Battery cell, battery, and electric device

Abstract

A battery monomer (20), a battery (100) and an electric device. The battery monomer (20) comprises a shell (21), an electrode assembly (22) and an electrode terminal (23). The shell (21) comprises a first wall (213); the electrode assembly (22) is arranged in the shell (21), and the electrode assembly (22) comprises a tab (221); the electrode terminal (23) is arranged on the first wall (213) and electrically connected with the tab (221). Wherein the electrode terminal (23) does not protrude from the outer surface (213a) of the first wall (213), which can improve the energy density of the battery.

Description

Battery cell, battery and electric device TECHNICAL FIELD

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

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the manufacturing process of the battery, the energy density of the battery is a problem that cannot be ignored. Therefore, how to improve the energy density of the battery is a technical problem that needs to be solved in the battery technology.

[0004] SUMMARY

[0005] The present application provides a battery cell, a battery and an electric device, which can improve the energy density of the battery.

[0006] The present application is achieved by the following technical solutions:

[0007] In a first aspect, the present application provides a battery cell, which comprises a shell, an electrode assembly and an electrode terminal. The shell comprises a first wall; the electrode assembly is arranged in the shell and comprises a tab; and the electrode terminal is arranged on the first wall and electrically connected to the tab. The electrode terminal does not protrude from the outer surface of the first wall.

[0008] According to the battery cell of the present application, the electrode terminal is arranged on the first wall and does not protrude from the outer surface of the first wall in the thickness direction of the first wall, so that the electrode terminal occupies a smaller assembly space in the thickness direction of the first wall, reduces the space occupation of the structure after the electrode terminal is connected to the conductor (such as the busbar) outside the battery cell, thereby improving the space utilization of the battery in the thickness direction of the first wall, and further improving the energy density of the battery.

[0009] According to some embodiments of the present application, the electrode terminal is recessed towards the inside of the battery cell relative to the outer surface of the first wall.

[0010] In the above scheme, the electrode terminal is recessed towards the inside of the battery cell relative to the outer surface of the first wall, further reducing the space occupation of the structure after the electrode terminal is connected to the conductor outside the battery cell in the thickness direction of the first wall, and improving the space utilization of the battery in the thickness direction of the first wall.

[0011] According to some embodiments of the present application, the electrode terminal has a first end surface facing away from the interior of the battery cell; the distance between the first end surface and the outer surface of the first wall in the thickness direction of the first wall is greater than 0 and less than or equal to 2 mm.

[0012] In the above scheme, the distance between the first end surface and the outer surface of the first wall in the thickness direction of the first wall satisfies the above relationship, which on the one hand can reduce the space occupation of the structure after the electrode terminal is connected with the external conductor of the battery cell, and on the other hand can reduce the space occupation of the electrode terminal in the interior of the battery cell.

[0013] According to some embodiments of the present application, the outer surface of the first wall forms a first recess recessed into the interior of the battery cell, and a part of the electrode terminal is accommodated in the first recess.

[0014] In the above scheme, a part of the electrode terminal is accommodated in the first recess, so as to facilitate the assembly of the electrode terminal and the first wall.

[0015] According to some embodiments of the present application, the first wall comprises a first body portion and a first protruding portion, the first protruding portion protrudes from the inner surface of the first body portion, the outer surface of the first wall forms the first recess at a position corresponding to the first protruding portion, and the electrode terminal does not protrude from the outer surface of the first body portion.

[0016] In the above scheme, the outer surface of the first body portion is the outer surface of the first wall, and the first protruding portion is arranged so that the electrode terminal can be arranged towards the interior of the battery cell, so as to facilitate the electrode terminal not to protrude from the outer surface of the first body portion.

[0017] According to some embodiments of the present application, the first protruding portion comprises a bottom wall and a peripheral wall surrounding the bottom wall, the peripheral wall connects the bottom wall and the first body portion, the bottom wall is provided with a first through hole, and a part of the electrode terminal is arranged in the first through hole.

