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 at least partially arranged in the accommodating space; the first electrode terminal assembly is arranged on the first shell wall; a second electrode terminal provided on the first case wall; at least part of the second electrode terminal is arranged between the first electrode terminal assembly and the first shell wall in the wall thickness direction of the first shell wall, and the first electrode terminal assembly abuts against the second electrode terminal. 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 shell of the battery cell tends to be larger and thinner. In this case, the shell of the battery cell tends to be insufficient in strength and prone to bending and deformation. In addition, there are sometimes undesirable situations where the electrode terminals provided on the shell are deformed or broken. Therefore, how to improve the strength of the electrode terminals and the shell of the battery cell 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 electrode terminals and a shell of the battery cell.

[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, at least partially disposed in the accommodating space; a first electrode terminal assembly, disposed in the first shell wall; a second electrode terminal, disposed in the first shell wall; wherein, along the wall thickness direction of the first shell wall, at least a portion of the second electrode terminal is disposed between the first electrode terminal assembly and the first shell wall, and the first electrode terminal assembly abuts against the second electrode terminal.

[0006] In the embodiment of the present application, since the second electrode terminal is at least partially arranged between the first electrode terminal assembly and the first shell wall, and the first electrode terminal assembly abuts against the second electrode terminal, the support and fixation of the second electrode terminal by the first electrode terminal assembly can be strengthened, and the ability of the second electrode terminal to resist bending and deformation can be improved; and the ability of the area in the first shell wall where the first electrode terminal and the second electrode terminal are arranged can be strengthened.

[0007] In some embodiments, the first electrode terminal assembly includes a first electrode terminal and 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.

[0008] 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.

[0009] 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 of the electrode assembly, and the second electrode terminal is electrically connected to the second electrode piece of the electrode assembly.

[0010] 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.

[0011] In some embodiments, the first insulating member is partially disposed between the first electrode terminal and the first housing wall.

[0012] This makes it possible to insulate the first electrode terminal from the first case wall.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] In some embodiments, the first electrode terminal includes a first terminal disc, at least a portion of which is disposed on a side of the first shell wall facing the accommodating space, and the second electrode terminal includes a second terminal disc, at least a portion of which is disposed on a side of the first shell wall facing the accommodating space, and along the wall thickness direction of the first shell wall, the first terminal disc is at least partially disposed between the second terminal disc and the first shell wall; or, along the wall thickness direction of the first shell wall, the second terminal disc is at least partially disposed between the first terminal disc and the first shell wall.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] In some embodiments, the first recessed portion includes a first step portion and a second step portion, the second step portion being disposed 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, 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 protruding portion also includes a first covering portion provided on the first insulating member, a portion of the second electrode terminal is located between the first covering portion and the first shell wall along the wall thickness direction of the first shell wall, and the first covering portion is at least partially accommodated in the step space formed by the second step portion.

[0022] 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 first covering portion, the creepage distance on the surface of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, by accommodating the first covering portion in the step portion, the first covering portion does not occupy additional space, thereby improving the space utilization.

[0023] In some embodiments, along the wall thickness direction of the first shell wall, the surface of the first 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 first shell wall; and / or, along the wall thickness direction of the first shell wall, the surface of the first 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.

[0024] Since the surface of the first 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 first covering portion does not protrude from the first terminal plate and / or the second terminal plate, thereby reducing the size of the battery cell and even the battery pack along the wall thickness direction of the first shell wall; and to a certain extent, it avoids interference between the first covering portion and the busbar, thereby facilitating reliable connection of the busbar and the first terminal plate and the second terminal plate.

[0025] In some embodiments, along the wall thickness direction of the first shell wall, the height difference between the surface of the first terminal plate facing away from the shell wall and the surface of the second terminal plate facing away from the first shell wall is greater than or equal to 0 and does not exceed 0.5 mm.

[0026] As a result, the first terminal plate and the second terminal plate are almost flush, which helps to share external pressure and improve the ability to resist deformation.

[0027] In some embodiments, the first terminal plate includes a first main body and a first extension portion connected to each other, and the second terminal plate includes a second main body and a second extension portion connected to each other, along the length direction of the first shell wall, at least a portion of the first extension portion and at least a portion of the second extension portion are located between the first main body and the second main body, and the first extension portion and the second extension portion are arranged along the width direction of the first shell wall.

[0028] Thus, the terminal board can be designed to have a main body and an extension, which can stably connect the terminal board to the first housing wall, increase the heat dissipation area of ​​the electrode terminal, and increase the connection area and connection reliability between the electrode terminal and the busbar. In addition, since the first extension and the second extension are located between the first main body and the second main body along the length direction of the first housing wall, the bending strength of the region where the electrode terminal is arranged in the first housing wall can be enhanced by the cooperation of the two terminal boards.

[0029] In some embodiments, along the width direction of the first shell wall, the first extension portion and the second extension portion have a first overlapping portion.

[0030] Thus, by arranging the first extension portion and the second extension portion to overlap in the width direction of the first housing wall, the synergistic effect of the two electrode terminals can be used to improve the bending strength of the region in the first housing wall where the electrode terminal is arranged. Moreover, the first electrode terminal assembly and the second electrode terminal can be arranged as compactly as possible, which is beneficial to the utilization of the non-electrode terminal arrangement region of the first housing wall, and further beneficial to improving the volume utilization of the battery pack.

[0031] In some embodiments, 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.

[0032] In this way, the materials of the first main body and the second main body can be set according to the situation, which helps to reduce current loss, improve heat dissipation capacity, etc.

[0033] In some embodiments, the first electrode terminal also includes a first terminal plate, at least a portion of which is disposed on a side of the first shell wall facing the accommodating space, and the second electrode terminal also includes a second terminal plate, at least a portion of which is disposed on a side of the first shell wall facing the accommodating space, and the first main body and the first terminal plate are directly connected via a first connecting column; the second main body and the second terminal plate are directly connected via a second connecting column.

[0034] Since the terminal plate and the terminal disk can be connected together through the connecting column, they can function as electrode terminals to draw current from the electrode assembly. Moreover, the connecting column is provided in the main body, so that the electrode terminal can be reliably fixed to the first housing wall in the main body.

[0035] In some embodiments, the first recessed portion is disposed on a side of the second extending portion facing the first electrode terminal, and the first protruding portion is disposed on a side of the first main body portion facing the second electrode terminal.

[0036] Thus, the first recessed portion provided on the second extension portion can be abutted by the first protruding portion provided on the first main body portion and fixed between the first protruding portion and the first shell wall, thereby preventing the second extension portion from warping in a direction away from the first shell wall due to its longer extension to a certain extent, thereby improving the bending strength of the second extension 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.

[0037] 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 extension 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.

[0038] Thus, the second recessed portion provided in the first extension 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 extension 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 extension 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 extension portion is not fixed to the first shell wall by rivets, connecting columns, etc., the first extension 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.

[0039] 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.

[0040] 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.

[0041] In some embodiments, the first extension portion is connected to the first terminal plate, the first recessed portion is disposed on a side of the second extension portion facing the first electrode terminal, and the first protruding portion is disposed on a side of the first extension portion facing the second electrode terminal.

[0042] Thus, a structure in which a first protrusion and a first recessed portion cooperate with each other can be formed between the two extension portions, and the first protrusion of the first extension portion fixed to the first shell wall can be used to press the first recessed portion of the second extension portion onto the first shell wall, thereby achieving mutual support of the two electrode terminals, which is beneficial to improving the bending strength of the electrode terminals.

[0043] In some embodiments, the battery cell further includes a second insulating member, the second insulating member being at least partially located between the second electrode terminal and the first housing wall.

[0044] This allows the second 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.

[0045] In some embodiments, the first insulating member and the second insulating member are integrally formed.

[0046] This can reduce the number of parts and simplify the assembly steps.

[0047] 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.

[0048] 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.

[0049] In some embodiments, the first recess and the second recess form a same recess.

[0050] Therefore, compared with forming the recessed portions separately, the processing difficulty is small and the processing is quick.

[0051] 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.

[0052] 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.

[0053] In some embodiments, the first electrode terminal assembly includes a first electrode terminal, the first electrode terminal includes a first terminal plate, at least a portion of the first terminal plate is disposed on a side of the first shell wall away from the accommodating space, the second electrode terminal includes a second terminal plate, the second terminal plate is disposed on a side of the first shell wall away from the accommodating space, along the wall thickness direction of the first shell wall, the first terminal plate partially overlaps with the second terminal plate, and the first terminal plate directly or indirectly abuts against the second terminal plate.

[0054] Thus, a structure for supporting and fixing the first terminal board to the second terminal board can be formed on the side of the first housing wall away from the accommodation space, which can limit the bending deformation of the second terminal board in the direction away from the first housing wall; or a structure for supporting and fixing the second terminal board to the first terminal board can be formed on the side of the first housing wall away from the accommodation space, which can limit the bending deformation of the first terminal board in the direction away from the first housing wall. Accordingly, the bending resistance of this area in the first housing wall is improved.

[0055] In some embodiments, the first electrode terminal assembly includes a first electrode terminal, the first electrode terminal includes a first terminal plate, at least a portion of the first terminal plate is disposed on a side of the first shell wall away from the accommodating space, the first terminal plate includes a first main body and a first extension portion connected to each other, the second electrode terminal includes a second terminal plate, the second terminal plate is disposed on a side of the first shell wall away from the accommodating space, the second terminal plate includes a second main body and a second extension portion connected to each other, along the length direction of the first shell wall, at least a portion of the first extension portion and at least a portion of the second extension portion are located between the first main body and the second main body, and the first extension portion and the second extension portion are arranged along the width direction of the first shell wall.

[0056] Thus, the terminal board can be designed to have a main body and an extension, which can stably connect the terminal board to the first housing wall, increase the heat dissipation area of ​​the electrode terminal, and increase the connection area and connection reliability between the electrode terminal and the busbar. In addition, since the first extension and the second extension are located between the first main body and the second main body along the length direction of the first housing wall, the bending strength of the region where the electrode terminal is arranged in the first housing wall can be enhanced by the cooperation of the two terminal boards.

[0057] In some embodiments, along the wall thickness direction of the first shell wall, the overlapping portion of the first electrode terminal assembly and the second electrode terminal is an overlapping area, the length of the overlapping area along the width direction of the first shell wall is W11, the length of the first shell wall along the width direction is W, and W11 is in the range of 10% to 90% of W.

[0058] Thus, the first shell wall can be fully utilized along the width direction of the first shell wall, and the supporting force between the first electrode terminal assembly and the second electrode terminal assembly can be effectively improved, the bending strength of the electrode terminal can be improved, and the strength of the first shell wall around the electrode terminal can be strengthened.

[0059] In some embodiments, W11 is in the range of 0.5 mm to 50 mm.

