Battery cell, battery, electric device, and energy storge device

Abstract

A battery cell (10), a battery (100), an electric device, and an energy storage device (2000). The battery cell (10) comprises: a casing (1), having an accommodating space (12), the casing (1) comprising a first casing wall (11); an electrode assembly (7), at least partially arranged in the accommodating space (12); a first electrode terminal assembly (30), arranged on the first casing wall (11); and a second electrode terminal (32), arranged on the first casing wall (11). Along the wall thickness direction of the first casing wall (11), at least a portion of the second electrode terminal (32) is arranged between the first electrode terminal assembly (30) and the first casing wall (11), and the first electrode terminal assembly (30) abuts against the second electrode terminal (32).

Description

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

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

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

[0003] With the increasing requirements of the industry for the volume utilization rate and lightweight of batteries, the shell of the battery cell tends to be large and thin. In this case, the shell of the battery cell tends to be insufficient in strength and is prone to bending deformation. In addition, sometimes the electrode terminal provided on the shell is deformed or broken. Therefore, how to improve the strength of the electrode terminal and the shell of the battery cell is one of the research directions of the industry.

[0004] SUMMARY

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

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

[0007] The first aspect of the present disclosure provides a battery cell, comprising: a shell having an accommodation space, the shell comprising a first shell wall; an electrode assembly at least partially provided in the accommodation space; a first electrode terminal assembly provided on the first shell wall; a second electrode terminal provided on the first shell wall; wherein at least part of the second electrode terminal is arranged between the first electrode terminal assembly and the first shell wall in the thickness direction of the first shell wall, and the first electrode terminal assembly abuts against the second electrode terminal.

[0008] 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 first electrode terminal assembly to the second electrode terminal can be strengthened, and the bending deformation resistance of the second electrode terminal can be improved. Moreover, the bending deformation resistance of the region of the first shell wall where the first electrode terminal and the second electrode terminal are arranged can also be strengthened.

[0009] In some embodiments, the first electrode terminal assembly comprises a first electrode terminal and a first insulating member fixed with the first electrode terminal, the second electrode terminal is at least partially arranged between the first insulating member and the first shell wall, and the first insulating member abuts against the second electrode terminal.

[0010] In this way, the first electrode terminal and the second electrode terminal are insulated from each other, and thus, even if the first electrode terminal and the second electrode terminal have opposite polarities, the bending resistance of the second electrode terminal can be improved by abutting the first insulating member against the second electrode terminal. Moreover, in the case that the first insulating member has a proper strength, the bending deformation of the second electrode terminal can be limited by the first insulating member.

[0011] In some embodiments, the electrode assembly comprises first and second pole pieces having opposite polarities, the first electrode terminal is electrically connected to the first pole piece of the electrode assembly, and the second electrode terminal is electrically connected to the second pole piece of the electrode assembly.

[0012] In this way, the electrode terminals having opposite polarities can be arranged on the first shell wall of the battery monomer, thereby facilitating reduction of the space occupied by the busbar and the like, facilitating arrangement of other structural members such as heat exchange members on other shell walls of the battery monomer, and facilitating improvement of the volume utilization of the battery.

[0013] In some embodiments, the first insulating member is partially arranged between the first electrode terminal and the first shell wall.

[0014] In this way, the first electrode terminal and the first shell wall can be insulated from each other.

[0015] In some embodiments, along the thickness direction of the first shell wall, the first electrode terminal, the first insulating member, and the second electrode terminal partially overlap each other, 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.

[0016] In this way, the bending deformation of the second electrode terminal can be limited by the first electrode terminal and the first insulating member together, and the first electrode terminal and the second electrode terminal are insulated from each other, thereby further strengthening the support and fixation of the first electrode terminal assembly on the second electrode terminal and improving the bending resistance of each electrode terminal. Moreover, the strength of the region of the first shell wall where the electrode terminals are arranged can be strengthened, and the electrode terminals have high freedom of polarity arrangement.

[0017] In some embodiments, 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 facing away from the accommodation space, the second electrode terminal includes a second terminal plate, the second terminal plate is disposed on a side of the first shell wall facing away from the accommodation space, the first insulating member is fixed to the first terminal plate; along a 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.

[0018] In this way, a structure for supporting and fixing the first electrode terminal assembly to the second electrode terminal can be formed on the side of the first shell wall facing away from the accommodation space, and the bending deformation of the second electrode terminal away from the first shell wall can be limited. Accordingly, the bending resistance of the region in the first shell wall is improved.

[0019] In some embodiments, 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 facing away from the accommodation space, the second electrode terminal includes a second terminal plate, the second terminal plate is disposed on a side of the first shell wall facing away from the accommodation space, along a wall thickness direction of the first shell wall, the first terminal plate is at least partially disposed between the second terminal plate and the first shell wall; or, along the wall thickness direction of the first shell wall, the second terminal plate is at least partially disposed between the first terminal plate and the first shell wall.

[0020] Since the electrode terminal includes a terminal plate located outside the shell of the battery monomer and a terminal disc located inside the shell, the electrode terminal can be connected to the tab of the electrode assembly through the terminal disc, and the heat dissipation, the support to the first shell wall and the connection strength to the bus member 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 higher. Moreover, the terminal plate and the terminal disc respectively clamp the first shell wall from the inside and outside of the shell, and the bending strength of the first shell wall can be improved. Moreover, the bending deformation resistance of the first terminal disc or the second terminal disc can be improved by disposing the second terminal disc and the first terminal disc to abut against each other, so as to further improve the bending strength of the electrode terminal and the first shell wall.

[0021] In some embodiments, the first electrode terminal assembly is provided with a first protrusion, the second electrode terminal is provided with a first recess, the first protrusion and the first recess at least partially overlap along a wall thickness direction of the first shell wall, and the first protrusion and the first recess cooperate with each other.

[0022] Thus, by matching the first protruding part and the first recessed part, the support and fixation of the first electrode terminal to the second electrode terminal are facilitated, the bending strength of the second electrode terminal is improved, and the processing is facilitated; by arranging the first protruding part in the first recessed part, the space occupied by the first protruding part is reduced, and the space utilization is improved.

[0023] In some embodiments, the first recessed part comprises a first stepped part and a second stepped part, the second stepped part is arranged on the side of the first stepped part away from the first electrode terminal assembly; the first protruding part comprises a protruding part arranged on the first electrode terminal, along the thickness direction of the first shell wall, a part of the second electrode terminal is located between the protruding part and the first shell wall, the protruding part is at least partially accommodated in the stepped space formed by the first stepped part; the first protruding part further comprises a first covering part arranged on the first insulating piece, along the thickness direction of the first shell wall, a part of the second electrode terminal is located between the first covering part and the first shell wall, the first covering part is at least partially accommodated in the stepped space formed by the second stepped part.

[0024] Thus, by matching the protruding part and the first stepped part, the bending deformation of the second electrode terminal is limited, and the protruding part is at least partially accommodated in the first stepped part, so as to reduce the space occupied by the protruding part and improve the space utilization. By arranging the first covering part, the creepage distance on the surface of the first electrode terminal and the second electrode terminal is increased, and the insulation reliability is improved. Moreover, by accommodating the first covering part in the stepped part, the first covering part does not occupy additional space, thereby improving the space utilization.

[0025] In some embodiments, along the thickness direction of the first shell wall, the surface of the side of the first covering part away from the first shell wall does not exceed the surface of the side of the first terminal plate away from the first shell wall; and / or, along the thickness direction of the first shell wall, the surface of the side of the first covering part away from the first shell wall does not exceed the surface of the side of the second terminal plate away from the first shell wall.

[0026] Since the surface of the side of the first covering part away from the first shell wall does not exceed the surface of the side of the first terminal plate and / or the second terminal plate away from the first shell wall, the first covering part does not protrude from the first terminal plate and / or the second terminal plate, thereby reducing the size of the battery monomer and even the battery pack along the thickness direction of the first shell wall; and to some extent, the first covering part is prevented from interfering with the busbar, so as to facilitate the reliable connection of the busbar and the like to the first terminal plate and the second terminal plate.

[0027] In some embodiments, a height difference between a surface of a side of the first terminal plate facing away from the first shell wall and a surface of a side of the second terminal plate facing away from the first shell wall in a wall thickness direction of the first shell wall is greater than or equal to 0 and less than or equal to 0.5 mm.

[0028] In this way, the first terminal plate and the second terminal plate are nearly flush, which helps to jointly bear external pressure and improve the anti-deformation capability.

[0029] In some embodiments, the first terminal plate comprises a first main body portion and a first extension portion connected to each other, the second terminal plate comprises a second main body portion and a second extension portion connected to each other, at least part of the first extension portion and at least part of the second extension portion are located between the first main body portion and the second main body portion in a length direction of the first shell wall, and the first extension portion and the second extension portion are arranged in a width direction of the first shell wall.

[0030] In this way, the terminal plate can be designed to have a main body portion and an extension portion, which helps to increase the heat dissipation area of the electrode terminal and increase the connection area and connection reliability of the electrode terminal and the busbar while stably connecting the terminal plate relative to the first shell wall. In addition, since the first extension portion and the second extension portion are located between the first main body portion and the second main body portion in the length direction of the first shell wall, the bending strength of the region of the first shell wall where the electrode terminal is arranged can be strengthened by the cooperation of the two terminal plates.

[0031] In some embodiments, the first extension portion and the second extension portion have a first overlapping portion in the width direction of the first shell wall.

[0032] In this way, by arranging the first extension portion and the second extension portion to overlap in the width direction of the first shell wall, the bending strength of the region of the first shell wall where the electrode terminal is arranged can be improved by the cooperation of the two electrode terminals. Moreover, the first electrode terminal assembly and the second electrode terminal can be arranged as compactly as possible, which helps to utilize the region of the first shell wall where no electrode terminal is arranged, and further helps to improve the volume utilization rate of the battery pack.

[0033] In some embodiments, the material of the first main body portion and / or the second main body portion is different from the material of the first overlapping portion.

[0034] In this way, the material of the first main body portion and the second main body portion can be arranged according to the situation, which helps to reduce current loss, improve heat dissipation capability, etc.

[0035] In some embodiments, the first electrode terminal further comprises a first terminal plate, at least a portion of the first terminal plate is arranged on a side of the first housing wall facing the accommodation space, the second electrode terminal further comprises a second terminal plate, at least a portion of the second terminal plate is arranged on a side of the first housing wall facing the accommodation space, the first main body part and the first terminal plate are directly connected by a first connecting column, and the second main body part and the second terminal plate are directly connected by a second connecting column.

[0036] Since the terminal plate and the terminal plate can be connected together by the connecting column, the electrode terminal can play a role of leading current out of the electrode assembly. Moreover, the connecting column is arranged on the main body part, so that the electrode terminal can be reliably fixed to the first housing wall at the main body part.

[0037] In some embodiments, the first recess is arranged on a side of the second extension part facing the first electrode terminal, and the first protrusion is arranged on a side of the first main body part facing the second electrode terminal.

[0038] Therefore, the first recess arranged on the second extension part can be fixed between the first protrusion and the first housing wall by abutting against the first protrusion arranged on the first main body part, so that the second extension part can be prevented from being bent away from the first housing wall to a certain extent due to the long extension, and the bending strength of the second extension part and the entire second electrode terminal is improved. Even if the electrode terminal is subjected to a pulling force from the busbar or the like, the electrode terminal is not easy to be bent or broken, and the connection reliability of the busbar and the electrode terminal is improved.

[0039] In some embodiments, the first electrode terminal further comprises a second recess, the second electrode terminal further comprises a second protrusion, the second protrusion and the second recess at least partially overlap in the thickness direction of the first housing wall, the second protrusion and the second recess are matched with each other, the second recess is arranged on a side of the first extension part facing the second electrode terminal, and the second protrusion is arranged on a side of the second main body part facing the first electrode terminal.

[0040] Therefore, the second recess arranged on the first extension part can be fixed between the second recess and the first housing wall by abutting against the second protrusion arranged on the second main body part, so that the first extension part can be prevented from being bent away from the first housing wall to a certain extent due to the long extension, and the bending strength of the first extension part and the entire first electrode terminal is improved. Moreover, the ability of the first electrode terminal assembly and the second electrode terminal to support and fix each other is further enhanced. Therefore, even if the first extension part is not fixed to the first housing wall by the rivet, the connecting column or the like, the first extension part can still be in reliable contact with the first housing wall, and the risk of poor sealing due to the installation of the rivet, the connecting column or the like can be reduced.

[0041] In some embodiments, the second recess comprises a third step portion and a fourth step portion, the fourth step portion is arranged on the side of the third step portion away from the second electrode terminal; the second protrusion comprises a protruding portion arranged on the second electrode terminal, along the thickness direction of the first shell wall, a part of the first electrode terminal is located between the protruding portion and the first shell wall, the protruding portion is at least partially accommodated in the step space formed by the third step portion; the second protrusion further comprises a second covering portion arranged on the second insulating member, along the thickness direction of the first shell wall, a part of the first electrode terminal is located between the second covering portion and the first shell wall, the second covering portion is at least partially accommodated in the step space formed by the fourth step portion.

[0042] Thus, the cooperation of the protruding portion and the third step portion can realize the limitation of the bending deformation of the first electrode terminal, and further at least partially accommodate the protruding portion in the third step portion to reduce the space occupied by the protruding portion and improve the space utilization. By arranging 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.

[0043] In some embodiments, the first extension portion is connected with the first terminal plate, the first recess is arranged on the side of the second extension portion facing the first electrode terminal, and the first protrusion is arranged on the side of the first extension portion facing the second electrode terminal.

[0044] Thus, the structure that the first protrusion and the first recess cooperate can also be formed between the two extension portions, and the first protrusion of the first extension portion which has been fixed to the first shell wall is used to press the first recess of the second extension portion on the first shell wall, so as to realize the mutual support of the two electrode terminals and improve the bending strength of the electrode terminals.

