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

Abstract

The utility model provides a battery monomer, a battery, a power utilization device and an energy storage device. The battery cell provided by the utility model comprises a shell with an accommodating space, and the shell comprises a first shell wall; the electrode assembly is at least partially arranged in the accommodating space; the electrode terminal is arranged on the first shell wall, the electrode terminal is provided with a terminal plate, the terminal plate is used for being connected with the bus piece, the terminal plate comprises a main body part and at least one extension part connected with the main body part, and the at least one extension part is arranged on the main body part in a protruding mode in the direction perpendicular to the wall thickness direction of the first shell wall.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery cell, a battery, an electrical device, and an energy storage device. Background Art

[0002] With the popularization and implementation of the concept of green development, new energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly applied to the energy storage field and so on.

[0003] In the existing battery system, a battery includes an electrode assembly and electrode terminals. The electrode assembly realizes the power supply function through the electrical connection between the tab and the electrode terminals. Among them, the heat at the welding joint between the tab and the electrode terminal and the welding joint inside the electrode terminal is mainly transferred to the outside through the electrode terminal. As people's requirements for battery fast charging technology are getting higher and higher, the heat dissipation requirements for the electrode terminals are also getting higher and higher. How to improve the heat dissipation effect of the electrode terminals is one of the research directions in the industry. Summary of the Utility Model

[0004] In view of this, the present application expects to provide a battery cell, a battery, an electrical device, and an energy storage device that can improve the heat dissipation effect of the electrode terminals.

[0005] To achieve the above object, the following technical solutions are adopted in the present application.

[0006] A first aspect of the present application provides a battery cell, including: a housing having an accommodation space, the housing including a first housing wall; an electrode assembly, at least partially disposed in the accommodation space; an electrode terminal disposed on the first housing wall, the electrode terminal having a terminal plate for connecting with a bus bar, the terminal plate including a main body portion and at least one extension portion connected to the main body portion, and along the wall thickness direction perpendicular to the first housing wall, the at least one extension portion protrudes from the main body portion.

[0007] The arrangement that the extension portion protrudes from the main body portion along the wall thickness direction perpendicular to the first housing wall can increase the contact area between the terminal plate and the air, thereby increasing the contact area between the electrode terminal and the air, increasing the heat dissipation area, improving the heat dissipation performance of the electrode terminal, and further improving the service performance of the battery cell.

[0008] In some embodiments, along the length direction of the first housing wall, the extension portion protrudes from the main body portion, and the length of the extension portion is greater than the length of the main body portion.

[0009] Thus, it is possible to increase the length of the extension portion along the length direction of the first housing wall, increase the circumferential perimeter of the terminal plate, increase the contact area between the terminal plate and air, thereby increasing the heat dissipation area, improving the heat dissipation capacity of the electrode terminal, and further improving the performance of the battery cell.

[0010] In some embodiments, the battery cell 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 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 extend toward the side close to each other along the length direction of the first housing wall; or, the first extension portion and the second extension portion extend toward the side away from each other along the length direction of the first housing wall; or, the first extension portion and the second extension portion extend toward the same side along the length direction of the first housing wall.

[0011] The electrode terminals are provided as at least two, which can increase the contact area between the electrode terminals and air, improve the heat dissipation capacity of the electrode terminals, and further improve the performance of the battery cell. There are various extension directions of the first extension portion and the second extension portion, which improves the flexibility of the arrangement of the first extension portion and the second extension portion.

[0012] In some embodiments, the terminal plate includes a plurality of extension portions.

[0013] One terminal plate can be provided with at least two extension portions, thereby being able to increase the heat dissipation area of the terminal plate, improve the heat dissipation capacity of the electrode terminal, and further improve the performance of the battery cell.

[0014] In some embodiments, the plurality of extension portions extend from the main body portion toward the same side along the length direction of the first housing wall.

[0015] When there are at least two extension portions on one terminal plate, the extension directions of the extension portions can be the same or opposite, which improves the flexibility of the arrangement of the extension portions.

[0016] In some embodiments, along the width direction of the first housing wall, the ratio of the length of the extension portion to the length of the main body portion is in the range of 0.4 to 0.8.

[0017] Thus, a main body portion can be provided with a plurality of extension portions, which can increase the number of extension portions. Under the same heat dissipation effect, the volume of the extension portion can be reduced, the weight of the battery cell can be reduced, and the production cost can be reduced. Along the width direction of the first housing wall, by setting 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, the number of extension portions and the size of a single extension portion can be taken into account simultaneously, thereby improving the heat dissipation performance.

[0018] In some embodiments, the first electrode terminal includes a first terminal plate, and the second electrode terminal includes a second terminal plate. Along the width direction of the first housing wall, the ratio of the length of the first terminal plate and the second terminal plate to the length of the first housing wall is in the range of 0.6 to 0.9.

[0019] It is possible to increase the width of the terminal plate along the width direction of the first housing wall, so that the terminal plate is provided with a plurality of extension portions, thereby improving the heat dissipation capacity of the electrode terminal.

[0020] In some embodiments, the terminal plate includes a first terminal plate and a second terminal plate. The first terminal plate includes a first extension portion, and the second terminal plate includes a second extension portion. Along the length direction of the first housing wall, the ratio of the length of the first extension portion to the length of the first terminal plate is greater than or equal to 0.5 and less than 1; and / or, along the length direction of the first housing wall, the ratio of the length of the second extension portion to the length of the second terminal plate is greater than or equal to 0.5 and less than 1.

[0021] Along the length direction of the first housing wall, increase the size of the first extension portion in the first terminal plate, and / or the size of the second extension portion in the second terminal plate. Thereby increasing the size of the extension portion and increasing the heat dissipation area of the extension portion, which can effectively improve the heat dissipation performance of the electrode terminal.

[0022] In some embodiments, the terminal plate includes a first terminal plate and a second terminal plate. Along the length direction of the first housing wall, the ratio of the length of the first terminal plate to the length of the first housing wall is in the range of 0.2 to 0.7; and / or, along the length direction of the first housing wall, the ratio of the length of the second terminal plate to the length of the first housing wall is in the range of 0.2 to 0.7.

[0023] Along the length direction of the first housing wall, increase the size of the terminal plate, thereby increasing the heat dissipation area of the terminal plate and effectively improving the heat dissipation performance of the electrode terminal.

[0024] In some embodiments, 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.

[0025] The terminal plate is arranged in an elongated shape, which is beneficial to increasing the heat dissipation area of the terminal plate and further improving the heat dissipation performance of the electrode terminal.

[0026] In some embodiments, the first electrode terminal includes a first terminal plate, at least a part 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, and the second terminal plate is disposed on a side of the first housing wall facing away from the accommodation space.

[0027] Thus, it can be connected to a bus bar or the like, and electrical connection with an external structure can be achieved.

[0028] In some embodiments, the first electrode terminal includes a first terminal disc, at least a part of the first terminal disc is disposed on a side of the first housing wall facing the accommodation space, the second electrode terminal includes a second terminal disc, at least a part of the second terminal disc is disposed on a side of the first housing wall facing the accommodation space, along the wall thickness direction of the first housing wall, at least a part of the first terminal disc is disposed between the second terminal disc and the first housing wall; or, along the wall thickness direction of the first housing wall, at least a part of the second terminal disc is disposed between the first terminal disc and the first housing wall.

[0029] Since the electrode terminal includes a terminal plate located outside the outer shell of the battery cell and a terminal disc located inside the outer shell, the electrode terminal can be easily connected to the tab of the electrode assembly through the terminal disc, and the heat dissipation can be improved by designing the terminal plate to be larger, the supporting effect on the first housing wall can be improved, and the connection strength with the bus bar can be improved. The shape design freedom of the terminal plate and the terminal disc is relatively high. Moreover, the terminal plates sandwich the first housing wall from the inside and outside of the outer shell respectively, which can improve the bending strength of the first housing wall.

[0030] In some embodiments, the first electrode terminal further includes a first terminal disc, at least a part of the first terminal disc is disposed on a side of the first housing wall facing the accommodation space, the second electrode terminal further includes a second terminal disc, at least a part of the second terminal disc is disposed on a side of the first housing wall facing the accommodation space, the first main body portion and the first terminal disc are directly connected through a first connecting column; the second main body portion and the second terminal disc are directly connected through a second connecting column.

[0031] Since the terminal plate and the terminal disc can be connected together through the connecting column, it can function as an electrode terminal to lead out current from the electrode assembly. Moreover, the connecting column is disposed on the main body portion, so that the electrode terminal can be reliably fixed to the first housing wall at the main body portion.

[0032] In some embodiments, the electrode assembly includes a first electrode sheet and a second electrode sheet with opposite polarities, the first electrode terminal is electrically connected to the first electrode sheet, and the second electrode terminal is electrically connected to the second electrode sheet.

[0033] In this way, electrode terminals with opposite polarities can be arranged on the first housing wall of the battery cell, which is beneficial to reducing the space occupied by components such as busbars, and is also beneficial to arranging other structural components such as heat exchange components on other housing walls of the battery cell, thus being beneficial to improving the volume utilization rate of the battery.

[0034] In some embodiments, along the wall thickness direction of the first housing wall, at least a part of the second terminal plate is arranged between the first terminal plate and the first housing wall, and the first terminal plate abuts against the second terminal plate.

[0035] Thus, the bending strength of the electrode terminals and the first housing wall can be further improved by arranging the first terminal plate and the second terminal plate to be engaged with each other; moreover, the first terminal plate and the second terminal plate can be electrically connected to each other, which is convenient for simplifying the connection structure when the two electrode terminals have the same polarity.

[0036] In some embodiments, the first terminal plate has a first protrusion, the second terminal plate has a first recess, and at least a part of the first protrusion and the first recess overlap along the wall thickness direction of the first housing wall, and the first protrusion and the first recess cooperate with each other.

[0037] Thus, through the cooperation of the first protrusion and the first recess, it is convenient to realize the support and fixation of the first electrode terminal to the second electrode terminal, improve the bending strength of the second electrode terminal, and is convenient for processing; by arranging the first protrusion in the first recess, the space occupied by the first protrusion can be reduced, and the space utilization rate can be improved.

[0038] In some embodiments, the battery cell further includes a first insulating member, which is fixed to the first electrode terminal, at least a part of the second electrode terminal is arranged between the first insulating member and the first housing wall, and the first insulating member abuts against the second electrode terminal.

[0039] Thus, the first electrode terminal and the second electrode terminal can be insulated from each other. Therefore, even if the first electrode terminal and the second electrode terminal have opposite polarities, the bending resistance of the second electrode terminal can be improved by the first insulating member abutting against the second electrode terminal. Moreover, when the first insulating member has appropriate strength, the bending deformation of the second electrode terminal can be restricted by the first insulating member.

[0040] In some embodiments, the first insulating member is partially arranged between the first electrode terminal and the first housing wall.

[0041] Thus, the first electrode terminal and the first housing wall can be insulated from each other.

[0042] In some embodiments, along the wall thickness direction of the first housing wall, the first electrode terminal, the first insulating member, and the second electrode terminal partially overlap, and the portion of the first electrode terminal that overlaps with the first insulating member and the second electrode terminal abuts against the first insulating member.

[0043] Thereby, the bending deformation of the second electrode terminal can be jointly restricted by the first electrode terminal and the first insulating member, and the first electrode terminal and the second electrode terminal are insulated from each other, 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; moreover, the strength of the region where the electrode terminal is arranged in the first housing wall can also be strengthened; in addition, the degree of freedom in setting the polarity of the electrode terminal is high.

[0044] In some embodiments, the first extension portion is connected to the first terminal plate through a third connecting column, the first recessed portion is disposed on a side of the second extension portion facing the first electrode terminal, and the first protruding portion is disposed on a side of the first extension portion facing the second electrode terminal.

[0045] Thereby, the first recessed portion provided on the second extension portion can be abutted by the first protruding portion provided on the first main body portion and fixed between the first protruding portion and the first housing wall, so that the second extension portion can be prevented to a certain extent from tilting away from the first housing wall due to the long extension, and the bending strength of the second extension portion and the entire second electrode terminal is improved. Even if a pulling force is applied to the electrode terminal by a bus bar or the like, the electrode terminal is not easily bent or broken, and the connection reliability between the bus bar and the electrode terminal is improved.

[0046] In some embodiments, the first recessed portion includes a first step portion and a second step portion, and the second step portion is disposed on a side of the first step portion away from the first terminal plate; the first protruding portion includes a protruding portion provided on the first terminal plate, and along the wall thickness direction of the first housing wall, a part of the second terminal plate is located between the protruding portion and the first housing wall, and the protruding portion is at least partially received in the step space formed by the first step portion; the first protruding portion further includes a first covering portion provided on the first insulating member, and along the wall thickness direction of the first housing wall, a part 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 received in the step space formed by the second step portion.

[0047] Thus, through the cooperation between the protruding portion and the first stepped portion, the bending deformation of the second electrode terminal can be restricted, and further at least part of the protruding portion can be received in the first stepped portion, so as to reduce the space occupied by the protruding portion and improve the space utilization rate. By providing the first covering portion, the creepage distance on the surfaces of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, by receiving the first covering portion in the stepped portion, the first covering portion does not occupy extra space, thereby improving the space utilization rate.

[0048] In some embodiments, along the wall thickness direction of the first housing wall, the surface of the first covering portion facing away from the first housing wall does not extend beyond the surface of the first terminal plate facing away from the housing wall; and / or, along the wall thickness direction of the first housing wall, the surface of the first covering portion facing away from the first housing wall does not extend beyond the surface of the second terminal plate facing away from the first housing wall.

[0049] Since the surface of the first covering portion facing away from the first housing wall does not extend beyond the surface of the first terminal plate and / or the surface of the second terminal plate facing away from the first housing 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 cell and even the battery pack in the wall thickness direction of the first housing wall; and to a certain extent, interference between the first covering portion and the bus bar is avoided, which facilitates the reliable connection of the bus bar and the like to the first terminal plate and the second terminal plate.

[0050] In some embodiments, along the wall thickness direction of the first housing wall, the height difference between the surface of the first terminal plate facing away from the housing wall and the surface of the second terminal plate facing away from the first housing wall is greater than or equal to 0 and does not exceed 0.5 mm.

[0051] Thus, the first terminal plate and the second terminal plate are nearly flush, which helps to share the external pressure together and improve the anti-deformation ability.

[0052] In some embodiments, the battery cell further includes a second insulating member, and at least part of the second insulating member is located between the second electrode terminal and the first housing wall.

[0053] This can insulate the second electrode terminal from the outer shell of the battery cell. Therefore, it can be applied not only to the design scheme with a live outer shell but also to the design scheme with a non-live outer shell.

[0054] In some embodiments, the first insulating member and the second insulating member are integrally formed.

[0055] This can reduce the number of components and simplify the assembly steps.

[0056] In some embodiments, a first recess and a second recess are formed in the first housing wall, and at least a part of the first insulating member and at least a part of the second insulating member are respectively located in the first recess and the second recess.

[0057] By causing at least a part of the first insulating member and at least a part of the second insulating member to sink into the recesses on the first housing wall, it is beneficial to improve the mounting strength of the insulating member relative to the first housing wall, reduce the possibility of the insulating member shifting along the surface of the first housing wall, and also facilitate the positioning of the insulating member and the first housing wall with respect to each other during assembly.

[0058] In some embodiments, the first recess and the second recess form the same recess.

[0059] Thereby, the number of components can be reduced and the assembly steps can be simplified.

[0060] In some embodiments, the first recessed portion is provided on a side of the second extending portion facing the first electrode terminal, and the first protruding portion is provided on a side of the first main body portion facing the second electrode terminal.

[0061] Thus, the first recessed portion provided on the second extending portion can be abutted by the first protruding portion provided on the first main body portion and fixed between the first protruding portion and the first housing wall, so that to a certain extent, it can prevent the second extending portion from tilting away from the first housing wall due to its relatively long extension, and improve the bending strength of the second extending portion and the entire second electrode terminal. Even if a pulling force is applied to the electrode terminal by a bus bar or the like, the electrode terminal is not easily bent or broken, improving the connection reliability between the bus bar and the electrode terminal.

[0062] In some embodiments, the first electrode terminal further has a second recessed portion, and the second electrode terminal further has a second protruding portion. The second protruding portion and the second recessed portion at least partially overlap in the wall thickness direction of the first housing wall. The second protruding portion and the second recessed portion cooperate with each other. The second recessed portion is provided on a side of the first extending portion facing the second electrode terminal, and the second protruding portion is provided on a side of the second main body portion facing the first electrode terminal.

[0063] Thus, through the cooperation of the second protruding portion and the second recessed portion, it is convenient to realize the support and fixation of the second electrode terminal to the first electrode terminal, improve the bending strength of the first electrode terminal, and is also convenient for processing; by arranging the second protruding portion in the second recessed portion, the space occupied by the second protruding portion can be reduced, improving the space utilization rate.

