals have the same polarity.

[0094] In some embodiments, the electrode terminals include a first electrode terminal and a second electrode terminal. The first electrode terminal includes a first terminal plate, at least a portion of which is disposed on the side of the first housing wall opposite to the receiving space. The first terminal plate includes a first main body portion and a first extension portion connected to each other. The second electrode terminal includes a second terminal plate, which is disposed on the side of the first housing wall opposite to the receiving space. The second terminal plate includes a second main body portion and a second extension portion connected to each other. Along the length direction of the first housing wall, the first extension portion and the second extension portion are located between the first main body portion and the second main body portion, and the first extension portion and the second extension portion are arranged along the width direction of the first housing wall.

[0095] The design of the terminal blocks can improve heat dissipation, support for the first housing wall, and connection strength with the busbar by making the terminal blocks larger. The shape design of each terminal block has a high degree of freedom.

[0096] In some embodiments, along the wall thickness direction of the first housing wall, the portion where the first electrode terminal and the second electrode terminal overlap is an overlapping region, the length of the overlapping region along the width direction of the first housing wall is W11, the length of the first housing wall along the width direction is W, and W11 is in the range of 10% to 90% of W.

[0097] Therefore, the first housing wall can be fully utilized along its width direction, and the support force between the first electrode terminal and the second electrode terminal can be reliably improved, the bending strength of the electrode terminal can be increased, and the strength of the first housing wall around the electrode terminal can be strengthened.

[0098] In some embodiments, W11 is in the range of 0.5 mm to 50 mm.

[0099] Therefore, the dimensions of the overlapping area along the width direction of the first housing wall can be determined based on the dimensions of the first housing wall along the width direction of the first housing wall. By setting the dimensions of the overlapping area along the width direction of the first housing wall to be larger, the supporting force between the first electrode terminal and the second electrode terminal can be improved, the bending strength of the electrode terminal can be improved, and the strength of the first housing wall around the electrode terminal can be strengthened.

[0100] In some embodiments, the length of the overlapping region along the length direction of the first housing wall is L11, and L11 is in the range of 0.5 mm to 6 mm.

[0101] Therefore, by setting the length of the overlapping area along the length direction of the first housing wall to be smaller, the fit strength between the protrusion and the recess can be improved, and the space utilization rate can be improved.

[0102] In some embodiments, the first extension is offset relative to the center position of the first main body portion along the width direction of the first housing wall; and / or, the second extension is offset relative to the center position of the second main body portion along the width direction of the first housing wall.

[0103] Therefore, the dimensions of the first housing wall along the width direction can be fully utilized to arrange the first extension and the second extension along the width direction of the first housing wall, which is beneficial for compactly configuring the first electrode terminal and the second electrode terminal.

[0104] In some embodiments, the length of the first housing wall is less than or equal to 450 mm.

[0105] This allows for full utilization of the narrower sidewalls of the elongated battery cells to configure electrode terminals, improving the flexibility of battery cell assembly and facilitating large-area heat dissipation.

[0106] A second aspect of this disclosure provides a battery comprising: a housing and at least two battery cells as described in the first aspect.

[0107] Because the battery uses the battery cells described above, the heat dissipation capacity of the electrode terminals in the battery cells is improved, thereby improving the battery's performance.

[0108] In some embodiments, the individual battery cells are arranged along the width direction of the first housing wall.

[0109] This helps to improve the volume utilization rate of the battery.

[0110] In some embodiments, the first electrode terminal includes a first electrode terminal including a first body portion and a first extension portion connected to each other, and the second electrode terminal includes a second body portion and a second extension portion connected to each other. Along the length direction of the first housing wall, at least a portion of the first extension portion and at least a portion of the second extension portion are located between the first body portion and the second body portion. In adjacent battery cells, the first extension portion of one battery cell and the second extension portion of another battery cell are arranged along the width direction and electrically connected by a busbar.

[0111] Since the busbar is connected to the first extension and the second extension located between the first main body and the second main body, the connection part has strong bending resistance. Therefore, the first electrode terminal, the second electrode terminal and the first housing wall are not prone to bending deformation or breakage, thereby improving the reliability of the battery.

[0112] In some embodiments, in the same battery cell, along the width direction of the first housing wall, the first extension and the second extension have a first overlapping portion, and in adjacent battery cells, the first overlapping portion of one battery cell and the first overlapping portion of another battery cell are electrically connected via the busbar.

[0113] Therefore, the busbar is connected to the portion that forms the first overlapping part between the first electrode terminal and the second electrode terminal. Since this portion has strong bending resistance, even if the busbar causes bending stress to act on the first electrode terminal, the second electrode terminal, and the first housing wall, the first electrode terminal, the second electrode terminal, and the first housing wall are not easily bent or deformed, and are less likely to break due to bending deformation, thereby improving the reliability of the battery.

[0114] In some embodiments, at least one wall of the housing has a boss, which is formed by the housing wall protruding in a direction away from the battery cell. The boss forms a receiving portion on the side facing the battery cell. Along the direction perpendicular to the housing wall on which the boss is formed, the projections of the first electrode terminal and the second electrode terminal do not exceed the projection of the boss, and the first electrode terminal and / or the second electrode terminal are at least partially received in the receiving portion.

[0115] Therefore, by simply increasing the height of the housing at the locations of the first electrode terminal, the second electrode terminal, and the busbar, the size of the battery can be suppressed, and the volume utilization rate of the battery can be improved.

[0116] A third aspect of this disclosure provides an electrical device comprising a plurality of battery cells provided in the first aspect or batteries provided in the second aspect, wherein the battery cells or batteries supply power to the electrical device.

[0117] Therefore, it is possible to provide electrical devices with battery cells or batteries that have strong heat dissipation capabilities at the electrode terminals, thereby improving the performance of the electrical devices.

[0118] A fourth aspect of this disclosure provides an energy storage device comprising a plurality of battery cells provided in the first aspect or batteries provided in the second aspect, wherein the battery cells or batteries are used to store electrical energy and are capable of providing electrical energy.

[0119] Therefore, it is possible to provide energy storage devices with battery cells or batteries that have strong heat dissipation capabilities at the electrode terminals, thereby improving the performance of energy storage devices. Attached Figure Description

[0120] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this disclosure;

[0121] Figure 2 is a schematic diagram of the structure of an energy storage device provided in an embodiment of this disclosure;

[0122] Figure 3 is a three-dimensional exploded view of a battery provided in an embodiment of this disclosure;

[0123] Figure 4 is a three-dimensional exploded view of a battery cell provided in an embodiment of this disclosure;

[0124] Figure 5 is a top view of a battery cell provided in an embodiment of this disclosure;

[0125] Figure 6 is a top view of a battery cell provided in another embodiment of this disclosure;

[0126] Figure 7 is a top view of a battery cell provided in another embodiment of the present disclosure;

[0127] Figure 8 is an exploded view of the electrode terminals provided in another embodiment of this disclosure;

[0128] Figure 9 is a schematic diagram of a group of multiple battery cells provided in an embodiment of this disclosure;

[0129] Figure 10 is a front view schematic diagram of a group of multiple battery cells provided in an embodiment of the present disclosure;

[0130] Figure 11 is a cross-sectional view AA in Figure 10 provided in an embodiment of this disclosure;

[0131] Figure 12 is a top view of a battery cell provided in yet another embodiment of this disclosure;

[0132] Figure 13 is a cross-sectional view along BB in Figure 12;

[0133] Figure 14 is a partially enlarged schematic diagram of part C in Figure 13;

[0134] Figure 15 is a schematic diagram of a group of multiple battery cells provided in another embodiment of the present disclosure;

[0135] Figure 16 is a three-dimensional exploded view of a battery cell provided in another embodiment of this disclosure;

[0136] Figure 17 is a cross-sectional schematic diagram of a battery with a boss provided in an embodiment of the present disclosure;

[0137] Figure 18 is a partially enlarged schematic diagram of part C1 in Figure 13;

[0138] Figure 19 is a cross-sectional view of DD in Figure 12;

[0139] Figure 20 is a partially enlarged schematic diagram of part D1 in Figure 19;

[0140] Figure 21 is a top view of a battery cell provided in yet another embodiment of this disclosure.

[0141] Explanation of reference numerals in the attached drawings: 1000 Vehicle; 2000 Energy storage device; 100 Battery; 200 Controller; 300 Motor; 400 Electrical compartment; 10 Battery cell; 20 Housing; 20A Upper housing; 20B Lower housing; 1 Outer shell; 11 First housing wall; 12 Receiving space; 131 First recess; 132 Second recess; 2 Busbar; 3 Electrode terminal; 31 First electrode terminal; 311 First terminal plate; 312 First connecting post; 314 First protrusion; 32 Second electrode terminal; 321 Second terminal plate; 322 Second connecting post; 325 Third connecting post; 315 First recess; 3151 First step; 3152 Second step; 316 Second recess. ; 3161 Third step portion; 3162 Fourth step portion; 317 Second protrusion portion; 4 Terminal plate; 41 First terminal plate; 42 Second terminal plate; 5 Main body portion; 51 First main body portion; 52 Second main body portion; 6 Extension portion; 61 First extension portion; 62 Second extension portion; 63 Third extension portion; 64 Fourth extension portion; 7 Electrode assembly: 71 First electrode tab; 72 Second electrode tab; 81 First insulating member; 82 Second insulating member; 811 First covering portion; 812 Second covering portion; 91 First overlapping portion; 93 Connection area; 111a Boss; 111b Receiving portion; X Length direction of the first housing wall; Y Width direction of the first housing wall; Z Thickness direction of the first housing wall. Detailed Implementation

[0142] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this disclosure can be combined with each other, and the detailed descriptions in the specific embodiments should be understood as explanations of the purpose of this disclosure and should not be regarded as undue limitations on this disclosure.

[0143] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0144] In the description of this disclosure, the technical terms "first," "second," "third," "fourth," etc., are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0145] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0146] In the description of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0147] In the description of the embodiments of this disclosure, the technical terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0148] In the description of this disclosure, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0149] In the description of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" shall be interpreted broadly and may refer to direct contact, contact through an intermediate medium, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0150] In the description of embodiments of this disclosure, unless otherwise expressly specified and limited, the technical terms "parallel" and "perpendicular" are subject to a certain degree of tolerance and / or error, including cases of being substantially parallel and substantially perpendicular.

[0151] The following is a detailed description of this disclosure.

[0152] In existing battery systems, batteries consist of electrode assemblies and electrode terminals. The electrode assemblies provide power through electrical connections between the tabs and the electrode terminals. Heat from the welding points between the tabs and the electrode terminals, as well as the welding points within the internal structure of the electrode terminals, is primarily transferred to the outside through the electrode terminals. As the demands for fast-charging technology for batteries increase, the requirements for heat dissipation at the electrode terminals also become more stringent. Improving the heat dissipation effect of the electrode terminals is one of the research topics in the industry.

[0153] In related technologies, there are solutions with dedicated cooling structures for the electrode terminals, but these have drawbacks such as large space requirements and complex structures. Therefore, there is a need to provide a battery cell that can improve the heat dissipation capacity of the electrode terminals without significantly altering the original battery's outer dimensions. Research has shown that the electrode terminals can be partially protruded, increasing their circumferential circumference and thus increasing the contact area between the electrode terminals and the air. This increases the heat dissipation area, improves the heat dissipation capacity of the electrode terminals, and ultimately enhances the performance of the battery cell.

[0154] Based on this design concept, the inventors of this disclosure have designed a battery cell, which includes: a housing having a receiving space, the housing including a first housing wall; an electrode assembly disposed in the receiving space; and an electrode terminal disposed in the first housing wall, the electrode terminal having a terminal plate for connecting to a busbar, the terminal plate including a main body and at least one extension connected to the main body, the at least one extension protruding from the main body along a direction perpendicular to the wall thickness of the first housing wall.

[0155] The extension portion protrudes from the main body along a direction perpendicular to the wall thickness of the first housing, which increases the contact area between the terminal plate and the air, thereby increasing the contact area between the electrode terminals and the air, thus increasing the heat dissipation area, improving the heat dissipation performance of the electrode terminals, and further improving the performance of the battery cell. The battery cell provided in this embodiment can be used, but is not limited to, in electrical devices such as energy storage devices, vehicles, ships, or aircraft.

[0156] The battery cells provided in this disclosure can also be grouped together to be used as batteries (sometimes also called battery packs). The batteries can also be used, but are not limited to, in electrical devices such as energy storage devices, vehicles, ships, or aircraft.

[0157] This disclosure also provides an electrical device including the aforementioned battery cell or battery. The electrical device can be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0158] This disclosure also provides an energy storage device including the above-mentioned battery cells or batteries, the energy storage device including energy storage containers, energy storage cabinets, etc.

[0159] For ease of explanation, an example of an electrical device according to an embodiment of this disclosure, namely a vehicle 1000, will be used for description. The description will now be provided in conjunction with the accompanying drawings.

[0160] Figure 1 is a schematic diagram of the structure of a vehicle provided in an embodiment of this disclosure. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. As shown in Figure 1, a battery 100 is disposed inside the vehicle 1000. The battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0161] In some embodiments of this disclosure, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0162] Figure 2 is a schematic diagram of the structure of an energy storage device 2000 provided in some embodiments of this disclosure. The energy storage device 2000 can be an energy storage container or an energy storage cabinet, etc. As shown in Figure 2, the energy storage device 2000 may include a battery 100 and a control unit 400. The control unit 400 is used to control the charging and discharging of the battery 100 to ensure that the battery 100 works normally, for example, to monitor parameters such as ambient temperature and humidity.

[0163] Figure 3 is an exploded view of the structure of a battery provided in an embodiment of the present disclosure. As shown in Figure 3, the battery 100 includes a housing 20, which can be divided into an upper housing 20A and a lower housing 20B. The upper housing 20A and the lower housing 20B are aligned with each other to form an arrangement space for the battery cells 10.

[0164] In battery 100, there can be multiple battery cells 10, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 10 is placed within the arrangement space defined by the upper housing 20A and the lower housing 20B. Alternatively, battery 100 can also be composed of multiple battery cells 10 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the arrangement space defined by the upper housing 20A and the lower housing 20B. Battery 100 may also include other structures; for example, it may include a busbar (not shown in Figure 3) for electrical connection between multiple battery cells 10.

[0165] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0166] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments disclosed herein are not limited to this.

[0167] The following describes some embodiments of the present disclosure in detail with reference to Figures 4 to 21.