[0045] In some embodiments, the battery monomer further comprises a second insulating member, the second insulating member is at least partially located between the second electrode terminal and the first shell wall.

[0046] Thus, the second electrode terminal and the shell of the battery monomer can also be insulated, so that the design scheme of the shell being electrified can be applied, and the design scheme of the shell not being electrified can also be applied.

[0047] In some embodiments, the first insulating member and the second insulating member are integrally formed.

[0048] Thus, the number of parts can be reduced, and the assembly steps can be simplified.

[0049] In some embodiments, the first shell wall is formed with a first recess and a second recess, and at least a portion of the first insulating member and at least a portion of the second insulating member are respectively located in the first recess and the second recess.

[0050] In this way, the installation strength of the insulating member relative to the first shell wall is improved, the possibility of displacement of the insulating member along the surface of the first shell wall is reduced, and the positioning of the insulating member and the first shell wall relative to each other during assembly is facilitated.

[0051] In some embodiments, the first recess and the second recess form the same recess.

[0052] In this way, compared with forming recesses respectively, the processing difficulty is small and the processing is fast.

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

[0054] In this way, by cooperation of the first protrusion and the first recess, the support and fixation of the first electrode terminal to the second electrode terminal are facilitated, the bending strength of the second electrode terminal is improved, and the processing is facilitated; by arranging the first protrusion in the first recess, the space occupied by the first protrusion is reduced, and the space utilization 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 arranged on the side of the first shell wall away from the accommodation space, the second electrode terminal includes a second terminal plate, the second terminal plate is arranged on the side of the first shell wall away from the accommodation space, the first terminal plate and the second terminal plate partially overlap in the wall thickness direction of the first shell wall, and the first terminal plate directly or indirectly abuts against the second terminal plate.

[0056] In this way, a structure for supporting and fixing the first terminal plate to the second terminal plate can be formed on the side of the first shell wall away from the accommodation space, and the bending deformation of the second terminal plate away from the first shell wall can be limited; or, a structure for supporting and fixing the second terminal plate to the first terminal plate can be formed on the side of the first shell wall away from the accommodation space, and the bending deformation of the first terminal plate away from the first shell wall can be limited. Accordingly, the bending resistance of the region in the first shell wall is improved.

[0057] In some embodiments, the first electrode terminal assembly includes a first electrode terminal including a first terminal plate, at least a portion of the first terminal plate being disposed on a side of the first housing wall facing away from the accommodation space, the first terminal plate including a first main portion and a first extension portion connected to each other, the second electrode terminal includes a second terminal plate, the second terminal plate being disposed on a side of the first housing wall facing away from the accommodation space, the second terminal plate including a second main portion and a second extension portion connected to each other, at least a portion of the first extension portion and at least a portion of the second extension portion are located between the first main portion and the second main portion along a length direction of the first housing wall, and the first extension portion and the second extension portion are arranged along a width direction of the first housing wall.

[0058] Thus, the terminal plate can be designed to have a main portion and an extension portion, which is conducive to increasing the heat dissipation area of the electrode terminal and increasing the connection area and connection reliability of the electrode terminal and the busbar while enabling stable connection of the terminal plate relative to the first housing wall. In addition, since the first extension portion and the second extension portion are located between the first main portion and the second main portion along the length direction of the first housing wall, the bending strength of the region of the first housing wall in which the electrode terminal is disposed can be enhanced by cooperation of the two terminal plates.

[0059] In some embodiments, along a thickness direction of the first housing wall, a portion of the first electrode terminal assembly and the second electrode terminal that overlap is an overlapping region, a length of the overlapping region along a width direction of the first housing wall is W11, a length of the first housing wall along the width direction is W, and W11 is within a range of 10% to 90% of W.

[0060] Thus, the first housing wall along the width direction of the first housing wall can be fully utilized, and the support force between the first electrode terminal assembly and the second electrode terminal assembly can be reliably improved, the bending strength of the electrode terminal can be improved, and the strength of the first housing wall around the electrode terminal can also be enhanced.

[0061] In some embodiments, W11 is within a range of 0.5 mm to 50 mm.

[0062] Thus, the size of the overlapping region along the width direction of the first housing wall can be determined according to the size of the first housing wall along the width direction of the first housing wall, and by setting the size of the overlapping region along the width direction of the first housing wall to be larger, the support force between the first electrode terminal 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 housing wall around the electrode terminal can also be enhanced.

[0063] In some embodiments, the length of the overlapping region along the length direction of the first shell wall is L11, and L11 is in the range of 0.5mm to 6mm.

[0064] In this way, by setting the length of the overlapping region along the length direction of the first shell wall to be small, the fitting strength between the protruding part and the recessed part can be improved, and the space utilization can be improved.

[0065] In some embodiments, the size of the first main part along the width direction of the first shell wall is B1, the size of the first extension part along the width direction of the first shell wall is W1, B1 is greater than or equal to W1; and / or, the size of the second main part along the length direction of the first shell wall is B2, the size of the second extension part along the length direction of the first shell wall is W2, B2 is greater than or equal to W2.

[0066] In this way, the shape setting degree of freedom of the electrode terminal can be improved, the electrode terminal can be appropriately set according to the size of the first shell wall (in particular, the size along the width direction of the first shell wall), and the compact arrangement of the two electrode terminals is facilitated. Moreover, by setting the first main part and the second main part to be large, the mounting of the connecting column on the first main part and the second main part is facilitated, and the mounting stability of the electrode terminal with respect to the first shell wall is improved. By setting the width of the first extension part and the second extension part along the width direction of the first shell wall to be small, the weight of the electrode terminal, and even the battery monomer and the battery pack, can be reduced. Moreover, the overflow bottle neck part can also be formed by using the first extension part and the second extension part, thereby omitting the process of additionally processing the overflow bottle neck part.

[0067] In some embodiments, the first extension part is arranged to be offset with respect to the center position of the first main part along the width direction of the first shell wall; and / or, the second extension part is arranged to be offset with respect to the center position of the second main part along the width direction of the first shell wall.

[0068] In this way, the size 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, and the compact arrangement of the first electrode terminal and the second electrode terminal is facilitated.

[0069] In some embodiments, the size of the first shell wall along the length direction is L, and the size of the first overlapping part along the length direction of the first shell wall is A, A is in the range of 10% to 40% of L.

[0070] In this way, by setting the first overlapping part to be long, the strength of the electrode terminal setting area in the first shell wall, and even the entire first shell wall, can be improved.

[0071] In some embodiments, A is in the range of 3mm to 50mm.

[0072] In this way, the first overlapping portion is set to be longer, which is conducive to improving the strength of the electrode terminal setting area in the first shell wall or even the entire first shell wall.

[0073] In some embodiments, the first main body portion and the second main body portion have a second overlapping portion along the length direction of the first shell wall.

[0074] In this way, since there are overlapping portions in the length direction of the first shell wall and the width direction of the first shell wall, the first electrode terminal and the second electrode terminal can be arranged compactly in the length direction of the first shell wall and the width direction of the first shell wall, and the bending strength of the first shell wall can be further improved.

[0075] In some embodiments, the size of the first shell wall along the width direction is W, and the size 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.

[0076] In this way, the length dimension of the second overlapping area along the width direction of the first shell wall is set to be longer, which is conducive to improving the strength of the first shell wall.

[0077] In some embodiments, the closest distance between the first electrode terminal and the second electrode terminal along the length direction of the first shell wall and the width direction of the first shell wall is greater than or equal to 0.3mm.

[0078] In this way, the possibility of short-circuiting between the first electrode terminal and the second electrode terminal can be reduced.

[0079] In some embodiments, the first electrode terminal and the second electrode terminal each include a connection area for connecting with a busbar for electrically connecting a plurality of battery monomers to each other, and the connection area is formed at least in the first overlapping portion.

[0080] In this way, the busbar is connected to the part of the first electrode terminal and the second electrode terminal where the first overlapping portion is formed, and since this part has strong bending strength, even if the busbar causes bending stress to act on the first electrode terminal, the second electrode terminal, and the first shell wall, the first electrode terminal, the second electrode terminal, and the first shell wall are not easily bent and deformed, and are even less likely to be broken due to bending deformation.

[0081] In some embodiments, the connection area is also formed in at least one of the first main body portion and the second main body portion.

[0082] Therefore, the connection strength between the electrode terminal and the busbar can be further enhanced, the bending stress caused by the busbar can be further dispersed, and the anti-deformation ability of the electrode terminal and the first shell wall can be further improved.

[0083] In some embodiments, the first shell wall has a length L along the length direction of the first shell wall, and L is less than or equal to 450 mm.

[0084] Therefore, the electrode terminal can be arranged by fully utilizing the narrow side wall of the long strip-shaped battery monomer, the flexibility of the battery monomer group is improved, and heat dissipation of a large area is facilitated.

[0085] The second aspect of the present disclosure provides a battery including a box body and at least two battery monomers provided by the first aspect of the present disclosure.

[0086] Therefore, the battery with the strengthened strength of the first shell wall in the battery monomer can be provided, and the use reliability of the battery can be improved.

[0087] In some embodiments, each of the battery monomers is arranged along the width direction of the first shell wall.

[0088] Therefore, the volume utilization rate of the battery can be improved.

[0089] In some embodiments, the first electrode terminal assembly includes a first electrode terminal including a first main body part and a first extension part connected to each other, the second electrode terminal includes a second main body part and a second extension part connected to each other, at least part of the first extension part and at least part of the second extension part are located between the first main body part and the second main body part along the length direction of the first shell wall, in adjacent battery monomers, the first extension part of one battery monomer and the second extension part of another battery monomer are arranged along the width direction and are electrically connected by a busbar.

[0090] Since the busbar is connected to the first extension part and the second extension part located between the first main body part and the second main body part, the bending resistance of the connection part is strong, and therefore, the first electrode terminal, the second electrode terminal, and the first shell wall are not easy to bend and deform or break, thereby improving the use reliability of the battery.

[0091] In some embodiments, in the same battery monomer, the first extension part and the second extension part have a first overlapping part along the width direction of the first shell wall, in adjacent battery monomers, the first overlapping part of one battery monomer and the first overlapping part of another battery monomer are electrically connected by the busbar.

[0092] Therefore, the busbar is connected to the part of the first electrode terminal and the second electrode terminal where the first overlapping part is formed, and since this part has strong bending resistance, even if the busbar causes bending stress to act on the first electrode terminal, the second electrode terminal, and the first housing wall, the first electrode terminal, the second electrode terminal, and the first housing wall are not easily bent and deformed, and are less likely to break due to bending and deformation, thereby improving the use reliability of the battery.

[0093] In some embodiments, at least one of the box walls of the box has a boss formed by bulging in a direction away from the battery cell, the boss forms a receiving part on a side facing the battery cell, the projection of the first electrode terminal assembly and the second electrode terminal does not exceed the projection of the boss along a direction perpendicular to the box wall where the boss is formed, and the first electrode terminal assembly and / or the second electrode terminal is at least partially received in the receiving part.

[0094] Therefore, the height of the box at the position of the first electrode terminal assembly, the second electrode terminal, and the busbar can be increased, thereby reducing the size of the battery and improving the volume utilization of the battery.

[0095] The third aspect of the present disclosure provides a power-using device, which includes a plurality of the battery cell provided in the first aspect or the battery provided in the second aspect, and the battery cell or the battery supplies power to the power-using device.

[0096] Therefore, the power-using device provided with the battery having the electrode terminal and the housing that are less likely to be bent or have a small degree of bending deformation can be provided, the use reliability of the power-using device is improved, and the maintenance time of the power-using device is reduced.

[0097] The fourth aspect of the present disclosure provides an energy storage device, which includes a plurality of the battery cell provided in the first aspect or the battery provided in the second aspect, and the battery cell or the battery is configured to store and provide electric energy.

[0098] Therefore, the energy storage device provided with the battery having the electrode terminal and the housing that are less likely to be bent or have a small degree of bending deformation can be provided, the use reliability of the energy storage device is improved, and the maintenance time of the energy storage device is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0099] FIG. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present disclosure;

[0100] FIG. 2 is a structural exploded schematic diagram of a battery according to an embodiment of the present disclosure;

[0101] FIG. 3 is a structural schematic diagram of a battery cell according to an embodiment of the present disclosure;

[0102] FIG. 4 is a perspective schematic diagram of a battery cell according to an embodiment of the present disclosure;

[0103] FIG. 5 is a partial enlarged schematic diagram of portion A in FIG. 4;

[0104] FIG. 6 is a top view schematic diagram of a battery cell according to an embodiment of the present disclosure;

[0105] FIG. 7 is a cross-sectional view along B-B in FIG. 6;

[0106] FIG. 8 is a partial enlarged schematic diagram of portion C in FIG. 7;

[0107] FIG. 9 is a cross-sectional view according to another embodiment of the present disclosure;

[0108] FIG. 10 is a partial enlarged schematic diagram of portion C1 in FIG. 9;

[0109] FIG. 11 is a partial enlarged schematic diagram of portion C2 in FIG. 9;

[0110] FIG. 12 is a cross-sectional view according to yet another embodiment of the present disclosure;

[0111] FIG. 13 is a partial enlarged schematic diagram of portion C3 in FIG. 12;

[0112] FIG. 14 is a top view schematic diagram of a battery cell according to another embodiment of the present disclosure;

[0113] FIG. 15 is a top view schematic diagram of a battery cell according to yet another embodiment of the present disclosure;

[0114] FIG. 16 is a perspective schematic diagram of a battery cell according to still another embodiment of the present disclosure;

[0115] FIG. 17 is a partial enlarged schematic diagram of portion D in FIG. 16;

[0116] FIG. 18 is a top view schematic diagram of a battery cell according to still another embodiment of the present disclosure;

[0117] FIG. 19 is a cross-sectional view along E-E in FIG. 18;

[0118] FIG. 20 is a partial enlarged schematic diagram of portion F in FIG. 19;

[0119] FIG. 21 is a structural schematic diagram of a first shell wall according to some embodiments of the present disclosure;

[0120] FIG. 22 is a structural schematic diagram of a plurality of battery cells grouped according to some embodiments of the present disclosure;

[0121] FIG. 23 is an exploded schematic diagram of an electrode connection terminal according to some embodiments of the present disclosure;

[0122] FIG. 24 is a top view of a battery cell according to some embodiments of the present disclosure;

[0123] FIG. 25 is another top view of a battery cell according to some embodiments of the present disclosure;

[0124] FIG. 26 is a structural schematic diagram of an energy storage device according to an embodiment of the present disclosure;

[0125] FIG. 27 is a cross-sectional view of a battery with a boss according to an embodiment of the present disclosure;

[0126] FIG. 28 is a cross-sectional view of G-G in FIG. 14;

[0127] FIG. 29 is a partial enlarged view of the H portion in FIG. 28.

