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

Abstract

The utility model discloses a battery monomer, a battery, a power utilization device and an energy storage device. The battery cell includes: a housing having an accommodation space, the housing including a first housing wall; the electrode assembly is arranged in the accommodating space; the first electrode terminal is arranged on the first shell wall, and the first electrode terminal comprises a first connecting part connected with the first bus piece; the second electrode terminal is arranged on the first shell wall, and the second electrode terminal comprises a second connecting part connected with the second bus piece; the first connecting part and the second connecting part are arranged in the width direction of the first shell wall, and the projections of the first connecting part and the second connecting part in the width direction of the first shell wall are at least partially overlapped. The electrode terminal and the shell of the battery monomer provided by the embodiment of the utility model have relatively high bending resistance. According to the battery, the power utilization device and the energy storage device, due to the adoption of the battery monomer, the use reliability is relatively high.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery cells, batteries, electrical devices and energy storage devices. Background Art

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

[0003] As the industry's requirements for battery volume utilization and lightweight continue to increase, the battery cell shell tends to be larger and thinner. In this case, the battery cell shell tends to be insufficiently strong and prone to bending and deformation. In addition, the electrode terminals provided in the shell sometimes aggravate this tendency. Therefore, how to improve the strength of the shell wall of the battery cell shell with the electrode terminals is one of the research directions of the industry. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery cell, a battery, an electrical device and an energy storage device capable of improving the bending strength of a shell wall of a battery cell having electrode terminals disposed therein.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell having a accommodating space, the shell comprising a first shell wall; an electrode assembly disposed in the accommodating space; and a first electrode terminal disposed on the first shell wall, the first electrode terminal comprising a first connecting portion for connecting to a first bus bar; a second electrode terminal disposed on the first shell wall, the second electrode terminal comprising a second connecting portion for connecting to a second bus bar; the first connecting portion and the second connecting portion are arranged along the width direction of the first shell wall, and the projections of the first connecting portion and the second connecting portion along the width direction of the first shell wall at least partially overlap.

[0006] In the embodiment of the present application, since the first connection portion and the second connection portion are arranged along the width direction of the first shell wall, and the projections along the width direction of the first shell wall overlap, the first electrode terminal and the second electrode terminal are arranged in a compact position, which helps to cooperate with each other to form a structural reinforcement with a larger area, thereby improving the structural strength of the first shell wall, especially the bending strength. Since the first connection portion and the second connection portion are respectively used to connect to the busbar, after the multiple battery cells are arranged along the width direction of the first shell wall, the first connection portion and the second connection portion of the adjacent battery cells are located oppositely, which helps to shorten the connection path of the busbar.

[0007] In some embodiments, the first electrode terminal also includes a first main body connected to the first connecting portion, and the second electrode terminal also includes a second main body connected to the second connecting portion, and along the length direction of the first shell wall, at least a portion of the first connecting portion and at least a portion of the second connecting portion are located between the first main body and the second main body.

[0008] Since the first connection part is connected to the first main body part, and the second connection part is connected to the second main body part, the force-bearing area is further increased by the first main body part and the second main body part, and the bending strength of the first shell wall is improved. Since the first connection part and the second connection part are located between the first main body part and the second main body part along the length direction of the first shell wall, and the first connection part and the second connection part have an overlapping part along the width direction of the first shell wall, the synergistic effect of the two electrode terminals can be used to improve the bending strength of the area where the electrode terminals are set in the first shell wall. Moreover, the first electrode terminal and the second electrode terminal can be set as compactly as possible, which is conducive to the use of the non-electrode terminal setting area of ​​the first shell wall, and further conducive to improving the volume utilization of the battery pack.

[0009] In some embodiments, the length of the first main body along the width direction of the first shell wall is greater than or equal to the first connecting portion; and / or the length of the second main body along the width direction of the first shell wall is greater than or equal to the second connecting portion.

[0010] Since the length of the first shell wall of the first main body in the width direction is greater than or equal to the first connection part, at least one side of the first shell wall of the first connection part in the width direction has a space, which helps to stagger the first connection part and the second connection part and other protruding structures, thereby improving the flexibility of the arrangement of the first electrode terminal and helping to improve the space utilization rate on the first shell wall. Since the length of the first shell wall of the second main body in the width direction is greater than or equal to the second connection part, at least one side of the first shell wall of the second connection part in the width direction has a space, which helps to stagger the second connection part and the first connection part and other protruding structures, thereby improving the flexibility of the arrangement of the second electrode terminal and helping to improve the space utilization rate on the first shell wall. Moreover, setting the first main body and the second main body larger is conducive to installing the connecting column on the first main body and the second main body, and is conducive to improving the installation stability of the electrode terminal relative to the first shell wall. Setting the width of the first connection part and the second connection part along the second direction smaller is conducive to reducing the weight of the electrode terminal and even the battery cell and the battery pack. Moreover, the first connection part and the second connection part can also be used to form a bottleneck of the overcurrent bottleneck, thereby eliminating the process of separately processing the bottleneck of the overcurrent bottleneck.

[0011] In some embodiments, along the width direction of the first shell wall, the first connecting portion is offset relative to the center position of the first main body portion; and / or, along the width direction of the first shell wall, the second connecting portion is offset relative to the center position of the second main body portion.

[0012] Since the first connection portion is offset relative to the center position of the first main body portion and the second connection portion is offset relative to the center position of the second main body portion along the width direction of the first shell wall, the first connection portion and the second connection portion are staggered with each other, which can not only make full use of the space, but also make the first electrode terminal and the second electrode terminal arranged more concentratedly, thereby improving the strength of the area where the electrode terminals are located, which is beneficial to reducing the risk of bending and deformation in the area where the electrode terminals are located.

[0013] In some embodiments, the projections of the first main body portion and the second connecting portion along the length direction of the first shell wall overlap, and / or the projections of the second main body portion and the first connecting portion along the length direction of the first shell wall overlap.

[0014] Thus, by arranging the first main body and the second connecting part to overlap in the length direction of the first shell wall, and / or the second main body and the first connecting part to overlap in the length direction of the first shell wall, the synergistic effect of the two electrode terminals can be used to improve the bending strength of the area in the first shell wall where the electrode terminal is set. 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 setting area of ​​the first shell wall, and further beneficial to improving the volume utilization of the battery pack. In some embodiments, a gap is formed between the first connecting part and the first main body, and the second connecting part is at least partially located in the gap.

[0015] Thus, the second connecting portion is filled in the gap between the first connecting portion and the first main body portion, so that the second electrode terminal and the first electrode terminal are close to each other. On the one hand, the strength of the area where the electrode terminal is located is improved, which is beneficial to reducing the risk of bending and deformation in the area where the electrode terminal is located; on the other hand, it is beneficial to utilize the non-electrode terminal setting area of ​​the first shell wall, which is beneficial to improve the volume utilization of the battery pack.

[0016] In some embodiments, the length of the first shell wall along the length direction of the first shell wall is L, the length of the first connecting portion along the length direction of the first shell wall is A1, and the length of the second connecting portion along the length direction of the first shell wall is A2, then 10%≤A1 / L≤40%, and / or 10%≤A2 / L≤40%.

[0017] By setting A1 and / or A2 to be no less than 10% of L, the first overlapping portion can provide sufficient structural strength; by setting A1 and / or A2 to be no more than 40% of L, the material consumption of the first overlapping portion is controlled within a reasonable range.

[0018] In some embodiments, along the width direction of the first shell wall, the first connecting portion and the second connecting portion have a first overlapping portion, and the length of the first overlapping portion along the length direction of the first shell wall is in the range of 3 mm to 50 mm.

[0019] Thus, the first overlapping portion can take into account both strength requirements and material saving.

[0020] In some embodiments, along the width direction of the first shell wall, the first main body portion and the second main body portion are located between the first connecting portion and the second connecting portion.

[0021] Therefore, since the first main body and the second main body are located between the first connecting portion and the second connecting portion along the width direction of the first shell wall, 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 area of ​​the first shell wall, and further beneficial to improving the volume utilization of the battery pack.

[0022] In some embodiments, along the length direction of the first shell wall, the first main body portion and the second main body portion have a second overlapping portion, the length of the first shell wall along the width direction of the first shell wall is W, and the length of the second overlapping portion along the width direction of the first shell wall is B, then B is in the range of 20% to 90% of W.

[0023] In this way, the second overlapping part can provide sufficient structural strength and space can be left on both sides of the width direction of the first shell wall of the second overlapping part, which helps to reduce the risk of short circuit between the main bodies of adjacent battery cells when multiple battery cells are arranged along the width direction of the first shell wall.

[0024] In some embodiments, the length of the first main body along the width direction of the first shell wall is B1, the length of the second main body along the width direction of the first shell wall is B2, and the absolute value of the difference between B1 and B2 is greater than or equal to 0 mm.

[0025] Thus, the lengths in the width direction of the first housing wall of the first main body portion and the first housing wall of the second main body portion may be different.

[0026] In some embodiments, the absolute value of the difference between B1 and B2 is in the range of 0 mm to 50 mm.

[0027] In some embodiments, along the length direction of the first shell wall and the width direction of the first shell wall, the closest distance between the first electrode terminal and the second electrode terminal is greater than or equal to 0.3 mm.

[0028] Thus, a safe distance is provided between the first electrode terminal and the second electrode terminal, which helps to reduce the risk of accidental connection between the first electrode terminal and the second electrode terminal.

[0029] In some embodiments, along the length direction of the first shell wall and the width direction of the first shell wall, the closest distance between the first electrode terminal and the second electrode terminal is greater than or equal to 2.0 mm.

[0030] Thus, a safe distance is set between the first electrode terminal and the second electrode terminal, and even if an insulating member is not used to isolate the two electrode terminals, the risk of accidental connection between the first electrode terminal and the second electrode terminal can be reduced.

[0031] In some embodiments, each of the first electrode terminal and the second electrode terminal includes a connection area for connecting to a bus bar, and the bus bar is used to electrically connect the plurality of battery cells to each other.

[0032] Thus, the busbar electrically connects adjacent battery cells through the connection region.

[0033] In some embodiments, along the width direction of the first shell wall, the first connecting portion and the second connecting portion have a first overlapping portion, and the connecting area is at least formed in the first overlapping portion.

[0034] Thus, the busbar at least connects the connection parts of adjacent battery cells. After the battery cells are arranged, the first overlapping parts extend in the same direction. When the busbar is connected to the connection area located in the first overlapping part, the connection path can be shortened, which helps to save busbar materials.

[0035] In some embodiments, the connection area is also formed in at least any one of the first body portion and the second body portion.

[0036] Since the connection area is also formed in the first main body, the first electrode terminal has a larger connection area, which helps to improve the connection strength between the busbar and the first electrode terminal and increase the flow area. Since the connection area is also formed in the second main body, the second electrode terminal has a larger connection area, which helps to improve the connection strength between the busbar and the second electrode terminal and increase the flow area.

[0037] In some embodiments, the area of ​​the connection region formed in the first overlapping portion is SA, the area of ​​the entire connection region is S, and SA accounts for 50% to 100% of S.

[0038] Therefore, the connection area can be set in the area of ​​the non-connection part in addition to being set in the connection part. The setting flexibility of the connection area is strong, which helps to increase the area of ​​the connection area, improve the connection strength, and increase the flow area.

[0039] In some embodiments, the offset distance of the centerline position of the connection area formed in the first connection 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.

[0040] By setting B3 not less than 15% of W, the first connection part has a sufficient distance from the center, which helps to separate the first connection part from the second connection part by a sufficient safety distance; by setting B3 not greater than 27% of W, the first connection part can have a certain distance from the edge of the first shell wall.

[0041] In some embodiments, 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 shell wall, and the first insulating member abuts against the second electrode terminal.

[0042] 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.

[0043] In some embodiments, the electrode assembly includes a first electrode piece and a second electrode piece with opposite polarities, the first electrode terminal is electrically connected to the first electrode piece, and the second electrode terminal is electrically connected to the second electrode piece.

[0044] In this way, electrode terminals with opposite polarities can be arranged on the first shell wall of the battery cell, which is beneficial to reducing the space occupied by the busbar and the like, and is also beneficial to arranging other structural parts such as heat exchangers on other shell walls of the battery cell, which is beneficial to improving the volume utilization of the battery.

[0045] In some embodiments, the first insulating member is partially disposed between the first electrode terminal and the first housing wall.

[0046] This makes it possible to insulate the first electrode terminal from the first case wall.

[0047] In some embodiments, along the wall thickness direction of the first shell 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.

[0048] Thus, the bending deformation of the second electrode terminal can be limited by the first electrode terminal and the first insulating member, and the first electrode terminal and the second electrode terminal are insulated from each other, so that the support and fixation of the second electrode terminal by the first electrode terminal assembly can be further strengthened, and the ability of each electrode terminal to resist bending deformation can be improved; and the strength of the area where the electrode terminal is set in the first shell wall can be strengthened; in addition, the polarity setting of the electrode terminal has a high degree of freedom.

[0049] In some embodiments, 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, 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, and the first insulating member is fixed to the first terminal plate; along the wall thickness direction of the first shell wall, the first terminal plate, the first insulating member and the second terminal plate partially overlap, and the second terminal plate is partially disposed between the first insulating member and the first shell wall, and the first terminal plate abuts against the first insulating member.

[0050] Thus, a structure for supporting and fixing the second electrode terminal by the first electrode terminal assembly can be formed on the side of the first housing wall away from the accommodation space, and the second electrode terminal can be restricted from bending and deforming in a direction away from the first housing wall. Accordingly, the bending resistance of this area in the first housing wall is improved.

[0051] In some embodiments, the first electrode terminal includes a first terminal disc, and the first terminal disc is at least partially arranged on a side of the first shell wall facing the accommodating space; the second electrode terminal includes a second terminal disc, and the second terminal disc is arranged on a side of the first shell wall facing the accommodating space; along the wall thickness direction of the first shell wall, the first terminal disc is at least partially arranged 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 arranged between the first terminal disc and the first shell wall.

