Battery cell, battery and electric device

Abstract

A battery cell (10), a battery (100) and an electric device. The battery cell (10) comprises an electrode assembly (11) and a terminal post (12), wherein the electrode assembly (11) comprises an electrode sheet portion (111) and a tab (112), the tab (112) being located on one side of the electrode sheet portion (111) in a first direction and connected to the electrode sheet portion (111); the terminal post (12) is arranged on one side of the electrode sheet portion (111) in the first direction, and part of the surface of the terminal post (12) forms a support face (1222a); and part of the tab (112) is attached to the support face (1222a), the support face (1222a) is located on the side of the part of the tab (112) close to the electrode sheet portion (111) in the first direction, and the tab (112) is electrically connected to the terminal post (12). By means of the support effect of the support face (1222a) on the tab (112), it is beneficial to make an acting force on a welding region be a compressive stress or reduce the magnitude of a tensile acting force on the welding region, thereby facilitating a reduction in the probability of damage to the welding region due to stress, improving the connection stability of the terminal post (12) and the tab (112), and facilitating an improvement in the usage safety of the battery cell (10).

Description

Battery monomer, battery and electric device

[0001] Cross-reference to related applications

[0002] The present disclosure is based on the Chinese patent application No. 202410840448.8, filed on June 26, 2024, entitled "Battery monomer, battery and electric device", and claims the priority of the Chinese patent application, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] Embodiments of the present disclosure relate to the technical field of battery, in particular to a battery monomer, a battery and an electric device. BACKGROUND

[0004] 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 energy storage fields and the like.

[0005] The battery monomer is provided with a pole and an electrode assembly, the electrode assembly is electrically connected with the pole, and the pole is electrically connected with other devices outside the battery monomer. Through the pole, the battery monomer and other devices realize charging and discharging functions.

[0006] The electrode assembly includes a pole piece part and a pole lug. The pole piece part is used for electrochemical reaction with the electrolyte stored in the battery monomer. The pole lug is electrically connected with the pole and the pole lug, so that the current can be transmitted between the two.

[0007] In the process of manufacturing and using the battery monomer, the pole lug will be subjected to the pulling action of the pole piece part and the pole, so that the connection area of the pole lug and the pole has a risk of fracture.

[0008] SUMMARY

[0009] Therefore, embodiments of the present disclosure aim to provide a battery monomer, a battery and an electric device capable of improving the connection stability of the pole lug and the pole.

[0010] To achieve the above-mentioned purpose, the technical solution of the embodiments of the present disclosure is as follows:

[0011] The embodiments of the present disclosure provide a battery monomer, which comprises:

[0012] An electrode assembly, comprising a pole piece part and a pole lug, the pole lug being located on one side of the pole piece part along a first direction and connected with the pole piece part;

[0013] A pole provided on one side of the pole piece part along the first direction, a part of the surface of the pole forming a supporting surface;

[0014] Part of the tab is attached to the support surface, and the support surface is located on the side of the part of the tab close to the tab portion along the first direction, and the tab is electrically connected to the pole.

[0015] The battery cell in the embodiments of the present disclosure is beneficial to making the force on the welding area a compressive stress or reducing the size of the tensile force on the welding area, thereby reducing the probability of force damage of the welding area, improving the connection stability of the pole and the tab, and improving the use safety of the battery cell.

[0016] In some embodiments, the support surface extends perpendicularly to the first direction. In this way, the probability of relative motion between the tab and the pole in the direction perpendicular to the first direction is reduced, the relative position of the tab and the pole is kept stable, and the tensile force on the welding area of the tab and the pole is further reduced, and the probability of disconnection between the tab and the pole is reduced.

[0017] In some embodiments, the pole is provided with a mounting space, one side of the mounting space is open to form an opening communicating with the outside of the pole, a part of the tab extends into the mounting space through the opening, and part of the inner wall of the mounting space forms the support surface. In this way, the inner wall of the mounting space is beneficial to the better constraint of the tab, and the shielding effect of the inner wall of the mounting space reduces the risk of short circuit caused by impurities in the tab portion entering the attachment position of the tab and the support surface.

[0018] In some embodiments, part of the tab is clamped between the inner walls of the mounting space on both sides along the first direction. In this way, on the one hand, the friction between the inner wall of the mounting space and the tab is beneficial to keeping the relative position of the pole and the tab stable and reducing the probability of disconnection between the pole and the tab; on the other hand, the contact area between the pole and the tab is increased, which is beneficial to improving the current carrying capacity between the pole and the tab.

[0019] In some embodiments, the mounting space is open toward the second direction, and the first direction intersects the second direction. In this way, the edge of the opening can stop the tab along the first direction, and the pole further stops the tab, reducing the tensile force on the welding area of the tab and the pole, and at the same time, reducing the probability of impurities in the battery cell entering the mounting space through the opening.

[0020] In some embodiments, the mounting space is open along at least one side of the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. In this way, during the assembly of the battery cell, the position of the tab in the mounting space can be observed and adjusted from the communication position of the mounting space along the third direction, and the part of the pole post forming the support surface can be displaced along the first direction under the force of the pole post to reduce the force on the fitted position of the support surface and the tab. In some embodiments, the pole post comprises a main body portion and a connecting portion, the connecting portion is electrically connected to the main body portion, a part of the connecting portion is bent to form a mounting space with the main body portion, and at least part of the surface of the part of the connecting portion forms a support surface. In this way, during the manufacture of the pole post, the connecting portion and the mounting space can be formed by bending a part of the pole post, which is simple in manufacturing process and helps to reduce production costs.

[0021] In some embodiments, the mounting space is located between the main body portion and the tab portion. In this way, the connecting portion is close to the tab portion, which helps to make the support surface close to the tab portion, facilitates the fitting of tabs of different sizes with the support surface, and helps to improve the fitting of the pole post.

[0022] In some embodiments, the connecting region of the main body portion and the connecting portion is located at the end of the main body portion close to the tab portion along the first direction, and is located at the edge of the end portion perpendicular to the first direction. In this way, the size of the part of the connecting portion spaced apart from the main body portion along the first direction after bending is increased, which helps to increase the size of the support surface and make the support effect of the connecting portion on the tab more stable.