[0060] Thus, the size of the overlapping area along the width direction of the first shell wall can be determined according to the size of the first shell wall along the width direction of the first shell wall, and by setting the size of the overlapping area along the width direction of the first shell wall to be larger, the supporting force between the first electrode terminal assembly and the second electrode terminal can be improved, the bending strength of the electrode terminal can be improved, and the strength of the first shell wall around the electrode terminal can be strengthened.

[0061] In some embodiments, the length of the overlapping area along the length direction of the first shell wall is L11, and L11 is in the range of 0.5 mm to 6 mm.

[0062] Therefore, by setting the length of the overlapping area along the length direction of the first shell wall to be smaller, the matching strength between the protruding portion and the recessed portion can be improved, and it is beneficial to improve the space utilization rate.

[0063] In some embodiments, a dimension of the first main body along the width direction of the first shell wall is B1, a dimension of the first extension portion along the width direction of the first shell wall is W1, and B1 is greater than or equal to W1; and / or a dimension of the second main body along the length direction of the first shell wall is B2, a dimension of the second extension portion along the length direction of the first shell wall is W2, and B2 is greater than or equal to W2.

[0064] Thus, the degree of freedom in setting the shape of the electrode terminal can be increased, and the electrode terminal can be appropriately set according to the size of the first shell wall (especially the size along the width direction of the first shell wall), which is also conducive to the compact arrangement of the two electrode terminals. 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 extension part and the second extension part along the width direction of the first shell wall smaller is conducive to reducing the weight of the electrode terminal and even the battery cell and battery pack. Moreover, the first extension part and the second extension part can also be used to form a current bottleneck, thereby eliminating the process of separately processing the current bottleneck.

[0065] In some embodiments, the first extension portion is offset relative to the center position of the first main body portion along the width direction of the first shell wall; and / or the second extension portion is offset relative to the center position of the second main body portion along the width direction of the first shell wall.

[0066] Thus, the dimension of the first shell wall along the width direction of the first shell wall can be fully utilized to arrange the first extension part and the second extension part along the width direction of the first shell wall, which is beneficial for compactly arranging the first electrode terminal and the second electrode terminal.

[0067] In some embodiments, the dimension of the first shell wall in the length direction is L, the dimension of the first overlapping portion along the length direction of the first shell wall is A, and A is in the range of 10% to 40% of L.

[0068] Therefore, setting the first overlapping portion to be longer is beneficial to improving the strength of the electrode terminal arrangement area in the first shell wall and even the entire first shell wall.

[0069] In some embodiments, A is in the range of 3 mm to 50 mm.

[0070] Therefore, setting the first overlapping portion to be longer is beneficial to improving the strength of the electrode terminal arrangement area in the first shell wall and even the entire first shell wall.

[0071] 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.

[0072] Therefore, since there are overlapping parts in the length direction of the first shell wall and the width direction of the first shell wall, the first electrode terminal and the second electrode terminal can be compactly arranged in the length direction of the first shell wall and the width direction of the first shell wall, and the bending strength of the first shell wall can be further improved.

[0073] In some embodiments, a dimension of the first shell wall along the width direction is W, a dimension 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.

[0074] Therefore, the length dimension of the second overlapping area along the width direction of the first shell wall is set to be longer, which is beneficial to enhancing the strength of the first shell wall.

[0075] 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.

[0076] This can reduce the possibility of the first electrode terminal and the second electrode terminal being short-circuited with each other.

[0077] In some embodiments, the first electrode terminal and the second electrode terminal each include a connection region for connecting to a busbar, the busbar being used to electrically connect the plurality of battery cells to each other, and the connection region is formed at least at the first overlapping portion.

[0078] Thus, the busbar is connected to the portion where the first overlapping portion is formed between the first electrode terminal and the second electrode terminal. Since this portion has a strong bending strength, even if the busbar causes bending stress to act on the first electrode terminal, the second electrode terminal and the first shell wall, the first electrode terminal, the second electrode terminal and the first shell wall are not easily bent and deformed, and are less likely to break due to bending deformation.

[0079] In some embodiments, the connection area is also formed in at least any one of the first body portion and the second body portion.

[0080] This can further enhance the connection strength between the electrode terminal and the busbar, further disperse the bending stress caused by the busbar, and further improve the deformation resistance of the electrode terminal and the first shell wall.

[0081] 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.

[0082] Therefore, the narrow side walls of the long strip battery cells can be fully utilized to configure the electrode terminals, which improves the flexibility of battery cell grouping and is also beneficial to large-area heat dissipation.

[0083] In a second aspect, an embodiment of the present application further provides a battery, comprising a housing and at least two battery cells provided in the first aspect of the present application.

[0084] This can provide a battery in which the strength of the first housing wall in the battery cell is enhanced, which helps to improve the reliability of the battery.

[0085] In some embodiments, the battery cells are arranged along a width direction of the first housing wall.

[0086] This is beneficial to improving the volume utilization of the battery.

[0087] In some embodiments, the first electrode terminal assembly includes a first electrode terminal, the first electrode terminal includes a first main body and a first extension portion connected to each other, the second electrode terminal includes a second main body and a second extension portion connected to each other, along the length direction of the first shell wall, at least a portion of the first extension portion and at least a portion of the second extension portion are located between the first main body and the second main body, and in adjacent battery cells, the first extension portion of one battery cell and the second extension portion of another battery cell are arranged along the width direction and are electrically connected through a busbar.

[0088] Since the busbar is connected to the first extension portion and the second extension portion between the first main body portion and the second main body portion, the connection portion has a strong bending resistance. Therefore, the first electrode terminal, the second electrode terminal and the first shell wall are not prone to bending, deformation or breakage, thereby improving the reliability of the battery.

[0089] In some embodiments, in the same battery cell, along the width direction of the first shell wall, the first extension portion and the second extension portion have a first overlapping portion, and in adjacent battery cells, the first overlapping portion of one battery cell is electrically connected to the first overlapping portion of another battery cell through the busbar.

[0090] Thus, the busbar is connected to a portion of the first electrode terminal and the second electrode terminal where the first overlapping portion is formed. Since this portion has a strong bending resistance, even if the busbar causes bending stress to act on the first electrode terminal, the second electrode terminal and the first shell wall, the first electrode terminal, the second electrode terminal and the first shell wall are not easily bent and deformed, and are less likely to break due to bending and deformation, thereby improving the reliability of the battery.

[0091] 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, and 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 assembly and the second electrode terminal do not exceed the projection of the boss, and the first electrode terminal assembly and / or the second electrode terminal are at least partially accommodated in the accommodating portion.

[0092] Thus, only the height of the box body where the first electrode terminal assembly, the second electrode terminal and the current collector are located can be increased, thereby reducing the size of the battery and facilitating improving the volume utilization of the battery.

[0093] 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.

[0094] Thus, an electrical device equipped with a battery whose electrode terminals and casing are not prone to bending or have a small degree of bending deformation can be provided, thereby improving the reliability of the electrical device and reducing the maintenance time of the electrical device.

[0095] 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 configured to store and provide electrical energy.

[0096] Thus, an energy storage device using a battery whose electrode terminals and casing are not prone to bending or have a small degree of bending deformation can be provided, thereby improving the reliability of the energy storage device and reducing the maintenance time of the energy storage device.

[0097] 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

[0098] 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:

[0099] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application;

[0100] Figure 2 A schematic diagram of the structural decomposition of a battery provided in some embodiments of the present application;

[0101] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0102] Figure 4 A three-dimensional schematic diagram of a battery cell provided for some embodiments of the present application;

[0103] Figure 5 for Figure 4 A partial enlarged schematic diagram of part A;

[0104] Figure 6 A schematic top view of a battery cell provided for some embodiments of the present application;

[0105] Figure 7 For along Figure 6 A schematic cross-sectional view of the middle BB;

[0106] Figure 8 for Figure 7 A partial enlarged schematic diagram of part C in the middle;

[0107] Fig. 9 It is a cross-sectional schematic diagram of other embodiments of the present application;

[0108] Fig.10 for Fig. 9 A partial enlarged schematic diagram of the C1 part;

[0109] Fig.11 for Fig. 9 A partial enlarged schematic diagram of the C2 part;

[0110] Fig.12 is a cross-sectional schematic diagram of yet another embodiment of the present application;

[0111] Fig.13 for Fig.12 A partial enlarged schematic diagram of the C3 part;

[0112] Fig.14A schematic top view of a battery cell provided in another embodiment of the present application;

[0113] Fig.15 A schematic top view of a battery cell provided in yet another embodiment of the present application;

[0114] Fig.16 A three-dimensional schematic diagram of a battery cell provided in yet another embodiment of the present application;

[0115] Fig.17 for Fig.16 A partial enlarged schematic diagram of part D in the middle;

[0116] Fig.18 A schematic top view of a battery cell provided in yet another embodiment of the present application;

[0117] Fig.19 For along Fig.18 Schematic cross-sectional view of EE;

[0118] Fig. 20 for Fig.19 A partial enlarged schematic diagram of part F in the middle;

[0119] Fig.21 A schematic diagram of the structure of a first shell wall provided in some embodiments of the present application;

[0120] Fig. 22 A schematic diagram of a structure in which a plurality of battery cells are grouped according to some embodiments of the present application;

[0121] Fig.23 An exploded schematic diagram of an electrode connection terminal provided in some embodiments of the present application;

[0122] Fig.24 A schematic top view of a battery cell provided in some embodiments of the present application;

[0123] Fig.25 Another schematic top view of a battery cell provided in some embodiments of the present application;

[0124] Fig.26 A schematic diagram of the structure of an energy storage device provided in some embodiments of the present application;

[0125] Fig. 27 A schematic cross-sectional view of a battery with a boss provided for some embodiments of the present application;

[0126] Fig.28 for Fig.14 Schematic cross-sectional view of middle GG;

[0127] Fig.29 for Fig.28 A partial enlarged schematic diagram of part H in the middle.

[0128] Description of Reference Numerals

[0129] 1000 vehicle; 100 battery; 200 controller; 300 motor; 10 battery cell; 20 housing; 20A upper housing; 20B lower housing; 1 housing; 2 busbar; 11 first housing wall; 12 accommodation space; 111 first recess; 112 second recess; 30 first electrode terminal assembly; 31 first electrode terminal; 311 first terminal plate; 312 first terminal plate; 313 first connecting column; 314 first protrusion; 315 first recess; 3151 first step; 3152 second step; 316 terminal seal; 317 second recess; 3171 first 3. Step portion; 3172. Fourth step portion; 32. Second electrode terminal; 321. Second terminal plate; 322. Second terminal plate; 323. Second connecting column; 325. Third connecting column; 327. Second protrusion; 51. First main body; 52. Second main body; 61. First extension portion; 62. Second extension portion; 7. Electrode assembly; 71. First pole ear; 72. Second pole ear; 81. First insulating member; 81. First covering portion; 82. Second insulating member; 82. Second covering portion; 91. First overlapping portion; 93. Connecting area; 111. Boss; 111. Accommodating portion; 2000. Energy storage device; 400. Electrical compartment. DETAILED DESCRIPTION

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0136] 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.