[0064] In some embodiments, the second recessed portion includes a third stepped portion and a fourth stepped portion, and the fourth stepped portion is disposed on a side of the third stepped portion away from the second electrode terminal; the second protruding portion includes an extending portion provided on the second electrode terminal, and along the wall thickness direction of the first housing wall, a part of the first electrode terminal is located between the extending portion and the first housing wall, and the extending portion is at least partially received in a stepped space formed by the third stepped portion; the second protruding portion further includes a second covering portion provided on the second insulating member, and along the wall thickness direction of the first housing wall, a part of the first electrode terminal is located between the second covering portion and the first housing wall, and the second covering portion is at least partially received in a stepped space formed by the fourth stepped portion.

[0065] Thus, through the cooperation between the extending portion and the third stepped portion, the bending deformation of the first electrode terminal can be restricted, and further, the extending portion is at least partially received in the third stepped portion to reduce the space occupied by the extending portion and improve the space utilization rate. By providing the second covering portion, the creepage distance on the surfaces of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, by receiving the second covering portion in the stepped portion, the second covering portion does not occupy extra space, thereby improving the space utilization rate.

[0066] In some embodiments, the minimum cross-sectional area for current to pass through in the extending portion is S1, and the capacity of the battery cell is P. Then, the ratio of S1 to P is in the range of 0.2 to 0.3, where the unit of the capacity is Ah.

[0067] Setting the ratio of S1 to P within a suitable range enables the extending portion to have a suitable overcurrent capacity.

[0068] In some embodiments, along the length direction of the first housing wall, the first extending portion and the second extending portion are located between the first main body portion and the second main body portion; along the width direction of the first housing wall, the first extending portion and the second extending portion have a first overlapping portion.

[0069] Thus, by arranging the first extending portion and the second extending portion to overlap in the width direction of the first housing wall, the bending strength of the region where the electrode terminals are arranged in the first housing wall 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 beneficial to the utilization of the non-electrode terminal arrangement region of the first housing wall, and further beneficial to improving the volume utilization rate of the battery pack.

[0070] 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.

[0071] Thus, the materials of the first main body part and the second main body part can be set according to the situation, which helps to reduce current loss, improve heat dissipation capacity, etc.

[0072] In some embodiments, the length of the first housing wall along the length direction of the first housing wall is L, and the length of the first overlapping part along the length direction of the first housing wall is A. Then A is in the range of 10% to 40% of L.

[0073] Thus, setting the first overlapping part to be relatively long is beneficial to improving the strength of the electrode terminal setting area in the first housing wall and even the entire first housing wall.

[0074] In some embodiments, the length of the first overlapping part along the length direction of the first housing wall is A, and A is in the range of 3 mm to 50 mm.

[0075] Thus, setting the first overlapping part to be relatively long is beneficial to improving the strength of the electrode terminal setting area in the first housing wall and even the entire first housing wall.

[0076] In some embodiments, along the length direction of the first housing wall, the first main body part and the second main body part have a second overlapping part.

[0077] Thus, since there are overlapping parts in both the length direction and the width direction of the first housing wall, the first electrode terminal and the second electrode terminal can be compactly arranged in both the length direction and the width direction of the first housing wall, and the bending strength of the first housing wall can be further improved.

[0078] In some embodiments, the dimension of the first housing wall along the width direction of the first housing wall is W, and the length of the second overlapping part along the width direction of the first housing wall is B. Then B is in the range of 20% to 90% of W.

[0079] Thus, setting the length dimension of the second overlapping area along the width direction of the first housing wall to be relatively long is beneficial to enhancing the strengthening effect on the strength of the first housing wall.

[0080] In some embodiments, along the length direction and the width direction of the first housing wall, the shortest distance between the first electrode terminal and the second electrode terminal is greater than or equal to 0.3 mm. Thus, the possibility of the first electrode terminal and the second electrode terminal being short-circuited with each other can be reduced.

[0081] In some embodiments, the first electrode terminal includes a first terminal plate, and the second electrode terminal includes a second terminal plate. Both the first terminal plate and the second terminal plate include connection regions for connecting to a bus bar. The bus bar is used to electrically connect a plurality of the battery cells to each other. The connection regions are formed at least in the first overlapping portion.

[0082] Thus, the bus bar is connected to the portions of the first electrode terminal and the second electrode terminal that form the first overlapping portion. Since this portion has a relatively high bending strength, 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 break due to bending deformation.

[0083] In some embodiments, the connection regions are also formed in at least one of the first main body portion and the second main body portion.

[0084] Thereby, the connection strength between the electrode terminal and the bus bar can be further enhanced, the bending stress caused by the bus bar can be further dispersed, and the anti-deformation ability of the electrode terminal and the first housing wall can be further improved.

[0085] In some embodiments, the area of the connection region in the first overlapping portion is SA, and the area of all the connection regions is S. Then, SA accounts for 50% to 100% of S.

[0086] Thus, on the basis of being provided in the extension portion, the connection regions can also be provided in the non-extension portion region. The flexibility of the setting of the connection regions is relatively high, which helps to increase the area of the connection regions, enhance the connection strength, and increase the current-carrying area.

[0087] In some embodiments, the offset distance of the center line position of the connection region formed in the first extension portion in the width direction of the first housing wall relative to the center line position of the first housing wall in the width direction of the first housing wall is B3. Then, B3 is in the range of 15% to 27% of W.

[0088] By setting B3 to be not less than 15% of W, the first extension portion has a sufficient distance from the center, which helps to ensure that there is a sufficient safety distance between the first extension portion and the second extension portion. By setting B3 to be not greater than 27% of W, the first extension portion can have a certain distance from the edge of the first housing wall.

[0089] In some embodiments, 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 along the wall thickness direction of the first housing wall, and the first protruding portion and the first recessed portion cooperate with each other.

[0090] Therefore, through the cooperation between the first protrusion and the first recessed portion, it is easy to support and fix the second electrode terminal by the first electrode terminal, improve the bending strength of the second electrode terminal, and facilitate processing; by arranging the first protrusion in the first recessed portion, the space occupied by the first protrusion is reduced, thereby improving space utilization.

[0091] In some embodiments, the electrode terminal includes a first electrode terminal and a second electrode terminal, the first electrode terminal includes a first terminal plate, at least a portion of the first terminal plate is disposed on a side of the first shell wall away from the accommodating space, the second electrode terminal includes a second terminal plate, the second terminal plate is disposed on a side of the first shell wall away from the accommodating space, along the wall thickness direction of the first shell wall, the first terminal plate partially overlaps with the second terminal plate, and the first terminal plate directly or indirectly abuts against the second terminal plate.

[0092] Therefore, 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; moreover, the first terminal plate and the second terminal plate can also be electrically connected to each other, which is convenient for simplifying the connection structure when the two electrode terminals have the same polarity.

[0093] In some embodiments, the electrode terminal includes a first electrode terminal and a second electrode terminal, the first electrode terminal includes a first terminal plate, at least a portion of the first terminal plate is arranged on a side of the first shell wall away from the accommodating space, the first terminal plate includes a first main body and a first extension portion connected to each other, the second electrode terminal includes a second terminal plate, the second terminal plate is arranged on a side of the first shell wall away from the accommodating space, the second terminal plate includes a second main body and a second extension portion connected to each other, 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 and the second main body, and the first extension portion and the second extension portion are arranged along the width direction of the first shell wall.

[0094] By designing the terminal board to be larger, the heat dissipation, the supporting effect on the first housing wall, and the connection strength with the busbar can be improved, and the shape design freedom of each terminal board is high.

[0095] In some embodiments, along the wall thickness direction of the first shell wall, the overlapping portion of the first electrode terminal and the second electrode terminal 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 in the range of 10% to 90% of W.

[0096] Thus, the first housing wall can be fully utilized in the width direction of the first housing wall, the supporting force between the first electrode terminal and the second electrode terminal can be surely improved, the bending strength of the electrode terminal can be increased, and the strength of the first housing wall around the electrode terminal can also be enhanced.

[0097] In some embodiments, W11 ranges from 0.5 mm to 50 mm.

[0098] Thus, the size of the overlapping region in the width direction of the first housing wall can be determined according to the size of the first housing wall in the width direction of the first housing wall. By setting the size of the overlapping region in the width direction of the first housing wall to be relatively large, the supporting force between the first electrode terminal and the second electrode terminal can be improved, the bending strength of the electrode terminal can be increased, and the strength of the first housing wall around the electrode terminal can also be enhanced.

[0099] In some embodiments, the length of the overlapping region in the length direction of the first housing wall is L11, and L11 ranges from 0.5 mm to 6 mm.

[0100] Thus, by setting the length of the overlapping region in the length direction of the first housing wall to be relatively small, the fitting strength between the protruding portion and the recessed portion can be improved, and it is also beneficial to improve the space utilization rate.

[0101] In some embodiments, along the width direction of the first housing wall, the first extension portion is offset from the central position of the first main portion; and / or, along the width direction of the first housing wall, the second extension portion is offset from the central position of the second main portion.

[0102] Thus, the size of the first housing wall in the width direction of the first housing wall can be fully utilized to arrange the first extension portion and the second extension portion in the width direction of the first housing wall, which is beneficial to the compact arrangement of the first electrode terminal and the second electrode terminal.

[0103] In some embodiments, the length of the first housing wall is less than or equal to 450 mm.

[0104] Thus, the electrode terminals can be arranged by making full use of the relatively narrow side walls of the strip-shaped battery cells, the flexibility of battery cell grouping is improved, and large-area heat dissipation is also facilitated.

[0105] The second aspect of the present application provides a battery, including: a box body and at least two battery cells according to the first aspect.

[0106] Since the battery adopts the battery cell as described above, the heat dissipation capacity of the electrode terminals in the battery cell is improved, and the service performance of the battery is improved.

[0107] In some embodiments, each of the battery cells is arranged along the width direction of the first housing wall.

[0108] Thereby, it is beneficial to improve the volume utilization rate of the battery.

[0109] In some embodiments, the first electrode terminal includes a first electrode terminal, 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, along the length direction of the first housing wall, at least part of the first extension portion and at least part of the second extension portion are located between the first main body portion and the second main body portion, in adjacent battery cells, the first extension portion of one battery cell and the second extension portion of another battery cell are arranged along the width direction and are electrically connected through a bus bar.

[0110] 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 this connection part is relatively strong. Therefore, the first electrode terminal, the second electrode terminal and the first housing wall are not easily bent, deformed or broken, thereby improving the use reliability of the battery.

[0111] In some embodiments, in the same battery cell, along the width direction of the first housing wall, the first extension portion and the second extension portion have a first overlapping portion, in adjacent battery cells, the first overlapping portion of one battery cell and the first overlapping portion of another battery cell are electrically connected through the bus bar.

[0112] Thereby, the bus bar is connected to the portion where the first overlapping portion is formed in the first electrode terminal and the second electrode terminal. Since this portion has a relatively strong bending resistance, 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 less likely to break due to bending deformation, thereby improving the use reliability of the battery.

[0113] In some embodiments, at least one box wall of the box body has a boss, the boss is formed by the box wall bulging towards the direction away from the battery cell, the boss forms a receiving portion on the side facing the battery cell, along the direction perpendicular to the box wall where the boss is formed, the projections of the first electrode terminal and the second electrode terminal do not exceed the projection of the boss, and at least part of the first electrode terminal and / or the second electrode terminal is received in the receiving portion.

[0114] Thus, it is possible to increase only the height of the box body at the positions of the first electrode terminal, the second electrode terminal, and the bus bar, thereby being able to suppress the size of the battery and being beneficial to improving the volume utilization rate of the battery.

[0115] The third aspect of the present application provides an electrical device, which includes a plurality of battery cells provided in the first aspect or batteries provided in the second aspect above, and the battery cells or the batteries supply power to the electrical device.

[0116] Thus, it is possible to provide an electrical device having battery cells or batteries with strong heat dissipation ability of electrode terminals, and improve the performance of the electrical device.

[0117] The fourth aspect of the present application provides an energy storage device, which includes a plurality of battery cells provided in the first aspect or batteries provided in the second aspect above, and the battery cells or the batteries are used to store electrical energy and can supply electrical energy.

[0118] Thus, it is possible to provide an energy storage device having battery cells or batteries with strong heat dissipation ability of electrode terminals, and improve the performance of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0119] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0120] Figure 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0121] Figure 2 is a schematic structural diagram of an energy storage device provided in an embodiment of the present application;

[0122] Figure 3 is a three-dimensional exploded view of a battery provided in an embodiment of the present application;

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

[0124] Figure 5 is a top view of a battery cell provided in an embodiment of the present application;

[0125] Figure 6 is a top view of a battery cell provided in another embodiment of the present application;

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

[0127] Figure 8 Exploded view diagram of the electrode terminal provided by another embodiment of the present application;

[0128] Figure 9 Structural diagram of a plurality of battery cells grouped together provided by an embodiment of the present application;

[0129] Figure 10 Front view diagram of a plurality of battery cells grouped together provided by an embodiment of the present application;

[0130] Figure 11 Provided by an embodiment of the present application Figure 10 Cross-sectional view A-A in;

[0131] Figure 12 Top view diagram of a battery cell provided by yet another embodiment of the present application;

[0132] Figure 13 Along Figure 12 Cross-sectional view B-B in;

[0133] Figure 14 For Figure 13 Partial enlarged view of part C in;

[0134] Figure 15 Structural diagram of a plurality of battery cells grouped together provided by another embodiment of the present application;

[0135] Figure 16 Stereo exploded view diagram of a battery cell provided by another embodiment of the present application;

[0136] Figure 17 Cross-sectional view of a battery with a boss provided by an embodiment of the present application;

[0137] Figure 18 For Figure 13 Partial enlarged view of part C1 in;

[0138] Figure 19 For Figure 12 Cross-sectional view D-D in;

[0139] Figure 20 For Figure 19 Partial enlarged view of part D1 in;

[0140] Figure 21 Top view diagram of a battery cell provided by yet another embodiment of the present application.

[0141] Explanation of reference numerals

[0142] 1000 Vehicle; 2000 Energy storage device; 100 Battery; 200 Controller; 300 Motor; 400 Control unit; 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 plate; 312 First connection post; 314 First protrusion; 32 Second electrode terminal; 321 Second terminal plate; 322 Second connection post; 325 Third connection post; 315 First depression; 3151 First step; 3152 Second step; 316 Second depression; 3161 Third step; 3162 Fourth step; 317 Second protrusion; 4 Terminal board; 41 First terminal board; 42 Second terminal board; 5 Main body; 51 First main body; 52 Second main body; 6 Extension; 61 First extension; 62 Second extension; 63 Third extension; 64 Fourth extension; 7 Electrode assembly: 71 First tab; 72 Second tab; 81 First insulator; 82 Second insulator; 811 First covering; 812 Second covering; 91 First overlapping part; 93 Connection area; 111a Boss; 111b Receiving part; X Length direction of the first housing wall; Y Width direction of the first housing wall; Z Wall thickness direction of the first housing wall. Detailed implementation manners

[0143] It should be noted that, without conflict, the embodiments and technical features in the embodiments of the present application may be combined with each other. The detailed descriptions in the specific implementation manners should be understood as the explanatory description of the purpose of the present application, and should not be regarded as an improper limitation of the present application.

[0144] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and drawings of this application are intended to cover non-exclusive inclusion.

[0145] In the description of this application, technical terms such as "first", "second", "third", "fourth", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of this application, "a plurality of" means more than two, unless otherwise specifically defined.

[0146] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0147] In the description of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0148] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0149] In the description of this application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0150] In the description of this application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact or contact through an intermediate medium layer. It can be contact with essentially no interaction force between the two contacting parties, or it can be contact with interaction force between the two contacting parties.

[0151] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical terms "parallel" and "perpendicular" are both allowed to have a certain degree of tolerance and / or error, including the situations of being approximately parallel and approximately perpendicular.

[0152] Below, this application is described in detail.

[0153] In the existing battery system, a battery includes an electrode assembly and an electrode terminal. The electrode assembly realizes the power supply function through the electrical connection between the tab and the electrode terminal. The heat at the welding joint between the tab and the electrode terminal and the welding joint inside the electrode terminal is mainly transferred to the outside through the electrode terminal. As people's requirements for battery fast charging technology are getting higher and higher, the heat dissipation requirements for the electrode terminal are also getting higher and higher. How to improve the heat dissipation effect of the electrode terminal is one of the research topics in the industry.

[0154] In the related art, there is a solution to specifically provide a cooling structure for the electrode terminal, but it has disadvantages such as large occupied space and complex structure. Therefore, it is desired to provide a battery cell that can improve the heat dissipation ability of the electrode terminal and does not change the original outer contour size of the battery as much as possible. Through research, it can be made that the electrode terminal protrudes locally, increasing the circumferential perimeter of the electrode terminal, so as to increase the contact area between the electrode terminal and the air, thereby increasing the heat dissipation area and improving the heat dissipation ability of the electrode terminal, and further improving the performance of the battery cell.