[0018] In the above scheme, a part of the electrode terminal is arranged in the first through hole, so as to facilitate the electrode terminal to be arranged towards the interior of the battery cell and facilitate the assembly of the electrode terminal and the first wall.

[0019] According to some embodiments of the present application, the battery cell further comprises a connecting piece connected to the first wall, the connecting piece is annular, and the connecting piece is used to fix the electrode terminal to the first wall.

[0020] In the above scheme, the connecting piece is annular, and the connecting piece is sleeved on the electrode terminal, so as to facilitate the connecting piece to fix the electrode terminal to the first wall.

[0021] According to some embodiments of the present application, the battery cell further comprises a first insulating piece connected to the connecting piece and the electrode terminal, and the first insulating piece is used to separate the connecting piece and the electrode terminal.

[0022] In the above scheme, the first insulating member is annular, and the first insulating member is sleeved on the outside of the electrode terminal, so as to insulate and separate the connecting member and the electrode terminal.

[0023] According to some embodiments of the present application, the battery cell further comprises a second insulating member covering at least part of the outer surface of the first wall; the second insulating member has a second through hole, and the electrode terminal is arranged opposite to the second through hole along the thickness direction of the first wall.

[0024] In the above scheme, the second insulating member is used to insulate and separate the first wall and the external conductor of the battery cell. The electrode terminal is arranged opposite to the second through hole along the thickness direction of the first wall, so as to connect the electrode terminal and the external conductor of the battery cell.

[0025] According to some embodiments of the present application, the second insulating member is connected with the first insulating member.

[0026] In the above scheme, the second insulating member is connected with the first insulating member, so that the second insulating member and the first insulating member cooperate to insulate and separate the connecting member and the first wall from the electrode terminal and the external conductor.

[0027] According to some embodiments of the present application, along the thickness direction of the first wall, the projection of the second insulating member and the projection of the first insulating member have an overlapping area,

[0028] In the above scheme, the second insulating member and the first insulating member can have an overlapping area, so that the second insulating member and the first insulating member cooperate to insulate and separate the connecting member and the first wall.

[0029] According to some embodiments of the present application, the overlapping area is an annular area around the center line of the electrode terminal.

[0030] In the above scheme, the overlapping area is an annular area around the center line of the electrode terminal, and the second insulating member and the first insulating member have better insulation effect.

[0031] In a second aspect, the embodiments of the present application also provide a battery comprising a plurality of battery cells provided by any of the above embodiments and a current collecting member, and the electrode terminals of two adjacent battery cells are electrically connected by the current collecting member.

[0032] According to the battery of the embodiments of the present application, the two adjacent battery cells are electrically connected by the current collecting member, so as to facilitate the transmission of electric energy.

[0033] According to some embodiments of the present application, the current collecting member comprises a second body portion and a second protruding portion, the second body portion has a first surface facing the first wall and a second surface away from the first wall, and the second protruding portion protrudes from the first surface; the electrode terminal has a first end surface away from the inside of the battery cell, and the second protruding portion is connected to the first end surface.

[0034] In the above scheme, the second protrusion is arranged to facilitate the connection between the current collecting member and the first end surface, and facilitate the transmission of electric energy.

[0035] According to some embodiments of the present application, a second recess is formed on the side of the current collecting member away from the first wall, and the second recess is in position correspondence with the second protrusion.

[0036] In the above scheme, the second recess is in position correspondence with the second protrusion, facilitating the processing and manufacturing, for example, the current collecting member can form the second protrusion and the second recess by stamping.

[0037] According to some embodiments of the present application, the current collecting member further comprises a buffer portion, the buffer portion is arranged around the second protrusion, and the buffer portion connects the second body portion and the second protrusion.

[0038] In the above scheme, the buffer portion is arranged to buffer the stress received by the current collecting member, thereby reducing the pulling force of the current collecting member on the electrode terminal.