[0052] 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 connected to the pole ear of the electrode assembly through the terminal disc, and the heat dissipation, the supporting effect on the first shell wall and the connection strength with the busbar can be improved by designing the terminal plate to be larger, and the shape design freedom of the terminal plate and the terminal disc is relatively high. Moreover, the terminal plate and the terminal plate clamp the first shell wall from the inner and outer sides of the outer shell respectively, which can improve the bending strength of the first shell wall. Moreover, the ability of the first terminal disc or the second terminal disc to resist bending deformation can be improved by setting the second terminal disc and the first terminal disc to abut each other, so as to further improve the bending strength of the electrode terminal and the first shell wall.

[0053] In some embodiments, the first electrode terminal assembly is provided with a first protrusion, and the second electrode terminal is provided with a first recessed portion, the first protrusion and the first recessed portion at least partially overlap along the wall thickness direction of the first shell wall, and the first protrusion and the first recessed portion cooperate with each other.

[0054] 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.

[0055] In some embodiments, the first recessed portion includes a first step portion and a second step portion, the second step portion is arranged on a side of the first step portion away from the first electrode terminal assembly; the first protruding portion includes an extension portion provided on the first electrode terminal, and along the wall thickness direction of the first shell wall, a portion of the second electrode terminal is located between the extension portion and the first shell wall, and the extension portion is at least partially accommodated in the step space formed by the first step portion; the first protruding portion also includes a covering portion provided on the first insulating member, and along the wall thickness direction of the first shell wall, a portion of the second electrode terminal is located between the covering portion and the first shell wall, and the covering portion is at least partially accommodated in the step space formed by the second step portion.

[0056] Thus, the bending deformation of the second electrode terminal can be limited by the cooperation between the extension and the first step portion, and the extension is further at least partially accommodated in the first step portion, so as to reduce the space occupied by the extension and improve the space utilization. By providing the covering portion, the creepage distance on the surface of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, by accommodating the covering portion in the step portion, the covering portion does not occupy additional space, thereby improving the space utilization.

[0057] In some embodiments, along the wall thickness direction of the first shell wall, the surface of the covering portion on the side facing away from the first shell wall does not exceed the surface of the first terminal board on the side facing away from the shell wall; and / or, along the wall thickness direction of the first shell wall, the surface of the covering portion on the side facing away from the first shell wall does not exceed the surface of the second terminal board on the side facing away from the first shell wall.

[0058] Since the surface of the covering portion on the side facing away from the first shell wall does not exceed the surface of the first terminal plate and / or the second terminal plate on the side facing away from the first shell wall, the 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 along the wall thickness direction of the first shell wall; and to a certain extent, interference between the covering portion and the busbar is avoided, thereby facilitating reliable connection of the busbar and the first terminal plate and the second terminal plate.

[0059] In some embodiments, 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, the second protruding portion and the second recessed portion cooperate with each other, the second recessed portion is arranged on the side of the first connecting portion facing the second electrode terminal, and the second protruding portion is arranged on the side of the second main body portion facing the first electrode terminal.

[0060] Thus, the second recessed portion provided in the first connection portion can be abutted by the second protruding portion provided in the second main body portion and fixed between the second recessed portion and the first shell wall, thereby preventing the first connection portion from tilting away from the first shell wall due to its longer extension to a certain extent, thereby improving the bending strength of the first connection portion and the entire first electrode terminal. And further enhance the ability of the first electrode terminal assembly and the second electrode terminal to support and fix each other. Thus, even if the first connection portion is not fixed to the first shell wall by rivets, connecting columns, etc., the first connection portion can be reliably in contact with the first shell wall, and the risk of poor sealing caused by installing rivets, connecting columns, etc. can also be reduced.

[0061] In some embodiments, the second recessed portion includes a third step portion and a fourth step portion, the fourth step portion being disposed on a side of the third step portion away from the second electrode terminal; the second protruding portion includes an extension portion provided on the second electrode terminal, a portion of the first electrode terminal is located between the extension portion and the first shell wall along the wall thickness direction of the first shell wall, and the extension portion is at least partially accommodated in a step space formed by the third step portion; the second protruding portion also includes a second covering portion provided on the second insulating member, a portion of the first electrode terminal is located between the second covering portion and the first shell wall along the wall thickness direction of the first shell wall, and the second covering portion is at least partially accommodated in the step space formed by the fourth step portion.

[0062] Thus, the bending deformation of the first electrode terminal can be limited by the cooperation between the extension and the third step portion, and the extension is further at least partially accommodated in the third step portion, so as to reduce the space occupied by the extension and improve the space utilization. By providing the second covering portion, the creepage distance on the surface of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, by accommodating the second covering portion in the step portion, the second covering portion does not occupy additional space, thereby improving the space utilization.

[0063] In some embodiments, the battery cell further includes a second insulating member, wherein the second insulating member is at least partially disposed between the first terminal plate and the first housing wall.

[0064] This allows the first electrode terminal to be insulated from the outer casing of the battery cell, and therefore is applicable not only to designs in which the outer casing is charged but also to designs in which the outer casing is not charged.

[0065] In some embodiments, the first recessed portion is disposed on a side of the second connecting 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.

[0066] Thus, the first recessed portion provided on the second connection 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 shell wall, thereby preventing the second connection portion from warping away from the first shell wall due to its longer extension to a certain extent, thereby improving the bending strength of the second connection portion and the entire second electrode terminal. Even if the busbar or the like exerts a pulling force on the electrode terminal, the electrode terminal is not easy to bend or break, thereby improving the connection reliability between the busbar and the electrode terminal.

[0067] In some embodiments, a first recess and a second recess are formed in the first shell wall, and at least a portion of the first insulating member and at least a portion of the second insulating member are located in the first recess and the second recess, respectively.

[0068] This helps to improve the installation strength of the insulating member relative to the first shell wall, reduce the possibility of displacement of the insulating member along the surface of the first shell wall, and facilitate the positioning of the insulating member and the first shell wall during assembly.

[0069] In some embodiments, the first connecting column is provided in the first main body, and the first connecting column is connected to the first pole ear. The second connecting column is provided in the second main body, and the second connecting column is connected to the second pole ear. The material of the first main body and / or the second main body is different from the material of the first overlapping part.

[0070] Therefore, when the materials of the first pole tab and the second pole tab are different, the material of the main body can be selected to be the material of the corresponding pole tab to achieve a stronger conduction effect.

[0071] In some embodiments, the length of the first shell wall along the length direction of the first shell wall is L, and L is less than or equal to 450 mm.

[0072] Thus, the first housing wall has a length sufficient to accommodate the first electrode terminal and the second electrode terminal.

[0073] In a second aspect, an embodiment of the present application further provides a battery, comprising a housing and the battery cell provided in the first aspect.

[0074] Since the battery includes a battery cell with relatively strong structural strength, it helps to ensure that the battery can still operate normally after being subjected to bumps and impacts, thereby improving the reliability of battery use.

[0075] In some embodiments, the battery cells are arranged along the width direction of the first shell wall, and in adjacent battery cells, the first connection portion of one battery cell at least partially overlaps with the second connection portion of another battery cell along the width direction of the first shell wall and is electrically connected through a busbar.

[0076] Since the battery cells are arranged along the width direction of the first shell wall, and the first connection portion and the second connection portion at least partially overlap along the width direction of the first shell wall, the first connection portion and the second connection portion of adjacent battery cells are adjacent to each other. Since the first connection portion and the second connection portion on adjacent battery cells are connected by the busbar, and the first connection portion and the second connection portion on adjacent battery cells are adjacent to each other, it is helpful to shorten and simplify the connection path of the busbar, and save the material of the busbar.

[0077] In some embodiments, in adjacent battery cells, the first overlapping portion of the first connecting portion of one battery cell is electrically connected to the first overlapping portion of the second connecting portion of another battery cell through a busbar.

[0078] Since the battery cells are arranged along the width direction of the first shell wall, the first overlapping portion of the first connecting portion and the first overlapping portion of the second connecting portion are arranged along the width direction of the first shell wall. By connecting the first overlapping portion of the first connecting portion of one battery cell and the first overlapping portion of the second connecting portion of another battery cell through the busbar, the busbar is arranged along the width direction of the first shell wall, which helps to shorten and simplify the connection path of the busbar and save the material of the busbar.

[0079] In some embodiments, among 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.

[0080] Since the busbar can be connected to the main body in addition to the connecting portion, the busbar and the electrode terminal can have a larger connection area, which helps to enhance the current flow capacity.

[0081] In some embodiments, at least one box wall of the box body has a boss, and the boss is formed by the box wall bulging in a direction away from the battery cell. The boss forms a accommodating portion on a side facing the battery cell, and along a direction perpendicular to the box wall on which the boss is formed, the projections of the first electrode terminal and the second electrode terminal do not exceed the projection of the boss, and the first electrode terminal and / or the second electrode terminal are at least partially accommodated in the accommodating portion.

[0082] Thus, only the height of the box body where the first electrode terminal and / or the second electrode terminal is located can be increased, thereby reducing the size of the battery and facilitating improving the volume utilization of the battery.

[0083] In a third aspect, an embodiment of the present application further provides an electrical device, which includes a plurality of battery cells provided in the first aspect or a battery provided in the second aspect, and the battery cells or the battery provide power for the electrical device.

[0084] This helps the electrical device to adapt to working conditions such as bumps and vibrations, and improves the operating stability of the electrical device.

[0085] In a fourth aspect, an embodiment of the present application further provides an energy storage device, which includes a plurality of battery cells provided in the first aspect or a battery provided in the second aspect, wherein the battery cells or the battery are used to store electrical energy and can provide electrical energy.

[0086] This helps to make the energy storage device suitable for operating conditions such as bumps and vibrations, and improves the stability of energy storage in the energy storage device.

[0087] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0089] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present application;

[0090] Figure 2 A schematic diagram of an energy storage device provided in one embodiment of the present application;

[0091] Figure 3 A schematic diagram of a battery provided in one embodiment of the present application;

[0092] Figure 4 A three-dimensional diagram of a battery cell provided in one embodiment of the present application;

[0093] Figure 5 A three-dimensional diagram of a battery cell provided in another embodiment of the present application;

[0094] Figure 6 A three-dimensional diagram of a battery cell provided in yet another embodiment of the present application;

[0095] Figure 7 A side view of a battery cell provided in one embodiment of the present application;

[0096] Figure 8 for Figure 7 CC section view in;

[0097] Fig. 9 A schematic diagram of forming a first recess and a second recess on a first housing wall according to an embodiment of the present application;

[0098] Fig.10 An exploded view of a top cover of a battery cell provided in one embodiment of the present application;

[0099] Fig.11A top view of a first housing wall provided in an embodiment of the present application;

[0100] Fig.12 for Fig.11 DD section view in;

[0101] Fig.13 for Fig.12 A partial enlarged view of part E in FIG.

[0102] Fig.14 A top view of a first housing wall provided in accordance with another embodiment of the present application;

[0103] Fig.15 A top view of a first housing wall provided for yet another embodiment of the present application;

[0104] Fig.16 A schematic diagram of forming a connection area at an electrode terminal according to an embodiment of the present application;

[0105] Fig.17 A schematic diagram of forming a connection area at an electrode terminal according to another embodiment of the present application;

[0106] Fig.18 A three-dimensional diagram of a busbar provided by an embodiment of the present application connecting adjacent battery cells;

[0107] Fig.19 A top view of a busbar provided in an embodiment of the present application connecting adjacent battery cells;

[0108] Fig. 20 A three-dimensional diagram of a busbar provided by another embodiment of the present application connecting adjacent battery cells;

[0109] Fig.21 A three-dimensional diagram of a busbar provided in another embodiment of the present application connecting adjacent battery cells;

[0110] Fig. 22 A three-dimensional diagram of a battery cell provided in yet another embodiment of the present application;

[0111] Fig.23 A schematic diagram of a battery provided with a boss according to an embodiment of the present application;

[0112] Fig.24 for Fig.23 Middle FF section view;

[0113] Fig.25 A schematic diagram of a battery cell provided with a first protruding portion and a first recessed portion according to an embodiment of the present application;

[0114] Fig.26 for Fig.25 A local enlarged view of part G in FIG.

[0115] Fig. 27 A schematic diagram of a battery cell provided with a second protrusion according to an embodiment of the present application;

[0116] Fig.28 for Fig. 27 Middle HH section view;

[0117] Fig.29 for Fig.28 A partial enlarged view of part J in the middle.

[0118] Description of Reference Numerals

[0119] 1000, vehicle; 2000, energy storage device; 100, battery; 200, controller; 300, motor; 10, battery cell; 20, housing; 1, housing; 11, first housing wall; 111, first recess; 112, second recess; 2, busbar; 31, first electrode terminal; 311, first terminal plate; 312, first connecting column; 314, first protrusion; 315, first recess; 3151, first step; 3152, second step; 317, second recess; 3171, third step; 3172, fourth step; 32, second electrode terminal; 321, second terminal Disk; 322, second connecting column; 327, second protrusion; 41, first terminal plate; 42, second terminal plate; 51, first main body; 52, second main body; 61, first connecting portion; 62, second connecting portion; 71, first pole ear; 72, second pole ear; 81, first insulating member; 811, first covering portion; 82, second insulating member; 821, second covering portion; 91, first overlapping portion; 92, second overlapping portion; 93, connecting area; X, length direction of the first shell wall; Y, width direction of the first shell wall; Z, wall thickness direction of the first shell wall; 1111a, boss; 1111b, accommodating portion. DETAILED DESCRIPTION

[0120] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0121] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians 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" in the specification of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0122] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in the field of energy storage.

[0123] As the industry's requirements for battery volume utilization and lightweight continue to increase, the battery cell shell tends to be larger and thinner. In this case, the battery cell shell tends to be insufficiently strong and prone to bending and deformation. In addition, the electrode terminals provided in the shell sometimes aggravate this tendency. Therefore, how to improve the strength of the shell wall of the battery cell shell with the electrode terminals is one of the research directions of the industry.

