Battery cell, battery, electrical apparatus, and energy storage apparatus

Abstract

A battery cell (10), a battery (100), an electrical apparatus, and an energy storage apparatus (2000). The battery cell (10) comprises: a casing (1) having an accommodating space, the casing (1) comprising a first casing wall (11); an electrode assembly arranged in the accommodating space; a first electrode terminal (31) arranged on the first casing wall (11), the first electrode terminal (31) comprising a first connecting part (61) connected to a first busbar member; and a second electrode terminal (32) arranged on the first casing wall (11), the second electrode terminal (32) comprising a second connecting part (62) connected to a second busbar member. The first connecting part (61) and the second connecting part (62) are arranged in the width direction of the first casing wall (11), projections of the first connecting part (61) and the second connecting part (62) in the width direction of the first casing wall (11) at least partially overlapping each other.

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 easy to bend and deform. In addition, the electrode terminal provided on the shell sometimes aggravates this tendency. Therefore, how to improve the strength of the shell wall of the battery cell in which the electrode terminal is provided 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 shell wall of the battery cell in which the electrode terminal is provided.

[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 provided in the accommodation space; and a first electrode terminal provided on the first shell wall, the first electrode terminal comprising a first connecting portion for connecting with a first bus member; a second electrode terminal provided on the first shell wall, the second electrode terminal comprising a second connecting portion for connecting with a second bus member; the first connecting portion and the second connecting portion are arranged along the width direction of the first shell wall, and the projection of the first connecting portion and the second connecting portion along the width direction of the first shell wall at least partially overlaps.

[0008] The battery cell in the embodiments of the present disclosure, since the first connecting part and the second connecting part are arranged along the width direction of the first shell wall and the projections along the width direction of the first shell wall overlap, the first electrode terminal and the second electrode terminal are arranged compactly, which helps to form a structure reinforcement with a larger area by mutual cooperation, thereby improving the structural strength of the first shell wall, in particular the bending strength. Since the first connecting part and the second connecting part are respectively used for connecting with the busbar, after a plurality of battery cells are arranged along the width direction of the first shell wall, the first connecting part and the second connecting part of adjacent battery cells are opposite to each other in position, which helps to shorten the connection path of the busbar.

[0009] In some embodiments, the first electrode terminal further comprises a first body part connected with the first connecting part, and the second electrode terminal further comprises a second body part connected with the second connecting part, and along the length direction of the first shell wall, at least part of the first connecting part and at least part of the second connecting part are located between the first body part and the second body part.

[0010] Since the first connecting part is connected with the first body part and the second connecting part is connected with the second body part, the force bearing area is further increased by the first body part and the second body part, and the bending strength of the first shell wall is improved. Since along the length direction of the first shell wall, the first connecting part and the second connecting part are located between the first body part and the second body part, and along the width direction of the first shell wall, the first connecting part and the second connecting part have an overlapping part, the bending strength of the region of the first shell wall where the electrode terminals are arranged can be improved by the synergistic effect of the two electrode terminals. Moreover, the first electrode terminal and the second electrode terminal can be arranged as compactly as possible, which is conducive to the utilization of the region of the first shell wall where no electrode terminal is arranged, and further conducive to improving the volume utilization rate of the battery pack.

[0011] In some embodiments, the length of the first body part along the width direction of the first shell wall is greater than or equal to the length of the first connecting part; and / or, the length of the second body part along the width direction of the first shell wall is greater than or equal to the length of the second connecting part.

[0012] Since the length of the first shell wall of the first main body part in the width direction is greater than or equal to the first connecting part, at least one side of the first shell wall of the first connecting part has a space, which helps to stagger the first connecting part and the second connecting part and other protruding structures, thereby improving the flexibility of the arrangement of the first electrode terminal, and helping to improve the space utilization on the first shell wall. Since the length of the first shell wall of the second main body part in the width direction is greater than or equal to the second connecting part, at least one side of the first shell wall of the second connecting part has a space, which helps to stagger the second connecting part and the first connecting part and other protruding structures, thereby improving the flexibility of the arrangement of the second electrode terminal, and helping to improve the space utilization on the first shell wall. Moreover, the first main body part and the second main body part are arranged to be larger, which is conducive to installing the connecting column in the first main body part and the second main body part, and is conducive to improving the installation stability of the electrode terminal relative to the first shell wall. The first connecting part and the second connecting part are arranged to be smaller in the width of the second direction, which is conducive to reducing the weight of the electrode terminal and even the battery monomer and the battery pack. Moreover, the first connecting part and the second connecting part can also be used to form an overflow bottleneck, thereby saving the process of additionally processing the overflow bottleneck.

[0013] In some embodiments, the first connecting part is arranged offset from the center position of the first main body part in the width direction of the first shell wall; and / or, the second connecting part is arranged offset from the center position of the second main body part in the width direction of the first shell wall.

[0014] Since the first connecting part is arranged offset from the center position of the first main body part in the width direction of the first shell wall, and the second connecting part is arranged offset from the center position of the second main body part in the width direction of the first shell wall, the staggered arrangement of the first connecting part and the second connecting part can not only make full use of the space, but also can make the first electrode terminal and the second electrode terminal arranged more concentratedly, thereby improving the strength of the area where the electrode terminal is located, and helping to reduce the risk of bending deformation of the area where the electrode terminal is located.

[0015] In some embodiments, the projection of the first main body part along the length direction of the first shell wall overlaps with the second connecting part, and / or, the projection of the second main body part along the length direction of the first shell wall overlaps with the first connecting part.

[0016] Thus, by arranging the first body portion and the second connecting portion to overlap in the length direction of the first shell wall, and / or the second body portion and the first connecting portion to overlap in the length direction of the first shell wall, the bending strength of the region of the first shell wall where the electrode terminals are arranged can be improved by the synergy of the two electrode terminals. Moreover, the first electrode terminal and the second electrode terminal can be arranged as compactly as possible, which is conducive to the utilization of the region of the first shell wall where no electrode terminal is arranged, and further conducive to the utilization of the volume of the battery pack. In some embodiments, a gap is formed between the first connecting portion and the first body portion, and the second connecting portion is at least partially located in the gap.

[0017] Thus, the second connecting portion fills the gap between the first connecting portion and the first body portion, and brings the second electrode terminal and the first electrode terminal close to each other, which on the one hand improves the strength of the region where the electrode terminals are arranged, and is conducive to reducing the risk of bending deformation of the region where the electrode terminals are arranged; and on the other hand, is conducive to the utilization of the region of the first shell wall where no electrode terminal is arranged, and further conducive to the utilization of the volume of the battery pack.

[0018] In some embodiments, the length of the first shell wall in the length direction of the first shell wall is L, the length of the first connecting portion in the length direction of the first shell wall is A1, and the length of the second connecting portion in the length direction of the first shell wall is A2, then 10%≤A1 / L≤40%, and / or 10%≤A2 / L≤40%.

[0019] By arranging A1 and / or A2 to be no less than 10% of L, the first overlapping portion can provide sufficient structural strength; and by arranging A1 and / or A2 to be no more than 40% of L, the material consumption of the first overlapping portion is controlled within a reasonable range.

[0020] In some embodiments, along the width direction of the first shell wall, the first connecting portion and the second connecting portion have a first overlapping portion, and the length of the first overlapping portion in the length direction of the first shell wall is within the range of 3mm to 50mm.

[0021] Thus, the first overlapping portion can take into account the strength requirement and save material.

[0022] In some embodiments, along the width direction of the first shell wall, the first body portion and the second body portion are located between the first connecting portion and the second connecting portion.

[0023] Thus, since the first main body part and the second main body part are located between the first connecting part and the second connecting part along the width direction of the first shell wall, the first electrode terminal and the second electrode terminal can be arranged as compactly as possible, which is conducive to the utilization of the non-electrode terminal arrangement region of the first shell wall, and further conducive to the utilization rate of the volume of the battery pack.

[0024] In some embodiments, along the length direction of the first shell wall, the first main body part and the second main body part have a second overlapping part, the length of the first shell wall along the width direction of the first shell wall is W, and the length of the second overlapping part along the width direction of the first shell wall is B, then B is in the range of 20% to 90% of W.

[0025] Thus, the second overlapping part can provide sufficient structural strength, and the two sides of the first shell wall along the width direction of the second overlapping part have space, which helps to reduce the risk of short circuit between the main body parts of adjacent battery monomers when a plurality of battery monomers are arranged along the width direction of the first shell wall.

[0026] In some embodiments, the length of the first main body part along the width direction of the first shell wall is B1, and the length of the second main body part along the width direction of the first shell wall is B2, then the absolute value of the difference between B1 and B2 is greater than or equal to 0 mm.

[0027] Thus, the length of the first shell wall along the width direction of the first main body part and the second main body part can be different.

[0028] In some embodiments, the absolute value of the difference between B1 and B2 is in the range of 0 mm to 50 mm.

[0029] In some embodiments, along the length direction of the first shell wall and the width direction of the first shell wall, the closest distance between the first electrode terminal and the second electrode terminal is greater than or equal to 0.3 mm.

[0030] Thus, the first electrode terminal and the second electrode terminal are separated by a safe distance, which helps to reduce the risk of accidental connection of the first electrode terminal and the second electrode terminal.

[0031] In some embodiments, along the length direction of the first shell wall and the width direction of the first shell wall, the closest distance between the first electrode terminal and the second electrode terminal is greater than or equal to 2.0 mm.

[0032] Thus, the first electrode terminal and the second electrode terminal are separated by a safe distance, which can reduce the risk of accidental connection of the first electrode terminal and the second electrode terminal even without using insulation or the like to isolate the two electrode terminals.

[0033] In some embodiments, the first electrode terminal and the second electrode terminal each include a connection region for connecting with a busbar for electrically connecting a plurality of the battery cells to each other.

[0034] Thus, the busbar electrically connects adjacent battery cells through the connection region.

[0035] In some embodiments, along a width direction of the first housing wall, the first connection portion and the second connection portion have a first overlap portion, and the connection region is formed at least in the first overlap portion.

[0036] Thus, the busbar connects at least the connection portions of adjacent battery cells, and after the battery cells are arranged, the first overlap portion extends in the same direction, and when the busbar connects the connection region in the first overlap portion, the connection path can be shortened, which helps to save the material of the busbar.

[0037] In some embodiments, the connection region is also formed in at least one of the first body portion and the second body portion.

[0038] Since the connection region is also formed in the first body portion, the first electrode terminal has a larger connection region area, which helps to improve the connection strength between the busbar and the first electrode terminal and to increase the overcurrent area. Since the connection region is also formed in the second body portion, the second electrode terminal has a larger connection region area, which helps to improve the connection strength between the busbar and the second electrode terminal and to increase the overcurrent area.

[0039] In some embodiments, the area of the connection region formed in the first overlap portion is SA, the total area of all the connection regions is S, and SA accounts for 50% to 100% of S.

[0040] Thus, the connection region can be arranged in the area of the non-connection portion in addition to the connection portion, the arrangement flexibility of the connection region is strong, which helps to increase the area of the connection region, improve the connection strength, and increase the overcurrent area.

[0041] In some embodiments, the offset distance of the center line position of the connection region formed in the first connection portion relative to the center line position of the first housing wall in the width direction of the first housing wall is B3, and B3 is in the range of 15% to 27% of W.

[0042] By setting B3 to be not less than 15% of W, the first connection portion is far enough from the center, which helps to separate the first connection portion and the second connection portion by a sufficient safety distance; by setting B3 to be not more than 27% of W, the first connection portion can be a certain distance from the edge of the first housing wall.

[0043] In some embodiments, the battery cell further comprises 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.

[0044] In this way, the first electrode terminal and the second electrode terminal can be 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 suitable strength, the bending deformation of the second electrode terminal can be limited by the first insulating member.

[0045] In some embodiments, the electrode assembly comprises 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.

[0046] In this way, the electrode terminals having opposite polarities can be arranged on the first shell wall of the battery cell, thereby facilitating reduction of the space occupied by the busbar and the like, and facilitating arrangement of other structural members such as heat exchange members on other shell walls of the battery cell, and improving the volume utilization of the battery.

[0047] In some embodiments, the first insulating member is partially arranged between the first electrode terminal and the first shell wall.

[0048] In this way, the first electrode terminal and the first shell wall can be insulated from each other.

[0049] 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.

[0050] 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 can be insulated from each other, thereby further strengthening the support and fixation of the first electrode terminal assembly to 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 improved, and the degree of freedom of the polarity of the electrode terminals is high.

[0051] 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 housing wall facing away from the accommodation space, the second electrode terminal includes a second terminal plate, the second terminal plate is disposed on a side of the first housing wall facing away from the accommodation space, the first insulating member is fixed to the first terminal plate; along a 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 against the first insulating member.

[0052] 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 housing wall facing away from the accommodation space, and the bending deformation of the second electrode terminal away from the first housing wall can be limited. Accordingly, the bending resistance of the region in the first housing wall is improved.

[0053] 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 housing wall facing away from the accommodation space, the second electrode terminal includes a second terminal plate, the second terminal plate is disposed on a side of the first housing wall facing away from the accommodation space, along a wall thickness direction of the first housing wall, the first terminal plate is at least partially disposed between the second terminal plate and the first housing wall; or, along the wall thickness direction of the first housing wall, the second terminal plate is at least partially disposed between the first terminal plate and the first housing wall.

[0054] 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 housing 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 housing wall from the inside and outside of the shell, and the bending strength of the first housing 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 housing wall.

[0055] 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 housing wall, and the first protrusion and the first recess cooperate with each other.

[0056] Thus, by matching the first protruding part and the first recessed part, the first electrode terminal can support and fix the second electrode terminal, improve the bending strength of the second electrode terminal, and facilitate processing; 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.

[0057] 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 an extending 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 extending part and the first shell wall, the extending part is at least partially accommodated in the stepped space formed by the first stepped part; the first protruding part further comprises a 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 covering part and the first shell wall, the covering part is at least partially accommodated in the stepped space formed by the second stepped part.

[0058] Thus, by matching the extending part and the first stepped part, the bending deformation of the second electrode terminal can be limited, and the extending part is at least partially accommodated in the first stepped part, so as to reduce the space occupied by the extending part and improve the space utilization. By arranging the covering part, the creepage distance on the surface of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, by accommodating the covering part in the stepped part, the covering part does not occupy additional space, thereby improving the space utilization.