[0023] In some embodiments, the connecting portion comprises a first sub-portion and a second sub-portion, the second sub-portion extends along the second direction and is spaced apart from the main body portion along the first direction, the first direction and the second direction are perpendicular to each other, the first sub-portion connects the second sub-portion and the main body portion, at least part of the surface of the second sub-portion forms a support surface, and the cross-sectional area of the first sub-portion increases from the end of the first sub-portion close to the second sub-portion to the end of the first sub-portion close to the main body portion along the extension direction of the first sub-portion. In this way, the second sub-portion deforms relative to the first sub-portion along the first direction, thereby absorbing the force through deformation and acting as a buffer to reduce the force transmitted to the support surface, which helps to improve the connection stability of the tab and the pole post, reduce the resistance at the connection position of the connecting portion and the main body portion, improve the current carrying capacity of the pole post, and improve the charge and discharge performance of the battery cell.

[0024] In some embodiments, the first sub-part is arranged at an end surface of the main body part close to one end of the pole piece part in the first direction, and the first sub-part extends in the first direction, and in a projection plane perpendicular to the first direction, a projection of the connection region of the first sub-part and the second sub-part is located within a projection range of the connection region of the first sub-part and the main body part. In this way, the structural strength of the first sub-part is improved, and the probability of deformation of the first sub-part under the bending force during the bending and connecting process is reduced, and the probability of the main body part being unable to form a mounting space during the bending and connecting process is reduced.

[0025] In some embodiments, the distance between the center position of the connection region of the first sub-part and the second sub-part and the center position of the end surface of the main body part close to one end of the pole piece part in the first direction is not greater than 10 mm in the direction perpendicular to the first direction. In this way, the first sub-part is arranged close to the center position of the end surface of the main body part close to one end of the pole piece part in the first direction, so that after the current flows from the first sub-part to the main body part, the cross-sectional area of the current flow region can be rapidly expanded, thereby reducing the resistance of the current flow region and improving the current carrying capacity of the pole.

[0026] In some embodiments, the battery monomer includes a shell, the shell has a containing cavity, a part of the outer surface of the shell protrudes in the first direction to form a protrusion, an end surface of the protrusion in the first direction is provided with a mounting hole, the mounting hole is connected to the containing cavity and the outside of the shell, the pole is arranged in the mounting hole, and the connecting part is located in the internal space of the protrusion. In this way, the space for arranging the pole piece part in the containing cavity is more regular, and the probability of damage to the pole piece part caused by extrusion of the connecting part and the pole piece part is reduced.

[0027] The battery provided by the embodiments of the present disclosure includes a box body and the battery monomer in any of the foregoing embodiments, the box body has a containing space, and the battery monomer is arranged in the containing space. In this way, by using the battery monomer in the foregoing embodiments, the connection stability of the pole and the tab is improved, the use safety of the battery monomer is improved, and the use safety of the battery as a whole is improved.

[0028] In some embodiments, the battery further includes a current collecting piece, and the number of the battery monomers is multiple, and the pole of one battery monomer is electrically connected to the pole of another battery monomer through the current collecting piece. In this way, the poles of the battery monomers are electrically connected through the current collecting piece, and the series and parallel connection of the battery monomers is realized.

[0029] The power utilization device provided by the embodiments of the present disclosure includes the battery in the foregoing embodiments, and the battery serves as the power supply of the power utilization device. In this way, by using the battery in the foregoing embodiments, the use safety of the power utilization device as a whole is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 is a schematic view of a vehicle as an example of an electric device according to an embodiment of the present disclosure;

[0031] Fig. 2 is a schematic view of a battery according to an embodiment of the present disclosure;

[0032] Fig. 3 is a schematic view of a battery cell according to a first embodiment of the present disclosure;

[0033] Fig. 4 is a schematic view of a cross section of a position A-A in Fig. 3;

[0034] Fig. 5 is a schematic view of a partial enlarged view of a position B in Fig. 4;

[0035] Fig. 6 is a schematic view of a partial enlarged cross section of a battery cell according to a second embodiment of the present disclosure, and the position of the partial enlarged cross section is consistent with the position B in Fig. 4;

[0036] Fig. 7 is a schematic view of a partial enlarged cross section of a battery cell according to a third embodiment of the present disclosure, and the position of the cross section is consistent with the position A-A in Fig. 3;

[0037] Fig. 8 is a schematic view of a partial enlarged view of a position C in Fig. 7;

[0038] Fig. 9 is a schematic view of a pole according to an embodiment of the present disclosure;

[0039] Fig. 10 is an exploded schematic view of a battery cell according to a fourth embodiment of the present disclosure;

[0040] Fig. 11 is a schematic view of a connection between a battery cell and a busbar according to an embodiment of the present disclosure.

[0041] Legend 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, battery cell; 11, electrode assembly; 111, electrode sheet portion; 112, tab; 1121, fitting portion; 1122, folding portion; 12, pole; 12a, mounting space; 12b, opening; 121, main body portion; 1211, first sub-portion; 1212, second sub-portion; 122, connecting portion; 1221, first sub-portion; 1222, second sub-portion; 1222a, support surface; 13, housing; 13a, accommodating cavity; 13b, mounting hole; 131, protrusion; 132, cover plate; 133, housing; 20, box; 20a, accommodating space; 21, top cover; 22, bottom cover; 30, busbar. DETAILED DESCRIPTION

[0042] It should be noted that the embodiments and technical features in the present disclosure can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation of the purpose of the present disclosure, and should not be regarded as an improper limitation of the present disclosure.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise noted, the terms "including" and "comprising" are open-ended and do not exclude the presence of unrecited elements or limitations.

[0044] In the description of the embodiments of the disclosure, the technical terms "first", "second", "third" 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 technical features indicated. In the description of the embodiments of the disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0045] 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 each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments 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 " / " in this paper generally represents the "or" relationship between the front and rear associated objects.

