Battery monomer, battery, power utilization device and energy storage device

Abstract

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

Description

Battery cell, battery, electric device and energy storage device TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, in particular to a battery cell, a battery, an electric device and an energy storage device. BACKGROUND

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

[0003] In the existing battery system, the battery includes an electrode assembly and an electrode terminal, and the electrode assembly realizes the function of power supply through the electrical connection of the tab and the electrode terminal. The heat at the welding position of the tab and the electrode terminal and the welding position of the internal structure of the electrode terminal is mainly transmitted to the outside through the electrode terminal. With the increasing demand of people for fast charging technology of the battery, the heat dissipation requirement of the electrode terminal is also increasing higher and higher. How to improve the heat dissipation effect of the electrode terminal is one of the research directions in the industry.

[0004] SUMMARY

[0005] Therefore, the present disclosure aims to provide a battery cell, a battery, an electric device and an energy storage device capable of improving the heat dissipation effect of the electrode terminal.

[0006] To achieve the above-mentioned purpose, the present disclosure adopts the following technical solutions.

[0007] The first aspect of the present disclosure provides a battery cell, comprising: a shell having a containing space, the shell comprising a first shell wall; an electrode assembly, at least partially disposed in the containing space; an electrode terminal disposed on the first shell wall, the electrode terminal having a terminal plate, the terminal plate being used for connecting with a busbar, the terminal plate comprising a main body portion and at least one extension portion connected with the main body portion, the at least one extension portion being protrudingly disposed on the main body portion along a wall thickness direction perpendicular to the first shell wall.

[0008] The protruding arrangement of the extension portion on the main body portion along the wall thickness direction perpendicular to the first shell wall can increase the contact area of the terminal plate with air, thereby increasing the contact area of the electrode terminal with air, increasing the heat dissipation area, improving the heat dissipation performance of the electrode terminal, and further improving the use performance of the battery cell.

[0009] In some embodiments, the extension portion is protrudingly disposed on the main body portion along the length direction of the first shell wall, and the length of the extension portion is greater than the length of the main body portion.

[0010] Therefore, the length of the extension part along the length direction of the first shell wall can be increased, the circumferential perimeter of the terminal plate can be increased, the contact area between the terminal plate and air can be increased, the heat dissipation area can be increased, the heat dissipation capacity of the electrode terminal can be improved, and the use performance of the battery monomer can be improved.

[0011] In some embodiments, the battery monomer includes at least two electrode terminals, the at least two electrode terminals include a first electrode terminal and a second electrode terminal, the first electrode terminal includes a first body part and a first extension part, the second electrode terminal includes a second body part and a second extension part, the first extension part and the second extension part extend towards one side of the first shell wall along the length direction of the first shell wall and approach each other; or the first extension part and the second extension part extend towards one side of the first shell wall along the length direction of the first shell wall and move away from each other; or the first extension part and the second extension part extend towards the same side of the first shell wall along the length direction of the first shell wall.

[0012] The electrode terminal is provided as at least two, the contact area between the electrode terminal and air can be increased, the heat dissipation capacity of the electrode terminal can be improved, and the use performance of the battery monomer can be improved. The extension direction of the first extension part and the second extension part has multiple, and the flexibility of the arrangement of the first extension part and the second extension part is improved.

[0013] In some embodiments, the terminal plate includes multiple extension parts.

[0014] One terminal plate can be provided as at least two extension parts, and the heat dissipation area of the terminal plate can be increased, the heat dissipation capacity of the electrode terminal can be improved, and the use performance of the battery monomer can be improved.

[0015] In some embodiments, the multiple extension parts extend from the body part towards the same side along the length direction of the first shell wall.

[0016] When the at least two extension parts are provided on one terminal plate, the extension direction of the extension parts can be the same or opposite, and the flexibility of the arrangement of the extension parts is improved.

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

[0018] Therefore, one body part can be provided with multiple extension parts, and the number of the extension parts can be increased. Under the same heat dissipation effect, the volume of the extension part can be reduced, the weight of the battery monomer can be reduced, and the production cost can be reduced. Along the width direction of the first shell wall, by setting the ratio of the length of the extension part to the length of the body part in the range of 0.4 to 0.8, the number of the extension parts and the size of the single extension part can be considered at the same time, and the heat dissipation performance is improved.

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

[0020] The width of the terminal plate in the width direction of the first housing wall can be increased, and the terminal plate can be provided with multiple extensions, thereby improving the heat dissipation capacity of the electrode terminal.

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

[0022] The size of the first extension in the length direction of the first housing wall can be increased, and / or the size of the second extension in the length direction of the first housing wall can be increased. In this way, the size of the extension is increased, the heat dissipation area of the extension is increased, and the heat dissipation performance of the electrode terminal can be effectively improved.

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

[0024] The size of the terminal plate in the length direction of the first housing wall can be increased, thereby increasing the heat dissipation area of the terminal plate and effectively improving the heat dissipation performance of the electrode terminal.

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

[0026] The terminal plate is provided in an elongated shape, which is conducive to increasing the heat dissipation area of the terminal plate and further improving the heat dissipation performance of the electrode terminal.

[0027] In some embodiments, the first electrode terminal includes a first terminal plate, at least a portion of the first terminal plate being disposed on a side of the first housing wall facing away from the accommodation space, and the second electrode terminal includes a second terminal plate, the second terminal plate being disposed on a side of the first housing wall facing away from the accommodation space.

[0028] In this way, connection with a busbar or the like can be achieved, and electrical connection with an external structure can be achieved.

[0029] In some embodiments, the first electrode terminal includes a first terminal plate, at least a portion of the first terminal plate being disposed on a side of the first housing wall facing away from the accommodation space, and the second electrode terminal includes a second terminal plate, the second terminal plate being disposed on a side of the first housing wall facing away from the accommodation space.

[0030] Since the electrode terminal includes a terminal plate disposed outside the housing of the battery cell and a terminal disc disposed inside the housing, the electrode terminal can be easily connected to the tab of the electrode assembly through the terminal disc, and the heat dissipation, the support of the first housing wall, and the connection strength with the busbar can be improved by designing the terminal plate to be large, and the shape design freedom of the terminal plate and the terminal disc is high. Moreover, the first housing wall is clamped by the terminal plate and the terminal disc from both the inside and the outside of the housing, and the bending strength of the first housing wall can be improved.

[0031] In some embodiments, the first electrode terminal further includes a first terminal disc, at least a portion of the first terminal disc being disposed on a side of the first housing wall facing the accommodation space, and the second electrode terminal further includes a second terminal disc, at least a portion of the second terminal disc being disposed on a side of the first housing wall facing the accommodation space, and the first main body portion and the first terminal disc are directly connected by a first connecting column, and the second main body portion and the second terminal disc are directly connected by a second connecting column.

[0032] Since the terminal plate and the terminal disc can be connected together by the connecting column, the electrode terminal can function to draw current from the electrode assembly. Moreover, the connecting column is disposed on the main body portion, and thus the electrode terminal can be reliably fixed to the first housing wall.

[0033] In some embodiments, the electrode assembly includes first and second polar plates having opposite polarities, the first electrode terminal is electrically connected to the first polar plate, and the second electrode terminal is electrically connected to the second polar plate.

[0034] Thus, the electrode terminals with opposite polarities can be arranged on the first shell wall of the battery monomer, so as to facilitate reducing the space occupied by the busbar and the like, and facilitating arranging other structural members such as the heat exchange member on other shell walls of the battery monomer, and facilitating improving the volume utilization rate of the battery.

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

[0036] Thus, the bending strength of the electrode terminals and the first shell wall can be further improved by arranging the first terminal disc and the second terminal disc to be engaged with each other; and the first terminal disc and the second terminal disc can be electrically connected with each other, so as to facilitate simplifying the connection structure when the two electrode terminals have the same polarity.

[0037] In some embodiments, the first terminal plate has a first protruding part, the second terminal plate has a first recessed part, the first protruding part at least partially overlaps with the first recessed part along the wall thickness direction of the first shell wall, and the first protruding part and the first recessed part are matched with each other.

[0038] Thus, by matching the first protruding part with the first recessed part, the support and fixation of the first electrode terminal to the second electrode terminal can be facilitated, the bending strength of the second electrode terminal can be improved, and the processing can be facilitated; by arranging the first protruding part in the first recessed part, the space occupied by the first protruding part can be reduced, and the space utilization rate can be improved.

[0039] In some embodiments, the battery monomer further comprises a first insulating member, the first insulating member is fixed with the first electrode terminal, the second electrode terminal is at least partially arranged between the first insulating member and the first shell wall, and the first insulating member abuts against the second electrode terminal.

[0040] Thus, the first electrode terminal and the second electrode terminal can be insulated from each other, so that even if the first electrode terminal and the second electrode terminal have opposite polarities, the bending strength of the second electrode terminal can be improved by abutting the first insulating member against the second electrode terminal. Moreover, when the first insulating member has a suitable strength, the bending deformation of the second electrode terminal can be limited by the first insulating member.

[0041] In some embodiments, the first insulating member is partially arranged between the first electrode terminal and the first shell wall.

[0042] Thus, the first electrode terminal and the first shell wall can be insulated from each other.

[0043] In some embodiments, the first electrode terminal, the first insulating member and the second electrode terminal partially overlap in the wall thickness direction of the first housing wall, 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] In this way, the bending deformation of the second electrode terminal can be jointly limited 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, so that the support and fixation of the first electrode terminal to the second electrode terminal can be further strengthened, and the bending deformation resistance of each electrode terminal can be improved; the strength of the region of the first housing wall where the electrode terminals are arranged can also be strengthened; in addition, the polarity of the electrode terminals has high freedom.

[0045] In some embodiments, the first extension portion is connected to the first terminal plate through a third connecting column, the first recessed portion is arranged on the side of the second extension portion facing the first electrode terminal, and the first protruding portion is arranged on the side of the first extension portion facing the second electrode terminal.

[0046] In this way, the first recessed portion arranged on the second extension portion can be fixed between the first protruding portion arranged on the first main body portion and the first housing wall by abutting against the first protruding portion, so that the second extension portion can be prevented from being bent away from the first housing wall to a certain extent due to the long extension, and the bending strength of the second extension portion and the entire second electrode terminal is improved. Even if the electrode terminal is subjected to a pulling force from the bus member or the like, the electrode terminal is not easy to bend or break, and the connection reliability of the bus member and the electrode terminal is improved.

[0047] In some embodiments, the first recessed portion includes a first stepped portion and a second stepped portion, the second stepped portion is arranged on the side of the first stepped portion away from the first terminal plate; the first protruding portion includes a protruding portion arranged on the first terminal plate, a portion of the second terminal plate is located between the protruding portion and the first housing wall in the wall thickness direction of the first housing wall, and the protruding portion is at least partially accommodated in the stepped space formed by the first stepped portion; the first protruding portion further includes a first covering portion arranged on the first insulating member, a portion of the second terminal plate is located between the first covering portion and the first housing wall in the wall thickness direction of the first housing wall, and the first covering portion is at least partially accommodated in the stepped space formed by the second stepped portion.

[0048] Thus, the extension portion and the first step portion can be matched to limit the bending deformation of the second electrode terminal, and the extension portion is at least partially accommodated in the first step portion to reduce the space occupied by the extension portion and improve the space utilization. By arranging the first covering portion, the creepage distance on the surface of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, the first covering portion is accommodated in the step portion, so that the first covering portion does not occupy additional space, thereby improving the space utilization.

[0049] In some embodiments, a surface of a side of the first covering portion away from the first shell wall does not exceed a surface of a side of the first terminal plate away from the shell wall in a wall thickness direction of the first shell wall; and / or a surface of a side of the first covering portion away from the first shell wall does not exceed a surface of a side of the second terminal plate away from the first shell wall in the wall thickness direction of the first shell wall.

[0050] Since the surface of the side of the first covering portion away from the first shell wall does not exceed the surface of the side of the first terminal plate and / or the second terminal plate away from the first shell wall, the first covering portion does not protrude from the first terminal plate and / or the second terminal plate, thereby reducing the size of the battery monomer and even the battery pack in the wall thickness direction of the first shell wall; and the first covering portion is prevented from interfering with the busbar, thereby facilitating reliable connection of the busbar and the first terminal plate and the second terminal plate.

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

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

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

[0054] Thus, the second electrode terminal can be insulated from the shell of the battery monomer, and thus can be applied to not only the design scheme in which the shell is electrified, but also the design scheme in which the shell is not electrified.

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

[0056] Thus, the number of components can be reduced, and the assembly steps can be simplified.

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

[0058] By sinking at least a portion of the first insulating member and at least a portion of the second insulating member into the recesses on the first housing wall, the installation strength of the insulating members relative to the first housing wall is improved, the possibility of displacement of the insulating members along the surface of the first housing wall is reduced, and the positioning of the insulating members and the first housing wall relative to each other during assembly is facilitated.

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

[0060] In this way, the number of components can be reduced and the assembly steps can be simplified.

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

[0062] In this way, the first recess provided on the second extension portion can be fixed between the first protrusion provided on the first main body portion and the first housing wall by abutting against the first protrusion, thereby preventing the second extension portion from being bent away from the first housing wall to some extent due to the longer extension, and improving the bending strength of the second extension portion and the entire second electrode terminal. Even if the electrode terminal is subjected to a pulling force from the bus member or the like, the electrode terminal is not easily bent or broken, and the connection reliability of the bus member and the electrode terminal is improved.

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

[0064] In this way, the second electrode terminal is facilitated to support and fix the first electrode terminal by matching the second protrusion with the second recess, the bending strength of the first electrode terminal is improved, and the second protrusion occupies less space, thereby improving the space utilization.

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

[0066] In this way, the cooperation of the protruding portion and the third step portion can realize the limitation of the bending deformation of the first electrode terminal, and further at least partially accommodate the protruding portion in the third step portion to reduce the space occupied by the protruding portion and improve the space utilization. By providing the second covering portion, the creepage distance on the surface of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, by accommodating the second covering portion in the step portion, the second covering portion does not occupy additional space, thereby improving the space utilization.

[0067] In some embodiments, the minimum cross-sectional area for current passing in the extension portion is S1, and the capacity of the battery monomer is P, and 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 in a suitable range, so that the extension portion has a suitable overcurrent capacity.