[0059] In some embodiments, along the thickness direction of the first shell wall, the surface of the side of the covering part away from the first shell wall does not exceed the surface of the side of the first terminal plate away from the shell wall; and / or, along the thickness direction of the first shell wall, the surface of the side of the 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.

[0060] Since the surface of the side of the 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 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 covering part avoids interference with the busbar, facilitating reliable connection of the busbar and the like with the first terminal plate and the second terminal plate.

[0061] In some embodiments, the first electrode terminal is further provided with a second recess, the second electrode terminal is further provided with a second protrusion, the second protrusion at least partially overlaps with the second recess along the wall thickness direction of the first shell wall, the second protrusion and the second recess are matched with each other, the second recess is arranged on the side of the first connecting part facing the second electrode terminal, and the second protrusion is arranged on the side of the second main body part facing the first electrode terminal.

[0062] In this way, the second recess arranged on the first connecting part can be fixed between the second recess and the first shell wall by abutting against the second protrusion arranged on the second main body part, so that the first connecting part can be prevented from being bent away from the first shell wall to a certain extent due to the longer extension, and the bending strength of the first connecting part and the entire first electrode terminal is improved. Furthermore, the mutual supporting and fixing ability of the first electrode terminal assembly and the second electrode terminal is further enhanced. In this way, the first connecting part can be in reliable contact with the first shell wall even without being fixed to the first shell wall by a rivet, a connecting column or the like, and the risk of poor sealing caused by the installation of the rivet, the connecting column or the like can be reduced.

[0063] In some embodiments, the second recess includes a third step part and a fourth step part, the fourth step part is arranged on the side of the third step part away from the second electrode terminal; the second protrusion includes a protruding part arranged on the second electrode terminal, along the wall thickness direction of the first shell wall, a part of the first electrode terminal is located between the protruding part and the first shell wall, and the protruding part is at least partially accommodated in the step space formed by the third step part; the second protrusion further includes a second covering part arranged on the second insulating part, along the wall thickness direction of the first shell wall, a part of the first electrode terminal is located between the second covering part and the first shell wall, and the second covering part is at least partially accommodated in the step space formed by the fourth step part.

[0064] In this way, the bending deformation of the first electrode terminal can be limited by the cooperation between the protruding part and the third step part, and the protruding part is at least partially accommodated in the third step part to reduce the space occupied by the protruding part and improve the space utilization. By arranging the second covering part, 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. Furthermore, by accommodating the second covering part in the step part, the second covering part does not occupy additional space, so that the space utilization is improved.

[0065] In some embodiments, the battery monomer further includes a second insulating part, the second insulating part is at least partially arranged between the first terminal plate and the first shell wall.

[0066] Thus, the first electrode terminal can be insulated from the shell of the battery cell, and thus can be applied to a design scheme in which the shell is charged and a design scheme in which the shell is not charged.

[0067] In some embodiments, the first recess is arranged on a side of the second connecting portion facing the first electrode terminal, and the first protrusion is arranged on a side of the first main body portion facing the second electrode terminal.

[0068] Thus, the first recess arranged on the second connecting portion can be fixed between the first protrusion arranged on the first main body portion and the first shell wall by being abutted by the first protrusion, so that the second connecting portion can be prevented from being bent away from the first shell wall due to being too long, and the bending strength of the second connecting portion 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 easily bent or broken, and the connection reliability of the busbar and the electrode terminal is improved.

[0069] In some embodiments, a first recess and a second recess are formed in the first shell wall, and at least a portion of the first insulating member and at least a portion of the second insulating member are respectively located in the first recess and the second recess.

[0070] Thus, the installation strength of the insulating member with respect 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 with respect to each other during assembly is facilitated.

[0071] In some embodiments, the first connecting column is arranged on the first main body portion and connected to the first tab, the second connecting column is arranged on the second main body portion and connected to the second tab, and the material of the first main body portion and / or the second main body portion is different from the material of the first overlapping portion.

[0072] Thus, when the materials of the first tab and the second tab are different, the material of the main body portion can be selected according to the material of the tab to achieve a stronger conduction effect.

[0073] In some embodiments, the length of the first shell wall along the length direction of the first shell wall is L, and L is less than or equal to 450 mm.

[0074] Thus, the first shell wall has sufficient length to arrange the first electrode terminal and the second electrode terminal.

[0075] The second aspect of the present disclosure provides a battery including a box body and the battery cell provided by the first aspect.

[0076] Since the battery includes battery cells having strong structural strength, it is possible to improve the reliability of the battery in use, and to allow the battery to operate normally even after being subjected to jolts and impacts.

[0077] In some embodiments, the battery cells are arranged in the width direction of the first housing wall, and in adjacent battery cells, the first connecting portion of one battery cell and the second connecting portion of another battery cell at least partially overlap in the width direction of the first housing wall and are electrically connected by the bus bar.

[0078] Since the battery cells are arranged in the width direction of the first housing wall, and the first connecting portion and the second connecting portion at least partially overlap in the width direction of the first housing wall, the first connecting portion and the second connecting portion of adjacent battery cells are adjacent to each other. Since the first connecting portion and the second connecting portion of adjacent battery cells are connected by the bus bar and are adjacent to each other, it is possible to shorten and simplify the connection path of the bus bar and save the material of the bus bar.

[0079] In some embodiments, in adjacent battery cells, the first connecting portion of one battery cell and the second connecting portion of another battery cell are electrically connected by the bus bar.

[0080] Since the battery cells are arranged in the width direction of the first housing wall, the first overlapping portion of the first connecting portion and the first overlapping portion of the second connecting portion are arranged in the width direction of the first housing wall. By connecting the first overlapping portion of the first connecting portion of one battery cell and the first overlapping portion of the second connecting portion of another battery cell by the bus bar, the bus bar is arranged in the width direction of the first housing wall, which helps to shorten and simplify the connection path of the bus bar and save the material of the bus bar.

[0081] In some embodiments, in adjacent battery cells, at least one of the first main body portion of one battery cell and the second main body portion of another battery cell is electrically connected to the bus bar.

[0082] Since the bus bar can connect the main body portion in addition to the connecting portion, the bus bar and the electrode terminal can have a larger communication area, which helps to enhance the overcurrent capacity.

[0083] In some embodiments, at least one of the box walls of the box has a boss formed by bulging of the box wall in a direction away from the battery cell, the boss forms a receiving portion on a side facing the battery cell, the projections of the first electrode terminal and the second electrode terminal do not exceed the projection of the boss in a direction perpendicular to the box wall on which the boss is formed, and the first electrode terminal and / or the second electrode terminal is / are at least partially received in the receiving portion.

[0084] Thus, the height of the box at the position of the first electrode terminal and / or the second electrode terminal can be increased only, so that the size of the battery can be inhibited, and the volume utilization of the battery can also be improved.

[0085] The third aspect of the present disclosure provides a power utilization device, which comprises 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 utilization device.

[0086] Thus, the power utilization device can be adapted to the working conditions such as bumping, vibration and the like, and the stability of the working of the power utilization device can be improved.

[0087] The fourth aspect of the present disclosure provides an energy storage device, which comprises a plurality of the battery cell provided in the first aspect or the battery provided in the second aspect, and the battery cell or the battery is used for storing and providing electric energy.

[0088] Thus, the energy storage device can be adapted to the working conditions such as bumping, vibration and the like, and the stability of the energy storage of the energy storage device can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0089] FIG. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present disclosure;

[0090] FIG. 2 is a schematic diagram of an energy storage device according to an embodiment of the present disclosure;

[0091] FIG. 3 is a schematic diagram of a battery according to an embodiment of the present disclosure;

[0092] FIG. 4 is a perspective view of a battery cell according to an embodiment of the present disclosure;

[0093] FIG. 5 is a perspective view of a battery cell according to another embodiment of the present disclosure;

[0094] FIG. 6 is a perspective view of a battery cell according to still another embodiment of the present disclosure;

[0095] FIG. 7 is a side view of a battery cell according to an embodiment of the present disclosure;

[0096] FIG. 8 is a C-C cross-sectional view of FIG. 7;

[0097] FIG. 9 is a schematic view of forming a first recess and a second recess in a first shell wall according to an embodiment of the present disclosure;

[0098] FIG. 10 is an exploded view of a top cover of a battery cell according to an embodiment of the present disclosure;

[0099] FIG. 11 is a top view of a first shell wall according to an embodiment of the present disclosure;

[0100] FIG. 12 is a D-D sectional view of FIG. 11;

[0101] FIG. 13 is a partial enlarged view of an E portion of FIG. 12;

[0102] FIG. 14 is a top view of a first shell wall according to another embodiment of the present disclosure;

[0103] FIG. 15 is a top view of a first shell wall according to yet another embodiment of the present disclosure;

[0104] FIG. 16 is a schematic view of forming a connection region in an electrode terminal according to an embodiment of the present disclosure;

[0105] FIG. 17 is a schematic view of forming a connection region in an electrode terminal according to another embodiment of the present disclosure;

[0106] FIG. 18 is a perspective view of a busbar connecting adjacent battery cells according to an embodiment of the present disclosure;

[0107] FIG. 19 is a top view of a busbar connecting adjacent battery cells according to an embodiment of the present disclosure;

[0108] FIG. 20 is a perspective view of a busbar connecting adjacent battery cells according to another embodiment of the present disclosure;

[0109] FIG. 21 is a perspective view of a busbar connecting adjacent battery cells according to yet another embodiment of the present disclosure;

[0110] FIG. 22 is a perspective view of a battery cell according to still another embodiment of the present disclosure;

[0111] FIG. 23 is a schematic view of a battery provided with a boss according to an embodiment of the present disclosure;

[0112] FIG. 24 is a F-F sectional view of FIG. 23;

[0113] FIG. 25 is a schematic view of a battery cell provided with a first protrusion and a first recess according to an embodiment of the present disclosure;

[0114] FIG. 26 is a partial enlarged view of a G portion of FIG. 25;

[0115] FIG. 27 is a schematic view of a battery cell provided with a second protrusion according to an embodiment of the present disclosure;

[0116] Fig. 28 is a cross-sectional view taken along line H-H in Fig. 27;

[0117] Fig. 29 is an enlarged view of portion J in Fig. 28.

[0118] Reference signs 1000, vehicle; 2000, energy storage device; 100, battery; 200, controller; 300, motor; 10, battery cell; 20, case; 1, housing; 11, first housing wall; 111, first recess; 112, second recess; 2, busbar; 31, first electrode terminal; 311, first terminal disc; 312, first connecting post; 314, first protrusion; 315, first recessed portion; 3151, first step portion; 3152, second step portion; 317, second recessed portion; 3171, third step portion; 3172, fourth step portion; 32, second electrode terminal; 321, second terminal disc; 322, second connecting post; 327, second protrusion; 41, first terminal plate; 42, second terminal plate; 51, first main body portion; 52, second main body portion; 61, first connecting portion; 62, second connecting portion; 71, first tab; 72, second tab; 81, first insulating member; 811, first cover portion; 82, second insulating member; 821, second cover portion; 91, first overlapping portion; 92, second overlapping portion; 93, connection region; X, length direction of first housing wall; Y, width direction of first housing wall; Z, wall thickness direction of first housing wall; 1111a, boss; 1111b, accommodating portion. DETAILED DESCRIPTION

[0119] 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.

[0120] 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 terms "comprising" and "having," and any variations thereof, as used herein are intended to cover a non-exclusive inclusion.

[0121] 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, in addition, batteries are also increasingly used in the field of energy storage and the like.

[0122] 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 easy to bend. In addition, the electrode terminal provided on the shell may aggravate this tendency. Therefore, how to improve the strength of the shell wall of the battery monomer provided with the electrode terminal is one of the research directions of the industry.

[0123] Through research, it is found that by centrally arranging the pole relative to the shell wall, it is helpful to form a larger structural reinforcement together, thereby improving the structural strength of the shell wall where the electrode terminal is located, especially the bending strength.

[0124] Based on such a technical concept, the battery monomer provided by the present disclosure comprises: a shell having an accommodation space, the shell comprising a first shell wall; an electrode assembly provided in the accommodation space; and a first electrode terminal provided on the first shell wall, the first electrode terminal comprising a first connecting portion connected with a first busbar; a second electrode terminal provided on the first shell wall, the second electrode terminal comprising a second connecting portion connected with a second busbar; the first connecting portion and the second connecting portion are arranged along the width direction of the first shell wall, and the projection of the first connecting portion and the second connecting portion along the width direction of the first shell wall at least partially overlaps.

[0125] Since the first connecting portion and the second connecting portion are arranged along the width direction of the first shell wall, and the projection along the width direction of the first shell wall overlaps, the first electrode terminal and the second electrode terminal are arranged in a relatively concentrated position, which is helpful to form a larger structural reinforcement together, thereby improving the structural strength of the first shell wall, especially the bending strength. Since the first connecting portion and the second connecting portion are respectively used for connecting with the busbar, after a plurality of battery monomers are arranged along the width direction of the first shell wall, the first connecting portion and the second connecting portion of adjacent battery monomers are opposite to each other, which is helpful to shorten the connection path of the busbar.

[0126] The battery monomer of the present disclosure can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. The battery monomer, the battery, etc. of the present disclosure can be used to form a power supply system of the electric device.

[0127] The battery monomer provided by the present disclosure can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft.

[0128] The battery monomer provided by the present disclosure can also be used as a battery (sometimes also referred to as a battery pack) in groups. The battery can also be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft.

[0129] The embodiments of the present disclosure further provide a power utilization device comprising the battery cell or the battery, which can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0130] The embodiments of the present disclosure further provide an energy storage device comprising the battery cell or the battery, which can include an energy storage container, an energy storage cabinet, etc.

[0131] Hereinafter, for the convenience of description, a power utilization device of an embodiment of the present disclosure is taken as a vehicle 1000 for example to be described.

[0132] FIG. 1 is a structural schematic diagram of the vehicle 1000 provided by an embodiment of the present disclosure. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. As shown in FIG. 21, 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, the controller 200 being used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0133] 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.

