Battery cell, battery and electrical apparatus

Abstract

Disclosed in the present disclosure are a battery cell, a battery, and an electrical apparatus. The battery cell comprises a casing, an end cover, an electrode assembly and an electrical connection assembly, wherein the electrode assembly is accommodated in the casing, the end cover is provided with an electrode terminal, and the electrode terminal is electrically connected to the electrode assembly by means of the electrical connection assembly. The electrical connection assembly comprises a current collecting member and at least one adapter connected to the current collecting member, the adapter being engaged with the current collecting member.

Description

Battery cell, battery and electric device

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202421740513.1, filed on July 22, 2024, entitled “Battery cell, battery and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a battery cell, 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, and batteries are also increasingly used in the field of energy storage and the like.

[0005] In new energy vehicles equipped with batteries, the batteries can be used to provide power in whole or in part. In the field of energy storage, the batteries can be installed in an energy storage box or directly installed at a user side. An electrical connection assembly is usually arranged inside a battery cell in a battery, and the electrical connection assembly is used to connect an electrode assembly and an electrode terminal. In the assembly scene of the electrical connection assembly, there is an adverse situation of accidental separation and falling of an adapter and a current collector. Therefore, how to fix the adapter and the current collector is one of the subjects of research and development in the industry. SUMMARY

[0006] To solve the above technical problems, the present disclosure provides a battery cell, a battery and an electric device with high stability.

[0007] The present disclosure is implemented by the following technical solutions.

[0008] A first aspect of an embodiment of the present disclosure provides a battery cell, comprising a shell, an end cover, an electrode assembly and an electrical connection assembly, the electrode assembly is accommodated in the shell, and the end cover is provided with an electrode terminal; the electrode terminal and the electrode assembly are electrically connected through the electrical connection assembly; the electrical connection assembly comprises a current collector and at least one adapter connected to the current collector, and the adapter and the current collector are snap-connected.

[0009] Since the adapter stack and the current collector are snap-connected, the connection between the adapter and the current collector can be reinforced, the connection stability can be improved, the risk of falling during assembly can be reduced, and the assembly efficiency of the battery cell can be improved.

[0010] In some embodiments, the number of adapters is a plurality, and the adapters are stacked to form an adapter stack, and the adapter stack and the current collector are snap-connected.

[0011] Therefore, the plurality of adapters can form an adapter stack, the adapter stack can be suitable for bending deformation while enhancing structural strength, and the adapter stack is convenient to assemble into the shell. In addition, the plurality of adapters can also improve the overcurrent capacity of the electrical connection assembly.

[0012] In some embodiments, the recess is provided in the adapter stack, the protrusion is provided in the current collector, and the recess and the protrusion are matched to enable the adapter stack and the current collector to be clamped.

[0013] Since the protrusion and the recess can be matched and fixed, the clamped connection of the adapter stack and the current collector can be achieved by a simple structure, the fixing effect of the adapter stack and the current collector is enhanced, and the risk of separation and falling of the adapter stack and the current collector is reduced.

[0014] In some embodiments, the recess includes a through hole into which the protrusion can be inserted, and the through hole is provided in the adapter stack.

[0015] Since the recess can be a through hole, the protrusion can be conveniently inserted and play a precise positioning role, and the assembly speed of the adapter stack and the current collector can be improved.

[0016] In some embodiments, the protrusion includes a through portion located in the through hole and a bent portion connected to the through portion; the bent portion is in a bent state relative to the through portion; along a first direction, a portion of the adapter stack is located between the bent portion and the current collector, and the first direction is a layer thickness direction of the adapter stack.

[0017] Since the protrusion has the bent portion that can be bent, the relative movement of the adapter stack and the current collector in the layer thickness direction of the adapter stack can be effectively limited, the fixed connection between the adapter stack and the current collector is further enhanced, and the risk of separation and falling of the adapter stack and the current collector is reduced.

[0018] In some embodiments, the adapter stack has a first end connected to the current collector and a second end connected to the end cover, and the bent portion is bent toward the side where the first end is located.

[0019] Therefore, the adapter stack can be limited to move away from the clamped position, the restraint reaction force of the clamped position is further increased, the clamping effect is enhanced, and the risk of separation and falling of the adapter stack and the current collector is reduced.

[0020] In some embodiments, along the first direction, the current collector has a first surface towards the side where the adapter stack is located, and a second surface away from the side where the adapter stack is located, the protruding portion extends from the second surface and protrudes from the first surface; the bending portion bends relative to the through portion towards the second direction, the total length of the protruding portion is the sum of the length of the through portion along the first direction from the second surface and the length of the bending portion along the second direction, the length of the through portion along the first direction from the second surface is the sum of the thickness of the adapter stack and the thickness of the current collector portion, the length of the bending portion along the second direction is not less than 4mm and does not exceed the minimum distance between the edge of the through hole and the first end.

[0021] Since the length of the bending portion is in a suitable range, the bending portion with a suitable length can have a good clamping effect, the bending portion will not protrude from the first end to scratch other components, and the production cost and processing difficulty can be reduced.

[0022] In some embodiments, the length of the bending portion along the second direction is 45% to 55% of the minimum distance between the edge of the through hole and the first end.

[0023] In this way, the length of the bending portion can balance the clamping effect and the overcurrent effect of the electrical connection assembly, and the production cost can also be controlled.

[0024] In some embodiments, the thickness of the protruding portion is the same as the thickness of the current collector.

[0025] Since the thickness of the protruding portion is the same as the thickness of the current collector, the processing difficulty of the current collector can be reduced while the overcurrent capacity of the current collector is improved.

[0026] In some embodiments, the current collector has a notch, the protruding portion and the current collector are an integral piece, and one end of the protruding portion is connected to the end edge of the notch in the second direction.