[0137] 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.

[0138] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical terms "parallel" and "perpendicular" are both allowed to have a certain degree of tolerance and / or error, including the situations of being approximately parallel and approximately perpendicular.

[0139] Below, this application is described in detail.

[0140] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as in aerospace and other fields.

[0141] As the industry's requirements for battery volume utilization and lightweight continue to increase, the outer shell of the battery cell tends to be larger and thinner. In this case, the outer shell of the battery cell tends to be insufficient in strength and prone to bending and deformation. In the related art, the electrode terminals are set larger or compactly arranged in order to use the electrode terminals to improve the strength of the outer shell of the battery cell. However, in the case where the electrode terminal includes a longer extended portion, even if the electrode terminal is fixedly connected to the shell wall or top cover in the outer shell of the battery cell, it is easy to bend or warp locally. Moreover, since the busbar is connected to the electrode terminal, there is a situation where the busbar pulls the electrode terminal due to battery vibration and other reasons, which sometimes causes the electrode terminal to deform or break. Therefore, how to improve the bending strength of the electrode terminal and the outer shell of the battery cell is one of the issues to be solved.

[0142] After research, it is found that if a limiting structure can be set for the part of the electrode terminal that is easy to bend or warp, the bending of the electrode terminal can be prevented to a certain extent. If the two electrode terminals are arranged compactly and the two electrode terminals are mutually supporting structures, and one electrode terminal is used to limit the part of the other electrode terminal that is easy to bend or warp, the local warping of the electrode terminal can be prevented to a certain extent, the bending strength of the electrode terminal can be improved, and the bending strength of the electrode terminal setting area in the battery cell shell can be improved.

[0143] Based on such technical concept, the present application provides a battery cell, which includes a shell, an electrode assembly, a first electrode terminal assembly, and a second electrode terminal; the shell has a accommodating space, and the shell includes a first shell wall; the electrode assembly is at least partially arranged in the accommodating space; the first electrode terminal assembly is arranged on the first shell wall; the second electrode terminal is arranged on the first shell wall; wherein, along the wall thickness direction of the first shell wall, at least part of the second electrode terminal is arranged between the first electrode terminal assembly and the first shell wall, and the first electrode terminal assembly abuts against the second electrode terminal.

[0144] Since the second electrode terminal is at least partially arranged between the first electrode terminal assembly and the first shell wall, and the first electrode terminal assembly abuts against the second electrode terminal, the ability of the first electrode terminal assembly to support and fix the second electrode terminal can be increased, and the ability of the electrode terminal to resist bending and deformation can be improved; and the strength of the area where the electrode terminal is arranged in the first shell wall can be strengthened.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] For the convenience of description, the electric device of one embodiment of the present application is taken as a vehicle 1000 as an example for description. The following is a description with reference to the accompanying drawings.

[0150] Figure 1 The schematic diagram of the structure of the vehicle provided in some embodiments of the present application. 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, etc. Figure 1 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.

[0151] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0152] Figure 2 A schematic diagram of the structural decomposition of a battery provided in some embodiments of the present application. Figure 2As shown, the battery 100 includes a case 20 , which can be divided into an upper case 20A and a lower case 20B. The upper case 20A and the lower case 20B are matched with each other to form a space for arranging the battery cells 10 therebetween.

[0153] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 10 is placed in the layout space defined by the upper case 20A and the lower case 20B. Of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 10 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the layout space defined by the upper case 20A and the lower case 20B. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar ( Figure 2 ), which is used to realize electrical connection between multiple battery cells 10.

[0154] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0155] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0156] Next, combine Figures 3 to 25 Some embodiments of the present application are described in detail.

[0157] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application; Figure 4 A three-dimensional schematic diagram of a battery cell provided for some embodiments of the present application; Figure 5 for Figure 4 A partial enlarged schematic diagram of part A; Figure 6 A schematic top view of a battery cell provided for some embodiments of the present application; Figure 7 For along Figure 6 A schematic cross-sectional view of the middle BB; Figure 8 for Figure 7 A partial enlarged schematic diagram of part C in the middle; Fig. 9 It is a cross-sectional schematic diagram of other embodiments of the present application; Fig.10 for Fig. 9 A partial enlarged schematic diagram of the C1 part;

[0158] Fig.11for Fig. 9 A partial enlarged schematic diagram of the C2 part; Fig.12 is a cross-sectional schematic diagram of yet another embodiment of the present application; Fig.13 for Fig.12 A partial enlarged schematic diagram of the C3 part; Fig.14 A schematic top view of a battery cell provided in another embodiment of the present application; Fig.15 A schematic top view of a battery cell provided in yet another embodiment of the present application; Fig.16 A three-dimensional schematic diagram of a battery cell provided in yet another embodiment of the present application;

[0159] Fig.17 for Fig.16 A partial enlarged schematic diagram of part D in the middle; Fig.18 A schematic top view of a battery cell provided in yet another embodiment of the present application; Fig.19 For along Fig.18 Schematic cross-sectional view of EE; Fig. 20 for Fig.19 A partial enlarged schematic diagram of part F in the middle; Fig.21 A schematic diagram of the structure of a first shell wall provided in some embodiments of the present application; Fig. 22 A schematic diagram of a structure in which a plurality of battery cells are grouped according to some embodiments of the present application;

[0160] Fig.23 An exploded schematic diagram of an electrode connection terminal provided in some embodiments of the present application; Fig.24 A schematic top view of a battery cell provided in some embodiments of the present application; Fig.25 Another schematic top view of a battery cell provided in some embodiments of the present application; Fig.28 for Fig.14 Schematic cross-sectional view of middle GG; Fig.29 for Fig.28 A partial enlarged schematic diagram of part H in the middle.

[0161] In the description of the embodiments of the present application, for the convenience of explanation, the direction of the arrow X represents the "length direction of the battery cell" and the "length direction of the first shell wall", the direction of the arrow Y represents the "thickness direction of the battery cell" and the "width direction of the first shell wall", and the direction of the arrow Z represents the "height direction of the battery cell" and the "thickness direction of the first shell wall".

[0162] A first aspect of the present application provides a battery cell, such as Figures 3 to 20As shown, the battery cell 10 includes: a shell 1, having a accommodating space 12, the shell 1 includes a first shell wall 11; an electrode assembly 7, at least partially disposed in the accommodating space 12; a first electrode terminal assembly 30, disposed on the first shell wall 11; a second electrode terminal 32, disposed on the first shell wall 11; wherein, along the wall thickness direction Z of the first shell wall, the second electrode terminal 32 is at least partially disposed between the first electrode terminal assembly 30 and the first shell wall 11, and the first electrode terminal assembly 30 abuts against the second electrode terminal 32.

[0163] In some embodiments, Figure 3 As shown, the battery cell 10 includes an electrode assembly 7. The electrode assembly 7 includes a positive electrode sheet, a negative electrode sheet, and a separator. 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 electrode sheet and the negative electrode sheet, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through. Figure 3 In the embodiment shown, as the electrode assembly 7, two stacked winding bodies formed by stacking and winding the positive electrode sheet, the negative electrode sheet and the separator are shown, but the electrode assembly 7 is not limited to Figure 3 The winding type shown may also be a laminated type or other structural forms, for example.

[0164] The electrode assembly 7 is provided with a tab, which can lead the current out of the electrode assembly 7. The tab includes a positive tab and a negative tab. Figure 3 In the specific embodiment shown, the electrode assembly 7 has a first pole lug 71 and a second pole lug 72, which are arranged on the same side of the electrode assembly 7 along the wall thickness direction Z of the first shell wall and are arranged near one end of the electrode assembly 7 along the length direction X of the first shell wall. Of course, the first pole lug 71 and the second pole lug 72 can also be arranged on opposite sides of the electrode assembly 7; the first pole lug 71 and the second pole lug 72 can also be respectively arranged near the two ends of the electrode assembly 7 along the length direction X of the first shell wall.

[0165] In some embodiments, the battery cell 10 includes a housing 1. The housing 1 is used to encapsulate the electrode assembly 7 and the electrolyte and other components. The housing 1 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film.

[0166] In some embodiments, the outer shell can be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the outer shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag can be a bag-shaped insulating member or an aluminum-plastic film. As an example, the battery cells can be cylindrical battery cells, prismatic battery cells, soft-pack battery cells or battery cells of other shapes. Prismatic battery cells include square shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries. Polygonal prismatic batteries are, for example, hexagonal batteries. Figures 3 to 20 In the illustrated embodiment, for ease of description, a square-shell battery cell is taken as an example for description.

[0167] In some embodiments, Figure 3 As shown, the housing 1 includes a plurality of housing walls, a portion of which encloses a space having an opening, and the opening can be closed by another housing wall (e.g., the first housing wall 11) to form a receiving space 12 for receiving materials such as the electrode assembly 7 and electrolyte. The housing 1 may be provided with one or more openings. The housing wall (e.g., the first housing wall 11) that closes the opening may also be configured as a top cover.

[0168] In some embodiments, Figure 3 As shown, the housing 1 is provided with a first electrode terminal assembly 30 and a second electrode terminal 32. The first electrode terminal 31 and the second electrode terminal 32 in the first electrode terminal assembly 30 are both electrically connected to the tabs, and can be directly connected to the tabs or indirectly connected to the tabs through a transition component. For ease of description, in the embodiment of the present application, the housing wall where the first electrode terminal assembly 30 and the second electrode terminal 32 are located is referred to as the first housing wall 11.

[0169] Optionally, the first electrode terminal assembly 30 and the second electrode terminal 32 may have the same polarity or opposite polarity.

[0170] like Figures 4 to 20 As shown, the second electrode terminal 32 is at least partially disposed between the first electrode terminal assembly 30 and the first housing wall 11 .

[0171] Optionally, a portion of the first electrode terminal assembly 30 and a portion of the second electrode terminal 32 can be arranged at different positions along the wall thickness direction Z of the first shell wall and a portion or all of the second electrode terminal 32 is located between the first electrode terminal assembly 30 and the first shell wall 11.

[0172] Optionally, the first electrode terminal assembly 30 and the second electrode terminal 32 are both disposed on the first housing wall 11 , and a portion of the second electrode terminal 32 extends into a gap formed between a portion of the first electrode terminal assembly 30 and the first housing wall 11 .