[0128] Legend 1000 vehicle; 100 battery; 200 controller; 300 motor; 10 battery cell; 20 case; 20A upper case; 20B lower case; 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 disc; 313 first connecting column; 314 first protrusion; 315 first recess; 3151 first step portion; 3152 second step portion; 316 terminal seal; 317 second recess; 3171 third step portion; 3172 fourth step portion; 32 second electrode terminal; 321 second terminal plate; 322 second terminal disc; 323 second connecting column; 325 third connecting column; 327 second protrusion; 51 first main body portion; 52 second main body portion; 61 first extension portion; 62 second extension portion; 7 electrode assembly; 71 first tab; 72 second tab; 81 first insulating member; 811 first covering portion; 82 second insulating member; 821 second covering portion; 91 first overlapping portion; 93 connecting region; 111a boss; 111b accommodation portion; 2000 energy storage device; 400 electrical cabin. DETAILED DESCRIPTION

[0129] It should be noted that the embodiments in the present disclosure and the technical features in the embodiments can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation and illustration of the purpose of the present disclosure, and should not be regarded as an improper limitation of the present disclosure.

[0130] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the use of the terms "including," "comprising," "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.

[0131] In the description of the disclosure, the technical terms "first", "second", "third", "fourth" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the disclosure, the meaning of "a plurality of" is more than two, unless otherwise explicitly and specifically limited.

[0132] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The occurrence of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0133] In the description of the disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0134] In the description of the embodiments of the disclosure, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the disclosure and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed in a particular orientation, be operated or used, and therefore cannot be understood as a limitation on the embodiments of the disclosure.

[0135] In the description of the disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the disclosure can be understood according to the specific circumstances.

[0136] In the description of the present disclosure, unless otherwise explicitly specified and limited, the technical term "contact" should be interpreted broadly, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without substantially interacting forces, or contact between two objects in contact with interacting forces.

[0137] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical terms "parallel" and "perpendicular" allow a certain degree of tolerance and / or error, including approximately parallel and approximately perpendicular.

[0138] In the following, the present disclosure will be described in detail.

[0139] At present, new energy batteries are increasingly widely used in life and industry. New energy batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields.

[0140] With the increasing requirements of the industry for the volume utilization rate and lightweight of the battery, the shell of the battery monomer tends to be large and thin. In this case, the shell of the battery monomer tends to be insufficient in strength and prone to bending deformation. In the related art, the electrode terminal is set to be large or is arranged compactly in order to improve the strength of the shell of the battery monomer by using the electrode terminal. However, in the case where the electrode terminal includes a long extending portion, even if the electrode terminal is fixedly connected to the shell wall or the top cover in the shell of the battery monomer, local bending and warping are prone to occur. Moreover, since the busbar is connected to the electrode terminal, the busbar is prone to pull the electrode terminal due to battery vibration and the like, which sometimes causes the electrode terminal to deform or break. Therefore, how to improve the bending strength of the electrode terminal and the shell of the battery monomer is one of the problems to be solved.

[0141] It has been found that if a limiting structure is provided for the part of the electrode terminal that is prone to bending and warping, the bending of the electrode terminal can be prevented to some extent. If two electrode terminals are arranged compactly and support each other, the part of one electrode terminal that is prone to bending and warping is limited by the other electrode terminal, which can prevent local warping of the electrode terminal to some extent, improve the bending strength of the electrode terminal, and further improve the bending strength of the electrode terminal setting area in the shell of the battery monomer.

[0142] Based on the technical concept, the battery cell provided by the present disclosure comprises a shell, an electrode assembly, a first electrode terminal assembly, a second electrode terminal; the shell has a containing space, and the shell comprises a first shell wall; the electrode assembly is at least partially arranged in the containing 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 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.

[0143] 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 fixing ability of the first electrode terminal assembly to the second electrode terminal can be increased, and the bending deformation resistance of the electrode terminal can be improved; and the strength of the region of the first shell wall where the electrode terminal is arranged can also be improved.

[0144] The battery cell provided by the embodiment of the present disclosure can be used in, but is not limited to, an electric device such as an energy storage device, a vehicle, a ship or an aircraft.

[0145] The battery cell provided by the embodiment of the present disclosure can also be used in groups as a battery (also known as a battery pack). The battery can also be used in, but is not limited to, an electric device such as an energy storage device, a vehicle, a ship or an aircraft.

[0146] The embodiment of the present disclosure also provides an electric device comprising the above-mentioned battery cell or battery. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles and spacecraft, etc.

[0147] The embodiment of the present disclosure also provides an energy storage device comprising the above-mentioned battery cell or battery, which comprises an energy storage container, an energy storage cabinet, etc.

[0148] For the convenience of description, the electric device of the embodiment of the present disclosure is taken as a vehicle 1000 for example. The following will be described with reference to the accompanying drawings.

[0149] FIG. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present disclosure. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. As shown in FIG. 1, the vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0150] In some embodiments of the present disclosure, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0151] FIG. 2 is a structural exploded schematic diagram of the battery according to an embodiment of the present disclosure. As shown in FIG. 2, the battery 100 includes a box body 20, which can be divided into an upper box body 20A and a lower box body 20B, and the upper box body 20A and the lower box body 20B are opposite to each other to form an arrangement space of the battery monomer 10 between them.

[0152] In the battery 100, the battery monomer 10 can be multiple, and the multiple battery monomers 10 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery monomers 10 are connected in series and in parallel. The multiple battery monomers 10 can be directly connected in series, in parallel, or in a mixed manner, and then the whole formed by the multiple battery monomers 10 is placed in the arrangement space defined by the upper box body 20A and the lower box body 20B. Of course, the battery 100 can also be that the multiple battery monomers 10 are first connected in series, in parallel, or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, which is accommodated in the arrangement space defined by the upper box body 20A and the lower box body 20B. The battery 100 can further include other structures, for example, the battery 100 can further include a current combiner (not shown in FIG. 2) for realizing electrical connection between the multiple battery monomers 10.

[0153] In the embodiments of the present disclosure, the battery monomer can be a secondary battery, which means that the battery monomer can be activated by charging after discharging to continue to be used.

[0154] The battery monomer can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited thereto.

[0155] Some embodiments of the present disclosure will be described in detail below with reference to Figs. 3 to 25.

[0156] Fig. 3 is a structural schematic diagram of a battery cell according to an embodiment of the present disclosure; Fig. 4 is a perspective schematic diagram of a battery cell according to an embodiment of the present disclosure; Fig. 5 is a partial enlarged schematic diagram of portion A in Fig. 4; Fig. 6 is a top view schematic diagram of a battery cell according to an embodiment of the present disclosure; Fig. 7 is a sectional view schematic diagram along B-B in Fig. 6; Fig. 8 is a partial enlarged schematic diagram of portion C in Fig. 7; Fig. 9 is a sectional view schematic diagram according to other embodiments of the present disclosure; Fig. 10 is a partial enlarged schematic diagram of portion C1 in Fig. 9; Fig. 11 is a partial enlarged schematic diagram of portion C2 in Fig. 9; Fig. 12 is a sectional view schematic diagram according to yet other embodiments of the present disclosure; Fig. 13 is a partial enlarged schematic diagram of portion C3 in Fig. 12; Fig. 14 is a top view schematic diagram of a battery cell according to another embodiment of the present disclosure; Fig. 15 is a top view schematic diagram of a battery cell according to yet another embodiment of the present disclosure; Fig. 16 is a perspective schematic diagram of a battery cell according to still another embodiment of the present disclosure; Fig. 17 is a partial enlarged schematic diagram of portion D in Fig. 16; Fig. 18 is a top view schematic diagram of a battery cell according to still another embodiment of the present disclosure;

[0157] Fig. 19 is a sectional view schematic diagram along E-E in Fig. 18; Fig. 20 is a partial enlarged schematic diagram of portion F in Fig. 19; Fig. 21 is a structural schematic diagram of a first housing wall according to some embodiments of the present disclosure; Fig. 22 is a structural schematic diagram of a plurality of battery cells grouped according to some embodiments of the present disclosure; Fig. 23 is an exploded schematic diagram of an electrode connection terminal according to some embodiments of the present disclosure; Fig. 24 is a top view schematic diagram of a battery cell according to some embodiments of the present disclosure; Fig. 25 is a further top view schematic diagram of a battery cell according to some embodiments of the present disclosure; Fig. 28 is a sectional view schematic diagram along G-G in Fig. 14; Fig. 29 is a partial enlarged schematic diagram of portion H in Fig. 28.

[0158] In the description of embodiments of the present disclosure, for ease of illustration, the direction in which arrow X is located represents the "length direction of the battery cell", the "length direction of the first housing wall", the direction in which arrow Y is located represents the "thickness direction of the battery cell", the "width direction of the first housing wall", and the direction in which arrow Z is located represents the "height direction of the battery cell", the "wall thickness direction of the first housing wall".

[0159] The first aspect of the present disclosure provides a battery cell as shown in FIGS. 3-20. The battery cell 10 includes: a housing 1 having a receiving space 12, the housing 1 including a first housing wall 11; an electrode assembly 7 disposed at least partially in the receiving space 12; a first electrode terminal assembly 30 disposed at the first housing wall 11; a second electrode terminal 32 disposed at the first housing wall 11; wherein the second electrode terminal 32 is disposed at least partially between the first electrode terminal assembly 30 and the first housing wall 11 along a wall thickness direction Z of the first housing wall, and the first electrode terminal assembly 30 abuts the second electrode terminal 32.

[0160] In some embodiments, the battery cell 10 includes an electrode assembly 7 as shown in FIG. 3. The electrode assembly 7 includes a positive electrode sheet, a negative electrode sheet, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode sheet and the negative electrode sheet, and can prevent the positive and negative electrodes from shorting while allowing the active ions to pass through. In the embodiment shown in FIG. 3, two jellyroll bodies formed by laminating and winding the positive electrode sheet, the negative electrode sheet, and the separator are shown as the electrode assembly 7, but the electrode assembly 7 is not limited to the jellyroll type shown in FIG. 3, and can also be a laminated sheet type or other structural forms.

[0161] The electrode assembly 7 is provided with tabs that can conduct current from the electrode assembly 7. The tabs include positive tabs and negative tabs. In the specific embodiment shown in FIG. 3, the electrode assembly 7 is shown as having a first tab 71 and a second tab 72, which are disposed on the same side of the electrode assembly 7 along the wall thickness direction Z of the first housing wall and are both disposed near one end of the electrode assembly 7 along the length direction X of the first housing wall. Of course, the first tab 71 and the second tab 72 can also be disposed on opposite sides of the electrode assembly 7; the first tab 71 and the second tab 72 can also be disposed near both ends of the electrode assembly 7 along the length direction X of the first housing wall, respectively.

[0162] In some embodiments, the battery cell 10 includes a housing 1. The housing 1 is used to encapsulate the electrode assembly 7 and other components such as electrolyte. The housing 1 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0163] In some embodiments, the outer shell can be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell serves to protect the electrode assembly, and a sealing bag is further included between the outer shell and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum plastic film. As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, and the like. In the embodiments shown in FIGS. 3-20, a square battery cell is taken as an example for illustration for the sake of convenience.

[0164] In some embodiments, as shown in FIG. 3, the outer shell 1 includes a plurality of shell walls, and a portion of the shell walls enclose a space with an opening, which can be closed by another shell wall (e.g., the first shell wall 11) to form a containing space 12 for containing the electrode assembly 7 and the electrolyte and the like. The outer shell 1 can be provided with one or more openings. The shell wall (e.g., the first shell wall 11) that closes the opening can also be configured as a top cover.

[0165] In some embodiments, as shown in FIG. 3, the outer shell 1 is provided with a first electrode terminal assembly 30 and a second electrode terminal 32, and the first electrode terminal 31 in the first electrode terminal assembly 30 and the second electrode terminal 32 are both electrically connected to the tab, which can be directly connected to the tab or indirectly connected to the tab through an adapter component. For the sake of convenience, in the embodiments of the present disclosure, the shell wall where the first electrode terminal assembly 30 and the second electrode terminal 32 are located is taken as the first shell wall 11.

[0166] Optionally, the first electrode terminal assembly 30 and the second electrode terminal 32 can have the same polarity or opposite polarity.

[0167] As shown in FIGS. 4-20, the second electrode terminal 32 is at least partially disposed between the first electrode terminal assembly 30 and the first shell wall 11.

[0168] 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.

[0169] Optionally, the first electrode terminal assembly 30 and the second electrode terminal 32 are both arranged on the first shell wall 11, and a portion of the second electrode terminal 32 extends into the gap formed between a portion of the first electrode terminal assembly 30 and the first shell wall 11.

[0170] The first electrode terminal assembly 30 and the second electrode terminal 32 can be provided near an end portion of the first housing wall 11, or can be provided at a substantially central position of the first housing wall 11 as shown in FIG. 14.