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

[0070] In this way, by arranging the first extension portion and the second extension portion to overlap in the width direction of the first shell wall, the bending strength of the region in the first shell wall where the electrode terminals are arranged can be improved by 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 conducive to the utilization of the non-electrode terminal arrangement region of the first shell wall, and further conducive to 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] Therefore, the material of the first body part and the second body part can be set according to the situation, which helps to reduce current loss, improve heat dissipation capacity, etc.

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

[0074] Therefore, the first overlapping part is set to be longer, which helps to improve the strength of the electrode terminal setting area in the first shell wall and even the entire first shell wall.

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

[0076] Therefore, the first overlapping part is set to be longer, which helps to improve the strength of the electrode terminal setting area in the first shell wall and even the entire first shell wall.

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

[0078] Therefore, since there are overlapping parts in the length direction of the first shell wall and the width direction of the first shell wall, the first electrode terminal and the second electrode terminal can be arranged compactly in the length direction of the first shell wall and the width direction of the first shell wall, and the bending strength of the first shell wall can be further improved.

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

[0080] Therefore, the length of the second overlapping area along the width direction of the first shell wall is set to be longer, which helps to improve the strength of the first shell wall.

[0081] In some embodiments, the shortest distance between the first electrode terminal and the second electrode terminal along the length direction of the first shell wall and the width direction of the first shell wall is greater than or equal to 0.3mm. Therefore, the possibility of short-circuiting between the first electrode terminal and the second electrode terminal can be reduced.

[0082] In some embodiments, the first electrode terminal comprises a first terminal plate, and the second electrode terminal comprises a second terminal plate, the first terminal plate and the second terminal plate each comprise a connecting area for connecting with a busbar, the busbar being used to electrically connect a plurality of the battery monomers with each other, and the connecting area is formed at least in the first overlapping portion.

[0083] In this way, the busbar is connected with the part of the first electrode terminal and the second electrode terminal where the first overlapping portion is formed, and since this part 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 easy to be bent and deformed, and are even less likely to be broken due to bending and deformation.

[0084] In some embodiments, the connecting area is also formed in at least any one of the first main part and the second main part.

[0085] In this way, the connection strength between the electrode terminal and the busbar can be further enhanced, the bending stress caused by the busbar can be further dispersed, and the deformation resistance of the electrode terminal and the first housing wall can be further improved.

[0086] In some embodiments, the area of the connecting area of the first overlapping portion is SA, and the total area of all the connecting areas is S, and SA accounts for 50% to 100% of S.

[0087] In this way, the connecting area can be arranged in the area of the non-extended part in addition to the extended part, the arrangement flexibility of the connecting area is strong, which helps to increase the area of the connecting area, improve the connection strength, and increase the overflow area.

[0088] In some embodiments, the center line position of the connecting area formed in the first extended part in the width direction of the first housing wall is offset from the center line position of the first housing wall in the width direction of the first housing wall by a distance B3, and B3 is in the range of 15% to 27% of W.

[0089] By setting B3 to be not less than 15% of W, the first extended part is arranged to have a sufficient distance from the center, so as to help the first extended part and the second extended part to be spaced apart by a sufficient safety distance; and by setting B3 to be not greater than 27% of W, the first extended part can be arranged to have a certain distance from the edge of the first housing wall.

[0090] In some embodiments, the electrode terminal comprises a first electrode terminal and a second electrode terminal, the first electrode terminal is provided with a first protruding part, the second electrode terminal is provided with a first recessed part, the first protruding part and the first recessed part at least partially overlap in the thickness direction of the first housing wall, and the first protruding part and the first recessed part are matched with each other.

[0091] Thus, by matching the first protruding part and the first recessed part, the support and fixation of the first electrode terminal to the second electrode terminal are facilitated, the bending strength of the second electrode terminal is improved, and the processing is facilitated; by arranging the first protruding part in the first recessed part, the space occupied by the first protruding part is reduced, and the space utilization is improved.

[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 part of the first terminal plate is arranged on the side of the first shell wall away from the accommodation space, the second electrode terminal includes a second terminal plate, the second terminal plate is arranged on the side of the first shell wall away from the accommodation space, the first terminal plate and the second terminal plate partially overlap along the thickness direction of the first shell wall, and the first terminal plate directly or indirectly abuts against the second terminal plate.

[0093] Thus, the bending strength of the electrode terminal and the first shell wall can be further improved by arranging the first terminal plate and the second terminal plate to be engaged with each other; and the first terminal plate and the second terminal plate can be electrically connected with each other, which facilitates the connection structure when the two electrode terminals have the same polarity.

[0094] 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 part of the first terminal plate is arranged on the side of the first shell wall away from the accommodation space, the first terminal plate includes a first main body part and a first extension part connected with each other, the second electrode terminal includes a second terminal plate, the second terminal plate is arranged on the side of the first shell wall away from the accommodation space, the second terminal plate includes a second main body part and a second extension part connected with each other, the first extension part and the second extension part are located between the first main body part and the second main body part along the length direction of the first shell wall, and the first extension part and the second extension part are arranged along the width direction of the first shell wall.

[0095] The heat dissipation, the support to the first shell wall, and the connection strength to the busbar can be improved by designing the terminal plates to be larger, and the shape design freedom of each terminal plate is higher.

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

[0097] Thus, the first housing wall along the width direction thereof can be fully utilized, 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 improved, and the strength of the first housing wall around the electrode terminal can be enhanced.

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

[0099] Thus, the size of the overlapping region along the width direction of the first housing wall can be determined according to the size of the first housing wall along the width direction thereof, and by setting the size of the overlapping region along the width direction of the first housing wall to be larger, the support 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 enhanced.

[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 0.5mm to 6mm.

[0101] Thus, by setting the length of the overlapping region along the length direction of the first housing wall to be smaller, the fitting strength between the protruding portion and the recessed portion can be improved, and the space utilization can be improved.

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

[0103] Thus, the first extension portion and the second extension portion can be arranged along the width direction of the first housing wall by fully utilizing the size of the first housing wall along the width direction thereof, and the first electrode terminal and the second electrode terminal can be compactly arranged.

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

[0105] Thus, the electrode terminal can be arranged by fully utilizing the narrow side wall of the long strip-shaped battery monomer, the flexibility of the battery monomer group is improved, and the heat dissipation of the large area is facilitated.

[0106] The second aspect of the present disclosure provides a battery, comprising: a box body and at least two battery monomers of the first aspect.

[0107] Since the battery adopts the battery monomer as described above, the heat dissipation capacity of the electrode terminal in the battery monomer is improved, and the use performance of the battery is improved.

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

[0109] Thus, the volume utilization of the battery is improved.

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

[0111] Since the bus bar is connected to the first extension portion and the second extension portion located between the first main body portion and the second main body portion, the bending resistance of the connection portion is strong, thus the first electrode terminal, the second electrode terminal and the first housing wall are not easily bent and deformed or broken, thus the use reliability of the battery is improved.

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

[0113] Thus, the bus bar is connected to the portion of the first electrode terminal and the second electrode terminal where the first overlapping portion is formed, since the bending resistance of the portion is strong, even if the bus bar 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 and deformed, and are even less likely to be broken due to bending deformation, thus the use reliability of the battery is improved.

[0114] In some embodiments, at least one of the box walls of the box has a boss formed by protruding from the box wall toward a direction away from the battery cell, the boss forms a receiving portion on a side toward the battery cell, along a direction perpendicular to the box wall where the boss is formed, the projection of the first electrode terminal and the second electrode terminal does 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, the height of the case at the position of the first electrode terminal, the second electrode terminal and the busbar can be increased only, so that the size of the battery can be inhibited, and the volume utilization of the battery can be improved.

[0116] A third aspect of the present disclosure provides a power consuming device, comprising a plurality of the battery cell provided in the first aspect or the battery provided in the second aspect, and the battery cell or the battery supplies power to the power consuming device.

[0117] Therefore, the power consuming device with the battery cell or the battery with high heat dissipation capacity of the electrode terminal can be provided, and the use performance of the power consuming device can be improved.

[0118] A fourth aspect of the present disclosure provides an energy storage device, comprising a plurality of the battery cell provided in the first aspect or the battery provided in the second aspect, and the battery cell or the battery is used for storing and providing electric energy.

[0119] Therefore, the energy storage device with the battery cell or the battery with high heat dissipation capacity of the electrode terminal can be provided, and the use performance of the energy storage device can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0120] FIG. 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present disclosure;

[0121] FIG. 2 is a structural schematic diagram of an energy storage device provided by an embodiment of the present disclosure;

[0122] FIG. 3 is a perspective exploded schematic diagram of a battery provided by an embodiment of the present disclosure;

[0123] FIG. 4 is a perspective exploded schematic diagram of a battery cell provided by an embodiment of the present disclosure;

[0124] FIG. 5 is a top view schematic diagram of the battery cell provided by an embodiment of the present disclosure;

[0125] FIG. 6 is a top view schematic diagram of the battery cell provided by another embodiment of the present disclosure;

[0126] FIG. 7 is a top view schematic diagram of the battery cell provided by still another embodiment of the present disclosure;

[0127] FIG. 8 is an exploded schematic diagram of an electrode terminal provided by still another embodiment of the present disclosure;

[0128] FIG. 9 is a structural schematic diagram of a plurality of battery cells provided by an embodiment of the present disclosure;

[0129] FIG. 10 is a front view schematic diagram of the plurality of battery cells provided by an embodiment of the present disclosure;

[0130] FIG. 11 is a sectional view along A-A in FIG. 10 provided by an embodiment of the present disclosure;

[0131] Fig. 12 is a top view of a battery cell according to yet another embodiment of the present disclosure;

[0132] Fig. 13 is a cross-sectional view along B-B of Fig. 12;

[0133] Fig. 14 is an enlarged view of a portion C of Fig. 13;

[0134] Fig. 15 is a schematic view of a structure of a plurality of battery cells according to another embodiment of the present disclosure;

[0135] Fig. 16 is an exploded view of a battery cell according to another embodiment of the present disclosure;

[0136] Fig. 17 is a cross-sectional view of a battery with a boss according to an embodiment of the present disclosure;

[0137] Fig. 18 is an enlarged view of a portion C1 of Fig. 13;

[0138] Fig. 19 is a cross-sectional view along D-D of Fig. 12;

[0139] Fig. 20 is an enlarged view of a portion D1 of Fig. 19;

[0140] Fig. 21 is a top view of a battery cell according to yet another embodiment of the present disclosure.

[0141] Legend of Reference Numerals 1000 vehicle; 2000 energy storage device; 100 battery; 200 controller; 300 motor; 400 electrical compartment; 10 battery cell; 20 case; 20A upper case; 20B lower case; 1 housing; 11 first housing wall; 12 accommodation space; 131 first recess; 132 second recess; 2 busbar; 3 electrode terminal; 31 first electrode terminal; 311 first terminal disc; 312 first connecting column; 314 first protrusion; 32 second electrode terminal; 321 second terminal disc; 322 second connecting column; 325 third connecting column; 315 first recessed portion; 3151 first step portion; 3152 second step portion; 316 second recessed portion; 3161 third step portion; 3162 fourth step portion; 317 second protrusion; 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 tab; 72 second tab; 81 first insulating member; 82 second insulating member; 811 first cover portion; 812 second cover portion; 91 first overlapping portion; 93 connecting region; 111a boss; 111b accommodation portion; X length direction of first housing wall; Y width direction of first housing wall; Z wall thickness direction of first housing wall. DETAILED DESCRIPTION

[0142] It should be noted that the embodiments and technical features in the present disclosure can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation of the purpose of the present disclosure, and should not be regarded as an improper limitation of the present 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 present disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure; the terms "comprising" and "having," and any variations thereof, as used herein are intended to cover a non-exclusive inclusion.

[0144] In the description of the present disclosure, the technical terms "first", "second", "third", "fourth" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0145] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The occurrence of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is 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 the present disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents the "or" relationship between the front and rear associated objects.

[0147] In the description of the embodiments of the present disclosure, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed, operated or used in a specific orientation, and therefore cannot be understood as a limitation of the embodiments of the present disclosure.

[0148] In the description of the present disclosure, unless explicitly defined and limited otherwise, the technical terms "mount", "connect", "connect", "fix", and other terms should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0149] In the description of the present disclosure, unless explicitly defined and limited otherwise, the technical term "contact" should be understood broadly, which can be direct contact or contact through an intermediate medium layer, and can be contact between two contacting objects without interaction force, or contact between two contacting objects with interaction force.

[0150] In the description of the embodiments of the present disclosure, unless explicitly defined and limited otherwise, the technical terms "parallel" and "vertical" allow a certain degree of tolerance and / or error, including approximately parallel and approximately vertical.

[0151] Next, the present disclosure will be described in detail.

[0152] In the existing battery system, the battery includes an electrode assembly and an electrode terminal, and the electrode assembly realizes the power supply function through the electrical connection of the tab and the electrode terminal. The heat at the welding position of the tab and the electrode terminal and the welding position of the internal structure of the electrode terminal is mainly transmitted to the outside through the electrode terminal. With the increasing demand for fast charging technology of the battery, the heat dissipation requirement of the electrode terminal is also increasing. How to improve the heat dissipation effect of the electrode terminal is one of the research topics in the industry.

[0153] In the related art, there is a scheme of specially setting a cooling structure for the electrode terminal, but it has the disadvantages of large space occupation and complex structure. Therefore, it is desirable to provide a battery monomer that can improve the heat dissipation capacity of the electrode terminal and as far as possible without changing the original battery outer contour size. After research, the electrode terminal can be partially protruding, the circumferential length of the electrode terminal can be increased, the contact area between the electrode terminal and the air can be increased, the heat dissipation area can be increased, the heat dissipation capacity of the electrode terminal can be improved, and the use performance of the battery monomer can be improved.

[0154] Based on such design concept, the inventor of the present disclosure designs a battery monomer, which comprises: a shell having an accommodation space, the shell comprising a first shell wall; an electrode assembly arranged in the accommodation space; and an electrode terminal arranged on the first shell wall, the electrode terminal having a terminal plate for connecting with a busbar, the terminal plate comprising a main body portion and at least one extension portion connected with the main body portion, the at least one extension portion being protrudingly arranged on the main body portion along a direction perpendicular to the wall thickness of the first shell wall.