[0124] According to research, by centrally arranging the poles relative to the shell wall, it helps to cooperate with each other to form a larger structural reinforcement, thereby improving the structural strength of the shell wall where the electrode terminal is located, especially the bending strength.

[0125] Based on such technical conception, the present application provides a battery cell, comprising: a shell having a accommodating space, the shell comprising a first shell wall; an electrode assembly, arranged in the accommodating space; and a first electrode terminal, arranged on the first shell wall, the first electrode terminal comprising a first connecting portion connected to a first busbar; a second electrode terminal, arranged on the first shell wall, the second electrode terminal comprising a second connecting portion connected to a second busbar; the first connecting portion and the second connecting portion are arranged along the width direction of the first shell wall, and the projections of the first connecting portion and the second connecting portion along the width direction of the first shell wall at least partially overlap.

[0126] Since the first connection portion and the second connection portion are arranged along the width direction of the first shell wall, and the projections along the width direction of the first shell wall overlap, the first electrode terminal and the second electrode terminal are arranged at relatively concentrated positions, which helps to cooperate with each other to form a structural reinforcement with a larger area, thereby improving the structural strength of the first shell wall, especially the bending strength. Since the first connection portion and the second connection portion are respectively used to connect to the busbar, after the multiple battery cells are arranged along the width direction of the first shell wall, the first connection portion and the second connection portion of the adjacent battery cells are located oppositely, which helps to shorten the connection path of the busbar.

[0127] The battery cell of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. The battery cell, battery, etc. of the present application can be used to form a power supply system of the electrical device.

[0128] The battery cells provided in the embodiments of the present application can be used, but are not limited to, in electrical devices such as energy storage devices, vehicles, ships or aircraft.

[0129] The battery cells provided in the embodiments of the present application can also be grouped together to form a battery (sometimes also referred to as a battery pack). The battery can also be used in, but not limited to, energy storage devices, vehicles, ships, aircraft and other electrical devices.

[0130] The present application also provides an electric device including the battery cell or battery, which may be, but not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0131] The embodiments of the present application also provide an energy storage device including the above-mentioned battery cell or battery, and the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0132] For the convenience of description, an electric device according to an embodiment of the present application is described below by taking a vehicle 1000 as an example.

[0133] Figure 1 The structure diagram of a vehicle 1000 provided in one embodiment of the present application is shown in FIG. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Fig.21 As shown, a battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and operating power requirements of the vehicle 1000 during driving.

[0134] In some embodiments of the present application, the battery 100 can be used not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0135] In the present application, a battery includes a plurality of battery cells. A battery cell refers to a basic unit that can realize the mutual conversion between chemical energy and electrical energy, and can be used to make a battery module or a battery pack, so as to supply power to an electrical device. A battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged. The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the present application does not limit this.

[0136] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0137] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0138] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0139] In some embodiments, the housing may 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 sealing bag is also included between the housing and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film.

[0140] As an example, the battery cell may 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 polygonal battery, such as a hexagonal battery.

[0141] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0142] In some embodiments, at least one electrode terminal (also called "electrode") is provided on the housing, and the electrode terminal is electrically connected to the pole lug. The electrode terminal can be directly connected to the pole lug, or indirectly connected to the pole lug through a transition component. The electrode terminal can be provided on the end cap or on the housing. In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to release the internal pressure of the battery cell.

[0143] In the embodiment of the present application, the battery may also be a single physical module (eg, a battery module or battery pack) including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in hybrid connection through a busbar.

[0144] In the description of this application, the technical terms "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 number, specific order or primary and secondary relationship of the indicated technical features. In the description of this application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0145] 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.

[0146] 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.

[0147] In the description of the embodiments of the present application, for the sake of convenience, the direction of arrow X is referred to as the "length direction of the first shell wall", the direction of arrow Y is referred to as the "width direction of the first shell wall", and the direction of arrow Z is referred to as the "wall thickness direction of the first shell wall".

[0148] 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.

[0149] 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.

[0150] Below, some embodiments of the present application are described in detail with reference to the accompanying drawings.

[0151] Figure 3 A schematic diagram of a battery provided in one embodiment of the present application; Figure 4 A three-dimensional diagram of a battery cell provided in one embodiment of the present application; Figure 5 A three-dimensional diagram of a battery cell provided in another embodiment of the present application; Figure 6 A three-dimensional diagram of a battery cell provided in yet another embodiment of the present application; Figure 7 A side view of a battery cell provided in one embodiment of the present application; Figure 8 for Figure 7 CC section view in; Fig. 9 A schematic diagram of forming a first recess and a second recess on a first housing wall according to an embodiment of the present application; Fig.10 An exploded view of a top cover of a battery cell provided in one embodiment of the present application; Fig.11 A top view of a first housing wall provided in an embodiment of the present application; Fig.12 for Fig.11 DD section view in; Fig.13 for Fig.12 A partial enlarged view of part E in FIG. Fig.14 A top view of a first housing wall provided in accordance with another embodiment of the present application; Fig.15 A top view of a first housing wall provided for yet another embodiment of the present application; Fig.16 A schematic diagram of forming a connection area at an electrode terminal according to an embodiment of the present application; Fig.17 A schematic diagram of forming a connection area at an electrode terminal according to another embodiment of the present application; Fig.18 A three-dimensional diagram of a busbar provided by an embodiment of the present application connecting adjacent battery cells; Fig.19A top view of a busbar provided in an embodiment of the present application connecting adjacent battery cells; Fig. 20 A three-dimensional diagram of a busbar provided by another embodiment of the present application connecting adjacent battery cells; Fig.21 A three-dimensional diagram of a busbar provided in another embodiment of the present application connecting adjacent battery cells; Fig. 22 A three-dimensional diagram of a battery cell provided in yet another embodiment of the present application; Fig.23 A schematic diagram of a battery provided with a boss according to an embodiment of the present application; Fig.24 for Fig.23 Middle FF section view; Fig.25 A schematic diagram of a battery cell provided with a first protruding portion and a first recessed portion according to an embodiment of the present application; Fig.26 for Fig.25 A local enlarged view of part G in FIG. Fig. 27 A schematic diagram of a battery cell provided with a second protrusion according to an embodiment of the present application; Fig.28 for Fig. 27 Middle HH section view; Fig.29 for Fig.28 A partial enlarged view of part J in the middle.

[0152] In a first aspect, the present application provides a battery cell, such as Figure 4 As shown, the battery cell 10 includes: a shell 1 having a accommodating space, the shell 1 including a first shell wall 11; an electrode assembly arranged in the accommodating space; and a first electrode terminal 31, arranged on the first shell wall 11, the first electrode terminal 31 including a first connecting portion 61 connected to the first bus bar; a second electrode terminal 32, arranged on the first shell wall 11, the second electrode terminal 32 including a second connecting portion 62 connected to the second bus bar; the first connecting portion 61 and the second connecting portion 62 are arranged along the width direction Y of the first shell wall of the battery cell 10, and the projections of the first connecting portion 61 and the second connecting portion 62 along the width direction Y of the first shell wall at least partially overlap.

[0153] The battery cell 10 includes: a shell 1. The shell 1 is composed of a plurality of shell walls, and the plurality of shell walls surround a storage space. Specifically, the shell 1 includes a shell and a top cover. The shell is configured as a box body 20 with an opening on one side, and the box body 20 has a storage space, and the bare battery cell is placed in the storage space. The top cover is connected to the shell and closes the opening, and the top cover is used as the first shell wall 11. Optionally, fillets or chamfers are configured at the connection between adjacent shell walls. The shell wall can be configured as a plane or a curved surface, and the present application does not impose any special limitation on the shape of the shell wall.

[0154] The battery cell 10 also includes: an electrode assembly. The electrode assembly is located in the accommodating space. The electrode assembly includes a pole piece and a separator. There are two pole pieces, namely a positive pole piece and a negative pole piece. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive pole piece and the negative pole piece, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through. The positive pole piece, the negative pole piece and the separator can be stacked and wound to form a stacked winding body. The electrode assembly is not limited to the winding type, for example, it can also be a laminated type or other structural forms.

[0155] The electrode assembly is provided with a pole ear, which can lead the current from the electrode assembly. The pole ear includes a first pole ear 71 and a second pole ear 72, which are arranged on the same side of the electrode assembly along the third direction Z and are both arranged near one end of the electrode assembly along the first direction X. Of course, the first pole ear 71 and the second pole ear 72 can also be arranged on opposite sides of the electrode assembly; the first pole ear 71 and the second pole ear 72 can also be respectively arranged near the two ends of the electrode assembly along the first direction X.

[0156] The battery cell 10 also includes: an electrode terminal, which is electrically connected to the electrode assembly so that current flows between the battery cell 10 and an external power device or a charging device. There are two electrode terminals, namely a first electrode terminal 31 and a second electrode terminal 32. The first electrode terminal 31 and the second electrode terminal 32 are both arranged on the same shell wall, that is, the first electrode terminal 31 and the second electrode terminal 32 are both arranged on the first shell wall 11. The first electrode terminal 31 passes through the first shell wall 11 and is electrically connected to the first pole ear 71 or the second pole ear 72, and the second electrode terminal 32 passes through the first shell wall 11 and is electrically connected to the first pole ear 71 or the second pole ear 72.

[0157] The width direction Y of the first housing wall of the battery cell 10 refers to the direction of the shortest side of the first housing wall 11, which may be the direction of the shortest side of the battery cell 10. If the first housing wall 11 is configured as a square, the width direction Y of the first housing wall is the direction of any side of the first housing wall 11.

[0158] The first connection portion 61 and the second connection portion 62 are arranged along the width direction Y of the first shell wall of the battery cell 10 and are spaced apart from each other by a certain distance to prevent the first electrode terminal 31 and the second electrode terminal 32 from being electrically connected. Along the width direction Y of the first shell wall, the projections of the first connection portion 61 and the second connection portion 62 at least partially overlap. The first connection portion 61 has a surface parallel to the first shell wall 11, and the second connection portion 62 has a surface parallel to the first shell wall 11, and the two surfaces are located on the same horizontal plane to share external forces.

[0159] In the battery cell 10 in the embodiment of the present application, since the first connection portion 61 and the second connection portion 62 are arranged along the width direction Y of the first shell wall of the battery cell 10, and the projections along the width direction Y of the first shell wall overlap, the first electrode terminal 31 and the second electrode terminal 32 are arranged in a relatively concentrated and compact position, which helps to cooperate with each other to form a structural reinforcement with a larger area, thereby improving the structural strength of the first shell wall. Since the first connection portion 61 and the second connection portion 62 are respectively used to connect to the busbar 2, after the multiple battery cells 10 are arranged along the width direction Y of the first shell wall, the first connection portion 61 and the second connection portion 62 of the adjacent battery cells 10 are opposite to each other, which helps to shorten the connection path of the busbar 2.

[0160] In addition, since the electrode assembly is disposed in the accommodation space, the housing 1 can protect the electrode assembly. Since the first housing wall 11 is provided with the first electrode terminal 31 and the second electrode terminal 32, the electrode assembly can communicate with the outside through the electrode terminals.

[0161] In some embodiments, Figure 5 , Fig.14 and Fig.15 As shown, the first electrode terminal 31 also includes a first main body portion 51 connected to the first connecting portion 61, and the second electrode terminal 32 also includes a second main body portion 52 connected to the second connecting portion 62. Along the length direction X of the first shell wall of the battery cell 10, at least a portion of the first connecting portion 61 and at least a portion of the second connecting portion 62 are located between the first main body portion 51 and the second main body portion 52.

[0162] The length direction X of the first housing wall of the battery cell 10 refers to the direction of the longest side of the first housing wall 11 , and is perpendicular to the width direction Y of the first housing wall of the battery cell 10 .

[0163] The first electrode terminal 31 further includes a first main body 51. The first main body 51 is disposed on one side of the first connecting portion 61 along the length direction X of the first housing wall of the battery cell 10. The first main body 51 and the first connecting portion 61 may be an integral structure or a separate structure. The first main body 51 and the first connecting portion 61 are connected to each other and are in conduction.

[0164] The second electrode terminal 32 further includes a second main body 52. ​​Along the length direction X of the first housing wall of the battery cell 10, the second main body 52 is disposed on a side of the second connecting portion 62 away from the first main body 51. The second main body 52 and the second connecting portion 62 may be an integral structure or a separate structure. The second main body 52 and the second connecting portion 62 are connected to each other and are in conduction.

[0165] The first body portion 51 and the second body portion 52 are arranged along the length direction X of the first housing wall, and the projection of the first body portion 51 in the length direction X of the first housing wall may at least partially overlap with the second body portion 52, or may be located outside the second body portion 52. The projection of the first body portion 51 in the width direction Y of the first housing wall is located outside the second body portion 52.

[0166] The first body portion 51 and the second body portion 52 can be respectively configured in a rectangular shape, a circular shape, etc., and the present application does not impose any special limitation on the specific shape of the first body portion 51. The first body portion 51 and the second body portion 52 can be configured in the same shape and / or size, or in different shapes and / or sizes.

[0167] The first connection part 61 is connected and conducted with the first main body part 51, and the second connection part 62 is connected and conducted with the second main body part 52. Along the length direction X of the first housing wall, the side of the first main body part 51 close to the second main body part 52 is connected to the first connection part 61, and the side of the second main body part 52 close to the first main body part 51 is connected to the second connection part 62, so that the first connection part 61 and the second connection part 62 are located between the first main body part 51 and the second main body part 52. A distance is separated between the first connection part 61 and the second connection part 62 to prevent the first electrode terminal 31 and the second electrode terminal 32 from being conducted. Along the width direction Y of the first housing wall, the projection of the first connection part 61 partially overlaps with the second connection part 62, and the overlapping part is the first overlapping part 91.

[0168] The first connection portion 61 and the second connection portion 62 can be respectively configured as a rectangle extending along the length direction X of the first shell wall, or as a wave shape bent along the width direction Y of the first shell wall, or as a triangle tapering in the direction away from the first main body portion 51. The present application does not impose any special restrictions on the specific shapes of the first connection portion 61 and the second connection portion 62. The second connection portion 62 can be configured in the same shape and / or size as the first connection portion 61, or in a different shape and / or size from the first connection portion 61.