[0173] The first electrode terminal assembly 30 and the second electrode terminal 32 may be disposed near one end of the first housing wall 11 or may be disposed near one end of the first housing wall 11. Fig.14 As shown, it is arranged at a substantially central position of the first housing wall 11.

[0174] In some embodiments, the first electrode terminal assembly 30 abuts against the second electrode terminal 32. The abutment here includes the situation where the first electrode terminal assembly 30 and the second electrode terminal 32 become abutted due to bending deformation, and also includes the situation where the two have a pre-tightening force in the initial assembly state and become abutted. The second electrode terminal 32 located between the first electrode terminal assembly 30 and the first shell wall 11 abuts against the first electrode terminal assembly 30. Figure 7 In the specific embodiment shown, the surface of the second electrode terminal 32 located between the first electrode terminal assembly 30 and the first shell wall 11 along the wall thickness direction Z of the first shell wall that is away from the first shell wall 11 abuts against the surface of the first electrode terminal assembly 30 along the wall thickness direction Z of the first shell wall that is close to the first shell wall 11.

[0175] For the first electrode terminal assembly and the second electrode terminal arranged in this way, when the second electrode terminal tends to warp relative to the first shell wall 11, the warping is prevented to a certain extent by the limiting effect of the first electrode terminal assembly along the wall thickness direction Z of the first shell wall.

[0176] Therefore, since the second electrode terminal 32 is at least partially arranged between the first electrode terminal assembly 30 and the first shell wall 11, and the first electrode terminal assembly 30 abuts against the second electrode terminal 32, the ability of the first electrode terminal assembly 30 to support and fix the second electrode terminal 32 can be improved, and the ability of each electrode terminal to resist bending and deformation can be improved; and the strength of the area where the electrode terminal is set in the first shell wall 11 can also be strengthened.

[0177] In some embodiments, Figures 3 to 13 , Figures 16 to 21 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 .

[0178] 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.

[0179] exist Figures 7 to 11 , Fig.19 and Fig. 20In the specific embodiment shown, the surface of the second electrode terminal 32 located between the first insulating member 81 and the first shell wall 11 along the wall thickness direction Z of the first shell wall that is away from the first shell wall 11 abuts against the surface of the first insulating member 81 along the wall thickness direction Z of the first shell wall that is close to the first shell wall 11.

[0180] exist Fig.12 and Fig.13 In the specific embodiment shown, the first insulating member 81 is not between the first electrode terminal 31 and the second electrode terminal 32, that is, the first electrode terminal 31 is not pressed on the side of the first insulating member 81 away from the first housing wall 11. The side of the first insulating member 81 facing the first housing wall 11 abuts against the side of the second electrode terminal 32 away from the first housing wall 11, that is, the bending deformation of the second electrode terminal 32 is limited by a part of the first insulating member 81. Here, the first insulating member 81 has a suitable bending strength.

[0181] 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 .

[0182] 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.

[0183] 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.

[0184] The first pole piece and the second pole piece are led out through the pole ears 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 .

[0185] 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.

[0186] 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.

[0187] 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.

[0188] In some embodiments, Figures 7 to 10 , Fig.19 and Fig. 20 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 .

[0189] 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 .

[0190] 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.

[0191] In some embodiments, Figures 3 to 13 , Figures 16 to 20 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 .

[0192] An insulating member may or may not be provided between the second electrode terminal 32 and the first housing wall 11 .

[0193] 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.

[0194] 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.

[0195] 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.

[0196] In some embodiments, Fig.12 and Fig.13 As shown, the first insulating member 81 and the second insulating member 82 are integrally formed.

[0197] 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.

[0198] 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.

[0199] This can reduce the number of parts and simplify the assembly steps.

[0200] In some embodiments, Figure 8 , Fig. 20 and Fig.21 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 first recess 111 and the second recess 112 , respectively.

[0201] 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.

[0202] One, two or more first recesses 111 and / or second recesses 112 may be formed on the first housing wall 11 .

[0203] 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 (in the direction perpendicular to the wall thickness direction Z of the first shell wall).

[0204] 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.

[0205] In some embodiments, the first recess 111 and the second recess 112 form the same recess.

[0206] Therefore, compared with forming the recessed portions separately, the processing difficulty is small and the processing is quick.

[0207] In some embodiments, Figures 4 to 8 As shown, the first electrode terminal assembly 30 is provided with a first protrusion 314, and the second electrode terminal 32 is provided with a first recess 315. The first protrusion 314 and the first recess 315 at least partially overlap along the wall thickness direction of the first shell wall 11, and the first protrusion 314 and the first recess 315 cooperate with each other.

[0208] The first protrusion 314 includes a structure protruding from a portion of the first electrode terminal 31 in the first electrode terminal assembly 30, and also includes a structure protruding from a portion of the first insulating member 81. Fig.13As shown, when a portion of the first insulating member 81 (e.g., the first covering portion 811) abuts against the second electrode terminal 32 to limit bending deformation, the portion of the first insulating member 81 (e.g., the first covering portion 811) corresponds to the first protruding portion 314. When the first electrode terminal 31 and the first insulating member 81 abut against the second electrode terminal 32 to limit bending deformation, the first protruding portion 314 includes a portion protruding from the second electrode terminal 32 and a portion protruding from the first insulating member 81.

[0209] The first protrusion 314 refers to a portion of the structure extending from the first electrode terminal assembly 30 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 that can accommodate the first protrusion 314. The recess can be formed by a groove or by a step. In the case where the recess is formed by a step, it can include a single step, or two or more steps.

[0210] Therefore, through the cooperation between the first protrusion 314 and the first recessed portion 315, it is convenient to support and fix the second electrode terminal 32 by the first electrode terminal 31, 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 314 is reduced, thereby improving space utilization.

[0211] 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 311, at least a portion of the first terminal plate 311 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 321, the second terminal plate 321 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 311 partially overlaps with the second terminal plate 321, and the first terminal plate 311 directly or indirectly abuts against the second terminal plate 321.

[0212] Thus, a structure for supporting and fixing the first terminal board 311 to the second terminal board 321 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 321 in the direction away from the first housing wall 11; or, a structure for supporting and fixing the second terminal board 321 to the first terminal board 311 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 311 in the direction away from the first housing wall. Accordingly, the bending resistance of this area in the first housing wall 11 is improved.

[0213] 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 311, at least a portion of the first terminal plate is disposed on a side of the first shell wall 11 away from the accommodating space, the first terminal plate includes a first main body 51 and a first extension portion 61 connected to each other, the second electrode terminal 32 includes a second terminal plate 321, the second terminal plate 321 is disposed on a side of the first shell wall 11 away from the accommodating space, the second terminal plate 321 includes a second main body 52 and a second extension portion 62 connected to each other, along the length direction of the first shell wall 11, at least a portion of the first extension portion 61 and at least a portion of the second extension portion 62 are located between the first main body 51 and the second main body 52, and the first extension portion 61 and the second extension portion 62 are arranged along the width direction of the first shell wall 11.

[0214] Thus, the terminal board can be designed to have a main body and an extension, which can stably connect the terminal board to the first housing wall 11, increase the heat dissipation area of ​​the electrode terminal, and increase the connection area and connection reliability between the electrode terminal and the busbar. In addition, since the first extension 61 and the second extension 62 are located between the first main body 51 and the second main body 52 along the length direction of the first housing wall 11, the bending strength of the region where the electrode terminal is arranged in the first housing wall 11 can be strengthened by the cooperation of the two terminal boards.

[0215] In some embodiments, Figure 8 , Fig.10 , Fig. 20 As shown, the first electrode terminal 31 includes a first terminal plate 311, and at least a portion of the first terminal plate 311 is arranged on a side of the first shell wall 11 away from the accommodating space. The second electrode terminal 32 includes a second terminal plate 321, and the second terminal plate 321 is arranged on a side of the first shell wall 11 away from the accommodating space. The first insulating member 81 is fixed to the first terminal plate 311; along the wall thickness direction of the first shell wall 11, the first terminal plate 311, the first insulating member 81 and the second terminal plate 321 partially overlap, and the second terminal plate 321 is partially arranged between the first insulating member 81 and the first shell wall 11, and the first terminal plate 311 abuts against the first insulating member 81.

[0216] Thus, a structure for supporting and fixing the second electrode terminal 32 by the first electrode terminal assembly 30 can be formed on the side of the first housing wall 11 away from the accommodation space, and the bending deformation of the second electrode terminal 32 in a direction away from the first housing wall 11 can be restricted. Accordingly, the bending resistance of this area in the first housing wall 11 is improved.

[0217] In some embodiments, Figure 8 , Fig.11 and Fig. 20As shown, the first electrode terminal 31 includes a first terminal plate 312, at least part of which is disposed on the side of the first housing wall 11 facing the accommodation space, and the second electrode terminal 32 includes a second terminal plate 322, at least part of 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 312 is at least partially disposed between the second terminal plate 322 and the first housing wall 11; or, as shown in FIG. Fig.11 As shown, along the wall thickness direction of the first housing wall 11 , the second terminal plate 322 is at least partially disposed between the first terminal plate 312 and the first housing wall 11 .

[0218] In some embodiments, Figure 8 , Fig.11 and Fig. 20 As shown, the first electrode terminal 31 includes a first terminal plate 311 and a first terminal disc 312 electrically connected to each other, wherein the first terminal plate 311 is located on the side of the first shell wall 11 away from the accommodating space, and the first terminal disc 312 is located on the side of the first shell wall 11 facing the accommodating space, and the second electrode terminal 32 includes a second terminal plate 321 and a second terminal disc 322 electrically connected to each other, wherein the second terminal plate 321 is located on the side of the first shell wall 11 away from the accommodating space, and the second terminal disc 322 is located on the 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 311 is at least partially arranged between the second terminal plate 321 and the first shell wall 11.

[0219] The first terminal plate 311 and the second terminal plate 321 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 312 and the second terminal plate 322 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.

[0220] Optionally, the first terminal plate 311, the second terminal plate 321, the first terminal plate 312, and the second terminal plate 322 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.

[0221] Optionally, the first terminal plate 311 , the second terminal plate 321 , the first terminal plate 312 , and the second terminal plate 322 may be fixed to the first housing wall 11 by means of connecting columns or the like.

[0222] As mentioned above, along the wall thickness direction perpendicular to the first housing wall 11, the first terminal plate 311 and the second terminal plate 321 can 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 312 and the second terminal plate 322 can 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.

[0223] 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.

[0224] In some embodiments, Figure 3 As shown, the electrode assembly 7 has a first pole piece and a second pole piece, which lead out a first pole ear 71 and a second pole ear 72 respectively. The polarities of the first pole ear 71 and the second pole ear 72 are opposite, and the polarities of the first electrode terminal 31 and the second electrode terminal 32 are the same.