[0155] The protruding arrangement of the extension portion on the main body portion along the direction perpendicular to the wall thickness of the first shell wall can increase the contact area of the terminal plate with air, thereby increasing the contact area of the electrode terminal with air, increasing the heat dissipation area, improving the heat dissipation performance of the electrode terminal, and further improving the use performance of the battery monomer. The battery monomer provided by the embodiment of the present disclosure can be used in, but is not limited to, an electric device such as an energy storage device, a vehicle, a ship or an aircraft.

[0156] The battery monomer provided by the embodiment of the present disclosure can also be used as a battery (also referred to as a battery pack) in groups. The battery can also be used in, but is not limited to, an electric device such as an energy storage device, a vehicle, a ship or an aircraft.

[0157] The embodiment of the present disclosure further provides an electric device comprising the battery monomer or the battery, which can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0158] The embodiment of the present disclosure further provides an energy storage device comprising the battery monomer or the battery, which comprises an energy storage container, an energy storage cabinet, etc.

[0159] For the convenience of description, the electric device of the embodiment of the present disclosure is taken as a vehicle 1000 for example. The following will be described with reference to the accompanying drawings.

[0160] FIG. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present disclosure. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. As shown in FIG. 1, the vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0161] In some embodiments of the present disclosure, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0162] FIG. 2 is a structural schematic diagram of an energy storage device 2000 according to some embodiments of the present disclosure. The energy storage device 2000 can be an energy storage container or an energy storage cabinet, etc. As shown in FIG. 2, the energy storage device 2000 can include the battery 100 and a control unit 400, and the control unit 400 is used to control the charging and discharging of the battery 100 to ensure normal operation of the battery 100, for example, to monitor environmental temperature, humidity, and other parameters.

[0163] FIG. 3 is a structural exploded schematic diagram of the battery according to an embodiment of the present disclosure. As shown in FIG. 3, the battery 100 includes a box body 20, which can be divided into an upper box body 20A and a lower box body 20B, and the upper box body 20A and the lower box body 20B are opposite to each other to form an arrangement space of battery cells 10 between them.

[0164] In the battery 100, the battery cells 10 can be multiple, and the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 10 are connected in series and in parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed connection, and the whole formed by the multiple battery cells 10 is placed in the arrangement space defined by the upper box body 20A and the lower box body 20B. Of course, the battery 100 can also be that the multiple battery cells 10 are first connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the arrangement space defined by the upper box body 20A and the lower box body 20B. The battery 100 can further include other structures, for example, the battery 100 can further include a current combiner (not shown in FIG. 3) for realizing electrical connection between the multiple battery cells 10.

[0165] In the embodiments of the present disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be used continuously by activating the active material through charging after the battery cell is discharged.

[0166] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited thereto.

[0167] In the following, some embodiments of the present disclosure will be described in detail in conjunction with FIGS. 4 to 21.

[0168] FIG. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present disclosure; FIG. 2 is a structural schematic diagram of an energy storage device according to an embodiment of the present disclosure; FIG. 3 is a perspective exploded schematic diagram of a battery according to an embodiment of the present disclosure; FIG. 4 is a perspective exploded schematic diagram of a battery cell according to an embodiment of the present disclosure; FIG. 5 is a top view schematic diagram of a battery cell according to an embodiment of the present disclosure; FIG. 6 is a top view schematic diagram of a battery cell according to another embodiment of the present disclosure; FIG. 7 is a top view schematic diagram of a battery cell according to still another embodiment of the present disclosure; FIG. 8 is an exploded schematic diagram of an electrode terminal according to still another embodiment of the present disclosure; FIG. 9 is a structural schematic diagram of a plurality of battery cells grouped according to an embodiment of the present disclosure; FIG. 10 is a front view schematic diagram of a plurality of battery cells grouped according to an embodiment of the present disclosure; FIG. 11 is a cross-sectional view along A-A in FIG. 10 according to an embodiment of the present disclosure; FIG. 12 is a top view schematic diagram of a battery cell according to still another embodiment of the present disclosure; FIG. 13 is a cross-sectional view along B-B in FIG. 12 according to an embodiment of the present disclosure; FIG. 14 is a partial enlarged schematic diagram of a C portion in FIG. 13 according to an embodiment of the present disclosure; FIG. 15 is a structural schematic diagram of a plurality of battery cells grouped according to still another embodiment of the present disclosure; FIG. 16 is a perspective exploded schematic diagram of a battery cell according to another embodiment of the present disclosure; FIG. 17 is a cross-sectional schematic diagram of a battery with a boss according to an embodiment of the present disclosure; FIG. 18 is a partial enlarged schematic diagram of a C1 portion in FIG. 13 according to an embodiment of the present disclosure; FIG. 19 is a cross-sectional schematic diagram along D-D in FIG. 12 according to an embodiment of the present disclosure; FIG. 20 is a partial enlarged schematic diagram of a D1 portion in FIG. 19 according to an embodiment of the present disclosure; and FIG. 21 is a top view schematic diagram of a battery cell according to still another embodiment of the present disclosure.

[0169] In the description of the embodiments of the present disclosure, the direction of arrow X represents the length direction of the first shell wall and the length direction of the battery cell, the direction of arrow Y represents the width direction of the first shell wall and the thickness direction of the battery cell, and the direction of arrow Z represents the wall thickness direction of the first shell wall and the height direction of the battery cell.

[0170] A first aspect of the present disclosure provides a battery cell 10. The battery cell 10 comprises: a casing 1 having a receiving space 12, the casing 1 comprising a first casing wall 11; an electrode assembly 7 at least partially disposed in the receiving space 12; an electrode terminal 3 disposed on the first casing wall 11, the electrode terminal 3 having a terminal plate 4 for connecting with a busbar 2, the terminal plate 4 comprising a main body portion 5 and at least one extension portion 6 connected with the main body portion 5, the at least one extension portion 6 being protrudingly disposed on the main body portion 5 along a direction Z perpendicular to a thickness direction of the first casing wall.

[0171] As shown in FIG. 4, the battery cell 10 comprises a casing 1 having a plurality of casing walls, for the convenience of description, one of the casing walls is named as a first casing wall 11. The battery cell 10 further comprises an electrode assembly 7 located in a receiving space 12 surrounded by the plurality of casing walls.

[0172] In some embodiments, as shown in FIG. 4, the battery cell 10 comprises an electrode assembly 7. The electrode assembly 7 comprises a positive electrode sheet, a negative electrode sheet, and a separator. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode sheet and the negative electrode sheet, which can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through. In the embodiment shown in FIG. 4, as the electrode assembly 7, two laminated jelly rolls formed by laminating and winding the positive electrode sheet, the negative electrode sheet, and the separator are shown, but the electrode assembly 7 is not limited to the winding type shown in FIG. 4, for example, it can also be a laminated type or other structural forms.

[0173] The electrode assembly 7 is provided with tabs that can conduct current out of the electrode assembly 7. The tabs include positive tabs and negative tabs. In the specific embodiment shown in FIG. 4, the electrode assembly 7 is shown to have a first tab 71 and a second tab 72, which are disposed on one side of the electrode assembly 7 along the thickness direction Z of the first casing wall and near the two end portions of the electrode assembly 7 along the length direction X of the first casing wall, respectively. 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 portion of the electrode assembly 7 along the length direction X of the first casing wall.

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

[0175] In some embodiments, the outer shell can be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell serves to protect the electrode assembly, and a sealing bag is further included between the outer shell and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member 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, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, and the like. In the embodiments shown in FIGS. 4-20, a square battery cell is taken as an example for illustration.

[0176] In some embodiments, as shown in FIG. 4, the outer shell 1 includes a plurality of shell walls, and a portion of the shell walls enclose a space with an opening, which can be closed by another shell wall (e.g., the first shell wall 11) to form a containing space 12 for containing the electrode assembly 7 and the electrolyte and the like. The outer shell 1 can be provided with one or more openings. The shell wall (e.g., the first shell wall 11) that closes the opening can also be configured as a top cover.

[0177] As shown in FIGS. 4-7, the battery cell 10 further includes an electrode terminal 3, which is provided on the first shell wall 11, and the electrode terminal 3 is connected with the electrode assembly 7 to lead the current in or out of the electrode assembly 7. The electrode terminal 3 has a terminal plate 4 for connecting with the busbar 2, which can realize the electrical connection between the battery cells, and the terminal plate 4 includes a main body portion 5 and at least one extension portion 6, the main body portion 5 is connected with each extension portion 6, and the at least one extension portion 6 protrudes from the main body portion 5 along the direction Z perpendicular to the thickness of the first shell wall.

[0178] In some embodiments, the electrode terminal 3 can be directly connected with the tab or indirectly connected with the tab through an adapter member. For the convenience of illustration, in the embodiments of the present disclosure, the shell wall where the electrode terminal 3 is located is referred to as the first shell wall 11.

[0179] Optionally, the electrode terminal 3 can be one, two, three, or four, etc. When the electrode terminal 3 is one, the electrode terminal 3 can be a positive electrode, and the outer shell 1 is a negative electrode. The electrode terminal 3 can be located at the center of the first shell wall 11, or at one end of the first shell wall 11 along the length direction X of the first shell wall, or at one end of the first shell wall 11 along the width direction Y of the first shell wall, and there is no special limitation on the specific position of the electrode terminal 3 on the first shell wall 11, as long as the electrical connection between the electrode terminal 3 and the tab can be realized. In one specific embodiment, as shown in FIG. 5, the electrode terminal 3 is located at one end of the first shell wall 11 along the length direction X of the first shell wall.

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

[0181] As shown in Figs. 5 to 7, in some embodiments, the busbar 2 can be arranged on the surface of the terminal plate 4, as shown in the shaded part of Figs. 5 to 7 as the busbar welding area. Firstly, the tab can play a role in connecting the battery monomer 10, secondly, the tab can also undertake the role of current distribution, in addition, the tab also undertakes the role of temperature detection and conduction, the tab can enhance the heat dissipation capacity of the battery monomer 10 through a reasonable design of the heat dissipation scheme, thereby reducing the temperature of the battery monomer 10 and improving the use performance of the battery monomer 10.

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

[0183] As shown in Fig. 4, when the outer surface of the first shell wall 11 is a planar structure, the plane formed by the length direction X of the first shell wall and the width direction Y of the first shell wall is parallel to the outer surface of the first shell wall 11, sometimes the width direction Y of the first shell wall is also the thickness direction of the battery monomer 10, of course, the outer surface of the first shell wall 11 can also be a curved surface.

[0184] Optionally, the extension part 6 can be one or more. Taking the orientation shown in Fig. 5 as an example, the extension part 6 can protrude from the main body part 5 along one side or the other side of the length direction X of the first shell wall relative to the main body part 5; the extension part 6 can also protrude from the main body part 5 along one side or the other side of the width direction Y of the first shell wall relative to the main body part 5; when there are multiple extension parts 6, part of the extension parts 6 can protrude from the main body part 5 along one side or the other side of the length direction X of the first shell wall relative to the main body part 5, and the other part of the extension parts 6 can protrude from the main body part 5 along one side or the other side relative to the main body part 5. Of course, the extension part 6 can also extend relative to the main body part 5 in other directions, for example, the extension part 6 can protrude relative to the main body part 5 along the intermediate direction (such as the upper left direction in Fig. 5) of the length direction X of the first shell wall and the width direction Y of the first shell wall. The number, shape and size of the extension part 6 and the main body part 5 are not specifically limited. The extension directions of the multiple extension parts 6 can be the same or different.

[0185] Optionally, the shape of the extension part 6 can be a cylinder, a cuboid, a polygonal prism, or other regular or irregular shapes; the shape of the main body part 5 can be a cylinder, a cuboid, a polygonal prism, or other regular or irregular shapes. The shapes of the extension part 6 and the main body part 5 can be the same or different. In a specific embodiment, the extension part 6 and the main body part 5 are cuboids with different sizes.

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

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

[0188] As shown in FIGS. 5-7, the extension part 6 protrudes from the main body part 5 along the length direction X of the first shell wall, and the length of the extension part 6 along the length direction X of the first shell wall is greater than the length of the main body part 5 along the length direction X of the first shell wall.

[0189] Optionally, the extension part 6 can protrude relative to the main body part 5 along one side of the length direction X of the first shell wall (e.g., the left side of the main body part 5 in FIG. 5), and the extension part 6 can also protrude relative to the main body part 5 along the other side of the length direction X of the first shell wall (e.g., the right side of the main body part 5 in FIG. 5).

[0190] The length of the extension part 6 along the length direction X of the first shell wall is greater than the length of the main body part 5 along the length direction X of the first shell wall, and the specific size of the extension part 6 is not limited here, as long as it can be processed and achieve the heat dissipation effect.

[0191] Thus, the length of the extension part 6 along the length direction X of the first shell wall can be increased, the circumferential perimeter of the terminal plate 4 can be increased, the contact area of the terminal plate 4 with air can be increased, thereby increasing the heat dissipation area, improving the heat dissipation capacity of the electrode terminal 3, and further improving the use performance of the battery monomer 10.

[0192] In some embodiments, the battery monomer 10 includes at least two electrode terminals, the at least two electrode terminals include a first electrode terminal 31 and a second electrode terminal 32, the first electrode terminal 31 includes a first main body part 51 and a first extension part 61, the second electrode terminal 32 includes a second main body part 52 and a second extension part 62, the first extension part 61 and the second extension part 62 protrude towards the same side of each other along the length direction X of the first shell wall; or, the first extension part 61 and the second extension part 62 protrude towards the same side along the length direction X of the first shell wall.

[0193] As shown in FIGS. 5-7, 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 embodiments, the first electrode terminal 31 has a first terminal plate 41 including the first main body portion 51 and the first extension portion 61. In other embodiments, the second electrode terminal 32 has a second terminal plate 42 including the second main body portion 52 and the second extension portion 62.

[0194] Optionally, the first extension portion 61 and the second extension portion 62 can respectively protrude from the respective main body portion 5 along the length direction X of the first housing wall and extend toward the same side (opposite extension directions). Optionally, the first extension portion 61 and the second extension portion 62 can respectively protrude from the respective main body portion 5 along the length direction X of the first housing wall and extend toward the opposite side.