[0027] Since the protruding portion is integrally formed with the current collector, the processing difficulty of the current collector can be reduced while the overcurrent capacity of the current collector is improved.

[0028] In some embodiments, the through hole is a long hole; along a third direction perpendicular to the first direction and the second direction, the length of the through hole is not less than the length of the protruding portion along the third direction.

[0029] Since the length of the through hole is not less than the length of the protruding portion, the protruding portion can be easily inserted into the rectangular through hole, the positioning effect is improved, and the assembly difficulty of the adapter stack and the current collector is further reduced.

[0030] In some embodiments, along the third direction, the difference between the length of the through hole and the length of the protruding portion is 1mm.

[0031] Therefore, the assembly efficiency and the precise positioning effect of the adapter stack and the current collector can be considered, and the relative movement of the adapter stack and the current collector in the direction perpendicular to the second direction can be prevented to some extent, and the clamping effect is further enhanced.

[0032] In some embodiments, the number of adapters included in the adapter stack is any natural number from 2 to 10.

[0033] Therefore, the adapter stack can be conveniently assembled into the shell after being bent, and the overcurrent capacity of the electrical connection assembly is further improved.

[0034] In some embodiments, the adapter stack and the current collector are fixed by welding.

[0035] Since the adapter stack and the current collector are connected and fixed by welding, the stability of the clamping and fixing can be further improved, the resistance of the electrical connection assembly is reduced, and the overcurrent capacity of the electrical connection assembly is improved.

[0036] In some embodiments, the battery monomer includes a cylindrical battery.

[0037] Since the battery monomer includes a cylindrical battery, the electrical connection assembly connecting the electrode terminal and the electrode assembly can be accommodated in the shell by bending and folding, and the assembly efficiency and reliability of the cylindrical battery are improved.

[0038] The second aspect of the embodiments of the present disclosure provides a battery, which includes a box body and at least one battery monomer of the first aspect of the embodiments of the present disclosure contained in the box body.

[0039] Since the battery includes the battery monomer disclosed in the first aspect of the embodiments of the present disclosure, the risk of separation and falling of the electrical connection assembly during assembly can be reduced, and thus the assembly efficiency and reliability of the battery can be improved.

[0040] The third aspect of the embodiments of the present disclosure provides a power consumption device, which includes the battery monomer of the first aspect of the embodiments of the present disclosure or the battery of the second aspect of the embodiments of the present disclosure for providing electric energy.

[0041] Since the power consumption device includes the battery monomer of the first aspect of the embodiments of the present disclosure or the battery of the second aspect of the embodiments of the present disclosure, the assembly efficiency and reliability of the battery can be improved, and the assembly efficiency and reliability of the power consumption device are further improved.

[0042] Inventive Effects

[0043] Through the present disclosure, the stability of the electrical connection assembly in the battery monomer can be enhanced, the risk of separation and falling of the current collector and the adapter can be reduced, and the assembly efficiency and reliability of the battery monomer are improved. BRIEF DESCRIPTION OF DRAWINGS

[0044] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to limit the present disclosure. The same reference numerals in different drawings identify the same components throughout the text. In the drawings:

[0045] Fig. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present disclosure;

[0046] Fig. 2 is a perspective exploded schematic diagram of a battery according to some embodiments of the present disclosure;

[0047] Fig. 3 is a perspective exploded schematic diagram of a battery cell according to some embodiments of the present disclosure;

[0048] Fig. 4 is a structural schematic diagram of an electrical connector not in a bent state according to some embodiments of the present disclosure;

[0049] Fig. 5 is a structural schematic diagram of an adapter stack according to some embodiments of the present disclosure;

[0050] Fig. 6 is a perspective exploded schematic diagram of an electrical connector in a bent state according to some embodiments of the present disclosure;

[0051] Fig. 7 is a structural schematic diagram of an adapter according to some embodiments of the present disclosure;

[0052] Fig. 8 is a structural schematic diagram of a current collector according to some embodiments of the present disclosure;

[0053] Legend of reference numerals 1000 - vehicle, 100 - battery, 101 - box body, 102 - cover body, 103 - lower box body, 200 - controller, 300 - motor, 1 - battery cell, 2 - shell, 3 - electrode assembly, 4 - end cover, 4A - electrode terminal, 5 - electrical connection assembly, 6 - current collector, 6A - positioning hole, 6B - groove, 6C - notch, 7 - adapter stack, 7A - first end, 7B - second end, 8 - engagement structure, 9 - protrusion, 9A - through portion, 9B - bent portion, 10 - through hole, 10A - first edge, 10B - second edge, 11 - first surface, 12 - second surface, 13 - adapter, 14 - welding area, 15 - terminal connection hole. DETAILED DESCRIPTION

[0054] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0055] 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.

[0056] 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 indicated technical features. 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.

[0057] 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.

[0058] 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 can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0059] In the description of the embodiments of the disclosure, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the disclosure and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed in a particular orientation, be operated or used, and therefore cannot be understood as limiting the embodiments of the disclosure.

[0060] In the description of the embodiments of the present disclosure, unless explicitly defined and limited otherwise, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or 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-mentioned terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0061] In the description of the embodiments of the present disclosure, unless explicitly defined and limited otherwise, 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 elements in contact without interaction force, or contact between two elements in contact with interaction force.

[0062] In the following, the present disclosure will be described in detail.

[0063] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0064] In the battery assembly scene, the electrode terminal arranged on the end cover needs to be connected with the electrode assembly through the electrical connection assembly, wherein the electrical connection assembly has the problem of unstable connection between the current collector and the adapter, which leads to falling off. Therefore, how to realize the stable connection between the current collector and the adapter becomes a problem.