[0169] Since the first connecting portion 61 is connected to the first main body 51, and the second connecting portion 62 is connected to the second main body 52, the first main body 51 and the second main body 52 further increase the force-bearing area and improve the bending strength of the first shell wall. Since the first connecting portion 61 and the second connecting portion 62 are located between the first main body 51 and the second main body 52 along the length direction X of the first shell wall, and the first connecting portion 61 and the second connecting portion 62 have an overlapping portion along the width direction Y of the first shell wall, the synergistic effect of the two electrode terminals can be used to improve the bending strength of the area where the electrode terminals are set in the first shell wall. Moreover, the first electrode terminal and the second electrode terminal can be set as compactly as possible, which is conducive to the use of the non-electrode terminal setting area of ​​the first shell wall, and further conducive to improving the volume utilization of the battery pack.

[0170] In some embodiments, Figure 6 As shown, the length of the first main body portion 51 along the width direction Y of the first shell wall is greater than or equal to the first connecting portion 61; and / or the length of the second main body portion 52 along the width direction Y of the first shell wall is greater than or equal to the second connecting portion 62.

[0171] The length of the first main body 51 along the width direction Y of the first shell wall is the maximum length of the outermost contour of the first main body 51 along the width direction Y of the first shell wall, which is represented by B1. The length of the first connecting portion 61 along the width direction Y of the first shell wall is the maximum length of the outermost contour of the first connecting portion 61 along the width direction Y of the first shell wall, which is represented by W1. Along the width direction Y of the first shell wall, the length of the first main body 51 is set to be greater than or equal to the length of the first connecting portion 61, that is, B1≥W1 and the projection of the length direction X of the first shell wall of the first connecting portion 61 is located inside the first main body 51.

[0172] The length of the second main body 52 along the width direction Y of the first shell wall is the maximum length of the outermost contour of the second main body 52 along the width direction Y of the first shell wall, which is represented by B2. The length of the second connecting portion 62 along the width direction Y of the first shell wall is the maximum length of the outermost contour of the second connecting portion 62 along the width direction Y of the first shell wall, which is represented by W2. Along the width direction Y of the first shell wall, the length of the second main body 52 is greater than or equal to the length of the second connecting portion 62, that is, B2 ≥ W2, and the projection of the length direction X of the first shell wall of the second connecting portion 62 is located inside the second main body 52.

[0173] In one embodiment, the projection of the first shell wall of the first main body portion 51 in the length direction X at least partially overlaps with the second main body portion 52. In order to avoid contact between the first connection portion 61 and the second connection portion 62, the length of the first shell wall of the first connection portion 61 in the width direction Y is smaller than that of the first main body portion 51 (W1<B1), and the length of the first shell wall of the second connection portion 62 in the width direction Y is smaller than that of the second main body portion 52 (W2<B2), so that the edge of the first connection portion 61 close to the second connection portion 62 is separated from the edge of the second connection portion 62 close to the first connection portion 61.

[0174] In another embodiment, the projection of the length direction X of the first shell wall of the first main body portion 51 is located outside the second main body portion 52. Optionally, the length of the width direction Y of the first shell wall of the first connecting portion 61 is equal to the length of the first main body portion 51 (W1=B1), and the length of the width direction Y of the first shell wall of the second connecting portion 62 is equal to the length of the second main body portion 52 (W2=B2). Also optionally, the length of the width direction Y of the first shell wall of the first connecting portion 61 is equal to the length of the first main body portion 51 (W1=B1), and the length of the width direction Y of the first shell wall of the second connecting portion 62 is less than the length of the second main body portion 52 (W2<B2). Also optionally, the length of the width direction Y of the first shell wall of the second connecting portion 62 is equal to the length of the second main body portion 52 (W2=B2), and the length of the width direction Y of the first shell wall of the first connecting portion 61 is less than the length of the first main body portion 51 (W1<B1).

[0175] Since the length of the first shell wall of the first main body 51 in the width direction Y is greater than or equal to the first connecting portion 61, at least one side of the first shell wall of the first connecting portion 61 in the width direction Y has space, which helps to stagger the first connecting portion 61 and the second connecting portion 62 and other protruding structures, thereby improving the flexibility of arranging the first electrode terminal 31 and helping to improve the space utilization rate on the first shell wall 11. Since the length of the first shell wall of the second main body 52 in the width direction Y is greater than or equal to the second connecting portion 62, at least one side of the first shell wall of the second connecting portion 62 in the width direction Y has space, which helps to stagger the second connecting portion 62 and the first connecting portion 61 and other protruding structures, thereby improving the flexibility of arranging the second electrode terminal 32 and helping to improve the space utilization rate on the first shell wall 11. Moreover, setting the first main body and the second main body to be larger is conducive to installing the connecting column on the first main body and the second main body, and is conducive to improving the installation stability of the electrode terminal relative to the first shell wall. Setting the width of the first connecting portion and the second connecting portion along the second direction to be smaller is conducive to reducing the weight of the electrode terminal and even the battery cell and the battery pack. Furthermore, the first connection portion and the second connection portion can be used to form a flow bottleneck portion, thereby eliminating the need for a separate process for processing the flow bottleneck portion.

[0176] In some embodiments, Fig.14 As shown, along the width direction Y of the first shell wall, the first connection portion 61 is offset relative to the center position of the first main body portion 51; and / or, along the width direction Y of the first shell wall, the second connection portion 62 is offset relative to the center position of the second main body portion 52.

[0177] When the projection of the length direction X of the first shell wall of the first main body 51 is located outside the second main body 52, the first connecting portion 61 can be set at any position on the side of the first main body 51 close to the second main body 52, and the second connecting portion 62 can be set at any position on the side of the second main body 52 close to the first main body 51. For example, the first connecting portion 61 is set at the center position or offset center position of the first main body 51, and / or the second connecting portion 62 is set at the center position or offset center position of the second main body 52.

[0178] When the projection of the length direction X of the first shell wall of the first main body 51 overlaps with the second main body 52, the first connecting portion 61 and the second connecting portion 62 need to be arranged to avoid each other. Optionally, the first connecting portion 61 and the second connecting portion 62 are respectively configured to be shapes extending along the length direction X of the first shell wall, such as a rectangular shape, a curved shape, etc. The first connecting portion 61 is arranged to be offset relative to the center position of the first main body 51, so that a space is reserved on one side of the width direction Y of the first shell wall of the first connecting portion 61, and the second connecting portion 62 occupies part of the space and is arranged on the second main body 52, and the second connecting portion 62 can be arranged to be offset relative to the center position of the second main body 52.

[0179] Alternatively, if Fig.15 As shown, the first connection portion 61 and the second connection portion 62 are respectively configured to be a shape that tapers along the length direction X of the first shell wall, such as a trapezoid, a triangle, etc. The length of the first connection portion 61 in the width direction Y of the first shell wall is set to be smaller as it is closer to the second main body portion 52, and the length of the second connection portion 62 in the width direction Y of the first shell wall is set to be smaller as it is closer to the first main body portion 51. The first connection portion 61 and the second connection portion 62 are set to be spaced apart from each other, and the first connection portion 61 can be set at any position on the side of the first main body portion 51 close to the second main body portion 52, and the second connection portion 62 can be set at any position on the side of the second main body portion 52 close to the first main body portion 51.

[0180] Since the first connection part 61 is offset relative to the center position of the first main body part 51 and the second connection part 62 is offset relative to the center position of the second main body part 52 along the width direction Y of the first shell wall, the first connection part 61 and the second connection part 62 are staggered with each other, which can not only make full use of the space, but also make the first electrode terminal 31 and the second electrode terminal 32 arranged more concentratedly, thereby improving the strength of the area where the electrode terminals are located, which is beneficial to reducing the risk of bending and deformation in the area where the electrode terminals are located.

[0181] In some embodiments, the projections of the first body portion 51 and the second connection portion 62 along the length direction of the first shell wall overlap, and / or the projections of the second body portion 52 and the first connection portion 61 along the length direction X of the first shell wall overlap.

[0182] The first main body 51 and the second main body 52 are arranged relatively compactly along the length direction X of the first shell wall, that is, the distance between the first main body 51 and the second connecting portion 62 is relatively close, and the distance between the second main body 52 and the first connecting portion 61 is relatively close.

[0183] Thus, by arranging the first main body 51 and the second connecting portion 62 to overlap in the length direction of the first shell wall, and / or the second main body 52 and the first connecting portion 61 to overlap in the length direction of the first shell wall, the synergistic effect of the two electrode terminals can be used to improve the bending strength of the area where the electrode terminals are set in the first shell wall. In addition, 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 setting area of ​​the first shell wall, and further beneficial to improving the volume utilization rate of the battery pack.

[0184] In some embodiments, a gap is formed between the first connection portion 61 and the first main body portion 51 , and the second connection portion 62 is at least partially located in the gap.

[0185] Optionally, the first connection portion 61 is offset relative to the center position of the first main body portion 51, so that a space is reserved on one side of the first shell wall of the first connection portion 61 in the width direction Y, and the space is regarded as a gap between the first connection portion 61 and the first main body portion 51, and the second connection portion 62 occupies part of the gap and is arranged on the second main body portion 52. The first connection portion 61 can be configured into any shape, and a space is reserved on one side of the first shell wall of the first connection portion 61 in the width direction Y.

[0186] Also, optionally, the second connecting portion 62 is offset relative to the center position of the second main body portion 52 so that space is left on one side of the first shell wall of the second connecting portion 62 in the width direction Y. The space is regarded as a gap between the second connecting portion 62 and the second main body portion 52, and the first connecting portion 61 occupies a part of the gap and is arranged on the first main body portion 51.

[0187] Thus, the second connecting portion 62 is filled in the gap between the first connecting portion 61 and the first main body portion 51, so that the second electrode terminal and the first electrode terminal are close to each other. On the one hand, the strength of the area where the electrode terminal is located is improved, which is beneficial to reduce the risk of bending and deformation in the area where the electrode terminal is located; on the other hand, it is beneficial to utilize the non-electrode terminal setting area of ​​the first shell wall, which is beneficial to improve the volume utilization of the battery pack.

[0188] In some embodiments, Fig. 22 As shown, the length of the first shell wall 11 along the length direction X of the first shell wall is L, the length of the first connecting portion 61 along the length direction X of the first shell wall is A1, and the length of the second connecting portion 62 along the length direction X of the first shell wall is A2, then 10%≤A1 / L≤40%, and / or 10%≤A2 / L≤40%.

[0189] L represents the length of the outermost contour of the first housing wall 11 along the length direction X of the first housing wall.

[0190] A1 represents the length of the outermost contour of the first connecting portion 61 along the length direction X of the first housing wall.

[0191] A2 represents the length of the outermost contour of the second connecting portion 62 along the length direction X of the first housing wall.

[0192] The ratio of A1 to L ranges from 10% to 40%, and the ratio of A2 to L ranges from 10% to 40%.

[0193] By setting A1 and / or A2 to be no less than 10% of L, the first overlapping portion 91 can provide sufficient structural strength; by setting A1 and / or A2 to be no greater than 40% of L, the material consumption of the first overlapping portion 91 is controlled within a reasonable range.

[0194] In some embodiments, Figures 4 to 6 As shown, along the width direction Y of the first shell wall, the first connection portion 61 and the second connection portion 62 have a first overlapping portion, and the length of the first overlapping portion 91 along the length direction X of the first shell wall is in the range of 3 mm to 50 mm.

[0195] A represents the length of the outermost contour edge of the first overlapping portion along the length direction X of the first housing wall.

[0196] In other words, 3mm≤A≤50mm. Optionally, the length of the first overlapping portion 91 along the length direction X of the first shell wall can be 3mm, 5mm, 10mm, 20mm, 30mm, 40mm, or 50mm.

[0197] Therefore, the first overlapping portion 91 can take into account both strength requirements and material saving.

[0198] In some embodiments, Fig.15 As shown, along the width direction Y of the first shell wall, the first main body portion 51 and the second main body portion 52 are located between the first connecting portion 61 and the second connecting portion 62 .

[0199] The first main body portion 51 and the second main body portion 52 are arranged along the length direction X of the first housing wall and are spaced apart from each other. The first main body portion 51 and the second main body portion 52 are located between the first connecting portion 61 and the second connecting portion 62 .

[0200] Along the width direction Y of the first shell wall, the outer edges of the second main body 52 and the first connecting portion 61 (the edges close to the long sides of the first shell wall 11) are generally flush, and the outer edges of the first main body 51 and the second connecting portion 62 (the edges close to the long sides of the first shell wall 11) are generally flush. However, they may not be flush. Optionally, one of the outer edges of the second main body 52 and the outer edges of the first connecting portion 61 is closer to the long sides of the first shell wall 11, and / or one of the outer edges of the first main body 51 and the outer edges of the second connecting portion 62 is closer to the long sides of the first shell wall 11.

[0201] In one embodiment, the first body portion 51 and the second body portion 52 are set to have the same length along the width direction Y of the first housing wall, and the projection of the first body portion 51 in the length direction X of the first housing wall completely overlaps with the second body portion 52. Along the width direction Y of the first housing wall, the length of the second overlapping portion 92 is the same as the length of the first body portion 51 and the length of the second body portion 52.

[0202] In another embodiment, the lengths of the first main body 51 and the second main body 52 along the width direction Y of the first housing wall are different. Optionally, along the length direction X of the first housing wall, the projection of the first main body 51 is located inside the second main body 52; along the width direction Y of the first housing wall, the length of the second overlapping portion 92 is the same as the length of the first main body 51. Also optionally, along the length direction X of the first housing wall, the projection of the second main body 52 is located inside the first main body 51; along the width direction Y of the first housing wall, the length of the second overlapping portion 92 is the same as the length of the second main body 52.