[0168] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of the present disclosure; Figure 2 is a structural schematic diagram of an energy storage device provided in an embodiment of the present disclosure; Figure 3 is a three-dimensional exploded schematic diagram of a battery provided in an embodiment of the present disclosure; Figure 4 is a three-dimensional exploded schematic diagram of a battery cell provided in an embodiment of the present disclosure; Figure 5 is a top view schematic diagram of a battery cell provided in an embodiment of the present disclosure; Figure 6 is a top view schematic diagram of a battery cell provided in yet another embodiment of the present disclosure; Figure 7 is a top view schematic diagram of a battery cell provided in yet another embodiment of the present disclosure; Figure 8 is an exploded schematic diagram of electrode terminals provided in yet another embodiment of the present disclosure; Figure 9 is a structural schematic diagram of a group of multiple battery cells provided in an embodiment of the present disclosure; Figure 10 is a front view schematic diagram of a group of multiple battery cells provided in an embodiment of the present disclosure. Figure 11 is a cross-sectional view of AA in Figure 10 provided in one embodiment of the present disclosure; Figure 12 is a top view of a single battery cell provided in yet another embodiment of the present disclosure; Figure 13 is a cross-sectional view along BB in Figure 12; Figure 14 is a partially enlarged view of part C in Figure 13; Figure 15 is a structural schematic diagram of a group of multiple battery cells provided in yet another embodiment of the present disclosure; Figure 16 is a three-dimensional exploded view of a single battery cell provided in another embodiment of the present disclosure; Figure 17 is a cross-sectional view of a battery with a boss provided in one embodiment of the present disclosure; Figure 18 is a partially enlarged view of part C1 in Figure 13; Figure 19 is a cross-sectional view of DD in Figure 12; Figure 20 is a partially enlarged view of part D1 in Figure 19; Figure 21 is a top view of a single battery cell provided in yet another embodiment of the present disclosure.

[0169] In the description of the embodiments of this disclosure, for ease of explanation, the direction of arrow X represents the "length direction of the first housing wall" and the "length direction of the battery cell", the direction of arrow Y represents the "width direction of the first housing wall" and the "thickness direction of the battery cell", and the direction of arrow Z represents the "wall thickness direction of the first housing wall" and the "height direction of the battery cell".

[0170] A first aspect of this disclosure provides a battery cell 10. The battery cell 10 includes: a housing 1 having a receiving space 12, the housing 1 including a first housing wall 11; an electrode assembly 7, at least partially disposed in the receiving space 12; and an electrode terminal 3 disposed in the first housing wall 11, the electrode terminal 3 having a terminal plate 4 for connection to a busbar 2, the terminal plate 4 including a main body portion 5 and at least one extension portion 6 connected to the main body portion 5, the at least one extension portion 6 protruding from the main body portion 5 along a direction perpendicular to the thickness Z of the first housing wall.

[0171] As shown in Figure 4, the battery cell 10 includes a housing 1, which has multiple housing walls. For ease of description, one of the housing walls is referred to as the first housing wall 11. The battery cell 10 also includes an electrode assembly 7, which is located within a receiving space 12 enclosed by the multiple housing walls.

[0172] In some embodiments, as shown in FIG. 4, the battery cell 10 includes an electrode assembly 7. The electrode assembly 7 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is disposed between the positive and negative electrode to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through. In the embodiment shown in FIG. 4, two stacked wound bodies formed by layering and winding the positive electrode, negative electrode, and separator are shown as electrode assembly 7. However, the electrode assembly 7 is not limited to the wound type shown in FIG. 4; for example, it can also be a stacked type or other structural forms.

[0173] The electrode assembly 7 is provided with tabs, which can conduct current from the electrode assembly 7. The tabs include a positive tab and a negative tab. In the specific embodiment shown in FIG4, the electrode assembly 7 has a first tab 71 and a second tab 72. The first tab 71 and the second tab 72 are disposed on one side of the electrode assembly 7 along the wall thickness direction Z of the first housing wall and respectively disposed near both ends of the electrode assembly 7 along the length direction X of the first housing wall. Of course, the first tab 71 and the second tab 72 can also be disposed on both sides of the electrode assembly 7; the first tab 71 and the second tab 72 can also be disposed near one end of the electrode assembly 7 along the length direction X of the first housing wall.

[0174] In some embodiments, the battery cell 10 includes a housing 1. The housing 1 is used to encapsulate components such as the electrode assembly 7 and the electrolyte. The housing 1 can be a steel housing, an aluminum housing, a plastic housing (such as a polypropylene housing), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0175] In some embodiments, the outer casing can be a sealed structure or a non-sealed structure. As an example, when the outer casing is a non-sealed structure, it serves to protect the electrode assembly, and a sealing bag is included between the outer casing and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. In the embodiments shown in Figures 4 to 20, for ease of explanation, a prismatic battery cell is used as an example.

[0176] In some embodiments, as shown in FIG4, the housing 1 includes a plurality of housing walls, a portion of which encloses a space with an opening. The opening can be closed by another housing wall (e.g., the first housing wall 11) to form a receiving space 12 for accommodating the electrode assembly 7 and substances such as electrolytes. The housing 1 may have one or more openings. The housing wall that closes the opening (e.g., the first housing wall 11) may also be configured as a top cover.

[0177] As shown in Figures 4 to 7, the battery cell 10 also includes an electrode terminal 3, which is disposed on the first housing wall 11. The electrode terminal 3 is connected to the electrode assembly 7 to conduct current into or out of the electrode assembly 7. The electrode terminal 3 has a terminal plate 4, which is used to connect to the busbar 2. The busbar 2 can realize the electrical connection between battery cells. The terminal plate 4 includes a main body 5 and at least one extension 6. The main body 5 is connected to each extension 6. Along the Z direction perpendicular to the wall thickness of the first housing, at least one extension 6 protrudes from the main body 5.

[0178] In some embodiments, the electrode terminal 3 can be directly connected to the electrode tab, or it can be indirectly connected to the electrode tab through an adapter. For ease of explanation, in the embodiments of this disclosure, the housing wall where the electrode terminal 3 is located is referred to as the first housing wall 11.

[0179] Optionally, there can be one, two, three, or four electrode terminals 3. When there is only one electrode terminal 3, it can be the positive terminal and the outer casing 1 can be the negative terminal. The electrode terminal 3 can be located at the center of the first casing wall 11, or at one end of the first casing wall 11 along the length direction X, or at one end of the first casing wall 11 along the width direction Y. There are no special restrictions on the specific location of the electrode terminal 3 on the first casing wall 11, as long as electrical connection between the electrode terminal 3 and the tab can be achieved. In a specific embodiment, as shown in FIG5, the electrode terminal 3 is located at one end of the first casing wall 11 along the length direction X.

[0180] As shown in Figure 9, the connection between the terminal block 4 and the busbar 2 is an electrical connection. Optionally, the terminal block 4 can be directly connected to the busbar 2 or indirectly connected to the busbar 2; the main body 5 of the terminal block 4 can be connected to the busbar 2, the extension 6 of the terminal block 4 can be connected to the busbar 2, or both the main body 5 and the extension 6 of the terminal block 4 can be connected to the busbar 2.

[0181] As shown in Figures 5 to 7, in some embodiments, a busbar 2 can be arranged on the surface of the terminal block 4, and the shaded area in Figures 5 to 7 represents the welding area of ​​the busbar. Firstly, the busbar connects the battery cells 10; secondly, it distributes current; and thirdly, it detects and conducts temperature. By designing a reasonable heat dissipation scheme, the busbar can enhance the heat dissipation capacity of the battery cells 10, thereby reducing the temperature of the battery cells 10 and improving their performance.

[0182] Optionally, the main body 5 and the extension 6 can be an integral structure or a separate structure; when the main body 5 and the extension 6 are separate structures, the main body 5 and the extension 6 can be directly connected or indirectly connected, wherein the materials of the main body 5 and the extension 6 can be the same or different.

[0183] As shown in Figure 4, when the outer surface of the first housing wall 11 is a planar structure, the plane formed by the length direction X and the width direction Y of the first housing wall is parallel to the outer surface of the first housing wall 11. Sometimes the width direction Y of the first housing wall is also taken as the thickness direction of the battery cell 10. Of course, the outer surface of the first housing wall 11 can also be a curved surface.

[0184] Optionally, there can be one or more extensions 6. Taking the orientation shown in Figure 5 as an example, the extension 6 can protrude from the main body 5 along one or the other side of the length direction X of the first housing wall relative to the main body 5; the extension 6 can also protrude from the main body 5 along one or the other side of the width direction Y of the first housing wall relative to the main body 5; when there are multiple extensions 6, some extensions 6 can protrude from the main body 5 along one or the other side of the length direction X of the first housing wall relative to the main body 5, while other extensions 6 can protrude from the main body 5 along one or the other side of the width direction Y of the first housing wall. Of course, the extension 6 can also extend relative to the main body 5 in other directions. For example, the extension 6 can protrude from the main body 5 in the middle direction between the length direction X and the width direction Y of the first housing wall (as shown in the upper left direction in Figure 5). There are no specific limitations on the number, shape, and size of the extensions 6 and the main body 5. The extension directions of multiple extensions 6 can be the same or different.

[0185] Optionally, the extension 6 can be cylindrical, cuboid, polygonal prism, or other regular or irregular shapes; the main body 5 can also be cylindrical, cuboid, polygonal prism, or other regular or irregular shapes. The extension 6 and the main body 5 can have the same or different shapes. In one specific embodiment, the extension 6 and the main body 5 are cuboids of different sizes.

[0186] The extension 6 protrudes from the main body 5 along a direction perpendicular to the wall thickness of the first housing, which can increase the contact area between the terminal plate 4 and the air, thereby increasing the contact area between the electrode terminal 3 and the air, thus increasing the heat dissipation area, improving the heat dissipation performance of the electrode terminal 3, and further improving the performance of the battery cell 10.

[0187] In some embodiments, along the length direction X of the first housing wall, the extension 6 protrudes from the main body 5, and the length of the extension 6 is greater than the length of the main body 5.

[0188] As shown in Figures 5 to 7, an extension 6 protrudes from the main body 5 along the length direction X of the first housing wall, and the length of the extension 6 along the length direction X of the first housing wall is greater than the length of the main body 5 along the length direction X of the first housing wall.

[0189] Optionally, the extension 6 may protrude from one side of the main body 5 along the length direction X of the first housing wall (as shown on the left side of the main body 5 in Figure 5), or the extension 6 may protrude from the other side of the main body 5 along the length direction X of the first housing wall (as shown on the right side of the main body 5 in Figure 5).

[0190] The length of the extension 6 along the length direction X of the first housing wall is greater than the length of the main body 5 along the length direction X of the first housing wall. The specific dimensions of the extension 6 are not limited here, as long as they can be processed and achieve heat dissipation.

[0191] This increases the length of the extension 6 along the length direction X of the first housing wall, increases the circumference of the terminal plate 4, and increases the contact area between the terminal plate 4 and the air, thereby increasing the heat dissipation area, improving the heat dissipation capacity of the electrode terminal 3, and thus improving the performance of the battery cell 10.

[0192] In some embodiments, the battery cell 10 includes at least two electrode terminals, including a first electrode terminal 31 and a second electrode terminal 32. The first electrode terminal 31 includes a first body portion 51 and a first extension portion 61, and the second electrode terminal 32 includes a second body portion 52 and a second extension portion 62. The first extension portion 61 and the second extension portion 62 extend along the length direction X of the first housing wall toward a side that is close to each other; or, the first extension portion 61 and the second extension portion 62 extend along the length direction X of the first housing wall toward the same side.

[0193] As shown in Figures 5 to 7, the battery cell 10 includes a first electrode terminal 31 and a second electrode terminal 32. The first electrode terminal 31 includes a first main body portion 51 and a first extension portion 61, and the second electrode terminal 32 includes a second main body portion 52 and a second extension portion 62. In some specific embodiments, the first electrode terminal 31 has a first terminal plate 41, which includes a first main body portion 51 and a first extension portion 61. In other specific embodiments, the second electrode terminal 32 has a second terminal plate 42, which includes a second main body portion 52 and a second extension portion 62.

[0194] Optionally, the first extension 61 and the second extension 62 may each protrude from their respective main body 5 along the length direction X of the first housing wall and extend toward the side that is closer to each other (the extension directions are opposite). Optionally, the first extension 61 and the second extension 62 may also each protrude from their respective main body 5 along the length direction X of the first housing wall and extend toward the same side.

[0195] In some embodiments, the first electrode terminal 31 and the second electrode terminal 32 may be located at either end or the middle of the first housing wall 11 along the length direction X of the first housing wall; the first electrode terminal 31 and the second electrode terminal 32 may both be located at one end of the first housing wall 11 along the length direction X of the first housing wall; alternatively, one electrode terminal 3 may be located at the middle of the first housing wall 11 along the length direction X of the first housing wall, and the other electrode terminal 3 may be located at the end of the first housing wall 11 along the length direction X of the first housing wall; the first electrode terminal 31 and the second electrode terminal 32 may also be arranged irregularly. The above embodiments are merely illustrative examples of the positions of the first electrode terminal 31 and the second electrode terminal 32 and have no limiting effect on this disclosure. Of course, the first electrode terminal 31 and the second electrode terminal 32 may also be located at other positions of the first housing wall 11. In the embodiment shown in FIG. 16, the first electrode terminal 31 and the second electrode terminal 32 are both located approximately at the middle position of the first housing wall 11 along the length direction X of the first housing wall.

[0196] The shapes of the first electrode terminal 31 and the second electrode terminal 32 may be the same or different. The first electrode terminal 31 may have one, two, three or four extensions; the second electrode terminal 32 may have one, two, three or four extensions, and the number of extensions 6 of the first electrode terminal 31 and the second electrode terminal 32 may be the same or different.

[0197] In one specific embodiment, as shown in FIG7, the first electrode terminal 31 and the second electrode terminal 32 have the same shape. Each of the first electrode terminal 31 and the second electrode terminal 32 has an extension extending along the length direction X of the first housing wall. The first electrode terminal 31 and the second electrode terminal 32 are arranged opposite each other along the length direction X of the first housing wall. Alternatively, the first electrode terminal 31 and the second electrode terminal 32 can also be arranged facing the same side along the length direction X of the first housing wall (left or right side in FIG7). In another specific embodiment, as shown in FIG6, the first electrode terminal 31 and the second electrode terminal 32 have the same shape. Each of the first electrode terminal 31 and the second electrode terminal 32 has two extensions extending along the length direction X of the first housing wall. The first electrode terminal 31 and the second electrode terminal 32 are arranged opposite each other along the length direction X of the first housing wall. Alternatively, the first electrode terminal 31 and the second electrode terminal 32 can also be arranged facing the same side along the length direction X of the first housing wall (left or right side in FIG6).

[0198] In another specific embodiment, as shown in FIG5, the first electrode terminal 31 and the second electrode terminal 32 have different shapes. The first electrode terminal 31 has one extension, and the second electrode terminal 32 has two extensions. The first electrode terminal 31 and the second electrode terminal 32 are arranged opposite to each other along the length direction X of the first housing wall. Of course, the first electrode terminal 31 and the second electrode terminal 32 can also be arranged facing the same side along the length direction X of the first housing wall. The above embodiments are merely illustrative examples of the shapes of the first electrode terminal 31 and the second electrode terminal 32 and their placement on the first housing wall 11, and have no limiting effect on this disclosure.

[0199] The electrode terminals 3 are configured with at least two, which increases the contact area between the electrode terminals 3 and the air, improves the heat dissipation capacity of the electrode terminals 3, and thus improves the performance of the battery cell 10. The first extension and the second extension can extend in multiple directions, improving the flexibility of their arrangement.