[0155] Based on such a design concept, the present application designs a battery cell, which includes: a housing having an accommodation space, the housing including a first housing wall; an electrode assembly disposed in the accommodation space; and an electrode terminal disposed on the first housing wall. The electrode terminal has a terminal plate for connecting with a bus bar. The terminal plate includes a main body portion and at least one extension portion connected to the main body portion. Along the wall thickness direction perpendicular to the first housing wall, at least one extension portion protrudes from the main body portion.

[0156] The extension portion protruding from the main body portion along the wall thickness direction perpendicular to the first housing wall can increase the contact area between the terminal plate and the air, thereby increasing the contact area between the electrode terminal and the air, increasing the heat dissipation area, improving the heat dissipation performance of the electrode terminal, and further improving the performance of the battery cell. The battery cell provided by the embodiment of the present application can be used in, but is not limited to, power-consuming devices such as energy storage devices, vehicles, ships, or aircraft.

[0157] The battery cells provided by the embodiments of the present application can also be grouped into a battery (sometimes also referred to as a battery pack) for use. The battery can also be used in, but is not limited to, power-consuming devices such as energy storage devices, vehicles, ships, or aircraft.

[0158] The embodiments of the present application also provide a power-consuming device including the above-mentioned battery cell or battery. The power-consuming device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0159] The embodiments of the present application further provide an energy storage device including the above battery cell or battery. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0160] For the convenience of description, the electrical device in an embodiment of the present application is taken as an example of a vehicle 1000 for illustration. The following is described with reference to the accompanying drawings.

[0161] Figure 1 It is a schematic structural diagram of a vehicle provided by an embodiment of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. As Figure 1 shown, a battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom, head or 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 source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0162] In some embodiments of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0163] Figure 2 It is a schematic structural diagram of an energy storage device 2000 provided by some embodiments of the present application. The energy storage device 2000 can be an energy storage container or an energy storage cabinet, etc. As Figure 2 shown, the energy storage device 2000 may include a battery 100 and a control unit 400. The control unit 400 is used to control the charge and discharge of the battery 100 to ensure the normal operation of the battery 100. For example, it is used to monitor parameters such as ambient temperature and humidity.

[0164] Figure 3 It is a schematic exploded view of the structure of a battery provided by an embodiment of the present application. As Figure 3 shown, the battery 100 includes a box body 20. The box body 20 can be divided into an upper box body 20A and a lower box body 20B. The upper box body 20A and the lower box body 20B are mutually opposed to form an arrangement space for battery cells 10 therebetween.

[0165] In the battery 100, there may be multiple battery cells 10. The multiple battery cells 10 can be connected in series, parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 can be directly connected in series, parallel, or in a combined series-parallel connection, and then 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 in the form that multiple battery cells 10 are first connected in series, parallel, or in a combined series-parallel connection to form battery modules, and then multiple battery modules are connected in series, parallel, or in a combined series-parallel connection to form a whole and are accommodated in the arrangement space defined by the upper box body 20A and the lower box body 20B. The battery 100 can also include other structures. For example, the battery 100 can also include a bus bar ( Figure 3 not shown in the figure) for realizing the electrical connection among the multiple battery cells 10.

[0166] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so as to be used continuously.

[0167] 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0168] Next, some embodiments of the present application will be described in detail in conjunction with Figures 4 to 21 the accompanying drawings.

[0169] Figure 4 FIG. is a three-dimensional exploded view of a battery cell provided in an embodiment of the present application; Figure 5 FIG. is a top view of a battery cell provided in an embodiment of the present application; Figure 6 FIG. is a top view of a battery cell provided in another embodiment of the present application; Figure 7 FIG. is a top view of a battery cell provided in yet another embodiment of the present application; Figure 8 FIG. is an exploded view of an electrode terminal provided in yet another embodiment of the present application; Figure 9 FIG. is a schematic structural diagram of a group of multiple battery cells provided in an embodiment of the present application; Figure 10 FIG. is a front view of a group of multiple battery cells provided in an embodiment of the present application; Figure 11 FIG. provided in an embodiment of the present application is Figure 10 the A-A cross-sectional view; Figure 12 FIG. is a top view of a battery cell provided in yet another embodiment of the present application; Figure 13 FIG. is a cross-sectional view along Figure 12 B-B in the figure; Figure 14 FIG. is Figure 13 a partial enlarged view of part C in the figure; Figure 15Schematic diagram of the structure of a plurality of battery cells grouped together provided in another embodiment of the present application; Figure 16 Stereo exploded view of a battery cell provided in another embodiment of the present application; 17 is a cross-sectional view of a battery with a boss provided in one embodiment of the present application; Figure 18 For Figure 13 Partial enlarged view of part C1 in; Figure 19 For Figure 12 Cross-sectional view taken along D-D in; Figure 20 For Figure 19 Partial enlarged view of part D1 in; Figure 21 Top view of a battery cell provided in yet another embodiment of the present application.

[0170] In the description of the embodiments of the present application, for the convenience of description, the direction of arrow X is used to represent "the length direction of the first housing wall" and "the length direction of the battery cell", the direction of arrow Y is used to represent "the width direction of the first housing wall" and "the thickness direction of the battery cell", and the direction of arrow Z is used to represent "the wall thickness direction of the first housing wall" and "the height direction of the battery cell".

[0171] The first aspect of the present application provides a battery cell 10. The battery cell 10 includes: a housing 1 having an accommodation space 12, the housing 1 including a first housing wall 11; an electrode assembly 7 disposed at least partially in the accommodation space 12; and an electrode terminal 3 disposed on the first housing wall 11. The electrode terminal 3 has a terminal plate 4 for connecting to a bus bar 2. The terminal plate 4 includes a main body portion 5 and at least one extension portion 6 connected to the main body portion 5. Along the direction Z perpendicular to the wall thickness of the first housing wall, at least one extension portion 6 protrudes from the main body portion 5.

[0172] As Figure 4 As shown, the battery cell 10 includes a housing 1 having a plurality of housing walls. For the convenience of description, one of the housing walls is named the first housing wall 11. The battery cell 10 further includes an electrode assembly 7 located in an accommodation space 12 surrounded by the plurality of housing walls.

[0173] In some embodiments, as Figure 4 As shown, the battery cell 10 includes an electrode assembly 7. The electrode assembly 7 includes a positive electrode plate, a negative electrode plate, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode plate and the negative electrode plate, which can prevent short circuit between the positive and negative electrodes and allow active ions to pass through. In Figure 4 In the embodiment shown, as the electrode assembly 7, two stacked wound bodies formed by stacking and winding a positive electrode plate, a negative electrode plate, and a separator are shown. However, the electrode assembly 7 is not limited to Figure 4The winding type shown can also be, for example, a stacked type or other structural forms.

[0174] The electrode assembly 7 is provided with tabs, and the tabs can conduct current out of the electrode assembly 7. The tabs include a positive tab and a negative tab. In Figure 4 the specific embodiment shown, the electrode assembly 7 is shown to have a first tab 71 and a second tab 72. The first tab 71 and the second tab 72 are arranged on one side of the electrode assembly 7 along the wall thickness direction Z of the first housing wall and are respectively arranged near the two end portions of the electrode assembly 7 along the length direction X of the first housing wall. Of course, the first tab 71 and the second tab 72 can also be arranged on both sides of the electrode assembly 7; the first tab 71 and the second tab 72 can also be arranged near one end portion of the electrode assembly 7 along the length direction X of the first housing wall.

[0175] In some embodiments, the battery cell 10 includes a housing 1. The housing 1 is used to encapsulate components such as the electrode assembly 7 and the electrolyte. The housing 1 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0176] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing plays a role in protecting the electrode assembly, and a sealed bag is further included between the housing and the electrode assembly. The sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag can be a bag-shaped insulating part or an aluminum-plastic film. As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. In Figures 4 to 20 the embodiment shown, for the convenience of description, a square-shell battery cell is taken as an example for description.

[0177] In some embodiments, as Figure 4 shown, the housing 1 includes a plurality of housing walls, and a part of the housing walls enclose a space with an opening. The opening can be closed by other housing walls (such as the first housing wall 11) to form an accommodation space 12 for accommodating substances such as the electrode assembly 7 and the electrolyte. The housing 1 can be provided with one or more openings. The housing wall (such as the first housing wall 11) closing the opening can also be configured as a top cover.

[0178] As Figures 4 to 7As shown, the battery cell 10 also includes an electrode terminal 3, which is arranged on the first shell wall 11. The electrode terminal 3 imports or exports the current in the electrode assembly 7 by connecting with the electrode assembly 7. The electrode terminal 3 has a terminal board 4, which is used to connect with the busbar 2. The busbar 2 can realize the electrical connection between the battery cells. The terminal board 4 includes a main body 5 and at least one extension part 6. The main body 5 is connected to each extension part 6. Along the wall thickness direction Z perpendicular to the first shell, at least one extension part 6 protrudes from the main body 5.

[0179] In some embodiments, the electrode terminal 3 may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab via a transition component. For ease of description, in the embodiment of the present application, the housing wall where the electrode terminal 3 is located is referred to as the first housing wall 11 .

[0180] Optionally, the electrode terminal 3 may be one, two, three or four, etc. When there is one electrode terminal 3, the electrode terminal 3 may be the positive electrode and the housing 1 may be the negative electrode. The electrode terminal 3 may be located at the center of the first housing wall 11, or at one end of the first housing wall 11 along the length direction X of the first housing wall, or at one end of the first housing wall 11 along the width direction Y of the first housing wall. There is no special restriction on the specific location of the electrode terminal 3 in the first housing wall 11, as long as the electrical connection between the electrode terminal 3 and the pole ear can be achieved. In a specific embodiment, as Figure 5 As shown, the electrode terminal 3 is located at one end of the first housing wall 11 along the length direction X of the first housing wall.

[0181] like Figure 9 As shown, the connection between the terminal board 4 and the busbar 2 is an electrical connection. Optionally, the terminal board 4 can be directly connected to the busbar 2, or indirectly connected to the busbar 2; the main body 5 in the terminal board 4 can be connected to the busbar 2, or the extension 6 in the terminal board 4 can be connected to the busbar 2, or both the main body 5 and the extension 6 in the terminal board 4 can be connected to the busbar 2.

[0182] like Figures 5 to 7 As shown, in some embodiments, the busbar 2 may be arranged on the surface of the terminal board 4, such as Figures 5 to 7 The shaded area in the middle is the welding area of ​​the busbar. First, the bar piece can connect the battery cells 10. Second, the bar piece can also play the role of current distribution. In addition, the bar piece also plays the role of temperature detection and conduction. The bar piece can enhance the heat dissipation capacity of the battery cell 10 by designing a reasonable heat dissipation solution, thereby reducing the temperature of the battery cell 10 and improving the performance of the battery cell 10.

[0183] Optionally, the main body portion 5 and the extension portion 6 may be of an integral structure or a split structure; when the main body portion 5 and the extension portion 6 are of a split structure, the main body portion 5 and the extension portion 6 may be directly connected or indirectly connected, and the materials of the main body portion 5 and the extension portion 6 may be the same or different.

[0184] As Figure 4 shown, when the outer surface of the first housing wall 11 is a planar structure, the plane formed by the length direction X of the first housing wall and the width direction Y of the first housing wall is parallel to the outer surface of the first housing wall 11. Sometimes, the width direction Y of the first housing wall is also referred to as the thickness direction of the battery cell 10. Of course, the outer surface of the first housing wall 11 may also be a curved surface.

[0185] Optionally, the extension portion 6 may be one or more. Taking Figure 5 the orientation shown as an example, the extension portion 6 may protrude from the main body portion 5 along one side or the other side of the length direction X of the first housing wall with respect to the main body portion 5; the extension portion 6 may also protrude from the main body portion 5 along one side or the other side of the width direction Y of the first housing wall with respect to the main body portion 5; when there are multiple extension portions 6, some of the extension portions 6 may protrude from the main body portion 5 along one side or the other side of the length direction X of the first housing wall with respect to the main body portion 5, and the other part of the extension portions 6 may protrude from the main body portion 5 along one side or the other side. Of course, the extension portion 6 may also extend relative to the main body portion 5 in other directions. For example, the extension portion 6 may protrude relative to the main body portion 5 along the intermediate direction between the length direction X of the first housing wall and the width direction Y of the first housing wall (such as Figure 5 the upper left side direction in). There are no specific restrictions on the number, shape, and size of the extension portion 6 and the main body portion 5. The extension directions of the multiple extension portions 6 may be the same or different.

[0186] Optionally, the shape of the extension portion 6 may be a cylinder, a cuboid, a prism, or other regular or irregular shapes; the shape of the main body portion 5 may be a cylinder, a cuboid, a prism, or other regular or irregular shapes. The shapes of the extension portion 6 and the main body portion 5 may be the same or different. In a specific embodiment, the extension portion 6 and the main body portion 5 are cuboids with different sizes.

[0187] The extension portion 6 protruding from the main body portion 5 along the wall thickness direction perpendicular to the first housing wall can increase the contact area between the terminal plate 4 and the air, thereby increasing the contact area between the electrode terminal 3 and the air, increasing the heat dissipation area, improving the heat dissipation performance of the electrode terminal 3, and further improving the service performance of the battery cell 10.

[0188] In some embodiments, along the length direction X of the first housing wall, the extension portion 6 protrudes from the main body portion 5, and the length of the extension portion 6 is greater than the length of the main body portion 5.

[0189] As Figures 5 to 7 shown, along the length direction X of the first housing wall, the extension portion 6 protrudes from the main body portion 5, and the length of the extension portion 6 along the length direction X of the first housing wall is greater than the length of the main body portion 5 along the length direction X of the first housing wall.

[0190] Optionally, the extension portion 6 may protrude from one side of the main body portion 5 along the length direction X of the first housing wall (such as Figure 5 the left side of the main body portion 5 in Figure 5 ), and the extension portion 6 may also protrude from the other side of the main body portion 5 along the length direction X of the first housing wall (such as

[0191] the right side of the main body portion 5 in

[0192] The length of the extension portion 6 along the length direction X of the first housing wall is greater than the length of the main body portion 5 along the length direction X of the first housing wall. The specific dimensions of the extension portion 6 are not limited herein, as long as it can be processed and achieve the heat dissipation effect.

[0193] Thus, it is possible to increase the length of the extension portion 6 along the length direction X of the first housing wall, increase the circumferential perimeter of the terminal plate 4, increase the contact area between the terminal plate 4 and the air, thereby increasing the heat dissipation area, improving the heat dissipation capacity of the electrode terminal 3, and further improving the performance of the battery cell 10.

[0194] As Figures 5 to 7 shown, the battery cell 10 includes a first electrode terminal 31 and a second electrode terminal 32. The first electrode terminal 31 includes a first main body portion 51 and a first extension portion 61, and the second electrode terminal 32 includes a second main body portion 52 and a second extension portion 62. In some specific embodiments, the first electrode terminal 31 has a first terminal plate 41, and the first terminal plate 41 includes a first main body portion 51 and a first extension portion 61. In some other specific embodiments, the second electrode terminal 32 has a second terminal plate 42, and the second terminal plate 42 has a second main body portion 52 and a second extension portion 62.

[0195] Optionally, the first extension portion 61 and the second extension portion 62 may respectively protrude from their respective main body portions 5 along the length direction X of the first housing wall and extend toward the side closer to each other (with opposite extension directions). Optionally, the first extension portion 61 and the second extension portion 62 may also respectively protrude from their respective main body portions 5 along the length direction X of the first housing wall and extend toward the same side.

[0196] In some embodiments, the first electrode terminal 31 and the second electrode terminal 32 may be respectively located at both ends or the middle position along the length direction X of the first housing wall 11; the first electrode terminal 31 and the second electrode terminal 32 may both be located at one end along the length direction X of the first housing wall 11; alternatively, one of the electrode terminals 3 may be located at the middle position along the length direction X of the first housing wall 11, and the other electrode terminal 3 may be located at the end position along the length direction X of the first housing wall 11; the first electrode terminal 31 and the second electrode terminal 32 may also 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 have no restrictive effect on this application. Of course, the first electrode terminal 31 and the second electrode terminal 32 may also be located at other positions on the first housing wall 11. In Figure 16 the illustrated embodiment, the first electrode terminal 31 and the second electrode terminal 32 are both located at approximately the middle position along the length direction X of the first housing wall 11.

[0197] The shapes of the first electrode terminal 31 and the second electrode terminal 32 may be the same or different. The first electrode terminal 31 may have one, two, three, or four extension portions, etc.; the second electrode terminal 32 may have one, two, three, or four extension portions, etc., and the number of extension portions 6 of the first electrode terminal 31 and the second electrode terminal 32 may be the same or different.