[0203] Thus, since there are overlapping parts in both the first direction and the second direction, the first electrode terminal and the second electrode terminal can be compactly arranged in both the first direction and the second direction, and the bending strength of the first shell wall can be further improved. The first main body 51 and the second main body 52 are distributed more concentratedly, which helps to share the external force together, thereby improving the structural strength and reducing the risk of excessive deformation.

[0204] In some embodiments, see Fig.15 The length of the first shell wall 11 along the width direction Y of the first shell wall is W, and the length of the second overlapping part 92 along the width direction Y of the first shell wall is B, then B is in the range of 20% to 90% of W.

[0205] W represents the length of the outermost contour of the first housing wall 11 along the width direction Y of the first housing wall.

[0206] B represents the length of the outermost contour of the second overlapping portion 92 along the width direction Y of the first housing wall.

[0207] Along the length direction X of the first housing wall, a projection of the first body portion 51 along the length direction X of the first housing wall overlaps with the second body portion 52 , and the overlap is a second overlapping portion 92 .

[0208] The ratio of B to W ranges from 20% to 90%. After the battery cells 10 are arranged, a certain distance must be maintained between the electrode terminals on adjacent battery cells 10. Therefore, both the first electrode terminal 31 and the second electrode terminal 32 must be at a certain distance from the contour of the first shell wall 11. Optionally, the length of the first main body 51 along the width direction Y of the first shell wall is not greater than 90% of W, and the length of the second main body 52 along the width direction Y of the first shell wall is not greater than 90% of W. Furthermore, the length of the first connecting portion 61 along the width direction Y of the first shell wall is not greater than 90% of W, and the length of the second connecting portion 62 along the width direction Y of the first shell wall is not greater than 90% of W.

[0209] In this way, the second overlapping portion 92 can provide sufficient structural strength and space can be left on both sides of the width direction Y of the first shell wall of the second overlapping portion 92, which helps to avoid contact and conduction between the main bodies of adjacent battery cells 10 when multiple battery cells 10 are arranged along the width direction Y of the first shell wall.

[0210] In some embodiments, Figure 6 As shown, the length of the first main body 51 along the width direction Y of the first shell wall is B1, and the length of the second main body 52 along the width direction Y of the first shell wall is B2. The absolute value of the difference between B1 and B2 is greater than or equal to 0 mm.

[0211] B1 represents the length of the outermost contour of the first body portion 51 along the width direction Y of the first housing wall.

[0212] B2 represents the length of the outermost contour of the second body portion 52 along the width direction Y of the first housing wall.

[0213] The sizes of the first electrode terminal 31 and the second electrode terminal 32 may be configured to be the same or different.

[0214] When the first electrode terminal 31 and the second electrode terminal 32 are configured to have different sizes, the absolute value of the difference between B1 and B2 is greater than 0 mm, that is, |B1-B2|>0 mm; and / or the absolute value of the difference between the length of the first main body 51 along the length direction X of the first shell wall and the length of the second main body 52 along the length direction X of the first shell wall is greater than 0 mm.

[0215] When the first electrode terminal 31 and the second electrode terminal 32 are configured to have the same size, the absolute value of the difference between B1 and B2 is equal to 0 mm, that is, |B1-B2|=0 mm; and the absolute value of the difference between the length of the first main body 51 along the length direction X of the first shell wall and the length of the second main body 52 along the length direction X of the first shell wall is equal to 0 mm.

[0216] Thus, the lengths of the first housing wall of the first body portion 51 and the first housing wall of the second body portion 52 in the width direction Y may be different.

[0217] In some embodiments, see Figure 6 , the absolute value of the difference between B1 and B2 is in the range of 0 mm to 50 mm.

[0218] Optionally, the absolute value of the difference between B1 and B2 can be 0 mm, 3 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, or 50 mm.

[0219] Thus, a reasonable size difference range is provided.

[0220] In some embodiments, along the length direction X of the first housing wall and the width direction Y of the first housing wall, the closest distance between the first pole and the second pole is greater than or equal to 0.3 mm.

[0221] Thus, a safe distance is created between the first electrode terminal 31 and the second electrode terminal 32 , which helps to reduce the risk of accidental connection between the first electrode terminal 31 and the second electrode terminal 32 .

[0222] In some embodiments, along the length direction X of the first shell wall and the width direction Y of the first shell wall, the closest distance between the first pole and the second pole is greater than or equal to 2.0 mm.

[0223] Thus, a safe distance is created between the first electrode terminal 31 and the second electrode terminal 32 , and even without using an insulating member to isolate the two electrode terminals, the risk of accidental connection between the first electrode terminal 31 and the second electrode terminal 32 can be reduced.

[0224] In some embodiments, Figures 11 to 13 As shown, the first terminal plate 41 is provided with a first protrusion 314, and the second terminal plate 42 is provided with a first recess 315. The first protrusion 314 and the first recess 315 at least partially overlap along the wall thickness direction of the first shell wall, and the first protrusion 314 and the first recess 315 cooperate with each other.

[0225] The first protrusion 314 refers to a portion of the structure extending from the first electrode terminal 31 and entering 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 and capable of accommodating the first protrusion 314. The recess may be formed by a groove or by a step. In the case where the recess is formed by a step, it may include a single step, or may include two or more steps.

[0226] Here, the first protrusion 314 and the first recessed portion 315 in the mutually matched state can at least mutually restrict displacement along the wall thickness direction Z of the first shell wall. Optionally, the first protrusion 314 and the first recessed portion 315 in the mutually matched state can also restrict displacement along the length direction X of the first shell wall and / or the width direction Y of the first shell wall.

[0227] Therefore, through the cooperation between the first protrusion 314 and the first recessed portion 315, it is convenient to realize the support and fixation of the first electrode terminal 31 to the second electrode terminal 32, improve the bending strength of the second electrode terminal 32, and facilitate processing; by arranging the first protrusion 314 in the first recessed portion 315, the space occupied by the first protrusion is reduced, and the space utilization rate is improved.

[0228] In some embodiments, Fig.13 , Fig.25 and Fig.26 As shown, the battery cell further includes a first insulating member 81 , which is at least partially disposed between the first terminal plate and the first housing wall 11 .

[0229] The battery cell 10 also includes a first insulating member 81. The extension direction of the first insulating member 81 is parallel to the first shell wall 11. The first insulating member 81 is at least provided between the first electrode terminal 31 and the first shell wall 11, and is used to separate the first electrode terminal 31 from the first shell wall 11. Optionally, the first insulating member 81 is constructed in a frame shape, and the extension direction of a portion of the first insulating member 81 is perpendicular to the first shell wall 11, and the portion surrounds the surface of the first electrode terminal 31 perpendicular to the first shell wall 11. Further, the first insulating member 81 extends from the edge of the first electrode terminal 31 to the center of the first electrode terminal 31, covers the portion of the surface of the first electrode terminal 31 away from the first shell wall 11, and limits the first electrode terminal 31 within the first insulating member 81.

[0230] In one embodiment, the first insulating member 81 is disposed between the first electrode terminal 31 and the first housing wall 11, and between the first electrode terminal 31 and the second electrode terminal 32. The first insulating member 81 located between the first electrode terminal 31 and the second electrode terminal 32 is bent and extended toward the second electrode terminal 32, covering a portion of the surface of the second electrode terminal 32 away from the first housing wall 11, so that the second electrode terminal 32 is partially located between the first insulating member 81 and the first housing wall 11. Further, the first insulating member 81 located between the first electrode terminal 31 and the second electrode terminal 32 is also bent and extended toward the first electrode terminal 31, covering a portion of the surface of the first electrode terminal 31 away from the first housing wall 11, so that the first electrode terminal 31 is partially located between the first insulating member 81 and the first housing wall 11.

[0231] The first protrusion 314 includes a structure protruding from a part of the first electrode terminal 31, and also includes a structure protruding from a part of the first insulating member 81. When a part 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 part of the first insulating member 81 (e.g., the first covering portion 811) corresponds to the first protrusion 314. When the first electrode terminal 31 and the first insulating member 81 abut against the second electrode terminal 32 to limit bending deformation, the first protrusion 314 includes a part protruding from the second electrode terminal 32 and a part protruding from the first insulating member 81.

[0232] This makes it possible to insulate the second electrode terminal from the outer casing of the battery cell.

[0233] In some embodiments, see Fig.13 The first recessed portion 315 includes a first step portion 3151 and a second step portion 3152, and the second step portion 3152 is arranged on a side of the first step portion 3151 away from the first electrode terminal assembly 30; the first protruding portion includes an extension portion provided on the first electrode terminal 31, and along the wall thickness direction of the first shell wall, a part of the second electrode terminal 32 is located between the extension portion and the first shell wall 11, and the extension portion is at least partially accommodated in the step space formed by the first step portion 3151; the first protruding portion 314 also includes a first covering portion 811 provided on the first insulating member 81, and along the wall thickness direction of the first shell wall 11, a part of the second electrode terminal 32 is located between the first covering portion 811 and the first shell wall 11, and the first covering portion 811 is at least partially accommodated in the step space formed by the second step portion 3152.

[0234] The first step portion 3151 is formed by a portion of the second terminal plate 42 that becomes lower toward the side away from the first housing wall 11 along the wall thickness direction of the first housing wall 11. Fig.13The portion of the second terminal plate 42 in the left dashed box. The extension portion is accommodated in the first step portion 3151, and the first insulating member 81 is interposed between the extension portion and the first step portion 3151.

[0235] Here, the first protruding portion 314 includes a protruding portion and a first covering portion 811 ; and the first recessed portion 315 includes a first step portion 3151 and a second step portion 3152 .

[0236] The first step portion 3151 is formed on a side surface of the second electrode terminal 32 away from the first housing wall 11 along the wall thickness direction of the first housing wall 11 . The extension portion is accommodated in the first step portion 3151 , and the first insulating member 81 is interposed between the extension portion and the first step portion 3151 .

[0237] The first insulating member 81 also has a portion of the surface of the protruding portion that contacts the recessed portion, so that when the protruding portion is inserted into the first step portion 3151, the first insulating member 81 is clamped between the protruding portion and the first step portion 3151, thereby maintaining the insulation state.

[0238] At the second electrode terminal 32, a second step portion 3152 is further formed at a position farther away from the protruding portion than the first step portion 3151, and the first insulating member 81 has a first covering portion 811, which covers the second step portion 3152 from the side away from the first shell wall 11 along the wall thickness direction of the first shell wall 11.

[0239] The second step portion 3152 may be a portion that becomes lower along the wall thickness direction Z of the first housing wall relative to the surface of the second electrode terminal 32 that is farthest from the first housing wall 11; the first covering portion 811 may be a portion 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 completely sunken into the second step portion 3152.

[0240] The length of the second step portion 3152 and the first covering portion 811 along the length direction X of the first shell wall can be determined according to the creepage distance to be provided. It is generally believed that the longer the length of the second step portion 3152 and the first covering portion 811 along the length direction X of the first shell wall, the greater the creepage distance and the higher the insulation reliability.

[0241] Thus, the bending deformation of the second electrode terminal 32 can be limited by the cooperation between the extension and the first step portion 3151, and the extension is at least partially accommodated in the first step portion 3151, so as to reduce the space occupied by the extension and improve the space utilization. By providing the first covering portion 811, the creepage distance on the surface of the first electrode terminal 31 and the second electrode terminal 32 can be increased, and the insulation reliability can be improved. Moreover, by accommodating the first covering portion 811 in the second step portion 3152, the covering portion does not occupy additional space, thereby improving the space utilization.

[0242] In some embodiments, the battery cell further includes a second insulating member 82 , which is at least partially disposed between the first terminal plate and the first housing wall 11 .

[0243] An insulating member may or may not be provided between the second electrode terminal 32 and the first housing wall 11 .

[0244] Optionally, the second electrode terminal 32 is connected to the negative electrode ear, and no insulating member is provided between the second electrode terminal 32 and the first shell wall 11 , so that the first shell wall 11 and even the entire shell 1 are negatively charged.

[0245] Optionally, the second electrode terminal 32 is connected to the positive electrode tab or the negative electrode tab, and a second insulating member 82 is provided between the second electrode terminal 32 and the first shell wall 11 , so that the first shell wall 11 and even the entire shell 1 are insulated from the second electrode terminal 32 and are not charged.

[0246] This allows the first electrode terminal to be insulated from the outer casing of the battery cell, and therefore is applicable not only to designs in which the outer casing is charged but also to designs in which the outer casing is not charged.

[0247] In some embodiments, Figure 7 , Figure 8 , Figures 10 to 13 As shown, the battery cell 10 further includes a first insulating member 81 , which is at least partially disposed between the first electrode terminal 31 and the first housing wall 11 , and the second electrode terminal 32 is at least partially disposed between the first insulating member 81 and the first housing wall 11 .

[0248] In some embodiments, see Figure 7 , Figure 8 , Figures 10 to 13 The battery cell 10 further includes a second insulating member 82 , which is at least partially disposed between the second electrode terminal 32 and the first housing wall 11 .

[0249] The battery cell 10 also includes a second insulating member 82. The extension direction of the second insulating member 82 is parallel to the first shell wall 11. The second insulating member 82 is at least provided between the second electrode terminal 32 and the first shell wall 11, and is used to separate the second electrode terminal 32 from the first shell wall 11. Optionally, the second insulating member 82 is constructed in a frame-shaped manner, and the extension direction of a portion of the second insulating member 82 is perpendicular to the first shell wall 11, and the portion surrounds the surface of the second electrode terminal 32 perpendicular to the first shell wall 11. Further, the second insulating member 82 extends from the edge of the second electrode terminal 32 to the center of the second electrode terminal 32, covers the portion of the surface of the second electrode terminal 32 away from the first shell wall 11, and limits the second electrode terminal 32 within the second insulating member 82.

[0250] Thus, the second electrode terminal 32 is insulated from the first housing wall 11 , thereby preventing the second electrode terminal 32 from directly contacting the housing 1 and causing the housing 1 to be charged.

[0251] In some embodiments, Fig. 9 and Fig.10 As shown, a first recess and a second recess are formed in the first shell wall 11, at least a portion of the first insulating member 81 is sunken into the first recess, and at least a portion of the second insulating member 82 is sunken into the second recess. The first recess and the second recess are independent recesses from each other, or the first recess and the second recess are connected to form one recess.