[0047] In the description of the embodiments of the disclosure, for the convenience of description, as shown in FIGS. 3 to 7, the direction of the arrow X is "the first direction", as shown in FIGS. 5 and 6, the direction of the arrow Y is "the second direction", and as shown in FIGS. 9 and 10, the direction of the arrow Z is "the third direction".

[0048] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the disclosure can be understood according to the specific circumstances.

[0049] In the description of the embodiments of the present disclosure, unless explicitly defined and limited otherwise, the technical term "contact" should be interpreted broadly, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact with each other without interaction force or contact between two objects in contact with each other with interaction force.

[0050] At present, batteries are increasingly widely used in life and industry. Batteries are not only used in energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of batteries, the market demand is also increasing.

[0051] FIG. 2 is a perspective exploded view of the battery 100 according to an embodiment of the present disclosure. As shown in FIG. 2, the battery 100 includes a box 20 and at least one battery cell 10,

[0052] The box 20 includes a top cover 21 and a bottom cover 22, and the top cover 21 is covered on the bottom cover 22, so as to form an accommodation space 20a for placing the battery cell 10 between the bottom cover 22 and the top cover 21.

[0053] In the battery 100, the battery cell 10 can be multiple, and the multiple battery cells 10 can be connected in series, in parallel or in mixed connection. The mixed connection means that there are both series connection and parallel connection among the multiple battery cells 10. The multiple battery cells 10 can be directly connected in series, in parallel or in mixed connection, and then the whole of the multiple battery cells 10 is placed in the accommodation space 20a formed by the bottom cover 22 and the top cover 21; of course, the battery 100 can also be that the multiple battery cells 10 are first connected in series, in parallel or in mixed connection to form a battery module, and then multiple battery modules are connected in series, in parallel or in mixed connection to form a whole, and are accommodated in the accommodation space 20a formed by the bottom cover 22 and the top cover 21. The battery 100 can also include other structures, for example, the battery 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 10.

[0054] The battery cell 10 involved in the embodiments of the present disclosure includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet part, a negative electrode sheet part and a separator. The battery cell 10 mainly relies on the movement of metal ions between the positive electrode sheet part and the negative electrode sheet part to work. The positive electrode sheet part includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector without the positive electrode active material layer is protruded from the current collector with the positive electrode active material layer, and the current collector without the positive electrode active material layer is laminated as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet part includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the negative electrode active material layer is protruded from the current collector with the negative electrode active material layer, and the current collector without the negative electrode active material layer is laminated as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a winding type structure or a laminated type structure.

[0055] The battery cell 10 can be a secondary battery, which refers to a battery cell 10 that can be activated by charging after discharging to continue to be used.

[0056] The battery cell 10 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited thereto.

[0057] The battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a soft package battery cell or other shapes, and the prismatic battery cell includes a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, for example, a hexagonal prismatic battery cell, etc., and the embodiments of the present disclosure are not particularly limited.

[0058] The battery 100 involved in the embodiments of the present disclosure refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity.

[0059] The power consuming device involved in the embodiments of the present disclosure is powered by the above-mentioned battery, and the power consuming device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric automobile toy, an electric ship toy and an electric aircraft toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0060] In the following embodiments, for the convenience of description, the power utilization device of an embodiment of the present disclosure is taken as a vehicle 1000 for example. The following is described in conjunction with the drawings.

[0061] FIG. 1 is a structural schematic diagram of a 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, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. As shown in FIG. 1, the vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0062] 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.

[0063] The following is a detailed description of the embodiments of the present disclosure.

[0064] In the related art, the electrode assembly includes a tab portion and a tab, and the tab is connected between the tab portion and the pole to achieve electrical connection therebetween. Both the tab and the pole are made of metal material, and therefore, the welding method is generally used to connect and achieve electrical conduction between the tab and the pole.

[0065] During use of the battery monomer, a relative movement trend can occur between the pole and the tab, so that the welding area of the tab and the pole can be subjected to a tensile force. For example, during discharge of the battery monomer, the battery monomer expands, causing the pole to move away from the tab portion, thereby generating a tensile force on the tab. Under the action of the tensile force, the welding area between the pole and the tab is prone to force cracking and detachment, thereby adversely affecting the electrical connection between the pole and the tab.

[0066] Based on the above technical problem, an embodiment of the present disclosure provides a battery monomer, which is provided with a mounting space in the pole, and part of the inner wall of the mounting space can be attached to the tab to provide a supporting force on the tab, thereby reducing the risk of cracking of the welding area of the tab and the pole due to the tensile force.

[0067] Specifically, this disclosure provides a battery cell 10, as shown in Figures 3 to 6, which includes an electrode assembly 11 and a terminal post 12.

[0068] The electrode assembly 11 includes an electrode portion 111 and an electrode tab 112, wherein the electrode tab 112 is located on one side of the electrode portion 111 along a first direction and the two are connected.

[0069] The pole post 12 is disposed on one side of the electrode portion 111 along the first direction, a portion of the surface of the pole post 12 forms a support surface 1222a, and one side of the mounting space 12a is open to form an opening 12b that communicates with the outside of the pole post 12.

[0070] A portion of the tab 112 is in contact with the support surface 1222a, and the support surface 1222a is located on the side of the portion of the tab 112 that is close to the electrode portion 111 along the first direction. The tab 112 is electrically connected to the electrode post 12.

[0071] Electrode assembly 11 is used to generate an electrochemical reaction with the electrolyte stored in the battery cell 10.

[0072] The electrode assembly 11 includes multiple electrode sheets, which are formed by stacking or winding the multiple electrode sheets.

[0073] The electrode sheet includes a body and a sub-tab 112, with the sub-tab 112 located on one side of the body. The bodies of multiple electrode sheets together form an electrode portion 111, and the sub-tabs 112 of multiple electrode sheets are brought together and attached to each other to form the tab 112.

[0074] It should be noted that the specific structural form of the aforementioned electrode sheet has been disclosed in related technologies and will not be repeated here.

[0075] The pole post 12 is used for electrical connection with the tab 112. Therefore, the tab 112 and the pole post 12 are located on the same side of the electrode portion 111 along the first direction.

[0076] The electrical connection between tab 112 and pole post 12 refers to the connection between the two through welding or other methods.