[0198] In a specific embodiment, as Figure 7 shown, the first electrode terminal 31 and the second electrode terminal 32 have the same shape, and each of the first electrode terminal 31 and the second electrode terminal 32 has an extension portion extending along the length direction X of the first housing wall. The first electrode terminal 31 and the second electrode terminal 32 are arranged opposite to each other along the length direction X of the first housing wall. Of course, the first electrode terminal 31 and the second electrode terminal 32 may also be arranged toward the same side (such as Figure 7 the left or right side in Figure 6As shown, the first electrode terminal 31 and the second electrode terminal 32 have the same shape. Each of the first electrode terminal 31 and the second electrode terminal 32 has two extension parts extending along the length direction X of the first housing wall. The first electrode terminal 31 and the second electrode terminal 32 are arranged opposite to each other along the length direction X of the first housing wall. Of course, the first electrode terminal 31 and the second electrode terminal 32 can also be arranged towards the same side (such as Figure 6 the left or right side in

[0199] In another specific embodiment, as Figure 5 shown, the shapes of the first electrode terminal 31 and the second electrode terminal 32 are different. The first electrode terminal 31 has one extension part, and the second electrode terminal 32 has two extension parts. The first electrode terminal 31 and the second electrode terminal 32 are arranged opposite to each other along the length direction X of the first housing wall. Of course, the first electrode terminal 31 and the second electrode terminal 32 can also be arranged towards the same side along the length direction X of the first housing wall. The above embodiments are only examples of the shapes of the first electrode terminal 31 and the second electrode terminal 32 and their placement on the first housing wall 11, and have no restrictive effect on this application.

[0200] The electrode terminal 3 is provided with at least two, which can increase the contact area between the electrode terminal 3 and the air, improve the heat dissipation capacity of the electrode terminal 3, and further improve the service performance of the battery cell 10. There are various extension directions of the first extension part and the second extension part, which improves the flexibility of the arrangement of the first extension part and the second extension part.

[0201] In some embodiments, the first extension part 61 and the second extension part 62 extend towards the side close to each other along the length direction X of the first housing wall; or, the first extension part 61 and the second extension part 62 extend towards the same side along the length direction X of the first housing wall.

[0202] Such as Figures 5 to 7 shown, the first extension part 61 and the second extension part 62 extend towards the side close to each other along the length direction X of the first housing wall. Taking the orientation shown as an example, the first electrode terminal 31 and the second electrode terminal 32 are arranged along the length direction X of the first housing wall with the first extension part 61 and the second extension part 62 arranged close to each other. The first extension part 61 protrudes and extends towards the second main body part 52 (such as Figure 5 the right side of the first main body part 51 in Figure 5 along the length direction X of the first housing wall relative to the first main body part 51, and the second extension part 62 protrudes and extends towards the first main body part 51 (such as Figure 5extends convexly to the left side of the second main body portion 52). Of course, the first electrode terminal 31 and the second electrode terminal 32 can also be arranged along one side or the other side of the length direction X of the first housing wall and the width direction Y of the first housing wall, which will not be elaborated here.

[0203] In some other embodiments, the first extension portion 61 and the second extension portion 62 extend towards the same side along the length direction X of the first housing wall, so as to Figure 5 Taking the illustrated orientation as an example, the first electrode terminal 31 and the second electrode terminal 32 are arranged along the length direction X of the first housing wall with the first extension portion 61 and the second extension portion 62 facing the same direction. The first extension portion 61 extends convexly away from the second extension portion 62 along the length direction X of the first housing wall relative to the first main body portion 51 ( Figure 5 to the left side of the first main body portion 51 in ), and the second extension portion 62 extends convexly towards the first main body portion 51 along the length direction X of the first housing wall relative to the second main body portion 52 ( Figure 5 to the left side of the second main body portion 52 in ); it is also possible that the first extension portion 61 extends convexly towards the second extension portion 62 along the length direction X of the first housing wall relative to the first main body portion 51 ( Figure 5 to the right side of the first main body portion 51 in ), and the second extension portion 62 extends convexly away from the first main body portion 51 along the length direction X of the first housing wall relative to the second main body portion 52 ( Figure 5 to the right side of the second main body portion 52 in ).

[0204] There are various extension directions for the first extension portion 61 and the second extension portion 62, which improves the flexibility of the arrangement of the first extension portion 61 and the second extension portion 62.

[0205] In some embodiments, the terminal board further includes a plurality of extension portions.

[0206] The extension portion can be one extension portion, two extension portions or more extension portions. As Figure 6 shown, the first terminal board 41 includes a first extension portion 61 and a third extension portion 63 extending from the first main body portion 51. The third extension portion 63 can extend along one side or the other side of the length direction X of the first housing wall and one side or the other side of the width direction Y of the first housing wall relative to the first main body portion 51. The extension directions of the third extension portion 63 and the first extension portion 61 can be the same or different. The third extension portion 63 can be a cylinder, a cuboid, a prism, or other regular or irregular shapes. The shapes of the first extension portion 61 and the third extension portion 63 can be the same or different. In a specific embodiment, the first extension portion 61 and the third extension portion 63 are cuboids, and the extension directions of the first extension portion 61 and the third extension portion 63 are both the length direction X of the first housing wall.

[0207] AsFigure 6 As shown, the second terminal plate 42 includes a second extension portion 62 and a fourth extension portion 64 extending from the second main body portion 52. The fourth extension portion 64 can extend along one side or the other side of the first housing wall in the length direction X or along one side or the other side of the first housing wall in the width direction Y relative to the second main body portion 52. The extending directions of the fourth extension portion 64 and the second extension portion 62 can be the same or different. The fourth extension portion 64 can be a cylinder, a cuboid, a prism, or other regular or irregular shapes. The shapes of the fourth extension portion 64 and the second extension portion 62 can be the same or different. In a specific embodiment, the second extension portion 62 and the fourth extension portion 64 are cuboids, and the extending directions of both the second extension portion 62 and the fourth extension portion 64 are the length direction X of the first housing wall.

[0208] One terminal plate 4 is provided with at least two extension portions 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 further improve the service performance of the battery cell 10.

[0209] In some embodiments, multiple extension portions extend from the main body portion 5 toward the same side along the length direction X of the first housing wall.

[0210] Multiple extension portions can extend toward the same side or toward opposite sides along the length direction X of the first housing wall. As Figures 5 to 7 shown, the third extension portion 63 and the first extension portion 61 extend toward the same side or opposite sides along the length direction X of the first housing wall. Taking the Figure 6 shown orientation as an example, the third extension portion 63 and the first extension portion 61 extend toward the same side along the length direction X of the first housing wall. The third extension portion 63 and the first extension portion 61 can extend along the length direction X of the first housing wall toward one side ( Figure 6 the left side of the first main body portion 51 in Figure 6 ) relative to the first main body portion 51, or the third extension portion 63 and the first extension portion 61 can also extend along the length direction X of the first housing wall toward the other side ( Figure 6 the right side of the first main body portion 51 in Figure 6 ) relative to the first main body portion 51. The third extension portion 63 and the first extension portion 61 can extend along opposite sides of the length direction X of the first housing wall, that is, one of the third extension portion 63 and the first extension portion 61 extends along the length direction X of the first housing wall toward one side ( Figure 6 the left side of the first main body portion 51 in Figure 6 ) relative to the first main body portion 51, and the other extends along the length direction X of the first housing wall toward the other side ( Figure 6 the right side of the first main body portion 51 in

[0211] As Figures 5 to 7As shown, the fourth extension portion 64 and the second extension portion 62 extend towards the same side or opposite sides along the length direction X of the first housing wall. For Figure 6 illustrating with the shown orientation, the fourth extension portion 64 and the second extension portion 62 extend towards the same side along the length direction X of the first housing wall. The fourth extension portion 64 and the second extension portion 62 can extend towards one side ( Figure 6 the left side of the second main body portion 52 in the figure) along the length direction X of the first housing wall relative to the second main body portion 52. The fourth extension portion 64 and the second extension portion 62 can extend towards the other side ( Figure 6 the right side of the second main body portion 52 in the figure) along the length direction X of the first housing wall relative to the second main body portion 52. The fourth extension portion 64 and the second extension portion 62 can also extend towards opposite sides along the length direction X of the first housing wall, that is, one of the fourth extension portion 64 and the second extension portion 62 extends towards one side ( Figure 6 the left side of the second main body portion 52 in the figure) along the length direction X of the first housing wall relative to the second main body portion 52, and the other extends towards the other side ( Figure 6 the right side of the second main body portion 52 in the figure) along the length direction X of the first housing wall relative to the second main body portion 52. In a specific embodiment, the fourth extension portion 64 and the second extension portion 62 extend towards the same side along the length direction X of the first housing wall.

[0212] Of course, a terminal board 4 can also have three, four, five or more extension portions 6, and the extension directions of the extension portions 6 can be the same or different.

[0213] When a terminal board 4 is provided with at least two extension portions 6, the extension directions of the extension portions 6 can be the same or opposite, improving the flexibility of the arrangement of the extension portions 6.

[0214] In some embodiments, along the width direction Y of the first housing wall, the ratio of the length of the extension portion 6 to the length of the main body portion 5 is in the range of 0.4 to 0.8.

[0215] As Figures 5 to 7 shown, along the width direction Y of the first housing wall, the ratio of the length of the extension portion 6 to the length of the main body portion 5 where it is located is in the range of 0.4 to 0.8, that is, 0.4 ≤ Y1 / Y2 ≤ 0.8, where Y1 is the length of the extension portion 6 along the width direction Y of the first housing wall, and Y2 is the length of the main body portion 5 along the width direction Y of the first housing wall.

[0216] Optionally, Y1 / Y2 = 0.4, Y1 / Y2 = 0.45, Y1 / Y2 = 0.5, Y1 / Y2 = 0.6, Y1 / Y2 = 0.65, Y1 / Y2 = 0.7, Y1 / Y2 = 0.8, or other ratios within the above range. The smaller the value, the more extension parts 6 can be provided on the main body part 5, which helps to improve the heat dissipation capacity of the electrode terminal 3 while reducing the weight of the battery cell 10. Of course, it can also be other ranges within the above range. For example, Y1 / Y2 can also take 0.3. Among the multiple extension parts, the values of Y1 / Y2 of each extension part can be the same or different.

[0217] Thus, a main body part 5 can be provided with multiple extension parts 6, and the number of extension parts 6 can be increased. Under the same heat dissipation effect, the volume of the extension part 6 can be reduced, the weight of the battery cell 10 can be reduced, and the production cost can be reduced. Along the width direction Y of the first housing wall, by setting the ratio of the length of the extension part to the length of the main body part within the range of 0.4 to 0.8, the number of extension parts and the size of a single extension part can be taken into account simultaneously, thereby improving the heat dissipation performance.

[0218] In some embodiments, the first electrode terminal 31 includes a first terminal plate 41, the second electrode terminal 32 includes a second terminal plate 42, and along the width direction Y of the first housing wall, the ratio of the lengths of the first terminal plate 41 and the second terminal plate 42 to the length of the first housing wall 11 is within the range of 0.6 to 0.9. When the outer contours of the first terminal plate and the second terminal plate have different lengths along the length direction of the first housing wall, the maximum length is taken as the length of the first terminal plate and the length of the second terminal plate.

[0219] As Figure 5 shown, along the width direction Y of the first housing wall, the ratio of the length of the first terminal plate 41 to the length of the first housing wall 11 is within the range of 0.6 to 0.9, that is, 0.6 ≤ B11 / W ≤ 0.9, where B11 is the length of the first terminal plate 41 along the width direction Y of the first housing wall, and W is the length of the first housing wall 11 along the width direction Y of the first housing wall. Sometimes the width direction Y of the first housing wall is also referred to as the thickness direction of the battery cell 10.

[0220] Optionally, 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, etc., or other ratios within the above range. The larger the value, the better, so that the size of the first terminal plate 41 along the width direction Y of the first housing wall can be increased, and thus more extension parts 6 extending along the length direction X of the first housing wall can be provided, thereby improving the heat dissipation capacity of the electrode terminal 3. Of course, it can also be other ranges within the above range. For example, B11 / W can also take 0.5.

[0221] As shown Figure 5 in the figure, along the width direction Y of the first housing wall, the ratio of the length of the second terminal plate 42 to the length of the first housing wall 11 ranges from 0.6 to 0.9. That is, 0.6 ≤ B12 / W ≤ 0.9, where B12 is the length of the second terminal plate 42 along the width direction Y of the first housing wall, and W is the length of the first housing wall 11 along the width direction Y of the first housing wall. The width direction Y of the first housing wall is the width direction of the first housing wall 11. Sometimes the width direction Y of the first housing wall is also referred to as the thickness direction of the battery cell 10.

[0222] Optionally, 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, etc., and it can also be other ratios within the above range. The larger the value, the better, so that the size of the second terminal plate 42 along the width direction Y of the first housing wall can be increased, so that more extension parts 6 extending along the length direction X of the first housing wall can be provided, thereby improving the heat dissipation capacity of the electrode terminal 3. Of course, it can also be other ranges within the above range. For example, B12 / W can also take 0.5. Among them, the values of B11 / W and B12 / W can be the same or different.

[0223] It is possible to increase the size of the terminal plate 4 along the width direction Y of the first housing wall, so that the terminal plate 4 is provided with a plurality of extension parts 6, thereby improving the heat dissipation capacity of the electrode terminal 3.

[0224] 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, and the second terminal plate includes a second extension part. Along the length direction X of the first housing 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 housing 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. When the outer contours of the first terminal plate and the second terminal plate along the length direction of the first housing wall have different lengths, the maximum length is used as the length of the first terminal plate and the length of the second terminal plate.

[0225] As shown Figure 5As shown, along the length direction X of the first housing wall, the value range of the ratio of the length X1 of the first extension 61 to the length X3 of the first terminal plate 41 is from 0.5 to 1, that is, 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 it can also be other ratios within the above range. Of course, it can also be other ranges within the above range. For example, X1 / X3 can also take 0.4.

[0226] As Figures 5 to 7 shown, along the length direction X of the first housing wall, the value range of the ratio of the length X2 of the second extension 62 to the length X4 of the second terminal plate 42 is, that is, 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 it can also be other ratios within the above range. Of course, it can also be other ranges within the above range. For example, X2 / X4 can also take 0.4. The values of X1 / X3 and X2 / X4 can be the same or different.

[0227] Along the length direction X of the first housing wall, increase the size of the first extension 61 occupying the first terminal plate 41, and / or the size of the second extension 62 occupying the second terminal plate 42. Thus, the size of the extension 6 is increased, and the heat dissipation area of the extension 6 is increased, which can effectively improve the heat dissipation performance of the electrode terminal 3.

[0228] 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 L of the first housing wall 11 along the length direction X of the first housing wall is in the range of 0.2 to 0.7; and / or, the ratio of the length X4 of the second terminal plate 42 along the length direction X of the first housing wall to the length L of the first housing wall 11 along the length direction X of the first housing wall is in the range of 0.2 to 0.7.

[0229] As Figure 5 shown, along the length direction X of the first housing wall, the ratio of the length X3 of the first terminal plate 41 to the length L of the first housing wall 11 is in the range of 0.2 to 0.7, that is, 0.2 ≤ X3 / L ≤ 0.7. Optionally, X3 / L = 0.2, X3 / L = 0.3, X3 / L = 0.4, X3 / L = 0.5, X3 / L = 0.6 or X3 / L = 0.7, or it can also be other ratios within the above range. Of course, it can also be other ranges within the above range. For example, X3 / L can also take 0.8.

[0230] As Figures 5 to 7As shown, along the length direction X of the first housing wall, the ratio of the length X4 of the second terminal plate 42 to the length L of the first housing wall 11 is in the range of 0.2 to 0.7, that is, 0.2 ≤ X4 / L ≤ 0.7. Optionally, X4 / L = 0.2, X4 / L = 0.3, X4 / L = 0.4, X4 / L = 0.5, X4 / L = 0.6 or X4 / L = 0.7, and it can also be other ratios within the above range. Of course, it can also be other ranges within the above range. For example, X4 / L can also take 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.

[0231] Along the length direction X of the first housing wall, the size of the terminal plate 4 is increased, thereby increasing the heat dissipation area of the terminal plate 4 and effectively improving the heat dissipation performance of the electrode terminal 3.

[0232] 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.

[0233] As Figures 5 to 7 shown, in the first terminal plate 41, the ratio of the length X3 along the length direction X of the first housing wall to the length B11 along the width direction Y of the first housing wall is in the range of 3.5 to 10, that is, 3.5 ≤ X3 / B11 ≤ 10.

[0234] 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, and it can also be other ratios within the above range. Of course, it can also be other ranges within the above range. For example, X3 / B11 = 3.

[0235] As Figures 5 to 7 shown, in the second terminal plate 42, the ratio of the length X4 along the length direction X of the first housing wall to the length B12 along the width direction Y of the first housing wall is in the range of 3.5 to 10, that is, 3.5 ≤ X4 / B12 ≤ 10.

[0236] 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. Among them, the ratios of X3 / B11 and X4 / B12 can be the same or different.

[0237] The terminal board 4 is configured to be elongated, which is beneficial to increasing the heat dissipation area of ​​the terminal board 4 and further improving the heat dissipation performance of the electrode terminal 3 .

[0238] In some embodiments, Figure 8 As shown, the first electrode terminal 31 includes a first terminal plate 41, at least a portion of which is disposed on a side of the first shell wall 11 away from the accommodating space 12, and the second electrode terminal 32 includes a second terminal plate 42, which is disposed on a side of the first shell wall 11 away from the accommodating space.