[0252] A first recess and a second recess that are recessed toward the accommodation space are formed on the first housing wall 11. At least a portion of the first insulating member 81 is sunken into the first recess, and the first recess limits the first insulating member 81 from all sides. At least a portion of the second insulating member 82 is sunken into the second recess, and the second recess limits the second insulating member 82 from all sides.

[0253] The first recess and the second recess may have the same or different recess depths. The first recess and the second recess may be independent recesses or connected to form a complete recess. There may be multiple recesses. Optionally, recesses are provided on both sides of the first insulating member 81 and / or the second insulating member 82 along the length direction X of the first shell wall of the battery cell 10.

[0254] In an optional embodiment, a protrusion is formed on the first shell wall 11 away from the accommodating space, the protrusion is surrounded by a frame, the first insulating member 81 and / or the second insulating member 82 is placed in the frame-shaped protrusion, and the frame-shaped protrusion limits the first insulating member 81 and / or the second insulating member 82.

[0255] Since the first recess is formed on the first housing wall 11, at least a portion of the first insulating member 81 is sunken into the first recess, and thus the first recess can limit the first insulating member 81, which helps to maintain a stable insulation effect between the first electrode terminal 31 and the housing 1. Since the second recess is formed on the first housing wall 11, at least a portion of the second insulating member 82 is sunken into the second recess, and thus the second recess can limit the second insulating member 82, which helps to maintain a stable insulation effect between the second electrode terminal 32 and the housing 1.

[0256] In some embodiments, Figures 16 to 21 As shown, the first electrode terminal 31 and the second electrode terminal 32 each include a connection area 93 for connecting to the bus bar 2 , and the bus bar 2 is used to electrically connect the plurality of battery cells 10 to each other.

[0257] The connection area 93 refers to an area where the busbar 2 is welded to the first electrode terminal 31 and the second electrode terminal 32 .

[0258] The busbar 2 is welded to the connection area 93 of the first electrode terminal 31 of one battery cell 10 and the connection area 93 of the second electrode terminal 32 of another battery cell 10 , respectively, to achieve electrical connection between adjacent battery cells 10 .

[0259] The connection area 93 may be in any shape such as a rectangle, a square, a trapezoid, etc., and the present application does not impose any special limitation on the shape of the connection area 93. The connection area 93 may be disposed at any position on the surface of the first electrode terminal 31 away from the first housing wall 11, and the connection area 93 may be disposed at any position on the surface of the second electrode terminal 32 away from the first housing wall 11.

[0260] Thus, the busbar 2 electrically connects adjacent battery cells 10 via the connection region 93 .

[0261] In some embodiments, Fig.16 and Fig.17 As shown, along the width direction Y of the first shell wall, the first connecting portion 61 and the second connecting portion 62 have a first overlapping portion 91 , and the connecting area 93 is at least formed in the first overlapping portion 91 .

[0262] When a plurality of battery cells 10 are arranged along the width direction Y of the first housing wall, the first connection portion 61 and the second connection portion 62 are alternately arranged along the width direction Y of the first housing wall, and the first overlapping portions 91 on each battery cell 10 overlap along the width direction Y of the first housing wall, that is, the connection line of each first overlapping portion 91 is parallel to the width direction Y of the first housing wall. The connection area 93 is formed on the first overlapping portion 91, and the busbar 2 connects the connection areas 93 on two adjacent battery cells 10 in a straight line, and the connection line of each busbar 2 is parallel to the width direction Y of the first housing wall.

[0263] Therefore, the busbar 2 at least connects the connection parts of adjacent battery cells 10. After the battery cells 10 are arranged, the first overlapping parts 91 extend in the same direction. When the busbar 2 is connected to the connection area 93 located in the first overlapping part 91, the connection path can be shortened, which helps to save materials for the busbar 2.

[0264] In some embodiments, continuing to participate Fig.16 and Fig.17 The connection area 93 is also formed in at least one of the first main body portion 51 and the second main body portion 52 .

[0265] The larger the area of ​​the connection region 93 is, the larger the flow area between the current bus 2 and the electrode terminal is, and the stronger the flow capacity is. The connection region 93 may be formed in the first body portion 51 and / or the second body portion 52 .

[0266] Since the connection area 93 is also formed in the first main body 51, the first electrode terminal 31 has a larger connection area 93, which helps to improve the connection strength between the busbar 2 and the first electrode terminal 31 and increase the flow area. Since the connection area 93 is also formed in the second main body 52, the second electrode terminal 32 has a larger connection area 93, which helps to improve the connection strength between the busbar 2 and the second electrode terminal 32 and increase the flow area.

[0267] In some embodiments, Fig.17 As shown, the area of ​​the connection area 93 formed in the first overlapping portion 91 is SA, and the area of ​​the entire connection area 93 is S, then SA accounts for 50% to 100% of S.

[0268] SA represents the area of ​​the connection region 93 formed in the first overlapping portion 91 .

[0269] S represents the area of ​​the entire connection region 93 .

[0270] The ratio of SA to S ranges from 50% to 100%, that is, 50%≤SA / S≤100%.

[0271] If the connection area 93 is only provided in the first overlapping portion 91, the ratio of SA to S is 100%.

[0272] Therefore, the connection area 93 can be set in the non-connection area in addition to being set in the connection part. The setting flexibility of the connection area 93 is strong, which helps to increase the area of ​​the connection area 93, improve the connection strength, and increase the flow area.

[0273] In some embodiments, Fig.14As shown, the center line position of the connection area 93 formed in the first connection portion 61 in the width direction Y of the first shell wall is offset by a distance B3 relative to the center line position of the first shell wall 11 in the width direction Y of the first shell wall, and B3 is in the range of 15% to 27% of W.

[0274] B3 represents an offset distance of the center line position of the connection area 93 formed in the first connection portion 61 in the width direction Y of the first shell wall relative to the center line position of the first shell wall 11 in the width direction Y of the first shell wall.

[0275] The ratio of B3 to W ranges from 15% to 27%, that is, 15%≤B3 / W≤27%.

[0276] By setting B3 to be not less than 15% of W, the first connection portion 61 can have a sufficient distance from the center, thereby facilitating a sufficient safety distance between the first connection portion 61 and the second connection portion 62; by setting B3 to be not greater than 27% of W, the first connection portion 61 can have a certain distance from the edge of the first shell wall 11.

[0277] In some embodiments, Figure 7 , Figure 8 and Fig.10 As shown, the first electrode terminal assembly 30 includes a first electrode terminal 31 and 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 shell wall 11 , and the first insulating member 81 abuts against the second electrode terminal 32 .

[0278] The first electrode terminal assembly includes a first electrode terminal 31 and a first insulating member 81 fixed to each other, and the fixing method may be integral injection molding, bonding, fastening the two together through a connecting column, etc.

[0279] In some specific embodiments, 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 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 close to the first shell wall 11.

[0280] In some specific embodiments, 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 against the side of the first insulating member 81 that is away from the first housing wall 11. The side of the first insulating member 81 that faces the first housing wall 11 abuts against the side of the second electrode terminal 32 that is away from the first housing wall 11, that is, the bending deformation of the second electrode terminal 32 is limited by a portion of the first insulating member 81. Here, the first insulating member 81 has a suitable bending strength.

[0281] 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 .

[0282] 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.

[0283] In some embodiments, 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.

[0284] 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 .

[0285] In some embodiments, the first insulating member 81 is partially disposed between the first electrode terminal 31 and the first housing wall 11. Optionally, the first electrode terminal 31 and the second electrode terminal 32 are respectively connected to the positive electrode ear and the negative electrode ear with opposite polarities, and the second electrode terminal 32 is at least partially disposed between the first insulating member 81 and the first housing wall 11. Further optionally, the first insulating member 81 is disposed between the entire first electrode terminal 31 and the first housing wall 11, and a portion of the first insulating member 81 is disposed between the first electrode terminal 31 and the first housing wall 11.

[0286] Optionally, the first electrode terminal 31 and the second electrode terminal 32 are connected to the same electrode lug of the positive electrode lug and the negative electrode lug and have the same polarity, and no insulating member may be provided between the first electrode terminal 31 and the second electrode terminal 32. Optionally, the second electrode terminal 32 is at least partially provided 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, and between the first electrode terminal 31 and the first housing wall 11.

[0287] Thus, the first electrode terminal 31 can be insulated from the battery cell housing 1, 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 improve the design freedom of the electrode terminal on the battery cell housing. Moreover, when the first insulating member 81 has a suitable strength, the bending deformation of the second electrode terminal 32 can be limited by the first insulating member 81.

[0288] In some embodiments, Fig.12 and Fig.13 As shown, along the wall thickness direction of the first shell wall 11 , the first electrode terminal 31 , the first insulating member 81 and the second electrode terminal 32 partially overlap, and the portion of the first electrode terminal 31 that overlaps with the first insulating member 81 and the second electrode terminal 32 abuts against the first insulating member 81 .

[0289] 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 .

[0290] Thus, the bending deformation of the second electrode terminal 32 can be limited by the first electrode terminal 31 and the first insulating member 81, and the first electrode terminal 31 and the second electrode terminal 32 are insulated from each other, so that the ability of the first electrode terminal assembly 30 to support and fix the second electrode terminal 32 can be further increased, and the ability of each electrode terminal to resist bending deformation can be improved; it can also strengthen the strength of the area where the electrode terminal is set in the first shell wall 11; in addition, the polarity setting of the electrode terminal has a high degree of freedom.

[0291] In some embodiments, the first electrode terminal assembly 30 includes a first electrode terminal 31, the first electrode terminal 31 includes a first terminal plate 41, at least a portion of the first terminal plate 41 is disposed on a side of the first shell wall 11 away from the accommodating space, the second electrode terminal 32 includes a second terminal plate 42, the second terminal plate 42 is disposed on a side of the first shell wall 11 away from the accommodating space, along the wall thickness direction Z of the first shell wall, the first terminal plate 41 partially overlaps with the second terminal plate 42, and the first terminal plate 41 directly or indirectly abuts against the second terminal plate 42.

[0292] Thus, a structure for supporting and fixing the first terminal board 41 to the second terminal board 42 can be formed on the side of the first housing wall 11 away from the accommodation space, which can limit the bending deformation of the second terminal board 42 in the direction away from the first housing wall 11; or, a structure for supporting and fixing the second terminal board 42 to the first terminal board 41 can be formed on the side of the first housing wall 11 away from the accommodation space, which can limit the bending deformation of the first terminal board 41 in the direction away from the first housing wall. Accordingly, the bending resistance of this area in the first housing wall 11 is improved.

[0293] In some embodiments, Fig.10 , Fig.13 and Fig.29As shown, the first electrode terminal 31 further includes a first terminal plate 311, which is disposed on the side of the first housing wall 11 facing the accommodation space, and the second electrode terminal 32 further includes a second terminal plate 321, which is disposed on the side of the first housing wall 11 facing the accommodation space. Along the wall thickness direction of the first housing wall 11, the first terminal plate 311 is at least partially disposed between the second terminal plate 321 and the first housing wall 11; or, as shown Fig.11 As shown, along the wall thickness direction of the first housing wall 11 , the second terminal plate 321 is at least partially disposed between the first terminal plate 311 and the first housing wall 11 .

[0294] In some embodiments, the first electrode terminal 31 includes a first terminal plate 41 and a first terminal disc 311 electrically connected to each other, wherein the first terminal plate 41 is located on a side of the first shell wall 11 away from the accommodating space, and the first terminal disc 311 is located on a side of the first shell wall 11 facing the accommodating space, and the second electrode terminal 32 includes a second terminal plate 42 and a second terminal disc 321 electrically connected to each other, wherein the second terminal plate 42 is located on a side of the first shell wall 11 away from the accommodating space, and the second terminal disc 321 is located on a side of the first shell wall 11 facing the accommodating space, and along the wall thickness direction of the first shell wall 11, the first terminal plate 41 is at least partially arranged between the second terminal plate 42 and the first shell wall 11.

[0295] The first terminal plate 41 and the second terminal plate 42 are located on the outside of the battery cell housing 1 and can be used to connect with the busbar, etc. The first terminal plate 311 and the second terminal plate 321 are located on the inside of the battery cell housing 1 and can be used to electrically connect with the tab. The terminal plate and the terminal plate can be made of metal, such as copper, aluminum, etc.

[0296] Optionally, the first terminal plate 41, the second terminal plate 42, the first terminal plate 311, and the second terminal plate 321 are each configured to be substantially flat. The shape of the flat plate can be designed according to the situation, for example, it can be rectangular, circular, Fig.18 L-shape shown etc.

[0297] Optionally, the first terminal plate 41 , the second terminal plate 42 , the first terminal plate 311 , and the second terminal plate 321 may be fixed to the first housing wall 11 by means of connecting columns or the like.

[0298] As mentioned above, along the wall thickness direction perpendicular to the first housing wall 11, the first terminal plate 41 and the second terminal plate 42 may partially overlap via a portion of the first insulating member 81. Similarly, along the wall thickness direction perpendicular to the first housing wall 11, the first terminal plate 311 and the second terminal plate 321 may partially overlap via a portion of the insulating member, where the insulating member is an insulating member different from the first insulating member 81, for example, an insulating member located below the first housing wall 11.

[0299] Since the electrode terminal includes a terminal plate located outside the shell of the battery cell 10 and a terminal plate located inside the shell, the electrode terminal can be easily connected to the electrode lug of the electrode assembly through the terminal plate, and the heat dissipation, the support for the first shell wall 11 and the connection strength with the busbar can be improved by designing the terminal plate to be larger, and the shape design freedom of the terminal plate and the terminal plate is relatively high. Moreover, the terminal plate and the terminal plate clamp the first shell wall 11 from the inner and outer sides of the shell 1, respectively, which can improve the bending strength of the first shell wall 11.

[0300] In some embodiments, Figure 7 , Figure 8 , Fig.10 , Fig.13 and Fig.29 As 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 .