[0134] In the present disclosure, the battery includes a plurality of battery cells. The battery cell refers to a basic unit capable of realizing mutual conversion between chemical energy and electrical energy, and can be used to make a battery module or a battery pack, thereby being used to supply power to a power utilization device. The battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging. The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., which are not limited in the present disclosure.

[0135] A battery cell generally includes an electrode assembly. The electrode assembly includes a cathode, an anode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are intercalated and deintercalated between the cathode and the anode. The separator is disposed between the cathode and the anode, and can prevent the cathode and the anode from shorting while allowing the active ions to pass through.

[0136] In some embodiments, the battery cell further includes an electrolyte. The electrolyte can conduct ions between the cathode and the anode. The type of electrolyte is not particularly limited in the present disclosure and can be selected as desired. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0137] In some embodiments, the battery cell can include a housing. The housing can be used to encapsulate the electrode assembly and other components such as the electrolyte. The housing can be a steel case, an aluminum case, a plastic case (e.g., polypropylene), a composite metal case (e.g., a copper-aluminum composite case), or an aluminum-plastic film, among others.

[0138] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing can protect the electrode assembly, and a sealing bag can be included between the housing and the electrode assembly to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film.

[0139] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of another shape. The prismatic battery cell can include a square battery cell, a blade battery cell, a multi-prismatic battery cell (e.g., a hexagonal battery cell), among others.

[0140] In some embodiments, the housing includes a cap and a case. The case can be provided with one or more openings, and the cap can close the openings to form a sealed space for accommodating the electrode assembly and the electrolyte, among others. The case can be provided with one or more openings. The cap can also be provided with one or more openings.

[0141] In some embodiments, the housing can be provided with at least one electrode terminal (also referred to as a “pole”). The electrode terminal can be electrically connected to the tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter component. The electrode terminal can be provided on the cap or on the case. In some embodiments, the housing can be provided with a pressure relief mechanism. The pressure relief mechanism can be used to release the internal pressure of the battery cell.

[0142] In embodiments of the present disclosure, the battery can also be a single physical module (e.g., a battery module or a battery pack) that includes one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in a mixed connection.

[0143] 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.

[0144] 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 appearance 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 other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0145] 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 means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0146] In the description of the embodiments of the disclosure, for the convenience of description, the direction of arrow X is the "length direction of the first shell wall", the direction of arrow Y is the "width direction of the first shell wall", and the direction of arrow Z is the "wall thickness direction of the first shell wall".

[0147] 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 mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the disclosure can be understood according to the specific circumstances.

[0148] In the description of the disclosure, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without mutual force, or contact between two objects in contact with mutual force.

[0149] Some embodiments of the disclosure will be described in detail below with reference to the accompanying drawings.

[0150] FIG. 3 is a schematic view of a battery according to an embodiment of the present disclosure; FIG. 4 is a perspective view of a battery cell according to an embodiment of the present disclosure; FIG. 5 is a perspective view of a battery cell according to another embodiment of the present disclosure; FIG. 6 is a perspective view of a battery cell according to yet another embodiment of the present disclosure; FIG. 7 is a side view of a battery cell according to an embodiment of the present disclosure; FIG. 8 is a cross-sectional view of C-C in FIG. 7; FIG. 9 is a schematic view of a first housing wall in which a first recess and a second recess are formed according to an embodiment of the present disclosure; FIG. 10 is an exploded view of a top cover of a battery cell according to an embodiment of the present disclosure; FIG. 11 is a top view of a first housing wall according to an embodiment of the present disclosure; FIG. 12 is a cross-sectional view of D-D in FIG. 11; FIG. 13 is a partial enlarged view of E portion in FIG. 12; FIG. 14 is a top view of a first housing wall according to another embodiment of the present disclosure; FIG. 15 is a top view of a first housing wall according to yet another embodiment of the present disclosure; FIG. 16 is a schematic view of an electrode terminal in which a connection region is formed according to an embodiment of the present disclosure; FIG. 17 is a schematic view of an electrode terminal in which a connection region is formed according to another embodiment of the present disclosure; FIG. 18 is a perspective view of a busbar connecting adjacent battery cells according to an embodiment of the present disclosure; FIG. 19 is a top view of a busbar connecting adjacent battery cells according to an embodiment of the present disclosure; FIG. 20 is a perspective view of a busbar connecting adjacent battery cells according to another embodiment of the present disclosure; FIG. 21 is a perspective view of a busbar connecting adjacent battery cells according to yet another embodiment of the present disclosure; FIG. 22 is a perspective view of a battery cell according to still another embodiment of the present disclosure; FIG. 23 is a schematic view of a battery provided with a boss according to an embodiment of the present disclosure; FIG. 24 is a cross-sectional view of F-F in FIG. 23; FIG. 25 is a schematic view of a battery cell provided with a first protrusion and a first recess according to an embodiment of the present disclosure; FIG. 26 is a partial enlarged view of G portion in FIG. 25; FIG. 27 is a schematic view of a battery cell provided with a second protrusion according to an embodiment of the present disclosure; FIG. 28 is a cross-sectional view of H-H in FIG. 27; FIG. 29 is a partial enlarged view of J portion in FIG. 28.

[0151] In a first aspect, the present disclosure provides a battery cell. As shown in FIG. 4, the battery cell 10 includes: a housing 1 having a receiving space, the housing 1 including a first housing wall 11; an electrode assembly disposed in the receiving space; and a first electrode terminal 31 disposed on the first housing wall 11, the first electrode terminal 31 including a first connection portion 61 connected to a first busbar; a second electrode terminal 32 disposed on the first housing wall 11, the second electrode terminal 32 including a second connection portion 62 connected to a second busbar; the first connection portion 61 and the second connection portion 62 are arranged along a width direction Y of the first housing wall of the battery cell 10, and a projection of the first connection portion 61 along the width direction Y of the first housing wall at least partially overlaps with a projection of the second connection portion 62 along the width direction Y of the first housing wall.

[0152] The battery cell 10 includes a case 1. The case 1 is composed of a plurality of case walls that enclose a space for accommodation. Specifically, the case 1 includes a case body and a top cover. The case body is configured as a box 20 with one side open, the box 20 having a space for accommodation inside, in which a bare cell is placed. The top cover is connected to the case body and closes the opening, and the top cover serves as a first case wall 11. Optionally, a round or chamfered corner is configured at the connection of adjacent case walls. The case walls can be configured as flat surfaces or curved surfaces, and the present disclosure does not make any special limitation on the shape of the case walls.

[0153] The battery cell 10 further includes an electrode assembly. The electrode assembly is located in the space for accommodation. The electrode assembly includes electrode tabs and a separator. The electrode tabs are provided in two, a positive electrode tab and a negative electrode tab. During charging and discharging of the battery cell, active ions (e.g. lithium ions) are intercalated and deintercalated between the positive and negative electrodes. The separator is provided between the positive and negative electrode tabs, and can serve to prevent short circuiting of the positive and negative electrodes while allowing the active ions to pass through. The electrode assembly is not limited to a jelly-roll type, and can be, for example, a stacked plate type or other structural forms.

[0154] The electrode assembly is provided with tabs that can lead current out of the electrode assembly. The tabs include a first tab 71 and a second tab 72, which are provided on the same side of the electrode assembly along a third direction Z and are both provided near one end of the electrode assembly along a first direction X. Of course, the first tab 71 and the second tab 72 can also be provided on opposite sides of the electrode assembly; the first tab 71 and the second tab 72 can also be provided near both ends of the electrode assembly along the first direction X, respectively.

[0155] The battery cell 10 further includes electrode terminals that are electrically connected to the electrode assembly to allow current to flow between the battery cell 10 and an external electrical device or a charging device. The electrode terminals are provided in two, a first electrode terminal 31 and a second electrode terminal 32. The first electrode terminal 31 and the second electrode terminal 32 are both provided on the same case wall, i.e. the first electrode terminal 31 and the second electrode terminal 32 are both provided on the first case wall 11. The first electrode terminal 31 is electrically connected to the first tab 71 or the second tab 72 through the first case wall 11, and the second electrode terminal 32 is electrically connected to the first tab 71 or the second tab 72 through the first case wall 11.

[0156] The width direction Y of the first case wall of the battery cell 10 refers to the direction in which the shortest side of the first case wall 11 is located, and can be the direction in which the shortest side of the battery cell 10 is located. If the first case wall 11 is configured as a square, the width direction Y of the first case wall is the direction in which any side of the first case wall 11 is located.

[0157] The first connecting portion 61 and the second connecting portion 62 are arranged along the width direction Y of the first shell wall of the battery monomer 10 and are spaced apart by a certain distance to avoid the first electrode terminal 31 and the second electrode terminal 32 from being in conduction. The projection of the first connecting portion 61 and the second connecting portion 62 along the width direction Y of the first shell wall at least partially overlaps. The first connecting portion 61 has a surface parallel to the first shell wall 11, and the second connecting portion 62 has a surface parallel to the first shell wall 11, and the two surfaces are located on the same horizontal plane to share external forces.

[0158] In the battery monomer 10 in the embodiments of the present disclosure, the first connecting portion 61 and the second connecting portion 62 are arranged along the width direction Y of the first shell wall of the battery monomer 10 and the projections along the width direction Y of the first shell wall overlap, so that the first electrode terminal 31 and the second electrode terminal 32 are arranged in a concentrated and compact manner, which helps to form a structure reinforcing member with a larger area by cooperation, thereby improving the structural strength of the first shell wall. Since the first connecting portion 61 and the second connecting portion 62 are respectively used to connect the busbar 2, after a plurality of battery monomers 10 are arranged along the width direction Y of the first shell wall, the first connecting portion 61 and the second connecting portion 62 of adjacent battery monomers 10 are opposite to each other, which helps to shorten the connection path of the busbar 2.

[0159] In addition, since the electrode assembly is arranged in the accommodation space, the shell 1 can protect the electrode assembly. Since the first shell wall 11 is provided with the first electrode terminal 31 and the second electrode terminal 32, the electrode assembly can be connected with the outside through the electrode terminal.

[0160] In some embodiments, as shown in FIGS. 5, 14 and 15, the first electrode terminal 31 further includes a first body portion 51 connected with the first connecting portion 61, and the second electrode terminal 32 further includes a second body portion 52 connected with the second connecting portion 62, and along the length direction X of the first shell wall of the battery monomer 10, at least part of the first connecting portion 61 and at least part of the second connecting portion 62 are located between the first body portion 51 and the second body portion 52.

[0161] The length direction X of the first shell wall of the battery monomer 10 refers to the direction in which the longest side of the first shell wall 11 is located, which is perpendicular to the width direction Y of the first shell wall of the battery monomer 10.

[0162] The first electrode terminal 31 further includes a first body portion 51. Along the length direction X of the first shell wall of the battery monomer 10, the first body portion 51 is arranged on one side of the first connecting portion 61. The first body portion 51 and the first connecting portion 61 can be an integral structure or a separate structure. The first body portion 51 and the first connecting portion 61 are connected with each other and in conduction.

[0163] The second electrode terminal 32 further comprises a second body portion 52. The second body portion 52 is arranged at a side of the second connecting portion 62 away from the first body portion 51 along the length direction X of the first shell wall of the battery cell 10. The second body portion 52 and the second connecting portion 62 can be an integral structure or a separate structure. The second body portion 52 and the second connecting portion 62 are connected to each other and conductive.

[0164] The first body portion 51 and the second body portion 52 are arranged along the length direction X of the first shell wall, and a projection of the length direction X of the first shell wall of the first body portion 51 can at least partially overlap the second body portion 52 or be located outside the second body portion 52. A projection of the width direction Y of the first shell wall of the first body portion 51 is located outside the second body portion 52.

[0165] The first body portion 51 and the second body portion 52 can be respectively configured in a rectangular shape, a circular shape, etc., and the present disclosure does not make any special limitation on the specific shape of the first body portion 51. The first body portion 51 and the second body portion 52 can be configured in the same shape and / or size or different shapes and / or sizes.

[0166] The first connecting portion 61 and the first body portion 51 are connected and conductive, and the second connecting portion 62 and the second body portion 52 are connected and conductive. Along the length direction X of the first shell wall, the first connecting portion 61 is connected to the side of the first body portion 51 close to the second body portion 52, and the second connecting portion 62 is connected to the side of the second body portion 52 close to the first body portion 51, so that the first connecting portion 61 and the second connecting portion 62 are located between the first body portion 51 and the second body portion 52. The first connecting portion 61 and the second connecting portion 62 are spaced apart by a distance to avoid the first electrode terminal 31 and the second electrode terminal 32 being conductive. Along the width direction Y of the first shell wall, a projection of the first connecting portion 61 partially overlaps the second connecting portion 62, and the overlapping part is a first overlapping part 91.

[0167] The first connecting portion 61 and the second connecting portion 62 can be respectively configured in a rectangular shape extending along the length direction X of the first shell wall, a wave shape bending along the width direction Y of the first shell wall, or a triangular shape tapering away from the first body portion 51, and the present disclosure does not make any special limitation on the specific shape of the first connecting portion 61 and the second connecting portion 62. The second connecting portion 62 can be configured in the same shape and / or size as the first connecting portion 61 or different shapes and / or sizes from the first connecting portion 61.

[0168] Since the first connecting portion 61 is connected with the first body portion 51, and the second connecting portion 62 is connected with the second body portion 52, the first body portion 51 and the second body portion 52 further increase the force receiving area, and improve the bending strength of the first shell wall. Since the first connecting portion 61 and the second connecting portion 62 are located between the first body portion 51 and the second body portion 52 along the length direction X of the first shell wall, and the first connecting portion 61 and the second connecting portion 62 have overlapping portions along the width direction Y of the first shell wall, the bending strength of the region of the first shell wall where the electrode terminals are arranged can be improved by the synergistic effect of the two electrode terminals. Moreover, the first electrode terminal and the second electrode terminal can be arranged as compact as possible, which is beneficial to the utilization of the region of the first shell wall where no electrode terminal is arranged, and further beneficial to the utilization of the volume of the battery pack.

[0169] In some embodiments, as shown in FIG. 6, the length of the first body portion 51 along the width direction Y of the first shell wall is greater than or equal to the length of the first connecting portion 61; and / or, the length of the second body portion 52 along the width direction Y of the first shell wall is greater than or equal to the length of the second connecting portion 62.