[0077] The first direction is the straight line direction in which the tensile force on the electrode assembly 11 and the electrode post 12 is located.

[0078] When the pole post 12 and the electrode plate portion 111 are subjected to tensile force and tend to move relatively away from each other in the first direction, the tensile force is transmitted to the tab 112. Due to the blocking effect of the support surface 1222a on the tab 112 in the first direction, the force between the pole post 12 and the tab 112 can act on the contact area between the support surface 1222a and the tab 112, so that the support surface 1222a can support the tab 112 in the first direction.

[0079] If the welding area of the tab 112 and the pole 12 is located within the range of the support surface 1222a and the fitting area of the tab 112, the welding area will only bear compressive stress but not tensile stress due to the support of the support surface 1222a to the tab 112; if the welding area of the tab 112 and the pole 12 is located outside the range of the support surface 1222a and the fitting area of the tab 112, both the welding area of the tab 112 and the pole 12 and the fitting area of the support surface 1222a and the tab 112 need to bear tensile force, and due to the support of the support surface 1222a to the tab 112, the tensile force borne by the welding area of the tab 112 and the pole 12 is reduced under the premise that the total tensile force is unchanged.

[0080] The battery cell 10 in the embodiment of the present disclosure is beneficial to making the force borne by the welding area compressive stress or reducing the size of the tensile force borne by the welding area, and thus beneficial to reducing the probability of force damage of the welding area, thereby improving the connection stability of the pole 12 and the tab 112 and improving the use safety of the battery cell 10.

[0081] The specific number of the support surface 1222a is not limited and can be one or multiple.

[0082] The specific shape of the support surface 1222a is not limited and can be a curved surface or a plane, and the specific shape is adapted to the shape of the tab 112.

[0083] It can be understood that in the case that the pole 12 bears tensile force, the relative position between the support surface 1222a and the tab 112 needs to be constrained to reduce the probability of relative sliding between the two and thus causing disengagement.

[0084] For example, referring to FIGS. 5 and 6, the inner wall of the mounting space 12a on the side close to the pole piece part 111 along the first direction extends perpendicularly to the first direction.

[0085] That is, the support surface 1222a is a plane and the normal direction thereof is parallel to the first direction. Thus, in the case that the pole 12 bears tensile force along the first direction, the direction of the interaction force between the support surface 1222a and the tab 112 is perpendicular to the fitting surface of the two, so that no component force forming an included angle with the first direction is generated.

[0086] Therefore, the probability of relative movement between the tab 112 and the pole 12 in the direction perpendicular to the first direction is reduced, the relative position of the tab 112 and the pole 12 is kept stable, the tensile force on the welding area of the tab 112 and the pole 12 is further reduced, and the probability of welding failure between the tab 112 and the pole 12 is reduced.

[0087] In some embodiments, the abutting position of the support surface 1222a and the tab 112 is the welding position of the pole 12 and the tab 112.

[0088] The specific manner of forming the support surface 1222a is not limited.

[0089] For example, referring to FIGS. 5 and 6, the tab 112 is provided with a mounting space 12a, one side of the mounting space 12a is open to form an opening 12b communicating with the outside of the pole 12, and a part of the tab 112 extends into the mounting space 12a through the opening 12b. Part of the inner wall of the mounting space 12a forms the support surface 1222a.

[0090] The opening 12b communicates the mounting space 12a with the outside of the pole 12, so that a part of the tab 112 can enter the mounting space 12a from the outside of the pole 12 through the opening 12b during assembly of the battery monomer 10.

[0091] It can be understood that at least part of the inner wall of the mounting space 12a on the side close to the tab portion 111 in the first direction forms the support surface 1222a.

[0092] Therefore, the inner wall of the mounting space 12a helps the tab 112 to better restrain, and the shielding effect of the inner wall of the mounting space 12a reduces the risk of short circuit caused by impurities in the tab portion 111 entering the abutting position of the tab 112 and the support surface 1222a.

[0093] In addition to the inner wall of the mounting space 12a on the side close to the tab portion 111 in the first direction, the relative relationship between the other inner walls of the mounting space 12a and the tab 112 is not limited.

[0094] For example, referring to FIG. 5, the inner wall of the mounting space 12a on the side away from the tab portion 111 in the first direction is spaced apart from the tab 112 in the first direction. Therefore, it is beneficial to reduce the difficulty of the tab 112 extending into the mounting space 12a and moving during the assembly of the battery monomer 10, and facilitate the movement of the tab 112 to the predetermined mounting position.

[0095] For example, referring to FIG. 6, a portion of the tab 112 is clamped between the inner walls of the mounting space 12a along two sides in the first direction. That is, the inner walls of the mounting space 12a along two sides in the first direction can respectively apply opposite forces in the first direction to the tab 112.

[0096] In this way, on the one hand, the relative position between the pole post 12 and the tab 112 is kept stable by the friction between the inner walls of the mounting space 12a and the tab 112, reducing the probability of welding failure between the two; on the other hand, the contact area between the pole post 12 and the tab 112 is increased, which is conducive to improving the current carrying capacity between the pole post 12 and the tab 112.

[0097] In some embodiments, referring to FIGS. 5 and 6, the mounting space 12a is open toward the second direction, and the first direction intersects the second direction. That is, the opening 12b is located on one side of the mounting space 12a in the second direction, and the opening 12b does not directly face the tab portion 111.

[0098] In this way, the edge of the opening 12b can stop the tab 112 in the first direction, further helping the pole post 12 to stop the tab 112, reducing the tensile force on the welding area of the tab 112 and the pole post 12, and at the same time, reducing the probability of impurities in the battery monomer 10 entering the mounting space 12a through the opening 12b.

[0099] In some embodiments, referring to FIGS. 5 and 6, the mounting space 12a extends in the second direction. In this way, the tab 112 can move in the mounting space 12a after entering the mounting space 12a through the opening 12b, so that the tab 112 reaches the preset position and is attached to the pole post 12.

[0100] In some embodiments, the mounting space 12a extends linearly in the second direction to reduce the manufacturing difficulty of the mounting space 12a and reduce the manufacturing cost.