[0225] One of the first pole tab 71 and the second pole tab 72 may be a positive pole tab, and the other may be a negative pole tab. The first electrode terminal 31 and the second electrode terminal 32 may both be connected to the first pole tab 71, so as to have the same polarity as the first pole tab 71; the first electrode terminal 31 and the second electrode terminal 32 may both be connected to the second pole tab 72, so as to have the same polarity as the second pole tab 72.

[0226] Thus, the first electrode terminal 31 and the second electrode terminal 32 can have the same polarity according to circumstances, so that the electrode terminals can be flexibly arranged on the outer shell of the battery cell 10 according to needs.

[0227] In some embodiments, the first terminal plate 312 of the first electrode terminal 31 and the second terminal plate 322 of the second electrode terminal 32 are electrically connected to the same electrode tab of the first electrode tab 71 and the second electrode tab 72 .

[0228] Optionally, the first electrode terminal 31 and the second electrode terminal 32 may be directly connected to the first electrode tab 71, or may be connected to the first electrode tab 71 through a transition component. Optionally, the first electrode terminal 31 and the second electrode terminal 32 may be directly connected to the second electrode tab 72, or may be connected to the second electrode tab 72 through a transition component.

[0229] Thus, the polarities of the two electrode terminals can be easily made the same, and the connection between the electrode terminals and the tabs can be stable and reliable.

[0230] In some embodiments, Figures 4 to 8 As shown, the first electrode terminal assembly 30 is provided with a first protrusion 314, and the second electrode terminal 32 is provided with a first recess 315. The first protrusion 314 and the first recess 315 at least partially overlap along the wall thickness direction of the first shell wall 11, and the first protrusion 314 and the first recess 315 cooperate with each other.

[0231] The first protrusion 314 includes a structure protruding from a portion of the first electrode terminal 31 in the first electrode terminal assembly 30, and also includes a structure protruding from a portion of the first insulating member 81. Fig.13 As shown, when a portion of the first insulating member 81 (e.g., the first covering portion 811) abuts against the second electrode terminal 32 to limit bending deformation, the portion of the first insulating member 81 (e.g., the first covering portion 811) corresponds to the first protruding portion 314. When the first electrode terminal 31 and the first insulating member 81 abut against the second electrode terminal 32 to limit bending deformation, the first protruding portion 314 includes a portion protruding from the second electrode terminal 32 and a portion protruding from the first insulating member 81.

[0232] The first protrusion 314 refers to a portion of the structure extending from the first electrode terminal assembly 30 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 that can accommodate the first protrusion 314. The recess can be formed by a groove or by a step. In the case where the recess is formed by a step, it can include a single step, or two or more steps.

[0233] 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.

[0234] In addition, due to Fig. 20 The first protrusion 314 and the first recess 315 have the same Figure 8 The first protrusion 314 in the embodiment has a similar structure to the first recess 315, so the structure is omitted. Fig. 20 Illustration and detailed description of the first protrusion and the first recess.

[0235] In some embodiments, Figure 8As shown, 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.

[0236] 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 .

[0237] The first step portion 3151 is formed by a portion of the second terminal plate 321 that becomes lower toward a side away from the first housing wall 11 along the wall thickness direction of the first housing wall 11. Fig.13 The portion of the second terminal plate 321 in the dotted line frame on the left side. 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.

[0238] 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 .

[0239] 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.

[0240] like Figure 7 and Figure 8 As shown, in 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.

[0241] 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.

[0242] 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.

[0243] because Fig.15 The step portion and the first covering portion have Figure 8 The step portion and the first covering portion in the embodiment are similar in structure, so the Fig.15 Illustration of the middle step portion and the first covering portion.

[0244] 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 first covering portion 811 does not occupy additional space, thereby improving the space utilization.

[0245] In some embodiments, Figure 7 and Figure 8 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 311 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 first covering portion on the side facing away from the first shell wall does not exceed the surface of the second terminal plate 321 on the side facing away from the first shell wall 11.

[0246] 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 311 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 321 on the side facing away from the first housing wall 11. In a specific embodiment, the surface of the first covering portion 811 on the side facing away from the first housing wall 11 is roughly flush with the surface of the first terminal plate 311 on the side facing away from the first housing wall, and the surface of the second terminal plate 321 on the side facing away from the first housing wall 11. Here, roughly flush means that there is no obvious step difference.

[0247] 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 311 and / or the second terminal plate 321 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 311 and the second terminal plate 321 are reliably connected. In some embodiments, such as Figure 6 As shown, the first terminal plate 311 includes a first main body portion 51 and a first extension portion 61 connected to each other, and the second terminal plate 321 includes a second main body portion 52 and a second extension portion 62 connected to each other, and along the length direction X of the first shell wall, at least a portion of the first extension portion 61 and at least a portion of the second extension portion 62 are located between the first main body portion 51 and the second main body portion 52.

[0248] In some embodiments, along the wall thickness direction Z of the first shell wall, the height between the surface of the first terminal plate 311 facing away from the shell wall and the surface of the second terminal plate 321 facing away from the first shell wall is greater than or equal to 0 and does not exceed 0.5 mm.

[0249] As a result, the first terminal plate 311 and the second terminal plate 321 are almost flush, which helps to share external pressure and improve the anti-deformation ability.

[0250] In some embodiments, the first terminal plate 311 includes a first main body portion 51 and a first extension portion 61 connected to each other, and the second terminal plate 321 includes a second main body portion 52 and a second extension portion 62 connected to each other, along the length X of the first shell wall, at least a portion of the first extension portion 61 and at least a portion of the second extension portion 62 are located between the first main body portion 51 and the second main body portion 52, and the first extension portion 61 and the second extension portion 62 are arranged along the width direction Y of the first shell wall.

[0251] The first terminal plate 311 includes a first main body portion 51. Figure 6In the figure, the portion of the first terminal plate 311 in the dotted line frame serves as the first main body 51 , and the remaining portion of the first terminal plate 311 (excluding the protruding portion) serves as the first extension 61 . Similarly, the second terminal plate 321 includes a second main body 52 and a second extension 62 .

[0252] exist Figure 6 In the specific example shown, the first main body 51 and the second main body 52 are formed into a generally rectangular shape and the long sides extend along the width direction Y of the first housing wall, and the first main body 51 and the second main body 52 are arranged along the length direction X of the first housing wall. The first extension portion 61 and the second extension portion 62 are formed into a generally rectangular shape and the long sides extend along the length direction X of the first housing wall, and the first extension portion 61 and the second extension portion 62 are arranged along the width direction Y of the first housing wall. Thus, along the length direction X of the first housing wall, the first extension portion 61 and the second extension portion 62 are located between the first main body 51 and the second main body 52.

[0253] certainly, Figure 6 The figure is only a specific embodiment. The shapes and arrangement positions of the first main body 51, the first extension 61, the second main body 52, and the second extension 62 are not limited to Figure 6 The embodiment shown.

[0254] In addition, Figure 6 In the specific embodiment shown in the figure, 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 extension 62 is relatively close, and the distance between the second main body 52 and the first extension 61 is relatively close. Fig.10 As shown, the distance between the first main body portion 51 and the second extension portion 62 is relatively large, and the distance between the second main body portion 52 and the first extension portion 61 is relatively large.

[0255] Furthermore, in Figure 6 In the specific embodiment shown, along the width direction Y of the first housing wall, the second main body portion 52 is substantially flush with the outer edge of the first extension portion 61 (the edge close to the long side of the first housing wall 11), and the outer edge of the first main body portion 51 is substantially flush with the outer edge of the second extension portion 62 (the edge close to the long side of the first housing wall 11). However, they may not be flush. Optionally, one of the outer edge of the second main body portion 52 and the outer edge of the first extension portion 61 is closer to the long side of the first housing wall 11, and / or one of the outer edge of the first main body portion 51 and the outer edge of the second extension portion 62 is closer to the long side of the first housing wall 11.

[0256] Thus, the terminal board can be designed to have a main body and an extension, which can stably connect the terminal board to the first housing wall 11, increase the heat dissipation area of ​​the electrode terminal, and increase the connection area and connection reliability between the electrode terminal and the busbar. In addition, since the first extension 61 and the second extension 62 are located between the first main body 51 and the second main body 52 along the length direction X of the first housing wall, the bending strength of the region where the electrode terminal is arranged in the first housing wall 11 can be strengthened by the cooperation of the two terminal boards.

[0257] In some embodiments, along the width direction Y of the first housing wall, the first extension portion 61 and the second extension portion 62 have a first overlapping portion.

[0258] Thus, by arranging the first extension portion 61 and the second extension portion 62 to overlap in the width direction Y of the first housing wall, the synergistic effect of the two electrode terminals can be used to improve the bending strength of the region in the first housing wall where the electrode terminals are arranged. Moreover, the first electrode terminal assembly and the second electrode terminal can be arranged as compactly as possible, which is beneficial to the utilization of the non-electrode terminal arrangement region of the first housing wall, and further beneficial to improving the volume utilization of the battery pack.

[0259] In some embodiments, the material of the first main body portion 51 and / or the second main body portion 52 is different from the material of the first overlapping portion.

[0260] In this way, the materials of the first main body 51 and the second main body 52 can be set according to the situation, which helps to reduce current loss, improve heat dissipation capacity, etc.

[0261] In some embodiments, Figures 6 to 8 As shown, the first electrode terminal also includes a first terminal disc, at least a portion of which is disposed on a side of the first shell wall facing the accommodating space, and the second electrode terminal also includes a second terminal disc, at least a portion of which is disposed on a side of the first shell wall facing the accommodating space, and the first main body portion 51 and the first terminal disc 312 are directly connected via the first connecting column 313; the second main body portion 52 and the second terminal disc 322 are directly connected via the second connecting column 323.

[0262] The first connection column 313 can be connected to the first body portion 51 or the first terminal plate 312 by means of threaded connection, welding, riveting, etc., or can be formed as one body with the first body portion 51 or the first terminal plate 312. The second connection column 323 can be connected similarly to the first connection column 313, so the first connection column 313 is described in detail here, and the detailed description of the second connection column 323 is omitted.

[0263] In some embodiments, Figure 8As shown, the first connecting column 313 is formed as a whole with the first terminal plate 312 and extends perpendicularly relative to the plate surface of the first terminal plate 312. A through hole is formed in the first main body 51 in the first terminal plate 311, and the first connecting column 313 is inserted into the through hole and fixedly connected to the first main body 51. Thus, the first electrode terminal 31 can be assembled to the first housing wall 11. In addition, a terminal seal 316 can be further assembled between the first connecting column 313 and the first main body 51.

[0264] Since the terminal plate and the terminal disk can be connected together through the connecting column, they can function as electrode terminals to draw current from the electrode assembly. Moreover, the connecting column is provided in the main body, so that the electrode terminal can be reliably fixed to the first housing wall 11 in the main body.