[0200] In some embodiments, the first extension 61 and the second extension 62 extend toward each other along the length direction X of the first housing wall; or, the first extension 61 and the second extension 62 extend toward the same side along the length direction X of the first housing wall.

[0201] As shown in Figures 5 to 7, the first extension 61 and the second extension 62 extend along the length direction X of the first housing wall towards each other. Taking the orientation shown in Figure 5 as an example, the first electrode terminal 31 and the second electrode terminal 32 are arranged close to each other along the length direction X of the first housing wall. The first extension 61 protrudes towards the second body portion 52 (to the right of the first body portion 51 in Figure 5) along the length direction X of the first housing wall relative to the first body portion 51, and the second extension 62 protrudes towards the first body portion 51 (to the left of the second body portion 52 in Figure 5) along the length direction X of the first housing wall relative to the second body portion 52. Of course, the first electrode terminal 31 and the second electrode terminal 32 can also be arranged along one side or the other side of the length direction X and width direction Y of the first housing wall, which will not be elaborated here.

[0202] In other embodiments, the first extension 61 and the second extension 62 extend in the same direction along the length direction X of the first housing wall. Taking the orientation shown in FIG5 as an example, the first electrode terminal 31 and the second electrode terminal 32 are arranged along the length direction X of the first housing wall with the first extension 61 and the second extension 62 facing the same direction. The first extension 61 protrudes away from the second extension 62 along the length direction X of the first housing wall relative to the first main body 51 (to the left of the first main body 51 in FIG5), and the second extension 62 protrudes towards the first main body 51 along the length direction X of the first housing wall relative to the second main body 52 (to the left of the second main body 52 in FIG5). Alternatively, the first extension 61 may protrude towards the second extension 62 along the length direction X of the first housing wall relative to the first main body 51 (to the right of the first main body 51 in FIG5), and the second extension 62 may protrude away from the first main body 51 along the length direction X of the first housing wall relative to the second main body 52 (to the right of the second main body 52 in FIG5).

[0203] The first extension 61 and the second extension 62 can extend in multiple directions, which improves the flexibility of the arrangement of the first extension 61 and the second extension 62.

[0204] In some embodiments, the terminal block further includes a plurality of extensions.

[0205] The extension can be one, two, or more. As shown in FIG6, the first terminal plate 41 includes a first extension 61 and a third extension 63 extending from the first main body 51. The third extension 63 can extend relative to the first main body 51 along one side of the length direction X of the first housing wall and one side of the width direction Y of the first housing wall. The extension directions of the third extension 63 and the first extension 61 can be the same or different. The third extension 63 can be a cylinder, a cuboid, a polygonal prism, or other regular or irregular shape. The shapes of the first extension 61 and the third extension 63 can be the same or different. In a specific embodiment, the first extension 61 and the third extension 63 are cuboids, and the extension directions of both the first extension 61 and the third extension 63 are along the length direction X of the first housing wall.

[0206] As shown in Figure 6, the second terminal plate 42 includes a second extension 62 and a fourth extension 64 extending from the second main body 52. ​​The fourth extension 64 can extend relative to the second main body 52 along one side of the length direction X of the first housing wall and one side of the width direction Y of the first housing wall. The extension directions of the fourth extension 64 and the second extension 62 can be the same or different. The fourth extension 64 can be a cylinder, a cuboid, a polygonal prism, or other regular or irregular shape. The shapes of the fourth extension 64 and the second extension 62 can be the same or different. In a specific embodiment, the second extension 62 and the fourth extension 64 are cuboids, and the extension directions of both the second extension 62 and the fourth extension 64 are along the length direction X of the first housing wall.

[0207] A terminal plate 4 is provided with at least two extensions 6, which can increase the heat dissipation area of ​​the terminal plate 4, improve the heat dissipation capacity of the electrode terminals 3, and thus improve the performance of the battery cell 10.

[0208] In some embodiments, a plurality of extensions extend from the same side of the main body 5 along the length direction X of the first housing wall.

[0209] Multiple extensions extend along the length direction X of the first housing wall towards the same side, or towards opposite sides. As shown in Figures 5 to 7, the third extension 63 and the first extension 61 extend along the length direction X of the first housing wall towards the same side or opposite sides. Taking the orientation shown in Figure 6 as an example, the third extension 63 and the first extension 61 extend along the length direction X of the first housing wall towards the same side. The third extension 63 and the first extension 61 can extend to one side (the left side of the first main body 51 in Figure 6) relative to the first main body 51 along the length direction X of the first housing wall, or the third extension 63 and the first extension 61 can extend to the other side (the right side of the first main body 51 in Figure 6) relative to the first main body 51 along the length direction X of the first housing wall. The third extension 63 and the first extension 61 can extend to opposite sides along the length direction X of the first housing wall. That is, one of the third extension 63 and the first extension 61 extends to one side (the left side of the first main body 51 in Figure 6) relative to the first main body 51 along the length direction X of the first housing wall, and the other extends to the other side (the right side of the first main body 51 in Figure 6) relative to the first main body 51 along the length direction X of the first housing wall. In a specific embodiment, the third extension 63 and the first extension 61 extend to the same side along the length direction X of the first housing wall.

[0210] As shown in Figures 5 to 7, the fourth extension 64 and the second extension 62 extend along the length direction X of the first housing wall towards the same or opposite sides. Taking the orientation shown in Figure 6 as an example, the fourth extension 64 and the second extension 62 extend along the length direction X of the first housing wall towards the same side. The fourth extension 64 and the second extension 62 can extend to one side (left side of the second main body 52 in Figure 6) relative to the second main body 52 along the length direction X of the first housing wall, and the fourth extension 64 and the second extension 62 can extend to the other side (right side of the second main body 52 in Figure 6) relative to the second main body 52 along the length direction X of the first housing wall. The fourth extension 64 and the second extension 62 can also extend to the opposite side along the length direction X of the first housing wall, that is, one of the fourth extension 64 and the second extension 62 extends to one side (left side of the second main body 52 in Figure 6) relative to the second main body 52 along the length direction X of the first housing wall, and the other extends to the other side (right side of the second main body 52 in Figure 6) relative to the second main body 52 along the length direction X of the first housing wall. In one specific embodiment, the fourth extension 64 and the second extension 62 extend to the same side along the length direction X of the first housing wall.

[0211] Of course, a terminal block 4 may also have three, four or five extensions 6, wherein the extension directions of the extensions 6 may be the same or different.

[0212] When a terminal block 4 can be provided with at least two extensions 6, the extension directions of the extensions 6 can be the same or opposite, which improves the flexibility of the arrangement of the extensions 6.

[0213] In some embodiments, the ratio of the length of the extension 6 to the length of the main body 5 along the width direction Y of the first housing wall is in the range of 0.4 to 0.8.

[0214] As shown in Figures 5 to 7, along the width direction Y of the first housing wall, the ratio of the length of the extension 6 to the length of the main body 5 is in the range of 0.4 to 0.8, that is, 0.4≤Y1 / Y2≤0.8, where Y1 is the length of the extension 6 along the width direction Y of the first housing wall, and Y2 is the length of the main body 5 along the width direction Y of the first housing wall.

[0215] Optionally, Y1 / Y2 = 0.4, Y1 / Y2 = 0.45, Y1 / Y2 = 0.5, Y1 / Y2 = 0.6, Y1 / Y2 = 0.65, Y1 / Y2 = 0.7, Y1 / Y2 = 0.8, or other ratios within the above range. The smaller the value, the more extensions 6 can be provided on the main body 5, which helps improve the heat dissipation capacity of the electrode terminals 3 while reducing the weight of the battery cell 10. Of course, other ranges within the above range are also possible. For example, Y1 / Y2 can also be 0.3. Among the multiple extensions, the values ​​of Y1 / Y2 for each extension can be the same or different.

[0216] Therefore, a main body 5 can be provided with multiple extensions 6, increasing the number of extensions 6. Under the same heat dissipation effect, the volume of the extensions 6 can be reduced, the weight of the battery cell 10 can be decreased, and production costs can be lowered. By keeping the ratio of the length of the extension to the length of the main body within the range of 0.4 to 0.8 along the width direction Y of the first housing wall, both the number of extensions and the size of each individual extension are considered, thereby improving heat dissipation performance.

[0217] In some embodiments, the first electrode terminal 31 includes a first terminal plate 41, and the second electrode terminal 32 includes a second terminal plate 42. Along the width direction Y of the first housing wall, the ratio of the length of the first terminal plate 41 and the second terminal plate 42 to the length of the first housing wall 11 is in the range of 0.6 to 0.9. When the outer contours of the first terminal plate 41 and the second terminal plate 42 have different lengths along the length direction of the first housing wall, the maximum length is used as the length of the first terminal plate and the length of the second terminal plate.

[0218] As shown in Figure 5, along the width direction Y of the first housing wall, the ratio of the length of the first terminal plate 41 to the length of the first housing wall 11 is in the range of 0.6 to 0.9, i.e., 0.6 ≤ B11 / W ≤ 0.9, where B11 is the length of the first terminal plate 41 along the width direction Y of the first housing wall, and W is the length of the first housing wall 11 along the width direction Y of the first housing wall. Sometimes, the width direction Y of the first housing wall is also referred to as the thickness direction of the battery cell 10.

[0219] Optionally, B11 / W can be 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, or 0.9, or other ratios within the above range. A larger value is better, as this increases the dimension of the first terminal plate 41 along the width direction Y of the first housing wall, allowing for more extensions 6 extending along the length direction X of the first housing wall, thereby improving the heat dissipation capacity of the electrode terminal 3. Of course, other ranges within the above range are also possible. For example, B11 / W can also be 0.5.

[0220] As shown in Figure 5, along the width direction Y of the first housing wall, the ratio of the length of the second terminal plate 42 to the length of the first housing wall 11 is in the range of 0.6 to 0.9. That is, 0.6 ≤ B12 / W ≤ 0.9, where B12 is the length of the second terminal plate 42 along the width direction Y of the first housing wall, and W is the length of the first housing wall 11 along the width direction Y of the first housing wall. The width direction Y of the first housing wall refers to the width direction of the first housing wall 11. Sometimes, the width direction Y of the first housing wall is also referred to as the thickness direction of the battery cell 10.

[0221] Optionally, B12 / W can be 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, or 0.9, or other ratios within the above range. A larger value is better, as this increases the dimension of the second terminal plate 42 along the width direction Y of the first housing wall, allowing for more extensions 6 extending along the length direction X of the first housing wall, thereby improving the heat dissipation capacity of the electrode terminal 3. Of course, other ranges within the above range are also possible. For example, B12 / W can also be 0.5. The values ​​of B11 / W and B12 / W can be the same or different.

[0222] The size of the terminal plate 4 in the width direction Y along the first housing wall can be increased, thereby providing multiple extensions 6 on the terminal plate 4, thereby improving the heat dissipation capacity of the electrode terminal 3.

[0223] In some embodiments, the terminal board includes a first terminal board and a second terminal board, the first terminal board includes a first extension, the second terminal board includes a second extension, and along the length direction X of the first housing wall, the ratio of the length X1 of the first extension 61 to the length X3 of the first terminal board 41 is greater than or equal to 0.5 and less than 1; and / or, along the length direction X of the first housing wall, in the second terminal board 42, the ratio of the length X2 of the second extension 62 to the length X4 of the second terminal board 42 is greater than or equal to 0.5 and less than 1.

[0224] As shown in Figure 5, along the length direction X of the first housing wall, the ratio of the length X1 of the first extension 61 to the length X3 of the first terminal plate 41 ranges from 0.5 to 1, i.e., 0.5 ≤ X1 / X3 ≤ 1. Optionally, X1 / X3 = 0.5, X1 / X3 = 0.6, X1 / X3 = 0.7, X1 / X3 = 0.8, X1 / X3 = 0.9, or X1 / X3 = 1, or other ratios within the above range. Of course, other ranges are also possible, for example, X1 / X3 could also be 0.4.

[0225] As shown in Figures 5 to 7, along the length direction X of the first housing wall, the ratio of the length X2 of the second extension 62 to the length X4 of the second terminal plate 42 ranges from 0.5 ≤ X2 / X4 ≤ 1. Optionally, X2 / X4 = 0.5, X2 / X4 = 0.6, X2 / X4 = 0.7, X2 / X4 = 0.8, X2 / X4 = 0.9, or X2 / X4 = 1, or other ratios within the above range. Of course, other ranges are also possible, for example, X2 / X4 could also be 0.4. The values ​​of X1 / X3 and X2 / X4 can be the same or different.

[0226] Along the length direction X of the first housing wall, the size of the first extension 61 relative to the first terminal plate 41 is increased, and / or the size of the second extension 62 relative to the second terminal plate 42 is increased. This increases the size of the extension 6, increases the heat dissipation area of ​​the extension 6, and can effectively improve the heat dissipation performance of the electrode terminal 3.

[0227] In some embodiments, the terminal block includes a first terminal block and a second terminal block, wherein the ratio of the length X3 of the first terminal block 41 along the length direction X of the first housing wall to the length L of the first housing wall 11 along the length direction X of the first housing wall is in the range of 0.2 to 0.7; and / or, the ratio of the length X4 of the second terminal block 42 along the length direction X of the first housing wall to the length L of the first housing wall 11 along the length direction X of the first housing wall is in the range of 0.2 to 0.7.

[0228] As shown in Figure 5, along the length direction X of the first housing wall, the ratio of the length X3 of the first terminal plate 41 to the length L of the first housing wall 11 is in the range of 0.2 to 0.7, i.e., 0.2 ≤ X3 / L ≤ 0.7. Optionally, X3 / L = 0.2, X3 / L = 0.3, X3 / L = 0.4, X3 / L = 0.5, X3 / L = 0.6, or X3 / L = 0.7, or other ratios within the above range. Of course, other ranges are also possible, for example, X3 / L can also be 0.8.

[0229] As shown in Figures 5 to 7, along the length direction X of the first housing wall, the ratio of the length X4 of the second terminal plate 42 to the length L of the first housing wall 11 is in the range of 0.2 to 0.7, i.e., 0.2 ≤ X4 / L ≤ 0.7. Optionally, X4 / L = 0.2, X4 / L = 0.3, X4 / L = 0.4, X4 / L = 0.5, X4 / L = 0.6, or X4 / L = 0.7, or other ratios within the above range. Of course, other ranges are also possible, for example, X4 / L can also be 0.8. The values ​​of X3 / L and X4 / L can be the same or different, but the first terminal plate 41 and the second terminal plate 42 should not be located outside the first housing wall 11.

[0230] Along the length direction X of the first housing wall, the size of the terminal plate 4 is increased, thereby increasing the heat dissipation area of ​​the terminal plate 4 and effectively improving the heat dissipation performance of the electrode terminal 3.

[0231] In some embodiments, the terminal block includes a first terminal block and a second terminal block, wherein the ratio of the length X3 of the first terminal block 41 along the length direction X of the first housing wall to the length B11 of the first terminal block 41 along the width direction Y of the first housing wall is in the range of 3.5 to 10; and / or, the ratio of the length X4 of the second terminal block 42 along the length direction X of the first housing wall to the length B12 of the second terminal block 42 along the width direction Y of the first housing wall is in the range of 3.5 to 10. When the outer contours of the first terminal block 41 and the second terminal block 42 along the length direction of the first housing wall have different lengths, the maximum length is taken as the length of the first terminal block and the length of the second terminal block.