[0065] Through research, it is found that if the adapter stack and the current collector are snap-fit connected, the structural stability of the electrical connection assembly can be easily improved, and the risk of separation and falling off of the current collector and the adapter stack can be effectively reduced.

[0066] Based on such design concept, the present disclosure designs a battery monomer, which comprises a shell, an end cover, an electrode assembly and an electrical connection assembly. The electrode assembly is accommodated in the shell, and the end cover is provided with an electrode terminal. The electrode terminal and the electrode assembly are electrically connected through the electrical connection assembly. The electrical connection assembly comprises a current collector and at least one adapter connected to the current collector, and the adapter and the current collector are snap-fit connected.

[0067] Since the adapter and the current collector are snap-fit connected, the connection between the adapter and the current collector can be reinforced, the connection stability can be improved, the risk of falling off during assembly can be reduced, and the assembly efficiency of the battery monomer can be further improved.

[0068] The battery cell provided by the embodiments of the present disclosure can be used as a battery in groups, and therefore the embodiments of the present disclosure also provide a battery comprising the battery cell described above. The battery can be used in, but is not limited to, an electrical device or an energy storage device.

[0069] The embodiments of the present disclosure also provide an electrical device comprising the battery cell or the battery described above. The electrical device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0070] The battery cell provided by the embodiments of the present disclosure can also be used as a battery in groups. The battery can be used in, but is not limited to, an energy storage power system, a vehicle, a ship or an aircraft, etc. The use of the battery can provide higher total energy.

[0071] In the following embodiments, for the convenience of description, the electrical device of an embodiment of the present disclosure is taken as a vehicle 1000 for example. The following is described in conjunction with the accompanying drawings.

[0072] FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present disclosure. The vehicle 1000 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or a range extended car, etc.

[0073] 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 source of the vehicle 1000. The vehicle 1000 can also comprise 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.

[0074] In some embodiments of the present disclosure, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0075] FIGS. 2 and 3 are perspective exploded schematic diagrams of the battery 100 provided by the embodiments of the present disclosure. As shown in FIGS. 2 and 3, the battery 100 comprises a lower box body 103, a cover body 102 and at least one battery cell 1. The cover body 102 is arranged above the lower box body 103, so as to form a containing space of the battery cell 10 between the lower box body 103 and the cover body 102.

[0076] In the battery 100, the battery cells 1 can be multiple, and the multiple battery cells 1 can be connected in series or in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 1 are connected in series and in parallel. The multiple battery cells 1 can be directly connected in series or in parallel or in a mixed manner, and the whole formed by the multiple battery cells 1 is placed in the accommodating space formed by the lower box body 103 and the cover body 102. Of course, the battery 100 can also be in the form that the multiple battery cells 1 are connected in series or in parallel or in a mixed manner to form a battery module, and the multiple battery modules are connected in series or in parallel or in a mixed manner to form a whole, and are accommodated in the accommodating space formed by the lower box body 103 and the cover body 102. The battery 100 can also include other structures, for example, the battery 100 can also include a current collecting component for realizing electrical connection between the multiple battery cells 1.

[0077] In the embodiments of the present disclosure, the battery cell 1 can be a secondary battery, which means that the battery cell can be used continuously by activating the active material through charging after discharging.

[0078] The battery cell 1 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.

[0079] Although not shown, the battery cell 1 generally includes an electrode assembly 3. The electrode assembly 3 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting to a certain extent, and at the same time allow the active ions to pass through.

[0080] In some embodiments, the electrode assembly 3 is provided with a tab (not shown), which can guide the current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0081] In some embodiments, the battery cell 1 can include a housing. The housing is used to encapsulate the electrode assembly 3 and components such as electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0082] As an example, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or other shapes of battery cells. The prismatic battery cell includes a square battery cell, a blade-shaped battery cell, a multi-prismatic battery, such as a hexagonal prismatic battery, etc., and the present disclosure is not particularly limited.

[0083] In some embodiments, as shown in FIG. 3, the shell comprises a shell body 2 and an end cover 4, the shell body 2 is provided with an opening, and the end cover 4 closes the opening to form a sealed space for accommodating the electrode assembly 3 and electrolyte and the like. The shell body 2 can be provided with one or more openings. The end cover 4 can also be provided with one or more openings.

[0084] In some embodiments, the shell can be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell serves to protect the electrode assembly, and a sealing bag is further included between the shell and the electrode assembly, which is used to package the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum plastic film.

[0085] In some embodiments, as shown in FIG. 3, at least one electrode terminal 4A is provided on the shell, and the electrode terminal 4A is electrically connected with the tab (not shown). The electrode terminal 4A can be directly connected with the tab or indirectly connected with the tab through an adapter component. The electrode terminal 4A can be provided on the end cover 4 or on the shell body 2.

[0086] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to FIGS. 3 to 8.

[0087] FIG. 3 is a perspective exploded schematic view of a battery cell according to some embodiments of the present disclosure; FIG. 4 is a schematic view of a structure of an electrical connector not in a bent state according to some embodiments of the present disclosure; FIG. 5 is a schematic view of a structure of an adapter stack according to some embodiments of the present disclosure; FIG. 6 is a perspective exploded schematic view of an electrical connector in a bent state according to some embodiments of the present disclosure; FIG. 7 is a schematic view of a structure of an adapter according to some embodiments of the present disclosure; and FIG. 8 is a schematic view of a structure of a current collector according to some embodiments of the present disclosure.