[0239] The first terminal plate 41 and the second terminal plate 42 are located outside the housing 1 of the battery cell and can be used to connect with a busbar or the like. The terminal plates can be made of metal, such as copper, aluminum, or the like.

[0240] Optionally, the first terminal plate 41 and the second terminal plate 42 are each substantially in the shape of a flat plate. The shape of the flat plate can be designed according to the situation, for example, it can be rectangular, circular, etc.

[0241] Optionally, the first terminal plate 41 and the second terminal plate 42 may be fixed to the first housing wall 11 by means of connecting columns or the like.

[0242] This enables connection with a busbar or the like, and electrical connection with an external structure.

[0243] In some embodiments, the first electrode terminal 31 includes a first terminal disc 311, which is at least partially disposed on the side of the first shell wall 11 facing the accommodating space 12, and the second electrode terminal 32 includes a second terminal disc 321, which is at least partially disposed on the side of the first shell wall 11 facing the accommodating space, and along the wall thickness direction of the first shell wall, the first terminal disc is at least partially disposed between the second terminal disc and the first shell wall; or, along the wall thickness direction of the first shell wall, the second terminal disc is at least partially disposed between the first terminal disc and the first shell wall.

[0244] The first terminal plate 311 and the second terminal plate 321 are located inside the housing 1 of the battery cell and can be used to electrically connect to the tabs. The terminal plates can be made of metal, such as copper, aluminum, etc.

[0245] Optionally, the first terminal plate 311 and the second terminal plate 321 are each configured to be generally flat. The shape of the flat plate can be designed according to circumstances. For example, it can be rectangular, circular, Figure 8 the L-shaped shown, etc.

[0246] Optionally, the first terminal plate 311 and the second terminal plate 321 can be fixed to the first housing wall 11 through connecting columns or the like.

[0247] Since the electrode terminal 3 includes a terminal plate located outside the housing 1 of the battery cell 10 and a terminal plate located inside the housing, the electrode terminal 3 can be easily connected to the tab of the electrode assembly 7 through the terminal plate. Moreover, by designing the terminal plate to be larger, the heat dissipation performance can be improved, the supporting effect on the first housing wall 11 can be enhanced, and the connection strength with the bus bar 2 can be increased. The shape design freedom of the terminal plate and the terminal plate is relatively high. Moreover, the terminal plate and the terminal plate sandwich the first housing wall 11 from the inside and outside of the housing 1 respectively, which can improve the bending strength of the first housing wall 11.

[0248] In some embodiments, the first electrode terminal further includes a first terminal plate. At least a part of the first terminal plate is disposed on the side of the first housing wall facing the accommodation space. The second electrode terminal further includes a second terminal plate. At least a part of the second terminal plate is disposed on the side of the first housing wall facing the accommodation space. The first main body portion 51 and the first terminal plate 311 are directly connected through a first connecting column 312; the second main body portion 52 and the second terminal plate 321 are directly connected through a second connecting column 322.

[0249] As Figure 8 shown, the first terminal plate 41 and the first terminal plate 311 are connected through a first connecting column 312. The first connecting column 312 is used to connect the first main body portion 51 of the first terminal plate 41. There are no restrictions on the shape, size or quantity of the first connecting column 312, as long as the connection between the first terminal plate 41 and the first terminal plate 311 can be achieved. In a specific embodiment, the first connecting column 312 is elliptical.

[0250] The first connecting column 312 can be connected to the first main body portion 51 or the first terminal plate 311 in the first terminal plate 41 by means of threaded connection, welding, riveting, etc., or can be formed integrally with the first main body portion 51 or the first terminal plate 311 in the first terminal plate 41. The second connecting column 322 can be connected in a similar manner to the first connecting column 312. Therefore, the first connecting column 312 is described in detail here, and the detailed description of the second connecting column 322 is omitted.

[0251] In some embodiments, as Figure 8As shown, the first connecting column 312 is formed as a whole with the first terminal plate 311 and extends perpendicularly to the plate surface of the first terminal plate 311. A through hole is formed in the first main body 51 in the first terminal plate 41, and the first connecting column 312 is inserted into the through hole and fixedly connected to the first main body 51. Thus, the first electrode terminal 31 can be assembled to the first housing wall 11. In addition, a terminal seal can be further assembled between the first connecting column 312 and the first main body 51.

[0252] Since the terminal plate 4 and the terminal plate can be connected together through the connecting post, they can function as electrode terminals 3 to draw current from the electrode assembly 7. Moreover, the connecting post is provided in the main body 5, so that the electrode terminal 3 can be reliably fixed to the first housing wall 11 in the main body 5.

[0253] In some embodiments, Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the electrode assembly includes a first electrode piece and a second electrode piece with opposite polarities, the first electrode terminal 31 is electrically connected to the first electrode piece of the electrode assembly, and the second electrode terminal 32 is electrically connected to the second electrode piece of the electrode assembly.

[0254] The first pole piece and the second pole piece are led out through the pole lugs and are directly or indirectly connected to the electrode terminals. Figure 3 As shown, the electrode tabs include a first electrode tab 71 and a second electrode tab 72 .

[0255] One of the first pole tab 71 and the second pole tab 72 may be a positive pole tab, and the other may be a negative pole tab. One of the first electrode terminal 31 and the second electrode terminal 32 may be connected to the positive pole tab, and the other may be connected to the negative pole tab; the first electrode terminal 31 and the second electrode terminal 32 may both be connected to the first pole tab 71, so as to have the same polarity as the first pole tab 71; the first electrode terminal 31 and the second electrode terminal 32 may also both be connected to the second pole tab 72, so as to have the same polarity as the second pole tab 72.

[0256] Optionally, the first electrode terminal 31 and the second electrode terminal 32 may be directly connected to the first electrode tab 71, or may be connected to the first electrode tab 71 through a transition component. Optionally, the first electrode terminal 31 and the second electrode terminal 32 may be directly connected to the second electrode tab 72, or may be connected to the second electrode tab 72 through a transition component.

[0257] Thus, the polarities of the first electrode terminal 31 and the second electrode terminal 32 can be made the same or different according to circumstances, so that the electrode terminals 3 can be flexibly arranged on the outer shell of the battery cell 10 according to needs.

[0258] In some embodiments, Figures 12 to 14As shown, along the wall thickness direction of the first housing wall 11, the second terminal plate 42 is at least partially disposed between the first terminal plate 41 and the first housing wall 11, and the first terminal plate 41 abuts against the second terminal plate 42.

[0259] Thus, the bending strength of the electrode terminal 3 and the first housing wall 11 can be further improved by setting the first terminal plate 311 and the second terminal plate 321 to be engaged with each other; moreover, the first terminal plate 311 and the second terminal plate 321 can be electrically connected to each other, which is convenient for simplifying the connection structure when the two electrode terminals 3 have the same polarity.

[0260] In some embodiments, as Figure 14 and Figure 18 shown, the first terminal plate 41 has a first protrusion 314, the second terminal plate 42 has a first recess 315, the first protrusion 314 and the first recess 315 at least partially overlap along the wall thickness direction Z of the first housing wall, and the first protrusion 314 and the first recess 315 cooperate with each other.

[0261] The first protrusion 314 refers to a part of the structure that protrudes from the first terminal plate 41 and enters the outer contour of the second terminal plate 42. The first recess 315 refers to a recess formed relative to the surface of the second terminal plate 42 that can accommodate the first protrusion 314. The recess can be formed by a groove or by a step. In the case where the recess is formed by a step, it can include a first-level step, or can include a second-level step or more levels of steps.

[0262] Here, the first protrusion 314 and the first recess 315 in the state of mutual cooperation can at least limit the displacement along the wall thickness direction Z of the first housing wall. Optionally, the first protrusion 314 and the first recess 315 in the state of mutual cooperation can also limit the displacement along the length direction X and / or the width direction Y of the first housing wall.

[0263] In some embodiments, the battery cell 10 includes a first insulating member 81. The first insulating member 81 is fixed to the first electrode terminal 31, the second electrode terminal 32 is at least partially disposed between the first insulating member 81 and the first housing wall 11, and the first insulating member 81 abuts against the second electrode terminal 32.

[0264] The first electrode terminal 31 and the first insulating member 81 are fixed to each other. The fixing method can be integral injection molding, bonding, fastening the two together through a connecting column, etc.

[0265] In Figure 8 , Figure 14 and Figure 18In the specific embodiment shown, the surface of the second electrode terminal 32 located between the first insulating member 81 and the first shell wall 11 along the wall thickness direction Z of the first shell wall that is away from the first shell wall 11 abuts against the surface of the first insulating member 81 along the wall thickness direction Z of the first shell wall that is close to the first shell wall 11.

[0266] exist Figure 18 In the specific embodiment shown, the first insulating member 81 is not between the first electrode terminal 31 and the second electrode terminal 32, that is, the first electrode terminal 31 is not pressed on the side of the first insulating member 81 away from the first housing wall 11. The side of the first insulating member 81 facing the first housing wall 11 abuts against the side of the second electrode terminal 32 away from the first housing wall 11, that is, the bending deformation of the second electrode terminal 32 is limited by a part of the first insulating member 81. Here, the first insulating member 81 has a suitable bending strength.

[0267] The first insulating member 81 is used at least to insulate the second electrode terminal 32 from the first electrode terminal 31 , and may also be used to insulate the first electrode terminal 31 from the first housing wall 11 .

[0268] In some specific embodiments, the first electrode terminal 31 and the second electrode terminal 32 are made of conductive metal materials, such as copper and aluminum; and the first insulating member 81 is made of plastic material, for example.

[0269] Thus, the first electrode terminal and the second electrode terminal can be insulated from each other, so 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, if the first insulating member has a suitable strength, the bending deformation of the second electrode terminal can be limited by the first insulating member.

[0270] In some embodiments, Figure 13 , Figure 14 and Figure 18 As shown, the first insulating member 81 is partially disposed between the first electrode terminal 31 and the first housing wall 11 .

[0271] The first protrusion 314 includes a structure protruding from a part of the first terminal plate 41, and also includes a structure protruding from a part of the first insulating member 81. Figure 13 As shown, when a portion of the first insulating member 81 (e.g., the first covering portion 811) abuts against the second electrode terminal 32 to limit bending deformation, the portion of the first insulating member 81 (e.g., the first covering portion 811) corresponds to the first protruding portion 314. When the first electrode terminal 31 and the first insulating member 81 abut against the second electrode terminal 32 to limit bending deformation, the first protruding portion 314 includes a portion protruding from the second electrode terminal 32 and a portion protruding from the first insulating member 81.

[0272] Optionally, the first electrode terminal 31 and the second electrode terminal 32 are respectively connected to the positive electrode tab and the negative electrode tab with opposite polarities, and at least a part of the second electrode terminal 32 is disposed between the first insulating member 81 and the first housing wall 11. Further optionally, a first insulating member 81 is provided between the entire first electrode terminal 31 and the first housing wall 11, and a part of the first insulating member 81 is disposed between the first electrode terminal 31 and the first housing wall 11.

[0273] Optionally, the first electrode terminal 31 and the second electrode terminal 32 are connected to the same electrode tab among the positive electrode tab and the negative electrode tab with the same polarity, and an insulating member may not be provided between the first electrode terminal 31 and the second electrode terminal 32. Optionally, at least a part of the second electrode terminal 32 is disposed between the first electrode terminal 31 and the first housing wall 11. Further optionally, a first insulating member 81 is provided between the entire first electrode terminal 31 and the first housing wall 11, between the first electrode terminal 31 and the first housing wall 11.

[0274] Thereby, the first electrode terminal 31 can be insulated from the outer shell 1 of the battery cell, and the first electrode terminal 31 and the second electrode terminal 32 can be insulated from each other. Therefore, even if the first electrode terminal 31 and the second electrode terminal 32 have opposite polarities, they can cooperate with each other to improve the bending resistance of each electrode terminal, and the design freedom of the electrode terminal on the outer shell of the battery cell is improved. Moreover, when the first insulating member 81 has an appropriate strength, the bending deformation of the second electrode terminal 32 can be restricted by the first insulating member 81.

[0275] In some embodiments, as Figure 8 、 Figure 14 and Figure 18 shown, along the wall thickness direction of the first housing wall 11, the first electrode terminal 31, the first insulating member 81 and the second electrode terminal 32 partially overlap, and the part of the first electrode terminal 31 that overlaps with the first insulating member 81 and the second electrode terminal 32 abuts against the first insulating member 81.

[0276] 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.

[0277] Thereby, the bending deformation of the second electrode terminal 32 can be restricted jointly 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 that the supporting and fixing ability of the first electrode terminal 31 to the second electrode terminal 32 can be further increased, and the bending deformation resistance ability of each electrode terminal can be improved; moreover, the strength of the area where the electrode terminal is disposed in the first housing wall 11 can be enhanced; in addition, the freedom of setting the polarity of the electrode terminal is high.

[0278] In some embodiments, the first extension portion 61 is connected to the first terminal plate 311. The first recessed portion is disposed on a side of the second extension portion 62 facing the first electrode terminal 31, and the first protruding portion is disposed on a side of the first extension portion 61 facing the second electrode terminal 32.

[0279] Wherein, the arrangement of the first recessed portion and the first protruding portion can be as Figure 18 shown, which will not be elaborated here.

[0280] Thus, a structure in which the protruding portion and the recessed portion cooperate with each other can also be formed between the two extension portions. The recessed portion of the second extension portion 62 is pressed against the first housing wall 11 by the protruding portion of the first extension portion 61 fixed to the first housing wall 11, realizing mutual support of the two electrode terminals, which is beneficial to improving the bending strength of the electrode terminals.

[0281] In some embodiments, as Figure 14 and Figure 18 shown, the first recessed portion 315 includes a first step portion 3151 and a second step portion 3152. The second step portion 3152 is disposed on a side of the first step portion 3151 away from the first terminal plate 41. The first protruding portion 314 includes a protruding portion provided on the first terminal plate 41. Along the wall thickness direction Z of the first housing wall, a part of the second terminal plate 42 is located between the protruding portion and the first housing wall 11, and the protruding portion is at least partially received in the step space formed by the first step portion 3151. The first protruding portion 314 further includes a first covering portion 811 provided on the first insulating member 81. Along the wall thickness direction of the first housing wall 11, a part of the second terminal plate 42 is located between the first covering portion 811 and the first housing wall 11, and the first covering portion 811 is at least partially received in the step space of the second step portion 3152.

[0282] Here, the first step portion 3151 is formed by a portion of the second terminal plate 42 that becomes lower along the wall thickness direction of the first housing wall 11 away from the first housing wall 11. As the part of the second terminal plate in the second dashed box ( Figure 18 the right dashed box in Figure 18 ), a second step portion 3152 is further formed at a position farther from the protruding portion than the first step portion 3151. As the part of the second terminal plate in the second dashed box ( Figure 18 the right dashed box in Figure 18 ). The first insulating member 81 has a first covering portion 811. The first covering portion 811 covers the second step portion 3152 along the wall thickness direction of the first housing wall 11 from a side away from the first housing wall 11. The first protruding portion 314 includes a protruding portion and a first covering portion 811. Among them, the first dashed box ( Figure 18 the left dashed box in

[0283] The first stepped portion 3151 is formed on the surface of the second terminal plate 42 on the side facing away from the first housing wall 11 in the wall thickness direction of the first housing wall 11. The protruding portion is received in the first stepped portion 3151, and the first insulating member 81 is interposed between the protruding portion and the first stepped portion 3151.

[0284] The first insulating member 81 also has a portion covering the surface of the protruding portion in contact with the recessed portion. Thus, in a state where the protruding portion is inserted into the first stepped portion 3151, the first insulating member 81 is clamped between the protruding portion and the first stepped portion 3151, so that an insulating state can be maintained.

[0285] The second stepped portion 3152 may be a portion that becomes lower 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 from the first housing wall 11; the first covering portion 811 may be a part of the first insulating member 81. Along the wall thickness direction Z of the first housing wall, the first covering portion 811 may be partially or entirely recessed into the second stepped portion 3152.

[0286] The lengths of the second stepped 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 lengths of the second stepped 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 insulation reliability.

[0287] Thus, through the cooperation of the protruding portion and the first stepped portion 3151, the bending deformation of the second terminal plate 42 can be restricted, and further, at least a part of the protruding portion is received in the first stepped portion 3151 to reduce the space occupied by the protruding portion and improve the space utilization rate. By providing the first covering portion 811, the creepage distance on the surfaces of the first electrode terminal 31 and the second electrode terminal 32 can be increased, and the insulation reliability can be improved. Moreover, by receiving the first covering portion 811 in the second stepped portion 3152, the covering portion does not occupy extra space, thereby improving the space utilization rate.

[0288] In some embodiments, as Figure 18 shown, along the wall thickness direction of the first housing wall 11, the surface of the first covering portion 811 on the side facing away from the first housing wall 11 does not extend beyond the surface of the first terminal plate 41 on the side facing away from the first housing wall; and / or, along the wall thickness direction of the first housing wall 11, the surface of the first covering portion on the side facing away from the first housing wall does not extend beyond the surface of the second terminal plate 42 on the side facing away from the first housing wall 11.