[0232] As shown in Figures 5 to 7, the terminal block includes a first terminal block and a second terminal block. In the first terminal block 41, the ratio of its length X3 along the length direction X of the first housing wall to its length B11 along the width direction Y of the first housing wall is in the range of 3.5 to 10, that is, 3.5≤X3 / B11≤10.

[0233] Optionally, X3 / B11 = 3.5, X3 / B11 = 4, X3 / B11 = 5, X3 / B11 = 6, X3 / B11 = 7, X3 / B11 = 8, X3 / B11 = 9, or X3 / B11 = 10, or other ratios within the above ranges. Of course, it can also be other ranges within the above ranges, such as X3 / B11 = 3.

[0234] As shown in Figures 5 to 7, in the second terminal plate 42, the ratio of its length X4 along the length direction X of the first housing wall to its length B12 along the width direction Y of the first housing wall is in the range of 3.5 to 10, that is, 3.5≤X4 / B12≤10.

[0235] Optionally, X4 / B12 can be 3.5, 4, 5, 6, 7, 8, 9, or 10, or other ratios within the above range. It can also be other ranges within the above range, such as X4 / B12 = 3. The ratios X3 / B11 and X4 / B12 can be the same or different.

[0236] The terminal plate 4 is designed to be elongated, which helps to increase the heat dissipation area of ​​the terminal plate 4 and further improve the heat dissipation performance of the electrode terminal 3.

[0237] In some embodiments, as shown in FIG8, the first electrode terminal 31 includes a first terminal plate 41, at least a portion of which is disposed on the side of the first housing wall 11 opposite to the receiving space 12, and the second electrode terminal 32 includes a second terminal plate 42, which is disposed on the side of the first housing wall 11 opposite to the receiving space.

[0238] The first terminal plate 41 and the second terminal plate 42 are located on the outside of the outer shell 1 of the battery cell and can be used to connect with the busbar, etc. The terminal plate can be made of metal, such as copper or aluminum.

[0239] Optionally, the first terminal plate 41 and the second terminal plate 42 are each configured as generally flat plates. The shape of the flat plates can be designed according to the situation, for example, they can be rectangular, circular, etc.

[0240] Optionally, the first terminal plate 41 and the second terminal plate 42 can be fixed to the first housing wall 11 by means of connecting posts or the like.

[0241] Therefore, it can be connected to busbars and other components, enabling electrical connection with external structures.

[0242] In some embodiments, the first electrode terminal 31 includes a first terminal disk 311, which is at least partially disposed on the side of the first housing wall 11 facing the receiving space 12. The second electrode terminal 32 includes a second terminal disk 321, which is at least partially disposed on the side of the first housing wall 11 facing the receiving space. Along the wall thickness direction of the first housing wall, the first terminal disk is at least partially disposed between the second terminal disk and the first housing wall; or, along the wall thickness direction of the first housing wall, the second terminal disk is at least partially disposed between the first terminal disk and the first housing wall.

[0243] The first terminal plate 311 and the second terminal plate 321 are located inside the outer casing 1 of the battery cell and can be used for electrical connection with the tabs. The terminal plates can be made of metal, such as copper or aluminum.

[0244] Optionally, the first terminal block 311 and the second terminal block 321 are each configured as generally flat plates. The shape of the flat plate can be designed according to the situation, for example, it can be rectangular, circular, or L-shaped as shown in Figure 8.

[0245] Optionally, the first terminal block 311 and the second terminal block 321 can be fixed to the first housing wall 11 by means of connecting posts or the like.

[0246] Since the electrode terminal 3 includes a terminal plate located outside the outer casing 1 of the battery cell 10 and a terminal disk located inside the casing, the electrode terminal 3 can be easily connected to the tabs of the electrode assembly 7 via the terminal disk. Furthermore, by designing the terminal plate to be larger, heat dissipation, support for the first casing wall 11, and connection strength with the busbar 2 can be improved. The shape design of both the terminal plate and the terminal disk offers a high degree of freedom. Moreover, the terminal plate and terminal disk clamp the first casing wall 11 from both the inner and outer sides of the outer casing 1, respectively, which improves the bending strength of the first casing wall 11.

[0247] In some embodiments, the first electrode terminal 31 further includes a first terminal disk 311, at least a portion of which is disposed on the side of the first housing wall 11 facing the receiving space 12. The second electrode terminal 32 further includes a second terminal disk 321, at least a portion of which is disposed on the side of the first housing wall 11 facing the receiving space 12. The first main body 51 and the first terminal disk 311 are directly connected by a first connecting post 312. The second main body 52 and the second terminal disk 321 are directly connected by a second connecting post 322.

[0248] As shown in Figure 8, the first terminal plate 41 and the first terminal disk 311 are connected by a first connecting post 312, which is used to connect the first main body 51 of the first terminal plate 41. There are no restrictions on the shape, size, or number of the first connecting posts 312, as long as they enable the connection between the first terminal plate 41 and the first terminal disk 311. In one specific embodiment, the first connecting post 312 is elliptical.

[0249] The first connecting post 312 can be connected to the first main body 51 or the first terminal plate 311 in the first terminal plate 41 by means of threaded connection, welding, riveting, etc., or it can be integrally formed with the first main body 51 or the first terminal plate 311 in the first terminal plate 41. The second connecting post 322 can be connected to the first connecting post 312 in a similar way. Therefore, the first connecting post 312 will be described in detail here, while the detailed description of the second connecting post 322 will be omitted.

[0250] In some embodiments, as shown in FIG8, the first connecting post 312 is integrally formed with the first terminal plate 311 and extends perpendicularly to the surface of the first terminal plate 311. A through hole is formed in the first main body portion 51 of the first terminal plate 41, and the first connecting post 312 is inserted into the through hole and fixedly connected to the first main body portion 51. Thus, the first electrode terminal 31 can be assembled to the first housing wall 11. In addition, a terminal seal can be further assembled between the first connecting post 312 and the first main body portion 51.

[0251] Since the terminal plate 4 and the terminal disk can be connected together via connecting posts, it can function as an electrode terminal 3 to draw current from the electrode assembly 7. Moreover, since the connecting posts are provided on the main body 5, the electrode terminal 3 can be reliably fixed to the first housing wall 11 on the main body 5.

[0252] In some embodiments, as shown in Figures 4, 5, 7 and 8, the electrode assembly includes a first electrode and a second electrode with opposite polarities, a first electrode terminal 31 electrically connected to the first electrode of the electrode assembly, and a second electrode terminal 32 electrically connected to the second electrode of the electrode assembly.

[0253] The first and second electrodes are led out through tabs and directly or indirectly connected to the electrode terminals. As shown in Figure 3, the tabs include a first tab 71 and a second tab 72.

[0254] One of the first electrode tab 71 and the second electrode tab 72 can be a positive electrode tab and the other a negative electrode tab. One of the first electrode terminal 31 and the second electrode terminal 32 can be connected to the positive electrode tab and the other to the negative electrode tab; both the first electrode terminal 31 and the second electrode terminal 32 can be connected to the first electrode tab 71, thus having the same polarity as the first electrode tab 71; both the first electrode terminal 31 and the second electrode terminal 32 can also be connected to the second electrode tab 72, thus having the same polarity as the second electrode tab 72.

[0255] Optionally, the first electrode terminal 31 and the second electrode terminal 32 can be directly connected to the first electrode tab 71, or they can be connected to the first electrode tab 71 via an adapter. Optionally, the first electrode terminal 31 and the second electrode terminal 32 can be directly connected to the second electrode tab 72, or they can be connected to the second electrode tab 72 via an adapter.

[0256] Therefore, the polarities of the first electrode terminal 31 and the second electrode terminal 32 can be the same or different depending on the situation, so that the electrode terminals 3 can be flexibly arranged on the casing of the battery cell 10 as needed.

[0257] In some embodiments, as shown in Figures 12 to 14, along the wall thickness direction of the first housing wall 11, the second terminal plate 42 is at least partially disposed between the first terminal plate 41 and the first housing wall 11, and the first terminal plate 41 abuts against the second terminal plate 42.

[0258] Therefore, by setting the first terminal plate 311 and the second terminal plate 321 to be interlocked, the bending strength of the electrode terminal 3 and the first housing wall 11 can be further improved; moreover, the first terminal plate 311 and the second terminal plate 321 can be electrically connected to each other, which facilitates the simplification of the connection structure when the two electrode terminals 3 have the same polarity.

[0259] In some embodiments, as shown in Figures 14 and 18, the first terminal plate 41 has a first protrusion 314 and the second terminal plate 42 has a first recess 315. The first protrusion 314 and the first recess 315 at least partially overlap along the wall thickness direction Z of the first housing wall, and the first protrusion 314 and the first recess 315 cooperate with each other.

[0260] The first protrusion 314 refers to a portion of the structure that extends from the first terminal plate 41 and enters the outer contour of the second terminal plate 42. The first recess 315 refers to a recess formed relative to the surface of the second terminal plate 42 that can accommodate the first protrusion 314. The recess can be formed by a groove or by a step. When the recess is formed by a step, it can include a single step, or it can include a second step or more steps.

[0261] Here, the first protrusion 314 and the first recess 315, in their mating state, can at least mutually restrict displacement along the thickness direction Z of the first housing wall. Optionally, the first protrusion 314 and the first recess 315, in their mating state, can also restrict displacement along the length direction X and / or the width direction Y of the first housing wall.

[0262] In some embodiments, the battery cell 10 includes a first insulating member 81, which is fixed to a first electrode terminal 31, and a second electrode terminal 32 is at least partially disposed between the first insulating member 81 and the first housing wall 11, with the first insulating member 81 abutting against the second electrode terminal 32.

[0263] The first electrode terminal 31 and the first insulating member 81 are fixed to each other. The fixing method can be integral injection molding, bonding, or fastening the two together through connecting columns, etc.

[0264] In the specific embodiments shown in Figures 8, 14 and 18, the surface of the second electrode terminal 32 located between the first insulating member 81 and the first housing wall 11, on the side away from the first housing wall 11 along the wall thickness direction Z, abuts against the surface of the first insulating member 81 on the side close to the first housing wall 11 along the wall thickness direction Z.

[0265] In the specific embodiment shown in Figure 18, the first insulating member 81 is not located between the first electrode terminal 31 and the second electrode terminal 32; that is, the first electrode terminal 31 is not pressed against the side of the first insulating member 81 facing away from the first housing wall 11. The side of the first insulating member 81 facing the first housing wall 11 abuts against the side of the second electrode terminal 32 facing away from the first housing wall 11, that is, the bending deformation of the second electrode terminal 32 is limited by a portion of the first insulating member 81. Here, the first insulating member 81 has suitable bending strength.

[0266] The first insulating member 81 is used at least to insulate the second electrode terminal 32 from the first electrode terminal 31, and can also be used to insulate the first electrode terminal 31 from the first housing wall 11.

[0267] In some specific embodiments, the first electrode terminal 31 and the second electrode terminal 32 are made of conductive metal, such as copper or aluminum; the first insulating component 81 is made of plastic, for example.

[0268] This allows the first electrode terminal and the second electrode terminal to be insulated from each other. Therefore, even if the first electrode terminal and the second electrode terminal have opposite polarities, the first insulating member can still abut against the second electrode terminal, thereby improving the bending resistance of the second electrode terminal. Moreover, if the first insulating member has suitable strength, it can limit the bending deformation of the second electrode terminal.

[0269] In some embodiments, as shown in Figures 13, 14 and 18, a first insulating member 81 is partially disposed between the first electrode terminal 31 and the first housing wall 11.

[0270] The first protrusion 314 includes a structure that partially protrudes from the first terminal plate 41 and also includes a structure that partially protrudes from the first insulating member 81. As shown in FIG13, when a portion of the first insulating member 81 (e.g., the first cover 811) abuts against the second electrode terminal 32 to restrict bending deformation, this portion of the first insulating member 81 (e.g., the first cover 811) corresponds to the first protrusion 314. When the first electrode terminal 31 and the first insulating member 81 abut against the second electrode terminal 32 to restrict bending deformation, the first protrusion 314 includes a portion protruding from the second electrode terminal 32 and a portion protruding from the first insulating member 81.

[0271] Optionally, the first electrode terminal 31 and the second electrode terminal 32 are connected to the positive electrode tab and the negative electrode tab respectively, with opposite polarities. The second electrode terminal 32 is at least partially disposed between the first insulating member 81 and the first housing wall 11. Further optionally, a first insulating member 81 is provided between the entire first electrode terminal 31 and the first housing wall 11, with a portion of the first insulating member 81 disposed between the first electrode terminal 31 and the first housing wall 11.

[0272] Optionally, the first electrode terminal 31 and the second electrode terminal 32 are connected to the same tab among the positive and negative electrodes and have the same polarity, and no insulating member may be provided between the first electrode terminal 31 and the second electrode terminal 32. Optionally, the second electrode terminal 32 is at least partially disposed between the first electrode terminal 31 and the first housing wall 11. Further optionally, a first insulating member 81 is provided between the entire first electrode terminal 31 and the first housing wall 11.

[0273] This allows the first electrode terminal 31 to be insulated from the battery cell casing 1, and also allows the first electrode terminal 31 and the second electrode terminal 32 to be insulated from each other. Therefore, even if the first electrode terminal 31 and the second electrode terminal 32 have opposite polarities, they can cooperate to improve the bending resistance of each electrode terminal, and also increase the design freedom of the electrode terminals on the battery cell casing. Moreover, if the first insulating member 81 has suitable strength, the bending deformation of the second electrode terminal 32 can be restricted by the first insulating member 81.

[0274] In some embodiments, as shown in Figures 8, 14 and 18, along the wall thickness direction of the first housing wall 11, the first electrode terminal 31, the first insulating member 81 and the second electrode terminal 32 partially overlap, and the portion of the first electrode terminal 31 that overlaps with the first insulating member 81 and the second electrode terminal 32 abuts against the first insulating member 81.

[0275] The first electrode terminal 31 abuts against the first insulating member 81 and is connected to the second electrode terminal 32 via the first insulating member 81.

[0276] Therefore, the bending deformation of the second electrode terminal 32 can be restricted by the first electrode terminal 31 and the first insulating member 81, and the first electrode terminal 31 and the second electrode terminal 32 are insulated from each other, thereby further increasing the ability of the first electrode terminal 31 to support and fix the second electrode terminal 32, and improving the bending deformation resistance of each electrode terminal; it can also strengthen the strength of the area in the first housing wall 11 where the electrode terminals are located; in addition, the polarity setting of the electrode terminals has a high degree of freedom.

[0277] In some embodiments, the first extension 61 is connected to the first terminal block 311 via a third connecting post, the first recess is disposed on the side of the second extension 62 facing the first electrode terminal 31, and the first protrusion is disposed on the side of the first extension 61 facing the second electrode terminal 32.