[0265] In some embodiments, the first recessed portion 315 is disposed on a side of the second extension portion 62 facing the first electrode terminal 31 , and the first protruding portion 314 is disposed on a side of the first body portion 51 facing the second electrode terminal 32 .

[0266] The first main body 51 is fixedly connected to the first housing wall 11 through the first connecting column 313, so the first main body 51 is firmly connected to the first housing wall 11. Moreover, compared with the first extension portion 61, the shape of the first main body 51 is not easy to bend. Therefore, the first protrusion 314 that mainly plays a role in preventing warping is provided on the first main body 51, and the first recessed portion 315 is provided on the second extension portion 62 that is prone to warping. The first recessed portion 315 is located between the first protrusion 314 and the first housing wall 11. Therefore, the first protrusion 314 prevents the first recessed portion 315 and the second extension portion 62 from warping in a direction away from the first housing wall 11 to a certain extent.

[0267] Thus, the first recessed portion 315 provided on the second extension portion 62 can be abutted by the first protruding portion 314 provided on the first main body portion 51 and fixed between the first protruding portion 314 and the first housing wall 11, thereby preventing the second extension portion 62 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 second extension portion 62 and the entire second electrode terminal 32. 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.

[0268] Regarding the first extension portion 61 , one end thereof extending away from the first main body portion 51 may be fixed to the first housing wall 11 via a third connecting column 325 .

[0269] exist Figures 4 to 8In the illustrated embodiment, only one protrusion and recess that cooperate with each other is provided, but more protrusions and recesses may also be provided.

[0270] In some embodiments, Fig.14 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 extension 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.

[0271] 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.

[0272] 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.

[0273] Thus, the second recessed portion 317 provided on the first extension 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 extension portion 61 from tilting in a direction away from the first housing wall 11 due to its longer extension to a certain extent, thereby improving the bending strength of the first extension 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 extension portion 61 is not fixed to the first housing wall 11 by rivets, connecting columns, etc., the first extension 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.

[0274] The recessed portion and the protruding portion may be disposed not only between the main body portion and the extending portion, but also between the two extending portions.

[0275] In some embodiments, Fig.14 , Fig.28 and Fig.29As 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.

[0276] The third step portion 3171 is formed by a portion of the first terminal plate 311 that becomes lower toward a 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 311 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 .

[0277] 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.

[0278] In some embodiments, Fig.15 As shown, the first extension portion 61 is connected to the first terminal plate 312 , the recessed portion is arranged on the side of the second extension portion 62 facing the first electrode terminal 31 , and the protruding portion is arranged on the side of the first extension portion 61 facing the second electrode terminal 32 .

[0279] Fig.15 The protrusions and depressions in the illustrated embodiment may be formed in the same manner as Figure 8 The protrusions and recesses in the illustrated embodiment have similar matching structures, and detailed description thereof is omitted here.

[0280] Thus, a structure in which a protrusion and a recessed portion cooperate can also be formed between the two extension portions, and the recessed portion of the second extension portion 62 can be pressed onto the first shell wall 11 by utilizing the protrusion of the first extension portion 61 fixed to the first shell wall 11, thereby achieving mutual support of the two electrode terminals, which is beneficial to improving the bending strength of the electrode terminals.

[0281] In some embodiments, along the wall thickness direction of the first shell wall 11, the overlapping portion of the first electrode terminal assembly 30 and the second electrode terminal 32 is the overlapping area, the length of the overlapping area along the width direction of the first shell wall is W11, the length of the first shell wall 11 along the width direction of the first shell wall is W, W11 is in the range of 10% to 90% of W, the length direction X of the first shell wall is the length direction of the first shell wall 11, and the width direction Y of the first shell wall is the width direction of the first shell wall 11.

[0282] The overlapping region means that the second electrode terminal 32 is located between the first electrode terminal assembly 30 and the first housing wall 11 so that the second electrode terminal 32 and the first electrode terminal assembly 30 form an overlapping region along the wall thickness direction of the first housing wall 11. Fig.24 In FIG. 1 , W11 represents the length of the overlapping region along the width direction Y of the first shell wall.

[0283] The length of the first housing wall 11 along the width direction Y of the first housing wall refers to the largest dimension of the length of the outer contour of the first housing wall 11 along the width direction of the first housing wall. Fig.19 In FIG. 1 , W represents the length of the first housing wall 11 along the width direction Y of the first housing wall.

[0284] The length W11 of the overlapping area along the width direction of the first shell wall may account for 10% to 90% of the length W of the first shell wall 11 along the width direction of the first shell wall, that is, W11 / W is between 10% and 90%. For example, it may account for 10%, 15%, 20%, 30%, 50%, 70%, 90%, and of course, it may also be other values ​​within the above range.

[0285] In this way, the first shell wall 11 can be fully utilized along the width direction Y of the first shell wall, and the supporting force between the first electrode terminal assembly 30 and the second electrode terminal 32 can be effectively improved, the bending strength of the electrode terminal can be improved, and the strength of the first shell wall around the electrode terminal can be strengthened.

[0286] In some embodiments, a length W11 of the overlapping region along the width direction Y of the first housing wall is in a range of 0.5 mm to 50 mm.

[0287] Exemplarily, the length W11 of the overlapping area along the width direction Y of the first shell wall can be 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 15mm, 20mm, 30mm, 40mm, 50mm. Of course, it can also be other values ​​in the range of 0.5mm to 50mm.

[0288] Therefore, the length W11 of the overlapping area along the width direction of the first shell wall can be determined according to the length W of the first shell wall along the width direction of the first shell wall, and by setting the length W11 of the overlapping area along the width direction of the first shell wall to be larger, the supporting force between the first electrode terminal assembly 30 and the second electrode terminal 32 can be improved, the bending strength of the electrode terminal can be improved, and the strength of the first shell wall around the electrode terminal can be strengthened.

[0289] In some embodiments, Figure 8 As shown, the length L11 of the overlapping region along the length direction X of the first housing wall is in the range of 0.5 mm to 6 mm.

[0290] For example, the length L11 of the overlapping area along the length direction X of the first shell wall may be 0.5 mm, 1 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, or 6 mm, or other values ​​within the range of 0.5 mm to 6 mm.

[0291] Therefore, by setting the length L11 of the overlapping area along the length direction of the first shell wall to be smaller, the matching strength between the protrusion and the recess can be improved, and it is also beneficial to reduce the overall size of the first electrode terminal assembly 30 and the second electrode terminal 32.

[0292] In some embodiments, along the width direction Y of the first housing wall, the first extension portion 61 and the second extension portion 62 have a first overlapping portion 91 , and the width direction Y of the first housing wall is the width direction of the first housing wall 11 .

[0293] like Fig.24 As shown in the figure, along the width direction Y of the first housing wall, the first extension portion 61 and the second extension portion 62 have a portion overlapping each other, that is, the portion of the first extension portion 61 and the second extension portion 62 respectively located in the dotted frame in the figure, and this portion is called a first overlapping portion 91. Here, the first overlapping portion 91 is not necessarily a portion where the first extension portion 61 and the second extension portion 62 overlap and contact, and includes a situation where the first extension portion 61 and the second extension portion 62 are projected onto the same projection plane along the width direction Y of the first housing wall, and their respective projections partially or completely overlap.

[0294] Thus, by arranging the first extension portion 61 and the second extension portion 62 to overlap in the width direction Y of the first housing wall, the synergistic effect of the two electrode terminals can be used to improve the bending strength of the region where the electrode terminals are arranged in the first housing wall 11. 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 arrangement region of the first housing wall 11, and further beneficial to improving the volume utilization of the battery pack.

[0295] In some embodiments, Fig.24 As shown, the dimension of the first main body portion 51 along the width direction Y of the first shell wall is B1, the dimension of the first extension portion along the width direction Y of the first shell wall is W1, and B1 is greater than or equal to W1; and / or, the dimension of the second main body portion 52 along the width direction Y of the first shell wall is B2, the dimension of the second extension portion along the width direction Y of the first shell wall is W2, and B2 is greater than or equal to W2.

[0296] Optionally, a dimension B1 of the first main body portion 51 along the width direction Y of the first shell wall is greater than or equal to a dimension W1 of the first extension portion along the width direction Y of the first shell wall.

[0297] When the dimension B1 of the first main body 51 along the width direction Y of the first housing wall is equal to the dimension W1 of the first extension along the width direction Y of the first housing wall, the first terminal plate 311 can be configured as a rectangular thin plate of equal width. In this case, the portion where the first connecting column 313 is installed is the first main body, and the remaining portion is the first extension.

[0298] Optionally, a dimension B2 of the second main body portion 52 along the width direction Y of the first shell wall is greater than a dimension W2 of the second extension portion along the width direction Y of the first shell wall or is equal to a dimension W2 of the second extension portion along the width direction Y of the first shell wall.

[0299] When the dimension B2 of the second main body 52 along the width direction Y of the first housing wall is equal to the dimension W2 of the second extension 62 along the width direction Y of the first housing wall, the second terminal plate 321 can be configured as a rectangular thin plate of equal width. In this case, the portion where the second connecting column 323 is installed is the second main body 52, and the remaining portion is the second extension 62.

[0300] Thus, the degree of freedom in setting the shape of the electrode terminal can be increased, and the electrode terminal can be appropriately set according to the size of the first shell wall 11 (especially the size along the width direction Y of the first shell wall), which is also conducive to the compact arrangement of the two electrode terminals. Moreover, setting the first main body 51 and the second main body 52 larger is conducive to installing the connecting column on the first main body 51 and the second main body 52, which is conducive to improving the installation stability of the electrode terminal relative to the first shell wall. Setting the width of the first extension part 61 and the second extension part 62 along the width direction Y of the first shell wall smaller is conducive to reducing the weight of the electrode terminal and even the battery cell and battery pack. Moreover, the first extension part 61 and the second extension part 62 can also be used to form a bottleneck of the current flow, thereby eliminating the process of separately processing the bottleneck of the current flow.

[0301] In some embodiments, along the width direction Y of the first shell wall, the first extension 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 extension portion 62 is offset relative to the center position of the second main body portion 52.

[0302] like Fig.25 As shown, the position of the dotted line O represents the center position of the first main body 51 along the width direction Y of the first housing wall, the dotted line O1 represents the center position of the first extension 61 along the width direction Y of the first housing wall, and the dotted line O2 represents the center position of the second extension 62 along the width direction Y of the first housing wall. The offset distance may be 15% to 27% of the width of the first housing wall 11.

[0303] Thus, the dimension of the first shell wall along the width direction of the first shell wall can be fully utilized to arrange the first extension part and the second extension part along the width direction of the first shell wall, which is beneficial for compactly arranging the first electrode terminal and the second electrode terminal.