[0088] In some embodiments of the present disclosure, for the convenience of description, a first direction, a second direction, and a third direction are set, and the directions of the first direction, the second direction, and the third direction are directions intersecting with each other. Here, the directions intersecting with each other include directions perpendicular to each other. For the convenience of understanding the embodiments of the present disclosure, in the embodiments shown in FIGS. 3 to 8, the first direction, the second direction, and the third direction are described as directions perpendicular to each other, but it should be understood by those skilled in the art that the embodiments of the present disclosure are not limited to the case where the three directions are perpendicular to each other. In specific embodiments, the first direction can be the layer thickness direction of the adapter, the second direction can be the bending direction of the bending portion, and the third direction can be a direction perpendicular to the first direction and the second direction. For the convenience of description, as shown by the arrows in FIGS. 3 to 8, the direction in which the arrow X is located is the second direction, the direction in which the arrow Y is located is the third direction, and the direction in which the arrow Z is located is the first direction. Sometimes, the direction indicated by the arrow Z along the first direction is referred to as "up", and the opposite direction is referred to as "down"; the first direction also refers to the top-bottom direction.

[0089] The first aspect of the embodiments of the present disclosure provides a battery cell 1, the battery cell 1 comprising a shell 2, an end cover 4, an electrode assembly 3 and an electrical connection assembly 5, the electrode assembly 3 being accommodated in the shell 2, the end cover 4 being provided with an electrode terminal 4A; the electrode terminal 4A and the electrode assembly 3 are electrically connected through the electrical connection assembly 5; the electrical connection assembly 5 comprises a current collector 6 and an adapter 13 connected to the current collector 6, the adapter 13 and the current collector 6 are snap-fit connected.

[0090] The snap-fit refers to a state in which the adapter 13 and the current collector 6 at least partially overlap in the thickness direction of the adapter.

[0091] Optionally, the battery cell 1 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc., and has one or more end covers 4. In the specific embodiments shown in FIGS. 3-8, the battery cell 1 is in the shape of a cylinder.

[0092] Optionally, the end cover 4 can be provided with a positive electrode terminal and a negative electrode terminal, the positive electrode terminal can be electrically connected with the positive electrode tab, and the negative electrode terminal can be electrically connected with the negative electrode tab.

[0093] Optionally, the positive electrode terminal and the negative electrode terminal can be of any number, and the positive electrode terminal and the negative electrode terminal can be provided on the same end cover 4 or on different end covers 4.

[0094] Optionally, the electrical connection assembly 5 between the electrode terminal 4A and the electrode assembly 3 can be one or more.

[0095] In the embodiments of the present disclosure, the electrical connection assembly 5 comprises a current collector 6 and an adapter 13 connected to the current collector 6. Exemplarily, the current collector 6 can play a role of overcurrent, and the current collector 6 can be a disc-shaped current collector 6 or a sheet-shaped current collector 6, and the present disclosure does not limit the shape of the current collector 6.

[0096] In the embodiments of the present disclosure, the electrical connection assembly 5 comprises a current collector 6 and an adapter 13 connected to the current collector 6, and the current collector 6 and the adapter 13 can be directly connected or connected through an intermediate piece capable of conducting electricity.

[0097] In specific embodiments, the current collector 6 and the adapter 13 can be directly connected, as shown in FIGS. 4 and 5, the adapter 13 and the current collector 6 are snap-fit connected through a snap-fit structure 8.

[0098] Exemplarily, the snap-fit structure 8 can be a convex structure matched with a concave structure, a structure that snap-fits with each other. The snap-fit structure 8 can enhance the fixing effect of the adapter 13 and the current collector 6.

[0099] Optionally, the adapter 13 can be provided with a concave structure, and the current collector 6 is provided with a structure for clamping the concave structure; alternatively, the current collector 6 can be provided with a concave structure, and the adapter 13 is provided with a structure for clamping the concave structure.

[0100] Thus, reliable connection between the adapter 13 and the current collector 6 can be achieved by a simple structure, the connection stability of the electrical connection assembly 5 is improved, the risk of falling off during assembly is reduced, and the assembly efficiency of the battery monomer 1 is improved.

[0101] In the embodiments of the present disclosure, as shown in FIGS. 3, 4 and 5, the number of adapters 13 is multiple, and the adapters 13 are stacked to form an adapter stack 7, and the adapter stack 7 is clamped and connected with the current collector 6.

[0102] In specific embodiments, the adapters 13 are stacked along the thickness direction of the adapters to form the adapter stack 7. Thus, the adapter stack 7 can be adapted to bending deformation while enhancing the structural strength, facilitating assembly into the shell 2. In addition, the multiple adapters 13 can also improve the overcurrent capacity of the electrical connection assembly 5.

[0103] In the embodiments of the present disclosure, the number of adapters 13 included in the adapter stack 7 can be any natural number from 2 to 10. The number of adapters 13 can also be 1, in which case, one adapter 13 is clamped and connected with the current collector 6.

[0104] Optionally, the number of adapters 13 included in the adapter stack 7 can be any natural number from 2, 3, 4, 5, 6, 7, 8, 9 and 10.

[0105] Exemplarily, as shown in FIGS. 6 and 7, the thickness D of the adapter stack 7 is equal to the sum of the thicknesses d of n adapters 13, where n represents the number of adapters 13, and n is a natural number greater than or equal to 1, and further a natural number greater than or equal to 2. In specific embodiments, the adapter stack 7 includes 3 adapters 13 stacked.

[0106] Thus, the appropriate adapter stack 7 can be set according to the requirement for the overcurrent capacity of the electrical connection assembly 5. In the embodiments of the present disclosure, the battery monomer 1 is a cylindrical battery.

[0107] In specific embodiments, as shown in FIG. 3, the battery monomer 1 is a cylindrical battery, and the cylindrical battery can have two end covers 4, and each end cover 4 is provided with an electrode terminal 4A.