[0195] In some embodiments, the first electrode terminal 31 and the second electrode terminal 32 can be respectively located at two ends or a middle position of the first housing wall 11 along the length direction X of the first housing wall 11; the first electrode terminal 31 and the second electrode terminal 32 can be both located at one end of the first housing wall 11 along the length direction X of the first housing wall 11; one of the first electrode terminal 31 and the second electrode terminal 32 can be located at a middle position of the first housing wall 11 along the length direction X of the first housing wall 11, and the other can be located at an end position of the first housing wall 11 along the length direction X of the first housing wall 11; or the first electrode terminal 31 and the second electrode terminal 32 can be arranged irregularly. The above embodiments are only examples of the positions of the first electrode terminal 31 and the second electrode terminal 32, and do not limit the present disclosure. Of course, the first electrode terminal 31 and the second electrode terminal 32 can 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 at approximately a middle position of the first housing wall 11 along the length direction X of the first housing wall 11.

[0196] The first electrode terminal 31 and the second electrode terminal 32 can have the same shape or different shapes. The first electrode terminal 31 can have one, two, three, or four extension portions, and the second electrode terminal 32 can have one, two, three, or four extension portions. The first electrode terminal 31 and the second electrode terminal 32 can have the same number of extension portions 6 or different numbers of extension portions 6.

[0197] In one specific embodiment, as shown in FIG. 7, the first electrode terminal 31 and the second electrode terminal 32 are identical in shape, each of the first electrode terminal 31 and the second electrode terminal 32 has one extension extending along the length direction X of the first shell wall, and the first electrode terminal 31 and the second electrode terminal 32 are oppositely arranged along the length direction X of the first shell wall. Of course, the first electrode terminal 31 and the second electrode terminal 32 can also be arranged towards the same side (e.g. the left side or the right side in FIG. 7) along the length direction X of the first shell wall.

[0198] In another specific embodiment, as shown in FIG. 5, the first electrode terminal 31 and the second electrode terminal 32 are different in shape, the first electrode terminal 31 has one extension, the second electrode terminal 32 has two extensions, and the first electrode terminal 31 and the second electrode terminal 32 are oppositely arranged along the length direction X of the first shell wall. Of course, the first electrode terminal 31 and the second electrode terminal 32 can also be arranged towards the same side along the length direction X of the first shell wall. The above embodiments are only examples of the shape and placement of the first electrode terminal 31 and the second electrode terminal 32 on the first shell wall 11, and do not limit the present disclosure.

[0199] The electrode terminal 3 is provided in at least two, which can increase the contact area of the electrode terminal 3 with air, improve the heat dissipation capacity of the electrode terminal 3, and further improve the use performance of the battery monomer 10. The extension direction of the first extension and the second extension has multiple options, which improves the flexibility of the arrangement of the first extension and the second extension.

[0200] In some embodiments, the first extension 61 and the second extension 62 extend towards the side where they are close to each other along the length direction X of the first shell wall; or, the first extension 61 and the second extension 62 extend towards the same side along the length direction X of the first shell wall.

[0201] As shown in FIGS. 5 to 7, the first extension 61 and the second extension 62 project toward the side where they are close to each other along the length direction X of the first housing wall, and are arranged in the first extension 61 and the second extension 62 close to each other along the length direction X of the first housing wall, for example, in the orientation shown in FIG. 5, the first electrode terminal 31 and the second electrode terminal 32 are arranged along the length direction X of the first housing wall, the first extension 61 projects toward the second main body 52 (the right side of the first main body 51 in FIG. 5) relative to the first main body 51 along the length direction X of the first housing wall, and the second extension 62 projects toward the first main body 51 (the left side of the second main body 52 in FIG. 5) relative to the second main body 52 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 along the length direction X of the first housing wall, one side or the other side of the width direction Y of the first housing wall, and this will not be described here.

[0202] In other embodiments, the first extension 61 and the second extension 62 project toward the same side along the length direction X of the first housing wall, and are arranged in the first extension 61 and the second extension 62 along the length direction X of the first housing wall toward the same direction, for example, in the orientation shown in FIG. 5, the first electrode terminal 31 and the second electrode terminal 32 are arranged along the length direction X of the first housing wall, the first extension 61 projects away from the second extension 62 relative to the first main body 51 along the length direction X of the first housing wall (the left side of the first main body 51 in FIG. 5), and the second extension 62 projects toward the first main body 51 relative to the second main body 52 along the length direction X of the first housing wall (the left side of the second main body 52 in FIG. 5); or the first extension 61 projects toward the second extension 62 relative to the first main body 51 along the length direction X of the first housing wall (the right side of the first main body 51 in FIG. 5), and the second extension 62 projects away from the first main body 51 relative to the second main body 52 along the length direction X of the first housing wall (the right side of the second main body 52 in FIG. 5).

[0203] The extension direction of the first extension 61 and the second extension 62 has many varieties, improving the flexibility of the arrangement of the first extension 61 and the second extension 62.

[0204] In some embodiments, the terminal plate further comprises a plurality of extensions.

[0205] The extension part can be one extension part, two extension parts, or more extension parts. As shown in FIG. 6, the first terminal plate 41 includes a first extension part 61 and a third extension part 63 extending from the first main body part 51, and the third extension part 63 can extend along one side or the other side of the length direction X of the first shell wall, or one side or the other side of the width direction Y of the first shell wall relative to the first main body part 51. The extension directions of the third extension part 63 and the first extension part 61 can be the same or different. The third extension part 63 can be a cylinder, a cuboid, a polygonal prism, or other regular or irregular shapes. The shapes of the first extension part 61 and the third extension part 63 can be the same or different. In a specific embodiment, the first extension part 61 and the third extension part 63 are cuboids, and the extension directions of the first extension part 61 and the third extension part 63 are both the length direction X of the first shell wall.

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

[0207] One terminal plate 4 is provided with at least two extension parts 6, thereby being able to increase the heat dissipation area of the terminal plate 4, improve the heat dissipation capacity of the electrode terminal 3, and thereby improve the use performance of the battery monomer 10.

[0208] In some embodiments, the plurality of extension parts extend from the main body part 5 toward the same side along the length direction X of the first shell wall.

[0209] The plurality of extensions can project towards the same side or towards the opposite side along the length direction X of the first housing wall. As shown in Figs. 5 to 7, the third extension 63 and the first extension 61 project towards the same side or towards the opposite side along the length direction X of the first housing wall. By way of example in the orientation shown in Fig. 6, the third extension 63 and the first extension 61 project towards the same side along the length direction X of the first housing wall, the third extension 63 and the first extension 61 can project towards one side (left side of the first body portion 51 in Fig. 6) relative to the first body portion 51 along the length direction X of the first housing wall, or the third extension 63 and the first extension 61 can project towards the other side (right side of the first body portion 51 in Fig. 6) relative to the first body portion 51 along the length direction X of the first housing wall. The third extension 63 and the first extension 61 can project towards the opposite side along the length direction X of the first housing wall, i.e. one of the third extension 63 and the first extension 61 projects towards one side (left side of the first body portion 51 in Fig. 6) relative to the first body portion 51 along the length direction X of the first housing wall, and the other projects towards the other side (right side of the first body portion 51 in Fig. 6) relative to the first body portion 51 along the length direction X of the first housing wall. In a specific embodiment, the third extension 63 and the first extension 61 project towards the same side along the length direction X of the first housing wall.

[0210] As shown in Figs. 5 to 7, the fourth extension 64 and the second extension 62 project towards the same side or towards the opposite side along the length direction X of the first housing wall. By way of example in the orientation shown in Fig. 6, the fourth extension 64 and the second extension 62 project towards the same side along the length direction X of the first housing wall, the fourth extension 64 and the second extension 62 can project towards one side (left side of the second body portion 52 in Fig. 6) relative to the second body portion 52 along the length direction X of the first housing wall, or the fourth extension 64 and the second extension 62 can project towards the other side (right side of the second body portion 52 in Fig. 6) relative to the second body portion 52 along the length direction X of the first housing wall. The fourth extension 64 and the second extension 62 can also project towards the opposite side along the length direction X of the first housing wall, i.e. one of the fourth extension 64 and the second extension 62 projects towards one side (left side of the second body portion 52 in Fig. 6) relative to the second body portion 52 along the length direction X of the first housing wall, and the other projects towards the other side (right side of the second body portion 52 in Fig. 6) relative to the second body portion 52 along the length direction X of the first housing wall. In a specific embodiment, the fourth extension 64 and the second extension 62 project towards the same side along the length direction X of the first housing wall.

[0211] Of course, a terminal plate 4 can also have three, four or five extensions 6, wherein the extensions 6 can project in the same direction or in different directions.

[0212] When the terminal plate 4 is provided with at least two extension portions 6, the extension direction of the extension portion 6 can be the same or opposite, improving the flexibility of the arrangement of the extension portion 6.

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

[0214] As shown in FIGS. 5 to 7, the ratio of the length of the extension portion 6 to the length of the main body portion 5 along the width direction Y of the first shell wall is in the range of 0.4 to 0.8, i.e. 0.4≤Y1 / Y2≤0.8, where Y1 is the length of the extension portion 6 along the width direction Y of the first shell wall, and Y2 is the length of the main body portion 5 along the width direction Y of the first shell 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 can also be used. The smaller the value, the more extension portions 6 can be arranged on the main body portion 5, which helps to improve the heat dissipation capacity of the electrode terminal 3 while reducing the weight of the battery monomer 10. Of course, other ranges within the above range can also be used. For example, Y1 / Y2 can also be 0.3. The value of Y1 / Y2 of each extension portion can be the same or different.

[0216] In this way, one main body portion 5 can be provided with multiple extension portions 6, and the number of extension portions 6 can be increased. Under the same heat dissipation effect, the volume of the extension portion 6 can be reduced, the weight of the battery monomer 10 can be reduced, and the production cost can be reduced. By arranging the ratio of the length of the extension portion to the length of the main body portion in the range of 0.4 to 0.8 along the width direction Y of the first shell wall, the number of extension portions and the size of individual extension portions can be considered at the same time, thereby improving the 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. The ratio of the length of the first terminal plate 41 and the second terminal plate 42 to the length of the first shell wall 11 along the width direction Y of the first shell wall is in the range of 0.6 to 0.9. When the first terminal plate 41 and the second terminal plate 42 have different lengths along the length direction of the outer contour of the first shell wall, the maximum length is taken as the length of the first terminal plate and the length of the second terminal plate.

[0218] As shown in FIG. 5, the ratio of the length of the first terminal plate 41 to the length of the first housing wall 11 in the width direction Y of the first housing wall 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 in the width direction Y of the first housing wall, and W is the length of the first housing wall 11 in the width direction Y of the first housing wall. The width direction Y of the first housing wall is sometimes referred to as the thickness direction of the battery cell 10.

[0219] Alternatively, B11 / W = 0.6, B11 / W = 0.65, B11 / W = 0.7, B11 / W = 0.75, B11 / W = 0.8, B11 / W = 0.85, or B11 / W = 0.9, or the like, or other ratios within the above range can also be used. The larger the value, the better, which increases the size of the first terminal plate 41 in the width direction Y of the first housing wall, thereby allowing more extensions 6 extending in the length direction X of the first housing wall to be provided, thereby improving the heat dissipation capacity of the electrode terminal 3. Of course, other ranges within the above range can also be used. For example, B11 / W can also take 0.5.

[0220] As shown in FIG. 5, the ratio of the length of the second terminal plate 42 to the length of the first housing wall 11 in the width direction Y of the first housing wall 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 in the width direction Y of the first housing wall, and W is the length of the first housing wall 11 in the width direction Y of the first housing wall. The width direction Y of the first housing wall is the width direction of the first housing wall 11. The width direction Y of the first housing wall is sometimes referred to as the thickness direction of the battery cell 10.

[0221] Alternatively, B12 / W = 0.6, B12 / W = 0.65, B12 / W = 0.7, B12 / W = 0.75, B12 / W = 0.8, B12 / W = 0.85, or B12 / W = 0.9, or the like, or other ratios within the above range can also be used. The larger the value, the better, which increases the size of the second terminal plate 42 in the width direction Y of the first housing wall, thereby allowing more extensions 6 extending in the length direction X of the first housing wall to be provided, thereby improving the heat dissipation capacity of the electrode terminal 3. Of course, other ranges within the above range can also be used. For example, B12 / W can also take 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 of the first housing wall can be increased, thereby allowing the terminal plate 4 to be provided with multiple extensions 6, thereby improving the heat dissipation capacity of the electrode terminal 3.

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

[0224] As shown in FIG. 5, along the length direction X of the first shell wall, the length X1 of the first extension part 61 to the length X3 of the first terminal plate 41 is in the range of 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 in the above range. Of course, it can also be other ranges in the above range, for example, X1 / X3 can also take 0.4.

[0225] As shown in FIGS. 5 to 7, along the length direction X of the first shell wall, the length X2 of the second extension part 62 to the length X4 of the second terminal plate 42 is in the range of, i.e. 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 in the above range. Of course, it can also be other ranges in the above range, for example, X2 / X4 can also take 0.4. Wherein X1 / X3 and X2 / X4 can be the same or different.

[0226] Along the length direction X of the first shell wall, the size of the first extension part 61 in the first terminal plate 41 and / or the size of the second extension part 62 in the second terminal plate 42 is increased. Thus, the size of the extension part 6 is increased, the heat dissipation area of the extension part 6 is increased, and the heat dissipation performance of the electrode terminal 3 can be effectively improved.

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

[0228] As shown in FIG. 5, the ratio of the length X3 of the first terminal plate 41 along the length direction X of the first housing wall 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, and 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 within the above range are also possible, for example X3 / L can also take the value of 0.8.

[0229] As shown in FIG. 5 to FIG. 7, the ratio of the length X4 of the second terminal plate 42 along the length direction X of the first housing wall 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, and 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 within the above range are also possible, for example X4 / L can also take the value of 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] Increasing the size of the terminal plate 4 along the length direction X of the first housing wall increases the heat dissipation area of the terminal plate 4, thereby effectively improving the heat dissipation performance of the electrode terminal 3.

[0231] In some embodiments, the terminal plate includes a first terminal plate and a second terminal plate, the ratio of the length X3 of the first terminal plate 41 along the length direction X of the first housing wall to the length B11 of the first terminal plate 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 plate 42 along the length direction X of the first housing wall to the length B12 of the second terminal plate 42 along the width direction Y of the first housing wall is in the range of 3.5 to 10. When the outer contour of the first terminal plate 41 and the second terminal plate 42 along the length direction of the first housing wall has different lengths, the maximum length is taken as the length of the first terminal plate and the length of the second terminal plate.