[0278] The arrangement of the first recess and the first protrusion can be shown in Figure 18, and will not be elaborated here.

[0279] Thus, a structure in which a protrusion and a recess are matched can be formed between the two extensions. The protrusion of the first extension 61, which is fixed to the first housing wall 11, presses the recess of the second extension 62 onto the first housing wall 11, thereby achieving mutual support between the two electrode terminals and improving the bending strength of the electrode terminals.

[0280] In some embodiments, as shown in Figures 14 and 18, the first recess 315 includes a first step portion 3151 and a second step portion 3152, the second step portion 3152 being disposed on the side of the first step portion 3151 away from the first terminal plate 41; the first protrusion 314 includes a protrusion provided by the first terminal plate 41 along the wall thickness direction Z of the first housing wall, a portion of the second terminal plate 42 being located between the protrusion and the first housing wall 11, the protrusion being at least partially accommodated in the step space formed by the first step portion 3151; the first protrusion 314 also includes a first cover portion 811 provided by the first insulating member 81 along the wall thickness direction of the first housing wall 11, a portion of the second terminal plate 42 being located between the first cover portion 811 and the first housing wall 11, the first cover portion 811 being at least partially accommodated in the step space of the second step portion 3152.

[0281] Here, the first step portion 3151 is formed by the portion of the second terminal plate 42 that decreases in height along the wall thickness direction of the first housing wall 11 towards the side away from the first housing wall 11, as shown in FIG18, where the second terminal plate is located in the second dashed frame (right dashed frame in FIG18). A second step portion 3152 is further formed at a position farther away from the protrusion than the first step portion 3151, as shown in FIG18, where the second terminal plate is located in the second dashed frame (right dashed frame in FIG18). The first insulating member 81 has a first covering portion 811, which covers the second step portion 3152 from the side away from the first housing wall 11 along the wall thickness direction of the first housing wall 11. The first protrusion 314 includes the protrusion and the first covering portion 811, wherein the first dashed frame (left dashed frame in FIG18) also includes a portion of the protrusion.

[0282] The first step portion 3151 is formed on the side surface of the second terminal plate 42 facing away from the first housing wall 11 along the wall thickness direction of the first housing wall 11. The protrusion is accommodated in the first step portion 3151, and the first insulating member 81 is located between the protrusion and the first step portion 3151.

[0283] The first insulating member 81 also has a portion that covers the surface of the protrusion that contacts the recess, so that when the protrusion is inserted into the first step portion 3151, the first insulating member 81 is clamped between the protrusion and the first step portion 3151, thereby maintaining an insulating state.

[0284] The second step portion 3152 may be the portion of the second terminal plate 42 that decreases in the thickness direction Z of the first housing wall relative to the surface furthest from the first housing wall 11; the first cover portion 811 may be part of the first insulating member 81. Along the thickness direction Z of the first housing wall, the first cover portion 811 may be partially or completely recessed into the second step portion 3152.

[0285] The lengths of the second step portion 3152 and the first cover portion 811 along the length direction X of the first housing wall can be determined based on the creepage distance to be provided. Generally, it is believed that the longer the lengths of the second step portion 3152 and the first cover portion 811 along the length direction X of the first housing wall, the greater the creepage distance and the higher the insulation reliability.

[0286] Therefore, the bending deformation of the second terminal plate 42 can be limited by the cooperation between the protrusion and the first step portion 3151, and the protrusion is at least partially accommodated in the first step portion 3151 to reduce the space occupied by the protrusion and improve space utilization. By providing the first cover portion 811, the creepage distance on the surfaces of the first electrode terminal 31 and the second electrode terminal 32 can be increased, improving insulation reliability. Moreover, by accommodating the first cover portion 811 in the second step portion 3152, the cover portion does not occupy additional space, thereby improving space utilization.

[0287] In some embodiments, as shown in FIG18, along the wall thickness direction of the first housing wall 11, the surface of the first cover portion 811 on the side opposite to the first housing wall 11 does not extend beyond the surface of the first terminal plate 41 on the side opposite to the first housing wall; and / or, along the wall thickness direction of the first housing wall 11, the surface of the first cover portion on the side opposite to the first housing wall does not extend beyond the surface of the second terminal plate 42 on the side opposite to the first housing wall 11.

[0288] The surface of the first cover portion 811 facing away from the first housing wall 11 may be substantially flush with or slightly lower than the surface of the first terminal plate 41 facing away from the first housing wall. Furthermore, the surface of the first cover portion 811 facing away from the first housing wall 11 may be substantially flush with or slightly lower than the surface of the second terminal plate 42 facing away from the first housing wall 11. In one specific embodiment, the surface of the first cover portion 811 facing away from the first housing wall 11, the surface of the first terminal plate 41 facing away from the first housing wall, and the surface of the second terminal plate 42 facing away from the first housing wall 11 are substantially flush with each other. Here, "substantially flush" means there is no significant step difference.

[0289] Since the surface of the first cover 811 facing away from the first housing wall 11 does not extend beyond the surface of the first terminal plate 41 and / or the second terminal plate 42 facing away from the first housing wall 11, the first cover 811 does not occupy additional space along the wall thickness direction of the battery cell or even the battery pack, and to a certain extent avoids interference between the first cover 811 and the busbar, making it easier for the busbar and the like to be reliably connected to the first terminal plate 41 and the second terminal plate 42.

[0290] In some embodiments, along the wall thickness direction Z of the first housing wall, the height between the surface of the first terminal plate 41 facing away from the housing wall and the surface of the second terminal plate 42 facing away from the first housing wall is greater than or equal to 0 and does not exceed 0.5 mm. For example, it can be 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm, or other values ​​within the above range.

[0291] Therefore, the first terminal plate 41 and the second terminal plate 42 are almost flush, which helps to share the external pressure and improve the resistance to deformation.

[0292] In some embodiments, as shown in FIG14, FIG8, FIG13 and FIG14, the battery cell 10 further includes a second insulating member 82, which is at least partially located between the second electrode terminal 32 and the first housing wall 11.

[0293] The second electrode terminal 32 may or may not have an insulating element between it and the first housing wall 11.

[0294] Optionally, the second electrode terminal 32 is connected to the negative electrode tab, and no insulating material is provided between the second electrode terminal 32 and the first housing wall 11, so that the first housing wall 11 and even the entire housing 1 are negatively charged.

[0295] Optionally, the second electrode terminal 32 is connected to the positive or negative electrode tab, and a second insulating element 82 is provided between the second electrode terminal 32 and the first housing wall 11, so that the first housing wall 11 and even the entire housing 1 are insulated from the second electrode terminal 32 and are not charged.

[0296] This allows the second electrode terminal 32 to be insulated from the outer casing 1 of the battery cell. Therefore, it is applicable not only to designs where the outer casing is charged, but also to designs where the outer casing is not charged.

[0297] In some embodiments, the first insulating member 81 and the second insulating member 82 are integrally formed parts.

[0298] Yes, the first insulating component 81 and the second insulating component 82 can be separately molded parts, or they can be molded as a single integral part. As for the molding method, common molding techniques can be used, such as die molding.

[0299] The first insulating member 81 and the second insulating member 82 can be formed into a shallow tray shape that generally matches the shape of the first electrode terminal 31 and the second electrode terminal 32, so as to accommodate the first electrode terminal 31 and the second electrode terminal 32 and to insulate them from the bottom and peripheral surfaces of the first electrode terminal 31 and the second electrode terminal 32 along the wall thickness direction Z of the first housing wall.

[0300] This reduces the number of parts and simplifies the assembly process.

[0301] In some embodiments, as shown in FIG8, a first recess 131 and a second recess 132 are formed in the first housing wall 11, and at least a portion of the first insulating member 81 and at least a portion of the second insulating member 82 are located in the first recess 131 and the second recess 132, respectively.

[0302] The first recess 131 or the second recess 132 is a recessed region formed by thinning the first housing wall 11 along the thickness direction Z of the first housing wall. The top view shape of the recessed region (the shape observed along the thickness direction Z of the first housing wall) can be configured to accommodate at least a portion of the first insulator 81 and at least a portion of the second insulator 82. The recess depth of the recessed region can be substantially the same as or slightly lower than the height of the first insulator 81 or the second insulator 82 (the dimension along the thickness direction Z of the first housing wall). Of course, the heights of the first recess 131 and the second recess 132 can be the same or different.

[0303] One, two or more recesses may be formed on the first housing wall 11.

[0304] Corresponding to the recessed area, the portions of the first insulating member 81 and the second insulating member 82 located in the recess are formed with protrusions that can fit into the recess, thereby restricting the movement of the first insulating member 81 and the second insulating member 82 relative to the first housing wall 11 in the surface direction of the first housing wall 11 (the direction perpendicular to the wall thickness direction Z of the first housing wall).

[0305] By embedding at least a portion of the first insulating member 81 and at least a portion of the second insulating member 82 into the recess on the first housing wall, it is beneficial to improve the installation strength of the insulating member relative to the first housing wall 11, reduce the possibility of the insulating member shifting along the surface of the first housing wall 11, and facilitate the positioning of the insulating member and the first housing wall 11 during assembly.

[0306] In some embodiments, as shown in FIG8, the first recess 131 and the second recess 132 form the same recess.

[0307] This reduces the number of parts and simplifies the assembly process.

[0308] In some embodiments, as shown in Figures 13 and 14, a first recess 315 is provided on the side of the second extension 62 facing the first electrode terminal 31, and a first protrusion 314 is provided on the side of the first main body 51 facing the second electrode terminal 32.

[0309] The first main body 51 is fixedly connected to the first housing wall 11 by the first connecting post 312, thus the connection between the first main body 51 and the first housing wall 11 is firm. Moreover, the shape of the first main body 51 is less prone to bending compared to the first extension 61. Therefore, a first protrusion 314, which mainly serves to prevent warping, is provided in the first main body 51, and a first recess 315 is provided in the second extension 62, which is prone to warping. The first recess 315 is located between the first protrusion 314 and the first housing wall 11. Therefore, the first protrusion 314 prevents the first recess 315 and the second extension 62 from warping away from the first housing wall 11 to a certain extent.

[0310] Therefore, the first recess 315 provided in the second extension 62 can be abutted against by the first protrusion 314 provided in the first main body 51 and fixed between the first protrusion 314 and the first housing wall 11, thereby preventing the second extension 62 from warping away from the first housing wall 11 due to its longer extension, and improving the bending strength of the second extension 62 and the entire second electrode terminal 32. Even if the busbar or other components exert a pulling force on the electrode terminal, the electrode terminal is not easily bent or broken, improving the connection reliability between the busbar and the electrode terminal.

[0311] For the first extension 61, one end of which extends away from the first main body 51 can be fixed to the first housing wall 11 by the third connecting post 325.

[0312] In the embodiments shown in Figures 12 to 14, only one mutually cooperating protrusion and recess are provided, but more protrusions and recesses can also be provided.

[0313] In some embodiments, as shown in FIG20, the first electrode terminal 31 is further provided with a second recess 316, and the second electrode terminal 32 is further provided with a second protrusion 317. The second protrusion 317 and the second recess 316 overlap at least partially along the wall thickness direction Z of the first housing wall. The second protrusion 317 and the second recess 316 cooperate with each other. The second recess 316 is provided on the side of the first extension 61 facing the second electrode terminal 32, and the second protrusion 317 is provided on the side of the second main body 52 facing the first electrode terminal 31.

[0314] The second protrusion 317 refers to a portion of the structure that extends from the second electrode terminal 32 and enters the outer contour of the first electrode terminal 31. The second recess 316 refers to a recess formed relative to the surface of the first electrode terminal 31 that can accommodate the second protrusion 317. The recess can be formed by a groove or by a step. When the recess is formed by a step, it can include a single step, or it can include a second step or more steps.

[0315] Therefore, the cooperation between the second protrusion 317 and the second recess 316 facilitates the support and fixation of the second electrode terminal 32 on the first electrode terminal 31, improves the bending strength of the first electrode terminal 31, and facilitates processing; by setting the second protrusion 317 in the second recess 316, the space occupied by the second protrusion 317 is reduced, and the space utilization rate is improved.

[0316] In some embodiments, as shown in FIG20, the second recess 316 includes a third step portion 3161 and a fourth step portion 3162. The fourth step portion 3162 is disposed on the side of the third step portion 3161 away from the second electrode terminal 32. The third step portion 3161 is a partial structure within the third dashed frame (the left dashed frame in FIG20), wherein the third dashed frame also includes a partial protrusion. The fourth step portion 3162 is a partial structure within the fourth dashed frame (the right dashed frame in FIG20). The second protrusion 317 includes the portion provided on the second electrode terminal 32. The protrusion 317 extends along the thickness direction Z of the first housing wall, with a portion of the first electrode terminal 31 located between the protrusion and the first housing wall 11, and the protrusion is at least partially accommodated in the step space formed by the third step portion 3161; the second protrusion 317 also includes a second cover portion 812 provided by the second insulating member 82, along the thickness direction Z of the first housing wall, with a portion of the first electrode terminal 31 located between the second cover portion 812 and the first housing wall 11, and the second cover portion 812 is at least partially accommodated in the step space formed by the fourth step portion 3162.

[0317] Here, the third step portion 3161 is formed by the portion of the first electrode terminal 31 that decreases in height along the wall thickness direction of the first housing wall 11 towards the side away from the first housing wall 11, as shown in FIG20 where the first electrode terminal is located in the fourth dashed frame (right dashed frame in FIG20). A fourth step portion 3162 is further formed at a position farther away from the protrusion than the third step portion 3161, as shown in FIG20 where the first electrode terminal is located in the fourth dashed frame (right dashed frame in FIG20). The second insulating member 82 has a second covering portion 812, which covers the fourth step portion 3162 from the side away from the first housing wall 11 along the wall thickness direction of the first housing wall 11. The second protrusion 317 includes the protrusion and the second covering portion 812, wherein the third dashed frame (left dashed frame in FIG20) also includes a portion of the protrusion.

[0318] The second protrusion 317 includes a protrusion and a second cover 812; the second recess 316 includes a third step 3161 and a fourth step 3162.

[0319] The third step portion 3161 is formed on the side surface of the first electrode terminal 31 facing away from the first housing wall 11 along the wall thickness direction of the first housing wall 11. The protrusion is accommodated in the third step portion 3161, and the second insulating member 82 is located between the protrusion and the third step portion 3161.

[0320] The second insulating member 82 also has a portion that covers the surface of the protrusion that contacts the recessed portion, so that when the protrusion is inserted into the third step portion 3161, the second insulating member 82 is clamped between the protrusion and the third step portion 3161, thereby maintaining the insulating state.

[0321] As shown in FIG20, a fourth step portion 3162 is further formed on the first electrode terminal 31 at a position further away from the protrusion than the third step portion 3161. The second insulating member 82 has a second covering portion 812, which covers the fourth step portion 3162 from the side away from the first housing wall 11 along the wall thickness direction of the first housing wall 11.