[0171] In some embodiments, the first electrode terminal assembly 30 abuts against the second electrode terminal 32. The abutment here includes a case where the first electrode terminal assembly 30 and the second electrode terminal 32 abut against each other due to bending deformation, and a case where the two are in an abutment state due to an initial assembly state having a pre-tightening force. The second electrode terminal 32 located between the first electrode terminal assembly 30 and the first housing wall 11 abuts against the first electrode terminal assembly 30. In the specific embodiment shown in FIG. 7, the surface of the second electrode terminal 32 located between the first electrode terminal assembly 30 and the first housing wall 11, on the side of the second electrode terminal 32 facing away from the first housing wall 11 in the wall thickness direction Z of the first housing wall, abuts against the surface of the first electrode terminal assembly 30, on the side of the first electrode terminal assembly 30 facing toward the first housing wall 11 in the wall thickness direction Z of the first housing wall.

[0172] For the first electrode terminal assembly and the second electrode terminal thus arranged, when the second electrode terminal has a tendency to be bent upward with respect to the first housing wall 11, the bending is prevented to some extent by the restraining effect of the first electrode terminal assembly in the wall thickness direction Z of the first housing wall.

[0173] Thus, since the second electrode terminal 32 is at least partially arranged between the first electrode terminal assembly 30 and the first housing 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 the electrode terminals to resist bending deformation can be improved. Furthermore, the strength of the region of the first housing wall 11 in which the electrode terminals are arranged can be increased.

[0174] In some embodiments, as shown in FIGS. 3 to 13 and 16 to 21, the first electrode terminal assembly 30 includes the first electrode terminal 31 and a first insulating member 81, the first insulating member 81 being fixed to the first electrode terminal 31, the second electrode terminal 32 being at least partially arranged between the first insulating member 81 and the first housing wall 11, the first insulating member 81 abutting against the second electrode terminal 32.

[0175] The first electrode terminal assembly includes the first electrode terminal 31 and the first insulating member 81 fixed to each other, and the fixing can be by one-piece injection molding, adhesion, fastening together by a connecting column, or the like.

[0176] In the embodiment shown in FIGS. 7-11, 19 and 20, the surface of the second electrode terminal 32 located between the first insulating member 81 and the first housing wall 11, on the side of the first housing wall 11 in the wall thickness direction Z of the first housing wall 11, abuts against the surface of the first insulating member 81 on the side of the first housing wall 11 in the wall thickness direction Z of the first housing wall 11.

[0177] In the embodiment shown in FIGS. 12 and 13, the first insulating member 81 is not located between the first electrode terminal 31 and the second electrode terminal 32, i.e., the first electrode terminal 31 is not pressed against the side of the first insulating member 81 facing away from the first housing wall 11. The side of the first insulating member 81 facing the first housing wall 11 abuts against the side of the second electrode terminal 32 facing away from the first housing wall 11, i.e., the bending deformation of the second electrode terminal 32 is limited by the portion of the first insulating member 81. Here, the first insulating member 81 has a suitable bending strength.

[0178] The first insulating member 81 is used at least to insulate the second electrode terminal 32 from the first electrode terminal 31, and can also be used to insulate the first electrode terminal 31 from the first housing wall 11.

[0179] In some embodiments, the first electrode terminal 31 and the second electrode terminal 32 are made of an electrically conductive metal material, such as copper or aluminum, and the first insulating member 81 is made of a plastic material, for example.

[0180] In some embodiments, the electrode assembly includes first and second polar plates having opposite polarities, the first electrode terminal 31 is electrically connected to the first polar plate of the electrode assembly, and the second electrode terminal 32 is electrically connected to the second polar plate of the electrode assembly.

[0181] The first and second polar plates are connected to the electrode terminals directly or indirectly through a tab. As shown in FIG. 3, the tab includes a first tab 71 and a second tab 72.

[0182] In some embodiments, the first insulating member 81 is arranged at least partially 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 connected to positive and negative tabs, respectively, and have opposite polarities, and the second electrode terminal 32 is arranged at least partially between the first insulating member 81 and the first housing wall 11. Further optionally, the first insulating member 81 is arranged between the entire first electrode terminal 31 and the first housing wall 11, and a portion of the first insulating member 81 is arranged between the first electrode terminal 31 and the first housing wall 11.

[0183] Optionally, the first electrode terminal 31 and the second electrode terminal 32 are connected to the same one of the positive and negative tabs and have the same polarity, and no insulating member is arranged between the first electrode terminal 31 and the second electrode terminal 32. Optionally, the second electrode terminal 32 is at least partially arranged between the first electrode terminal 31 and the first shell wall 11. Further optionally, a first insulating member 81 is arranged between the first electrode terminal 31 and the first shell wall 11.

[0184] Thus, the first electrode terminal 31 can be insulated from the shell 1 of the battery monomer, and the first electrode terminal 31 and the second electrode terminal 32 can be insulated from each other, so that even if the first electrode terminal 31 and the second electrode terminal 32 have opposite polarities, the bending resistance of each electrode terminal can be improved by cooperation, and the design freedom of the electrode terminal on the shell of the battery monomer is improved. Moreover, in the case that the first insulating member 81 has appropriate strength, the bending deformation of the second electrode terminal 32 can be limited by the first insulating member 81.

[0185] In some embodiments, as shown in FIGS. 7-10, 19 and 20, the first electrode terminal 31, the first insulating member 81 and the second electrode terminal 32 partially overlap in the thickness direction of the first shell wall 11, and the portion of the first electrode terminal 31 overlapping the first insulating member 81 and the second electrode terminal 32 abuts the first insulating member 81.

[0186] The first electrode terminal 31 abuts the first insulating member 81 and abuts the second electrode terminal 32 via the first insulating member 81.

[0187] 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 together, 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, the bending resistance of each electrode terminal can be improved, and the strength of the region of the first shell wall 11 where the electrode terminal is arranged can be improved. In addition, the polarity of the electrode terminal has high freedom.

[0188] In some embodiments, as shown in FIGS. 3-13, 16-20, the battery monomer 10 further comprises a second insulating member 82, and the second insulating member 82 is at least partially arranged between the second electrode terminal 32 and the first shell wall 11.

[0189] The second electrode terminal 32 and the first shell wall 11 can have an insulating member therebetween, or no insulating member can be arranged therebetween.

[0190] Optionally, the second electrode terminal 32 is connected to the negative tab, and no insulating member is provided between the second electrode terminal 32 and the first housing wall 11, and the first housing wall 11 or the entire housing 1 is negatively charged.

[0191] Optionally, the second electrode terminal 32 is connected to the positive tab or the negative tab, and the second electrode terminal 32 has a second insulating member 82 between the second electrode terminal 32 and the first housing wall 11, so that the first housing wall 11 or the entire housing 1 is insulated from the second electrode terminal 32 and is not charged.

[0192] In this way, the second electrode terminal 32 is also insulated from the housing 1 of the battery cell, so that it can be applied not only to the design scheme in which the housing is charged, but also to the design scheme in which the housing is not charged.

[0193] In some embodiments, as shown in FIGS. 12 and 13, the first insulating member 81 and the second insulating member 82 are integrally formed.

[0194] Alternatively, the first insulating member 81 and the second insulating member 82 can be separately formed, or integrally formed as one formed member. As a forming method, a commonly used forming method such as mold forming can be used.

[0195] The first insulating member 81 and the second insulating member 82 can be formed in a shallow tray shape that generally matches the shape of the first electrode terminal 31 and the second electrode terminal 32, so as to accommodate the first electrode terminal 31 and the second electrode terminal 32, so as to insulate the bottom surface and the peripheral surface of the first electrode terminal 31 and the second electrode terminal 32 in the wall thickness direction Z of the first housing wall.

[0196] In this way, the number of components can be reduced, and the assembly steps can be simplified.

[0197] In some embodiments, as shown in FIGS. 8, 20 and 21, the first housing wall 11 is formed with a first recess 111 and a second recess 112, and at least a portion of the first insulating member 81 and at least a portion of the second insulating member 82 are respectively located in the first recess 111 and the second recess 112.

[0198] The first recess 111 and the second recess 112 are recessed regions formed by thinning the thickness of the first housing wall 11 in the wall thickness direction Z of the first housing wall, and the plan view shape (the shape observed in the wall thickness direction Z of the first housing wall) thereof 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 region can be substantially the same as or slightly lower than the height (the dimension in the wall thickness direction Z of the first housing wall) of the first insulating member 81 or the second insulating member 82.

[0199] One or two or more first recesses 111 and / or second recesses 112 can be formed on the first housing wall 11.

[0200] Corresponding to the recessed regions, the portions of the first insulating member 81 located in the first recesses 111, the portions of the second insulating member 82 located in the second recesses 112 are respectively formed with protrusions which can respectively engage with the first recesses 111 and the second recesses 112, so as to be able to limit the movement of the first insulating member 81 and the second insulating member 82 relative to the first housing wall 11 in the surface direction of the first housing wall 11 (a direction perpendicular to the wall thickness direction Z of the first housing wall).

[0201] In this way, by causing at least a portion of the first insulating member 81 and at least a portion of the second insulating member 82 to be recessed into the recesses on the first housing wall 11, it is beneficial to improve the installation strength of the insulating members relative to the first housing wall 11, to reduce the possibility of displacement of the insulating members along the surface of the first housing wall 11, and to facilitate the positioning of the insulating members and the first housing wall 11 relative to each other during assembly.

[0202] In some embodiments, the first recesses 111 and the second recesses 112 form the same recess.

[0203] In this way, compared with forming recesses respectively, the processing difficulty is small and the processing is fast.

[0204] In some embodiments, as shown in FIGS. 4 to 8, the first electrode terminal assembly 30 is provided with a first protrusion 314, 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 in the wall thickness direction of the first housing wall 11, and the first protrusion 314 and the first recess 315 cooperate with each other.

[0205] The first protrusion 314 includes a structure protruding from the first electrode terminal 31 in the first electrode terminal assembly 30, and also includes a structure protruding from the first insulating member 81. As shown in FIG. 13, in the case where a portion (e.g., the first covering portion 811) of the first insulating member 81 abuts against the second electrode terminal 32 to limit bending deformation, the portion (e.g., the first covering portion 811) of the first insulating member 81 corresponds to the first protrusion 314. In the case where the first electrode terminal 31 and the first insulating member 81 abut against the second electrode terminal 32 to limit bending deformation, the first protrusion 314 includes a portion protruding from the second electrode terminal 32 and a portion protruding from the first insulating member 81.

[0206] The first protruding part 314 refers to a part of structure protruding from the first electrode terminal assembly 30 and entering into the outer contour of the second electrode terminal 32. The first recessed part 315 refers to a recess formed with respect to the surface of the second electrode terminal 32, which can accommodate the first protruding part 314. The recess can be formed by a groove, or can be formed by a step. In the case of being formed by a step, it can include a one-step, or a two-step or more steps.

[0207] Thus, by the cooperation of the first protruding part 314 and the first recessed part 315, the support and fixation of the first electrode terminal 31 to the second electrode terminal 32 are facilitated, the bending strength of the second electrode terminal 32 is improved, and the processing is facilitated. By arranging the first protruding part 314 in the first recessed part 315, the space occupied by the first protruding part 314 is reduced, and the space utilization is improved.

[0208] In some embodiments, the first electrode terminal assembly 30 includes the first electrode terminal 31, the first electrode terminal 31 includes a first terminal plate 311, at least part of the first terminal plate 311 is arranged on the side of the first shell wall 11 away from the accommodation space, the second electrode terminal 32 includes a second terminal plate 321, the second terminal plate 321 is arranged on the side of the first shell wall 11 away from the accommodation space, the first terminal plate 311 and the second terminal plate 321 partially overlap along the wall thickness direction Z of the first shell wall, and the first terminal plate 311 directly or indirectly abuts against the second terminal plate 321.

[0209] Thus, a structure for supporting and fixing the first terminal plate 311 to the second terminal plate 321 can be formed on the side of the first shell wall 11 away from the accommodation space, and the bending deformation of the second terminal plate 321 away from the first shell wall 11 can be limited. Alternatively, a structure for supporting and fixing the second terminal plate 321 to the first terminal plate 311 can be formed on the side of the first shell wall 11 away from the accommodation space, and the bending deformation of the first terminal plate 311 away from the first shell wall can be limited. Accordingly, the bending resistance of the region in the first shell wall 11 is improved.

[0210] In some embodiments, the first electrode terminal assembly 30 includes a first electrode terminal 31 including a first terminal plate 311, at least a portion of the first terminal plate being disposed on a side of the first housing wall 11 facing away from the accommodation space, the first terminal plate including a first main body portion 51 and a first extension portion 61 connected to each other, the second electrode terminal 32 including a second terminal plate 321 disposed on the side of the first housing wall 11 facing away from the accommodation space, the second terminal plate 321 including a second main body portion 52 and a second extension portion 62 connected to each other, at least a portion of the first extension portion 61 and at least a portion of the second extension portion 62 being located between the first main body portion 51 and the second main body portion 52 along a length direction of the first housing wall 11, and the first extension portion 61 and the second extension portion 62 being arranged along a width direction of the first housing wall 11.

[0211] Thus, the terminal plate can be designed to have a main body portion and an extension portion, which is conducive to increasing the heat dissipation area of the electrode terminal and increasing the connection area and connection reliability of the electrode terminal and the busbar while enabling stable connection of the terminal plate relative to the first housing wall 11. In addition, since the first extension portion 61 and the second extension portion 62 are located between the first main body portion 51 and the second main body portion 52 along the length direction of the first housing wall 11, the bending strength of the region of the first housing wall 11 in which the electrode terminal is disposed can be enhanced through cooperation of the two terminal plates.