[0289] The surface of the first covering portion 811 on the side facing away from the first housing wall 11 may be substantially flush with or slightly lower than the surface of the first terminal plate 41 on the side facing away from the first housing wall. Additionally, the surface of the first covering portion 811 on the side facing away from the first housing wall 11 may be substantially flush with or slightly lower than the surface of the second terminal plate 42 on the side facing away from the first housing wall 11. In a specific embodiment, the surface of the first covering portion 811 on the side facing away from the first housing wall 11 is substantially flush with the surfaces of the first terminal plate 41 on the side facing away from the first housing wall and the second terminal plate 42 on the side facing away from the first housing wall. Here, being substantially flush means there is no obvious step difference.

[0290] Since the surface of the first covering portion 811 on the side facing away from the first housing wall 11 does not extend beyond the surfaces of the first terminal plate 41 and / or the second terminal plate 42 on the side facing away from the first housing wall, the first covering portion 811 does not additionally occupy the space in the thickness direction of the battery cell or even the battery pack along the first housing wall. Moreover, to a certain extent, it avoids interference between the first covering portion 811 and the bus bar, facilitating reliable connection between the bus bar and the like and the first terminal plate 41 and the second terminal plate 42.

[0291] In some embodiments, along the thickness direction Z of the first housing wall, the height between the surface of the first terminal plate 41 on the side facing away from the housing wall and the surface of the second terminal plate 42 on the side facing away from the first housing wall is greater than or equal to 0 and does not exceed 0.5 mm. For example, it can be 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. Of course, other values within the above range can also be taken.

[0292] Thus, the first terminal plate 41 and the second terminal plate 42 are nearly flush, which helps to jointly bear the external pressure and improve the anti-deformation ability.

[0293] In some embodiments, as Figure 14 shown, as Figure 8 , Figure 13 and Figure 14 shown, the battery cell 10 further includes a second insulating member 82, and the second insulating member 82 is at least partially located between the second electrode terminal 32 and the first housing wall 11.

[0294] There may be an insulating member between the second electrode terminal 32 and the first housing wall 11, or an insulating member may not be provided.

[0295] Optionally, the second electrode terminal 32 is connected to the negative electrode tab, no insulating member is provided between the second electrode terminal 32 and the first housing wall 11, and the first housing wall 11 and even the entire outer shell 1 are negatively charged.

[0296] Optionally, the second electrode terminal 32 is connected to the positive electrode tab or the negative electrode tab. There is a second insulating member 82 between the second electrode terminal 32 and the first housing wall 11, so that the first housing wall 11 and even the entire housing 1 are insulated from the second electrode terminal 32 and are not charged.

[0297] This can also insulate the second electrode terminal 32 from the housing 1 of the battery cell. Therefore, it can be applied not only to the design where the housing is charged, but also to the design where the housing is not charged.

[0298] In some embodiments, the first insulating member 81 and the second insulating member 82 are integrally formed parts.

[0299] Alternatively, the first insulating member 81 and the second insulating member 82 can be separately formed parts that are formed individually, or they can be integrally formed as one formed part. As the forming method, common forming means such as die forming can be used.

[0300] The first insulating member 81 and the second insulating member 82 can be formed into a shallow tray shape that generally matches the shape of the first electrode terminal 31 and the second electrode terminal 32, so as to be able to accommodate the first electrode terminal 31 and the second electrode terminal 32, so that insulation can be provided from the bottom surface and the circumferential surface of the first electrode terminal 31 and the second electrode terminal 32 along the wall thickness direction Z of the first housing wall.

[0301] This can reduce the number of components and simplify the assembly steps.

[0302] In some embodiments, as Figure 8 shown, a first recess 131 and a second recess 132 are formed in the first housing wall 11. At least a part of the first insulating member 81 and at least a part of the second insulating member 82 are respectively located in the first recess 131 and the second recess 132.

[0303] The first recess 131 or the second recess 132 is a recessed area formed by thinning the thickness of the first housing wall 11 along the wall thickness direction Z of the first housing wall. The top view shape (the shape observed along the wall thickness direction Z of the first housing wall) of this recessed area can be configured to be able to accommodate at least a part of the first insulating member 81 and at least a part of the second insulating member 82. The depth of the recessed area can be substantially the same as or slightly lower than the height (the dimension along the wall thickness direction Z of the first housing wall) of the first insulating member 81 or the second insulating member 82. Of course, the heights of the first recess 131 and the second recess 132 can be the same or different.

[0304] One or two or more recesses can be formed on the first housing wall 11.

[0305] Corresponding to the recessed area, the portions of the first insulating member 81 and the second insulating member 82 located in the recess are formed with convex portions that can be engaged with the recess, so as to be 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 (the direction perpendicular to the wall thickness direction Z of the first housing wall).

[0306] By causing at least a part of the first insulating member 81 and at least a part of the second insulating member 82 to sink into the recess on the first housing wall, it is beneficial to improve the mounting strength of the insulating member relative to the first housing wall 11, reduce the possibility of the insulating member shifting along the surface of the first housing wall 11, and also facilitate the positioning of the insulating member and the first housing wall 11 with respect to each other during assembly.

[0307] In some embodiments, as Figure 8 shown, the first recess 131 and the second recess 132 form the same recess.

[0308] Thereby, the number of components can be reduced and the assembly steps can be simplified.

[0309] In some embodiments, as Figure 13 and Figure 14 shown, the first recessed portion 315 is provided on the side of the second extension portion 62 facing the first electrode terminal 31, and the first protruding portion 314 is provided on the side of the first main body portion 51 facing the second electrode terminal 32.

[0310] The first main body portion 51 is fixedly connected to the first housing wall 11 through the first connecting column 312, so the connection of the first main body portion 51 to the first housing wall 11 is firm. Moreover, compared with the first extension portion 61, the shape of the first main body portion 51 is not easily bent. Therefore, the first protruding portion 314 mainly playing a role in preventing warping is provided on the first main body portion 51, and the first recessed portion 315 is provided on the second extension portion 62 where warping is likely to occur. The first recessed portion 315 is located between the first protruding portion 314 and the first housing wall 11. Therefore, to a certain extent, the first protruding portion 314 prevents the first recessed portion 315 and the second extension portion 62 from warping away from the first housing wall 11.

[0311] Thus, the first recessed portion 315 provided on the second extension portion 62 can be abutted by the first protruding portion 314 provided on the first main body portion 51 and be fixed between the first protruding portion 314 and the first housing wall 11, thereby preventing the second extension portion 62 from warping away from the first housing wall 11 due to its long extension to a certain extent, and improving the bending strength of the second extension portion 62 and the entire second electrode terminal 32. Even if a pulling force is applied to the electrode terminal by a bus bar or the like, the electrode terminal is not easily bent or broken, and the connection reliability between the bus bar and the electrode terminal is improved.

[0312] For the first extension portion 61, one end that extends away from the first main body portion 51 can be fixed to the first housing wall 11 through the third connecting post 325.

[0313] In Figures 12 to 14 the illustrated embodiment, only one set of cooperating protrusions and recesses is provided, but more protrusions and recesses can also be provided.

[0314] In some embodiments, as Figure 20 illustrated, the first electrode terminal 31 further has a second recess 316, and the second electrode terminal 32 further has a second protrusion 317. The second protrusion 317 and the second recess 316 at least partially overlap along the wall thickness direction Z of the first housing wall. The second protrusion 317 and the second recess 316 cooperate with each other. The second recess 316 is disposed on a side of the first extension portion 61 facing the second electrode terminal 32, and the second protrusion 317 is disposed on a side of the second main body portion 52 facing the first electrode terminal 31.

[0315] The second protrusion 317 refers to a part of the structure that protrudes from the second electrode terminal 32 and enters the outer contour of the first electrode terminal 31. The second recess 316 refers to a recess formed relative to the surface of the first electrode terminal 31 that can accommodate the second protrusion 317. The recess can be formed by a groove or by a step. In the case where the recess is formed by a step, it can include a first-level step, or a second-level step or more levels of steps.

[0316] Thus, through the cooperation of the second protrusion 317 and the second recess 316, it is convenient to realize the support and fixation of the second electrode terminal 32 to the first electrode terminal 31, improve the bending strength of the first electrode terminal 31, and facilitate processing; by disposing the second protrusion 317 in the second recess 316, the space occupied by the second protrusion 317 is reduced, and the space utilization rate is improved.

[0317] In some embodiments, as Figure 20 illustrated, the second recess 316 includes a third step portion 3161 and a fourth step portion 3162. The fourth step portion 3162 is disposed on a side of the third step portion 3161 away from the second electrode terminal 32. The third step portion 3161 is a part of the structure in the first dashed box ( Figure 20 the left dashed box in), where the first dashed box further includes a partial protruding portion. The fourth step portion 3162 is the second dashed box ( Figure 20The partial structure within the right dashed-line frame); the second protruding portion 317 includes the protruding portion provided on the second electrode terminal 32. Along the wall thickness direction Z of the first housing wall, a part of the first electrode terminal 31 is located between the protruding portion and the first housing wall 11, and the protruding portion is at least partially received in the stepped space formed by the third stepped portion 3161; the second protruding portion 317 further includes the second covering portion 812 provided on the second insulating member 82. Along the wall thickness direction Z of the first housing wall, a part of the first electrode terminal 31 is located between the second covering portion 812 and the first housing wall 11, and the second covering portion 812 is at least partially received in the stepped space formed by the fourth stepped portion 3162.

[0318] Here, the third stepped portion 3161 is formed by the portion of the first electrode terminal 31 that becomes lower along the wall thickness direction of the first housing wall 11 toward the side away from the first housing wall 11, as Figure 20 The first electrode terminal in Figure 20 The part within the right dashed-line frame) further forms a fourth stepped portion 3162 at a position farther from the protruding portion than the third stepped portion 3161, as Figure 20 The first electrode terminal in Figure 20 The right dashed-line frame). The second insulating member 82 has a second covering portion 812. The second covering portion 812 covers the fourth stepped portion 3162 along the wall thickness direction of the first housing wall 11 from the side away from the first housing wall 11. The second protruding portion 317 includes the protruding portion and the second covering portion 812, wherein Figure 20 The left dashed-line frame) in also includes a part of the protruding portion.

[0319] 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.

[0320] The third stepped portion 3161 is formed on the surface of the first electrode terminal 31 on the side away from the first housing wall 11 along the wall thickness direction of the first housing wall 11. The protruding portion is received in the third stepped portion 3161, and the second insulating member 82 is interposed between the protruding portion and the third stepped portion 3161.

[0321] The second insulating member 82 also has a part that covers the surface of the protruding portion in contact with the recessed portion, so that in the state where the protruding portion is inserted into the third stepped portion 3161, the second insulating member 82 is clamped between the protruding portion and the third stepped portion 3161, thereby being able to maintain an insulating state.

[0322] As Figure 20As shown, at the first electrode terminal 31, a fourth step portion 3162 is further formed at a position farther from the protruding portion than the third step portion 3161. The second insulating member 82 has a second covering portion 812. The second covering portion 812 covers the fourth step portion 3162 from the side facing away from the first housing wall 11 along the wall thickness direction of the first housing wall 11.

[0323] The fourth step portion 3162 may be a portion that is lower along the wall thickness direction Z of the first housing wall with respect to the surface of the first electrode terminal 31 that is farthest from the first housing wall 11; the second covering portion 812 may be a part of the second insulating member 82. Along the wall thickness direction Z of the first housing wall, the second covering portion 812 may partially or entirely sink into the fourth step portion 3162.

[0324] The lengths of the fourth step portion 3162 and the second covering portion 812 along the length direction X of the first housing wall may be determined according to the creepage distance to be provided. Generally, the longer the lengths of the fourth step portion 3162 and the second covering portion 812 along the length direction X of the first housing wall, the greater the creepage distance and the higher the insulation reliability.

[0325] Thus, through the cooperation of the protruding portion and the third step portion, the bending deformation of the first electrode terminal can be restricted, and further, the protruding portion is at least partially received in the third step portion, so as to reduce the space occupied by the protruding portion and improve the space utilization rate. By providing the second covering portion, the creepage distance on the surfaces of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, by receiving the second covering portion in the step portion, the second covering portion does not occupy extra space, thereby improving the space utilization rate.

[0326] In some embodiments, the minimum cross-sectional area for current to pass through in the extension portion 6 is S1, and the capacity of the battery cell 10 is P. Then, the ratio of S1 to P is in the range of 0.2 to 0.3, where the unit of the capacity is Ah.

[0327] Taking the minimum cross-sectional area for current to pass through in the second extension portion 62 as S1 as an example, where 0.2 ≤ S1 / P ≤ 0.3. Optionally, S1 / P = 0.2, S1 / P = 0.21, S1 / P = 0.22, S1 / P = 0.23, S1 / P = 0.24, S1 / P = 0.25, S1 / P = 0.26, S1 / P = 0.27, S1 / P = 0.28, S1 / P = 0.29, or S1 / P = 0.3, etc. The ratio of S1 / P can also be other ratios within the above range. Of course, the ratio of S1 / P can also be in other ranges. For example, S1 / P = 0.19. Among them, the ratio of the minimum cross-sectional area for current to pass through in the first extension portion 61 or the second extension portion 62 to the capacity of the battery cell 10 can be the same or different.

[0328] Of course, the minimum cross-sectional area through which current flows in the first extension portion 61 and the minimum cross-sectional area through which current flows in the second extension portion 62 may be the same or different.

[0329] Set the ratio of S1 to P within a suitable range so that the extension portion has a suitable overcurrent capacity.

[0330] In some embodiments, such as Figure 7 As shown, along the length direction X of the first housing wall, the first extension portion 61 and the second extension portion 62 are located between the first main body portion 51 and the second main body portion 52; along the width direction Y of the first housing wall, the first extension portion 61 and the second extension portion 62 have a first overlapping portion 91, and the width direction Y of the first housing wall is the width direction of the first housing wall 11.

[0331] Such as Figure 7 As shown, along the width direction Y of the first housing wall, the first extension portion 61 and the second extension portion 62 have overlapping portions with each other, that is, the portions of the first extension portion 61 and the second extension portion 62 located within the dotted boxes in the figure. This portion is referred to as the first overlapping portion 91. Here, the first overlapping portion 91 is not necessarily the overlapping and contacting portion of the first extension portion 61 and the second extension portion 62, and includes the cases where the projection portions or all of the projections of the first extension portion 61 and the second extension portion 62 coincide with each other when projected onto the same projection plane along the width direction Y of the first housing wall.

[0332] Thus, by arranging the first extension portion 61 and the second extension portion 62 to overlap in the width direction Y of the first housing wall, the bending strength of the region where the electrode terminals are arranged in the first housing wall 11 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 beneficial to the utilization of the non-electrode terminal arrangement region of the first housing wall 11, and further beneficial to improving the volume utilization rate of the battery pack.

[0333] In some embodiments, such as Figure 7 As shown, the material of the first main body portion 51 and / or the second main body portion 52 is different from the material of the first overlapping portion.

[0334] 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 main body portion 51 on the positive electrode side can be set to a metal material with better thermal conductivity.

[0335] Thus, the materials of the first main body portion 51 and the second main body portion 52 can be set according to the situation, which helps to reduce current loss and improve heat dissipation capacity, etc.

[0336] In some embodiments, such as Figure 7As shown, 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.

[0337] 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%, 40% of L.

[0338] Thus, setting the first overlapping portion 91 to be relatively long is beneficial to improving the strength of the electrode terminal setting area in the first housing wall 11 and even the entire first housing wall.

[0339] In some embodiments, as Figure 7 shown, the length A of the first overlapping portion 91 along the length direction of the first housing wall is in the range of 3 mm to 50 mm.

[0340] Exemplarily, A can be 3 mm, 5 mm, 8 mm, 10 mm, 15 mm, 20 mm, 30 mm, 40 mm, 50 mm. It can also be other length values within the above range.

[0341] Thus, setting the first overlapping portion 91 to be relatively long is beneficial to improving the strength of the electrode terminal setting area in the first housing wall and even the entire first housing wall.

[0342] In some embodiments, along the length direction X of the first housing wall, the first main body portion 51 and the second main body portion 52 have a second overlapping portion.

[0343] As Figure 7 shown, along the length direction X of the first housing wall, the first main body portion 51 and the second main body portion 52 have an overlapping portion that overlaps with each other, and this portion is called the second overlapping portion. Here, the second overlapping portion is not necessarily the portion where the first main body portion 51 and the second main body portion 52 overlap and contact, including the case where the projection portions or all of the projections of the first main body portion 51 and the second main body portion 52 coincide when projected onto the same projection plane along the length direction X of the first housing wall.

[0344] Thus, since there are overlapping portions both in the length direction X of the first housing wall and in the width direction Y of the first housing wall, therefore, the first electrode terminal 31 and the second electrode terminal 32 can be compactly arranged both in the length direction and the width direction of the first housing wall, and the bending strength of the first housing wall 11 can be further improved.