[0322] The fourth step portion 3162 may be the portion of the first electrode terminal 31 that decreases in height along the wall thickness direction Z of the first housing wall relative to the surface furthest from the first housing wall 11; the second cover portion 812 may be part of the second insulating member 82. Along the wall thickness direction Z of the first housing wall, the second cover portion 812 may be partially or completely recessed into the fourth step portion 3162.

[0323] The lengths of the fourth step portion 3162 and the second cover portion 812 along the length direction X of the first housing wall can be determined based on the creepage distance to be provided. Generally, it is believed that the longer the lengths of the fourth step portion 3162 and the second cover portion 812 along the length direction X of the first housing wall, the greater the creepage distance and the higher the insulation reliability.

[0324] Therefore, the bending deformation of the first electrode terminal can be limited by the cooperation between the protrusion and the third step, and the protrusion is at least partially accommodated in the third step to reduce the space occupied by the protrusion and improve space utilization. By providing the second cover, the creepage distance on the surfaces of the first and second electrode terminals can be increased, improving insulation reliability. Moreover, by accommodating the second cover in the step, the second cover does not occupy additional space, thereby improving space utilization.

[0325] In some embodiments, the minimum cross-sectional area through which the current passes in the extension 6 is S1, and the capacity of the battery cell 10 is P, then the ratio of S1 to P is in the range of 0.2 to 0.3, wherein the unit of capacity is Ah.

[0326] Taking S1 as an example, representing the minimum cross-sectional area through which current flows through the second extension 62, where 0.2 ≤ S1 / P ≤ 0.3. Optionally, S1 / P = 0.2, S1 / P = 0.21, S1 / P = 0.22, S1 / P = 0.23, S1 / P = 0.24, S1 / P = 0.25, S1 / P = 0.26, S1 / P = 0.27, S1 / P = 0.28, S1 / P = 0.29, or S1 / P = 0.3, etc., and the ratio of S1 / P can also be other ratios within the above range. Of course, the ratio of S1 / P can also be in other ranges, for example, S1 / P = 0.19. The ratio of the minimum cross-sectional area through which current flows in the first extension 61 or the second extension 62 to the capacity of the battery cell 10 can be the same or different.

[0327] Of course, the minimum cross-sectional area through which the current is supplied in the first extension 61 and the minimum cross-sectional area through which the current is supplied in the second extension 62 can be the same or different.

[0328] The ratio of S1 to P is set within a suitable range so that the extension has a suitable flow capacity.

[0329] In some embodiments, as shown in FIG7, along the length direction X of the first housing wall, the first extension 61 and the second extension 62 are located between the first main body 51 and the second main body 52; along the width direction Y of the first housing wall, the first extension 61 and the second extension 62 have a first overlapping portion 91, and the width direction Y of the first housing wall is the width direction of the first housing wall 11.

[0330] As shown in Figure 7, along the width direction Y of the first housing wall, the first extension 61 and the second extension 62 have overlapping portions, namely, the portions of the first extension 61 and the second extension 62 located within the dashed boxes in the figure. This portion is referred to as the first overlapping portion 91. Here, the first overlapping portion 91 is not necessarily the portion where the first extension 61 and the second extension 62 overlap and contact each other; it includes the case where the projection portions of the first extension 61 and the second extension 62 are projected onto the same projection plane along the width direction Y of the first housing wall, or their projection portions or completely overlap.

[0331] Therefore, by arranging the first extension 61 and the second extension 62 to overlap in the width direction Y of the first housing wall, the bending strength of the area in the first housing wall 11 where the electrode terminals are located can be improved by utilizing the synergistic effect of the two electrode terminals. Moreover, the first electrode terminal 31 and the second electrode terminal 32 can be arranged as compactly as possible, which is beneficial for utilizing the non-electrode terminal area of ​​the first housing wall 11, thereby improving the volume utilization rate of the battery pack.

[0332] In some embodiments, as shown in FIG7, the material of the first main body portion 51 and / or the second main body portion 52 is different from the material of the first overlapping portion.

[0333] For example, one of them can be made of aluminum and the other of copper. In some specific embodiments, for example, the material of the first main body 51 on the positive electrode side can be set to a metal material with better thermal conductivity.

[0334] This allows for the selection of materials for the first main body 51 and the second main body 52, which helps to reduce current loss and improve heat dissipation.

[0335] In some embodiments, as shown in FIG7, the length of the first housing wall 11 along the length direction X of the first housing wall is L, and the length of the first overlapping portion along the length direction of the first housing wall is A, then A is in the range of 10% to 40% of L.

[0336] The length L of the first housing wall 11 along the length direction X refers to the maximum length of the outer contour of the first housing wall 11 along the length direction X. A can be 10%, 20%, 25%, 30%, 35%, or 40% of L.

[0337] Therefore, setting the first overlapping portion 91 to be longer is beneficial to improving the strength of the electrode terminal 3 setting area in the first housing wall 11 and even the entire first housing wall.

[0338] In some embodiments, as shown in FIG7, the length A of the first overlapping portion 91 along the length direction of the first housing wall is in the range of 3 mm to 50 mm.

[0339] For example, A can be 3mm, 5mm, 8mm, 10mm, 15mm, 20mm, 30mm, 40mm, or 50mm. It can also be other length values ​​within the above range.

[0340] Therefore, setting the first overlapping portion 91 to be longer is beneficial to improving the strength of the electrode terminal setting area in the first housing wall and even the entire first housing wall.

[0341] In some embodiments, along the length direction X of the first housing wall, the first main body portion 51 and the second main body portion 52 have a second overlapping portion.

[0342] As shown in Figure 7, along the length direction X of the first housing wall, the first main body portion 51 and the second main body portion 52 have an overlapping portion that overlaps with each other. This portion is referred to as the second overlapping portion. Here, the second overlapping portion is not necessarily the part where the first main body portion 51 and the second main body portion 52 overlap and contact each other. It includes the case where the projection portions of the first main body portion 51 and the second main body portion 52 are projected onto the same projection plane along the length direction X of the first housing wall, or their projection portions or completely overlap.

[0343] Therefore, since the first housing wall has overlapping portions in both the length direction X and the width direction Y, the first electrode terminal 31 and the second electrode terminal 32 can be arranged compactly in both the length direction and the width direction of the first housing wall, and the bending strength of the first housing wall 11 can be further improved.

[0344] In some embodiments, as shown in FIG7, the length of the first housing wall 11 along the width direction Y is W, and the length of the second overlapping portion along the width direction Y of the first housing wall is B, then B is in the range of 20% to 90% of W.

[0345] The length of the first housing wall 11 along the width direction Y refers to the maximum length of the outer contour of the first housing wall 11 along the width direction Y. B can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 60%, 70%, 75%, 80%, or 90% of W. It can also be a proportion within the above range.

[0346] Therefore, setting the length of the second overlapping region along the width direction Y of the first shell wall to be relatively long is beneficial to enhancing the strength of the first shell wall 11.

[0347] In some embodiments, as shown in FIG7, the closest distance between the first electrode terminal 31 and the second electrode terminal 32 along the length direction X and the width direction Y of the first housing wall is greater than or equal to 0.3 mm.

[0348] Here, the closest distance between the first electrode terminal 31 and the second electrode terminal 32 refers to the distance between the closest points of the first electrode terminal 31 and the second electrode terminal 32. This closest distance is greater than or equal to 0.3 mm, and can be, for example, 0.3 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, etc. Generally, when there is an insulating space between the close points of the first electrode terminal 31 and the second electrode terminal 32, it is considered that they can be positioned closer together, for example, the closest distance can be set to 0.3 mm or greater. When there is no insulating space between the close points of the first electrode terminal 31 and the second electrode terminal 32, it is considered that they can be positioned slightly further apart, for example, the closest distance can be set to 2 mm or greater.

[0349] This reduces the possibility of short-circuiting between the first electrode terminal and the second electrode terminal.

[0350] In some embodiments, as shown in FIG7, the first electrode terminal 31 includes a first terminal plate 41, the second electrode terminal 32 includes a second terminal plate 42, and both the first electrode terminal 31 and the second electrode terminal 32 include a connection area 93 for connection with the busbar 2. The busbar 2 is used to electrically connect multiple battery cells 10 to each other, and the connection area 93 is formed at least in the first overlapping portion.

[0351] Here, the connection area 93 (the area shaded by a diagonal line in Figure 7) is the surface area of ​​the first electrode terminal 31 and the second electrode terminal 32 that connects to the busbar 2. This connection includes welding, which can be ultrasonic welding, laser welding, or other suitable welding methods.

[0352] In the specific embodiment shown in Figure 15, the busbar 2 is configured as a rectangular thin plate, but it is not limited to a rectangle and can also be other suitable shapes. In addition, it is not limited to a plate shape and can also adopt other suitable three-dimensional shapes.

[0353] Therefore, the busbar 2 is connected to the portion that forms the first overlapping part in the first electrode terminal 31 and the second electrode terminal 32. Since this portion has strong bending strength, even if the busbar causes bending stress to act on the first electrode terminal, the second electrode terminal, and the first housing wall, the first electrode terminal, the second electrode terminal, and the first housing wall are not easily bent or deformed, and are less likely to break due to bending deformation.

[0354] In some embodiments, as shown in FIG7, a connection area is also formed in at least one of the first body portion 51 and the second body portion 52.

[0355] This can further enhance the connection strength between the electrode terminals and the busbar, further disperse the bending stress caused by the busbar, and further improve the deformation resistance of the electrode terminals and the first housing wall.

[0356] In some embodiments, if the area of ​​the connection region formed in the first overlapping portion is SA and the area of ​​the entire connection region is S, then SA accounts for 50% to 100% of S.

[0357] SA represents the area of ​​the connecting region formed in the first overlapping portion. S represents the total area of ​​the connecting region. The ratio of SA to S ranges from 50% to 100%, i.e., 50% ≤ SA / S ≤ 100%. If the connecting region is only located in the first overlapping portion, then the ratio of SA to S is 100%.

[0358] Optionally, SA / S = 50%, SA / S = 60%, SA / S = 70%, SA / S = 80%, SA / S = 90%, or SA / S = 100%, etc., or other values ​​within the above range.

[0359] SA and S measurements can be performed using existing area measurement methods or by using software to calculate based on the acquired images.

[0360] Therefore, in addition to being set in the extension section, the connection area can also be set in the non-extension section. The setting of the connection area is highly flexible, which helps to increase the area of ​​the connection area, improve the connection strength, and increase the flow area.

[0361] In some embodiments, as shown in FIG7, if the offset distance of the centerline position of the connection area formed in the first extension 61 in the width direction Y of the first housing wall relative to the centerline position of the first housing wall 11 in the width direction Y of the first housing wall is B3, then B3 is in the range of 15% to 27% of W.

[0362] B3 represents the offset distance of the centerline position of the connection area formed in the first extension 61 in the width direction Y of the first housing wall relative to the centerline position of the first housing wall 11 in the width direction Y of the first housing wall. The ratio of B3 to W ranges from 15% to 27%, that is, 15% ≤ B3 / W ≤ 27%.

[0363] Optional values ​​are B3 / W = 15%, B3 / W = 17%, B3 / W = 19%, B3 / W = 20%, B3 / W = 22%, B3 / W = 24%, B3 / W = 25%, B3 / W = 26%, or B3 / W = 27%, etc., or other values ​​within the above range.

[0364] By setting B3 to be no less than 15% of W, the first extension 61 is made to have a sufficient distance from the center, which helps to ensure a sufficient safe distance between the first extension 61 and the second extension 62; by setting B3 to be no greater than 27% of W, the first extension 61 is made to have a certain distance from the edge of the first housing wall 11.

[0365] In some embodiments, as shown in FIG18, the electrode terminals include a first electrode terminal 31 and a second electrode terminal 32. The first electrode terminal 31 is provided with a first protrusion 314, and the second electrode terminal 32 is provided with a first recess 315. The first protrusion 314 and the first recess 315 at least partially overlap along the wall thickness direction Z of the first housing wall, and the first protrusion 314 and the first recess 315 cooperate with each other.

[0366] The first protrusion 314 refers to a portion of the structure that extends from the first electrode terminal 31 and enters the outer contour of the second electrode terminal 32. The first recess 315 refers to a recess formed relative to the surface of the second electrode terminal 32 that can accommodate the first protrusion 314. The recess can be formed by a groove or by a step. When the recess is formed by a step, it can include a single step, or it can include a second step or more steps.

[0367] Here, the first protrusion 314 and the first recess 315, in their mating state, can at least mutually restrict displacement along the thickness direction Z of the first housing wall. Optionally, the first protrusion 314 and the first recess 315, in their mating state, can also restrict displacement along the length direction X and / or the width direction Y of the first housing wall.

[0368] Therefore, the cooperation between the first protrusion and the first recess facilitates the support and fixation of the first electrode terminal on the second electrode terminal, improves the bending strength of the second electrode terminal, and facilitates processing; by setting the first protrusion in the first recess, the space occupied by the first protrusion is reduced, thereby improving space utilization.

[0369] In some embodiments, the electrode terminal 3 includes a first electrode terminal 31 and a second electrode terminal 32. The first electrode terminal 31 includes a first terminal plate 41, at least a portion of which is disposed on the side of the first housing wall 11 away from the receiving space 12. The second electrode terminal 32 includes a second terminal plate 42, which is disposed on the side of the first housing wall 11 away from the receiving space 12. Along the wall thickness direction Z of the first housing wall, the first terminal plate 41 and the second terminal plate 42 partially overlap, and the first terminal plate 41 directly or indirectly abuts against the second terminal plate 42.

[0370] The first terminal plate 41 is directly or indirectly abutted against the second terminal plate 42. The first terminal plate can directly abut against the second terminal plate 42, and the terminal block may not be included in the middle.

[0371] Therefore, by setting the first terminal plate 311 and the second terminal plate 321 to be interlocked, the bending strength of the electrode terminal 3 and the first housing wall 11 can be further improved; moreover, the first terminal plate 311 and the second terminal plate 321 can be electrically connected to each other, which facilitates the simplification of the connection structure when the two electrode terminals 3 have the same polarity.

[0372] In some embodiments, the electrode terminal 3 includes a first electrode terminal 31 and a second electrode terminal 32. The first electrode terminal 31 includes a first terminal plate 41, at least a portion of which is disposed on the side of the first housing wall 11 away from the receiving space 12. The first terminal plate 41 includes a first main body portion 51 and a first extension portion 61 connected to each other. The second electrode terminal 32 includes a second terminal plate 42, which is disposed on the side of the first housing wall 11 away from the receiving space 12. The second terminal plate 42 includes a second main body portion 52 and a second extension portion 62 connected to each other. Along the length direction X of the first housing wall, the first extension portion 61 and the second extension portion 62 are located between the first main body portion 51 and the second main body portion 52, and the first extension portion 61 and the second extension portion 62 are arranged along the width direction Y of the first housing wall.