[0212] In some embodiments, as shown in FIGS. 8, 10, and 20, the first electrode terminal 31 includes a first terminal plate 311, at least a portion of the first terminal plate 311 being disposed on a side of the first housing wall 11 facing away from the accommodation space, the second electrode terminal 32 includes a second terminal plate 321 disposed on the side of the first housing wall 11 facing away from the accommodation space, and a first insulating member 81 is fixed to the first terminal plate 311; along a wall thickness direction of the first housing wall 11, the first terminal plate 311, the first insulating member 81, and the second terminal plate 321 partially overlap, the second terminal plate 321 is partially disposed between the first insulating member 81 and the first housing wall 11, and the first terminal plate 311 abuts against the first insulating member 81.

[0213] Thus, a structure for supporting and fixing the first electrode terminal assembly 30 to the second electrode terminal 32 can be formed on the side of the first housing wall 11 facing away from the accommodation space, and the bending deformation of the second electrode terminal 32 away from the first housing wall 11 can be limited. Accordingly, the bending resistance of the region of the first housing wall 11 is improved.

[0214] In some embodiments, as shown in FIG. 8, FIG. 11 and FIG. 20, the first electrode terminal 31 comprises a first terminal disc 312, at least a portion of the first terminal disc 312 is arranged on the side of the first shell wall 11 facing the accommodating space, the second electrode terminal 32 comprises a second terminal disc 322, at least a portion of the second terminal disc 322 is arranged on the side of the first shell wall 11 facing the accommodating space. In the thickness direction of the first shell wall 11, the first terminal disc 312 is at least partially arranged between the second terminal disc 322 and the first shell wall 11; or, as shown in FIG. 11, in the thickness direction of the first shell wall 11, the second terminal disc 322 is at least partially arranged between the first terminal disc 312 and the first shell wall 11.

[0215] In some embodiments, as shown in FIG. 8, FIG. 11 and FIG. 20, the first electrode terminal 31 comprises a first terminal disc 312, at least a portion of the first terminal disc 312 is arranged on the side of the first shell wall 11 facing the accommodating space, the second electrode terminal 32 comprises a second terminal disc 322, at least a portion of the second terminal disc 322 is arranged on the side of the first shell wall 11 facing the accommodating space. In the thickness direction of the first shell wall 11, the first terminal disc 312 is at least partially arranged between the second terminal disc 322 and the first shell wall 11; or, as shown in FIG. 11, in the thickness direction of the first shell wall 11, the second terminal disc 322 is at least partially arranged between the first terminal disc 312 and the first shell wall 11.

[0216] The first terminal plate 311 and the second terminal plate 321 are arranged on the outside of the battery cell shell 1, and can be used to connect with busbars and the like; the first terminal disc 312 and the second terminal disc 322 are arranged on the inside of the battery cell shell 1, and can be used to electrically connect with the tabs. The terminal plate and the terminal disc can be made of metal, such as copper, aluminum, etc.

[0217] Optionally, the first terminal plate 311, the second terminal plate 321, the first terminal disc 312 and the second terminal disc 322 each have a generally flat plate shape. The shape of the flat plate can be designed according to the situation, for example, it can be rectangular, circular, L-shaped as shown in FIG. 18, etc.

[0218] Optionally, the first terminal plate 311, the second terminal plate 321, the first terminal disc 312 and the second terminal disc 322 can be fixed together with the first shell wall 11 by connecting columns or the like.

[0219] As described above, the first terminal plate 311 and the second terminal plate 321 can partially overlap each other with a portion of the first insulating member 81 in a direction perpendicular to the wall thickness of the first case wall 11. Similarly, the first terminal disc 312 and the second terminal disc 322 can partially overlap each other with a portion of an insulating member, which is different from the first insulating member 81, for example, an insulating member located below the first case wall 11, in a direction perpendicular to the wall thickness of the first case wall 11.

[0220] Since the electrode terminal includes the terminal plate and the terminal disc which are respectively located outside and inside the case of the battery cell 10, the electrode terminal can be easily connected to the tab of the electrode assembly through the terminal disc, and the heat dissipation, the support to the first case wall 11 and the connection strength to the bus member 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 higher. Moreover, the first case wall 11 is sandwiched by the terminal plate and the terminal disc from the inside and outside of the case 1, respectively, and the bending strength of the first case wall 11 can be improved.

[0221] In some embodiments, as shown in FIG. 3, the electrode assembly 7 has a first tab and a second tab which lead out the first tab 71 and the second tab 72, respectively, and the first tab 71 and the second tab 72 have opposite polarities, and the first electrode terminal 31 and the second electrode terminal 32 have the same polarity.

[0222] One of the first tab 71 and the second tab 72 can be a positive tab, and the other can be a negative tab. The first electrode terminal 31 and the second electrode terminal 32 can be connected to the first tab 71, and thus have the same polarity as the first tab 71, or the first electrode terminal 31 and the second electrode terminal 32 can be connected to the second tab 72, and thus have the same polarity as the second tab 72.

[0223] Thus, the first electrode terminal 31 and the second electrode terminal 32 can have the same polarity according to the situation, and thus the electrode terminal can be arranged on the case of the battery cell 10 flexibly according to the need.

[0224] In some embodiments, the first terminal disc 312 of the first electrode terminal 31 and the second terminal disc 322 of the second electrode terminal 32 are electrically connected to the same one of the first tab 71 and the second tab 72.

[0225] Optionally, the first electrode terminal 31 and the second electrode terminal 32 can be directly connected to the first tab 71, or can be connected to the first tab 71 through an adapter. Optionally, the first electrode terminal 31 and the second electrode terminal 32 can be directly connected to the second tab 72, or can be connected to the second tab 72 through an adapter.

[0226] Thus, the two electrode terminals can be easily made to have the same polarity, and the connection of the electrode terminals to the lugs is stable and reliable.

[0227] In some embodiments, as shown in FIGS. 4-8, 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 in the thickness direction of the first housing wall 11, and the first protrusion 314 and the first recess 315 cooperate with each other.

[0228] The first protrusion 314 includes a structure that protrudes partially from the first electrode terminal 31 in the first electrode terminal assembly 30, and also includes a structure that protrudes partially from the first insulating member 81. As shown in FIG. 13, in the case where a portion (e.g., the first cover portion 811) of the first insulating member 81 abuts against the second electrode terminal 32 to limit bending deformation, the portion (e.g., the first cover portion 811) of the first insulating member 81 corresponds to the first protrusion 314. In the case where the first electrode terminal 31 and the first insulating member 81 abut against the second electrode terminal 32 to limit bending deformation, the first protrusion 314 includes a portion that protrudes from the second electrode terminal 32 and a portion that protrudes from the first insulating member 81.

[0229] The first protrusion 314 refers to a portion of structure that protrudes from the first electrode terminal assembly 30 and enters the outer contour of the second electrode terminal 32. The first recess 315 refers to a recess that can accommodate the first protrusion 314 formed with respect to the surface of the second electrode terminal 32, and 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 one-step, or a two-step or more steps.

[0230] Here, the first protrusion 314 and the first recess 315 in the cooperating state can at least limit displacement in the thickness direction Z of the first housing wall with respect to each other. Optionally, the first protrusion 314 and the first recess 315 in the cooperating state can also limit displacement in the length direction X of the first housing wall and / or in the width direction Y of the first housing wall with respect to each other.

[0231] In addition, since the first protrusion 314 and the first recess 315 in FIG. 20 have similar structures to the first protrusion 314 and the first recess 315 in FIG. 8, the illustration and detailed description of the first protrusion and the first recess in FIG. 20 are omitted.

[0232] In some embodiments, as shown in FIG. 8, the first recess 315 includes a first step portion 3151 and a second step portion 3152, the second step portion 3152 being disposed on a side of the first step portion 3151 away from the first electrode terminal assembly 30; the first protrusion includes a protruding portion provided on the first electrode terminal 31, a portion of the second electrode terminal 32 being located between the protruding portion and the first housing wall 11 in the wall thickness direction of the first housing wall 11, the protruding portion being at least partially accommodated in a step space formed by the first step portion 3151; the first protrusion 314 further includes a first covering portion 811 provided on the first insulating member 81, a portion of the second electrode terminal 32 being located between the first covering portion 811 and the first housing wall 11 in the wall thickness direction of the first housing wall 11, the first covering portion 811 being at least partially accommodated in a step space formed by the second step portion 3152.

[0233] Here, the first protrusion 314 includes the protruding portion and the first covering portion 811; the first recess 315 includes the first step portion 3151 and the second step portion 3152.

[0234] The first step portion 3151 is formed by a portion of the second terminal plate 321 that is lowered in the wall thickness direction of the first housing wall 11 away from the first housing wall 11, as shown in the portion of the second terminal plate 321 in the dashed line frame on the left side in FIG. 13. The protruding portion is accommodated in the first step portion 3151, and the first insulating member 81 is interposed between the protruding portion and the first step portion 3151.

[0235] The first step portion 3151 is formed on a side surface of the second electrode terminal 32 in the wall thickness direction of the first housing wall 11 away from the first housing wall 11, the protruding portion is accommodated in the first step portion 3151, and the first insulating member 81 is interposed between the protruding portion and the first step portion 3151.

[0236] The first insulating member 81 also has a portion that covers a surface of the protruding portion in contact with the recess, so that in a state in which 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 enabling an insulating state to be maintained.

[0237] As shown in FIGS. 7 and 8, in the second electrode terminal 32, a second step portion 3152 is further formed at a position further away from the protruding portion than the first step portion 3151, and the first insulating member 81 has a first covering portion 811 that covers the second step portion 3152 from a side away from the first housing wall 11 in the wall thickness direction of the first housing wall 11.

[0238] The second stepped portion 3152 can be a portion that is lowered in the wall thickness direction Z of the first housing wall with respect to a surface of the second electrode terminal 32 that is farthest from the first housing wall 11; and the first covering portion 811 can be a portion of the first insulating member 81. The first covering portion 811 can be partially or entirely recessed in the second stepped portion 3152 in the wall thickness direction Z of the first housing wall.

[0239] The length of the second stepped portion 3152 and the first covering portion 811 in the length direction X of the first housing wall can be determined according to the creepage distance to be provided. Generally, the longer the length of the second stepped portion 3152 and the first covering portion 811 in the length direction X of the first housing wall, the greater the creepage distance and the higher the insulation reliability.

[0240] Since the stepped portion and the first covering portion in FIG. 15 have similar structures to the stepped portion and the first covering portion in FIG. 8, the illustration of the stepped portion and the first covering portion in FIG. 15 is omitted.

[0241] Thus, the limitation on the bending deformation of the second electrode terminal 32 can be achieved by the cooperation of the protruding portion and the first stepped portion 3151, and the protruding portion is further at least partially accommodated in the first stepped portion 3151, so that the space occupied by the protruding portion is reduced and the space utilization is improved. 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 is improved. Moreover, by accommodating the first covering portion 811 in the second stepped portion 3152, the first covering portion 811 does not occupy additional space, thereby improving the space utilization.

[0242] In some embodiments, as shown in FIGS. 7 and 8, the surface of the first covering portion 811 on the side away from the first housing wall 11 does not exceed the surface of the first terminal plate 311 on the side away from the first housing wall 11 in the wall thickness direction of the first housing wall 11; and / or the surface of the first covering portion on the side away from the first housing wall 11 does not exceed the surface of the second terminal plate 321 on the side away from the first housing wall 11 in the wall thickness direction of the first housing wall 11.

[0243] The surface of the first covering portion 811 on the side away from the first housing wall 11 can be substantially flush or slightly lower than the surface of the first terminal plate 311 on the side away from the first housing wall. In addition, the surface of the first covering portion 811 on the side away from the first housing wall 11 can be substantially flush or slightly lower than the surface of the second terminal plate 321 on the side away from the first housing wall 11. In a specific embodiment, the surface of the first covering portion 811 on the side away from the first housing wall 11 is substantially flush with the surface of the first terminal plate 311 on the side away from the first housing wall, and the surface of the second terminal plate 321 on the side away from the first housing wall 11. Here, substantially flush means no obvious step difference.

[0244] Since the surface of the side of the first cover portion 811 facing away from the first housing wall 11 does not exceed the surface of the side of the first terminal plate 311 and / or the second terminal plate 321 facing away from the first housing wall 11, the first cover portion 811 does not additionally occupy the space of the battery cell or even the battery pack in the wall thickness direction of the first housing wall, and to some extent avoids interference between the first cover portion 811 and the busbar, facilitating reliable connection of the busbar and the like with the first terminal plate 311 and the second terminal plate 321. In some embodiments, as shown in FIG. 6, the first terminal plate 311 includes a first main portion 51 and a first extension portion 61 connected to each other, and the second terminal plate 321 includes a second main portion 52 and a second extension portion 62 connected to each other, and along the length direction X of the first housing wall, at least part of the first extension portion 61 and at least part of the second extension portion 62 are located between the first main portion 51 and the second main portion 52.

[0245] In some embodiments, along the wall thickness direction Z of the first housing wall, the height between the surface of the side of the first terminal plate 311 facing away from the housing wall and the surface of the side of the second terminal plate 321 facing away from the first housing wall is greater than or equal to 0 and does not exceed 0.5 mm.

[0246] Thus, the first terminal plate 311 and the second terminal plate 321 are almost flush, which helps to share the external pressure together and improves the anti-deformation capability.

[0247] In some embodiments, the first terminal plate 311 includes a first main portion 51 and a first extension portion 61 connected to each other, and the second terminal plate 321 includes a second main portion 52 and a second extension portion 62 connected to each other, and along the length X of the first housing wall, at least part of the first extension portion 61 and at least part of the second extension portion 62 are located between the first main portion 51 and the second main portion 52, and the first extension portion 61 and the second extension portion 62 are arranged along the width direction Y of the first housing wall.

[0248] The first terminal plate 311 includes a first main portion 51, in FIG. 6, the part of the first terminal plate 311 located in the dashed line frame is the first main portion 51, and the remaining part (excluding the extension portion) of the first terminal plate 311 is the first extension portion 61. Similarly, the second terminal plate 321 includes a second main portion 52 and a second extension portion 62.