[0232] As shown in FIG. 5 to FIG. 7, the terminal plate includes a first terminal plate and a second terminal plate, in the first terminal plate 41, the ratio of the length X3 thereof along the length direction X of the first housing wall to the length B11 thereof along the width direction Y of the first housing wall is in the range of 3.5 to 10, i.e. 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 range. Of course, other ranges within the above range are also possible, such as X3 / B11 = 3.

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

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

[0236] The terminal plate 4 is provided in an elongated shape, which is conducive to increasing the heat dissipation area of the terminal plate 4 and further improving the heat dissipation performance of the electrode terminal 3.

[0237] In some embodiments, as shown in FIG. 8, the first electrode terminal 31 includes a first terminal plate 41, at least a portion of the first terminal plate 41 is disposed on the side of the first housing wall 11 away from the accommodation space 12, and the second electrode terminal 32 includes a second terminal plate 42, the second terminal plate 42 is disposed on the side of the first housing wall 11 away from the accommodation space.

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

[0239] Optionally, the first terminal plate 41 and the second terminal plate 42 are each configured in a substantially flat plate shape. The shape of the flat plate can be designed according to the situation, such as rectangular, circular, etc.

[0240] Optionally, the first terminal plate 41 and the second terminal plate 42 can be fixed together with the first housing wall 11 by connecting columns or the like.

[0241] In this way, the connection with busbars and the like can be achieved, and electrical connection with external structures can be achieved.

[0242] In some embodiments, the first electrode terminal 31 includes a first terminal plate 311 disposed at least partially on the side of the first housing wall 11 facing the accommodation space 12, and the second electrode terminal 32 includes a second terminal plate 321 disposed at least partially on the side of the first housing wall 11 facing the accommodation space 12. In the thickness direction of the first housing wall, the first terminal plate is disposed at least partially between the second terminal plate and the first housing wall, or in the thickness direction of the first housing wall, the second terminal plate is disposed at least partially between the first terminal plate and the first housing wall.

[0243] The first terminal plate 311 and the second terminal plate 321 are located on the inner side of the battery cell housing 1 and can be used to electrically connect with the tab. The terminal plate can be made of metal, such as copper, aluminum, etc.

[0244] Optionally, the first terminal plate 311 and the second terminal plate 321 each have a generally flat plate shape. The shape of the flat plate can be designed according to the situation, for example, it can be rectangular, circular, L-shaped as shown in FIG. 8, etc.

[0245] Optionally, the first terminal plate 311 and the second terminal plate 321 can be fixed together with the first housing wall 11 by connecting columns, etc.

[0246] Since the electrode terminal 3 includes a terminal plate located outside the battery cell 10 housing 1 and a terminal plate located inside the housing 1, the electrode terminal 3 can be easily connected with the tab of the electrode assembly 7 through the terminal plate, and the heat dissipation, the support of the first housing wall 11 and the connection strength with the busbar 2 can be improved by designing the terminal plate to be larger, and the shape design freedom of the terminal plate and the terminal plate is higher. Moreover, the terminal plate and the terminal plate respectively clamp the first housing wall 11 from the inside and outside of the housing 1, which can improve the bending strength of the first housing wall 11.

[0247] In some embodiments, the first electrode terminal 31 further includes a first terminal plate 311 disposed at least partially on the side of the first housing wall 11 facing the accommodation space 12, and the second electrode terminal 32 further includes a second terminal plate 321 disposed at least partially on the side of the first housing wall 11 facing the accommodation space 12, and the first main body part 51 and the first terminal plate 311 are directly connected by a first connecting column 312; the second main body part 52 and the second terminal plate 321 are directly connected by a second connecting column 322.

[0248] As shown in FIG. 8, the first terminal plate 41 and the first terminal disc 311 are connected by the first connecting post 312, which is used to connect the first body portion 51 of the first terminal plate 41. The shape, size or number of the first connecting post 312 is not limited as long as the connection of the first terminal plate 41 and the first terminal disc 311 can be achieved. In one specific embodiment, the first connecting post 312 is elliptical.

[0249] The first connecting post 312 can be connected to the first body portion 51 of the first terminal plate 41 or the first terminal disc 311 by means of screwing, welding, riveting or the like, or can be formed integrally with the first body portion 51 of the first terminal plate 41 or the first terminal disc 311. The second connecting post 322 can be connected similarly to the first connecting post 312, and thus, the first connecting post 312 is described in detail here, and the detailed description of the second connecting post 322 is omitted.

[0250] In some embodiments, as shown in FIG. 8, the first connecting post 312 is formed integrally with the first terminal disc 311 and extends perpendicularly relative to the disc surface of the first terminal disc 311. A through hole is formed in the first body portion 51 of the first terminal plate 41, the first connecting post 312 is inserted into the through hole and fixedly connected to the first body portion 51. In this way, the first electrode terminal 31 can be assembled to the first housing wall 11. In addition, a terminal sealing member can be further assembled between the first connecting post 312 and the first body portion 51.

[0251] Since the terminal plate 4 and the terminal disc can be connected together by the connecting post, the electrode terminal 3 can play a role of leading current from the electrode assembly 7. Moreover, the connecting post is provided on the body portion 5, so that the electrode terminal 3 can be reliably fixed to the first housing wall 11 at the body portion 5.

[0252] In some embodiments, as shown in FIG. 4, FIG. 5, FIG. 7 and FIG. 8, the electrode assembly includes first and second pole pieces of opposite polarity, the first electrode terminal 31 is electrically connected to the first pole piece of the electrode assembly, and the second electrode terminal 32 is electrically connected to the second pole piece of the electrode assembly.

[0253] The first and second pole pieces are led out by the tabs and connected to the electrode terminals directly or indirectly. As shown in FIG. 3, the tabs include first and second tabs 71 and 72.

[0254] One of the first and second tabs 71 and 72 can be a positive tab, and the other can be a negative tab. The first and second electrode terminals 31 and 32 can be connected to one of the positive tab and the other of the negative tab, or the first and second electrode terminals 31 and 32 can be connected to the first tab 71 and have the same polarity as the first tab 71, or the first and second electrode terminals 31 and 32 can be connected to the second tab 72 and have the same polarity as the second tab 72.

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

[0256] Thus, the first and second electrode terminals 31 and 32 can have the same or different polarities according to the situation, and the electrode terminals 3 can be arranged on the housing of the battery cell 10 flexibly as needed.

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

[0258] Thus, the first and second terminal plates 311 and 321 can be further improved in bending strength by being arranged to engage with each other, and the first and second terminal plates 311 and 321 can be electrically connected to each other, which facilitates simplifying the connection structure when the two electrode terminals 3 have the same polarity.

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

[0260] The first protruding portion 314 refers to a portion of structure protruding from the first terminal plate 41 and entering the outer contour of the second terminal plate 42. The first recessed portion 315 refers to a recess formed with respect to the surface of the second terminal plate 42 and capable of accommodating the first protruding portion 314. The recess can be formed by a groove or by a step. In the case of being formed by a step, the step can include a one-step, a two-step, or more steps.

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

[0262] In some embodiments, the battery cell 10 comprises a first insulating member 81 fixed with the first electrode terminal 31, and the second electrode terminal 32 is at least partially arranged between the first insulating member 81 and the first shell wall 11, and the first insulating member 81 abuts against the second electrode terminal 32.

[0263] The first electrode terminal 31 and the first insulating member 81 are fixed to each other in a manner such as integrally injection molding, bonding, fastening together by a connecting column, etc.

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

[0265] In the specific embodiments shown in FIG. 18, the first insulating member 81 is not located between the first electrode terminal 31 and the second electrode terminal 32, i.e., the first electrode terminal 31 is not pressed against the side of the first insulating member 81 away from the first shell wall 11. The side of the first insulating member 81 facing the first shell wall 11 abuts against the side of the second electrode terminal 32 away from the first shell wall 11, i.e., the bending deformation of the second electrode terminal 32 is restricted by the portion of the first insulating member 81. Here, the first insulating member 81 has a suitable bending strength.

[0266] The first insulating member 81 is at least used 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 shell wall 11.

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

[0268] This can insulate the first electrode terminal from the second electrode terminal, so that even if the first electrode terminal and the second electrode terminal have opposite polarities, the first insulating member can abut against the second electrode terminal to improve the bending resistance of the second electrode terminal. Moreover, in the case that the first insulating member has a suitable strength, the bending deformation of the second electrode terminal can be restricted by the first insulating member.

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

[0270] The first protruding part 314 includes a structure protruding from the first terminal plate 41, and also includes a structure protruding from the first insulating member 81. As shown in FIG. 13, in the case that a part of the first insulating member 81 (for example, the first covering part 811) abuts against the second electrode terminal 32 to limit the bending deformation, the part of the first insulating member 81 (for example, the first covering part 811) corresponds to the first protruding part 314. In the case that the first electrode terminal 31 and the first insulating member 81 abut against the second electrode terminal 32 to limit the bending deformation, the first protruding part 314 includes a part protruding from the second electrode terminal 32 and a part protruding from the first insulating member 81.

[0271] Optionally, the first electrode terminal 31 and the second electrode terminal 32 are connected with the positive and negative tabs respectively and have opposite polarities, and the second electrode terminal 32 is at least partially arranged between the first insulating member 81 and the first shell wall 11. Further optionally, the first insulating member 81 is arranged between the entire first electrode terminal 31 and the first shell wall 11, and a part of the first insulating member 81 is arranged between the first electrode terminal 31 and the first shell wall 11.

[0272] Optionally, the first electrode terminal 31 and the second electrode terminal 32 are connected with the same tab among the positive and negative tabs and have the same polarity, and no insulating member is arranged between the first electrode terminal 31 and the second electrode terminal 32. Optionally, the second electrode terminal 32 is at least partially arranged between the first electrode terminal 31 and the first shell wall 11. Further optionally, the first insulating member 81 is arranged between the entire first electrode terminal 31 and the first shell wall 11.

[0273] In this way, the first electrode terminal 31 can be insulated from the shell 1 of the battery monomer, and the first electrode terminal 31 and the second electrode terminal 32 can also be insulated from each other, so that even if the first electrode terminal 31 and the second electrode terminal 32 have opposite polarities, they can cooperate with each other to improve the bending resistance of each electrode terminal, and the design freedom of the electrode terminal on the shell of the battery monomer is improved. Moreover, in the case that the first insulating member 81 has appropriate strength, the bending deformation of the second electrode terminal 32 can be limited by the first insulating member 81.

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

[0276] In this way, the bending deformation of the second electrode terminal 32 can be jointly limited 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, so as to further increase the ability of the first electrode terminal 31 to support and fix the second electrode terminal 32, and improve the bending deformation resistance of each electrode terminal; the strength of the region of the first housing wall 11 where the electrode terminals are arranged can also be enhanced; in addition, the polarity of the electrode terminals has high freedom.

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

[0278] The first recess and the first protrusion can be arranged as shown in FIG. 18, which is not described herein.

[0279] In this way, the protrusion and the recess can be arranged between the two extensions, the recess of the second extension 62 is pressed against the first housing wall 11 by the protrusion of the first extension 61 which has been fixed to the first housing wall 11, so as to realize mutual support of the two electrode terminals, which is conducive to improving the bending strength of the electrode terminals.

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

[0281] Here, the first step portion 3151 is formed by a portion of the second terminal plate 42 that is lowered in the wall thickness direction of the first housing wall 11 toward the side away from the first housing wall 11, like the portion of the second terminal plate in the second dotted line frame (the right dotted line frame in FIG. 18), and a second step portion 3152 is further formed at a position further away from the protruding portion than the first step portion 3151, like the portion of the second terminal plate in the second dotted line frame (the right dotted line frame in FIG. 18). The first insulating member 81 has a first covering portion 811 that covers the second step portion 3152 from the side away from the first housing wall 11 in the wall thickness direction of the first housing wall 11, and the first protruding portion 314 includes the protruding portion and the first covering portion 811, and further includes a portion of the protruding portion in the first dotted line frame (the left dotted line frame in FIG. 18).

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

[0283] The first insulating member 81 also has a portion that covers the surface of the protruding portion that is in contact with the recessed portion, so that the first insulating member 81 is clamped between the protruding portion and the first step portion 3151 in a state in which the protruding portion is inserted into the first step portion 3151, so that an insulating state can be maintained.

[0284] The second step portion 3152 can be a portion that is lowered in the wall thickness direction Z of the first housing wall with respect to the surface of the second terminal plate 42 that is farthest away from the first housing wall 11, and the first covering portion 811 can be a portion of the first insulating member 81. The first covering portion 811 can be partially or entirely recessed in the second step portion 3152 in the wall thickness direction Z of the first housing wall.

[0285] The length of the second step portion 3152 and the first covering portion 811 in the length direction X of the first housing wall can be determined according to the creepage distance to be provided. Generally, the longer the length of the second step portion 3152 and the first covering portion 811 in the length direction X of the first housing wall, the greater the creepage distance and the higher the insulating reliability.

[0286] Thus, the extension portion and the first step portion 3151 can be matched to limit the bending deformation of the second terminal plate 42, and the extension portion is at least partially accommodated in the first step portion 3151 to reduce the space occupied by the extension portion and improve the space utilization. By arranging the first covering portion 811, the creepage distance on the surface of the first electrode terminal 31 and the second electrode terminal 32 can be increased, and the insulation reliability can be improved. Moreover, by accommodating the first covering portion 811 in the second step portion 3152, the covering portion does not occupy additional space, thereby improving the space utilization.

[0287] In some embodiments, as shown in FIG. 18, along the wall thickness direction of the first shell wall 11, the surface of the side of the first covering portion 811 away from the first shell wall 11 does not exceed the surface of the side of the first terminal plate 41 away from the first shell wall; and / or, along the wall thickness direction of the first shell wall 11, the surface of the side of the first covering portion away from the first shell wall does not exceed the surface of the side of the second terminal plate 42 away from the first shell wall 11.