[0373] In some embodiments, the first extension 61 and the second extension 62 may be arranged away from each other along the length direction X of the first housing wall, and the first extension 61 and the second extension 62 may be arranged along the width direction Y of the first housing wall; the first extension 61 and the second extension 62 may be arranged close to each other along the length direction X of the first housing wall, and the first extension 61 and the second extension 62 may be arranged along the width direction Y of the first housing wall; the first extension 61 and the second extension 62 may be arranged close to each other along the length direction X of the first housing wall, and the first extension 61 and the second extension 62 may also be arranged along the width direction Y of the first housing wall, and the first extension 61 and the second extension 62 may have an overlapping portion along the width direction Y of the first housing wall.

[0374] The design of the terminal blocks can improve heat dissipation, support for the first housing wall, and connection strength with the busbar by making the terminal blocks larger. The shape design of each terminal block has a high degree of freedom.

[0375] In some embodiments, along the wall thickness direction of the first housing wall 11, the portion where the first electrode terminal 31 and the second electrode terminal 32 overlap is an overlapping region. The length of the overlapping region along the width direction of the first housing wall is W11, and the length of the first housing wall 11 along the width direction is W. W11 is in the range of 10% to 90% of W. The length direction X of the first housing wall is the length direction of the first housing wall 11, and the width direction Y of the first housing wall is the width direction of the first housing wall 11.

[0376] The overlapping region refers to the area where the second electrode terminal 32 is located between the first electrode terminal 31 and the first housing wall 11, thus forming an overlapping area between the second electrode terminal 32 and the first electrode terminal 31 along the wall thickness direction of the first housing wall 11. In Figure 21, W11 represents the length of the overlapping region along the width direction Y of the first housing wall.

[0377] The length of the first housing wall 11 along the width direction Y refers to the largest dimension of the outer contour of the first housing wall 11 along the width direction of the first housing wall. In Figure 21, W represents the length of the first housing wall 11 along the width direction Y.

[0378] The length W11 of the overlapping area along the width direction of the first shell wall can be 10% to 90% of the length W of the first shell wall 11 along the width direction of the first shell wall, that is, W11 / W is between 10% and 90%. For example, it can be 10%, 15%, 20%, 30%, 50%, 70%, 90%, or other values ​​within the above range.

[0379] Therefore, the first housing wall 11 can be fully utilized along the width direction Y of the first housing wall, and the supporting force between the first electrode terminal 31 and the second electrode terminal 32 can be reliably improved, the bending strength of the electrode terminal can be improved, and the strength of the first housing wall around the electrode terminal can be strengthened.

[0380] In some embodiments, the length W11 of the overlapping area along the width direction Y of the first housing wall is in the range of 0.5 mm to 50 mm.

[0381] For example, the length W11 of the overlapping area along the width direction Y of the first housing wall can be 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 15mm, 20mm, 30mm, 40mm, or 50mm. Of course, it can also be other values ​​in the range of 0.5mm to 50mm.

[0382] Therefore, the length W11 of the overlapping area along the width direction of the first housing wall can be determined according to the length W of the first housing wall along the width direction of the first housing wall. By setting the length W11 of the overlapping area along the width direction of the first housing wall to be larger, the supporting force between the first electrode terminal 31 and the second electrode terminal 32 can be improved, the bending strength of the electrode terminal can be improved, and the strength of the first housing wall around the electrode terminal can also be strengthened.

[0383] In some embodiments, as shown in FIG14, the length L11 of the overlapping region along the length direction X of the first housing wall is in the range of 0.5 mm to 6 mm.

[0384] For example, the length L11 of the overlapping area along the length direction X of the first housing wall can be 0.5mm, 1mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, or 6mm. Of course, it can also be other values ​​within the range of 0.5mm to 6mm.

[0385] Therefore, by setting the length L11 of the overlapping area along the length direction of the first shell wall to be smaller, the fit strength between the protrusion and the recess can be improved, and the space utilization rate can be improved.

[0386] In some embodiments, the first extension 61 is offset relative to the center position of the first main body 51 along the width direction Y of the first housing wall; and / or, the second extension 62 is offset relative to the center position of the second main body 52 along the width direction Y of the first housing wall.

[0387] As shown in Figure 21, the position of the dashed line O represents the center position of the first main body 51 along the width direction Y of the first housing wall, the dashed line O1 represents the center position of the first extension 61 along the width direction Y of the first housing wall, and the dashed line O2 represents the center position of the second extension 62 along the width direction Y of the first housing wall. The offset distance can be 15% to 27% of the width of the first housing wall 11.

[0388] Therefore, the dimensions of the first housing wall along the width direction can be fully utilized to arrange the first extension and the second extension along the width direction of the first housing wall, which is beneficial for compactly configuring the first electrode terminal and the second electrode terminal.

[0389] In some embodiments, the length of the long side of the first housing wall 11 is less than or equal to 450 mm.

[0390] The length of the first housing wall 11 (or the length of the battery cell 10) can be less than or equal to 450mm, for example, it can be 450mm, 400mm, 350mm, 300mm, or 200mm.

[0391] This allows for full utilization of the narrower sidewalls of the elongated battery cells to configure electrode terminals, improving the flexibility of battery cell assembly and facilitating large-area heat dissipation.

[0392] A second aspect of this disclosure provides a battery comprising: a housing 20 and at least two battery cells 10 provided in the first aspect.

[0393] Because the battery uses the aforementioned battery cell 10, the heat dissipation capacity of the electrode terminals in the battery cell 10 is improved, thereby enhancing the battery's performance.

[0394] In some embodiments, as shown in FIG15, each battery cell 10 is arranged along the width direction of the first housing wall.

[0395] This helps to improve the volume utilization rate of the battery.

[0396] In some embodiments, the first electrode terminal 31 includes a first electrode terminal 31, which includes a first body portion 51 and a first extension portion 61 connected to each other. The second electrode terminal 32 includes a second body portion 52 and a second extension portion 62 connected to each other. Along the length direction of the first housing wall, at least a portion of the first extension portion 61 and at least a portion of the second extension portion 62 are located between the first body portion 51 and the second body portion 52. In adjacent battery cells, the first extension portion 61 of one battery cell 10 and the second extension portion 62 of another battery cell 10 are arranged along the width direction Y and are electrically connected through the busbar 2.

[0397] Since the busbar 2 is connected to the first extension 61 and the second extension 62 located between the first main body 51 and the second main body 52, the connection part has strong bending resistance. Therefore, the first electrode terminal 31, the second electrode terminal 32 and the first housing wall 11 are not prone to bending deformation or breakage, thereby improving the reliability of the battery.

[0398] In some embodiments, in the same battery cell 10, along the width direction of the first housing wall, the first extension 61 and the second extension 62 have a first overlapping portion 91 (see FIG7). In adjacent battery cells 10, the first overlapping portion 91 of one battery cell and the first overlapping portion 91 of another battery cell are electrically connected by a busbar 2.

[0399] Therefore, the busbar 2 is connected to the portion forming the first overlapping portion 91 in the first electrode terminal 31 and the second electrode terminal 32. Since this portion has strong bending resistance, even if the busbar 2 causes bending stress to act on the first electrode terminal 31, the second electrode terminal 32, and the first housing wall 11, the first electrode terminal 31, the second electrode terminal 32, and the first housing wall 11 are not easily bent or deformed, and are less likely to break due to bending deformation, thereby improving the reliability of the battery.

[0400] In some embodiments, as shown in FIG17, at least one wall of the housing 20 has a boss 111a, which is formed by the housing wall protruding in a direction away from the battery cell 10. The boss 111a forms a receiving portion 111b on the side facing the battery cell 10. Along the direction perpendicular to the housing wall where the boss 111a is formed, the projection of the first electrode terminal 31 and the second electrode terminal 32 does not exceed the projection of the boss 111a. Furthermore, at least a portion of the first electrode terminal 31, the second electrode terminal 32, and the busbar 2 enters the receiving portion 111b.

[0401] Therefore, it is possible to increase the height of the housing only at the locations of the first electrode terminal, the second electrode terminal, and the busbar, thereby suppressing the size of the battery and improving the volume utilization rate of the battery.

[0402] A third aspect of this disclosure provides an electrical device comprising a plurality of battery cells 10 provided in the first aspect or batteries provided in the second aspect, wherein the battery cells 10 or batteries supply power to the electrical device.

[0403] Therefore, it is possible to provide an electrical device with a battery cell 10 or battery that has strong heat dissipation capacity at the electrode terminals, thereby improving the performance of the electrical device.

[0404] A fourth aspect of this disclosure provides an energy storage device comprising a plurality of battery cells 10 provided in the first aspect or batteries provided in the second aspect, wherein the battery cells 10 or batteries are configured to store electrical energy and to provide electrical energy.

[0405] Therefore, it is possible to provide an energy storage device with a battery cell 10 or battery that has strong heat dissipation capacity at the electrode terminals, thereby improving the performance of the energy storage device.

[0406] In one specific embodiment, the battery cell 10 includes a housing 1, an electrode assembly 7, and electrode terminals 3. The housing 1 has a receiving space 12 and includes a first housing wall 11, which serves as an end cap for the housing 1. The electrode assembly 7 is disposed in the receiving space 12, and the electrode terminals 3 are disposed on the first housing wall 11. The electrode terminals 3 include a terminal plate 4 for connecting to the busbar 2. The terminal plate 4 includes a main body 5 and an extension 6. The electrode terminals 3 adopt a partially protruding structure to increase the circumference of the electrode terminals 3 and increase the heat dissipation area. The protruding structure is the extension 6, which is provided with solder pads (only a portion of the solder pad is present), which can increase the solder pad area and improve the current carrying capacity.

[0407] In the same terminal board 4, the ratio of the length of an extension 6 along the width direction Y of the first housing wall to the length of the main body 5 along the width direction Y of the first housing wall is in the range of 0.4 to 0.8. Here, the length direction X of the first housing wall is the length direction of the first housing wall 11, and the width direction Y of the first housing wall is the width direction of the first housing wall 11. The smaller the ratio, the better, as it can effectively improve heat dissipation performance. The smaller the ratio, the more extensions can be added. One terminal board 4 can have multiple extensions 6.

[0408] The ratio of the length of the terminal plate 4 along the width direction Y of the first housing wall to the length of the first housing wall 11 along the width direction Y is in the range of 0.6 to 0.9. This maximizes the length of the terminal plate 4 along the width direction Y of the first housing wall, thereby improving the heat dissipation capacity of the terminal plate 4. In a single terminal plate 4, there can be one or more extensions 6. When there are two extensions 6, they can be arranged symmetrically relative to the length direction X of the first housing wall.

[0409] In the same terminal board 4, the ratio of the length of the extension 6 along the length direction X of the first housing wall to the length of the terminal board 4 along the length direction X of the first housing wall is greater than or equal to 0.5 and less than 1. The longer the length of the terminal board 4 along the length direction X of the first housing wall, the better, as it can effectively improve the heat dissipation performance of the terminal board 4. The ratio of the length of the terminal board 4 along the length direction X of the first housing wall to the length of the first housing wall 11 along the length direction X of the first housing wall is in the range of 0.2 to 0.7. The longer the length of the terminal board 4 along the length direction X of the first housing wall, the better its heat dissipation capacity.

[0410] In the same terminal plate 4, the ratio of the length of the terminal plate 4 along the length direction X of the first housing wall to the length of the terminal plate 4 along the width direction Y of the first housing wall is in the range of 3.5 to 10. The terminal plate 4 is set to be slender, which further improves the heat dissipation performance of the electrode terminal 3.

[0411] A portion of the electrode plate is soldered onto the extension 6, which increases the soldering area. During the soldering process to the center of the electrode terminal 3, if S1 represents the minimum cross-sectional area through which current flows through one of the extensions 6, and P represents the capacity of the battery cell 10, then the ratio of S1 to P is in the range of 0.2 to 0.3, where the unit of capacity is AL, thereby providing suitable overcurrent capability.

[0412] The battery cell 10 includes a first electrode terminal 31 and a second electrode terminal 32. The terminal plate 4 includes a first terminal plate 41 and a second terminal plate 42. The first electrode terminal 31 has a first terminal plate 41, which includes a first main body portion 51 and a first extension portion 61. The second electrode terminal 32 is disposed on the first housing wall 11 and has a second terminal plate 42. The second terminal plate 42 has a second main body portion 52 and a second extension portion 62 protruding from the second main body portion 52 along the length direction X of the first housing wall, which is the length direction of the first housing wall 11. Along the width direction Y of the first housing wall, the first extension portion 61 and the second extension portion 62 have a first overlapping portion 91, which is the width direction of the first housing wall 11. The length of the first overlapping portion 91 along the length direction X of the first housing wall is in the range of 3mm to 50mm.

[0413] Both the first terminal plate 41 and the second terminal plate 42 include a connection area 93 for connection with the busbar 2, which is used to electrically connect multiple battery cells 10 to each other. The connection area is formed at least in the first overlapping portion 91. The connection area 93 is arranged with tabs, which can merge two rows of tabs into one row. If SA represents the area of ​​the connection area 93 formed in the first overlapping portion 91, and S represents the total area of ​​the connection area 93, then SA accounts for 50% to 100% of S.

[0414] If B3 represents the offset distance of the centerline position of the connection area formed in the first extension 61 in the width direction Y of the first housing wall relative to the centerline position of the first housing wall 11 in the width direction Y of the first housing wall, then B3 is in the range of 15% to 27% of W. On the one hand, this eliminates the need for material in the original first overlapping portion 91, reducing the weight of the battery pack and achieving cost reduction. On the other hand, it is beneficial for the arrangement of the battery cells. If the size of B3 is too small, the battery cells on adjacent extensions are prone to interference; if the size of B3 is too large, it will be too close to the solder mark on the other battery cell 10, affecting the welding.

[0415] The various embodiments / implementations provided in this disclosure can be combined with each other without creating contradictions.

[0416] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure. Industrial applicability

[0417] This disclosure provides a battery cell, a battery, an electrical device, and an energy storage device. In the battery cell, since the electrode terminals have at least one extension, the contact area between the electrode terminals and the air can be increased, thereby increasing the heat dissipation capacity of the electrode terminals. Since the first and second extensions are respectively used for connection to a busbar, when multiple battery cells are arranged along the thickness direction, the first and second extensions of adjacent battery cells are positioned opposite each other, which helps to shorten the connection path of the busbar. Since the electrode assembly is disposed in the housing space, the housing can protect the electrode assembly. Since the first housing wall is provided with the first and second electrode terminals, the electrode assembly can communicate with the outside world through the electrode terminals.

Claims

1. A battery cell, wherein, include: An outer casing having a receiving space, the outer casing including a first casing wall; The electrode assembly is at least partially disposed within the receiving space; An electrode terminal is disposed on the first housing wall. The electrode terminal has a terminal plate for connecting to a busbar. The terminal plate includes a main body and at least one extension connected to the main body. The at least one extension protrudes from the main body along a direction perpendicular to the wall thickness of the first housing wall.

2. The battery cell according to claim 1, wherein, Along the length of the first housing wall, the extension protrudes from the main body, and the length of the extension is greater than the length of the main body.