[0345] In some embodiments, as Figure 7As shown, the length of the first housing wall 11 in the width direction Y of the first housing wall is W, and the length of the second overlapping portion in the width direction Y of the first housing wall is B. Then B is in the range of 20% to 90% of W.

[0346] The length of the first housing wall 11 in the width direction Y of the first housing wall refers to the maximum length of the outer contour of the first housing wall 11 in 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.

[0347] Thus, setting the length dimension of the second overlapping region in the width direction Y of the first housing wall to be relatively long is beneficial to enhancing the strength strengthening effect on the first housing wall 11.

[0348] In some embodiments, as Figure 7 shown, along the length direction X 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.

[0349] Here, the closest distance between the first electrode terminal 31 and the second electrode terminal 32 refers to the distance between the closest parts of the first electrode terminal 31 and the second electrode terminal 32 to each other. This 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. Generally, it is considered that when there is an insulating member spaced between the parts where the first electrode terminal 31 and the second electrode terminal 32 are close to each other, they can be arranged relatively close. For example, the closest distance can be set to 0.3 mm or more. When there is no insulating member spaced between the parts where the first electrode terminal 31 and the second electrode terminal 32 are close to each other, they are considered to be arranged slightly farther apart. For example, the closest distance can be set to 2 mm or more.

[0350] Thus, the possibility of short - circuiting between the first electrode terminal and the second electrode terminal can be reduced.

[0351] In some embodiments, as Figure 7 shown, the first electrode terminal 31 includes a first terminal plate 41, the second electrode terminal 32 includes a second terminal plate 42. Both the first electrode terminal 31 and the second electrode terminal 32 include a connection region 93 for connecting with the bus bar 2. The bus bar 2 is used to electrically connect multiple battery cells 10 to each other, and the connection region 93 is formed at least in the first overlapping portion.

[0352] Here, the connection region 93 (in Figure 7The region shown by diagonal shading (in the figure) is the surface region of the first electrode terminal 31 and the second electrode terminal 32 that is connected to the bus bar 2. The connection here includes welding, which can be ultrasonic welding, laser welding or other suitable welding methods.

[0353] In Figure 15 In the specific embodiment shown, the bus bar 2 is configured as a rectangular thin plate, but it is not limited to a rectangle and can also be other suitable shapes. In addition, it is not limited to a plate shape and can also adopt other suitable three-dimensional shapes.

[0354] Thus, the bus bar 2 is connected to the part where the first overlapping portion is formed between the first electrode terminal 31 and the second electrode terminal 32. Since this part has strong bending strength, 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 it is even less likely to break due to bending deformation.

[0355] In some embodiments, as Figure 7 shown, the connection region is also formed in at least one of the first main body portion 51 and the second main body portion 52.

[0356] Thereby, the connection strength between the electrode terminal and the bus bar can be further enhanced, the bending stress caused by the bus bar can be further dispersed, and the anti-deformation ability of the electrode terminal and the first housing wall can be further improved.

[0357] In some embodiments, the area of the connection region formed in the first overlapping portion is SA, and the area of all the connection regions is S. Then, SA accounts for 50% to 100% of S.

[0358] SA represents the area of the connection region formed in the first overlapping portion. S represents the area of all the connection regions. The ratio range of SA to S is between 50% and 100%, that is, 50% ≤ SA / S ≤ 100%. If the connection region is only provided in the first overlapping portion, the ratio of SA to S is 100%.

[0359] Optionally, SA / S = 50%, SA / S = 60%, SA / S = 70%, SA / S = 80%, SA / S = 90% or SA / S = 100%, etc. Of course, other values within the above range are also possible.

[0360] The measurement of SA and S can use existing area measurement methods or can also be calculated using software based on the acquired images.

[0361] Thus, on the basis of being provided in the extension portion, the connection region can also be provided in the non-extension portion region. The setting flexibility of the connection region is relatively strong, which helps to increase the area of the connection region, enhance the connection strength, and increase the current-carrying area.

[0362] In some embodiments, as Figure 7 shown, the offset distance B3 of the center line position of the connection area formed on the first extension 61 in the width direction Y of the first housing wall relative to the center line position of the first housing wall 11 in the width direction Y of the first housing wall is such that B3 is in the range of 15% to 27% of W.

[0363] B3 represents the offset distance of the center line position of the connection area formed on the first extension 61 in the width direction Y of the first housing wall relative to the center line position of the first housing wall 11 in the width direction Y of the first housing wall. The ratio range of B3 to W is between 15% and 27%, that is, 15% ≤ B3 / W ≤ 27%.

[0364] 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%, etc. Of course, other values within the above range are also possible.

[0365] By setting B3 to be not less than 15% of W, the first extension 61 is at a sufficient distance from the center, which helps to provide a sufficient safety distance between the first extension 61 and the second extension 62; by setting B3 to be not greater than 27% of W, the first extension 61 can have a certain distance from the edge of the first housing wall 11.

[0366] In some embodiments, as Figure 18 shown, the electrode terminals include a first electrode terminal 31 and a second electrode terminal 32. The first electrode terminal 31 is provided with a first protrusion 314, and the second electrode terminal 32 is provided with a first recess 315. The first protrusion 314 and the first recess 315 overlap at least partially along the wall thickness direction Z of the first housing wall, and the first protrusion 314 and the first recess 315 cooperate with each other.

[0367] The first protrusion 314 refers to a part of the structure that extends from the first electrode terminal 31 and enters the outer contour of the second electrode terminal 32. The first recess 315 refers to a recess formed relative to the surface of the second electrode terminal 32 that can accommodate the first protrusion 314. The recess can be formed by a groove or by a step. In the case where the recess is formed by a step, it can include a first-level step, or a second-level step or more levels of steps.

[0368] Here, the first protrusion 314 and the first recess 315 in the mating state can at least restrict displacement in the thickness direction Z of the first housing wall. Optionally, the first protrusion 314 and the first recess 315 in the mating state can also restrict displacement in the length direction X of the first housing wall and / or the width direction Y of the first housing wall.

[0369] Thus, through the cooperation of the first protrusion and the first recess, it is convenient to realize the support and fixation of the first electrode terminal to the second electrode terminal, improve the bending strength of the second electrode terminal, and facilitate processing; by arranging the first protrusion in the first recess, the space occupied by the first protrusion is reduced, and the space utilization rate is improved.

[0370] 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, and at least part of the first terminal plate 41 is arranged on the side of the first housing wall 11 away from the accommodation space 12. The second electrode terminal 32 includes a second terminal plate 42, and the second terminal plate 42 is arranged on the side of the first housing wall 11 away from the accommodation space 12. Along the thickness direction Z of the first housing wall, the first terminal plate 41 and the second terminal plate 42 partially overlap, and the first terminal plate 41 directly or indirectly abuts against the second terminal plate 42.

[0371] 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 there may be no terminal plate in the middle.

[0372] Thus, the bending strength of the electrode terminal 3 and the first housing wall 11 can be further improved by setting the first terminal plate 311 and the second terminal plate 321 to be engaged with each other; moreover, the first terminal plate 311 and the second terminal plate 321 can be electrically connected to each other, which is convenient for simplifying the connection structure when the two electrode terminals 3 have the same polarity.

[0373] 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, and at least part of the first terminal plate 41 is arranged on the side of the first housing wall 11 away from the accommodation space 12. The first terminal plate 41 includes a first main body portion 51 and a first extension portion 61 connected to each other. The second electrode terminal 32 includes a second terminal plate 42, and the second terminal plate 42 is arranged on the side of the first housing wall 11 away from the accommodation space 12. The second terminal plate 42 includes a second main body portion 52 and a second extension portion 62 connected to each other. Along the length direction X of the first housing wall, the first extension portion 61 and the second extension portion 62 are located between the first main body portion 51 and the second main body portion 52, and the first extension portion 61 and the second extension portion 62 are arranged along the width direction Y of the first housing wall.

[0374] In some embodiments, the first extension portion 61 and the second extension portion 62 may 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 are arranged along the width direction Y of the first housing wall; the first extension portion 61 and the second extension portion 62 may 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 are arranged along the width direction Y of the first housing wall; the first extension portion 61 and the second extension portion 62 may be arranged close to each other along the length direction X of the first housing wall, the first extension portion 61 and the second extension portion 62 are further arranged along the width direction Y of the first housing wall, and along the width direction Y of the first housing wall, the first extension portion 61 and the second extension portion 62 have an overlapping portion.

[0375] The heat dissipation performance can be improved, the supporting effect on the first housing wall and the connection strength with the busbar can be enhanced by designing the terminal board to be larger, and the degree of freedom in designing the shape of each terminal board is relatively high.

[0376] In some embodiments, along the wall thickness direction of the first housing wall 11, the overlapping portion of the first electrode terminal 31 and the second electrode terminal 32 is the 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, and W11 is in the range of 10% to 90% of W. The length direction X of the first housing wall is the length direction of the first housing wall 11, and the width direction Y of the first housing wall is the width direction of the first housing wall 11.

[0377] The overlapping region means that the second electrode terminal 32 is 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 wall thickness direction of the first housing wall 11. In Figure 21 this case, W11 is used to represent the length of the overlapping region along the width direction Y of the first housing wall.

[0378] The length of the first housing wall 11 along 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 along the width direction. In Figure 21 this case, W is used to represent the length of the first housing wall 11 along the width direction Y of the first housing wall.

[0379] The length W11 of the overlapping region along the width direction of the first housing wall may account for 10% to 90% of the length W of the first housing wall 11 along the width direction of the first housing wall, that is, W11 / W is in the range of 10% to 90%. For example, it may account for 10%, 15%, 20%, 30%, 50%, 70%, 90%, and of course, it may also be other values within the above range.

[0380] Thus, it is possible to make full use of the first housing wall 11 in the width direction Y of the first housing wall, and it is possible to surely increase the supporting force between the first electrode terminal 31 and the second electrode terminal 32, improve the bending strength of the electrode terminals, and also strengthen the strength of the first housing wall around the electrode terminals.

[0381] 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.

[0382] Exemplarily, the length W11 of the overlapping region in the width direction Y of the first housing wall may 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 may also be other values within the range of 0.5 mm to 50 mm.

[0383] Thus, it is possible to determine the length W11 of the overlapping region in the width direction of the first housing wall according to the length W of the first housing wall in the width direction, and by setting the length W11 of the overlapping region in the width direction of the first housing wall to be larger, it is possible to increase the supporting force between the first electrode terminal 31 and the second electrode terminal 32, improve the bending strength of the electrode terminals, and also strengthen the strength of the first housing wall around the electrode terminals.

[0384] In some embodiments, as Figure 14 shown, the length L11 of the overlapping region in the length direction X of the first housing wall, L11 is in the range of 0.5 mm to 6 mm.

[0385] Exemplarily, the length L11 of the overlapping region in the length direction X of the first housing wall may be 0.5 mm, 1 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm. Of course, it may also be other values within the range of 0.5 mm to 6 mm.

[0386] Thus, by setting the length L11 of the overlapping region in the length direction of the first housing wall to be smaller, it is possible to increase the fitting strength between the protruding portion and the recessed portion, and it is also beneficial to improve the space utilization rate.

[0387] In some embodiments, along the width direction Y of the first housing wall, the first extension portion 61 is offset from the central position of the first main body portion 51; and / or, along the width direction Y of the first housing wall, the second extension portion 62 is offset from the central position of the second main body portion 52.

[0388] As Figure 21As shown, the position of the dotted line O represents the central position of the first main body portion 51 along the width direction Y of the first housing wall. The dotted line O1 represents the central position of the first extension portion 61 along the width direction Y of the first housing wall, and the dotted line O2 represents the central position of the second extension portion 62 along the width direction Y of the first housing wall. Regarding the offset distance, it can be 15% to 27% of the width of the first housing wall 11.

[0389] Thus, the dimensions of the first housing wall along the width direction of the first housing wall can be fully utilized to arrange the first extension portion and the second extension portion along the width direction of the first housing wall, which is beneficial to the compact arrangement of the first electrode terminal and the second electrode terminal.

[0390] In some embodiments, the length of the long side of the first housing wall 11 is less than or equal to 450 mm.

[0391] The length of the first housing wall 11 (which can also be the length of the battery cell 10) can be less than or equal to 450 mm. For example, it can be 450 mm, 400 mm, 350 mm, 300 mm, or 200 mm.

[0392] Thus, the electrode terminals can be arranged by making full use of the relatively narrow side walls of the strip-shaped battery cells, improving the flexibility of battery cell grouping and facilitating large-area heat dissipation.

[0393] The second aspect of the present application provides a battery, including: a box body 20 and at least two battery cells 10 provided in the first aspect.

[0394] Since the battery adopts the above-mentioned battery cell 10, the heat dissipation capacity of the electrode terminals in the battery cell 10 is improved, and the service performance of the battery is improved.

[0395] In some embodiments, as Figure 15 shown, the battery cells 10 are arranged along the width direction of the first housing wall.

[0396] Thus, it is beneficial to improve the volume utilization rate of the battery.

[0397] In some embodiments, the first electrode terminal 31 includes a first electrode terminal 31, the first electrode terminal 31 includes a first main body portion 51 and a first extension portion 61 connected to each other, the second electrode terminal 32 includes a second main body portion 52 and a second extension portion 62 connected to each other. Along the length direction of the first housing wall, at least part of the first extension portion 61 and at least part of the second extension portion 62 are located between the first main body portion 51 and the second main body portion 52. In adjacent battery cells, the first extension portion 61 of one battery cell 10 and the second extension portion 62 of another battery cell 10 are arranged along the width direction Y and are electrically connected through a bus bar 2.

[0398] Since the bus bar 2 is connected to the first extension portion 61 and the second extension portion 62 located between the first main body portion 51 and the second main body portion 52, and the bending resistance of the connection portion is relatively strong, the first electrode terminal 31, the second electrode terminal 32, and the first housing wall 11 are not easily bent, deformed, or broken, thereby improving the reliability of the battery during use.

[0399] In some embodiments, in the same battery cell 10, along the width direction of the first housing wall, the first extension portion 61 and the second extension portion 62 have a first overlapping portion 91 (see Figure 7 ). In adjacent battery cells 10, the first overlapping portion 91 of one battery cell is electrically connected to the first overlapping portion 91 of another battery through the bus bar 2.

[0400] Thus, the bus bar 2 is connected to the portion where the first overlapping portion 91 is formed in the first electrode terminal 31 and the second electrode terminal 32. Since this portion has a relatively strong bending resistance, even if the bus bar 2 causes bending stress to act on the first electrode terminal 31, the second electrode terminal 32, and the first housing wall 11, the first electrode terminal 31, the second electrode terminal 32, and the first housing wall 11 are not easily bent or deformed, and are even less likely to break due to bending deformation, thereby improving the reliability of the battery during use.

[0401] In some embodiments, as Figure 17 shown, at least one box wall of the box body 20 has a boss 111a, which is formed by the box wall bulging toward the direction away from the battery cell 10. The boss 111a forms a receiving portion 111b on the side facing the battery cell 10. Along the direction perpendicular to the box wall where the boss 111a is formed, the projections of the first electrode terminal 31 and the second electrode terminal 32 do not exceed the projection of the boss 111a, and at least a part of the bus bar among the first electrode terminal 31, the second electrode terminal 32, and the bus bar 2 enters the receiving portion 111b.

[0402] Thus, it is possible to only increase the height of the box body at the positions of the first electrode terminal, the second electrode terminal, and the bus bar, thereby being able to suppress the size of the battery and being beneficial to improving the volume utilization rate of the battery.

[0403] The third aspect of the present application provides an electrical device, which includes a plurality of battery cells 10 provided in the first aspect or batteries provided in the second aspect, and the battery cells 10 or the batteries supply power to the electrical device.

[0404] Thus, it is possible to provide an electrical device having battery cells 10 or batteries with strong heat dissipation ability of the electrode terminals, thereby improving the performance of the electrical device during use.

[0405] A fourth aspect of the present application provides an energy storage device, which includes a plurality of battery cells 10 provided in the first aspect or batteries provided in the second aspect. The battery cells 10 or the batteries are configured to be able to store electrical energy and provide electrical energy.

[0406] Thereby, an energy storage device with battery cells 10 or batteries having strong heat dissipation capacity of electrode terminals can be provided, improving the performance of the energy storage device.

[0407] In a specific embodiment, the battery cell 10 includes a housing 1, an electrode assembly 7, and an electrode terminal 3. The housing 1 has an accommodation space 12. The housing 1 includes a first housing wall 11, and the first housing wall 11 is an end cover of the housing 1. The electrode assembly 7 is disposed in the accommodation space 12, and the electrode terminal 3 is disposed on the first housing wall 11. The electrode terminal 3 includes a terminal plate 4, and the terminal plate 4 is used to connect with a bus bar 2. The terminal plate 4 includes a main body portion 5 and an extension portion 6. The electrode terminal 3 adopts a partial protrusion structure to increase the perimeter around the electrode terminal 3 and increase the heat dissipation area. The protrusion structure is the extension portion 6, and the extension portion 6 is provided with a tab welding mark (as long as a part of the welding mark exists), which can increase the welding mark area and improve the overcurrent capacity.