[0170] The length of the first body portion 51 along the width direction Y of the first shell wall is the maximum length of the outermost contour of the first body portion 51 along the width direction Y of the first shell wall, denoted as B1. The length of the first connecting portion 61 along the width direction Y of the first shell wall is the maximum length of the outermost contour of the first connecting portion 61 along the width direction Y of the first shell wall, denoted as W1. Along the width direction Y of the first shell wall, the length of the first body portion 51 is greater than or equal to the length of the first connecting portion 61, i.e., B1≥W1, and the projection of the first connecting portion 61 along the length direction X of the first shell wall is located within the first body portion 51.

[0171] The length of the second body portion 52 along the width direction Y of the first shell wall is the maximum length of the outermost contour of the second body portion 52 along the width direction Y of the first shell wall, denoted as B2. The length of the second connecting portion 62 along the width direction Y of the first shell wall is the maximum length of the outermost contour of the second connecting portion 62 along the width direction Y of the first shell wall, denoted as W2. Along the width direction Y of the first shell wall, the length of the second body portion 52 is greater than or equal to the length of the second connecting portion 62, i.e., B2≥W2, and the projection of the second connecting portion 62 along the length direction X of the first shell wall is located within the second body portion 52.

[0172] In one embodiment, the projection of the length direction X of the first housing wall of the first main body portion 51 and the second main body portion 52 at least partially overlap, and in order to avoid the first connecting portion 61 and the second connecting portion 62 from contacting, the length of the width direction Y of the first housing wall of the first connecting portion 61 is set to be smaller than that of the first main body portion 51 (W1 < B1), and the length of the width direction Y of the first housing wall of the second connecting portion 62 is set to be smaller than that of the second main body portion 52 (W2 < B2), so that the edge of the first connecting portion 61 close to the second connecting portion 62 is spaced apart from the edge of the second connecting portion 62 close to the first connecting portion 61 by a distance.

[0173] In another embodiment, the projection of the length direction X of the first housing wall of the first main body portion 51 is located outside the second main body portion 52. Optionally, the length of the width direction Y of the first housing wall of the first connecting portion 61 is set to be equal to that of the first main body portion 51 (W1 = B1), and the length of the width direction Y of the first housing wall of the second connecting portion 62 is set to be equal to that of the second main body portion 52 (W2 = B2). Also optionally, the length of the width direction Y of the first housing wall of the first connecting portion 61 is set to be equal to that of the first main body portion 51 (W1 = B1), and the length of the width direction Y of the first housing wall of the second connecting portion 62 is set to be smaller than that of the second main body portion 52 (W2 < B2). Also optionally, the length of the width direction Y of the first housing wall of the second connecting portion 62 is set to be equal to that of the second main body portion 52 (W2 = B2), and the length of the width direction Y of the first housing wall of the first connecting portion 61 is set to be smaller than that of the first main body portion 51 (W1 < B1).

[0174] Since the length of the width direction Y of the first housing wall of the first main body 51 is greater than or equal to that of the first connecting portion 61, at least one side of the width direction Y of the first housing wall of the first connecting portion 61 has space. This space helps to stagger the protruding structures such as the first connecting portion 61 and the second connecting portion 62, thereby improving the flexibility of the arrangement of the first electrode terminal 31 and improving the space utilization rate on the first housing wall 11. Since the length of the width direction Y of the first housing wall of the second main body 52 is greater than or equal to that of the second connecting portion 62, at least one side of the width direction Y of the first housing wall of the second connecting portion 62 has space. This space helps to stagger the protruding structures such as the second connecting portion 62 and the first connecting portion 61, thereby improving the flexibility of the arrangement of the second electrode terminal 32 and improving the space utilization rate on the first housing wall 11. Furthermore, making the first and second main bodies larger facilitates the installation of connecting posts on the first and second main bodies, which helps to improve the installation stability of the electrode terminals relative to the first housing wall. Making the width of the first and second connecting portions along the second direction smaller helps to reduce the weight of the electrode terminals and even the battery cells and battery pack. Furthermore, the first connecting part and the second connecting part can be used to form the flow bottleneck part, thereby eliminating the need for additional processing of the flow bottleneck part.

[0175] In some embodiments, as shown in FIG14, the first connecting portion 61 is 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 connecting portion 62 is offset relative to the center position of the second main body portion 52 along the width direction Y of the first housing wall.

[0176] When the projection of the length direction X of the first housing wall of the first main body 51 is outside the second main body 52, the first connecting part 61 can be disposed at any position on the side of the first main body 51 near the second main body 52, and the second connecting part 62 can be disposed at any position on the side of the second main body 52 near the first main body 51. For example, the first connecting part 61 can be disposed at the center or off-center of the first main body 51, and / or the second connecting part 62 can be disposed at the center or off-center of the second main body 52.

[0177] When the projection of the length direction X of the first housing wall of the first main body 51 and the second main body 52 overlap, the first connecting portion 61 and the second connecting portion 62 need to be arranged away from each other. Alternatively, the first connecting portion 61 and the second connecting portion 62 are respectively configured in a shape extending along the length direction X of the first housing wall, such as a rectangle, a curve, etc. The first connecting portion 61 is arranged offset from the central position of the first main body 51, leaving space on one side of the width direction Y of the first housing wall of the first connecting portion 61, and the second connecting portion 62 occupies part of the space and is arranged on the second main body 52. The second connecting portion 62 can be arranged offset from the central position of the second main body 52.

[0178] Alternatively, as shown in FIG. 15, the first connecting portion 61 and the second connecting portion 62 are respectively configured in a shape tapering along the length direction X of the first housing wall, such as a trapezoid, a triangle, etc. The length of the first connecting portion 61 in the width direction Y of the first housing wall is arranged to be smaller as it is closer to the second main body 52, and the length of the second connecting portion 62 in the width direction Y of the first housing wall is arranged to be smaller as it is closer to the first main body 51. The first connecting portion 61 and the second connecting portion 62 are arranged at a distance away from each other, and the first connecting portion 61 can be arranged at any position on the side of the first main body 51 close to the second main body 52, and the second connecting portion 62 can be arranged at any position on the side of the second main body 52 close to the first main body 51.

[0179] Since the first connecting portion 61 is arranged offset from the central position of the first main body 51 along the width direction Y of the first housing wall, and the second connecting portion 62 is arranged offset from the central position of the second main body 52 along the width direction Y of the first housing wall, the first connecting portion 61 and the second connecting portion 62 are arranged staggered from each other, which can make full use of the space, and can make the first electrode terminal 31 and the second electrode terminal 32 arranged more concentratedly, thereby improving the strength of the area where the electrode terminals are located, and being beneficial to reducing the risk of bending deformation of the area where the electrode terminals are located.

[0180] In some embodiments, the first main body 51 and the second connecting portion 62 partially overlap along the length direction of the first housing wall, and / or the second main body 52 and the first connecting portion 61 partially overlap along the length direction X of the first housing wall.

[0181] The first main body 51 and the second main body 52 are arranged relatively compactly along the length direction X of the first housing wall, that is, the distance between the first main body 51 and the second connecting portion 62 is relatively close, and the distance between the second main body 52 and the first connecting portion 61 is relatively close.

[0182] Thus, by arranging the first body portion 51 and the second connecting portion 62 to overlap in the length direction of the first housing wall, and / or the second body portion 52 and the first connecting portion 61 to overlap in the length direction of the first housing wall, the bending strength of the region of the first housing wall in which the electrode terminals are arranged can be improved using the synergy 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 advantageous for the utilization of the region of the first housing wall in which no electrode terminals are arranged, and further advantageous for the volumetric utilization of the battery pack.

[0183] In some embodiments, a gap is formed between the first connecting portion 61 and the first body portion 51, and the second connecting portion 62 is at least partially located in the gap.

[0184] Optionally, the first connecting portion 61 is arranged to be offset from the center of the first body portion 51, such that one side of the first connecting portion 61 in the width direction Y of the first housing wall is left as a space, which is regarded as a gap between the first connecting portion 61 and the first body portion 51, and the second connecting portion 62 is arranged on the second body portion 52 occupying part of the gap. The first connecting portion 61 can be configured in any shape, and one side of the first connecting portion 61 in the width direction Y of the first housing wall is left as a space.

[0185] Optionally, the second connecting portion 62 is arranged to be offset from the center of the second body portion 52, such that one side of the second connecting portion 62 in the width direction Y of the first housing wall is left as a space, which is regarded as a gap between the second connecting portion 62 and the second body portion 52, and the first connecting portion 61 is arranged on the first body portion 51 occupying part of the gap.

[0186] Thus, the second connecting portion 62 fills the gap between the first connecting portion 61 and the first body portion 51, and brings the second electrode terminal and the first electrode terminal closer to each other, which on the one hand improves the strength of the region in which the electrode terminals are arranged, and is advantageous for reducing the risk of bending deformation of the region in which the electrode terminals are arranged; and on the other hand, is advantageous for the utilization of the region of the first housing wall in which no electrode terminals are arranged, and further advantageous for the volumetric utilization of the battery pack.

[0187] In some embodiments, as shown in FIG. 22, the length of the first housing wall 11 in the length direction X of the first housing wall is L, the length of the first connecting portion 61 in the length direction X of the first housing wall is A1, and the length of the second connecting portion 62 in the length direction X of the first housing wall is A2, then 10%≤A1 / L≤40%, and / or 10%≤A2 / L≤40%.

[0188] L represents the length of the outermost contour of the first housing wall 11 in the length direction X of the first housing wall.

[0189] A1 represents a length of an outermost contour of the first connecting portion 61 along the length direction X of the first housing wall.

[0190] A2 represents a length of an outermost contour of the second connecting portion 62 along the length direction X of the first housing wall.

[0191] The ratio of A1 to L is in a range of 10% to 40%, and the ratio of A2 to L is in a range of 10% to 40%.

[0192] By setting A1 and / or A2 to be not less than 10% of L, the first overlapping portion 91 is able to provide sufficient structural strength; by setting A1 and / or A2 to be not more than 40% of L, the material consumption of the first overlapping portion 91 is controlled within a reasonable range.

[0193] In some embodiments, as shown in FIGS. 4 to 6, along the width direction Y of the first housing wall, the first connecting portion 61 and the second connecting portion 62 have a first overlapping portion, and a length of the first overlapping portion 91 along the length direction X of the first housing wall is in a range of 3mm to 50mm.

[0194] A represents a length of an outermost contour edge of the first overlapping portion along the length direction X of the first housing wall.

[0195] In other words, 3mm≤A≤50mm. Optionally, the length of the first overlapping portion 91 along the length direction X of the first housing wall can be 3mm, 5mm, 10mm, 20mm, 30mm, 40mm, or 50mm.

[0196] In this way, the first overlapping portion 91 is able to meet the strength requirement and save material consumption.

[0197] In some embodiments, as shown in FIG. 15, along the width direction Y of the first housing wall, the first main body portion 51 and the second main body portion 52 are located between the first connecting portion 61 and the second connecting portion 62.

[0198] The first main body portion 51 and the second main body portion 52 are arranged along the length direction X of the first housing wall and are spaced apart from each other. The first main body portion 51 and the second main body portion 52 are located between the first connecting portion 61 and the second connecting portion 62.

[0199] Along the width direction Y of the first housing wall, the outer edge of the second main body portion 52 (the edge close to the long side of the first housing wall 11) is substantially flush with the outer edge of the first connecting portion 61, and the outer edge of the first main body portion 51 (the edge close to the long side of the first housing wall 11) is substantially flush with the outer edge of the second connecting portion 62. However, it is also possible that the outer edges are not flush. Alternatively, one of the outer edges of the second main body portion 52 and the outer edge of the first connecting portion 61 is closer to the long side of the first housing wall 11, and / or one of the outer edges of the first main body portion 51 and the outer edge of the second connecting portion 62 is closer to the long side of the first housing wall 11.

[0200] In one embodiment, the first main body portion 51 and the second main body portion 52 are configured to have the same length along the width direction Y of the first housing wall, and the projection of the first main body portion 51 on the length direction X of the first housing wall and the second main body portion 52 completely overlap. The length of the second overlap portion 92 along the width direction Y of the first housing wall is the same as the length of the first main body portion 51 and the length of the second main body portion 52.

[0201] In another embodiment, the first main body portion 51 and the second main body portion 52 are configured to have different lengths along the width direction Y of the first housing wall. Alternatively, the projection of the first main body portion 51 on the length direction X of the first housing wall is located within the second main body portion 52; the length of the second overlap portion 92 along the width direction Y of the first housing wall is the same as the length of the first main body portion 51. Alternatively, the projection of the second main body portion 52 on the length direction X of the first housing wall is located within the first main body portion 51; the length of the second overlap portion 92 along the width direction Y of the first housing wall is the same as the length of the second main body portion 52.

[0202] Thus, since there is an overlap portion in both the first direction and the second direction, the first electrode terminal and the second electrode terminal can be arranged compactly in both the first direction and the second direction, and the bending strength of the first housing wall can be further improved. The first main body portion 51 and the second main body portion 52 are distributed more centrally, which helps to share external forces together and thus improves the structural strength and reduces the risk of excessive deformation.

[0203] In some embodiments, continuing to refer to FIG. 15, the length of the first housing wall 11 along the width direction Y of the first housing wall is W, and the length of the second overlap portion 92 along the width direction Y of the first housing wall is B, then B is in the range of 20% to 90% of W.

[0204] W represents the length of the outermost contour of the first housing wall 11 along the width direction Y of the first housing wall.

[0205] B represents the length of the outermost contour of the second overlap portion 92 along the width direction Y of the first housing wall.

[0206] The first casing wall of the first body portion 51 and the second body portion 52 overlap in the length direction X of the first casing wall along the length direction X of the first casing wall. The overlap is a second overlap portion 92.