3. The battery cell according to claim 1 or 2, wherein, The battery cell includes at least two electrode terminals, wherein the at least two electrode terminals include a first electrode terminal and a second electrode terminal. The first electrode terminal includes a first main body and a first extension, and the second electrode terminal includes a second main body and a second extension. The first extension and the second extension extend along the length of the first housing wall toward the side that is closer to each other; or, The first extension and the second extension extend along the length of the first housing wall toward sides that are far apart from each other; or, The first extension and the second extension extend toward the same side along the length of the first housing wall.

4. The battery cell according to any one of claims 1 to 3, wherein, The terminal block includes multiple extensions.

5. The battery cell according to claim 4, wherein, The plurality of extensions extend from the same side of the main body along the length of the first housing wall.

6. The battery cell according to any one of claims 1 to 5, wherein, Along the width direction of the first housing wall, the ratio of the length of the extension to the length of the main body is in the range of 0.4 to 0.

8.

7. The battery cell according to any one of claims 3 to 6, wherein, The first electrode terminal includes a first terminal plate, and the second electrode terminal includes a second terminal plate. Along the width direction of the first housing wall, the ratio of the length of the first terminal plate and the second terminal plate to the length of the first housing wall is in the range of 0.6 to 0.

9.

8. The battery cell according to claim 1, wherein, The terminal block includes a first terminal block and a second terminal block, the first terminal block including a first extension and the second terminal block including a second extension. Along the length of the first housing wall, the ratio of the length of the first extension to the length of the first terminal plate is greater than or equal to 0.5 and less than 1; and / or, Along the length direction of the first housing wall, the ratio of the length of the second extension to the length of the second terminal plate is greater than or equal to 0.5 and less than 1.

9. The battery cell according to claim 1, wherein, The terminal board includes a first terminal board and a second terminal board. Along the length of the first housing wall, the ratio of the length of the first terminal plate to the length of the first housing wall is in the range of 0.2 to 0.7; and / or, Along the length of the first housing wall, the ratio of the length of the second terminal plate to the length of the first housing wall is in the range of 0.2 to 0.

7.

10. The battery cell according to claim 1, wherein, The terminal board includes a first terminal board and a second terminal board. The ratio of the length of the first terminal plate along the length direction of the first housing wall to the length of the first terminal plate along the width direction of the first housing wall is in the range of 3.5 to 10; and / or, The ratio of the length of the second terminal plate along the length direction of the first housing wall to the length of the second terminal plate along the width direction of the first housing wall is in the range of 3.5 to 10.

11. The battery cell according to any one of claims 3 to 10, wherein, The first electrode terminal includes a first terminal plate, at least a portion of which is disposed on the side of the first housing wall opposite to the receiving space. The second electrode terminal includes a second terminal plate, which is disposed on the side of the first housing wall opposite to the receiving space.

12. The battery cell according to any one of claims 3 to 11, wherein, The first electrode terminal includes a first terminal disk, at least a portion of which is disposed on the side of the first housing wall facing the receiving space. The second electrode terminal includes a second terminal disk, at least a portion of which is disposed on the side of the first housing wall facing the receiving space. Along the wall thickness direction of the first housing wall, the first terminal block is at least partially disposed between the second terminal block and the first housing wall; or, Along the wall thickness direction of the first housing wall, the second terminal plate is at least partially disposed between the first terminal plate and the first housing wall.

13. The battery cell according to claim 11, wherein, The first electrode terminal further includes a first terminal disk, at least a portion of which is disposed on the side of the first housing wall facing the receiving space. The second electrode terminal further includes a second terminal disk, at least a portion of which is disposed on the side of the first housing wall facing the receiving space. The first main body and the first terminal block are directly connected by a first connecting post; The second main body and the second terminal block are directly connected by a second connecting post.

14. The battery cell according to any one of claims 11 to 13, wherein, The electrode assembly includes a first electrode and a second electrode with opposite polarities. The first electrode terminal is electrically connected to the first electrode plate, and the second electrode terminal is electrically connected to the second electrode plate.

15. The battery cell according to any one of claims 11 to 14, wherein, Along the wall thickness direction of the first housing wall, the second terminal plate is at least partially disposed between the first terminal plate and the first housing wall, and the first terminal plate abuts against the second terminal plate.

16. The battery cell according to claim 15, wherein, The first terminal plate has a first protrusion, and the second terminal plate has a first recess. The first protrusion and the first recess overlap at least partially along the wall thickness direction of the first housing wall, and the first protrusion and the first recess cooperate with each other.

17. The battery cell according to claim 16, wherein, The battery cell further includes a first insulating member, which is fixed to a first electrode terminal. The second electrode terminal is at least partially disposed between the first insulating member and the first housing wall, and the first insulating member abuts against the second electrode terminal.

18. The battery cell according to claim 17, wherein, The first insulating part is disposed between the first electrode terminal and the first housing wall.

19. The battery cell according to claim 17 or 18, wherein, Along the wall thickness direction of the first housing wall, the first electrode terminal, the first insulating member, and the second electrode terminal partially overlap, and the portion of the first electrode terminal that overlaps with the first insulating member and the second electrode terminal abuts against the first insulating member.

20. The battery cell according to any one of claims 12 to 19, wherein, The first extension is connected to the first terminal block via a third connecting post. The first recess is disposed on the side of the second extension facing the first electrode terminal, and the first protrusion is disposed on the side of the first extension facing the second electrode terminal.

21. The battery cell according to any one of claims 16 to 19, wherein, The first recess includes a first stepped portion and a second stepped portion, wherein the second stepped portion is disposed on the side of the first stepped portion away from the first terminal plate; The first protrusion includes an extension provided on the first terminal plate. Along the wall thickness direction of the first housing wall, a portion of the second terminal plate is located between the extension and the first housing wall. The extension is at least partially accommodated in the step space formed by the first step. The first protrusion also includes a first cover portion provided by the first insulating member. Along the wall thickness direction of the first housing wall, a portion of the second terminal plate is located between the first cover portion and the first housing wall. The first cover portion is at least partially accommodated in the step space formed by the second step portion.

22. The battery cell according to claim 21, wherein, Along the wall thickness direction of the first housing wall, the surface of the first covering portion on the side opposite to the first housing wall does not extend beyond the surface of the first terminal plate on the side opposite to the housing wall; And / or, Along the wall thickness direction of the first housing wall, the surface of the first cover portion facing away from the first housing wall does not extend beyond the surface of the second terminal plate facing away from the first housing wall.

23. The battery cell according to any one of claims 11 to 22, wherein, Along the wall thickness direction of the first housing wall, the height difference between the surface of the first terminal plate facing away from the housing wall and the surface of the second terminal plate facing away from the first housing wall is greater than or equal to 0 and does not exceed 0.5 mm.

24. The battery cell according to claim 23, wherein, The battery cell also includes a second insulating element, which is at least partially located between the second electrode terminal and the first housing wall.

25. The battery cell according to claim 24, wherein, The first insulating component and the second insulating component are integrally molded.

26. The battery cell according to claim 24 or 25, wherein, A first recess and a second recess are formed in the first housing wall. At least a portion of the first insulating member and at least a portion of the second insulating member are located in the first recess and the second recess, respectively.

27. The battery cell according to claim 26, wherein, The first recess and the second recess form the same recess.

28. The battery cell according to any one of claims 16 to 19, wherein, The first recess is disposed on the side of the second extension facing the first electrode terminal, and the first protrusion is disposed on the side of the first main body facing the second electrode terminal.

29. The battery cell according to claim 28, wherein, The first electrode terminal also has a second recess, and the second electrode terminal also has a second protrusion. The second protrusion and the second recess at least partially overlap along the wall thickness direction of the first housing wall, and the second protrusion and the second recess cooperate with each other. The second recess is provided on the side of the first extension facing the second electrode terminal, and the second protrusion is provided on the side of the second main body facing the first electrode terminal.

30. The battery cell according to claim 29, wherein, The second recess includes a third step and a fourth step, wherein the fourth step is disposed on the side of the third step away from the second electrode terminal; The second protrusion includes a protrusion provided on the second battery terminal. Along the wall thickness direction of the first housing wall, a portion of the first electrode terminal is located between the protrusion and the first housing wall. The protrusion is at least partially accommodated in the step space formed by the third step. The second protrusion also includes a second cover provided by the second insulating member. Along the wall thickness direction of the first housing wall, a portion of the first electrode terminal is located between the second cover and the first housing wall. The second cover is at least partially accommodated in the step space formed by the fourth step portion.

31. The battery cell according to claim 1, wherein, The minimum cross-sectional area through which the current flows in the extension is S1, and the capacity of the battery cell is P. The ratio of S1 to P is in the range of 0.2 to 0.3, where the unit of capacity is Ah.

32. The battery cell according to claim 3, wherein, Along the length of the first housing wall, the first extension and the second extension are located between the first main body and the second main body; Along the width direction of the first housing wall, the first extension and the second extension have a first overlapping portion.

33. The battery cell according to claim 32, wherein, The material of the first main body and / or the second main body is different from the material of the first overlapping portion.

34. The battery cell according to claim 33, wherein, The length of the first shell wall along its longitudinal direction is L, and the length of the first overlapping portion along the longitudinal direction of the first shell wall is A, then A is in the range of 10% to 40% of L.

35. The battery cell according to any one of claims 32 to 34, wherein, The length of the first overlapping portion along the length direction of the first shell wall is A, and A is in the range of 3mm to 50mm.

36. The battery cell according to any one of claims 32 to 35, wherein, Along the length of the first housing wall, the first main body portion and the second main body portion have a second overlapping portion.

37. The battery cell according to claim 36, wherein, The dimension of the first housing wall along the width direction is W, and the length of the second overlapping portion along the width direction of the first housing wall is B, then B is in the range of 20% to 90% of W.

38. The battery cell according to any one of claims 3 to 37, wherein, Along the length direction and width direction of the first housing wall, the closest distance between the first electrode terminal and the second electrode terminal is greater than or equal to 0.3 mm.

39. The battery cell according to any one of claims 32 to 37, characterized in that, The first electrode terminal includes a first terminal plate, and the second electrode terminal includes a second terminal plate. Both the first terminal board and the second terminal board include a connection area for connection with a busbar, the busbar being used to electrically connect a plurality of the battery cells to each other, and the connection area is formed at least in the first overlapping portion.

40. The battery cell according to claim 39, wherein, The connection area is also formed in at least one of the first main body portion and the second main body portion.

41. The battery cell according to claim 39 or 40, wherein, If the area of ​​the connecting region of the first overlapping portion is SA, and the area of ​​the entire connecting region is S, then SA accounts for 50% to 100% of S.

42. The battery cell according to any one of claims 39 to 41, wherein, If the centerline position of the connection area formed in the first extension in the width direction of the first housing wall is offset by a distance B3 relative to the centerline position of the first housing wall in the width direction of the first housing wall, then B3 is in the range of 15% to 27% of W.

43. The battery cell according to any one of claims 1 to 10, wherein, The electrode terminals include a first electrode terminal and a second electrode terminal. The first electrode terminal has a first protrusion, and the second electrode terminal has a first recess. The first protrusion and the first recess at least partially overlap along the wall thickness direction of the first housing wall, and the first protrusion and the first recess cooperate with each other.

44. The battery cell according to any one of claims 1 to 10, wherein, The electrode terminals include a first electrode terminal and a second electrode terminal. The first electrode terminal includes a first terminal plate, at least a portion of which is disposed on the side of the first housing wall opposite to the receiving space. The second electrode terminal includes a second terminal plate, which is disposed on the side of the first housing wall opposite to the receiving space. Along the wall thickness direction of the first housing wall, the first terminal plate and the second terminal plate partially overlap, and the first terminal plate directly or indirectly abuts against the second terminal plate.

45. The battery cell according to any one of claims 1 to 10, wherein, The electrode terminals include a first electrode terminal and a second electrode terminal. The first electrode terminal includes a first terminal plate, at least a portion of which is disposed on the side of the first housing wall opposite to the receiving space. The first terminal plate includes a first main body portion and a first extension portion connected to each other. The second electrode terminal includes a second terminal plate disposed on the side of the first housing wall opposite to the receiving space. The second terminal plate includes a second main body portion and a second extension portion connected to each other. Along the length direction of the first housing wall, the first extension and the second extension are located between the first main body and the second main body, and the first extension and the second extension are arranged along the width direction of the first housing wall.

46. ​​The battery cell according to any one of claims 1 to 45, wherein, Along the wall thickness direction of the first housing wall, the portion where the first electrode terminal overlaps with the second electrode terminal is the overlapping region. The length of the overlapping region along the width direction of the first shell wall is W11, and the length of the first shell wall along the width direction is W. W11 falls within the range of 10% to 90% of W.

47. The battery cell according to claim 46, characterized in that, W11 ranges from 0.5mm to 50mm.

48. The battery cell according to any one of claims 46 to 47, characterized in that, The length of the overlapping area along the length direction of the first shell wall is L11, and L11 is in the range of 0.5mm to 6mm.

49. The battery cell according to any one of claims 3 to 48, characterized in that, Along the width direction of the first housing wall, the first extension is offset relative to the center position of the first main body. And / or, Along the width direction of the first housing wall, the second extension is offset relative to the center position of the second main body.

50. The battery cell according to any one of claims 1 to 49, wherein, The length of the first housing wall is less than or equal to 450 mm.

51. A battery, wherein, It includes a housing and at least two battery cells as described in any one of claims 1 to 50.

52. The battery according to claim 51, wherein, Each of the battery cells is arranged along the width direction of the first housing wall.

53. The battery according to claim 52, wherein, The first electrode terminal includes a first electrode terminal, which includes a first main body portion and a first extension portion connected to each other. The second electrode terminal includes a second main body portion and a second extension portion that are connected to each other. Along the length of the first housing wall, at least a portion of the first extension and at least a portion of the second extension are located between the first main body and the second main body. In adjacent battery cells, the first extension of one battery cell and the second extension of another battery cell are arranged along the width direction and are electrically connected by a busbar.

54. The battery according to claim 53, wherein, In the same battery cell, along the width direction of the first housing wall, the first extension and the second extension have a first overlapping portion. In adjacent battery cells, the first overlapping portion of one battery cell and the first overlapping portion of another battery cell are electrically connected through the busbar.

55. The battery according to claim 54, wherein, In adjacent battery cells, at least one of the first body portion of one battery cell and the second body portion of the other battery cell is electrically connected to the busbar.

56. The battery according to any one of claims 53 to 55, wherein, At least one wall of the housing has a boss, which is formed by the boss protruding from the housing wall in a direction away from the battery cell, and the boss forms a receiving portion on the side facing the battery cell. Along a direction perpendicular to the wall of the housing where the boss is formed, the projections of the first electrode terminal and the second electrode terminal do not exceed the projection of the boss, and the first electrode terminal and / or the second electrode terminal are at least partially accommodated in the accommodating portion.

57. An electrical appliance, wherein, The electrical device includes a plurality of battery cells according to any one of claims 1 to 50, or a battery according to any one of claims 51 to 56, wherein the battery cells or the battery supply power to the electrical device.

58. An energy storage device, wherein, The energy storage device includes a plurality of battery cells according to any one of claims 1 to 50, or a battery according to any one of claims 51 to 56, wherein the battery cells or the battery are used to store electrical energy and are capable of providing electrical energy.

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