[0408] In the same terminal plate 4, the ratio of the length of one extension portion 6 along the width direction Y of the first housing wall to the length of the main body portion 5 along the width direction Y of the first housing wall is in the range of 0.4 to 0.8. Herein, the length direction X of the first housing wall is the length direction of the first housing wall 11, and the width direction Y of the first housing wall is the width direction of the first housing wall 11. The smaller the ratio, the better, which can effectively improve the heat dissipation performance. The smaller the ratio, the more the number of extension portions can be increased, and one terminal plate 4 can have a plurality of extension portions 6.

[0409] The ratio of the length of the terminal plate 4 along the width direction Y of the first housing wall to the length of the first housing wall 11 along the width direction Y of the first housing wall is in the range of 0.6 to 0.9. Make the length of the terminal plate 4 along the width direction Y of the first housing wall as long as possible, thereby improving the heat dissipation capacity of the terminal plate 4. In one terminal plate 4, the extension portion 6 can be one or multiple. When the extension portion 6 is two, it can be symmetrically arranged with respect to the length direction X of the first housing wall.

[0410] In the same terminal board 4, the ratio of the length of the extension part 6 along the length direction X of the first housing wall to the length of the terminal board 4 along the length direction X of the first housing wall is greater than or equal to 0.5 and less than 1. The longer the length of the terminal board 4 along the length direction X of the first housing wall, the better, which can effectively improve the heat dissipation performance of the terminal board 4. The ratio of the length of the terminal board 4 along the length direction X of the first housing wall to the length of the first housing wall 11 along the length direction X of the first housing wall is in the range of 0.2 to 0.7. The longer the length of the terminal board 4 along the length direction X of the first housing wall, the better, which can improve the heat dissipation capacity of the terminal board 4.

[0411] In the same terminal board 4, the ratio of the length of the terminal board 4 along the length direction X of the first housing wall to the length of the terminal board 4 along the width direction Y of the first housing wall is in the range of 3.5 to 10. The terminal board 4 is arranged in an elongated shape to further improve the heat dissipation performance of the electrode terminal 3.

[0412] Part of the tab weld mark is arranged on the extension part 6, which can increase the weld mark area. When welding to the center of the electrode terminal 3, if S1 represents the minimum cross-sectional area for current to pass through one of the extension parts 6 and P represents the capacity of the battery cell 10, the ratio of S1 to P is in the range of 0.2 to 0.3. Among them, the unit of capacity is AL, thereby providing appropriate overcurrent capacity.

[0413] The battery cell 10 includes a first electrode terminal 31 and a second electrode terminal 32. The terminal board 4 includes a first terminal board 41 and a second terminal board 42. The first electrode terminal 31 has the first terminal board 41. The first terminal board 41 includes a first main body part 51 and a first extension part 61. The second electrode terminal 32 is arranged on the first housing wall 11. The second electrode terminal 32 has the second terminal board 42. The second terminal board 42 has a second main body part 52 and a second extension part 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 part 61 and the second extension part 62 have a first overlapping part 91. 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.

[0414] Both the first terminal board 41 and the second terminal board 42 include a connection area 93 for connecting with the bus bar 2. The bus bar 2 is used to electrically connect multiple battery cells 10 to each other. The connection area is at least formed in the first overlapping part 91. The connection area 93 arranges tabs, which can combine the original two rows of tabs into one row of tabs. If SA represents the area of the connection area 93 formed in the first overlapping part 91 and S represents the area of all the connection areas 93, then SA accounts for 50% to 100% of S.

[0415] If the offset distance of the center line position of the connection area formed on the first extension portion 61 in the width direction Y of the first housing wall relative to the center line position of the first housing wall 11 in the width direction Y of the first housing wall is represented by B3, then B3 is in the range of 15% to 27% of W. On the one hand, the material used for the original first overlapping portion 91 can be saved, the weight of the battery pack can be reduced, and the cost can be reduced. On the other hand, it is beneficial to the arrangement of the bus bars. If B3 is too small, the bus bars on two adjacent extension portions are likely to interfere; if B3 is too large, it is too close to the welding mark on another battery cell 10, which affects welding.

[0416] The various embodiments / implementation manners provided in this application can be combined with each other without contradiction.

[0417] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that: include: A housing having a receiving space, wherein the housing comprises a first housing wall; an electrode assembly, at least partially disposed in the accommodation space; An electrode terminal is arranged on the first shell wall, and the electrode terminal has a terminal plate, which is used to connect to the busbar. The terminal plate includes a main body and at least one extension portion connected to the main body, and the at least one extension portion is protruding from the main body along a wall thickness direction perpendicular to the first shell wall.

2. The battery cell according to claim 1, characterized in that: 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.

3. The battery cell according to claim 1, characterized in that: The battery cell includes at least two electrode terminals, and the at least two electrode terminals include a first electrode terminal and a second electrode terminal. The first electrode terminal includes a first main body and a first extension portion, and the second electrode terminal includes a second main body and a second extension portion. The first extension portion and the second extension portion extend toward one side close to each other along the length direction of the first shell wall; or, The first extension portion and the second extension portion extend toward a side away from each other along the length direction of the first shell wall; or, The first extending portion and the second extending portion extend toward the same side along a length direction of the first housing wall.

4. The battery cell according to claim 1, characterized in that: The terminal plate includes a plurality of extensions.

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

6. The battery cell according to claim 1, characterized in that: Along the width direction of the first housing wall, a ratio of the length of the extension portion to the length of the main body portion is in a range of 0.4 to 0.

8.

7. The battery cell according to claim 3, characterized in that: The first electrode terminal includes a first terminal plate, and the second electrode terminal includes a second terminal plate. Along the width direction of the first housing wall, a ratio of the length of the first terminal plate and the second terminal plate to the length of the first housing wall is in a range of 0.6 to 0.

9.

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

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

7.

10. The battery cell according to claim 1, characterized in that: 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, A ratio of a length of the second terminal plate along a length direction of the first housing wall to a length of the second terminal plate along a width direction of the first housing wall is in a range of 3.5 to 10.

11. The battery cell according to claim 3, characterized in that: The first electrode terminal includes a first terminal plate, at least a portion of which is disposed on a side of the first shell wall away from the accommodating space, and the second electrode terminal includes a second terminal plate, which is disposed on a side of the first shell wall away from the accommodating space.

12. The battery cell according to claim 3, characterized in that: 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 the accommodation space, and the second electrode terminal includes a second terminal plate, at least a portion of which is disposed on a side of the first housing wall facing the accommodation space. Along the wall thickness direction of the first housing wall, the first terminal plate is at least partially arranged between the second terminal plate and the first housing wall; or, Along the wall thickness direction of the first housing wall, the second terminal plate is at least partially arranged between the first terminal plate and the first housing wall.

13. The battery cell according to claim 11, characterized in that: The first electrode terminal further includes a first terminal plate, at least a portion of which is disposed on a side of the first housing wall facing the accommodation space, and the second electrode terminal further includes a second terminal plate, at least a portion of which is disposed on a side of the first housing wall facing the accommodation space. The first main body and the first terminal plate are directly connected via a first connecting column; The second main body and the second terminal plate are directly connected via a second connecting column.

14. The battery cell according to any one of claims 11 to 13, characterized in that: The electrode assembly includes a first pole piece and a second pole piece with opposite polarities, The first electrode terminal is electrically connected to the first pole piece, and the second electrode terminal is electrically connected to the second pole piece.

15. The battery cell according to claim 13, characterized in that: Along the wall thickness direction of the first shell wall, the second terminal plate is at least partially disposed between the first terminal plate and the first shell wall, and the first terminal plate abuts against the second terminal plate.

16. The battery cell according to claim 15, characterized in that: 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 protruding portion and the first recessed portion at least partially overlap along the wall thickness direction of the first shell wall, and the first protruding portion and the first recessed portion cooperate with each other.

17. The battery cell according to claim 16, characterized in that: The battery cell further includes a first insulating member, the first insulating member is 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 against the second electrode terminal.

18. The battery cell according to claim 17, characterized in that: 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, characterized in that: The first electrode terminal, the first insulating member and the second electrode terminal partially overlap along the wall thickness direction of the first housing wall, and the portion of the first electrode terminal overlapping with the first insulating member and the second electrode terminal abuts against the first insulating member.

20. The battery cell according to any one of claims 16 to 19, characterized in that: The first extension portion is connected to the first terminal plate through a third connecting column. The first recessed portion is disposed on a side of the second extending portion facing the first electrode terminal, and the first protruding portion is disposed on a side of the first extending portion facing the second electrode terminal.

21. The battery cell according to any one of claims 17 to 19, characterized in that: The first recessed portion includes a first step portion and a second step portion, and the second step portion is arranged on a side of the first step portion away from the first terminal plate; The first protrusion includes a protruding portion provided on the first terminal plate, a portion of the second terminal plate is located between the protruding portion and the first shell wall along the wall thickness direction of the first shell wall, and the protruding portion is at least partially accommodated in a step space formed by the first step portion; The first protrusion also includes a first covering portion provided by the first insulating member. Along the wall thickness direction of the first shell wall, a portion of the second terminal plate is located between the first covering portion and the first shell wall, and the first covering portion is at least partially accommodated in the step space formed by the second step portion.

22. The battery cell according to claim 21, characterized in that: Along the wall thickness direction of the first housing wall, the surface of the first covering portion on the side facing away from the first housing wall does not exceed the surface of the first terminal plate on the side facing away from the housing wall; and / or, Along 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 extend beyond a surface of the second terminal board on a side facing away from the first housing wall.

23. The battery cell according to claim 21, characterized in that: Along the wall thickness direction of the first shell wall, the height difference between the surface of the first terminal plate facing away from the shell wall and the surface of the second terminal plate facing away from the first shell wall is greater than or equal to 0 and does not exceed 0.5 mm.

24. The battery cell according to claim 23, characterized in that: The battery cell further includes 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, characterized in that: The first insulating member and the second insulating member are integrally formed.

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

27. The battery cell according to claim 26, characterized in that: The first recess and the second recess form the same recess.

28. The battery cell according to any one of claims 16 to 19, characterized in that: The first recessed portion is disposed on a side of the second extending portion facing the first electrode terminal, and the first protruding portion is disposed on a side of the first main body portion facing the second electrode terminal.

29. The battery cell according to claim 28, characterized in that: The first electrode terminal is further provided with a second recessed portion, and the second electrode terminal is further provided with a second protruding portion, the second protruding portion and the second recessed portion at least partially overlap along the wall thickness direction of the first shell wall, and the second protruding portion and the second recessed portion cooperate with each other. The second recessed portion is disposed on a side of the first extending portion facing the second electrode terminal, and the second protruding portion is disposed on a side of the second main body portion facing the first electrode terminal.

30. The battery cell according to claim 29, characterized in that The second recessed portion includes a third step portion and a fourth step portion, and the fourth step portion is arranged on a side of the third step portion away from the second electrode terminal; The second protrusion includes a protruding portion provided on the second electrode terminal, a portion of the first electrode terminal is located between the protruding portion and the first shell wall along the wall thickness direction of the first shell wall, and the protruding portion is at least partially accommodated in a step space formed by the third step portion; The second protrusion also includes a second covering portion provided by the second insulating member. Along the wall thickness direction of the first shell wall, a portion of the first electrode terminal is located between the second covering portion and the first shell wall, and the second covering portion is at least partially accommodated in the step space formed by the fourth step portion.

31. The battery cell according to claim 1, characterized in that The minimum cross-sectional area of ​​the extension portion for current to pass through is S1, and the capacity of the battery cell is P. Then, the ratio of S1 to P is in the range of 0.2 to 0.3, wherein the unit of the capacity is Ah.

32. The battery cell according to claim 3, characterized in that: 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 housing wall, the first extending portion and the second extending portion have a first overlapping portion.

33. The battery cell according to claim 32, characterized in that: A material of the first main body portion and / or the second main body portion is different from a material of the first overlapping portion.

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

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

36. The battery cell according to any one of claims 32 to 34, characterized in that: Along the length direction of the first housing wall, the first main body portion and the second main body portion have a second overlapping portion.

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

38. The battery cell according to claim 3, characterized in that: Along the length direction of the first housing wall and the width direction of the first housing wall, the closest distance between the first electrode terminal and the second electrode terminal is greater than or equal to 0.3 mm.

39. The battery cell according to any one of claims 32 to 34, characterized in that: 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 area for connecting to a busbar for electrically connecting the plurality of battery cells to each other, and the connection area is formed at least at the first overlapping portion.

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

41. The battery cell according to claim 39, characterized in that The area of ​​the connection region of the first overlapping portion is SA, and the area of ​​the entire connection region is S, then SA accounts for 50% to 100% of S.

42. The battery cell according to claim 39, characterized in that The offset distance of the centerline position of the connection area formed in the first extension portion in the width direction of the first shell wall relative to the centerline position of the first shell wall in the width direction of the first shell wall is B3, and B3 is in the range of 15% to 27% of W.

43. The battery cell according to any one of claims 1 to 9, characterized in that: The electrode terminal includes a first electrode terminal and a second electrode terminal, The first electrode terminal is provided with a first protrusion, and the second electrode terminal is provided with a first recess. The first protrusion and the first recess at least partially overlap along the wall thickness direction of the first shell wall, and the first protrusion and the first recess cooperate with each other.

44. The battery cell according to any one of claims 1 to 9, characterized in that: The electrode terminal includes a first electrode terminal and a second electrode terminal, The first electrode terminal includes a first terminal plate, at least a portion of which is disposed on a side of the first housing wall away from the accommodation space. The second electrode terminal includes a second terminal plate, and the second terminal plate is arranged on a side of the first housing wall away from the accommodation space. Along the wall thickness direction of the first housing wall, the first terminal plate partially overlaps with the second terminal plate, and the first terminal plate directly or indirectly abuts against the second terminal plate.

45. The battery cell according to any one of claims 1 to 9, characterized in that: The electrode terminal includes a first electrode terminal and a second electrode terminal, The first electrode terminal includes a first terminal plate, at least a portion of which is disposed on a side of the first housing wall away from the accommodation space, and the first terminal plate includes a first main body portion and a first extension portion connected to each other. The second electrode terminal includes a second terminal plate, the second terminal plate is arranged on a side of the first housing wall away from the accommodation space, and the second terminal plate includes a second main body portion and a second extension portion connected to each other. Along the length direction of the first 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, and the first extension portion and the second extension portion are arranged along the width direction of the first shell wall.

46. ​​The battery cell according to claim 3, characterized in that Along the wall thickness direction of the first shell wall, the overlapping part of the first electrode terminal and the second electrode terminal is the overlapping area, and 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 in the range of 10% to 90% of W.

47. The battery cell according to claim 46, characterized in that W11 is in the range of 0.5 mm to 50 mm.

48. The battery cell according to claim 46 or 47, characterized in that: A length of the overlapping region along the length direction of the first shell wall is L11, and L11 is in the range of 0.5 mm to 6 mm.

49. The battery cell according to claim 3, characterized in that: Along the width direction of the first shell wall, the first extension portion is offset relative to the center position of the first main body portion; and / or, The second extension portion is offset relative to a center position of the second main body portion along a width direction of the first housing wall.

50. The battery cell according to claim 1, characterized in that The length of the first shell wall is less than or equal to 450 mm.

51. A battery, characterized in that: The invention comprises a casing and at least two battery cells according to any one of claims 1 to 50.

52. The battery according to claim 51, characterized in that The battery cells are arranged along the width direction of the first housing wall.

53. The battery according to claim 52, characterized in that The battery cell includes at least two electrode terminals, and the at least two electrode terminals include a first electrode terminal and a second electrode terminal. The first electrode terminal includes a first main body 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, Along the length direction of the first shell wall, at least a portion of the first extension portion and at least a portion of the second extension portion are located between the first main body portion and the second main body portion. In the adjacent battery cells, the first extending portion of one battery cell and the second extending portion of another battery cell are arranged along the width direction and are electrically connected through a busbar.

54. The battery according to claim 53, characterized in that 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 shell wall, and in adjacent battery cells, the first overlapping portion of one battery cell is electrically connected to the first overlapping portion of another battery cell through the busbar.

55. The battery according to claim 54, characterized in that In the adjacent battery cells, at least one of the first main body portion of one of the battery cells and the second main body portion of another of the battery cells is electrically connected to the busbar.

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

57. An electrical device, characterized in that: The electrical device comprises a plurality of battery cells according to any one of claims 1 to 50, or a battery according to any one of claims 51 to 56, and the battery cells or the battery provide power for the electrical device.

58. An energy storage device, characterized in that: The energy storage device comprises a plurality of battery cells according to any one of claims 1 to 50, or a battery according to any one of claims 51 to 56, wherein the battery cells or the battery are used to store electrical energy and can provide electrical energy.

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