[0207] The ratio of B to W is in a range of 20% to 90%. After the battery cells 10 are arranged, a distance is required between the electrode terminals on adjacent battery cells 10, and therefore, the first electrode terminal 31 and the second electrode terminal 32 each need to be spaced apart from the profile of the first casing wall 11. Optionally, the length of the first body portion 51 along the width direction Y of the first casing wall is not greater than 90% of W, and the length of the second body portion 52 along the width direction Y of the first casing wall is not greater than 90% of W. Further, the length of the first connecting portion 61 along the width direction Y of the first casing wall is not greater than 90% of W, and the length of the second connecting portion 62 along the width direction Y of the first casing wall is not greater than 90% of W.

[0208] In this way, the second overlap portion 92 can provide sufficient structural strength, and the two sides of the width direction Y of the first casing wall of the second overlap portion 92 can be left with space, which helps to avoid the main body portions of adjacent battery cells 10 from being in contact and conducting when the plurality of battery cells 10 are arranged along the width direction Y of the first casing wall.

[0209] In some embodiments, as shown in FIG. 6, the length of the first body portion 51 along the width direction Y of the first casing wall is B1, and the length of the second body portion 52 along the width direction Y of the first casing wall is B2. The absolute value of the difference between B1 and B2 is greater than or equal to 0 mm.

[0210] B1 represents the length of the outermost profile of the first body portion 51 along the width direction Y of the first casing wall.

[0211] B2 represents the length of the outermost profile of the second body portion 52 along the width direction Y of the first casing wall.

[0212] The sizes of the first electrode terminal 31 and the second electrode terminal 32 can be configured to be the same or different.

[0213] When the first electrode terminal 31 and the second electrode terminal 32 are configured to be different sizes, the absolute value of the difference between B1 and B2 is greater than 0 mm, i.e., |B1-B2|>0 mm; and / or the absolute value of the difference between the length of the first body portion 51 along the length direction X of the first casing wall and the length of the second body portion 52 along the length direction X of the first casing wall is greater than 0 mm.

[0214] When the first electrode terminal 31 and the second electrode terminal 32 are configured to have the same size, the absolute value of the difference between B1 and B2 is equal to 0 mm, i.e., |B1-B2|=0 mm; and the absolute value of the difference between the length of the first body part 51 along the length direction X of the first housing wall and the length of the second body part 52 along the length direction X of the first housing wall is equal to 0 mm.

[0215] Thus, the length of the first housing wall of the first body part 51 and the second body part 52 in the width direction Y can not be the same.

[0216] In some embodiments, continuing to refer to FIG. 6, the absolute value of the difference between B1 and B2 is in the range of 0 mm to 50 mm.

[0217] Alternatively, the absolute value of the difference between B1 and B2 can be 0 mm, 3 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, or 50 mm.

[0218] Thus, a reasonable size difference range is provided.

[0219] In some embodiments, the closest distance between the first pole and the second pole along the length direction X of the first housing wall and the width direction Y of the first housing wall is greater than or equal to 0.3 mm.

[0220] Thus, a safe distance is provided between the first electrode terminal 31 and the second electrode terminal 32, which helps to reduce the risk of accidental connection of the first electrode terminal 31 and the second electrode terminal 32.

[0221] In some embodiments, the closest distance between the first pole and the second pole along the length direction X of the first housing wall and the width direction Y of the first housing wall is greater than or equal to 2.0 mm.

[0222] Thus, a safe distance is provided between the first electrode terminal 31 and the second electrode terminal 32, which helps to reduce the risk of accidental connection of the first electrode terminal 31 and the second electrode terminal 32, even without using an insulating member or the like to isolate the two electrode terminals.

[0223] In some embodiments, as shown in FIGS. 11-13, the first terminal plate 41 is provided with a first protruding part 314, and the second terminal plate 42 is provided with a first recessed part 315, the first protruding part 314 and the first recessed part 315 at least partially overlap in the wall thickness direction of the first housing wall, and the first protruding part 314 and the first recessed part 315 cooperate with each other.

[0224] The first protruding part 314 refers to a part of structure protruding from the first electrode terminal 31 and entering into the outer contour of the second electrode terminal 32. The first recessed part 315 refers to a recess formed with respect to the surface of the second electrode terminal 32 and capable of accommodating the first protruding part 314. The recess can be formed by a groove or by a step. In the case of being formed by a step, it can include a one-step, or a two-step or more steps.

[0225] Here, the first protruding part 314 and the first recessed part 315 in the mutual cooperation state can at least limit the displacement of each other in the wall thickness direction Z of the first shell wall. Optionally, the first protruding part 314 and the first recessed part 315 in the mutual cooperation state can also limit the displacement of each other in the length direction X of the first shell wall and / or the width direction Y of the first shell wall.

[0226] 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 is reduced, and the space utilization is improved.

[0227] In some embodiments, as shown in FIG. 13, FIG. 25 and FIG. 26, the battery monomer further comprises a first insulating part 81, which is arranged at least partially between the first terminal plate and the first shell wall 11.

[0228] The battery monomer 10 further comprises a first insulating part 81. The extension direction of the first insulating part 81 is parallel to the first shell wall 11, and the first insulating part 81 is arranged at least between the first electrode terminal 31 and the first shell wall 11, for separating the first electrode terminal 31 and the first shell wall 11. Optionally, the first insulating part 81 is configured in a frame type, and the extension direction of a part of the first insulating part 81 is perpendicular to the first shell wall 11, which part surrounds the surface of the first electrode terminal 31 perpendicular to the first shell wall 11. Further, the first insulating part 81 protrudes from the edge of the first electrode terminal 31 to the center of the first electrode terminal 31, covering the part of the surface of the first electrode terminal 31 away from the first shell wall 11, and limiting the first electrode terminal 31 within the first insulating part 81.

[0229] In one embodiment, the first insulating member 81 is arranged between the first electrode terminal 31 and the first housing wall 11, and between the first electrode terminal 31 and the second electrode terminal 32. The first insulating member 81 between the first electrode terminal 31 and the second electrode terminal 32 is bent and extends towards the second electrode terminal 32, covering a part of the surface of the second electrode terminal 32 away from the first housing wall 11, so that the second electrode terminal 32 is partially located between the first insulating member 81 and the first housing wall 11. Further, the first insulating member 81 between the first electrode terminal 31 and the second electrode terminal 32 is also bent and extends towards the first electrode terminal 31, covering a part of the surface of the first electrode terminal 31 away from the first housing wall 11, so that the first electrode terminal 31 is partially located between the first insulating member 81 and the first housing wall 11.

[0230] The first protruding portion 314 includes a structure protruding from the first electrode terminal 31, and also includes a structure protruding from the first insulating member 81. In the case where a part of the first insulating member 81 (for example, the first covering portion 811) abuts against the second electrode terminal 32 to limit the bending deformation, the part of the first insulating member 81 (for example, the first covering portion 811) corresponds to the first protruding portion 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 the bending deformation, the first protruding portion 314 includes a part protruding from the second electrode terminal 32 and a part protruding from the first insulating member 81.

[0231] Thus, the second electrode terminal can be insulated from the housing of the battery cell.

[0232] In some embodiments, continuing to refer to FIG. 13, the first recessed portion 315 includes a first stepped portion 3151 and a second stepped portion 3152, the second stepped portion 3152 being arranged on a side of the first stepped portion 3151 away from the first electrode terminal assembly 30; the first protruding portion includes an extending portion provided by the first electrode terminal 31, along the thickness direction of the first housing wall, a part of the second electrode terminal 32 is located between the extending portion and the first housing wall 11, and the extending portion is at least partially accommodated in a stepped space formed by the first stepped portion 3151; the first protruding portion 314 further includes a first covering portion 811 provided by the first insulating member 81, along the thickness direction of the first housing wall 11, a part of the second electrode terminal 32 is located between the first covering portion 811 and the first housing wall 11, and the first covering portion 811 is at least partially accommodated in a stepped space formed by the second stepped portion 3152.

[0233] The first step portion 3151 is formed by a portion of the second terminal plate 42 that is lowered in the wall thickness direction of the first housing wall 11 toward the side facing away from the first housing wall 11, as in the portion of the second terminal plate 42 in the dashed line frame on the left 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.

[0234] Here, the first protruding portion 314 includes the protruding portion and the first cover portion 811; and the first recessed portion 315 includes the first step portion 3151 and the second step portion 3152.

[0235] The first step portion 3151 is formed on the side surface of the second electrode terminal 32 in the wall thickness direction of the first housing wall 11 facing 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 the surface of the protruding portion in contact with the recessed portion, so that in a state in which the protruding portion is inserted into the first step portion 3151, the first insulating member 81 is sandwiched between the protruding portion and the first step portion 3151, so that an insulating state can be maintained.

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

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

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

[0240] Thus, the bending deformation of the second electrode terminal 32 can be limited by the cooperation of the protruding portion and the first step portion 3151, and the protruding portion is further at least partially accommodated in the first step portion 3151, so as to reduce the space occupied by the protruding portion and improve the space utilization. By arranging the first covering portion 811, the creepage distance on the surface of the first electrode terminal 31 and the second electrode terminal 32 can be increased, and the insulation reliability can be improved. Moreover, by accommodating the first covering portion 811 in the second step portion 3152, the covering portion does not occupy extra space, so as to improve the space utilization.

[0241] In some embodiments, the battery monomer further comprises a second insulating member 82, which is at least partially arranged between the first terminal plate and the first shell wall 11.

[0242] The second electrode terminal 32 and the first shell wall 11 can have an insulating member therebetween, or no insulating member is arranged therebetween.

[0243] Optionally, the second electrode terminal 32 is connected with the negative tab, no insulating member is arranged between the second electrode terminal 32 and the first shell wall 11, and the first shell wall 11 or even the entire shell 1 is negatively charged.

[0244] Optionally, the second electrode terminal 32 is connected with the positive tab or the negative tab, and the second electrode terminal 32 and the first shell wall 11 have a second insulating member 82 therebetween, so that the first shell wall 11 or even the entire shell 1 is insulated from the second electrode terminal 32 and is not charged.

[0245] Thus, the first electrode terminal and the shell of the battery monomer can also be insulated, so that the design scheme of the charged shell can be applied, and the design scheme of the uncharged shell can also be applied.

[0246] In some embodiments, as shown in FIGS. 7, 8, 10-13, the battery monomer 10 further comprises a first insulating member 81, which is at least partially arranged between the first electrode terminal 31 and the first shell wall 11, and the second electrode terminal 32 is at least partially arranged between the first insulating member 81 and the first shell wall 11.

[0247] In some embodiments, continuing to refer to FIGS. 7, 8, 10-13, the battery monomer 10 further comprises a second insulating member 82, which is at least partially arranged between the second electrode terminal 32 and the first shell wall 11.

[0248] The battery cell 10 further comprises a second insulating member 82. The second insulating member 82 extends parallel to the first housing wall 11, and is arranged at least between the second electrode terminal 32 and the first housing wall 11 to insulate the second electrode terminal 32 from the first housing wall 11. Optionally, the second insulating member 82 is configured in a frame shape, and a portion of the second insulating member 82 extends perpendicular to the first housing wall 11, and surrounds a surface of the second electrode terminal 32 that is perpendicular to the first housing wall 11. Further, the second insulating member 82 extends from an edge of the second electrode terminal 32 to a center of the second electrode terminal 32, and covers a portion of the second electrode terminal 32 that is away from the first housing wall 11, and limits the second electrode terminal 32 within the second insulating member 82.

[0249] Thus, the second electrode terminal 32 is insulated from the first housing wall 11, and the second electrode terminal 32 is prevented from directly contacting the housing 1 to charge the housing 1.

[0250] In some embodiments, as shown in FIGS. 9 and 10, the first housing wall 11 is formed with a first recess and a second recess, at least a portion of the first insulating member 81 is recessed into the first recess, and at least a portion of the second insulating member 82 is recessed into the second recess. The first recess and the second recess are independent recesses, or the first recess and the second recess are connected to form a complete recess.

[0251] The first housing wall 11 is formed with a first recess and a second recess that are recessed toward the accommodation space. At least a portion of the first insulating member 81 is recessed into the first recess, and the first recess limits the first insulating member 81 from all around. At least a portion of the second insulating member 82 is recessed into the second recess, and the second recess limits the second insulating member 82 from all around.

[0252] The first recess and the second recess can have the same or different recess depths. The first recess and the second recess can be independent recesses, or can be connected to form a complete recess. There can be multiple recesses, and optionally, there are recesses arranged on both sides of the first insulating member 81 and / or the second insulating member 82 along the length direction X of the first housing wall of the battery cell 10.

[0253] In an optional embodiment, the first housing wall 11 is formed with a protrusion that faces away from the accommodation space, and the protrusion is configured in a frame shape. The first insulating member 81 and / or the second insulating member 82 is arranged in the frame-shaped protrusion, and the frame-shaped protrusion limits the first insulating member 81 and / or the second insulating member 82.

[0254] Since the first recess is formed on the first housing wall 11 and at least a portion of the first insulating member 81 is trapped in the first recess, the first recess can limit the first insulating member 81, which helps to maintain a stable insulation effect between the first electrode terminal 31 and the shell 1. Since the second recess is formed on the first housing wall 11 and at least a portion of the second insulating member 82 is trapped in the second recess, the second recess can limit the second insulating member 82, which helps to maintain a stable insulation effect between the second electrode terminal 32 and the shell 1.

[0255] In some embodiments, as shown in FIGS. 16-21, the first electrode terminal 31 and the second electrode terminal 32 each include a connection region 93 for connecting with the bus member 2, which is used to electrically connect the plurality of battery monomers 10 with each other.

[0256] The connection region 93 refers to a region where the bus member 2 is welded with the first electrode terminal 31 and the second electrode terminal 32, respectively.

[0257] The bus member 2 is welded with the connection region 93 of the first electrode terminal 31 of one battery monomer 10 and the connection region 93 of the second electrode terminal 32 of another battery monomer 10, respectively, to achieve electrical connection between adjacent battery monomers 10.

[0258] The connection region 93 can be in any shape such as rectangular, square, trapezoidal, etc., and the present disclosure does not make any special limitation on the shape of the connection region 93. The connection region 93 can be arranged at any position of the first electrode terminal 31 away from the surface of the first housing wall 11, and the connection region 93 can be arranged at any position of the second electrode terminal 32 away from the surface of the first housing wall 11.

[0259] In this way, the bus member 2 electrically connects adjacent battery monomers 10 through the connection region 93.