[0301] An insulating member may or may not be provided between the second electrode terminal 32 and the first housing wall 11 .

[0302] Optionally, the second electrode terminal 32 is connected to the negative electrode ear, and no insulating member is provided between the second electrode terminal 32 and the first shell wall 11 , so that the first shell wall 11 and even the entire shell 1 are negatively charged.

[0303] Optionally, the second electrode terminal 32 is connected to the positive electrode tab or the negative electrode tab, and a second insulating member 82 is provided between the second electrode terminal 32 and the first shell wall 11 , so that the first shell wall 11 and even the entire shell 1 are insulated from the second electrode terminal 32 and are not charged.

[0304] As a result, the second electrode terminal 32 can also be insulated from the outer shell 1 of the battery cell, so it is applicable not only to a design scheme in which the outer shell is charged, but also to a design scheme in which the outer shell is not charged.

[0305] In some embodiments, the first insulating member 81 and the second insulating member 82 are integrally formed.

[0306] Yes, the first insulating member 81 and the second insulating member 82 can be separate molded parts, or can be an integral molded part formed as one molded part. As a molding method, commonly used molding means, such as mold molding, etc., can be used.

[0307] The first insulating member 81 and the second insulating member 82 can be formed into a shallow tray shape that roughly matches the first electrode terminal 31 and the second electrode terminal 32, so as to accommodate the first electrode terminal 31 and the second electrode terminal 32, so as to be able to insulate the first electrode terminal 31 and the second electrode terminal 32 from the bottom surface and the surrounding surface along the wall thickness direction Z of the first shell wall.

[0308] This can reduce the number of parts and simplify the assembly steps.

[0309] In some embodiments, Fig. 9 , Fig.10 , Fig.13 and Fig.29 As shown, a first recess 111 and a second recess 112 are formed in the first housing wall 11 , and at least a portion of the first insulating member 81 and at least a portion of the second insulating member 82 are located in the recesses.

[0310] The first recessed portion 111 and the second recessed portion 112 are recessed areas formed by the first housing wall 11 being thinned along the wall thickness direction Z of the first housing wall. The top view shape of the recessed area (the shape observed along the wall thickness direction Z of the first housing wall) can be configured to accommodate at least a portion of the first insulating member 81 and at least a portion of the second insulating member 82. The recessed depth of the recessed area can be substantially the same as the height of the first insulating member 81 or the second insulating member 82 (the dimension along the wall thickness direction Z of the first housing wall) or slightly lower than the height of the first insulating member 81 or the second insulating member 82.

[0311] One, two or more first recesses 111 and / or second recesses 112 may be formed on the first housing wall 11 .

[0312] Corresponding to the recessed area, the portion of the first insulating member 81 located in the first recess 111 and the portion of the second insulating member 82 located in the second recess 112 are respectively formed with convex portions, which can be respectively engaged with the first recess 111 and the second recess 112, thereby limiting the movement of the first insulating member 81 and the second insulating member 82 relative to the first shell wall 11 in the surface direction of the first shell wall 11 (perpendicular to the wall thickness direction Z of the first shell wall).

[0313] Therefore, by making at least a portion of the first insulating member 81 and at least a portion of the second insulating member 82 sink into the recess on the first shell wall 11, it is beneficial to improve the installation strength of the insulating member relative to the first shell wall 11, reduce the possibility of displacement of the insulating member along the surface of the first shell wall 11, and also facilitate the positioning of the insulating member and the first shell wall 11 relative to each other during assembly.

[0314] In some embodiments, the first recess 111 and the second recess 112 form the same recess.

[0315] Therefore, compared with forming the recessed portions separately, the processing difficulty is small and the processing is quick.

[0316] In some embodiments, Fig.12 and Fig.13 As shown, along the wall thickness direction of the first shell wall 11, the surface of the first covering portion 811 on the side facing away from the first shell wall 11 does not exceed the surface of the first terminal plate 41 on the side facing away from the first shell wall; and / or, along the wall thickness direction of the first shell wall 11, the surface of the covering portion on the side facing away from the first shell wall does not exceed the surface of the second terminal plate 42 on the side facing away from the first shell wall 11.

[0317] The surface of the first covering portion 811 on the side facing away from the first housing wall 11 may be roughly flush with or slightly lower than the surface of the first terminal plate 41 on the side facing away from the first housing wall. In addition, the surface of the first covering portion 811 on the side facing away from the first housing wall 11 may be roughly 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 cover portion 811 on the side facing away from the first housing wall 11 is roughly flush with the surface of the first terminal plate 41 on the side facing away from the first housing wall, and the surface of the second terminal plate 42 on the side facing away from the first housing wall 11. Here, roughly flush means that there is no obvious step difference.

[0318] Since the surface of the first covering portion 811 facing away from the first shell wall 11 does not exceed the surface of the first terminal plate 41 and / or the second terminal plate 42 facing away from the first shell wall 11, the first covering portion 811 does not occupy additional space of the battery cell or even the battery pack along the wall thickness direction of the first shell wall, and to a certain extent avoids interference between the first covering portion 811 and the busbar, so that the busbar and the first terminal plate 41 and the second terminal plate 42 are reliably connected. In some embodiments, such as Figure 6 As shown, the first terminal plate 41 includes a first main body portion 51 and a first connecting portion 61 connected to each other, and the second terminal plate 42 includes a second main body portion 52 and a second connecting portion 62 connected to each other, and along the length direction of the first shell wall, the first connecting portion 61 and the second connecting portion 62 are located between the first main body portion 51 and the second main body portion 52.

[0319] In some embodiments, Fig. 27 As shown, the first electrode terminal 31 is also provided with a second recessed portion 317, and the second electrode terminal 32 is also provided with a second protruding portion 327. The second protruding portion 327 and the second recessed portion 317 at least partially overlap along the wall thickness direction of the first shell wall 11, and the second protruding portion 327 and the second recessed portion 317 cooperate with each other. The second recessed portion 317 is arranged on the side of the first connecting portion 61 facing the second electrode terminal 32, and the second protruding portion 327 is arranged on the side of the second main body portion 52 facing the first electrode terminal 31.

[0320] The second recessed portion 317 and the second protruding portion 327 may adopt a matching structure similar to that of the recessed portion and the protruding portion, and detailed description thereof is omitted here.

[0321] In the case where the second recessed portion 317 and the second protruding portion 327 are provided, the third connecting column 325 may be omitted.

[0322] Thus, the second recessed portion 317 provided on the first connection portion 61 can be abutted by the second protruding portion 327 provided on the second main body portion 52 and fixed between the second protruding portion 327 and the first housing wall 11, thereby preventing the first connection portion 61 from tilting away from the first housing wall 11 due to its longer extension to a certain extent, thereby improving the bending strength of the first connection portion 61 and the entire first electrode terminal 31. And further enhance the ability of the first electrode terminal assembly 30 and the second electrode terminal 32 to support and fix each other. Thus, even if the first connection portion 61 is not fixed to the first housing wall 11 by rivets, connecting columns, etc., the first connection portion 61 can be reliably in contact with the first housing wall 11, and the risk of poor sealing caused by installing rivets, connecting columns, etc. can also be reduced.

[0323] The recessed portion and the protruding portion may be disposed not only between the main body portion and the connecting portion, but also between two connecting portions.

[0324] In some embodiments, Figure 27 to Figure 29 As shown, the second recessed portion 317 includes a third step portion 3171 and a fourth step portion 3172, and the fourth step portion 3172 is arranged on a side of the third step portion 3171 away from the second electrode terminal; the second protruding portion includes an extension portion provided on the second electrode terminal, and along the wall thickness direction of the first shell wall, a part of the first electrode terminal is located between the extension portion and the first shell wall 11, and the extension portion is at least partially accommodated in the step space formed by the third step portion 3171; the second protruding portion also includes a second covering portion 821 provided on the second insulating member 82, and along the wall thickness direction of the first shell wall, a part of the first electrode terminal is located between the second covering portion 821 and the first shell wall, and the second covering portion 821 is at least partially accommodated in the step space formed by the fourth step portion 3172.

[0325] The third step portion 3171 is formed by a portion of the first terminal plate 41 that becomes lower toward the side away from the first housing wall 11 along the wall thickness direction of the first housing wall 11. Fig.29 The portion of the first terminal plate 41 in the dotted line frame on the right side. The extension portion is accommodated in the third step portion 3171 , and the second insulating member 82 is interposed between the extension portion and the third step portion 3171 .

[0326] Thus, the bending deformation of the first electrode terminal can be limited by the cooperation between the extension and the third step portion 3171, and the extension is further at least partially accommodated in the third step portion 3171, so as to reduce the space occupied by the extension and improve the space utilization. By providing the second covering portion 821, the creepage distance on the surface of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, by accommodating the second covering portion 821 in the step portion, the second covering portion 821 does not occupy additional space, thereby improving the space utilization.

[0327] In some embodiments, Fig.10 , Fig.12 and Fig.13 As shown, the first electrode terminal 31 includes a first terminal plate 41 and a first terminal disc 311 which are electrically connected to each other through a first connecting column 312, wherein the first terminal plate 41 is located on a side of the first shell wall 11 away from the accommodating space, and the first terminal disc 311 is located on a side of the first shell wall 11 facing the accommodating space, the first terminal plate 41 includes a first main body 51 and a first connecting portion 61, and the first terminal disc 311 is connected to the first pole ear 71 in the electrode assembly; the second electrode terminal 32 includes a second terminal plate 42 and a second terminal disc 321 which are electrically connected to each other through a second connecting column 322, wherein the second terminal plate 42 is located on a side of the first shell wall 11 away from the accommodating space, the second terminal disc 321 is located on a side of the first shell wall 11 facing the accommodating space, the second terminal plate 42 includes a second main body 52 and a second connecting portion 62, and the second terminal disc 321 is connected to the second pole ear 72 in the electrode assembly.

[0328] The first electrode terminal 31 includes a first terminal plate 41, a first terminal plate 311 and a first connecting column 312. The first terminal plate 41 is arranged on the surface of the first housing wall 11 away from the accommodation space, and the first terminal plate 41 includes a first main body 51 and a first connecting portion 61, which is used to connect with the busbar 2. The first terminal plate 311 is arranged in the accommodation space, and the first terminal plate 311 is used to connect with the first pole ear 71 in the electrode assembly. The projections of the first terminal plate 41 and the first terminal plate 311 along the wall thickness direction Z of the first housing wall of the battery cell 10 at least partially overlap.

[0329] A through hole is provided on the first housing wall 11, and the projection of the through hole along the wall thickness direction Z of the first housing wall is respectively located in the overlapping area of ​​the first terminal plate 41 and the first terminal plate 311. The first connecting column 312 passes through the through hole, and the two ends of the first connecting column 312 are respectively connected to the first terminal plate 41 and the first terminal plate 311. An insulating member is provided at least between the first connecting column 312 and the through hole.

[0330] The second electrode terminal 32 includes a second terminal plate 42, a second terminal plate 321, and a second connecting column 322. The second terminal plate 42 is arranged on the surface of the first housing wall 11 away from the accommodation space, and the second terminal plate 42 includes a second main body 52 and a second connecting portion 62, which are used to connect with the busbar 2. The second terminal plate 321 is arranged in the accommodation space, and the second terminal plate 321 is used to connect with the second pole ear 72 in the electrode assembly. The projections of the second terminal plate 42 and the second terminal plate 321 along the wall thickness direction Z of the first housing wall of the battery cell 10 at least partially overlap.

[0331] A through hole is provided on the first housing wall 11, and the projection of the through hole along the wall thickness direction Z of the first housing wall is respectively located in the overlapping area of ​​the second terminal plate 42 and the second terminal plate 321. The second connecting column 322 passes through the through hole, and the two ends of the second connecting column 322 are respectively connected to the second terminal plate 42 and the second terminal plate 321. An insulating member is provided at least between the second connecting column 322 and the through hole.

[0332] Thus, the first connecting column 312 penetrates the first shell wall 11 to realize the electrical connection between the first terminal plate 41 and the first terminal disk 311, so that the first pole ear 71 can be conductive with the outside world; the second connecting column 322 penetrates the first shell wall 11 to realize the electrical connection between the second terminal plate 42 and the second terminal disk 321, so that the second pole ear 72 can be conductive with the outside world.

[0333] In some embodiments, Fig.10 As shown, a first connecting column 312 is provided in the first main body 51, and the first connecting column 312 is connected to the first pole ear 71. A second connecting column 322 is provided in the second main body 52, and the second connecting column 322 is connected to the second pole ear 72. The material of the first main body 51 and the second main body 52 is different from the material of the first overlapping part 91.

[0334] The electrode assembly is provided with a first pole lug 71 and a second pole lug 72. One of the first pole lug 71 and the second pole lug 72 has a positive polarity and is generally made of aluminum. The connecting column and the main body connecting the pole lug with positive polarity are also made of aluminum. The other of the first pole lug 71 and the second pole lug 72 has a negative polarity and is generally made of copper. The connecting column and the main body connecting the pole lug with negative polarity are also made of copper. The first connecting portion 61 and the second connecting portion 62 can be made of aluminum or copper.

[0335] In an optional embodiment, if Figure 4 and Fig.10 As shown, the first pole lug 71 has a positive polarity, and the second pole lug 72 has a negative polarity. The first pole lug 71, the first connecting column 312, and the first terminal plate 41 are all made of aluminum. The second pole lug 72 and the second connecting column 322 are all made of copper, and the second terminal plate 42 is made of aluminum. A copper sheet that is conductive to the second terminal plate 42 is provided on the second terminal plate 42, and the second connecting column 322 is provided to be electrically connected to the copper sheet.

[0336] Therefore, when the materials of the first electrode tab 71 and the second electrode tab 72 are different, the material of the main body can be selected to be the material of the corresponding electrode tab to achieve a stronger conduction effect.

[0337] In some embodiments, Figure 6 As shown, the length of the first shell wall 11 along the length direction X of the first shell wall is L, and L is less than or equal to 450 mm.