[0101] In some embodiments, the first direction is perpendicular to the second direction. In this way, the probability of impurities in the battery monomer 10 entering the mounting space 12a through the opening 12b is further reduced.

[0102] In some embodiments, referring to FIG. 9, the mounting space 12a is open along at least one side in the third direction, and the first direction, the second direction and the third direction intersect each other, so that the position of the tab 112 in the mounting space 12a can be easily observed from the communication position of the mounting space 12a in the third direction during the assembly of the battery monomer 10, and the position of the tab 112 is adjusted; at the same time, the part of the pole post 12 forming the support surface 1222a can also be displaced in the first direction under the force of the pole post 12, so as to reduce the force on the attachment position of the support surface 1222a and the tab 112.

[0103] In some embodiments, the first direction, the second direction and the third direction are perpendicular to each other.

[0104] In some embodiments, referring to FIG. 9, the mounting space 12a is open on both sides along the third direction, so that the displacement of the part of the pole 12 forming the support surface 1222a along the first direction under the force of the pole 12 further reduces the force on the fitted position of the support surface 1222a and the tab 112.

[0105] The structure forming the mounting space 12a is not limited.

[0106] For example, referring to FIGS. 5 and 6, the pole 12 includes a main body part 121 and a connecting part 122, the connecting part 122 is electrically connected with the main body part 121, a part of the connecting part 122 is spaced apart from the main body part 121 to form the mounting space 12a, and at least part of the surface of the part of the connecting part 122 forms the support surface 1222a.

[0107] The main body part 121 is at least used to connect with the busbar in the battery 100, so that the battery monomers 10 are connected in series and parallel with each other through the busbar.

[0108] The connecting part 122 is used to fit with the tab 112.

[0109] One end of the connecting part 122 is connected with the main body part 121, so that the two form a conductive path.

[0110] It can be understood that a part of the surface of the main body part 121 and a part of the surface of the connecting part 122 together form the inner wall of the mounting space 12a.

[0111] In this way, in the process of manufacturing the pole 12, the connecting part 122 and the mounting space 12a can be formed by bending a part of the pole 12, which is simple in manufacturing process and is conducive to reducing production cost.

[0112] It can be understood that the main body part 121 and the connecting part 122 are of an integrated structure.

[0113] It can be understood that the pole 12 is made of a metal material, and the ductility of the metal material is used to bend and deform the pole 12 to form the main body part 121 and the connecting part 122.

[0114] In some embodiments, referring to FIGS. 5 and 6, a part of the connecting part 122 extends along the second direction.

[0115] In some embodiments, referring to FIGS. 4 to 8, the mounting space 12a is located between the main body part 121 and the tab part 111.

[0116] That is, the mounting space 12a is formed between the connecting portion 122 and the main body portion 121 along the first direction, the main body portion 121 and the part of the surface of the connecting portion 122 together enclose the mounting space 12a along the first direction close to the end surface of the one end of the pole piece portion 111, and the opening 12b is located between the main body portion 121 and the pole piece portion 111.

[0117] In this way, the connecting portion 122 is close to the pole piece portion 111, so that the supporting surface 1222a is close to the pole piece portion 111, and the different sizes of the tab 112 are facilitated to realize the purpose of being attached to the supporting surface 1222a, and the adaptability of the pole 12 is improved.

[0118] The specific position of the connecting area of the main body portion 121 and the connecting portion 122 is not limited.

[0119] In some embodiments, referring to FIGS. 5, 6 and 8, the connecting area of the main body portion 121 and the connecting portion 122 is located at the end of the main body portion 121 along the first direction close to the pole piece portion 111.

[0120] In this way, the connecting portion 122 is close to the pole piece portion 111, so that the different sizes of the tab 112 are facilitated to realize the purpose of being attached to the supporting surface 1222a, and the adaptability of the pole 12 is improved.

[0121] It can be understood that the connecting portion 122 is arranged in a bent manner, which is beneficial to shorten the distance between the pole piece portion 111 and the main body portion 121 along the first direction, and make the structure of the battery monomer 10 more compact.

[0122] In some embodiments, referring to FIGS. 5 and 6, the connecting area of the main body portion 121 and the connecting portion 122 is located at the end of the main body portion 121 along the first direction close to the pole piece portion 111, and is located at the edge of the end perpendicular to the first direction.

[0123] In this way, the size of the part between the connecting portion 122 and the main body portion 121 along the first direction after the connecting portion 122 is bent is increased, so that the size of the supporting surface 1222a is increased, and the supporting effect of the connecting portion 122 on the tab 112 is more stable.

[0124] It can be understood that, referring to FIG. 5, the opening 12b is formed between the end of the connecting portion 122 away from the main body portion 121 along the extending direction of the connecting portion 122 and the main body portion 121.

[0125] It can be understood that, referring to FIG. 6, a part of the tab 112 is clamped between the main body portion 121 and the connecting portion 122 to realize the purpose that a part of the tab 112 is clamped between the inner walls on both sides of the mounting space 12a along the first direction.

[0126] It can be understood that, in order to facilitate the connection part 122 to be bent, the cross-sectional area of the connection part 122 perpendicular to the extending direction thereof is smaller than the cross-sectional area of the main body part 121 perpendicular to the first direction, and thus the flow capacity of the connection part 122 is relatively small.

[0127] In some embodiments, referring to FIGS. 7 and 8, the connection part 122 comprises a first sub-part 1221 and a second sub-part 1222, the first sub-part 1221 connects the second sub-part 1222 and the main body part 121, the second sub-part 1222 extends along the second direction and is spaced apart from the main body part 121 along the first direction, the first direction intersects the second direction, at least part of the surface of the second sub-part 1222 forms a support surface 1222a, and the cross-sectional area of the first sub-part 1221 increases from the end of the first sub-part 1221 close to the second sub-part 1222 to the end of the first sub-part 1221 close to the main body part 121 along the extending direction of the first sub-part 1221.

[0128] It can be understood that the support surface 1222a is located on the second sub-part 1222.

[0129] The cross-sectional area of the first sub-part 1221 refers to the cross-sectional area of the first sub-part 1221 at a certain position along the extending direction thereof perpendicular to the extending direction.