[0288] The surface of the side of the first covering portion 811 away from the first shell wall 11 can be substantially flush or slightly lower than the surface of the side of the first terminal plate 41 away from the first shell wall. In addition, the surface of the side of the first covering portion 811 away from the first shell wall 11 can be substantially flush or slightly lower than the surface of the side of the second terminal plate 42 away from the first shell wall 11. In a specific embodiment, the surface of the side of the first covering portion 811 away from the first shell wall 11 is substantially flush with the surface of the side of the first terminal plate 41 away from the first shell wall, and the surface of the side of the second terminal plate 42 away from the first shell wall 11. Here, substantially flush means no obvious step difference.

[0289] Since the surface of the side of the first covering portion 811 away from the first shell wall 11 does not exceed the surface of the side of the first terminal plate 41 and / or the second terminal plate 42 away from the first shell wall 11, the first covering portion 811 does not occupy additional space in the wall thickness direction of the first shell wall of the battery monomer or even the battery pack, and to some extent avoids interference between the first covering portion 811 and the busbar, facilitating reliable connection of the busbar and the like with the first terminal plate 41 and the second terminal plate 42.

[0290] In some embodiments, along the wall thickness direction Z of the first shell wall, the height between the surface of the side of the first terminal plate 41 away from the shell wall and the surface of the side of the second terminal plate 42 away from the first shell 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, and of course other values within the above range can also be taken.

[0291] Thus, the first terminal plate 41 and the second terminal plate 42 are almost flush, which helps to jointly bear external pressure and improve the anti-deformation capability.

[0292] In some embodiments, as shown in FIG. 14, as shown in FIGS. 8, 13 and 14, the battery cell 10 further comprises a second insulating piece 82, which is at least partially located between the second electrode terminal 32 and the first shell wall 11.

[0293] The second electrode terminal 32 and the first shell wall 11 can have an insulating piece therebetween or can not have an insulating piece therebetween.

[0294] Optionally, the second electrode terminal 32 is connected with the negative tab, and no insulating piece is arranged between the second electrode terminal 32 and the first shell wall 11, and the first shell wall 11 or even the entire shell 1 is negatively charged.

[0295] Optionally, the second electrode terminal 32 is connected with the positive tab or the negative tab, and the second electrode terminal 32 and the first shell wall 11 have a second insulating piece 82 therebetween, so that the first shell wall 11 or even the entire shell 1 is insulated from the second electrode terminal 32 and is not charged.

[0296] Thus, the second electrode terminal 32 can be insulated from the shell 1 of the battery cell, and therefore, not only can be applied to the design scheme in which the shell is charged, but also can be applied to the design scheme in which the shell is not charged.

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

[0298] Alternatively, the first insulating piece 81 and the second insulating piece 82 can be separately formed or integrally formed. As a forming method, a common forming method such as mold forming can be used.

[0299] The first insulating piece 81 and the second insulating piece 82 can be formed in a shallow tray shape which generally matches the shapes 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 insulate the first electrode terminal 31 and the second electrode terminal 32 from the bottom surface and the peripheral surface of the first electrode terminal 31 and the second electrode terminal 32 along the wall thickness direction Z of the first shell wall.

[0300] Thus, the number of components can be reduced, and the assembly steps can be simplified.

[0301] In some embodiments, as shown in FIG. 8, the first shell wall 11 is formed with a first recess 131 and a second recess 132, and at least a portion of the first insulating piece 81 and at least a portion of the second insulating piece 82 are respectively located in the first recess 131 and the second recess 132.

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

[0303] One or two or more recesses can be formed in the first housing wall 11.

[0304] Corresponding to the recessed region, the portion of the first insulating member 81 and the second insulating member 82 located in the recess is formed with a protrusion that can be fitted with the recess, thereby being able to restrict 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 (direction perpendicular to the wall thickness direction Z of the first housing wall).

[0305] By causing at least a portion of the first insulating member 81 and at least a portion of the second insulating member 82 to be recessed into the recess on the first housing wall, it is advantageous to improve the mounting strength of the insulating member relative to the first housing wall 11, reduce the possibility of displacement of the insulating member along the surface of the first housing wall 11, and facilitate positioning of the insulating member and the first housing wall 11 relative to each other when assembled.

[0306] In some embodiments, as shown in FIG. 8, the first recess 131 and the second recess 132 form the same recess.

[0307] This can reduce the number of parts and simplify the assembly steps.

[0308] In some embodiments, as shown in FIGS. 13 and 14, the first recess 315 is provided on the side of the second extension 62 facing the first electrode terminal 31, and the 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 part 51 is fixedly connected to the first housing wall 11 by the first connecting column 312, so the connection of the first main body part 51 to the first housing wall 11 is firm. Moreover, compared with the first extending part 61, the shape of the first main body part 51 is also not easy to bend. Therefore, the first protruding part 314 mainly plays a role of preventing warping is arranged on the first main body part 51, the first recessed part 315 is arranged on the second extending part 62 which is easy to warp, and the first recessed part 315 is located between the first protruding part 314 and the first housing wall 11, so the first protruding part 314 prevents the first recessed part 315 and the second extending part 62 from warping away from the first housing wall 11 to a certain extent.

[0310] Therefore, the first recessed part 315 arranged on the second extending part 62 can be abutted by the first protruding part 314 arranged on the first main body part 51 and be fixed between the first protruding part 314 and the first housing wall 11, so the second extending part 62 is prevented from warping away from the first housing wall 11 to a certain extent due to the long extension, and the bending strength of the second extending part 62 and the entire second electrode terminal 32 is improved. Even if the electrode terminal is subjected to a pulling force by the busbar or the like, the electrode terminal is not easy to bend or break, and the connection reliability of the busbar and the electrode terminal is improved.

[0311] For the first extending part 61, the end extending away from the first main body part 51 can be fixed to the first housing wall 11 by the third connecting column 325.

[0312] In the embodiments shown in FIGS. 12 to 14, only one set of cooperating protruding part and recessed part is arranged, but more sets of protruding part and recessed part can also be arranged.

[0313] In some embodiments, as shown in FIG. 20, the first electrode terminal 31 is further provided with a second recessed part 316, the second electrode terminal 32 is further provided with a second protruding part 317, the second protruding part 317 and the second recessed part 316 at least partially overlap in the wall thickness direction Z of the first housing wall, the second protruding part 317 and the second recessed part 316 cooperate with each other, the second recessed part 316 is arranged on the side of the first extending part 61 facing the second electrode terminal 32, and the second protruding part 317 is arranged on the side of the second main body part 52 facing the first electrode terminal 31.

[0314] The second protruding part 317 refers to a part of the structure extending from the second electrode terminal 32 and entering the outer contour of the first electrode terminal 31. The second recessed part 316 refers to a recess formed with respect to the surface of the first electrode terminal 31 and capable of accommodating the second protruding part 317. The recess can be formed by a groove or by a step. In the case of a recess formed by a step, it can include a one-step, two-step or more steps.

[0315] Thus, by the cooperation of the second protruding portion 317 and the second recessed portion 316, the support and fixation of the first electrode terminal 31 by the second electrode terminal 32 are facilitated, the bending strength of the first electrode terminal 31 is improved, and the processing is facilitated; by arranging the second protruding portion 317 in the second recessed portion 316, the space occupied by the second protruding portion 317 is reduced, and the space utilization is improved.

[0316] In some embodiments, as shown in FIG. 20, the second recessed portion 316 includes a third stepped portion 3161 and a fourth stepped portion 3162, the fourth stepped portion 3162 is arranged on the side of the third stepped portion 3161 away from the second electrode terminal 32, the third stepped portion 3161 is part of the structure in the third dashed box (the left dashed box in FIG. 20), wherein the third dashed box also includes a part of the protruding portion, the fourth stepped portion 3162 is part of the structure in the fourth dashed box (the right dashed box in FIG. 20); the second protruding portion 317 includes the protruding portion arranged on the second electrode terminal 32, along the wall thickness direction Z of the first shell wall, a part of the first electrode terminal 31 is located between the protruding portion and the first shell wall 11, the protruding portion is at least partially accommodated in the stepped space formed by the third stepped portion 3161; the second protruding portion 317 further includes the second covering portion 812 arranged on the second insulating piece 82, along the wall thickness direction Z of the first shell wall, a part of the first electrode terminal 31 is located between the second covering portion 812 and the first shell wall 11, the second covering portion 812 is at least partially accommodated in the stepped space formed by the fourth stepped portion 3162.

[0317] Here, the third stepped portion 3161 is formed by the part of the first electrode terminal 31 that is lowered away from the first shell wall 11 along the wall thickness direction of the first shell wall 11, as shown in the part of the first electrode terminal located in the fourth dashed box (the right dashed box in FIG. 20) in FIG. 20, the fourth stepped portion 3162 is further formed at a position further away from the protruding portion than the third stepped portion 3161, as shown in the part of the first electrode terminal located in the fourth dashed box (the right dashed box in FIG. 20) in FIG. 20. The second insulating piece 82 has the second covering portion 812, the second covering portion 812 covers the fourth stepped portion 3162 from the side away from the first shell wall 11 along the wall thickness direction of the first shell wall 11, and the second protruding portion 317 includes the protruding portion and the second covering portion 812, wherein the third dashed box (the left dashed box in FIG. 20) further includes a part of the protruding portion.

[0318] The second protruding portion 317 includes the protruding portion and the second covering portion 812; the second recessed portion 316 includes the third stepped portion 3161 and the fourth stepped portion 3162.

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

[0320] The second insulating member 82 also has a portion covering the surface of the protruding portion in contact with the recessed portion, so that in a state in which the protruding portion is inserted into the third stepped portion 3161, the second insulating member 82 is sandwiched between the protruding portion and the third stepped portion 3161, so that an insulating state can be maintained.

[0321] As shown in FIG. 20, in the first electrode terminal 31, a fourth stepped portion 3162 is further formed at a position further away from the protruding portion than the third stepped portion 3161, and the second insulating member 82 has a second covering portion 812 covering the fourth stepped portion 3162 from the side facing away from the first housing wall 11 in the wall thickness direction of the first housing wall 11.

[0322] The fourth stepped portion 3162 can be a portion lowered in the wall thickness direction Z of the first housing wall with respect to the surface of the first electrode terminal 31 farthest away from the first housing wall 11; and the second covering portion 812 can be a portion of the second insulating member 82. In the wall thickness direction Z of the first housing wall, the second covering portion 812 can be partially or entirely recessed in the fourth stepped portion 3162.

[0323] The length of the fourth stepped portion 3162 and the second covering portion 812 in the length direction X of the first housing wall can be determined according to the creepage distance to be provided. Generally, the longer the length of the fourth stepped portion 3162 and the second covering portion 812 in the length direction X of the first housing wall, the greater the creepage distance and the higher the insulation reliability.

[0324] Thus, the cooperation of the protruding portion and the third stepped portion can achieve the limitation of the bending deformation of the first electrode terminal, and further accommodate the protruding portion at least partially in the third stepped portion to reduce the space occupied by the protruding portion and improve the space utilization. By providing the second covering portion, the creepage distance on the surface of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, by accommodating the second covering portion in the stepped portion, the second covering portion does not occupy additional space, thereby improving the space utilization.

[0325] In some embodiments, the minimum cross-sectional area S1 for the current to pass through in the extension portion 6 is in the range of 0.2 to 0.3 times the capacity P of the battery cell 10, where the unit of capacity is Ah.

[0326] S1 represents the minimum cross-sectional area through which the second extension portion 62 passes current, where 0.2 ≤ S1 / P ≤ 0.3. Alternatively, 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, and so on, or the ratio of S1 / P can be other ratios within the above range. Of course, the ratio of S1 / P can also be within other ranges, for example, S1 / P = 0.19. Here, the ratio of the minimum cross-sectional area through which the first extension portion 61 or the second extension portion 62 passes current 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 first extension portion 61 passes current and the minimum cross-sectional area through which the second extension portion 62 passes current can be the same or different.

[0328] The ratio of S1 to P is set within an appropriate range to allow the extension portion to have an appropriate current passing capacity.

[0329] In some embodiments, as shown in FIG. 7, along the length direction X of the first shell wall, the first extension portion 61 and the second extension portion 62 are located between the first body portion 51 and the second body portion 52; along the width direction Y of the first shell wall, the first extension portion 61 and the second extension portion 62 have a first overlapping portion 91, and the width direction Y of the first shell wall is the width direction of the first shell wall 11.

[0330] As shown in FIG. 7, along the width direction Y of the first shell wall, the first extension portion 61 and the second extension portion 62 have portions that overlap each other, i.e., the portions of the first extension portion 61 and the second extension portion 62 that are located in the dashed line box in the figure, which are referred to as the first overlapping portion 91. Here, the first overlapping portion 91 is not necessarily a portion where the first extension portion 61 and the second extension portion 62 overlap and contact each other, and includes a case where the projection portions of the first extension portion 61 and the second extension portion 62 each project into the same projection plane along the width direction Y of the first shell wall, or a case where the projection portions of the first extension portion 61 and the second extension portion 62 each project into the same projection plane along the width direction Y of the first shell wall and overlap each other completely.

[0331] Thus, by arranging the first extension portion 61 and the second extension portion 62 to overlap in the width direction Y of the first shell wall, the bending strength of the region of the first shell wall 11 where the electrode terminals are arranged can be improved by 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 conducive to the use of the non-electrode terminal arrangement region of the first shell wall 11, and further conducive to improving the volume utilization rate of the battery pack.

[0332] In some embodiments, as shown in FIG. 7, the material of the first body portion 51 and / or the second 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 can be made of copper. In some specific embodiments, for example, the material of the first body portion 51 on the positive side can be set to a metal material with better thermal conductivity.

[0334] In this way, the materials of the first body portion 51 and the second body portion 52 can be set according to the situation, which helps to reduce current loss, improve heat dissipation capacity, etc.

[0335] In some embodiments, as shown in FIG. 7, 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 of the first housing wall refers to the maximum length of the outer contour of the first housing wall 11 along the length direction X of the first housing wall. A can be 10%, 20%, 25%, 30%, 35%, or 40% of L.

[0337] In this way, the first overlapping portion 91 is set to be longer, which is conducive 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 FIG. 7, the length A of the first overlapping portion 91 along the length direction of the first housing wall is in the range of 3mm to 50mm.

[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] In this way, the first overlapping portion 91 is set to be longer, which is conducive 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 body portion 51 and the second body portion 52 have a second overlapping portion.