[0304] In some embodiments, Fig.24 As shown, the dimension of the first shell wall 11 along the dimension direction X of the first shell wall is L, and the dimension of the first overlapping part along the dimension direction of the first shell wall is A, and A is in the range of 10% to 40% of L.

[0305] The dimension of the first housing wall 11 along the dimension direction X of the first housing wall refers to the maximum dimension of the outer contour of the first housing wall 11 along the dimension direction X of the first housing wall. A can be 10%, 20%, 25%, 30%, 35%, 40% of L.

[0306] Therefore, setting the first overlapping portion to be longer is beneficial to improving the strength of the electrode terminal arrangement area in the first shell wall and even the entire first shell wall.

[0307] In some embodiments, a length A of the first overlapping portion along the length direction of the first housing wall is in a range of 3 mm to 50 mm.

[0308] For example, A may be 3 mm, 5 mm, 8 mm, 10 mm, 15 mm, 20 mm, 30 mm, 40 mm, or 50 mm, or may be other length values ​​within the above range.

[0309] Therefore, setting the first overlapping portion to be longer is beneficial to improving the strength of the electrode terminal arrangement area in the first shell wall and even the entire first shell wall.

[0310] In some embodiments, along the length direction X of the first housing wall, the first body portion 51 and the second body portion 52 have a second overlapping portion.

[0311] Along the length direction X of the first housing wall, the first main body 51 and the second main body 52 have an overlapping portion that overlaps each other, and this portion is referred to as a second overlapping portion. Here, the second overlapping portion is not necessarily a portion where the first main body 51 and the second main body 52 overlap and contact, and includes a situation where the first main body 51 and the second main body 52 are projected onto the same projection plane along the length direction X of the first housing wall, and their respective projections partially or completely overlap.

[0312] Therefore, since there are overlapping parts in the length direction of the first shell wall and the width direction of the first shell wall, the first electrode terminal 31 and the second electrode terminal 32 can be compactly arranged in the length direction of the first shell wall and the width direction of the first shell wall, and the bending strength of the first shell wall can be further improved.

[0313] In some embodiments, Fig.24 and Fig.25 , the dimension of the first shell wall along the width direction Y of the first shell wall is W, the dimension of the second overlapping part along the width direction of the first shell wall is B, and B is in the range of 20% to 90% of W.

[0314] The dimension of the first housing wall 11 along the width direction Y of the first housing wall refers to the maximum dimension of the outer contour of the first housing wall 11 along the width direction Y of the first housing wall. B may be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 60%, 70%, 75%, 80%, 90% of L. It may also be a ratio within the above range.

[0315] Therefore, the length dimension of the second overlapping area along the width direction of the first shell wall is set to be longer, which is beneficial to enhancing the strength of the first shell wall.

[0316] In some embodiments, 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 31 and the second electrode terminal 32 is greater than or equal to 0.3 mm.

[0317] Here, the closest distance between the first electrode terminal 31 and the second electrode terminal 32 refers to the distance between the parts of the first electrode terminal 31 and the second electrode terminal 32 that are closest to each other. The closest distance is greater than or equal to 0.3 mm, for example, it can be 0.3 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, etc. It is generally believed that when there is an insulating member between the parts of the first electrode terminal 31 and the second electrode terminal 32 that are close to each other, it can be considered to be arranged closer, for example, the closest distance can be set to 0.3 mm or greater. When there is no insulating member between the parts of the first electrode terminal 31 and the second electrode terminal 32 that are close to each other, it is considered to be arranged slightly farther, for example, the closest distance can be set to 2 mm or greater.

[0318] This can reduce the possibility of the first electrode terminal and the second electrode terminal being short-circuited with each other.

[0319] In some embodiments, Fig. 22 and Fig.25 As shown, the first electrode terminal 31 and the second electrode terminal 32 both include a connection area 93 for connecting to the busbar 2. The busbar 2 is used to electrically connect the plurality of battery cells 10 to each other. The connection area 93 is formed at least in the first overlapping portion 91 (see Fig.24 ).

[0320] Here, the connection area 93 (at Fig.25 The area indicated by the oblique lines in the figure is the surface area of ​​the first electrode terminal 31 and the second electrode terminal 32 connected to the busbar 2. The connection here includes welding, which can be ultrasonic welding, laser welding or other suitable welding methods.

[0321] exist Fig. 22 In the specific embodiment shown, the collector 2 is configured as a rectangular thin plate, but is not limited to a rectangle and may be other suitable shapes. In addition, it is not limited to a plate shape and may be other suitable three-dimensional shapes.

[0322] Thus, the busbar 2 is connected to the portion where the first overlapping portion is formed in the first electrode terminal 31 and the second electrode terminal 32. Since this portion has a strong bending strength, even if the busbar causes bending stress to act on the first electrode terminal, the second electrode terminal, and the first shell wall, the first electrode terminal, the second electrode terminal, and the first shell wall are not easily bent and deformed, and are less likely to break due to bending deformation.

[0323] In some embodiments, Fig.25 As shown, the connection area is also formed in at least one of the first body portion 51 and the second body portion 52 .

[0324] This can further enhance the connection strength between the electrode terminal and the busbar 2 , further disperse the bending stress caused by the busbar 2 , and further improve the deformation resistance of the electrode terminal and the first housing wall 11 .

[0325] In some embodiments, the material of the first main body portion 51 and / or the second main body portion 52 is different from the material of the first overlapping portion 91 .

[0326] For example, one of them may be made of aluminum and the other may be made of copper. In some specific embodiments, for example, the material of the first main body 51 on the positive electrode side may be set to a metal material with better thermal conductivity.

[0327] In this way, the materials of the first main body 51 and the second main body 52 can be set according to the situation, which helps to reduce current loss, improve heat dissipation capacity, etc.

[0328] In some embodiments, Fig.24 As shown, 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.

[0329] The length of the first housing wall 11 (which may also be the length of the battery cell 10 ) may be less than or equal to 450 mm, for example, may be 450 mm, 400 mm, 350 mm, 300 mm, 250 mm, etc.

[0330] Therefore, the narrow side walls of the strip-shaped battery cells can be fully utilized to configure the electrode terminals, which improves the flexibility of battery cell grouping and is also beneficial to large-area heat dissipation.

[0331] A second aspect of the present application provides a battery, Fig. 27 A schematic cross-sectional view of a battery with a boss provided in some embodiments of the present application. Figure 2 As shown, the battery 100 includes a housing 20 and at least two battery cells 10 provided in the first aspect of the present application.

[0332] The battery cell 10 may adopt the above embodiments individually or in combination, which will not be described in detail here.

[0333] This can provide a battery in which the strength of the first housing wall in the battery cell is enhanced, which helps to improve the reliability of the battery.

[0334] In some embodiments, Fig. 22 As shown, the battery cells 10 are arranged along the width direction of the first housing wall.

[0335] This is beneficial to improving the volume utilization of the battery.

[0336] In some embodiments, the first electrode terminal assembly 30 includes a first electrode terminal 31, the first electrode terminal 31 includes a first main body portion 51 and a first extension portion 61 connected to each other, and the second electrode terminal 32 includes a second main body portion 52 and a second extension portion 62 connected to each other, along the length direction of the first shell wall, at least a portion of the first extension portion 61 and at least a portion of the second extension portion 62 are located between the first main body portion 51 and the second main body portion 52, and in adjacent battery cells, the first extension portion 61 of one battery cell 10 is arranged along the width direction Y with the second extension portion 62 of another battery cell 10, and are electrically connected through the busbar 2.

[0337] Since the busbar 2 is connected to the first extension portion 61 and the second extension portion 62 located between the first main body portion 51 and the second main body portion 52, the bending resistance of the connection portion is relatively strong. Therefore, the first electrode terminal 31, the second electrode terminal 32 and the first shell wall 11 are not prone to bending, deformation or breakage, thereby improving the reliability of the battery.

[0338] In some embodiments, in the same battery cell 10, along the width direction of the first housing wall, the first extension portion 61 and the second extension portion 62 have a first overlapping portion 91 (see Fig.24 ), in adjacent battery cells 10 , the first overlapping portion 91 of one battery cell is electrically connected to the first overlapping portion 91 of another battery cell through the busbar 2 .

[0339] Thus, the busbar 2 is connected to a portion of the first electrode terminal 31 and the second electrode terminal 32 where the first overlapping portion 91 is formed. Since this portion has a strong bending resistance, even if the busbar 2 causes bending stress to act on the first electrode terminal 31, the second electrode terminal 32, and the first shell wall 11, the first electrode terminal 31, the second electrode terminal 32, and the first shell wall 11 are not easily bent and deformed, and are less likely to break due to bending and deformation, thereby improving the reliability of the battery.

[0340] In some embodiments, Fig. 27 As shown, at least one box wall of the box body 20 has a boss 111a, and the boss 111a is formed by the box wall bulging in the direction away from the battery cell 10. The boss 111a forms a receiving portion 111b on the side facing the battery cell 10. Along the direction perpendicular to the box wall on which the boss 111a is formed, the projections of the first electrode terminal assembly 30 and the second electrode terminal 32 do not exceed the projection of the boss 111a, and the first electrode terminal assembly 30 and / or the second electrode terminal 32 are at least partially received in the receiving portion 111b.

[0341] Thus, only the height of the box body where the first electrode terminal assembly 30, the second electrode terminal 32 and the busbar 2 are located can be increased, thereby reducing the size of the battery and facilitating improving the volume utilization of the battery.

[0342] A third aspect of the present application provides an electrical device, which includes a plurality of battery cells provided in the first aspect or a plurality of batteries provided in the second aspect, and the battery cells or batteries provide power for the electrical device.

[0343] Thus, an electrical device equipped with a battery whose electrode terminals and casing are not prone to bending or have a small degree of bending deformation can be provided, thereby improving the reliability of the electrical device and reducing the maintenance time of the electrical device.

[0344] A fourth aspect of the present application provides an energy storage device, Fig.26 A schematic diagram of the structure of an energy storage device provided for some embodiments of the present application.

[0345] The energy storage device 2000 includes a plurality of battery cells provided in the first aspect, or the battery 100 provided in the second aspect, and the battery cells or the battery 100 are configured to store electrical energy and provide electrical energy.

[0346] In a specific embodiment, Fig.26 As shown, the energy storage device 2000 includes a battery compartment and an electrical compartment 400, and a plurality of batteries 100 are arranged in the battery compartment. The energy storage device 2000 may be an energy storage container or an energy storage electrical cabinet.

[0347] Thus, an energy storage device using a battery whose electrode terminals and casing are not prone to bending or have a small degree of bending deformation can be provided, thereby improving the reliability of the energy storage device and reducing the maintenance time of the energy storage device.