[0130] The second sub-part 1222 is attached to the tab 112, so that the current can be transmitted to the second sub-part 1222 through the tab 112, and then transmitted to the main body part 121 through the first sub-part 1221. In the process of transmitting the current from the end of the first sub-part 1221 close to the second sub-part 1222 to the end close to the main body part 121, the cross-sectional area of the first sub-part 1221 perpendicular to the extending direction thereof gradually increases. In this way, it is beneficial to deform the second sub-part 1222 relative to the first sub-part 1221 along the first direction, thereby absorbing the acting force through deformation and playing a buffering role, reducing the acting force transmitted to the support surface 1222a, and improving the connection stability of the tab 112 and the pole 12; it is beneficial to reduce the resistance at the connection position of the connection part 122 and the main body part 121, improve the flow capacity of the pole 12, and improve the charging and discharging performance of the battery monomer 10.

[0131] In the process of manufacturing the connection part 122, the second sub-part 1222 can be bent to rotate relative to the connection position thereof and the first sub-part 1221 until the installation space 12a is formed between the second sub-part 1222 and the main body part 121 along the first direction.

[0132] In some embodiments, the cross-sectional area of the second sub-part 1222 perpendicular to the second direction is equal at each position along the second direction, which is beneficial to simplify the structure of the second sub-part 1222 and facilitate manufacturing.

[0133] The specific way of measuring the cross-sectional area of the first sub-portion 1221 at any position along the extension direction thereof is not limited, for example, at room temperature 25°C, the pole post 12 is placed in the measurement area of the projection measuring instrument, the first sub-portion 1221 is cut perpendicularly to the extension direction of the first sub-portion 1221 to expose the cross-section to be measured, and then the area of the cross-section is measured by the projection measuring instrument.

[0134] In some embodiments, the cross-sectional area of the first sub-portion 1221 at any position perpendicularly to the extension direction of the connecting portion 122 is greater than the cross-sectional area of the connecting sub-portion at any position perpendicularly to the extension direction of the connecting portion 122, so that the structural strength of the first sub-portion 1221 is greater than the structural strength of the connecting sub-portion. In this way, it is beneficial to reduce the probability of the first sub-portion 1221 being deformed by the bending force during the bending process of the connecting portion 122, and to reduce the probability of the main body portion 121 being adhered to during the bending process of the connecting portion 122, so that the mounting space 12a cannot be formed.

[0135] The specific position of the first sub-portion 1221 is not limited.

[0136] For example, referring to FIG. 8, the first sub-portion 1221 is arranged at the end surface of the main body portion 121 near one end of the first direction of the tab portion 111.

[0137] In this way, it is beneficial to make the second sub-portion 1222 close to the tab portion 111, and further beneficial to make the mounting space 12a close to the tab portion 111, and beneficial to the tab 112 of different sizes to extend into the mounting space 12a and adhere to the support surface 1222a.

[0138] In the embodiment in which the first sub-portion 1221 is arranged at the end surface of the main body portion 121 along the first direction, referring to FIG. 8, the first sub-portion 1221 extends along the first direction, and in the projection plane perpendicular to the first direction, the projection of the connection area of the first sub-portion 1221 and the second sub-portion 1222 is located within the projection range of the connection area of the first sub-portion 1221 and the main body portion 121.

[0139] That is, the buffer portion is substantially in the shape of a cone.

[0140] In this way, it is beneficial to improve the structural strength of the first sub-portion 1221, and beneficial to reduce the probability of the first sub-portion 1221 being deformed by the bending force during the bending process of the connecting portion 122, and to reduce the probability of the main body portion 121 being adhered to during the bending process of the connecting portion 122, so that the mounting space 12a cannot be formed.

[0141] In some embodiments, referring to FIG. 8, the distance between the center position of the connecting region of the first sub-portion 1221 and the second sub-portion 1222 and the center position of the end surface of the main body portion 121 close to one end of the pole piece portion 111 along the first direction is not greater than 10 mm (millimetres) in the direction perpendicular to the first direction. That is, L1≤10 mm.

[0142] The center position of the end surface of the main body portion 121 close to one end of the pole piece portion 111 along the first direction refers to the geometric center of the projected shape of the end surface of the main body portion 121 close to one end of the pole piece portion 111 along the first direction in the projection plane perpendicular to the first direction.

[0143] The center position of the connecting region of the first sub-portion 1221 and the second sub-portion 1222 refers to the geometric center of the cross-sectional shape of the connecting position of the second sub-portion 1222 and the first sub-portion 1221.

[0144] L1 is the straight-line distance between the projection point of the center position of the end surface of the main body portion 121 close to one end of the pole piece portion 111 along the first direction in the projection plane perpendicular to the first direction and the projection point of the center position of the connecting region of the first sub-portion 1221 and the second sub-portion 1222.

[0145] In this way, the first sub-portion 1221 is close to the center position of the end surface of the main body portion 121 close to one end of the pole piece portion 111 along the first direction, so that after the current flows from the first sub-portion 1221 to the main body portion 121, the cross-sectional area of the current flow region can rapidly expand, thereby facilitating the reduction of the resistance of the current flow region and the improvement of the current carrying capacity of the pole 12.

[0146] The specific shape of the first sub-portion 1221 provided on the end surface of the main body portion 121 close to one end of the pole piece portion 111 along the first direction is not limited, for example, circular, rectangular, etc.

[0147] The specific shape of the buffer portion is not limited, for example, a circular cone, a multi-prism, etc.

[0148] The specific way of measuring the size of L1 is not limited. For example, in the embodiment in which the first sub-portion 1221 is provided on the circular end surface of the main body portion 121 close to one end of the pole piece portion 111 along the first direction and the buffer portion is a circular cone, the pole 12 is placed in the measurement region of the projection measuring instrument at room temperature 25℃, the pole 12 is projected along the first direction to obtain the projection of the end surface of the main body portion 121 close to one end of the pole piece portion 111 along the first direction, and the first circle center position is recorded. The connecting position of the first sub-portion 1221 and the second sub-portion 1222 is cut perpendicular to the first direction to obtain the connecting position of the first sub-portion 1221 and the second sub-portion 1222, and the second circle center position is recorded. The distance between the first circle center position and the second circle center position is measured by the projection measuring instrument.