[0342] As shown in FIG. 7, along the length direction X of the first housing wall, the first body portion 51 and the second body portion 52 have an overlapping portion overlapping each other, which is referred to as a second overlapping portion. Here, the second overlapping portion is not necessarily a portion where the first body portion 51 and the second body portion 52 overlap and contact each other, and includes a case where the projection portions of the first body portion 51 and the second body portion 52, respectively, or the entirety of the projection portions coincide with each other when projected onto the same projection plane along the length direction X of the first housing wall.

[0343] Thus, since the overlapping portion is provided in both the length direction X of the first housing wall and the width direction Y of the first housing wall, the first electrode terminal 31 and the second electrode terminal 32 can be arranged compactly in both the length direction of the first housing wall 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 FIG. 7, the length of the first housing wall 11 along the width direction Y of the first housing wall is W, and the length of the second overlapping portion along the width direction Y of the first housing wall is B, and 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 of the first housing wall refers to the maximum length of the outer contour of the first housing wall 11 along the width direction Y of the first housing wall. B can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 60%, 70%, 75%, 80%, 90% of W. It can also be a ratio within the above range.

[0346] Thus, the length dimension of the second overlapping region along the width direction Y of the first housing wall is set to be relatively long, which is beneficial to improve the strength enhancement effect on the first housing wall 11.

[0347] In some embodiments, as shown in FIG. 7, along the length direction X of the first housing wall and the width direction Y of the first housing wall, the closest distance between the first electrode terminal 31 and the second electrode terminal 32 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 parts where the first electrode terminal 31 and the second electrode terminal 32 are closest to each other. The closest distance is greater than or equal to 0.3 mm, for example, it can be 0.3 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, etc. It is generally considered that in the case where there is an insulating member spacing between the parts where the first electrode terminal 31 and the second electrode terminal 32 are close to each other, it can be considered to be arranged closer, for example, the closest distance can be set to 0.3 mm or more. In the case where there is no insulating member spacing between the parts where the first electrode terminal 31 and the second electrode terminal 32 are close to each other, it is considered to be arranged slightly farther away, for example, the closest distance can be set to 2 mm or more.

[0349] Thus, the possibility of the first electrode terminal and the second electrode terminal being short-circuited with each other can be reduced.

[0350] In some embodiments, as shown in FIG. 7, the first electrode terminal 31 includes a first terminal plate 41, the second electrode terminal 32 includes a second terminal plate 42, and the first electrode terminal 31 and the second electrode terminal 32 each include a connecting region 93 for connecting with the busbar 2 for electrically connecting the plurality of battery cells 10 with each other, and the connecting region 93 is formed at least in the first overlapping portion.

[0351] Here, the connecting region 93 (the region shown by the oblique hatching in FIG. 7) is a surface region of the first electrode terminal 31 and the second electrode terminal 32 that connects with the busbar 2. The connection here includes welding, which can be ultrasonic welding, laser welding, or other suitable welding method.

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

[0353] Thus, the busbar 2 is connected with the portion of the first electrode terminal 31 and the second electrode terminal 32 that forms the first overlapping portion, and 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 and deformed, and are even less likely to break due to bending deformation.

[0354] In some embodiments, as shown in FIG. 7, the connecting region is also formed in at least either of the first main body portion 51 and the second main body portion 52.

[0355] Thus, the connection strength between the electrode terminal and the busbar can be further enhanced, the bending stress caused by the busbar can be further dispersed, and the deformation resistance of the electrode terminal and the first housing wall can be further improved.

[0356] In some embodiments, the area of the connecting region formed in the first overlapping portion is SA, and the total area of the connecting regions is S, and 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 regions. The ratio of SA to S is in the range of 50% to 100%, i.e., 50%≤SA / S≤100%. If the connecting region is only provided in the first overlapping portion, 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%, and the like, and of course other values within the above ranges are also possible.

[0359] The SA and S measurements can be made using existing area measurement methods, or can be calculated using software based on the acquired images.

[0360] In this way, the connection area can be arranged in the non-extended area in addition to the extended portion, and the arrangement of the connection area is 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 FIG. 7, the centerline position of the connection area formed in the first extended portion 61 in the width direction Y of the first housing wall is offset from the centerline position of the first housing wall 11 in the width direction Y of the first housing wall by a distance B3, and 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 extended portion 61 in the width direction Y of the first housing wall from 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 is in the range of 15% to 27%, i.e., 15%≤B3 / W≤27%.

[0363] Optionally, 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%, and the like, and of course other values within the above ranges are also possible.

[0364] By setting B3 to be no less than 15% of W, the first extended portion 61 is provided with sufficient distance from the center, thereby helping to separate the first extended portion 61 and the second extended portion 62 by a sufficient safety distance; by setting B3 to be no more than 27% of W, the first extended portion 61 can be provided with a certain distance from the edge of the first housing wall 11.

[0365] In some embodiments, as shown in FIG. 18, the electrode terminal includes a first electrode terminal 31 and a second electrode terminal 32, the first electrode terminal 31 is provided with a first protruding portion 314, and the second electrode terminal 32 is provided with a first recessed portion 315, the first protruding portion 314 and the first recessed portion 315 at least partially overlap in the wall thickness direction Z of the first housing wall, and the first protruding portion 314 and the first recessed portion 315 cooperate with each other.

[0366] The first protruding part 314 refers to a part of structure protruding from the first electrode terminal 31 and entering into the outer contour of the second electrode terminal 32. The first recessed part 315 refers to a recess formed with respect to the surface of the second electrode terminal 32 and capable of accommodating the first protruding part 314. The recess can be formed by a groove or by a step. In the case of being formed by a step, it can include a one-step, or a two-step or more steps.

[0367] Here, the first protruding part 314 and the first recessed part 315 in the mutual cooperation state can at least limit the displacement in the wall thickness direction Z of the first shell wall with respect to each other. Optionally, the first protruding part 314 and the first recessed part 315 in the mutual cooperation state can also limit the displacement in the length direction X of the first shell wall and / or the width direction Y of the first shell wall.

[0368] Thus, by cooperation of the first protruding part and the first recessed part, the support and fixation of the second electrode terminal by the first electrode terminal are facilitated, the bending strength of the second electrode terminal is improved, and the processing is facilitated. By arranging the first protruding part in the first recessed part, the space occupied by the first protruding part is reduced, and the space utilization is improved.

[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 part of the first terminal plate 41 being arranged on the side of the first shell wall 11 away from the accommodation space 12. The second electrode terminal 32 includes a second terminal plate 42, the second terminal plate 42 being arranged on the side of the first shell wall 11 away from the accommodation space 12. Along the wall thickness direction Z of the first shell 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 directly or indirectly abuts against the second terminal plate 42. The first terminal plate can directly abut against the second terminal plate 42, and no terminal disc can be included therebetween.

[0371] Thus, the bending strength of the electrode terminal 3 and the first shell wall 11 can be further improved by arranging the first terminal disc 311 and the second terminal disc 321 to mutually engage. Moreover, the first terminal disc 311 and the second terminal disc 321 can be electrically connected to each other, which facilitates simplifying 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 including a first terminal plate 41 disposed on a side of the first housing wall 11 facing away from the accommodation space 12, the first terminal plate 41 including a first main body portion 51 and a first extension portion 61 connected to each other, and a second electrode terminal 32 including a second terminal plate 42 disposed on a side of the first housing wall 11 facing away from the accommodation space 12, the second terminal plate 42 including a second main body portion 52 and a second extension portion 62 connected to each other, the first extension portion 61 and the second extension portion 62 being located between the first main body portion 51 and the second main body portion 52 along the length direction X of the first housing wall, and the first extension portion 61 and the second extension portion 62 being arranged along the width direction Y of the first housing wall.

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

[0374] The terminal plates can be designed to be larger to improve heat dissipation, improve the support of the first housing wall, and improve the connection strength with the busbar. The shapes of the terminal plates each have a high degree of freedom in design.

[0375] In some embodiments, along the 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, the length of the first housing wall 11 along the width direction of the first housing wall is W, W11 is within 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 second electrode terminal 32 being located between the first electrode terminal 31 and the first housing wall 11, so that the second electrode terminal 32 and the first electrode terminal 31 form an overlapping region along the thickness direction of the first housing wall 11. In FIG. 21, the length of the overlapping region along the width direction Y of the first housing wall is denoted by W11.

[0377] The length of the first housing wall 11 in the width direction Y of the first housing wall refers to the largest dimension among the lengths of the outer contour of the first housing wall 11 in the width direction of the first housing wall. In FIG. 21, the length of the first housing wall 11 in the width direction Y of the first housing wall is denoted by W.

[0378] The length W11 of the overlapping region in the width direction of the first housing wall can account for 10% to 90% of the length W of the first housing wall 11 in the width direction of the first housing wall, i.e., W11 / W is in the range of 10% to 90%. For example, it can account for 10%, 15%, 20%, 30%, 50%, 70%, 90%, and of course other values in the above range.

[0379] Thus, the first housing wall 11 can be fully utilized in the width direction Y of the first housing wall, and the support 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 region in 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 region in the width direction Y of the first housing wall can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 15 mm, 20 mm, 30 mm, 40 mm, 50 mm. Of course, it can also be other values in the range of 0.5 mm to 50 mm.

[0382] Thus, the length W11 of the overlapping region in the width direction of the first housing wall can be determined according to the length W of the first housing wall in the width direction of the first housing wall, and by setting the length W11 of the overlapping region in the width direction of the first housing wall to be larger, the support 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 be strengthened.

[0383] In some embodiments, as shown in FIG. 14, the length L11 of the overlapping region in 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 region in the length direction X of the first housing wall can be 0.5 mm, 1 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm. Of course, it can also be other values in the range of 0.5 mm to 6 mm.

[0385] Thus, by setting the length L11 of the overlapping region in the length direction of the first shell wall to be small, the fitting strength between the protruding portion and the recessed portion can be improved, and the space utilization can be improved.

[0386] In some embodiments, the first extension portion 61 is arranged offset from the center position of the first main portion 51 in the width direction Y of the first shell wall, and / or the second extension portion 62 is arranged offset from the center position of the second main portion 52 in the width direction Y of the first shell wall.

[0387] As shown in FIG. 21, the center position of the first main portion 51 in the width direction Y of the first shell wall is represented by the position where the dashed line O is located, the center position of the first extension portion 61 in the width direction Y of the first shell wall is represented by the dashed line O1, and the center position of the second extension portion 62 in the width direction Y of the first shell wall is represented by the dashed line O2. The offset distance can be 15% to 27% of the width of the first shell wall 11.

[0388] Thus, the first extension portion and the second extension portion can be arranged in the width direction of the first shell wall by fully utilizing the size of the first shell wall in the width direction of the first shell wall, which facilitates compact arrangement of the first electrode terminal and the second electrode terminal.

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

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

[0391] Thus, the electrode terminals can be arranged by fully utilizing the narrow side wall of the long strip-shaped battery monomer, which improves the flexibility of the battery monomer group and facilitates large-area heat dissipation.

[0392] The second aspect of the present disclosure provides a battery, comprising: a box 20 and at least two battery monomers 10 provided by the first aspect.

[0393] Since the battery adopts the above-mentioned battery monomer 10, the heat dissipation capacity of the electrode terminals in the battery monomer 10 is improved, and the use performance of the battery is improved.

[0394] In some embodiments, as shown in FIG. 15, the battery monomers 10 are arranged in the width direction of the first shell wall.

[0395] Thus, the volume utilization rate of the battery can be improved.

[0396] In some embodiments, the first electrode terminal 31 includes the first electrode terminal 31 including the first body portion 51 and the first extension portion 61 connected to each other, the second electrode terminal 32 includes the second body portion 52 and the second extension portion 62 connected to each other, at least a part of the first extension portion 61 and at least a part of the second extension portion 62 are located between the first body portion 51 and the second body portion 52 along the length direction of the first housing wall, 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 in adjacent battery cells 10, and are electrically connected by the busbar 2.

[0397] Since the busbar 2 is connected to the first extension portion 61 and the second extension portion 62 located between the first body portion 51 and the second body portion 52, the bending resistance of the connection site is strong, and thus the first electrode terminal 31, the second electrode terminal 32, and the first housing wall 11 are not easily bent and deformed or broken, thereby improving the use reliability of the battery.

[0398] In some embodiments, in the same battery cell 10, the first extension portion 61 and the second extension portion 62 have a first overlapping portion 91 (see FIG. 7) along the width direction of the first housing wall, and 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 the busbar 2.

[0399] Thus, the busbar 2 is connected to the site of the first electrode terminal 31 and the second electrode terminal 32 where the first overlapping portion 91 is formed, and since the site 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 and deformed, and are even less likely to be broken due to bending deformation, thereby improving the use reliability of the battery.

[0400] In some embodiments, as shown in FIG. 17, at least one of the box walls of the box body 20 has a boss 111a formed by 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, the projection of the first electrode terminal 31 and the second electrode terminal 32 does not exceed the projection of the boss 111a along the direction perpendicular to the box wall where the boss 111a is formed, and at least a part of the busbar 2 of the three of the first electrode terminal 31, the second electrode terminal 32, and the busbar 2 enters the receiving portion 111b.

[0401] Thus, it is possible to only increase the height of the box body at the position of the first electrode terminal, the second electrode terminal, and the busbar, thereby being able to inhibit the size of the battery and also being conducive to improving the volume utilization rate of the battery.

[0402] The third aspect of the present disclosure provides a power consuming device, the power consuming device comprising a plurality of the battery cell 10 provided by the first aspect or the battery provided by the second aspect, the battery cell 10 or the battery powering the power consuming device.

[0403] Thus, the power consuming device with the battery cell 10 or the battery with strong heat dissipation capacity of the electrode terminal can be provided, and the use performance of the power consuming device can be improved.

[0404] The fourth aspect of the present disclosure provides an energy storage device, the energy storage device comprising a plurality of the battery cell 10 provided by the first aspect or the battery provided by the second aspect, the battery cell 10 or the battery being configured to store and provide electric energy.

[0405] Thus, the energy storage device with the battery cell 10 or the battery with strong heat dissipation capacity of the electrode terminal can be provided, and the use performance of the energy storage device can be improved.