[0260] In some embodiments, as shown in FIGS. 16 and 17, along the width direction Y of the first housing wall, the first connecting portion 61 and the second connecting portion 62 have a first overlapping portion 91, and the connection region 93 is formed at least in the first overlapping portion 91.

[0261] When the plurality of battery monomers 10 are arranged along the width direction Y of the first housing wall, the first connecting portion 61 and the second connecting portion 62 are arranged alternately along the width direction Y of the first housing wall, and the first overlapping portion 91 on each battery monomer 10 overlaps along the width direction Y of the first housing wall, i.e., the connection line of each first overlapping portion 91 is parallel to the width direction Y of the first housing wall. The connection region 93 is formed in the first overlapping portion 91, and the bus member 2 connects the connection regions 93 on two adjacent battery monomers 10 in a straight line, and the connection line of each bus member 2 is parallel to the width direction Y of the first housing wall.

[0262] Thus, the busbar 2 connects at least the connecting portions of the adjacent battery cells 10, and after the battery cells 10 are arranged, the first overlapping portion 91 extends in the same direction, and when the busbar 2 is connected to the connecting region 93 located in the first overlapping portion 91, the connecting path can be shortened, which helps to save the material of the busbar 2.

[0263] In some embodiments, continuing to refer to FIG. 16 and FIG. 17, the connecting region 93 is also formed in at least one of the first body portion 51 and the second body portion 52.

[0264] The greater the area of the connecting region 93, the greater the flow area of the busbar 2 and the electrode terminal, and the stronger the flow capacity. The connecting region 93 can be formed in the first body portion 51 and / or the second body portion 52.

[0265] Since the connecting region 93 is also formed in the first body portion 51, the first electrode terminal 31 has a greater area of the connecting region 93, which helps to improve the connection strength of the busbar 2 and the first electrode terminal 31 and increase the flow area. Since the connecting region 93 is also formed in the second body portion 52, the second electrode terminal 32 has a greater area of the connecting region 93, which helps to improve the connection strength of the busbar 2 and the second electrode terminal 32 and increase the flow area.

[0266] In some embodiments, as shown in FIG. 17, the area of the connecting region 93 formed in the first overlapping portion 91 is SA, and the total area of the connecting region 93 is S, and SA accounts for 50% to 100% of S.

[0267] SA represents the area of the connecting region 93 formed in the first overlapping portion 91.

[0268] S represents the total area of the connecting region 93.

[0269] The ratio of SA to S is in the range of 50% to 100%, that is, 50%≤SA / S≤100%.

[0270] If the connecting region 93 is only provided in the first overlapping portion 91, the ratio of SA to S is 100%.

[0271] Thus, the connecting region 93 can be provided in the area of the non-connecting portion in addition to being provided in the connecting portion, and the connecting region 93 has strong flexibility in the arrangement, which helps to increase the area of the connecting region 93, improve the connection strength, and increase the flow area.

[0272] In some embodiments, as shown in FIG. 14, the center line position of the connecting region 93 formed in the first connecting portion 61 in the width direction Y of the first housing wall is offset from the center line position of the first housing wall 11 in the width direction Y of the first housing wall by a distance B3, and B3 is in the range of 15% to 27% of W.

[0273] B3 represents the offset distance of the center line position of the connecting region 93 of the first connecting portion 61 formed on the first housing wall in the width direction Y of the first housing wall relative to the center line position of the first housing wall 11 in the width direction Y of the first housing wall.

[0274] The ratio of B3 to W is in the range of 15% to 27%, i.e., 15%≤B3 / W≤27%.

[0275] By setting B3 to be no less than 15% of W, the first connecting portion 61 is provided with sufficient distance from the center, thereby helping to keep a sufficient safety distance between the first connecting portion 61 and the second connecting portion 62; by setting B3 to be no more than 27% of W, the first connecting portion 61 can be provided with a certain distance from the edge of the first housing wall 11.

[0276] In some embodiments, as shown in FIGS. 7, 8 and 10, the first electrode terminal assembly 30 includes the first electrode terminal 31 and the first insulating member 81, the first insulating member 81 is fixed with the first electrode terminal 31, the second electrode terminal 32 is at least partially arranged between the first insulating member 81 and the first housing wall 11, and the first insulating member 81 abuts against the second electrode terminal 32.

[0277] The first electrode terminal assembly includes the first electrode terminal 31 and the first insulating member 81 fixed with each other, and the fixing manner can be one of the following: integrally injection molded, bonded, fastened together by connecting columns, etc.

[0278] In some specific embodiments, the surface of the second electrode terminal 32 located between the first insulating member 81 and the first housing wall 11 and 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 insulating member 81 located between the first insulating member 81 and the first housing wall 11 and close to the first housing wall 11 in the wall thickness direction Z of the first housing wall.

[0279] In some specific embodiments, the first insulating member 81 is not located between the first electrode terminal 31 and the second electrode terminal 32, i.e., the first electrode terminal 31 is not pressed against the side of the first insulating member 81 away from the first housing wall 11. The side of the first insulating member 81 facing the first housing wall 11 abuts against the side of the second electrode terminal 32 away from the first housing wall 11, i.e., the bending deformation of the second electrode terminal 32 is limited by the part of the first insulating member 81. Here, the first insulating member 81 has a suitable bending strength.

[0280] The first insulating member 81 is at least used to insulate the second electrode terminal 32 from the first electrode terminal 31, and can also be used to insulate the first electrode terminal 31 from the first housing wall 11.

[0281] In some embodiments, the first electrode terminal 31 and the second electrode terminal 32 are made of a conductive metal material, such as copper or aluminum; and the first insulating member 81 is made of a plastic material.

[0282] In some embodiments, the electrode assembly includes first and second polar plates of opposite polarity, 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.

[0283] The first and second polar plates are led out by the tabs and are directly or indirectly connected to the electrode terminals. As shown in FIG. 3, the tabs include a first tab 71 and a second tab 72.

[0284] In some embodiments, the first insulating member 81 is partially disposed between the first electrode terminal 31 and the first housing wall 11. Optionally, the first electrode terminal 31 and the second electrode terminal 32 are connected to positive and negative tabs, respectively, and are of opposite polarity, and the second electrode terminal 32 is at least partially disposed between the first insulating member 81 and the first housing wall 11. Further optionally, the first insulating member 81 is disposed between the entire first electrode terminal 31 and the first housing wall 11, and a portion of the first insulating member 81 is disposed between the first electrode terminal 31 and the first housing wall 11.

[0285] Optionally, the first electrode terminal 31 and the second electrode terminal 32 are connected to the same tab among the positive and negative tabs and are of the same polarity, and no insulating member is disposed between the first electrode terminal 31 and the second electrode terminal 32. Optionally, the second electrode terminal 32 is at least partially disposed between the first electrode terminal 31 and the first housing wall 11. Further optionally, the first insulating member 81 is disposed between the entire first electrode terminal 31 and the first housing wall 11, and the first electrode terminal 31 is disposed between the first insulating member 81 and the first housing wall 11.

[0286] In this way, the first electrode terminal 31 can be insulated from the housing 1 of the battery cell, and the first electrode terminal 31 and the second electrode terminal 32 can also be insulated from each other, so that even if the first electrode terminal 31 and the second electrode terminal 32 are of opposite polarity, they can cooperate with each other to improve the bending resistance of each electrode terminal, and the design freedom of the electrode terminal on the housing of the battery cell is improved. Moreover, in the case where the first insulating member 81 has a suitable strength, the bending deformation of the second electrode terminal 32 can be limited by the first insulating member 81.

[0287] In some embodiments, as shown in FIGS. 12 and 13, 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 housing wall 11, and the portion of the first electrode terminal 31 that overlaps the first insulating member 81 and the second electrode terminal 32 abuts against the first insulating member 81.

[0288] The first electrode terminal 31 abuts against the first insulating member 81 and abuts against the second electrode terminal 32 via the first insulating member 81.

[0289] Thus, the bending deformation of the second electrode terminal 32 can be collectively limited by the first electrode terminal 31 and the first insulating member 81, and the first electrode terminal 31 and the second electrode terminal 32 are insulated from each other, so that the ability of the first electrode terminal assembly 30 to support and fix the second electrode terminal 32 can be further increased, the bending deformation resistance of each electrode terminal is improved, the strength of the region of the first housing wall 11 where the electrode terminals are arranged can be further increased, and the polarity arrangement degree of freedom of the electrode terminals is high.

[0290] In some embodiments, the first electrode terminal assembly 30 includes the first electrode terminal 31 including a first terminal plate 41, at least part of the first terminal plate 41 being arranged on the side of the first housing wall 11 away from the accommodation space, and the second electrode terminal 32 including a second terminal plate 42, the second terminal plate 42 being arranged on the side of the first housing wall 11 away from the accommodation space, the first terminal plate 41 and the second terminal plate 42 partially overlapping along the wall thickness direction Z of the first housing wall, and the first terminal plate 41 directly or indirectly abutting against the second terminal plate 42.

[0291] Thus, a structure for supporting and fixing the first terminal plate 41 to the second terminal plate 42 can be formed on the side of the first housing wall 11 away from the accommodation space, and the bending deformation of the second terminal plate 42 away from the first housing wall 11 can be limited; or a structure for supporting and fixing the second terminal plate 42 to the first terminal plate 41 can be formed on the side of the first housing wall 11 away from the accommodation space, and the bending deformation of the first terminal plate 41 away from the first housing wall can be limited. Accordingly, the bending resistance of the region of the first housing wall 11 is improved.

[0292] In some embodiments, as shown in FIGS. 10, 13 and 29, the first electrode terminal 31 further includes a first terminal disc 311 arranged on the side of the first housing wall 11 facing the accommodation space, and the second electrode terminal 32 further includes a second terminal disc 321 arranged on the side of the first housing wall 11 facing the accommodation space. Along the wall thickness direction of the first housing wall 11, the first terminal disc 311 is at least partially arranged between the second terminal disc 321 and the first housing wall 11; or as shown in FIG. 11, along the wall thickness direction of the first housing wall 11, the second terminal disc 321 is at least partially arranged between the first terminal disc 311 and the first housing wall 11.

[0293] In some embodiments, the first electrode terminal 31 includes a first terminal plate 41 and a first terminal disc 311 which are electrically connected to each other, wherein the first terminal plate 41 is located on the side of the first shell wall 11 which is away from the accommodation space, and the first terminal disc 311 is located on the side of the first shell wall 11 which is toward the accommodation space; the second electrode terminal 32 includes a second terminal plate 42 and a second terminal disc 321 which are electrically connected to each other, wherein the second terminal plate 42 is located on the side of the first shell wall 11 which is away from the accommodation space, and the second terminal disc 321 is located on the side of the first shell wall 11 which is toward the accommodation space; and along the thickness direction of the first shell wall 11, the first terminal plate 41 is at least partially arranged between the second terminal plate 42 and the first shell wall 11.

[0294] The first terminal plate 41 and the second terminal plate 42 are located on the outside of the outer shell 1 of the battery monomer, and can be used to connect with the busbar and the like; the first terminal disc 311 and the second terminal disc 321 are located on the inside of the outer shell 1 of the battery monomer, and can be used to electrically connect with the tab. The terminal plate and the terminal disc can be made of metal material, such as copper, aluminum and the like.

[0295] Optionally, the first terminal plate 41, the second terminal plate 42, the first terminal disc 311 and the second terminal disc 321 each have a generally flat plate shape. The shape of the flat plate can be designed according to the situation, for example, it can be rectangular, circular, L-shaped as shown in FIG. 18, etc.

[0296] Optionally, the first terminal plate 41, the second terminal plate 42, the first terminal disc 311 and the second terminal disc 321 can be fixed together with the first shell wall 11 through connecting columns or the like.

[0297] As described above, along the thickness direction perpendicular to the first shell wall 11, the first terminal plate 41 and the second terminal plate 42 can partially overlap each other through a part of the first insulating member 81. Similarly, along the thickness direction perpendicular to the first shell wall 11, the first terminal disc 311 and the second terminal disc 321 can partially overlap each other through a part of the insulating member, which is different from the first insulating member 81, for example, the insulating member located below the first shell wall 11.

[0298] Since the electrode terminal includes the terminal plate located on the outside of the outer shell of the battery monomer 10 and the terminal disc located on the inside of the outer shell, the electrode terminal can be easily connected with the tab of the electrode assembly through the terminal disc, and the heat dissipation, the support to the first shell wall 11 and the connection strength with the busbar can be improved by designing the terminal plate to be larger, and the shape design freedom of the terminal plate and the terminal disc is higher. Moreover, the terminal plate and the terminal plate respectively clamp the first shell wall 11 from the inside and the outside of the outer shell 1, and the bending strength of the first shell wall 11 can be improved.

[0299] In some embodiments, as shown in FIGS. 7, 8, 10, 13 and 29, the battery cell 10 further comprises a second insulating member 82, which is at least partially located between the second electrode terminal 32 and the first housing wall 11.

[0300] The second electrode terminal 32 and the first housing wall 11 can have an insulating member therebetween, or no insulating member therebetween.

[0301] Optionally, the second electrode terminal 32 is connected with the negative tab, no insulating member is provided between the second electrode terminal 32 and the first housing wall 11, and the first housing wall 11 or even the entire housing 1 is negatively charged.

[0302] Optionally, the second electrode terminal 32 is connected with the positive tab or the negative tab, and the second electrode terminal 32 and the first housing wall 11 have a second insulating member 82 therebetween, so that the first housing wall 11 or even the entire housing 1 is insulated from the second electrode terminal 32 and is not charged.

[0303] 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.

[0304] In some embodiments, the first insulating member 81 and the second insulating member 82 are integrally formed.

[0305] 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.

[0306] The first insulating member 81 and the second insulating member 82 can be formed in a shallow tray shape substantially matching the shapes of the first electrode terminal 31 and the second electrode terminal 32, so as to accommodate the first electrode terminal 31 and the second electrode terminal 32, and insulate the first electrode terminal 31 and the second electrode terminal 32 from the bottom surface and the peripheral surface of the first electrode terminal 31 and the second electrode terminal 32 in the wall thickness direction Z of the first housing wall.

[0307] In this way, the number of components can be reduced, and the assembly steps can be simplified.