[0108] Exemplarily, the electrode terminals 4A of the two end covers 4 are respectively connected with the tabs of the electrode assembly 3 through the electrical connection assembly 5; alternatively, the electrode terminal 4A of one of the two end covers 4 is connected with the tab of the electrode assembly 3 through the electrical connection assembly 5, and the electrode terminal 4A of the other end cover 4 can be directly connected with the tab of the electrode assembly 3.

[0109] Optionally, in the cylindrical battery, the electrical connection assembly 5 can be connected only with the positive electrode tab or only with the negative electrode tab. Of course, in the cylindrical battery, two electrical connection assemblies 5 can be provided to be connected with the positive electrode tab and the negative electrode tab respectively. The present disclosure does not limit this.

[0110] Optionally, the electrical connection assembly 5 can be accommodated in the shell 2 by local folding, bending and the like. The present disclosure does not limit this.

[0111] Since the battery monomer 1 includes a cylindrical battery, the electrical connection assembly 5 connecting the electrode terminal 4A and the electrode assembly 3 can be accommodated in the shell 2, thereby improving the assembly efficiency and reliability of the cylindrical battery.

[0112] In the embodiment of the present disclosure, the recess is provided in the adapter stack 7, and the protrusion 9 is provided in the current collector 6. The recess cooperates with the protrusion 9 to make the adapter stack 7 and the current collector 6 clamped.

[0113] Optionally, the recess can be in the form of a hole or a groove, and the recess cooperates with the protrusion 9 to fix the adapter stack 7 and the current collector 6.

[0114] Alternatively, the protrusion 9 can be a convex structure such as a convex portion, a pin, a hook, a pawl or the like provided on the current collector 6, which can cooperate with the recess to form the clamping structure 8. Further alternatively, the protrusion 9 can be a local protruding structure of the current collector 6.

[0115] Optionally, the number of protrusions 9 can be one or more, and the number of recesses can be one or more. The number of protrusions 9 and the number of recesses can be the same or different. The plurality of protrusions 9 or recesses can be arranged in an array, or a suitable arrangement can be selected according to the shape of the adapter stack 7 or the current collector 6.

[0116] Optionally, a plurality of protrusions 9 can be clamped with one recess to enhance the fixing effect of the clamping structure 8.

[0117] Since the protrusion 9 and the recess can cooperate to be fixed, the clamping connection of the adapter stack 7 and the current collector 6 can be achieved by a simple structure, the fixing effect of the adapter stack 7 and the current collector 6 is strengthened, and the risk of separation and falling of the two is reduced.

[0118] In the embodiment of the present disclosure, as shown in FIG. 4, the recess includes a through hole 10 into which the protrusion 9 can be inserted, and the through hole 10 is provided in the adapter stack 7.

[0119] Optionally, the through hole 10 can be a circular, oblong, triangular, square or other polygonal hole. Optionally, the shape of the protruding part 9 can be the same as that of the through hole 10 when viewed in the first direction (Z direction), and the protruding part 9 can be engaged with the through hole 10 by interference fit or clearance fit, and the protruding part 9 can be a triangular prism, a cuboid or the like.

[0120] Optionally, the shape of the protruding part 9 can also be different from that of the through hole 10 when viewed in the first direction (Z direction), and the protruding part 9 can be engaged with the through hole 10 by a buckle, a jaw or the like.

[0121] The through hole 10 and the protruding part 9 are engaged, which prevents the protruding part 9 from being separated from the through hole 10 to some extent, and further prevents the current collecting piece 6 provided with the protruding part 9 from being separated from the adapter stack 7 provided with the through hole 10. In addition, since the recess can be a through hole 10, the protruding part 9 can be inserted conveniently while also playing a precise positioning role, effectively fixing the relative positions of the two.

[0122] In the embodiments of the present disclosure, as shown in FIGS. 4 and 5, the protruding part 9 includes a through part 9A located in the through hole 10 and a bending part 9B connected to the through part 9A; the bending part 9B is configured to be in a bent state relative to the through part 9A; along the first direction, a part of the adapter stack 7 is located between the bending part 9B and the current collecting piece 6, and the first direction is the layer thickness direction of the adapter stack 7.

[0123] Optionally, the bending part 9B can be bent in multiple directions relative to the through part 9A to be in a bent state, including but not limited to being close to the side where the current collecting piece 6 is located along the second direction (X direction) or being away from the side where the current collecting piece 6 is located along the second direction (X direction); when viewed in the first direction, the shape of the bending part 9B is not limited to an oblong shape, but can also be a square, trapezoidal, triangular or semicircular shape.

[0124] Optionally, the bending part 9B can also be bent along the third direction (Y direction). Of course, although other directions are not mentioned, they can also be bending directions of the bending part 9B.

[0125] Optionally, although not shown, one protruding part 9 can have multiple through parts and bending parts, and the multiple through parts and bending parts can be engaged with the through hole respectively.

[0126] In the bent state, a part of the adapter stack 7 is located between the bending part 9B and the current collecting piece 6, which can effectively limit the relative movement of the adapter stack 7 and the current collecting piece 6 in the first direction, and further fix the relative positions of the two.

[0127] Due to the bending portion 9B, the fixed connection between the adapter stack 7 and the current collector 6 can be further enhanced, and the risk of separation of the two can be reduced. In addition, the bending portion 9B can be in a bent state, which to some extent avoids the interference of the bending portion 9B with the arrangement of other components in the battery monomer 1, reduces the influence on the folding of the electrical connection assembly 5 in the shell 2, and improves the compactness of the layout of the battery monomer 1.

[0128] In specific embodiments, as shown in FIGS. 5 and 7, the adapter stack 7 has a first end 7A connected to the current collector 6 and a second end 7B connected to the end cover 4, and the bending portion 9B is bent towards the side where the first end 7A is located.

[0129] In specific embodiments, the first end 7A is in contact with and fixed to the current collector 6, and the second end 7B can be connected to the electrode terminal 4A.