[0406] In one specific embodiment, the battery cell 10 comprises the shell 1, the electrode assembly 7 and the electrode terminal 3, the shell 1 has the accommodation space 12, the shell 1 comprises the first shell wall 11 which is the end cover of the shell 1, the electrode assembly 7 is arranged in the accommodation space 12, and the electrode terminal 3 is arranged on the first shell wall 11. The electrode terminal 3 comprises the terminal plate 4 which is used to be connected with the busbar 2, the terminal plate 4 comprises the main body part 5 and the extension part 6. The electrode terminal 3 adopts the local protruding structure, the perimeter of the electrode terminal 3 around is increased, and the heat dissipation area is increased; the protruding structure is the extension part 6, the tab welding mark (the welding mark exists in a part) is arranged on the extension part 6, the welding mark area can be increased, and the overcurrent capacity can be improved.

[0407] In the same terminal plate 4, the ratio of the length of the extension part 6 along the width direction Y of the first shell wall to the length of the main body part 5 along the width direction Y of the first shell wall is in the range of 0.4 to 0.8, wherein the length direction X of the first shell wall is the length direction of the first shell wall 11, and the width direction Y of the first shell wall is the width direction of the first shell wall 11, and the smaller the ratio is, the better the heat dissipation performance can be improved, and the smaller the ratio is, the more the number of the extension parts can be increased, and one terminal plate 4 can have a plurality of extension parts 6.

[0408] The ratio of the length of the terminal plate 4 along the width direction Y of the first shell wall to the length of the first shell wall 11 along the width direction Y of the first shell wall is in the range of 0.6 to 0.9. The length of the terminal plate 4 along the width direction Y of the first shell wall is as long as possible, so that the heat dissipation capacity of the terminal plate 4 is improved. In one terminal plate 4, the extension part 6 can be one or a plurality of, and when the extension part 6 is two, the extension parts 6 can be arranged symmetrically relative to the length direction X of the first shell wall.

[0409] In the same terminal plate 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 plate 4 along the length direction X of the first housing wall is greater than or equal to 0.5 and less than 1, and the longer the length of the terminal plate 4 along the length direction X of the first housing wall, the better the heat dissipation performance of the terminal plate 4 can be improved. 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 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 the longer the length of the terminal plate 4 along the length direction X of the first housing wall, the better the heat dissipation performance of the terminal plate 4 can be improved.

[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, and the terminal plate 4 is arranged in an elongated shape, further improving the heat dissipation performance of the electrode terminal 3.

[0411] The tab welding mark is partially arranged on the extension 6, which can increase the welding mark area. In the process of welding the tab to the center of the electrode terminal 3, if S1 represents the minimum cross-sectional area of one of the extensions 6 for passing current, and P represents the capacity of the battery monomer 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 appropriate overcurrent capacity.

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

[0413] The first terminal plate 41 and the second terminal plate 42 each include a connection area 93 for connecting with the busbar 2, which is used to electrically connect multiple battery monomers 10 with each other, and the connection area is formed at least on the first overlapping part 91. The connection area 93 is arranged with tabs, which can combine two rows of principle tabs into one row of tabs. If SA represents the area of the connection area 93 formed on the first overlapping part 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 center line position of the connecting area formed in the first extension part 61 on the width direction Y of the first shell wall relative to the center line position of the first shell wall 11 on the width direction Y of the first shell wall, B3 is in the range of 15% to 27% of W, on the one hand, the material of the original first overlapping part 91 is saved, the weight of the battery pack can be reduced, and cost reduction is realized. On the other hand, it is beneficial to the arrangement of the tab. If B3 is too small, the tabs on the two adjacent extension parts are prone to interference; if B3 is too large, the welding mark is too close to the welding mark on the other battery monomer 10, which affects welding.

[0415] The various embodiments / implementation forms provided by the present disclosure can be combined with each other without producing contradictions, if possible.

[0416] The above is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure. Industrial applicability

[0417] The present disclosure provides a battery monomer, a battery, a power utilization device, and an energy storage device. In the battery monomer, since the electrode terminal has at least one extension part, the contact area of the electrode terminal with air can be increased, thereby increasing the heat dissipation capacity of the electrode terminal. Since the first extension part and the second extension part are respectively used for connection with the bus member, after a plurality of battery monomers are arranged in the thickness direction, the positions of the first extension part and the second extension part of adjacent battery monomers are opposite to each other, which helps to shorten the connection path of the bus member. Since the electrode assembly is arranged in the accommodation space, the shell can protect the electrode assembly. Since the first shell wall is provided with the first electrode terminal and the second electrode terminal, the electrode assembly can be communicated with the outside through the electrode terminal.

Claims

1. A battery cell, wherein, Comprising: a housing having a housing space, the housing including a first housing wall; an electrode assembly disposed at least partially in the housing space; an electrode terminal provided to the first housing wall, the electrode terminal having a terminal plate for connection with a bus member, the terminal plate including a main body portion and at least one extension portion connected to the main body portion, the at least one extension portion being protrudingly provided to the main body portion in a direction perpendicular to a wall thickness of the first housing wall.

2. The battery cell according to claim 1, wherein the extension portion is protrudingly provided to the main body portion in a length direction of the first housing wall, a length of the extension portion being greater than a length of the main body portion.

3. The battery cell according to claim 1 or 2, wherein the battery cell includes at least two of the electrode terminals, the at least two electrode terminals including a first electrode terminal and a second electrode terminal, the first electrode terminal includes a first main body portion and a first extension portion, the second electrode terminal includes a second main body portion and a second extension portion, the first extension portion and the second extension portion project toward a side where the first extension portion and the second extension portion are closer to each other in the length direction of the first housing wall; or the first extension portion and the second extension portion project toward a side where the first extension portion and the second extension portion are farther away from each other in the length direction of the first housing wall; or the first extension portion and the second extension portion project toward a same side in the length direction of the first housing wall.

4. The battery cell according to any one of claims 1 to 3, wherein the terminal plate includes a plurality of extension portions.

5. The battery cell according to claim 4, wherein the plurality of extension portions project from the main body portion toward a same side in the length direction of the first housing wall.

6. The battery cell according to any one of claims 1 to 5, wherein a ratio of a length of the extension portion to a length of the main body portion is in a range of 0.4 to 0.8 in a width direction of the first housing wall.

7. The battery cell according to any one of claims 3 to 6, wherein the first electrode terminal includes a first terminal plate, the second electrode terminal includes a second terminal plate, a ratio of a length of the first terminal plate and the second terminal plate to a length of the first housing wall is in a range of 0.6 to 0.9 in a width direction of the first housing wall.

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

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

10. The battery cell according to claim 1, wherein The terminal plate includes a first terminal plate and a second terminal plate, 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 a side of the first housing wall facing away from the accommodation space, and the second electrode terminal includes a second terminal plate, which is disposed on a side of the first housing wall facing away from the accommodation space.

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

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

14. The battery cell according to any one of claims 11 to 13, wherein The electrode assembly includes first and second polar plates having opposite polarities, The first electrode terminal is electrically connected to the first polar plate, and the second electrode terminal is electrically connected to the second polar 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 is provided with a first protruding portion, and the second terminal plate is provided with a first recessed portion, The first protrusion and the first recess at least partially overlap in a wall thickness direction of the first housing wall.

17. The battery cell according to claim 16, wherein The battery cell further includes a first insulating member fixed to the 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 the second electrode terminal.

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

19. The battery cell according to claim 17 or 18, wherein In 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 the first insulating member and the second electrode terminal abuts 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 plate by a third connecting column, The first recess is provided on a side of the second extension facing the first electrode terminal, and the first protrusion is provided on a 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 step portion and a second step portion, and the second step portion is provided on a side of the first step portion away from the first terminal plate; The first protrusion includes a protruding portion provided by the first terminal plate, in the wall thickness direction of the first housing wall, a portion of the second terminal plate is located between the protruding portion and the first housing wall, and the protruding portion is at least partially accommodated in a step space formed by the first step portion; The first protrusion further includes a first covering portion provided by the first insulating member, in the wall thickness direction of the first housing wall, a portion of the second terminal plate is located between the first covering portion and the first housing wall, and the first covering portion is at least partially accommodated in a step space formed by the second step portion.

22. The battery cell according to claim 21, wherein In the wall thickness direction of the first housing wall, a surface of the first covering portion on a side facing away from the first housing wall does not exceed a surface of the first terminal plate on a side facing away from the housing wall; and / or In the wall thickness direction of the first housing wall, a surface of the first covering portion on a side facing away from the first housing wall does not exceed a surface of the second terminal plate on a side facing away from the first housing wall.

23. The battery cell according to any one of claims 11 to 22, wherein In the wall thickness direction of the first housing wall, a difference in height between a surface of the first terminal plate on a side facing away from the housing wall and a surface of the second terminal plate on a side 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 further comprises a second insulating member 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 member and the second insulating member are integrally formed.

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 respectively located in the first recess and the second recess.

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 provided on a side of the second extension portion facing the first electrode terminal, and the first protrusion is provided on a side of the first main body portion facing the second electrode terminal.

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

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

31. The battery cell according to claim 1, wherein a ratio of a minimum cross-sectional area S1 for current flow in the extension portion to a capacity P of the battery cell is in a range of 0.2 to 0.3, where the capacity is in Ah.

32. The battery cell according to claim 3, wherein the first extension portion and the second extension portion are located between the first main body portion and the second main body portion in a length direction of the first housing wall; and the first extension portion and the second extension portion have a first overlapping portion in a width direction of the first housing wall. ​ 33. The battery cell according to claim 32, wherein the first main body portion and / or the second main body portion is made of a different material than the first overlapping portion.

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

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

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

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

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

39. The battery cell according to any one of claims 32 to 37, wherein the first electrode terminal includes a first terminal plate, and the second electrode terminal includes a second terminal plate, the first terminal plate and the second terminal plate each include a connection region for connection with a bus member for electrically connecting a plurality of the battery cells to each other, and the connection region is formed at least in the first overlapping portion.

40. The battery cell according to claim 39, wherein the connection region is also formed in at least either the first main body portion or the second main body portion.

41. The battery cell according to claim 39 or 40, wherein an area of the connection region of the first overlapping portion is SA, and an area of all the connection regions is S, and SA is in a range of 50% to 100% of S.

42. The battery cell according to any one of claims 39 to 41, wherein a center line position of the connection region formed in the first extending portion in the width direction of the first housing wall is offset from a center line position of the first housing wall in the width direction of the first housing wall by a distance B3, and B3 is in a range of 15% to 27% of W.

43. The battery cell according to any one of claims 1 to 10, wherein the electrode terminal includes a first electrode terminal and a second electrode terminal, the first electrode terminal is provided with a first protruding portion, and the second electrode terminal is provided with a first recessed portion, the first protruding portion and the first recessed portion at least partially overlap in a wall thickness direction of the first housing wall, and the first protruding portion and the first recessed portion cooperate with each other. ​ 44. The battery cell according to any one of claims 1 to 10, wherein 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 the first terminal plate is disposed on a side of the first housing wall facing away from the accommodation space, the second electrode terminal includes a second terminal plate, the second terminal plate is disposed on a side of the first housing wall facing away from the accommodation space, the first terminal plate and the second terminal plate partially overlap in a wall thickness direction of the first housing wall, and the first terminal plate directly or indirectly abuts the second terminal plate.

45. The battery cell according to any one of claims 1 to 10, wherein 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 the first terminal plate is disposed on a side of the first housing wall facing away from the accommodation space, the first terminal plate includes a first main portion and a first extension portion connected to each other, the second electrode terminal includes a second terminal plate, the second terminal plate is disposed on a side of the first housing wall facing away from the accommodation space, the second terminal plate includes a second main portion and a second extension portion connected to each other, the first extension portion and the second extension portion are located between the first main portion and the second main portion in a length direction of the first housing wall, and the first extension portion and the second extension portion are arranged in a width direction of the first housing wall.

46. The battery cell according to any one of claims 1 to 45, wherein a portion where the first electrode terminal and the second electrode terminal overlap in a wall thickness direction of the first housing wall is an overlapping region, a length of the overlapping region in a width direction of the first housing wall is W11, a length of the first housing wall in the width direction is W, W11 is in a range of 10% to 90% of W.

47. The battery cell according to claim 46, wherein W11 is in a range of 0.5 mm to 50 mm.

48. The battery cell according to any one of claims 46 to 47, wherein a length of the overlapping region in a length direction of the first housing wall is L11, L11 is in a range of 0.5 mm to 6 mm.

49. The battery cell according to any one of claims 3 to 48, wherein the first extension portion is disposed offset from a center position of the first main portion in the width direction of the first housing wall; and / or the second extension portion is disposed offset from a center position of the second main portion in the width direction of the first housing wall.

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

51. A battery, wherein a case and at least two battery cells according to any one of claims 1 to 50 are included.

52. The battery according to claim 51, wherein the battery cells are arranged in a width direction of the first housing wall. ​ 53. The battery according to claim 52, wherein the first electrode terminal includes a first electrode terminal including a first body portion and a first extension portion connected to each other, the second electrode terminal includes a second body portion and a second extension portion connected to each other, 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 along a length direction of the first housing wall, in the adjacent battery cells, the first extension portion of one of the battery cells and the second extension portion of the other of the battery cells are arranged in the width direction and electrically connected by a bus member.

54. The battery according to claim 53, wherein in the same battery cell, the first extension portion and the second extension portion have a first overlapping portion in the width direction of the first housing wall, and in the adjacent battery cells, the first overlapping portion of one of the battery cells and the first overlapping portion of the other of the battery cells are electrically connected by the bus member.

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

56. The battery according to any one of claims 53 to 55, wherein at least one of the box walls of the box has a boss formed by bulging of the box wall toward a direction away from the battery cell, the boss forms a receiving portion on a side toward the battery cell, along a direction perpendicular to the box wall in which the boss is formed, projections of the first electrode terminal and the second electrode terminal do not exceed a projection of the boss, and the first electrode terminal and / or the second electrode terminal is / are at least partially received in the receiving portion.

57. An electrical device, wherein, the electric device includes a plurality of the battery cell according to any one of claims 1 to 50 or the battery according to any one of claims 51 to 56, and the battery cell or the battery supplies power to the electric device.

58. An energy storage device, wherein, the energy storage device includes a plurality of the battery cell according to any one of claims 1 to 50 or the battery according to any one of claims 51 to 56, and the battery cell or the battery stores and can supply electric power.

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