[0308] In some embodiments, as shown in FIGS. 9, 10, 13 and 29, 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 located in the recesses.

[0309] The first recess 111 and the second recess 112 are recessed regions formed by reducing the thickness of the first housing wall 11 in the wall thickness direction Z of the first housing wall, and the plan view shape (shape observed in the wall thickness direction Z of the first housing wall) thereof can be configured to be able to accommodate at least a portion of the first insulating member 81 and at least a portion of the second insulating member 82. The recessed depth of the recessed regions can be substantially the same as or slightly lower than the height (dimension in the wall thickness direction Z of the first housing wall) of the first insulating member 81 or the second insulating member 82.

[0310] One or two or more first recesses 111 and / or second recesses 112 can be formed on the first housing wall 11.

[0311] Corresponding to the recessed regions, the portion of the first insulating member 81 located in the first recess 111 and the portion of the second insulating member 82 located in the second recess 112 are respectively formed with protrusions that can be respectively fitted with the first recess 111 and the second recess 112, thereby being 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 (perpendicular to the wall thickness direction Z of the first housing wall) of the first housing wall 11.

[0312] 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, reduce the possibility of displacement of the insulating members along the surface of the first housing wall 11, and facilitate the positioning of the insulating members and the first housing wall 11 relative to each other during assembly.

[0313] In some embodiments, the first recess 111 and the second recess 112 form the same recess.

[0314] In this way, compared with forming recesses respectively, the processing difficulty is small and the processing is fast.

[0315] In some embodiments, as shown in FIGS. 12 and 13, along the wall thickness direction of the first housing wall 11, the surface of the side of the first covering portion 811 facing away from the first housing wall 11 does not exceed the surface of the side of the first terminal plate 41 facing away from the first housing wall; and / or, along the wall thickness direction of the first housing wall 11, the surface of the side of the covering portion facing away from the first housing wall does not exceed the surface of the side of the second terminal plate 42 facing away from the first housing wall 11.

[0316] The surface of the first cover portion 811 on the side facing away from the first housing wall 11 can be substantially flush or slightly lower than the surface of the first terminal plate 41 on the side facing away from the first housing wall. In addition, the surface of the first cover portion 811 on the side facing away from the first housing wall 11 can be substantially flush or slightly lower than the surface of the second terminal plate 42 on the side facing away from the first housing wall 11. In one specific embodiment, the surface of the cover portion 811 on the side facing away from the first housing wall 11 is substantially flush with the surface of the first terminal plate 41 on the side facing away from the first housing wall, the surface of the second terminal plate 42 on the side facing away from the first housing wall 11. Here, substantially flush means no obvious step difference.

[0317] Since the surface of the first cover portion 811 on the side facing away from the first housing wall 11 does not exceed the surface of the first terminal plate 41 and / or the second terminal plate 42 on the side facing away from the first housing wall 11, the first cover portion 811 does not additionally occupy the space of the battery monomer 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 41 and the second terminal plate 42. In some embodiments, as shown in FIG. 6, the first terminal plate 41 includes a first main body portion 51 and a first connecting portion 61 connected to each other, and the second terminal plate 42 includes a second main body portion 52 and a second connecting portion 62 connected to each other, and along the length direction of the first housing wall, the first connecting portion 61 and the second connecting portion 62 are located between the first main body portion 51 and the second main body portion 52.

[0318] In some embodiments, as shown in FIG. 27, 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 and the second recessed portion 317 at least partially overlap in the wall thickness direction of the first housing wall 11, the second protruding portion 327 and the second recessed portion 317 cooperate with each other, the second recessed portion 317 is arranged on the side of the first connecting portion 61 facing the second electrode terminal 32, and the second protruding portion 327 is arranged on the side of the second main body portion 52 facing the first electrode terminal 31.

[0319] 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.

[0320] 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.

[0321] Thus, the second recessed portion 317 provided at the first connecting portion 61 can be fixed between the second protruding portion 327 provided at the second main body portion 52 and the first housing wall 11 by being abutted by the second protruding portion 327, thereby preventing the first connecting portion 61 from being bent away from the first housing wall 11 to some extent due to being too long, improving the bending strength of the first connecting portion 61 and the entire first electrode terminal 31. The ability of the first electrode terminal assembly 30 and the second electrode terminal 32 to support and fix each other is further enhanced. Thus, even if the first connecting portion 61 is not fixed to the first housing wall 11 by a rivet, a connecting post or the like, the first connecting portion 61 can be reliably in contact with the first housing wall 11, and the risk of poor sealing due to the installation of a rivet, a connecting post or the like can be reduced.

[0322] The recessed portion and the protruding portion can be provided not only between the main body portion and the connecting portion, but also between the two connecting portions.

[0323] In some embodiments, as shown in FIGS. 27-29, the second recessed portion 317 includes a third stepped portion 3171 and a fourth stepped portion 3172, the fourth stepped portion 3172 being provided at a side of the third stepped portion 3171 away from the second electrode terminal; the second protruding portion includes a protruding portion provided at the second electrode terminal, a portion of the first electrode terminal being located between the protruding portion and the first housing wall 11 in the thickness direction of the first housing wall, the protruding portion being at least partially accommodated in a stepped space formed by the third stepped portion 3171; and the second protruding portion further includes a second covering portion 821 provided at the second insulating member 82, a portion of the first electrode terminal being located between the second covering portion 821 and the first housing wall in the thickness direction of the first housing wall, the second covering portion 821 being at least partially accommodated in a stepped space formed by the fourth stepped portion 3172.

[0324] The third stepped portion 3171 is formed by a portion of the first terminal plate 41 that is lowered away from the first housing wall 11 in the thickness direction of the first housing wall 11, such as the portion of the first terminal plate 41 in the right side of the dashed box 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.

[0325] Thus, the cooperation of the protruding portion and the third stepped portion 3171 can limit the bending deformation of the first electrode terminal, and further at least partially accommodating the protruding portion in the third stepped portion 3171 can reduce the space occupied by the protruding portion, improving the space utilization. By providing the second covering portion 821, the creepage distance on the surface of the first electrode terminal and the second electrode terminal can be increased, improving the insulation reliability. Moreover, by accommodating the second covering portion 821 in the stepped portion, the second covering portion 821 does not occupy additional space, thereby improving the space utilization.

[0326] In some embodiments, as shown in FIGS. 10, 12 and 13, the first electrode terminal 31 includes a first terminal plate 41 and a first terminal disc 311 electrically connected to each other by a first connecting post 312, wherein the first terminal plate 41 is located on the side of the first housing wall 11 facing away from the accommodation space, the first terminal disc 311 is located on the side of the first housing wall 11 facing the accommodation space, the first terminal plate 41 includes a first main body portion 51 and a first connecting portion 61, and the first terminal disc 311 is connected to the first tab 71 in the electrode assembly; the second electrode terminal 32 includes a second terminal plate 42 and a second terminal disc 321 electrically connected to each other by a second connecting post 322, wherein the second terminal plate 42 is located on the side of the first housing wall 11 facing away from the accommodation space, the second terminal disc 321 is located on the side of the first housing wall 11 facing the accommodation space, the second terminal plate 42 includes a second main body portion 52 and a second connecting portion 62, and the second terminal disc 321 is connected to the second tab 72 in the electrode assembly.

[0327] The first electrode terminal 31 includes the first terminal plate 41, the first terminal disc 311 and the first connecting post 312. The first terminal plate 41 is arranged on the surface of the first housing wall 11 facing away from the accommodation space, and includes the first main body portion 51 and the first connecting portion 61 for connecting with the current collector 2. The first terminal disc 311 is arranged in the accommodation space, and is used for connecting with the first tab 71 in the electrode assembly. The projections of the first terminal plate 41 and the first terminal disc 311 along the wall thickness direction Z of the first housing wall of the battery cell 10 at least partially overlap.

[0328] A through hole is formed on the first housing wall 11, and the projections of the through hole along the wall thickness direction Z of the first housing wall are respectively located in the overlapping regions of the first terminal plate 41 and the first terminal disc 311. The first connecting post 312 passes through the through hole, and the two ends of the first connecting post 312 are respectively connected to the first terminal plate 41 and the first terminal disc 311. An insulating member is arranged at least between the first connecting post 312 and the through hole.

[0329] The second electrode terminal 32 includes the second terminal plate 42, the second terminal disc 321 and the second connecting post 322. The second terminal plate 42 is arranged on the surface of the first housing wall 11 facing away from the accommodation space, and includes the second main body portion 52 and the second connecting portion 62 for connecting with the current collector 2. The second terminal disc 321 is arranged in the accommodation space, and is used for connecting with the second tab 72 in the electrode assembly. The projections of the second terminal plate 42 and the second terminal disc 321 along the wall thickness direction Z of the first housing wall of the battery cell 10 at least partially overlap.

[0330] The first shell wall 11 is provided with a through hole, a projection of the through hole along the wall thickness direction Z of the first shell wall is located in the overlapping area of the second terminal plate 42 and the second terminal disc 321 respectively. The second connecting column 322 passes through the through hole, and the two ends of the second connecting column 322 are connected with the second terminal plate 42 and the second terminal disc 321 respectively. At least an insulating member is arranged between the second connecting column 322 and the through hole.

[0331] Thus, the first connecting column 312 penetrates the first shell wall 11 to realize the electrical connection of the first terminal plate 41 and the first terminal disc 311, so that the first tab 71 can be in conduction with the outside world; the second connecting column 322 penetrates the first shell wall 11 to realize the electrical connection of the second terminal plate 42 and the second terminal disc 321, so that the second tab 72 can be in conduction with the outside world.

[0332] In some embodiments, as shown in FIG. 10, the first main body part 51 is provided with the first connecting column 312 connected with the first tab 71, the second main body part 52 is provided with the second connecting column 322 connected with the second tab 72, and the material of the first main body part 51 and the second main body part 52 is different from the material of the first overlapping part 91.

[0333] The electrode assembly is provided with the first tab 71 and the second tab 72. One of the first tab 71 and the second tab 72 has a positive polarity and is generally made of aluminum material. The connecting column and the main body part connected with the tab with the positive polarity are also made of aluminum material. The other of the first tab 71 and the second tab 72 has a negative polarity and is generally made of copper material. The connecting column and the main body part connected with the tab with the negative polarity are also made of copper material. The first connecting part 61 and the second connecting part 62 can be made of aluminum material or copper material.

[0334] In an optional embodiment, as shown in FIG. 4 and FIG. 10, the first tab 71 has a positive polarity and the second tab 72 has a negative polarity. The first tab 71, the first connecting column 312 and the first terminal plate 41 are all made of aluminum material. The second tab 72 and the second connecting column 322 are all made of copper material, and the second terminal plate 42 is made of aluminum material. A copper sheet in conduction with the second terminal plate 42 is arranged on the second terminal plate 42, and the second connecting column 322 is electrically connected with the copper sheet.

[0335] Thus, when the materials of the first tab 71 and the second tab 72 are different, the material of the main body part can be selected as the material of the corresponding tab to achieve a stronger conduction effect.

[0336] In some embodiments, as shown in FIG. 6, the length of the first shell wall 11 along the length direction X of the first shell wall is L, and L is less than or equal to 450 mm.

[0337] The first shell wall 11 has a length along the length direction X of the first shell wall that is greater than or equal to 450 mm, i.e., L≥450 mm.

[0338] In this way, the first shell wall 11 has sufficient length to dispose the first electrode terminal 31 and the second electrode terminal 32.

[0339] In a second aspect, the disclosure also provides a battery, as shown in FIG. 3, comprising a box 20 and the battery cell 10 provided in the first aspect.

[0340] The plurality of battery cells 10 are disposed in the box 20, and the busbars 2 are disposed between the plurality of battery cells 10 to electrically connect them.

[0341] Since the battery comprises the battery cell 10 with strong structural strength, it is helpful to make the battery still work normally after being subjected to jolting and impact, and improve the reliability of the battery in use.

[0342] In some embodiments, as shown in FIGS. 18-20, each battery cell 10 is arranged along the width direction Y of the first shell wall, and in adjacent battery cells 10, the first connecting portion 61 of one battery cell 10 at least partially overlaps the second connecting portion 62 of another battery cell 10 along the width direction Y of the first shell wall and is electrically connected by the busbar 2.

[0343] The battery cells 10 are arranged along the width direction Y of the first shell wall, the first connecting portion 61 and the second connecting portion 62 are alternately arranged along the width direction Y of the first shell wall, the first connecting portion 61 and the second connecting portion 62 of adjacent battery cells 10 are adjacent to each other, and the projections of the first overlapping portions 91 of each battery cell 10 along the width direction Y of the first shell wall coincide with each other.

[0344] The first electrode terminal 31 of one battery cell 10 and the second electrode terminal 32 of another battery cell 10 can be of the same polarity, and the busbar 2 connects the two to realize parallel connection between the battery cells 10, thereby providing a required amount of electricity. The first electrode terminal 31 of one battery cell 10 and the second electrode terminal 32 of another battery cell 10 can be of opposite polarity, and the busbar 2 connects the two to realize series connection between the battery cells 10, thereby providing a required voltage.

[0345] On one battery cell 10, the busbar 2 covers at least part of the surface of the first electrode terminal 31 away from the first shell wall 11, but does not cover the second electrode terminal 32 on the battery cell 10, in other words, along the thickness direction Z of the first shell wall of the battery cell 10, the projection of the busbar 2 overlaps the first electrode terminal 31 and is located outside the second electrode terminal 32.

[0346] On the other battery cell 10, the busbar 2 covers at least a part of the second electrode terminal 32 away from the surface of the first housing wall 11, without covering the first electrode terminal 31 on the battery cell 10. In other words, along the wall thickness direction Z of the first housing wall of the battery cell 10, the projection of the busbar 2 has an overlap with the second electrode terminal 32, and is located outside the first electrode terminal 31.

[0347] Since the battery cells 10 are arranged along the width direction Y of the first housing wall, and the first connecting portion 61 and the second connecting portion 62 at least partially overlap along the width direction Y of the first housing wall, the first connecting portion 61 and the second connecting portion 62 of adjacent battery cells 10 are adjacent to each other. Since the first connecting portion 61 and the second connecting portion 62 on adjacent battery cells 10 are connected by the busbar 2 and are adjacent to each other, it helps to shorten and simplify the connection path of the busbar 2, and save the material of the busbar 2.