[0130] For example, the adapter stack 7 can be provided with a terminal connection hole 15 at the second end 7B, and the electrode terminal 4A can be arranged in the connection hole, so as to realize the electrical connection between the electrode terminal 4A and the adapter stack 7, and then realize the electrical connection between the electrode terminal 4A and the electrode assembly 3 through the electrical connection assembly 5, so as to realize the external power supply through the electrode terminal 4A. At the same time, the arrangement of the terminal connection hole 15 can effectively fix the electrode terminal 4A.

[0131] For another example, the electrode terminal 4A can be connected and fixed to the adapter stack 7 by welding.

[0132] Optionally, although not shown, the adapter stack 7 can also be provided with a reinforcing rib to enhance the strength of the adapter stack 7, facilitate bending in other parts without reinforcing ribs, and make the adapter stack 7 more easily folded and stored in the shell 2.

[0133] Therefore, the bending direction of the bending portion 9B can further increase the constraint reaction force of the clamping structure 8, enhance the clamping effect of the clamping structure 8, limit the disengagement of the adapter stack 7 and the current collector 6, and reduce the risk of separation of the adapter stack 7 and the current collector 6.

[0134] In embodiments of the present disclosure, the through hole 10 is a long hole, and the length L1 of the through hole 10 in a third direction perpendicular to the first direction and the second direction is not less than the length L2 of the protruding portion 9 in the third direction.

[0135] Optionally, the through hole 10 can be an oblong hole or a rectangular hole (rectangular hole).

[0136] For example, as shown in FIG. 7, the through hole 10 is a rectangular hole. The long edges or short edges of the through hole 10 are parallel to the second direction (X direction).

[0137] Exemplarily, as shown in FIG. 7, the through hole 10 is a rectangular hole, having a first edge 10A with a longer length and a second edge 10B with a shorter length, wherein the second edge 10B is parallel to the second direction (X direction). This is conducive to the bending part 9B being able to hinder the relative movement of the adapter stack 7 and the current collector 6 along the second direction (X direction) in the bent state, further enhancing the constraint reaction force and the engagement effect, and reducing the risk of the adapter stack 7 and the current collector 6 separating and falling off.

[0138] When viewed along the first direction, the shape of the through part 9A can or can not be the same as the shape of the through hole 10, which is not limited in the present disclosure.

[0139] Exemplarily, as shown in FIG. 7 and FIG. 8, along the third direction (Y direction), the length L1 of the first edge 10A is not less than the length L2 of the protruding part 9. This makes it easy for the protruding part 9 to be inserted into the through hole 10.

[0140] In other embodiments, as shown in FIG. 7 and FIG. 8, along the second direction (X direction), the length D1 of the second edge 10B is also not less than the thickness D2 of the protruding part 9. This makes it easy for the protruding part 9 to be inserted into the through hole 10.

[0141] This facilitates the insertion of the protruding part 9 into the through hole 10, improves the positioning effect, and further reduces the assembly difficulty of the adapter stack 7 and the current collector 6.

[0142] In specific embodiments, along the third direction (Y direction), the difference between the length L1 of the through hole 10 and the length L2 of the protruding part 9 is 1 mm.

[0143] In this way, the length of the through hole 10 can achieve the effect of precise positioning, and can also to some extent prevent the relative movement of the adapter stack 7 and the current collector 6 along the third direction (Y direction), further enhancing the engagement effect.

[0144] In embodiments of the present disclosure, the current collector 6 has a first surface 11 on the side facing the adapter stack 7, and a second surface 12 on the side away from the adapter stack 7, the protruding part 9 extends from the second surface 12 and protrudes from the first surface 11, the bending part 9B is bent relative to the through part 9A towards the second direction, the total length H4 of the protruding part 9 is the sum of the length H3 of the through part 9A along the first direction from the second surface 12 and the length H2 of the bending part 9B along the second direction, the length H3 of the through part 9A along the first direction from the second surface 12 is the sum of the thickness D of the adapter stack 7 and the thickness D3 of the current collector 6, the length of the bending part 9B along the second direction is not less than 4 mm, and is not more than the minimum distance between the edge of the through hole 10 and the first end 7A.

[0145] Exemplarily, as shown in FIG. 3, FIG. 8, the current collector 6 has a first surface 11 and a second surface 12, the first surface 11 is located on the side where the adapter stack 7 is located, and the first surface 11 is clamped and fixed with the adapter stack 7, and the second surface 12 is connected with the electrode assembly 3.

[0146] Optionally, the current collector 6 is provided with a groove 6B and a positioning hole 6A. One or more grooves 6B can be provided. When viewed in the first direction (Z direction), the groove 6B can be arc-shaped or polyline-shaped.

[0147] Exemplarily, as shown in FIG. 8, the current collector 6 is provided with two polyline-shaped grooves 6B, the grooves 6B are located protruding from the second surface 12 and connected with the electrode assembly 3, which is conducive to subsequent welding and fixing.

[0148] Optionally, one or more positioning holes 6A can be provided, and the present disclosure does not limit the shape and layout of the positioning hole 6A.

[0149] Exemplarily, the positioning hole 6A can be in communication with the pressure relief component (not shown) of the end cover 4, which is conducive to pressure relief of the battery monomer 1 in the case of thermal runaway.

[0150] Exemplarily, the positioning hole 6A can also be in communication with the liquid injection hole (not shown) of the end cover 4, which can accelerate the flow of electrolyte to the electrode assembly 3 and make it easier to inject liquid.

[0151] Exemplarily, the positioning hole 6A can also correspond to the winding center hole (not shown) of the electrode assembly 3, which facilitates the positioning and installation of the electrical connection assembly 5.