[0149] The specific manner of manufacturing the second sub-portion 1222 is not limited. For example, the main body portion 121 and the first sub-portion 1221 both extend along the first direction, the blank forming the second sub-portion 1222 also extends along the first direction, and the blank is bent to extend along the preset second direction to form the second sub-portion 1222. In this way, the main body portion 121, the first sub-portion 1221, and the blank forming the second sub-portion 1222 all extend in the same direction, facilitating manufacturing.

[0150] In some embodiments, referring to FIGS. 4, 5, 7, and 8, the battery cell 10 includes a housing 13, the housing 13 has a receiving cavity 13a inside, a portion of an outer surface of the housing 13 protrudes along the first direction to form a protrusion 131, an end surface of the protrusion 131 along the first direction is provided with a mounting hole 13b, the mounting hole 13b is in communication with the receiving cavity 13a and the outside of the housing 13, the pole column 12 is arranged in the mounting hole 13b, and the connecting portion 122 is located in the internal space of the protrusion 131.

[0151] That is, the protrusion 131 has a hollow structure, and has a space for accommodating at least part of the tab portion 111 and part of the pole column 12, the space is part of the receiving cavity 13a, and the mounting space 12a is also located in the internal space of the protrusion 131.

[0152] In this way, it is beneficial to make the space for arranging the tab portion 111 in the receiving cavity 13a more regular, and reduce the probability of damage to the tab portion 111 caused by extrusion of the connecting portion 122 and the tab portion 111.

[0153] The specific structure of the housing 13 is not limited.

[0154] For example, referring to FIG. 10, the housing 13 includes a shell 133 and a cover plate 132 set, the shell 133 has a cavity inside, one side of the cavity is open, and the cover plate 132 set can be arranged on the open position of the cavity to jointly enclose a mounting cavity, and the pole column 12 is arranged in the cover plate 132 set.

[0155] It can be understood that, in the embodiment provided with the protrusion 131, the protrusion 131 is located on the cover plate 132 set.

[0156] In some embodiments, referring to FIG. 8, the main body portion 121 includes a first sub-portion 1211 and a second sub-portion 1212, the first sub-portion 1211 is located on a side of the second sub-portion 1212 away from the tab portion 111 along the first direction, the first sub-portion 1211 is made of a first conductive material, and the second sub-portion 1212 is made of a second conductive material.

[0157] In this way, the main body portion 121 is made of different materials, which is beneficial to reduce the manufacturing cost of the main body portion 121 while meeting the conductive performance.

[0158] The specific types of the first conductive material and the second conductive material are not limited, for example, the second conductive material is aluminum and the first conductive material is copper.

[0159] In some embodiments, the connecting portion 122 and the second sub-portion 1212 are both of the second conductive material, so that the connecting portion 122 and the second sub-portion 1212 are manufactured synchronously to simplify the production steps and reduce the production cost.

[0160] In some embodiments provided with the mounting space 12a, referring to FIG. 5, the tab 112 includes a fitting portion 1121 and a converging portion 1122, the converging portion 1122 connects the fitting portion 1121 and the tab portion 111, and a part of the fitting portion 1121 is bent to extend into the mounting space 12a through the opening 12b to fit with the support surface 1222a.

[0161] The converging portion 1122 refers to the area formed by the parts where the plurality of sub-tabs 112 converge with each other.

[0162] The fitting portion 1121 refers to the area formed by the parts where the plurality of sub-tabs 112 fit with each other after converging.

[0163] It can be understood that there are gaps between the sub-tabs 112 in the converging portion 1122, and the structural strength is lower than that of the fitting portion 1121, and the sub-tabs 112 in the converging portion 1122 are easy to deform under external force.

[0164] In this way, by fitting the fitting portion 1121 with the support surface 1222a, the total size of the tab 112 in the first direction is shortened, so that the structure of the battery monomer 10 is more compact; at the same time, compared with the converging portion 1122, the fitting portion 1121 has higher structural strength and is not easy to deform and separate from the support surface 1222a under the tensile force transmitted by the pole 12.

[0165] It can be understood that the fitting portion 1121 is welded with the pole 12.

[0166] The battery monomer 10 in a specific embodiment of the embodiments of the present disclosure is described as follows:

[0167] The battery cell 10 includes an electrode assembly 11 and a pole 12. The electrode assembly 11 includes a tab portion 111 and a tab 112 located on one side of the tab portion 111 in a first direction and connected to the tab portion 111. The pole 12 is provided on one side of the tab portion 111 in the first direction. The pole 12 includes a main body portion 121 and a connecting portion 122. The connecting portion 122 is electrically connected to the main body portion 121. A part of the connecting portion 122 is bent to form a mounting space 12a with the main body portion 121 in the first direction. One side of the mounting space 12a is open to form an opening 12b that communicates with the outside of the pole 12. A part of the tab 112 extends into the mounting space 12a through the opening 12b. A part of the inner wall of the mounting space 12a forms a support surface 1222a. A part of the tab 112 is in contact with the support surface 1222a. The support surface 1222a is located on the side of the part of the tab 112 that is close to the tab portion 111 in the first direction. The tab 112 is electrically connected to the pole 12. The support surface 1222a extends perpendicularly to the first direction. The mounting space 12a is located between the main body portion 121 and the tab portion 111. The connecting portion 122 includes a first sub-portion 1221 and a second sub-portion 1222. The second sub-portion 1222 extends in a second direction and is spaced apart from the main body portion 121 in the first direction. The first direction intersects the second direction. The first sub-portion 1221 connects the second sub-portion 1222 and the main body portion 121. The connection area of the first sub-portion 1221 and the second sub-portion 1222 forms a bending area of the connecting portion 122. At least part of the surface of the second sub-portion 1222 forms the support surface 1222a. In the extension direction of the first sub-portion 1221, the cross-sectional area of the first sub-portion 1221 increases from the end of the first sub-portion 1221 close to the second sub-portion 1222 to the end of the first sub-portion 1221 close to the main body portion 121. The first sub-portion 1221 is provided on the end surface of the main body portion 121 close to the tab portion 111 in the first direction. The first sub-portion 1221 extends in the first direction. In a projection plane perpendicular to the first direction, the projection of the connection area of the first sub-portion 1221 and the second sub-portion 1222 is located within the projection range of the connection area of the first sub-portion 1221 and the main body portion 121. The distance between the center position of the connection area of the first sub-portion 1221 and the second sub-portion 1222 and the center position of the end surface of the main body portion 121 close to the tab portion 111 in the first direction is not greater than 10 mm in a direction perpendicular to the first direction.