[0348] In some embodiments, in adjacent battery cells 10, the first overlapping portion 91 of the first connecting portion 61 of one battery cell 10 and the first overlapping portion 91 of the second connecting portion 62 of the other battery cell are electrically connected by the busbar 2.

[0349] The projection of the first overlapping portion 91 of the first connecting portion 61 of one battery cell 10 and the first overlapping portion 91 of the second connecting portion 62 of the other battery cell 10 along the width direction Y of the first housing wall coincides, and the busbar 2 can be configured to a regular shape covering the first overlapping portions 91 of both.

[0350] Since the battery cells 10 are arranged along the width direction Y of the first housing wall, the first overlapping portion 91 of the first connecting portion 61 and the first overlapping portion 91 of the second connecting portion 62 are arranged along the width direction Y of the first housing wall. By connecting the first overlapping portion 91 of the first connecting portion 61 of one battery cell 10 and the first overlapping portion 91 of the second connecting portion 62 of the other battery cell 10 by the busbar 2, the busbar 2 is arranged along the width direction Y of the first housing wall, which helps to shorten and simplify the connection path of the busbar 2, and save the material of the busbar 2.

[0351] In some embodiments, in adjacent battery cells 10, at least one of the first main body portion 51 of one battery cell 10 and the second main body portion 52 of the other battery cell is electrically connected to the busbar 2.

[0352] Since the busbar 2 can also connect the main body portion on the basis of connecting the connecting portion, the busbar 2 and the electrode terminal can have a larger communication area, which helps to enhance the overcurrent capacity.

[0353] In some embodiments, as shown in FIGS. 23 and 24, at least one of the case walls of the case 20 has a boss 1111a formed by bulging the case wall in a direction away from the battery cell 10, the boss 1111a forms a receiving portion 1111b on a side facing the battery cell 10, and the projections of the first electrode terminal 31 and the second electrode terminal 32 do not exceed the projection of the boss 1111a in a direction perpendicular to the case wall on which the boss 1111a is formed, and the first electrode terminal 31 and / or the second electrode terminal 32 is / are at least partially received in the receiving portion 1111b.

[0354] Therefore, the height of the case at the position of the first electrode terminal 31, the second electrode terminal 32, and the busbar can be increased only, so that the size of the battery can be inhibited, and the volume utilization of the battery can also be improved.

[0355] In a third aspect, the present disclosure also provides a power-using device, which includes a plurality of the battery cell 10 provided in the first aspect or the battery provided in the second aspect, and the battery cell 10 or the battery supplies power to the power-using device.

[0356] As shown in FIG. 1, the power-using device can be a vehicle 1000.

[0357] Therefore, the power-using device can be suitable for working conditions such as bumping and vibration, and the stability of the power-using device can be improved.

[0358] In a fourth aspect, the present disclosure also provides an energy storage device 2000, as shown in FIG. 2, which includes a plurality of the battery cell 10 provided in the first aspect or the battery provided in the second aspect, and the battery cell 10 or the battery is used for storing and providing electric energy.

[0359] Therefore, the energy storage device 2000 can be suitable for working conditions such as bumping and vibration, and the stability of the energy storage device can be improved.

[0360] The various embodiments / implementation modes provided by the present disclosure can be combined with each other without contradiction.

[0361] The above description is only the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure can have various modifications and changes. Any 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

[0362] The present disclosure provides a battery cell, a battery, an electric device and an energy storage device. In the battery cell, the first connecting part and the second connecting part are arranged along the width direction of the first shell wall and the projections thereof along the width direction of the first shell wall overlap, so that the first electrode terminal and the second electrode terminal are arranged compactly, which helps to form a structure reinforcement with a larger area by cooperation, thereby improving the structural strength of the first shell wall, in particular the bending strength. Since the first connecting part and the second connecting part are respectively used for connecting with the busbar, after a plurality of battery cells are arranged along the width direction of the first shell wall, the first connecting part and the second connecting part of adjacent battery cells are opposite to each other, which helps to shorten the connection path of the busbar. Since the electrode assembly is arranged in the accommodation space, the shell can protect the electrode assembly. Since the first shell wall is provided with the first electrode terminal and the second electrode terminal, the electrode assembly can be connected with the outside through the electrode terminal.

Claims

1. A battery cell, wherein, including: a housing having an accommodation space, the housing including a first housing wall; an electrode assembly disposed in the accommodation space; and a first electrode terminal disposed on the first housing wall, the first electrode terminal including a first connecting portion for connecting with a first bus member; a second electrode terminal disposed on the first housing wall, the second electrode terminal including a second connecting portion for connecting with a second bus member; the first connecting portion and the second connecting portion are arranged along a width direction of the first housing wall, and a projection of the first connecting portion and the second connecting portion along the width direction of the first housing wall at least partially overlaps.

2. The battery cell according to claim 1, wherein the first electrode terminal further includes a first body portion connected with the first connecting portion, and the second electrode terminal further includes a second body portion connected with the second connecting portion, at least a portion of the first connecting portion and at least a portion of the second connecting portion are located between the first body portion and the second body portion along a length direction of the first housing wall.

3. The battery cell according to claim 2, wherein a length of the first body portion along the width direction of the first housing wall is greater than or equal to the first connecting portion; and / or a length of the second body portion along the width direction of the first housing wall is greater than or equal to the second connecting portion.

4. The battery cell according to claim 3, wherein the first connecting portion is arranged offset with respect to a center position of the first body portion along the width direction of the first housing wall; and / or the second connecting portion is arranged offset with respect to a center position of the second body portion along the width direction of the first housing wall.

5. The battery cell according to claim 2, wherein the first body portion and the second connecting portion partially overlap along the length direction of the first housing wall, and / or the second body portion and the first connecting portion partially overlap along the length direction of the first housing wall.

6. The battery cell according to claim 5, wherein a notch is formed between the first connecting portion and the first body portion, and the second connecting portion is at least partially located in the notch.

7. The battery cell according to any one of claims 1 to 6, wherein a length of the first housing wall along the length direction of the first housing wall is L, a length of the first connecting portion along the length direction of the first housing wall is A1, and a length of the second connecting portion along the length direction of the first housing wall is A2, and 10% ≤ A1 / L ≤ 40% and / or 10% ≤ A2 / L ≤ 40%.

8. The battery cell according to any one of claims 1 to 7, wherein the first connecting portion and the second connecting portion have a first overlapping portion along the width direction of the first housing wall, a length of the first overlapping portion along the length direction of the first housing wall is in a range of 3 mm to 50 mm.

9. The battery cell according to any one of claims 2 to 6, wherein ​ The first main body portion and the second main body portion are located between the first connecting portion and the second connecting portion in a width direction of the first case wall.

10. The battery cell according to claim 9, wherein The first main body portion and the second main body portion have a second overlapping portion in a length direction of the first case wall, A length of the first case wall in the width direction of the first case wall is W, and a length of the second overlapping portion in the width direction of the first case wall is B, and B is in a range of 20% to 90% of W.

11. The battery cell according to claim 9 or 10, wherein A length of the first main body portion in the width direction of the first case wall is B1, and a length of the second main body portion in the width direction of the first case wall is B2, and an absolute value of a difference between B1 and B2 is greater than or equal to 0 mm.

12. The battery cell according to claim 11, wherein The absolute value of the difference between B1 and B2 is in a range of 0 mm to 50 mm.

13. The battery cell according to any one of claims 1 to 12, wherein A closest distance between the first electrode terminal and the second electrode terminal in the length direction of the first case wall and in the width direction of the first case wall is greater than or equal to 0.3 mm.

14. The battery cell according to claim 13, wherein The closest distance between the first electrode terminal and the second electrode terminal in the length direction of the first case wall and in the width direction of the first case wall is greater than or equal to 2.0 mm.

15. The battery cell according to any one of claims 2 to 6, 9 to 12, wherein Each of the first electrode terminal and the second electrode terminal includes a connection region for connection with a bus member for electrically connecting a plurality of the battery cells to each other.

16. The battery cell according to claim 15, wherein The first connecting portion and the second connecting portion have a first overlapping portion in the width direction of the first case wall, The connection region is formed at least in the first overlapping portion.

17. The battery cell according to claim 16, wherein The connection region is also formed in at least either of the first main body portion and the second main body portion.

18. The battery cell according to claim 16 or 17, wherein An area of the connection region formed in the first overlapping portion is SA, and a total area of the connection regions is S, and SA accounts for 50% to 100% of S.

19. The battery cell according to any one of claims 15 to 18, wherein A shift distance of a center line position of the connection region formed in the first connecting portion with respect to a center line position of the first case wall in the width direction of the first case wall is B3, and B3 is in a range of 15% to 27% of W.

20. The battery cell according to any one of claims 2 to 6, 9 to 12, 15 to 19, wherein The battery cell further includes a first insulating member fixed to the first electrode terminal, the second electrode terminal being at least partially disposed between the first insulating member and the first housing wall, the first insulating member abutting the second electrode terminal.

21. The battery cell according to claim 20, wherein the electrode assembly includes first and second polar plates of opposite polarity, 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.

22. The battery cell according to claim 20 or 21, wherein the first insulating member is partially disposed between the first electrode terminal and the first housing wall.

23. The battery cell according to any one of claims 20 to 22, wherein the first electrode terminal, the first insulating member, and the second electrode terminal partially overlap in a wall thickness direction of the first housing wall, and a portion of the first electrode terminal that overlaps the first insulating member and the second electrode terminal abuts the first insulating member.

24. The battery cell according to claim 23, wherein the first electrode terminal includes a first terminal plate at least a portion of which is disposed on a side of the first housing wall facing away from the accommodation space, the second electrode terminal includes a second terminal plate disposed on a side of the first housing wall facing away from the accommodation space, and the first insulating member is fixed to the first terminal plate; the first terminal plate, the first insulating member, and the second terminal plate partially overlap in a wall thickness direction of the first housing wall, and the second terminal plate is at least partially disposed between the first insulating member and the first housing wall, and the first terminal plate abuts the first insulating member.

25. The battery cell according to claim 24, wherein the first electrode terminal includes a first terminal disc at least a portion of which is disposed on a side of the first housing wall facing toward the accommodation space, the second electrode terminal includes a second terminal disc disposed on a side of the first housing wall facing toward the accommodation space, the first terminal disc is at least partially disposed between the second terminal disc and the first housing wall in a wall thickness direction of the first housing wall; or the second terminal disc is at least partially disposed between the first terminal disc and the first housing wall in a wall thickness direction of the first housing wall.

26. The battery cell according to claim 24, 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.

27. The battery cell according to claim 26, wherein the first recess includes a first step portion and a second step portion, the second step portion is disposed on a side of the first step portion distal from the first electrode terminal assembly, the first protrusion includes a first step portion and a second step portion, the second step portion is disposed on a side of the first step portion distal from the second electrode terminal assembly, and the first step portion of the first protrusion and the first step portion of the first recess are substantially flush with each other. The first protrusion includes a protruding portion provided to 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 stepped portion. The first protrusion further includes a covering portion provided to the first insulating member, and a portion of the second electrode terminal is located between the covering portion and the first housing wall in the wall thickness direction of the first housing wall, and the covering portion is at least partially accommodated in a step space formed by the second stepped portion.

28. The battery cell according to any one of claims 24 to 27, wherein a surface of the covering portion on a side facing away from the first housing wall does not exceed a surface of the first terminal plate on a side facing away from the first housing wall in the wall thickness direction of the first housing wall; and / or a surface of the covering portion on a side facing away from the first housing wall does not exceed a surface of the second terminal plate on a side facing away from the first housing wall in the wall thickness direction of the first housing wall.

29. The battery cell according to claim 26 or 27, wherein the first recess is provided to a side of the second connecting portion facing the first electrode terminal, and the first protrusion is provided to a side of the first main body portion facing the second electrode terminal.

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

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

32. The battery cell according to any one of claims 20 to 31, wherein the battery cell further includes a second insulating member, and the second insulating member is at least partially provided between the second terminal plate and the first housing wall.

33. The battery cell according to claim 32, wherein ​ a first recess and a second recess are formed in the first housing wall, at least a portion of the first insulating member and at least a portion of the second insulating member are respectively positioned in the first recess and the second recess.

34. The battery cell according to any one of claims 20 to 33, wherein the first connecting column is provided in the first main body portion, and the first connecting column is connected to the first tab, the second connecting column is provided in the second main body portion, and the second connecting column is connected to the second tab, 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.

35. The battery cell according to any one of claims 1 to 34, wherein 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.

36. A battery, wherein, a battery including a case and at least two battery cells according to any one of claims 1 to 35.

37. The battery according to claim 36, wherein the battery cells are arranged in the width direction of the first housing wall, in the adjacent battery cells, the first connecting portion of one battery cell and the second connecting portion of the other battery cell at least partially overlap in the width direction of the first housing wall and are electrically connected by a bus member.

38. The battery according to claim 37, wherein in the adjacent battery cells, the first overlapping portion of the first connecting portion of one battery cell and the first overlapping portion of the second connecting portion of the other battery cell are electrically connected by a bus member.

39. The battery according to claim 38, wherein in the adjacent battery cells, at least one of the first main body portion of one battery cell and the second main body portion of the other battery cell is electrically connected to the bus member.

40. The battery according to any one of claims 37 to 39, wherein at least one case wall of the case has a boss formed by bulging toward a direction away from the battery cells, the boss forms a receiving portion on a side toward the battery cells, in a direction perpendicular to the case wall in which the boss is formed, the projection of the first electrode terminal and the second electrode terminal do not exceed the projection of the boss, and the first electrode terminal and / or the second electrode terminal are at least partially received in the receiving portion.

41. An electrical device, comprising: the power consuming device includes a plurality of battery cells according to any one of claims 1 to 35, or a battery according to any one of claims 36 to 40, and the battery cells or the battery supply power to the power consuming device.

42. An energy storage device, wherein, the energy storage device includes a plurality of battery cells according to any one of claims 1 to 35, or a battery according to any one of claims 36 to 40, and the battery cells or the battery are used to store electric energy and can supply electric energy.

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