[0249] In the specific example shown in FIG. 6, the first body portion 51 and the second body portion 52 are formed in a substantially rectangular shape with the long sides extending in the width direction Y of the first housing wall, and the first body portion 51 and the second body portion 52 are arranged in the length direction X of the first housing wall. The first extension portion 61 and the second extension portion 62 are each formed in a substantially rectangular shape with the long sides extending in the length direction X of the first housing wall, and the first extension portion 61 and the second extension portion 62 are arranged in the width direction Y of the first housing wall. Thus, in the length direction X of the first housing wall, the first extension portion 61 and the second extension portion 62 are positioned between the first body portion 51 and the second body portion 52.

[0250] Of course, the shapes and arrangement positions of the first body portion 51, the first extension portion 61, the second body portion 52, and the second extension portion 62 are not limited to the example shown in FIG. 6.

[0251] In the specific example shown in FIG. 6, the first body portion 51 and the second body portion 52 are arranged relatively close to each other in the length direction X of the first housing wall, that is, the distance between the first body portion 51 and the second extension portion 62 is short, and the distance between the second body portion 52 and the first extension portion 61 is short. However, the distance between the first body portion 51 and the second extension portion 62 can be long, and the distance between the second body portion 52 and the first extension portion 61 can be long, as shown in FIG. 10.

[0252] In the specific example shown in FIG. 6, the outer edges (edges close to the long sides of the first housing wall 11) of the second body portion 52 and the first extension portion 61 are substantially flush with each other in the width direction Y of the first housing wall, and the outer edges of the first body portion 51 and the second extension portion 62 are substantially flush with each other in the width direction Y of the first housing wall. However, the outer edges can not be flush. Alternatively, one of the outer edges of the second body portion 52 and the outer edge of the first extension portion 61 can be closer to the long side of the first housing wall 11, and / or one of the outer edge of the first body portion 51 and the outer edge of the second extension portion 62 can be closer to the long side of the first housing wall 11.

[0253] Thus, the terminal plate can be designed to have a body portion and an extension portion, which is advantageous for increasing the heat dissipation area of the electrode terminal and for increasing the connection area and connection reliability of the electrode terminal to the bus bar while stably connecting the terminal plate to the first housing wall 11. In addition, since the first extension portion 61 and the second extension portion 62 are positioned between the first body portion 51 and the second body portion 52 in the length direction X of the first housing wall, the bending strength of the region of the first housing wall 11 in which the electrode terminal is provided can be increased by the cooperation of the two terminal plates.

[0254] In some embodiments, the first extension 61 and the second extension 62 have a first overlapping portion along the width direction Y of the first housing wall.

[0255] In this way, by arranging the first extension 61 and the second extension 62 to overlap in the width direction Y of the first housing wall, the bending strength of the region of the first housing wall where the electrode terminals are arranged can be improved by the synergy of the two electrode terminals. Moreover, the first electrode terminal assembly and the second electrode terminal can be arranged as compactly as possible, which is conducive to the utilization of the non-electrode terminal arrangement region of the first housing wall, and further conducive to the utilization rate of the volume of the battery pack.

[0256] In some embodiments, the material of the first body portion 51 and / or the second body portion 52 is different from the material of the first overlapping portion.

[0257] In this way, the material of the first body portion 51 and the second body portion 52 can be arranged according to the situation, which is conducive to reducing current loss, improving heat dissipation capacity, etc.

[0258] In some embodiments, as shown in FIGS. 6-8, the first electrode terminal further includes a first terminal plate, at least a portion of the first terminal plate being arranged on the side of the first housing wall facing the accommodation space, the second electrode terminal further includes a second terminal plate, at least a portion of the second terminal plate being arranged on the side of the first housing wall facing the accommodation space, the first body portion 51 and the first terminal plate 312 are directly connected by a first connecting column 313; the second body portion 52 and the second terminal plate 322 are directly connected by a second connecting column 323.

[0259] The first connecting column 313 can be connected to the first body portion 51 or the first terminal plate 312 by threading, welding, riveting, etc., or can be formed integrally with the first body portion 51 or the first terminal plate 312. The second connecting column 323 can be connected similarly to the first connecting column 313, so here the first connecting column 313 is described in detail, and the detailed description of the second connecting column 323 is omitted.

[0260] In some embodiments, as shown in FIG. 8, the first connecting column 313 is formed integrally with the first terminal plate 312 and extends perpendicularly relative to the disc surface of the first terminal plate 312. The first body portion 51 in the first terminal plate 311 is formed with a through hole, and the first connecting column 313 is inserted into the through hole and fixedly connected to the first body portion 51. In this way, the first electrode terminal 31 can be assembled to the first housing wall 11. In addition, a terminal sealing member 316 can be further assembled between the first connecting column 313 and the first body portion 51.

[0261] Since the terminal plate and the terminal disc can be connected together through the connecting column, the electrode terminal can play a role of leading current from the electrode assembly. Moreover, the connecting column is arranged on the main body part, so that the electrode terminal can be reliably fixed to the first housing wall 11.

[0262] In some embodiments, the first recess 315 is arranged on the side of the second extending part 62 facing the first electrode terminal 31, and the first protrusion 314 is arranged on the side of the first main body part 51 facing the second electrode terminal 32.

[0263] The first main body part 51 is fixedly connected to the first housing wall 11 through the first connecting column 313, so that the connection of the first main body part 51 to the first housing wall 11 is firm. Moreover, compared with the first extending part 61, the shape of the first main body part 51 is also not easy to bend. Therefore, the first protrusion 314 mainly playing a role of preventing warping is arranged on the first main body part 51, and the first recess 315 is arranged on the second extending part 62 which is easy to warp, and the first recess 315 is located between the first protrusion 314 and the first housing wall 11, so that the first protrusion 314 prevents the first recess 315 and the second extending part 62 from warping away from the first housing wall 11 to a certain extent.

[0264] Therefore, the first recess 315 arranged on the second extending part 62 can be fixed between the first protrusion 314 and the first housing wall 11 by being abutted by the first protrusion 314 arranged on the first main body part 51, so that the second extending part 62 is prevented from warping away from the first housing wall 11 to a certain extent due to the long extension, and the bending strength of the second extending part 62 and the entire second electrode terminal 32 is improved. Even if the electrode terminal is subjected to a pulling force from the busbar or the like, the electrode terminal is not easy to bend or break, and the connection reliability of the busbar and the electrode terminal is improved.

[0265] For the first extending part 61, the end extending away from the first main body part 51 can be fixed to the first housing wall 11 through the third connecting column 325.

[0266] In the embodiments shown in FIGS. 4 to 8, only one set of matching protrusion and recess is arranged, but more sets of protrusion and recess can also be arranged.

[0267] In some embodiments, as shown in FIG. 14, the first electrode terminal 31 is further provided with a second recessed portion 317, and the second electrode terminal 32 is further provided with a second protruding portion 327, the second protruding portion 327 at least partially overlaps with the second recessed portion 317 along the wall thickness direction of the first housing wall 11, the second protruding portion 327 cooperates with the second recessed portion 317, 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.

[0268] The second recessed portion 317 and the second protruding portion 327 can adopt a similar cooperation structure as the recessed portion and the protruding portion, and detailed description is omitted here.

[0269] In the case where the second recessed portion 317 and the second protruding portion 327 are provided, the third connecting column 325 can be omitted.

[0270] In this way, the second recessed portion 317 arranged on the first extension portion 61 can be abutted by the second protruding portion 327 arranged 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 being warped away from the first housing wall 11 to some extent due to the extension being too long, and improving the bending strength of the first extension portion 61 and the entire first electrode terminal 31. Furthermore, the ability of the first electrode terminal assembly 30 and the second electrode terminal 32 to support and fix each other is further enhanced. In this way, even if the first extension portion 61 is not fixed to the first housing wall 11 by a rivet, a connecting column or the like, the first extension portion 61 can still be in reliable contact with the first housing wall 11, and the risk of poor sealing due to the installation of a rivet, a connecting column or the like can also be reduced.

[0271] The recessed portion and the protruding portion can not only be arranged between the main body portion and the extension portion, but also between two extension portions.

[0272] In some embodiments, as shown in FIG. 14, FIG. 28 and FIG. 29, the second recessed portion 317 includes a third stepped portion 3171 and a fourth stepped portion 3172, the fourth stepped portion 3172 is arranged on the side of the third stepped portion 3171 away from the second electrode terminal; the second protruding portion includes a protruding portion arranged on the second electrode terminal, a part of the first electrode terminal is located between the protruding portion and the first housing wall 11 along the wall thickness direction of the first housing wall, and the protruding portion is at least partially accommodated in the stepped space formed by the third stepped portion 3171; the second protruding portion further includes a second covering portion 821 arranged on the second insulating member 82, a part of the first electrode terminal is located between the second covering portion 821 and the first housing wall along the wall thickness direction of the first housing wall, and the second covering portion 821 is at least partially accommodated in the stepped space formed by the fourth stepped portion 3172.

[0273] The third stepped portion 3171 is formed by a portion of the first terminal plate 311 that is lowered in a direction of a wall thickness of the first housing wall 11 toward a side away from the first housing wall 11, as shown in a portion of the first terminal plate 311 in a dashed line frame on the right in FIG. 29. The protruding portion is accommodated in the third stepped portion 3171, and the second insulating member 82 is interposed between the protruding portion and the third stepped portion 3171.

[0274] Thus, the protruding portion and the third stepped portion 3171 cooperate to limit bending deformation of the first electrode terminal, and the protruding portion is at least partially accommodated in the third stepped portion 3171 to reduce the space occupied by the protruding portion and improve space utilization. By providing the second covering portion 821, the creepage distance on the surfaces of the first electrode terminal and the second electrode terminal can be increased, and insulation reliability can be improved. Moreover, by accommodating the second covering portion 821 in the stepped portion, the second covering portion 821 does not occupy additional space, thereby improving space utilization.

[0275] In some embodiments, as shown in FIG. 15, the first extending portion 61 is connected to the first terminal plate 312, the recessed portion is provided on a side of the second extending portion 62 facing the first electrode terminal 31, and the protruding portion is provided on a side of the first extending portion 61 facing the second electrode terminal 32.

[0276] The protruding portion and the recessed portion in the embodiment shown in FIG. 15 can have a similar cooperation structure as the protruding portion and the recessed portion in the embodiment shown in FIG. 8, and detailed descriptions are omitted here.

[0277] Thus, the protruding portion and the recessed portion in the embodiment shown in FIG. 15 can have a similar cooperation structure as the protruding portion and the recessed portion in the embodiment shown in FIG. 8, and detailed descriptions are omitted here.

[0278] In some embodiments, along the direction of the wall thickness of the first housing wall 11, a portion of the first electrode terminal assembly 30 that overlaps the second electrode terminal 32 is an overlapping region, a length of the overlapping region in a width direction of the first housing wall is W11, a length of the first housing wall 11 in the width direction of the first housing wall is W, W11 is in a range of 10% to 90% of W, the length direction X of the first housing wall is a length direction of the first housing wall 11, and the width direction Y of the first housing wall is a width direction of the first housing wall 11.

[0279] The overlapping region refers to the second electrode terminal 32 being positioned between the first electrode terminal assembly 30 and the first housing wall 11 such that the second electrode terminal 32 and the first electrode terminal assembly 30 form an overlapping region in the wall thickness direction of the first housing wall 11. In FIG. 24, the length of the overlapping region in the width direction Y of the first housing wall is denoted by W11.

[0280] The length of the first housing wall 11 in the width direction Y of the first housing wall refers to the largest dimension among the lengths of the outer contour of the first housing wall 11 in the width direction of the first housing wall. In FIG. 19, the length of the first housing wall 11 in the width direction Y of the first housing wall is denoted by W.

[0281] The length W11 of the overlapping region in the width direction of the first housing wall can be 10% to 90% of the length W of the first housing wall 11 in the width direction of the first housing wall, i.e., W11 / W is in the range of 10% to 90%. For example, it can be 10%, 15%, 20%, 30%, 50%, 70%, 90%, and of course other values in the above range.

[0282] Thus, the first housing wall 11 can be fully utilized in the width direction Y of the first housing wall, and the support force between the first electrode terminal assembly 30 and the second electrode terminal 32 can be reliably improved, the bending strength of the electrode terminal can be improved, and the strength of the first housing wall around the electrode terminal can be strengthened.

[0283] In some embodiments, the length W11 of the overlapping region in the width direction Y of the first housing wall is in the range of 0.5 mm to 50 mm.

[0284] For example, the length W11 of the overlapping region in the width direction Y of the first housing wall can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 15 mm, 20 mm, 30 mm, 40 mm, 50 mm. Of course, it can also be other values in the range of 0.5 mm to 50 mm.

[0285] Thus, the length W11 of the overlapping region in the width direction of the first housing wall can be determined according to the length W of the first housing wall in the width direction of the first housing wall, and by setting the length W11 of the overlapping region in the width direction of the first housing wall to be larger, the support force between the first electrode terminal 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 housing wall around the electrode terminal can be strengthened.

[0286] In some embodiments, as shown in FIG. 8, the length L11 of the overlapping region in the length direction X of the first housing wall is in the range of 0.5 mm to 6 mm.

[0287] For example, the length L11 of the overlapping region along the length direction X of the first housing wall can be 0.5 mm, 1 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, etc. Of course, it can also be other values in the range of 0.5 mm to 6 mm.

[0288] In this way, by setting the length L11 of the overlapping region along the length direction of the first housing wall to be small, the fitting strength of the protruding part and the recessed part can be improved, and the size of the first electrode terminal assembly 30 and the second electrode terminal 32 as a whole can be reduced.

[0289] In some embodiments, along the width direction Y of the first housing wall, the first extension 61 and the second extension 62 have a first overlapping part 91, and the width direction Y of the first housing wall is the width direction of the first housing wall 11.