[0168] The battery 100 includes a box 20 and the battery cell 10 of any of the preceding embodiments. The box 20 has a receiving space 20a. The battery cell 10 is located in the receiving space 20a.

[0169] The box 20 provides a mounting position for the battery cell 10 and protects the battery cell 10.

[0170] Therefore, by using the battery cell 10 in the foregoing embodiments, the use safety of the battery cell 10 is improved by improving the connection stability of the pole 12 and the tab 112, and the use safety of the battery 100 as a whole is improved.

[0171] In some embodiments, referring to FIG. 11, the battery 100 further includes a busbar 30, and the number of the battery cells 10 is multiple, and the pole 12 of one battery cell 10 is electrically connected to the pole 12 of another battery cell 10 through the busbar 30.

[0172] The poles 12 of the battery cells 10 are electrically connected through the busbar 30, and the series and parallel connection of the battery cells 10 is achieved.

[0173] The pole 12 and the busbar 30 are connected through welding.

[0174] During the charging and discharging of the battery cell 10, the expansion of the battery cell 10 causes the busbar 30 to exert a tensile force on the pole 12 in the first direction, so that the support surface 1222a supports the tab 112 in the first direction.

[0175] The embodiments of the present disclosure further provide a power-using device, which includes the battery 100 in the foregoing embodiments, and the battery 100 serves as a power supply of the power-using device.

[0176] Therefore, by using the battery 100 in the foregoing embodiments, the use safety of the power-using device as a whole is improved.

[0177] The various embodiments / implementation manners provided by the present disclosure can be combined with each other without contradiction.

[0178] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the embodiments of the present disclosure. The embodiments of the present disclosure can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present disclosure shall be included in the protection scope of the embodiments of the present disclosure.

Claims

1. A battery cell, comprising: an electrode assembly including a tab portion and a tab, the tab being located on one side of the tab portion in a first direction and connected to the tab portion; a post provided on one side of the tab portion in the first direction, a part of a surface of the post forming a support surface; a part of the tab being in contact with the support surface, and the support surface being located on a side of the part of the tab close to the tab portion in the first direction, the tab being electrically connected to the post.

2. The battery cell of claim 1, wherein, The support surface extends perpendicularly to the first direction.

3. The battery cell of claim 1 or 2, wherein, The post is provided with a mounting space, one side of the mounting space being open to form an opening communicating with the outside of the post, a part of the tab extending into the mounting space through the opening, and a part of an inner wall of the mounting space forming the support surface.

4. The battery cell of claim 3, wherein, A part of the tab is clamped between the inner walls of the mounting space on both sides in the first direction.

5. The battery cell of claim 3 or 4, wherein, The mounting space is open toward a second direction, and the first direction intersects the second direction.

6. The battery cell of claim 5, wherein, The mounting space is open on at least one side in a third direction, and the first direction, the second direction, and the third direction intersect each other.

7. The battery cell of any one of claims 3-6, wherein, The post includes a main portion and a connecting portion, the connecting portion being electrically connected to the main portion, a part of the connecting portion being spaced apart from the main portion to form the mounting space, and at least a part of a surface of the part of the connecting portion forming the support surface.

8. The battery cell of claim 7, wherein, The mounting space is located between the main portion and the tab portion.

9. The battery cell of claim 7 or 8, wherein, A connecting region of the main portion and the connecting portion is located at an end of the main portion close to the tab portion in the first direction, and is located at an edge of the end perpendicularly to the first direction.

10. The battery cell of claim 9, wherein, The connecting portion includes a first sub-portion and a second sub-portion, the second sub-portion extending in a second direction and being spaced apart from the main portion in the first direction, the first direction intersecting the second direction, the first sub-portion connecting the second sub-portion and the main portion, at least a part of a surface of the second sub-portion forming the support surface, and a cross-sectional area of the first sub-portion increasing from an end of the first sub-portion close to the second sub-portion to an end of the first sub-portion close to the main portion in an extension direction of the first sub-portion.

11. The battery cell of claim 10, wherein, The first sub-portion is provided on an end surface of the main portion close to the tab portion in the first direction, and the first sub-portion extends in the first direction, and in a projection plane perpendicular to the first direction, a projection of a connecting region of the first sub-portion and the second sub-portion is located within a projection range of a connecting region of the first sub-portion and the main portion.

12. The battery cell of claim 11, wherein, A distance between a center position of the connecting region of the first sub-portion and the second sub-portion and a center position of the end surface of the main portion close to the tab portion in the first direction is not greater than 10 mm in a direction perpendicular to the first direction.

13. The battery cell of any one of claims 7-12, wherein, The battery cell comprises a shell, the shell is provided with a containing cavity inside, a part of the outer surface of the shell is protruded to form a protrusion along the first direction, the protrusion is provided with a mounting hole at one end surface along the first direction, the mounting hole is communicated with the containing cavity and the outside of the shell, the pole column is arranged in the mounting hole, and the connecting part is located in the internal space of the protrusion.

14. A battery, the battery comprising a box and the battery cell of any one of claims 1-13, the box is provided with a containing space, and the battery cell is located in the containing space.

15. The battery of claim 14, wherein, The battery further comprises a current collecting piece, the number of the battery cells is multiple, the pole column of one battery cell is electrically connected with the pole column of another battery cell through the current collecting piece.

16. An electric device, the electric device comprising the battery of claim 14 or 15, the battery is used as the power supply of the electric device.

Images