[0338] The length of the first housing wall 11 along the length direction X of the first housing wall is greater than or equal to 450 mm, that is, L≥450 mm.

[0339] Thus, the first housing wall 11 has a sufficient length to accommodate the first electrode terminal 31 and the second electrode terminal 32 .

[0340] In a second aspect, the present application also provides a battery, such as Figure 3 As shown, it includes a box body 20 and the battery cell 10 provided in the first aspect.

[0341] A plurality of battery cells 10 are placed in a box 20 , and a busbar 2 is provided between the plurality of battery cells 10 for electrical connection.

[0342] Since the battery includes the battery cell 10 with relatively strong structural strength, it helps to ensure that the battery can still operate normally after being subjected to bumps and impacts, thereby improving the reliability of battery use.

[0343] In some embodiments, Figures 18 to 20 As shown, each battery cell 10 is arranged along the width direction Y of the first shell wall. In adjacent battery cells 10, the first connection portion 61 of one battery cell 10 and the second connection portion 62 of another battery cell 10 at least partially overlap along the width direction Y of the first shell wall and are electrically connected through the busbar 2.

[0344] The battery cells 10 are arranged along the width direction Y of the first shell wall, the first connection parts 61 and the second connection parts 62 are arranged alternately along the width direction Y of the first shell wall, the first connection parts 61 and the second connection parts 62 between adjacent battery cells 10 are adjacent to each other, and the projections of the first overlapping parts 91 of each battery cell 10 along the width direction Y of the first shell wall overlap with each other.

[0345] The first electrode terminal 31 of one battery cell 10 and the second electrode terminal 32 of another battery cell 10 can be of the same polarity, and the busbar 2 connects the two to realize parallel connection between the battery cells 10, providing a sufficient amount of electricity. The first electrode terminal 31 of one battery cell 10 and the second electrode terminal 32 of another battery cell 10 can be of opposite polarity, and the busbar 2 connects the two to realize series connection between the battery cells 10, providing a sufficient voltage.

[0346] On a battery cell 10, the busbar 2 covers at least a portion of the surface of the first electrode terminal 31 away from the first shell wall 11, but does not cover the second electrode terminal 32 on the battery cell 10. In other words, along the wall thickness direction Z of the first shell wall of the battery cell 10, the projection of the busbar 2 overlaps with the first electrode terminal 31 and is located outside the second electrode terminal 32.

[0347] On another battery cell 10, the busbar 2 covers at least a portion of the surface of the second electrode terminal 32 away from the first housing wall 11, but does not cover the first electrode terminal 31 on the battery cell 10. In other words, along the wall thickness direction Z of the first housing wall of the battery cell 10, the projection of the busbar 2 overlaps with the second electrode terminal 32 and is located outside the first electrode terminal 31.

[0348] Since the battery cells 10 are arranged along the width direction Y of the first housing wall, and the first connection portion 61 and the second connection portion 62 at least partially overlap along the width direction Y of the first housing wall, the first connection portion 61 and the second connection portion 62 of adjacent battery cells 10 are adjacent to each other. Since the first connection portion 61 and the second connection portion 62 on adjacent battery cells 10 are connected by the busbar 2, and the first connection portion 61 and the second connection portion 62 on adjacent battery cells 10 are adjacent to each other, it is helpful to shorten and simplify the connection path of the busbar 2, and save the material of the busbar 2.

[0349] In some embodiments, in adjacent battery cells 10 , the first overlapping portion 91 of the first connecting portion 61 of one battery cell 10 is electrically connected to the first overlapping portion 91 of the second connecting portion 62 of another battery cell 10 through the busbar 2 .

[0350] The projection of the first overlapping portion 91 of the first connecting portion 61 of one battery cell 10 overlaps with the projection of the first overlapping portion 91 of the second connecting portion 62 of another battery cell 10 along the width direction Y of the first shell wall, and the busbar 2 can be constructed into a regular shape to cover the first overlapping portions 91 of the two.

[0351] Since the battery cells 10 are arranged along the width direction Y of the first housing wall, the first overlapping portion 91 of the first connecting portion 61 and the first overlapping portion 91 of the second connecting portion 62 are arranged along the width direction Y of the first housing wall. By connecting the first overlapping portion 91 of the first connecting portion 61 of one battery cell 10 and the first overlapping portion 91 of the second connecting portion 62 of another battery cell 10 through the busbar 2, the busbar 2 is arranged along the width direction Y of the first housing wall, which helps to shorten and simplify the connection path of the busbar 2 and save the material of the busbar 2.

[0352] In some embodiments, among adjacent battery cells 10 , at least one of the first body portion 51 of one battery cell 10 and the second body portion 52 of another battery cell 10 is electrically connected to the busbar 2 .

[0353] Since the busbar 2 can be connected to the main body in addition to the connecting portion, the busbar 2 and the electrode terminal can have a larger connecting area, which helps to enhance the current flow capacity.

[0354] In some embodiments, Fig.23 and Fig.24 As shown, at least one box wall of the box body 20 has a boss 1111a, and the boss 1111a is formed by the box wall bulging in the direction away from the battery cell 10. The boss 1111a forms a receiving portion 1111b on the side facing the battery cell 10. Along the direction perpendicular to the box wall on which the boss 1111a is formed, the projections of the first electrode terminal 31 and the second electrode terminal 32 do not exceed the projection of the boss 1111a, and the first electrode terminal 31 and / or the second electrode terminal 32 are at least partially received in the receiving portion 1111b.

[0355] Thus, only the height of the box body where the first electrode terminal 31, the second electrode terminal 32 and the busbar are located can be increased, so that the size of the battery can be suppressed, which is also beneficial to improving the volume utilization of the battery.

[0356] In a third aspect, the present application further provides an electrical device, which includes a plurality of battery cells 10 provided in the first aspect or a plurality of batteries provided in the second aspect, and the battery cells 10 or the batteries provide power for the electrical device.

[0357] like Figure 1 As shown, the electrical device may be a vehicle 1000 .

[0358] This helps the electrical device to adapt to working conditions such as bumps and vibrations, and improves the operating stability of the electrical device.

[0359] In a fourth aspect, the present application also provides an energy storage device 2000, such as Figure 2As shown, the energy storage device 2000 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 batteries are used to store electrical energy and can provide electrical energy.

[0360] This helps to make the energy storage device 2000 suitable for operating conditions such as bumps and vibrations, and improves the stability of energy storage in the energy storage device.

[0361] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

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 is disposed in the accommodation space; and A first electrode terminal, provided on the first housing wall, the first electrode terminal comprising a first connecting portion for connecting to a first busbar; A second electrode terminal, provided on the first housing wall, the second electrode terminal comprising a second connecting portion for connecting to a second busbar; The first connection portion and the second connection portion are arranged along the width direction of the first shell wall, and projections of the first connection portion and the second connection portion along the width direction of the first shell wall at least partially overlap.

2. The battery cell according to claim 1, characterized in that: The first electrode terminal further includes a first main body connected to the first connecting portion, and the second electrode terminal further includes a second main body connected to the second connecting portion. Along the length direction of the first shell wall, at least a portion of the first connecting portion and at least a portion of the second connecting portion are located between the first main body portion and the second main body portion.

3. The battery cell according to claim 2, characterized in that: The length of the first main body portion along the width direction of the first shell wall is greater than or equal to the first connecting portion; and / or, A length of the second main body portion along a width direction of the first shell wall is greater than or equal to the second connecting portion.

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

5. The battery cell according to claim 2, characterized in that: The projections of the first main body portion and the second connecting portion along the length direction of the first shell wall overlap, and / or the projections of the second main body portion and the first connecting portion along the length direction of the first shell wall overlap.

6. The battery cell according to claim 5, characterized in that: A gap is formed between the first connecting portion and the first main body portion, and the second connecting portion is at least partially located in the gap.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The length of the first shell wall along the length direction of the first shell wall is L, the length of the first connecting portion along the length direction of the first shell wall is A1, and the length of the second connecting portion along the length direction of the first shell wall is A2, then 10%≤A1 / L≤40%, and / or 10%≤A2 / L≤40%.

8. The battery cell according to any one of claims 1 to 6, characterized in that: Along the width direction of the first housing wall, the first connecting portion and the second connecting portion have a first overlapping portion, A length of the first overlapping portion along a length direction of the first housing wall is in a range of 3 mm to 50 mm.

9. The battery cell according to claim 7, characterized in that: Along the width direction of the first housing wall, the first connecting portion and the second connecting portion have a first overlapping portion, A length of the first overlapping portion along a length direction of the first housing wall is in a range of 3 mm to 50 mm.

10. The battery cell according to any one of claims 2 to 6, characterized in that: Along the width direction of the first housing wall, the first main body portion and the second main body portion are located between the first connecting portion and the second connecting portion.

11. The battery cell according to claim 10, characterized in that: Along the length direction of the first shell wall, the first main body portion and the second main body portion have a second overlapping portion, The length of the first shell wall along the width direction of the first shell wall 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.

12. The battery cell according to claim 10, characterized in that: The length of the first main body along the width direction of the first shell wall is B1, the length of the second main body along the width direction of the first shell wall is B2, and the absolute value of the difference between B1 and B2 is greater than or equal to 0 mm.

13. The battery cell according to claim 11, characterized in that: The length of the first main body along the width direction of the first shell wall is B1, the length of the second main body along the width direction of the first shell wall is B2, and the absolute value of the difference between B1 and B2 is greater than or equal to 0 mm.

14. The battery cell according to claim 12, characterized in that: The absolute value of the difference between B1 and B2 is in the range of 0 mm to 50 mm.

15. The battery cell according to any one of claims 1 to 6, 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.

16. The battery cell according to claim 15, 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 2.0 mm.

17. The battery cell according to any one of claims 2 to 6, characterized in that: The first electrode terminal and the second electrode terminal each include a connection region for connecting to a bus bar for electrically connecting the plurality of battery cells to each other.

18. The battery cell according to claim 17, characterized in that: Along the width direction of the first housing wall, the first connecting portion and the second connecting portion have a first overlapping portion, The connection area is formed at least at the first overlapping portion.

19. The battery cell according to claim 18, characterized in that: The connection area is also formed in at least one of the first body portion and the second body portion.

20. The battery cell according to claim 18, characterized in that: The area of ​​the connection region formed in the first overlapping portion is SA, and the area of ​​the entire connection region is S, then SA accounts for 50% to 100% of S.

21. The battery cell according to claim 17, characterized in that: The offset distance of the centerline position of the connection area formed in the first connection 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.

22. The battery cell according to any one of claims 2 to 6, 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.

23. The battery cell according to claim 22, 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 electrode piece, and the second electrode terminal is electrically connected to the second electrode piece.

24. The battery cell according to claim 22, characterized in that: The first insulating member is partially disposed between the first electrode terminal and the first housing wall.

25. The battery cell according to claim 22, 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.

26. The battery cell according to claim 25, characterized in that: The first electrode terminal comprises 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 comprises a second terminal plate, the second terminal plate is disposed on a side of the first housing wall away from the accommodation space, and the first insulating member is fixed to the first terminal plate; Along the wall thickness direction of the first shell wall, the first terminal plate, the first insulating member and the second terminal plate partially overlap, and the second terminal plate is partially arranged between the first insulating member and the first shell wall, and the first terminal plate abuts against the first insulating member.

27. The battery cell according to claim 26, 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, 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.

28. The battery cell according to claim 26, characterized in that: The first electrode terminal assembly 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.

29. The battery cell according to claim 28, characterized in that: 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 electrode terminal assembly; The first protrusion includes an extension portion provided on the first electrode terminal, a portion of the second electrode terminal is located between the extension portion and the first shell wall along the wall thickness direction of the first shell wall, and the extension portion is at least partially accommodated in a step space formed by the first step portion; The first protrusion also includes a covering portion provided by the first insulating member, and along the wall thickness direction of the first shell wall, a portion of the second electrode terminal is located between the covering portion and the first shell wall, and the covering portion is at least partially accommodated in the step space formed by the second step portion.

30. The battery cell according to claim 29, characterized in that Along the wall thickness direction of the first housing wall, the surface of the 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 cover 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.

31. The battery cell according to claim 28, characterized in that The first recessed portion is disposed on a side of the second connecting 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.

32. The battery cell according to claim 31, 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 connecting 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.

33. The battery cell according to claim 32, 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.

34. The battery cell according to claim 26, characterized in that The battery cell further includes a second insulating member at least partially disposed between the second terminal plate and the first housing wall.

35. The battery cell according to claim 34, 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.

36. The battery cell according to claim 22, characterized in that Along the width direction of the first housing wall, the first connecting portion and the second connecting portion have a first overlapping portion, A first connecting column is provided on the first main body, and the first connecting column is connected to the first electrode tab. The second main body is provided with a second connecting column, and the second connecting column is connected to the second electrode tab. 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.

37. The battery cell according to any one of claims 1 to 6, characterized in that: The length of the first shell wall along the length direction of the first shell wall is L, and L is less than or equal to 450 mm.

38. A battery, characterized in that: The invention comprises a casing and at least two battery cells according to any one of claims 1 to 37.

39. The battery according to claim 38, characterized in that The battery cells are arranged along the width direction of the first housing wall. In the adjacent battery cells, the first connection portion of one battery cell and the second connection portion of another battery cell at least partially overlap in the width direction of the first housing wall and are electrically connected through a busbar.

40. The battery according to claim 39, characterized in that In the adjacent battery cells, a first overlapping portion of the first connecting portion of one of the battery cells and a first overlapping portion of the second connecting portion of another of the battery cells are electrically connected through a bus bar.

41. The battery according to claim 40, 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.

42. A battery according to any one of claims 39 to 41, 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.

43. An electrical device, characterized in that: The electrical device comprises a plurality of battery cells according to any one of claims 1 to 37, or a battery according to any one of claims 36 to 42, and the battery cells or the battery provide power for the electrical device.

44. 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 37, or a battery according to any one of claims 38 to 42, wherein the battery cells or the battery are used to store electrical energy and can provide electrical energy.

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