[0290] As shown in FIG. 24, along the width direction Y of the first housing wall, the first extension 61 and the second extension 62 have a part that overlaps each other, i.e., the part of the first extension 61 and the second extension 62 in the dashed box in the figure, which is referred to as the first overlapping part 91. Here, the first overlapping part 91 is not necessarily the part where the first extension 61 and the second extension 62 overlap and contact each other, including the case where the projection parts of the first extension 61 and the second extension 62 when each is projected onto the same projection plane along the width direction Y of the first housing wall are all coincident.

[0291] In this way, by setting the first extension 61 and the second extension 62 to overlap in the width direction Y of the first housing wall, the bending strength of the region of the first housing wall 11 where the electrode terminals are arranged can be improved by the synergistic effect of the two electrode terminals. Moreover, the first electrode terminal 31 and the second electrode terminal 32 can be arranged as compactly as possible, which is conducive to the use of the non-electrode terminal arrangement region of the first housing wall 11, and further conducive to improving the volume utilization rate of the battery pack.

[0292] In some embodiments, as shown in FIG. 24, the size of the first main body part 51 along the width direction Y of the first housing wall is B1, the size of the first extension along the width direction Y of the first housing wall is W1, and B1 is greater than or equal to W1; and / or, the size of the second main body part 52 along the width direction Y of the first housing wall is B2, the size of the second extension along the width direction Y of the first housing wall is W2, and B2 is greater than or equal to W2.

[0293] Optionally, the size B1 of the first main body part 51 along the width direction Y of the first housing wall is greater than or equal to the size W1 of the first extension along the width direction Y of the first housing wall.

[0294] In a case where the size B1 of the first main body portion 51 along the width direction Y of the first housing wall is equal to the size W1 of the first extension portion along the width direction Y of the first housing wall, the first terminal plate 311 can be configured as a rectangular thin plate with equal width. In this case, the portion where the first connecting post 313 is installed is taken as the first main body portion, and the remaining portion is taken as the first extension portion.

[0295] Optionally, the size B2 of the second main body portion 52 along the width direction Y of the first housing wall is greater than the size W2 of the second extension portion along the width direction Y of the first housing wall or equal to the size W2 of the second extension portion along the width direction Y of the first housing wall.

[0296] In a case where the size B2 of the second main body portion 52 along the width direction Y of the first housing wall is equal to the size W2 of the second extension portion 62 along the width direction Y of the first housing wall, the second terminal plate 321 can be configured as a rectangular thin plate with equal width. In this case, the portion where the second connecting post 323 is installed is taken as the second main body portion 52, and the remaining portion is taken as the second extension portion 62.

[0297] Therefore, the shape setting degree of freedom of the electrode terminal can be improved, the electrode terminal can be appropriately set according to the size of the first housing wall 11 (in particular, the size along the width direction Y of the first housing wall), and the compact arrangement of the two electrode terminals is also facilitated. Moreover, the first main body portion 51 and the second main body portion 52 are set to be relatively large, which is conducive to the installation of the connecting post in the first main body portion 51 and the second main body portion 52 and conducive to improving the installation stability of the electrode terminal relative to the first housing wall. The width of the first extension portion 61 and the second extension portion 62 along the width direction Y of the first housing wall is set to be relatively small, which is conducive to reducing the weight of the electrode terminal and even the battery monomer and the battery pack. Moreover, the first extension portion 61 and the second extension portion 62 can also be used to form the overflow bottle neck portion, thereby omitting the process of additionally processing the overflow bottle neck portion.

[0298] In some embodiments, the first extension portion 61 is arranged to be offset relative to the center position of the first main body portion 51 along the width direction Y of the first housing wall; and / or, the second extension portion 62 is arranged to be offset relative to the center position of the second main body portion 52 along the width direction Y of the first housing wall.

[0299] As shown in FIG. 25, the center position of the first main body portion 51 along the width direction Y of the first housing wall is represented by the position where the dashed line O is located, the center position of the first extension portion 61 along the width direction Y of the first housing wall is represented by the dashed line O1, and the center position of the second extension portion 62 along the width direction Y of the first housing wall is represented by the dashed line O2. Regarding the offset distance, it can be 15% to 27% of the width of the first housing wall 11.

[0300] Thus, the first extension portion and the second extension portion can be arranged in the width direction of the first housing wall by fully utilizing the size of the first housing wall in the width direction of the first housing wall, which is advantageous for compactly arranging the first electrode terminal and the second electrode terminal.

[0301] In some embodiments, as shown in FIG. 24, the size of the first housing wall 11 in the size direction X of the first housing wall is L, and the size of the first overlapping portion in the size direction of the first housing wall is A, which is in the range of 10% to 40% of L.

[0302] The size of the first housing wall 11 in the size direction X of the first housing wall refers to the maximum size of the outer contour of the first housing wall 11 in the size direction X of the first housing wall. A can be in the range of 10%, 20%, 25%, 30%, 35%, or 40% of L.

[0303] Thus, the first overlapping portion is set to be longer, which is advantageous for improving the strength of the electrode terminal arrangement area in the first housing wall and even the entire first housing wall.

[0304] In some embodiments, the length A of the first overlapping portion in the length direction of the first housing wall is in the range of 3 mm to 50 mm.

[0305] For example, A can be 3 mm, 5 mm, 8 mm, 10 mm, 15 mm, 20 mm, 30 mm, 40 mm, or 50 mm. It can also be other length values within the above range.

[0306] Thus, the first overlapping portion is set to be longer, which is advantageous for improving the strength of the electrode terminal arrangement area in the first housing wall and even the entire first housing wall.

[0307] In some embodiments, the first main body portion 51 and the second main body portion 52 have a second overlapping portion in the length direction X of the first housing wall.

[0308] The first main body portion 51 and the second main body portion 52 have overlapping portions that overlap each other in the length direction X of the first housing wall, which are referred to as second overlapping portions. Here, the second overlapping portions are not necessarily portions where the first main body portion 51 and the second main body portion 52 overlap and contact each other, and include cases where the respective projection portions or the entire projections of the first main body portion 51 and the second main body portion 52 coincide when projected onto the same projection plane in the length direction X of the first housing wall.

[0309] Thus, since the first housing wall has overlapping portions in both the length direction of the first housing wall and the width direction of the first housing wall, the first electrode terminal 31 and the second electrode terminal 32 can be compactly arranged in both the length direction of the first housing wall and the width direction of the first housing wall, and the bending strength of the first housing wall can be further improved.

[0310] In some embodiments, as shown in FIG. 24 and FIG. 25, the size of the first shell wall along the width direction Y of the first shell wall is W, and the size of the second overlapping portion along the width direction of the first shell wall is B, then B is in the range of 20% to 90% of W.

[0311] The size of the first shell wall 11 along the width direction Y of the first shell wall refers to the maximum size of the outer contour of the first shell wall 11 along the width direction Y of the first shell wall. B can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 60%, 70%, 75%, 80%, 90% of L. It can also be a proportion in the above range.

[0312] In this way, 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 improve the strength enhancement effect on the first shell wall.

[0313] In some embodiments, the closest distance between the first electrode terminal 31 and the second electrode terminal 32 along the length direction of the first shell wall and the width direction of the first shell wall is greater than or equal to 0.3 mm.

[0314] Here, the closest distance between the first electrode terminal 31 and the second electrode terminal 32 refers to the distance between the parts where the first electrode terminal 31 and the second electrode terminal 32 are closest to each other. The closest distance is greater than or equal to 0.3 mm, for example, it can be 0.3 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, etc. Generally, it is considered that in the case where there is an insulating member spacing between the parts where the first electrode terminal 31 and the second electrode terminal 32 are close to each other, it can be considered to be arranged closer, for example, the closest distance can be set to 0.3 mm or more. In the case where there is no insulating member spacing between the parts where the first electrode terminal 31 and the second electrode terminal 32 are close to each other, it is considered to be arranged slightly farther away, for example, the closest distance can be set to 2 mm or more.

[0315] In this way, the possibility of short-circuiting between the first electrode terminal and the second electrode terminal can be reduced.

[0316] In some embodiments, as shown in FIG. 22 and FIG. 25, the first electrode terminal 31 and the second electrode terminal 32 each include a connection area 93 for connecting with the busbar 2, the busbar 2 being used to electrically connect a plurality of battery monomers 10 with each other, and the connection area 93 is formed at least on the first overlapping portion 91 (see FIG. 24).

[0317] Here, the connection area 93 (the area shown with diagonal lines in FIG. 25) is the surface area of the first electrode terminal 31 and the second electrode terminal 32 that is connected with the busbar 2. The connection here includes welding, which can be ultrasonic welding, laser welding or other suitable welding methods.

[0318] In the embodiment shown in FIG. 22, the busbar 2 is configured in a rectangular thin plate shape, but is not limited to a rectangle and can be other suitable shapes, and is not limited to a plate shape and can be other suitable three-dimensional shapes.

[0319] Thus, the busbar 2 is connected to the part of the first electrode terminal 31 and the second electrode terminal 32 that forms the first overlapping part, and since this part has strong bending strength, even if the busbar causes bending stress to act on the first electrode terminal, the second electrode terminal, and the first housing wall, the first electrode terminal, the second electrode terminal, and the first housing wall are not easily bent and deformed, and are even less likely to break due to bending and deformation.

[0320] In some embodiments, as shown in FIG. 25, the connecting region is also formed in at least one of the first body part 51 and the second body part 52.

[0321] Thus, the connection strength between the electrode terminal and the busbar 2 can be further enhanced, the bending stress caused by the busbar 2 can be further dispersed, and the deformation resistance of the electrode terminal and the first housing wall 11 can be further improved.

[0322] In some embodiments, the material of the first body part 51 and / or the second body part 52 is different from the material of the first overlapping part 91.

[0323] For example, one of them can be made of aluminum, and the other can be made of copper. In some specific embodiments, for example, the material of the first body part 51 on the positive side can be set to a metal material with better heat conduction performance.

[0324] Thus, the material of the first body part 51 and the second body part 52 can be set according to the situation, which helps to reduce current loss, improve heat dissipation capacity, etc.

[0325] In some embodiments, as shown in FIG. 24, the length of the first housing wall in the length direction of the first housing wall is L, and L is less than or equal to 450 mm.

[0326] The length of the first housing wall 11 (which can also be the length of the battery monomer 10) can be less than or equal to 450 mm, for example, 450 mm, 400 mm, 350 mm, 300 mm, 250 mm, etc.

[0327] Thus, the electrode terminal can be arranged in the relatively narrow side wall of the strip-shaped battery monomer, improving the flexibility of the battery monomer group and facilitating large-area heat dissipation.

[0328] The second aspect of the present disclosure provides a battery. FIG. 27 is a cross-sectional view of a battery with a boss according to an embodiment of the present disclosure. As shown in FIG. 2, the battery 100 includes a case 20 and at least two battery cells 10 according to the first aspect of the present disclosure.

[0329] The battery cell 10 can be used alone or in combination with the above embodiments, which will not be described here.

[0330] Thus, a battery with a first shell wall with enhanced strength can be provided, which helps to improve the use reliability of the battery.

[0331] In some embodiments, as shown in FIG. 22, the battery cells 10 are arranged along the width direction of the first shell wall.

[0332] Thus, the volume utilization of the battery can be improved.

[0333] In some embodiments, the first electrode terminal assembly 30 includes a first electrode terminal 31 including a first main body portion 51 and a first extension portion 61 connected to each other, and a second electrode terminal 32 including a second main body portion 52 and a second extension portion 62 connected to each other, at least part of the first extension portion 61 and at least part of the second extension portion 62 are located between the first main body portion 51 and the second main body portion 52 along the length direction of the first shell wall, in adjacent battery cells, the first extension portion 61 of one battery cell 10 and the second extension portion 62 of another battery cell 10 are arranged along the width direction Y and are electrically connected by the busbar 2.

[0334] 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 site is strong, and thus the first electrode terminal 31, the second electrode terminal 32 and the first shell wall 11 are not easy to bend and deform or break, thereby improving the use reliability of the battery.

[0335] In some embodiments, in the same battery cell 10, the first extension portion 61 and the second extension portion 62 have a first overlapping portion 91 along the width direction of the first shell wall (see FIG. 24), and in adjacent battery cells 10, the first overlapping portion 91 of one battery cell and the first overlapping portion 91 of another battery cell are electrically connected by the busbar 2.

[0336] Thus, the busbar 2 is connected to the part of the first electrode terminal 31 and the second electrode terminal 32 where the first overlapping part 91 is formed, and since this part has strong bending resistance, even if the busbar 2 causes bending stress to act on the first electrode terminal 31, the second electrode terminal 32, and the first housing wall 11, the first electrode terminal 31, the second electrode terminal 32, and the first housing wall 11 are not easily bent and deformed, and are even less likely to break due to bending and deformation, thereby improving the use reliability of the battery.

[0337] In some embodiments, as shown in FIG. 27, at least one of the box walls of the box 20 has a boss 111a formed by bulging the box wall in a direction away from the battery monomer 10, the boss 111a forms a receiving part 111b on the side facing the battery monomer 10, and the projections of the first electrode terminal assembly 30 and the second electrode terminal 32 do not exceed the projection of the boss 111a along the direction perpendicular to the box wall where the boss 111a is formed, and the first electrode terminal assembly 30 and / or the second electrode terminal 32 are at least partially received in the receiving part 111b.

[0338] Thus, the height of the box at the position of the first electrode terminal assembly 30, the second electrode terminal 32, and the busbar 2 can be increased only, thereby reducing the size of the battery and also improving the volume utilization of the battery.

[0339] The third aspect of the present disclosure provides a power-using device, which comprises a plurality of the battery monomers provided in the first aspect or the battery provided in the second aspect, and the battery monomers or the battery supply power to the power-using device.