[0348] 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, at least partially disposed in the accommodation space; A first electrode terminal assembly, disposed on the first housing wall; A second electrode terminal is provided on the first housing wall; Wherein, along the wall thickness direction of the first shell wall, at least a portion of the second electrode terminal is disposed between the first electrode terminal assembly and the first shell wall, and the first electrode terminal assembly abuts against the second electrode terminal.

2. The battery cell according to claim 1, characterized in that: The first electrode terminal assembly includes a first electrode terminal and 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.

3. The battery cell according to claim 2, characterized in that: The electrode assembly includes a first pole piece and a second pole piece with opposite polarities, The first electrode terminal is electrically connected to the first pole piece, and the second electrode terminal is electrically connected to the second pole piece.

4. The battery cell according to claim 2, characterized in that: The first insulating member is partially disposed between the first electrode terminal and the first housing wall.

5. The battery cell according to claim 3, characterized in that: The first insulating member is partially disposed between the first electrode terminal and the first housing wall.

6. The battery cell according to claim 2, 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.

7. The battery cell according to claim 6, 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.

8. The battery cell according to claim 7, characterized in that: The first electrode terminal includes a first terminal plate, at least a portion of which is disposed on a side of the first housing wall facing the accommodation space, and the second electrode terminal includes a second terminal plate, at least a portion of which is disposed on a side of the first housing wall facing the accommodation space. Along the wall thickness direction of the first housing wall, the first terminal plate is at least partially arranged between the second terminal plate and the first housing wall; or, Along the wall thickness direction of the first housing wall, the second terminal plate is at least partially arranged between the first terminal plate and the first housing wall.

9. The battery cell according to claim 7, 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.

10. The battery cell according to claim 9, 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 first covering portion provided by the first insulating member. Along the wall thickness direction of the first shell wall, a portion of the second electrode terminal is located between the first covering portion and the first shell wall, and the first covering portion is at least partially accommodated in a step space formed by the second step portion.

11. The battery cell according to claim 10, characterized in that: Along the wall thickness direction of the first housing wall, the surface of the first covering portion on the side facing away from the first housing wall does not exceed the surface of the first terminal plate on the side facing away from the housing wall; and / or, Along the wall thickness direction of the first housing wall, a surface of the first covering portion on a side facing away from the first housing wall does not extend beyond a surface of the second terminal board on a side facing away from the first housing wall.

12. The battery cell according to any one of claims 9 to 11, characterized in that: Along the wall thickness direction of the first shell wall, the height difference between the surface of the first terminal plate facing away from the shell wall and the surface of the second terminal plate facing away from the first shell wall is greater than or equal to 0 and does not exceed 0.5 mm.

13. The battery cell according to any one of claims 9 to 11, characterized in that: The first terminal plate includes a first main body portion and a first extension portion connected to each other, The second terminal plate includes a second main body portion and a second extension portion connected to each other, Along the length direction of the first shell wall, at least part of the first extension portion and at least part of the second extension portion are located between the first main body portion and the second main body portion, and the first extension portion and the second extension portion are arranged along the width direction of the first shell wall.

14. The battery cell according to claim 13, characterized in that: Along the width direction of the first housing wall, the first extending portion and the second extending portion have a first overlapping portion.

15. The battery cell according to claim 14, characterized in that: A material of the first main body portion and / or the second main body portion is different from a material of the first overlapping portion.

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

17. The battery cell according to claim 13, characterized in that: The first recessed portion is disposed on a side of the second extending portion facing the first electrode terminal, and the first protruding portion is disposed on a side of the first main body portion facing the second electrode terminal.

18. The battery cell according to claim 17, characterized in that: The first electrode terminal is further provided with a second recessed portion, and the second electrode terminal is further provided with a second protruding portion, the second protruding portion and the second recessed portion at least partially overlap along the wall thickness direction of the first shell wall, and the second protruding portion and the second recessed portion cooperate with each other. The second recessed portion is disposed on a side of the first extending portion facing the second electrode terminal, and the second protruding portion is disposed on a side of the second main body portion facing the first electrode terminal.

19. The battery cell according to claim 18, 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.

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

21. The battery cell according to any one of claims 2 to 11, characterized in that: The battery cell further includes a second insulating member at least partially located between the second electrode terminal and the first housing wall.

22. The battery cell according to claim 21, characterized in that: The first insulating member and the second insulating member are integrally formed.

23. The battery cell according to claim 21, 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.

24. The battery cell according to claim 23, characterized in that: The first recess and the second recess form the same recess.

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

26. The battery cell according to any one of claims 1 to 6, characterized in that: The first electrode terminal assembly includes a first electrode terminal, the first electrode terminal includes a first terminal plate, at least a portion of the first terminal plate is disposed on a side of the first housing wall away from the accommodation space, The second electrode terminal includes a second terminal plate, and the second terminal plate is arranged on a side of the first housing wall away from the accommodation space. Along the wall thickness direction of the first housing wall, the first terminal plate partially overlaps with the second terminal plate, and the first terminal plate directly or indirectly abuts against the second terminal plate.

27. The battery cell according to any one of claims 1 to 6, characterized in that: The first electrode terminal assembly includes a first electrode terminal, the first electrode terminal includes a first terminal plate, at least a portion of the first terminal plate is disposed on a side of the first housing wall away from the accommodation space, the first terminal plate includes a first main body portion and a first extension portion connected to each other, The second electrode terminal includes a second terminal plate, the second terminal plate is arranged on a side of the first housing wall away from the accommodation space, and the second terminal plate includes a second main body portion and a second extension portion connected to each other. Along the length direction of the first shell wall, at least part of the first extension portion and at least part of the second extension portion are located between the first main body portion and the second main body portion, and the first extension portion and the second extension portion are arranged along the width direction of the first shell wall.

28. The battery cell according to any one of claims 1 to 11, characterized in that: Along the wall thickness direction of the first housing wall, the overlapping portion of the first electrode terminal assembly and the second electrode terminal is an overlapping area. The length of the overlapping area along the width direction of the first shell wall is W11, and the length of the first shell wall along the width direction is W. W11 is in the range of 10% to 90% of W.

29. The battery cell according to claim 28, characterized in that: W11 is in the range of 0.5 mm to 50 mm.

30. The battery cell according to claim 28, characterized in that A length of the overlapping region along the length direction of the first shell wall is L11, and L11 is in the range of 0.5 mm to 6 mm.

31. The battery cell according to claim 13, characterized in that: The dimension of the first main body along the width direction of the first shell wall is B1, the dimension of the first extension along the width direction of the first shell wall is W1, and B1 is greater than or equal to W1; and / or, A dimension of the second main body along the length direction of the first shell wall is B2, a dimension of the second extension portion along the length direction of the first shell wall is W2, and B2 is greater than or equal to W2.

32. The battery cell according to claim 31, characterized in that: Along the wall thickness direction of the first housing wall, the overlapping portion of the first electrode terminal assembly and the second electrode terminal is an overlapping area. The length of the overlapping area along the length direction of the first shell wall is L11, and L11 is in the range of 0.5 mm to 6 mm. A length of the overlapping region along a width direction of the first shell wall is W11, and W11 is in a range of 0.5 mm to 50 mm.

33. The battery cell according to claim 13, characterized in that: Along the width direction of the first shell wall, the first extension portion is offset relative to the center position of the first main body portion; and / or, The second extension portion is offset relative to a center position of the second main body portion along a width direction of the first housing wall.

34. The battery cell according to claim 32, characterized in that: Along the width direction of the first shell wall, the first extension portion is offset relative to the center position of the first main body portion; and / or, The second extension portion is offset relative to a center position of the second main body portion along a width direction of the first housing wall.

35. The battery cell according to claim 14, characterized in that The dimension of the first shell wall in the length direction is L, and the dimension of the first overlapping portion along the length direction of the first shell wall is A, and A is in the range of 10% to 40% of L.

36. The battery cell according to claim 35, characterized in that A is in the range of 3 mm to 50 mm.

37. The battery cell according to claim 32, characterized in that: Along the width direction of the first shell wall, the first extension portion and the second extension portion have a first overlapping portion, The dimension of the first overlapping portion along the length direction of the first shell wall is A, and A is in the range of 3 mm to 50 mm.

38. The battery cell according to claim 14, characterized in that: Along the length direction of the first housing wall, the first main body portion and the second main body portion have a second overlapping portion.

39. The battery cell according to claim 38, characterized in that The dimension of the first shell wall along the width direction is W, the dimension 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.

40. The battery cell according to any one of claims 1 to 11, 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.

41. The battery cell according to claim 14, characterized in that The first electrode terminal and the second electrode terminal each include a connection region for connecting to a busbar for electrically connecting the plurality of battery cells to each other, and the connection region is formed at least at the first overlapping portion.

42. The battery cell according to claim 41, characterized in that The connection area is also formed in at least one of the first body portion and the second body portion.

43. The battery cell according to any one of claims 1 to 11, characterized in that: The length of the first shell wall along the length direction is L, and L is less than or equal to 450 mm.

44. A battery, characterized in that: The invention comprises a casing and at least two battery cells according to any one of claims 1 to 43.

45. The battery according to claim 44, characterized in that The battery cells are arranged along the width direction of the first housing wall.

46. ​​The battery according to claim 45, characterized in that The first electrode terminal assembly includes a first electrode terminal, wherein the first electrode terminal includes a first main body portion and a first extension portion connected to each other, The second electrode terminal includes a second main body portion and a second extension portion connected to each other, Along the length direction of the first shell wall, at least a portion of the first extension portion and at least a portion of the second extension portion are located between the first main body portion and the second main body portion. In the adjacent battery cells, the first extending portion of one battery cell and the second extending portion of another battery cell are arranged along the width direction and are electrically connected through a busbar.

47. The battery according to claim 46, characterized in that In the same battery cell, along the width direction of the first housing wall, the first extension portion and the second extension portion have a first overlapping portion, In the adjacent battery cells, the first overlapping portion of one of the battery cells is electrically connected to the first overlapping portion of another of the battery cells through the bus bar.

48. The battery according to claim 46 or 47, 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 the direction perpendicular to the box wall where the boss is formed, the projections of the first electrode terminal assembly and the second electrode terminal do not exceed the projection of the boss, and the first electrode terminal assembly and / or the second electrode terminal are at least partially accommodated in the accommodation portion.

49. An electrical device, characterized in that: The electrical device comprises a plurality of battery cells according to any one of claims 1 to 43, or a battery according to any one of claims 44 to 48, and the battery cells or the battery provide power for the electrical device.

50. 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 43, or a battery according to any one of claims 44 to 48, wherein the battery cells or the battery are used to store electrical energy and can provide electrical energy.

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