[0152] Exemplarily, as shown in FIG. 5, FIG. 8, the full length H4 of the protruding portion 9 is the sum of the length H3 of the through portion 9A from the second surface 12 in the first direction (Z direction) and the length H2 of the bending portion 9B in the second direction (X direction).

[0153] Exemplarily, the length H3 of the through portion 9A from the second surface 12 in the first direction (Z direction) is the sum of the thickness D of the adapter stack 7 and the thickness D3 of the current collector 6. The through portion 9A extends from the second surface 12 and protrudes from the first surface 11, and needs to pass through the current collector 6 and the adapter stack 7. Optionally, the protruding portion 9 can be formed by shearing the current collector 6 and then folding it, or it can be formed by additionally providing the second surface 12. Exemplarily, during processing, the shearing device can cut two parallel slits on the current collector 6, and then the local part of the current collector 6 between the two slits is bent upwards in FIG. 8, thereby forming the protruding portion 9.

[0154] Exemplarily, as shown in FIG. 7 and FIG. 8, the through hole 10 has a first edge 10A, the distance between the first edge 10A and the first end 7A is H1, that is, the minimum distance between the edge of the through hole 10 and the first end 7A. The length H2 of the bending portion 9B is not less than 4 mm and not more than the minimum distance H1 between the edge of the through hole 10 and the first end 7A.

[0155] Since the length of the bending portion 9B is in the appropriate range, when the bending portion 9B of the protruding portion 9 is in the bent state, the bending portion 9B with the appropriate length can play a good clamping effect, the bending portion 9B will not protrude from the first end 7A to scratch other components, and the production cost and processing difficulty can be reduced. In addition, the length of the through portion 9A can also make the through portion 9A easily pass through the through hole 10, and facilitate the bending of the bending portion 9B.

[0156] In the embodiments of the present disclosure, the thickness D2 of the protruding portion 9 is the same as the thickness D3 of the current collector 6.

[0157] Exemplarily, as shown in FIG. 8, along the second direction (X direction), the thickness of the protruding portion 9 is D2. Along the first direction (Z direction), the thickness of the current collector 6 is D3. The thickness D2 of the protruding portion 9 is the same as the thickness D3 of the current collector 6.

[0158] Since the thickness D2 of the protruding portion 9 is the same as the thickness D3 of the current collector 6, the flow capacity of the current collector 6 can be improved while reducing the processing difficulty of the current collector 6.

[0159] In specific embodiments, as shown in FIG. 8, the current collector 6 has a notch 6C, the protruding portion 9 is an integral part of the current collector 6, and one end of the protruding portion 9 is connected to the end edge of the notch 6C in the second direction.

[0160] Exemplarily, the protruding portion 9 is an integral part of the current collector 6, the protruding portion 9 can be formed by folding part of the current collector 6 at the notch 6C, so that the through portion 9A in the protruding portion 9 is connected to the end edge of the notch 6C in the second direction, and the protruding portion 9 extends from the second surface 12 and protrudes from the first surface 11.

[0161] Thus, the flow capacity of the current collector 6 can be improved while reducing the processing difficulty of the current collector 6.

[0162] In specific embodiments, the length H2 of the bending portion 9B along the second direction is 45% to 55% of the minimum distance H1 between the edge of the through hole 10 and the first end 7A.

[0163] Alternatively, the length H2 of the bending portion 9B along the second direction can be 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55% of H1.

[0164] Exemplarily, the length H2 of the bending part 9B in the second direction can be 50% of H1. The bending part 9B has a good clamping effect.

[0165] In this way, the length of the bending part 9B is in a suitable range, the length H2 of the bending part 9B can further take into account the clamping effect of the clamping structure 8 and the overcurrent effect of the electrical connection assembly 5, and the production cost can also be controlled.

[0166] In a specific embodiment, the adapter stack 7 and the current collector 6 are fixed by welding.

[0167] Exemplarily, as shown in FIG. 5, the adapter stack 7 is provided with a welding area 14, and the adapter stack 7 is fixed by welding after being clamped with the current collector 6.

[0168] Optionally, although not shown, a plurality of sub-welding areas 14 can be provided in the welding area 14, and the number and arrangement of the sub-welding areas 14 are not limited in the present disclosure.

[0169] Optionally, the clamping structure 8 can be provided in the welding area 14, or can be provided in a part outside the welding area 14, which is not limited in the present disclosure.

[0170] Optionally, the welding method can be ultrasonic welding, which has the characteristics of high welding efficiency and low welding cost.

[0171] Optionally, the welding method can be direct full welding, or can be pre-welding on part of the contact part, and then full welding on all contact parts.

[0172] Since the adapter stack 7 and the current collector 6 are connected and fixed by welding when the adapter 13 is in the clamped state, the stability of the fixing of the two can be further improved, the resistance of the electrical connection assembly 5 can be reduced, and the overcurrent capacity of the electrical connection assembly 5 can be improved.

[0173] The second aspect of the embodiment of the present disclosure provides a battery 100, which includes a box body 101 and at least one battery cell 1 of the first aspect of the embodiment of the present disclosure contained in the box body 101. As shown in FIG. 2, the box body 101 can include a cover body 102 and a lower box body 103.

[0174] Since the battery 100 includes the battery cell 1 disclosed in the first aspect of the embodiment of the present disclosure, the risk of separation and falling of the electrical connection assembly 5 during assembly can be reduced, and thus the assembly efficiency and reliability of the battery 100 can be improved.

[0175] The third aspect of the embodiment of the present disclosure provides a power utilization device, which includes the battery cell 1 of the first aspect of the embodiment of the present disclosure or the battery 100 of the second aspect of the embodiment of the present disclosure for providing electric energy.