[0340] Thus, the power-using device provided with the battery monomer, the electrode terminal, and the shell of which are less likely to be bent and deformed or have less bending and deformation, the use reliability of the power-using device is improved, and the maintenance time of the power-using device is also reduced.

[0341] The fourth aspect of the present disclosure provides an energy storage device, and FIG. 26 is a structural schematic diagram of an energy storage device provided in an embodiment of the present disclosure.

[0342] The energy storage device 2000 comprises a plurality of the battery monomers provided in the first aspect or the battery 100 provided in the second aspect, and the battery monomers or the battery 100 are configured to store and supply electrical energy.

[0343] In a specific embodiment, as shown in FIG. 26, the energy storage device 2000 comprises a battery cabin and an electrical cabin 400, and a plurality of batteries 100 are arranged and placed in the battery cabin. The energy storage device 2000 can be an energy storage container or an energy storage cabinet.

[0344] Therefore, the energy storage device provided by the battery cell can reduce the bending deformation of the electrode terminal and the shell, improve the use reliability of the energy storage device, and reduce the maintenance time of the energy storage device.

[0345] The various embodiments / implementation provided by the present disclosure can be combined with each other without contradiction.

[0346] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. The present disclosure can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure. Industrial applicability

[0347] The present disclosure provides a battery cell, a battery, an electric device, and an energy storage device. Since the second electrode terminal in the battery cell is at least partially arranged between the first electrode terminal assembly and the first shell wall, the ability of the first electrode terminal assembly to support and fix the second electrode terminal can be improved, and the ability of the second electrode terminal to resist bending deformation can be improved. Moreover, the strength of the region of the first shell wall where the electrode terminal is arranged can be strengthened, thereby improving the ability of the electrode terminal and the shell of the battery cell to resist bending deformation.

Claims

1. A battery cell, wherein, The battery cell includes: a housing having a receiving space, the housing including a first housing wall; an electrode assembly disposed at least partially in the receiving space; a first electrode terminal assembly disposed at the first housing wall; a second electrode terminal disposed at the first housing wall; wherein at least a portion of the second electrode terminal is disposed between the first electrode terminal assembly and the first housing wall in a wall thickness direction of the first housing wall, and the first electrode terminal assembly abuts the second electrode terminal.

2. The battery cell according to claim 1, wherein 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, at least a portion of the second electrode terminal is disposed between the first insulating member and the first housing wall, and the first insulating member abuts the second electrode terminal.

3. The battery cell according to claim 2, wherein the electrode assembly includes first and second polar plates having opposite polarities, the first electrode terminal is electrically connected to the first polar plate, and the second electrode terminal is electrically connected to the second polar plate.

4. The battery cell according to claim 2 or 3, wherein the first insulating member is partially disposed between the first electrode terminal and the first housing wall.

5. The battery cell according to any one of claims 2 to 4, wherein in the wall thickness direction of the first housing wall, the first electrode terminal, the first insulating member, and the second electrode terminal partially overlap, and a portion of the first electrode terminal that overlaps the first insulating member and the second electrode terminal abuts the first insulating member.

6. The battery cell according to claim 5, wherein 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 that faces away from the receiving space, the second electrode terminal includes a second terminal plate, the second terminal plate is disposed on a side of the first housing wall that faces away from the receiving space, and the first insulating member is fixed to the first terminal plate; in the wall thickness direction of the first housing 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 housing wall, and the first terminal plate abuts the first insulating member.

7. The battery cell according to claim 6, wherein the first electrode terminal includes a first terminal disc, at least a portion of the first terminal disc is disposed on a side of the first housing wall that faces toward the receiving space, the second electrode terminal includes a second terminal disc, at least a portion of the second terminal disc is disposed on a side of the first housing wall that faces toward the receiving space, in the wall thickness direction of the first housing wall, the first terminal disc is at least partially disposed between the second terminal disc and the first housing wall; or in the wall thickness direction of the first housing wall, the second terminal disc is at least partially disposed between the first terminal disc and the first housing wall.

8. The battery cell according to claim 6, wherein 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 in a wall thickness direction of the first housing wall, and the first protrusion and the first recess are mutually fitted.

9. The battery cell according to claim 8, wherein The first recess includes a first step portion and a second step portion, and the second step portion is provided on a side of the first step portion away from the first electrode terminal assembly. The first protrusion includes a protruding portion provided on the first electrode terminal, and a portion of the second electrode terminal is located between the protruding portion and the first housing wall in the wall thickness direction of the first housing wall, and the protruding portion is at least partially accommodated in a step space formed by the first step portion. The first protrusion further includes a first covering portion provided on the first insulating member, and a portion of the second electrode terminal is located between the first covering portion and the first housing wall in the wall thickness direction of the first housing wall, and the first covering portion is at least partially accommodated in a step space formed by the second step portion.

10. The battery cell according to claim 9, wherein a surface of the first covering portion on a side away from the first housing wall does not exceed a surface of the first terminal plate on a side away from the housing wall in the wall thickness direction of the first housing wall; and / or a surface of the first covering portion on a side away from the first housing wall does not exceed a surface of the second terminal plate on a side away from the first housing wall in the wall thickness direction of the first housing wall.

11. The battery cell according to any one of claims 8 to 10, wherein a height difference between a surface of the first terminal plate on a side away from the housing wall and a surface of the second terminal plate on a side away from the first housing wall is greater than or equal to 0 and not more than 0.5 mm in the wall thickness direction of the first housing wall.

12. The battery cell according to any one of claims 8 to 11, wherein the first terminal plate includes a first main portion and a first extension portion connected to each other, the second terminal plate includes a second main portion and a second extension portion connected to each other, at least a portion of the first extension portion and at least a portion of the second extension portion are located between the first main portion and the second main portion in a length direction of the first housing wall, and the first extension portion and the second extension portion are arranged in a width direction of the first housing wall.

13. The battery cell according to claim 12, wherein the first extension portion and the second extension portion have a first overlapping portion in the width direction of the first housing wall.

14. The battery cell according to claim 13, wherein a material of the first main portion and / or the second main portion is different from a material of the first overlapping portion.

15. The battery cell according to any one of claims 12 to 14, wherein ​ The first electrode terminal further includes a first terminal disc, at least a portion of the first terminal disc being disposed on a side of the first housing wall facing the accommodation space, and the second electrode terminal further includes a second terminal disc, at least a portion of the second terminal disc being disposed on a side of the first housing wall facing the accommodation space, The first main body portion and the first terminal disc are directly connected by a first connecting column; The second main body portion and the second terminal disc are directly connected by a second connecting column.

16. The battery cell according to any one of claims 12 to 15, wherein The first recess portion is disposed on a side of the second extension portion facing the first electrode terminal, and the first protrusion portion is disposed on a side of the first main body portion facing the second electrode terminal.

17. The battery cell according to claim 16, wherein The first electrode terminal further includes a second recess portion, and the second electrode terminal further includes a second protrusion portion, the second protrusion portion at least partially overlapping the second recess portion in a wall thickness direction of the first housing wall, the second protrusion portion and the second recess portion being engaged with each other, The second recess portion is disposed on a side of the first extension portion facing the second electrode terminal, and the second protrusion portion is disposed on a side of the second main body portion facing the first electrode terminal.

18. The battery cell according to claim 17, wherein The second recess 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 protrusion portion includes a protruding portion provided by the second electrode terminal, a portion of the first electrode terminal being located between the protruding portion and the first housing wall in the wall thickness direction of the first housing wall, the protruding portion being at least partially accommodated in a step space formed by the third step portion; The second protrusion portion further includes a second covering portion provided by a second insulating member, a portion of the first electrode terminal being located between the second covering portion and the first housing wall in the wall thickness direction of the first housing wall, the second covering portion being at least partially accommodated in a step space formed by the fourth step portion.

19. The battery cell according to claim 15, wherein The first extension portion is connected to the first terminal disc by a third connecting column, The first recess portion is disposed on a side of the second extension portion facing the first electrode terminal, and the first protrusion portion is disposed on a side of the first extension portion facing the second electrode terminal.

20. The battery cell according to any one of claims 2 to 19, wherein 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.

21. The battery cell according to claim 20, wherein The first insulating member and the second insulating member are integrally formed.

22. The battery cell according to claim 20 or 21, wherein A first recess portion and a second recess portion are formed in the first housing wall, At least a portion of the first insulating member and at least a portion of the second insulating member are respectively positioned in the first recess and the second recess.

23. The battery cell according to claim 22, wherein The first recess and the second recess form the same recess.

24. The battery cell according to any one of claims 1 to 5, wherein The first electrode terminal assembly is provided with a first protrusion, the second electrode terminal is provided with a first recess, the first protrusion and the first recess at least partially overlap in a wall thickness direction of the first housing wall, and the first protrusion and the first recess cooperate with each other.

25. The battery cell according to any one of claims 1 to 5, wherein 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 provided on a side of the first housing wall facing away from the accommodation space, The second electrode terminal includes a second terminal plate, the second terminal plate is provided on a side of the first housing wall facing away from the accommodation space, In a wall thickness direction of the first housing wall, the first terminal plate and the second terminal plate partially overlap, and the first terminal plate directly or indirectly abuts against the second terminal plate.

26. The battery cell according to any one of claims 1 to 5, wherein 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 provided on a side of the first housing wall facing 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 provided on a side of the first housing wall facing away from the accommodation space, the second terminal plate includes a second main body portion and a second extension portion connected to each other, In a length direction of the first housing wall, at least a portion of the first extension portion and at least a portion of the second extension portion are positioned between the first main body portion and the second main body portion, and the first extension portion and the second extension portion are arranged in a width direction of the first housing wall.

27. The battery cell according to any one of claims 1 to 26, wherein In a wall thickness direction of the first housing wall, a portion where the first electrode terminal assembly and the second electrode terminal overlap is an overlapping region, A length of the overlapping region in a width direction of the first housing wall is W11, a length of the first housing wall in the width direction is W, W11 is in a range of 10% to 90% of W.

28. The battery cell according to claim 27, wherein W11 is in a range of 0.5 mm to 50 mm.

29. The battery cell according to any one of claims 1 to 28, wherein A length of the overlapping region in a length direction of the first housing wall is L11, L11 is in a range of 0.5 mm to 6 mm.

30. The battery cell according to any one of claims 12 to 19, 26, wherein The first main body portion has a dimension B1 along a width direction of the first housing wall, and the first extension portion has a dimension W1 along the width direction of the first housing wall, B1 being greater than or equal to W1; and / or, The second main body portion has a dimension B2 along a length direction of the first housing wall, and the second extension portion has a dimension W2 along the length direction of the first housing wall, B2 being greater than or equal to W2.

31. The battery cell of any one of claims 12-19, 26, 30, wherein, The first extension portion is arranged offset from a center position of the first main body portion along a width direction of the first housing wall; and / or, The second extension portion is arranged offset from a center position of the second main body portion along a width direction of the first housing wall.

32. The battery cell of any one of claims 13-31, wherein, The first housing wall has a length L along a length direction, and the first overlap portion has a dimension A along the length direction of the first housing wall, A being in a range of 10% to 40% of L.

33. The battery cell of claim 32, wherein, A is in a range of 3 mm to 50 mm.

34. The battery cell of any one of claims 13-33, wherein, The first main body portion and the second main body portion have a second overlap portion along a length direction of the first housing wall.

35. The battery cell of claim 34, wherein, The first housing wall has a dimension W along a width direction, and the second overlap portion has a dimension B along the width direction of the first housing wall, B being in a range of 20% to 90% of W.

36. The battery cell of any one of claims 1-35, wherein, A closest distance between the first electrode terminal and the second electrode terminal is greater than or equal to 0.3 mm along a length direction of the first housing wall and a width direction of the first housing wall.

37. The battery cell of any one of claims 13-36, wherein, The first electrode terminal and the second electrode terminal each include a connection region for connection with a busbar for electrically connecting a plurality of the battery cells to each other, the connection region being formed at least in the first overlap portion.

38. The battery cell of claim 37, wherein, The connection region is also formed in at least either of the first main body portion and the second main body portion.

39. The battery cell of any one of claims 1-38, wherein, The first housing wall has a length L along a length direction, L being less than or equal to 450 mm.

40. A battery, wherein, A battery including a case and at least two battery cells according to any one of claims 1-39.

41. The battery of claim 40, wherein, The battery cells are arranged along a width direction of the first housing wall.

42. The battery of claim 41, wherein, The first electrode terminal assembly includes a first electrode terminal including a first main body portion and a first extension portion connected to each other, The second electrode terminal includes a second main body portion and a second extension portion connected to each other, ​ At least a part of the first extension and at least a part of the second extension are located between the first body portion and the second body portion along a length direction of the first housing wall, In adjacent battery cells, the first extension of one battery cell and the second extension of another battery cell are arranged in the width direction and are electrically connected by a bus member.

43. The battery according to claim 42, wherein In the same battery cell, the first extension and the second extension have a first overlapping portion in the width direction of the first housing wall, In adjacent battery cells, the first overlapping portion of one battery cell and the first overlapping portion of another battery cell are electrically connected by the bus member.

44. The battery according to claim 42 or 43, wherein At least one of the box walls of the box has a boss formed by bulging of the box wall toward a direction away from the battery cell, the boss forms a receiving portion on a side toward the battery cell, Along a direction perpendicular to the box wall where the boss is formed, projections of the first electrode terminal assembly and the second electrode terminal do not exceed a projection of the boss, and the first electrode terminal assembly and / or the second electrode terminal are at least partially received in the receiving portion.

45. An electrical device, comprising: The electric device includes a plurality of battery cells according to any one of claims 1 to 39, or a battery according to any one of claims 40 to 44, and the battery cells or the battery supply power to the electric device.

46. An energy storage device, wherein, The energy storage device includes a plurality of battery cells according to any one of claims 1 to 39, or a battery according to any one of claims 40 to 44, and the battery cells or the battery store and supply power.

Images