[0176] Since the power device includes the battery monomer 1 disclosed in the first aspect of the embodiments of the present disclosure or the battery 100 disclosed in the second aspect of the embodiments of the present disclosure, the assembly efficiency and reliability of the battery 100 can be improved, and the assembly efficiency and reliability of the power device are further improved.

[0177] The specific embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0178] In order to prevent the adapter stack 7 and the current collector from falling off in the battery cell production process after false welding, the present disclosure provides a battery monomer 1, which uses a physical fixing and welding fixing scheme to reinforce the adapter stack 7 and the current collector 6 in the battery monomer 1.

[0179] A through hole 10 in the shape of a rectangle is formed at the end of each adapter 13 (in the welding area 14 of the current collector 6), and the n layers of adapters 13 are stacked into an adapter stack 7.

[0180] The thickness of the single-layer adapter 13 is d, there are n layers of adapters 13, the thickness of the adapter stack 7 is D, and D=n*d. L1 is the length of the first edge 10A of the through hole 10; D1 is the length of the second edge 10B of the through hole 10; and H1 is the minimum distance from the first end 7A of the through hole 10.

[0181] A protruding portion 9 is arranged at the first end 7A of the second surface 12 of the current collector 6, the protruding direction is along the first direction towards the side where the end cover 4 is located, and the protruding portion 9 can be formed by shearing the current collector 6 and then folding it. The thickness D2 of the protruding portion 9 is equal to the thickness D3 of the current collector 6; the total length of the protruding portion 9 is H4, H4=D+D3+1 / 2*H1, so that the protruding portion 9 can be folded again after being matched with the adapter stack 7; along the second direction, the width of the protruding portion 9 is L2, L2(mm)=L1-1, so that the protruding portion 9 is matched with the through hole 10.

[0182] After the adapter stack 7 and the current collector 6 are assembled, the folding portion 9B of the protruding portion 9 is folded, the folding direction is towards the first end 7A, the folding presses and fixes the adapter stack 7 and the current collector 6, and then the overlapping area (welding area 14) of the adapter stack 7 and the current collector 6 is ultrasonically welded, which plays a secondary fixing role.

[0183] Since a physical reinforcement scheme is added to the original ultrasonic welding scheme for connecting the adapter 13 and the current collector 6, the problem of the adapter 13 and the current collector 6 falling off due to false welding during the production and assembly of the battery monomer 1 is prevented to some extent.

[0184] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure is described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure, and they should be covered in the scope of the claims and the specification of the present disclosure. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, comprising a housing, an end cap, an electrode assembly, and an electrical connection assembly, the electrode assembly being housed in the housing, the end cap being provided with an electrode terminal; the electrode terminal being electrically connected with the electrode assembly through the electrical connection assembly; the electrical connection assembly comprising a current collector and at least one adapter connected to the current collector, the adapter being snap-connected with the current collector. 2.The battery cell according to claim 1, wherein a plurality of adapters are stacked to form an adapter stack, the adapter stack being snap-connected with the current collector. 3.The battery cell according to claim 2, wherein a recess is provided on the adapter stack, and a protrusion is provided on the current collector, the recess and the protrusion being engaged to snap-connect the adapter stack with the current collector. 4.The battery cell according to claim 3, wherein the recess comprises a through hole into which the protrusion can be inserted, the through hole being provided on the adapter stack. 5.The battery cell according to claim 4, wherein the protrusion comprises a through portion located in the through hole and a bent portion connected to the through portion, the bent portion being bent relative to the through portion; in a first direction, a portion of the adapter stack is located between the bent portion and the current collector, the first direction being a thickness direction of the adapter stack. 6.The battery cell according to claim 5, wherein the adapter stack has a first end connected to the current collector and a second end connected to the end cap, the bent portion being bent toward the side where the first end is located. 7.The battery cell according to claim 5 or 6, wherein in the first direction, the current collector has a first surface toward the side where the adapter stack is located, and a second surface away from the side where the adapter stack is located, the protrusion extending from the second surface and protruding beyond the first surface; the bent portion is bent relative to the through portion in a second direction, a total length of the protrusion is a sum of a length of the through portion in the first direction from the second surface and a length of the bent portion in the second direction, the length of the through portion in the first direction from the second surface is a sum of a thickness of the adapter stack and a thickness of the current collector, the length of the bent portion in the second direction is not less than 4 mm and not more than a minimum distance between an edge of the through hole and the first end. 8.The battery cell according to claim 6 or 7, wherein the length of the bent portion in the second direction is 45%to 55%of the minimum distance between the edge of the through hole and the first end. 9.The battery cell according to any one of claims 3 to 8, wherein a thickness of the protrusion is the same as the thickness of the current collector. 10.The battery cell according to any one of claims 7 to 9, wherein the current collector has a notch, the protrusion is an integral part of the current collector, and one end of the protrusion is connected to an end edge of the notch in a second direction.

11. The battery cell according to any one of claims 7 to 10, wherein the through-hole is an elongated hole; a length of the through-hole in a third direction perpendicular to the first direction and the second direction is not less than a length of the protruding portion in the third direction.

12. The battery cell according to claim 11, wherein a difference between the length of the through-hole and the length of the protruding portion in the third direction is 1 mm.

13. The battery cell according to any one of claims 2 to 11, wherein the number of the adapter included in the adapter stack is any one of natural numbers from 2 to 10.

14. The battery cell of any one of claims 2-13, wherein, the adapter stack is fixed by welding to the current collector.

15. The battery cell of any one of claims 1-14, wherein, the battery cell is a cylindrical battery.

16. A battery comprising a case and at least one battery cell according to any one of claims 1 to 15 housed in the case.

17. An electric device comprising a battery cell according to any one of claims 1 to 15 or a battery according to claim 16 for providing electric power.

Images