[0039] According to some embodiments of the present application, the second body portion is a flat plate structure, and the buffer portion is a bent structure.

[0040] In the above scheme, the second body portion is a flat plate structure, and the buffer portion is a bent structure, and when the current collecting member is subjected to external force, the bent structure can be deformed to buffer the stress.

[0041] According to some embodiments of the present application, the buffer portion comprises a third protrusion, the third protrusion is arranged around the second protrusion, the third protrusion protrudes from the second surface, the side of the current collecting member facing the first wall is formed with a third recess, the third recess is in position correspondence with the third protrusion; and / or, the buffer portion comprises a fourth protrusion, the fourth protrusion is arranged around the second protrusion, the fourth protrusion protrudes from the first surface, the side of the current collecting member away from the first wall is formed with a fourth recess, the fourth recess is in position correspondence with the fourth protrusion.

[0042] In the above scheme, the third protrusion and the third recess are arranged to buffer the stress received by the current collecting member. The fourth protrusion and the fourth recess are arranged to buffer the stress received by the current collecting member. When the current collecting member is formed with the third protrusion and the fourth protrusion, the third protrusion can be arranged around the fourth protrusion, or the fourth protrusion can be arranged around the third protrusion, further improving the buffering capacity of the current collecting member.

[0043] According to some embodiments of the present application, the battery monomer further comprises a second insulating member, the second insulating member covers at least a portion of the outer surface of the first wall; along the thickness direction of the first wall, the second insulating member is arranged between the first wall and the current collecting member, and the second insulating member is arranged in a spaced manner with the current collecting member.

[0044] In the above scheme, the second insulating member is arranged to insulate and separate the first wall and the busbar member; the second insulating member is arranged to be spaced from the busbar member, so as to reduce damage to the second insulating member when the busbar member moves.

[0045] According to some embodiments of the present application, the second insulating member has a second through hole, the diameter of the second through hole is greater than the diameter of the second protrusion, and a part of the second protrusion extends into the second through hole.

[0046] In the above scheme, the diameter of the second through hole is greater than the diameter of the second protrusion, so as to facilitate the second protrusion to connect with the electrode terminal after extending into the second through hole.

[0047] In a third aspect, the embodiments of the present application further provide a use electric device, which comprises the battery cell or the battery provided by any of the above embodiments, and the battery cell or the battery is used to provide electric energy.

[0048] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood by those skilled in the art through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0050] Fig. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0051] Fig. 2 is a structural exploded schematic diagram of a battery provided by some embodiments of the present application;

[0052] Fig. 3 is a structural exploded schematic diagram of a battery cell provided by some embodiments of the present application;

[0053] Fig. 4 is a sectional view of the battery cell provided by some embodiments of the present application;

[0054] Fig. 5 is a partial enlarged view of A in Fig. 4;

[0055] Fig. 6 is a top view of the battery cell provided by some embodiments of the present application;

[0056] Fig. 7 is a partial enlarged view of B in Fig. 6;

[0057] Fig. 8 is a partial structural schematic diagram of a battery provided by some embodiments of the present application;

[0058] Fig. 9 is a sectional view of a partial structure of the battery provided by some embodiments of the present application;

[0059] Fig. 10 is an enlarged view of a portion of Fig. 9 at C;

[0060] Fig. 11 is a partial cross-sectional view of a battery according to some embodiments of the present application;

[0061] Fig. 12 is a partial cross-sectional view of a battery according to other embodiments of the present application.

[0062] In the drawings, the drawings are not drawn to scale.

[0063] Label Explanation: 100 - battery; 10 - case; 11 - first sub-case; 12 - second sub-case; 20 - battery cell; 21 - housing; 211 - housing body; 212 - end cover; 213 - first wall; 213a - outer surface of first wall; 2131 - first recess; 2132 - first body portion; 2132a - inner surface of first body portion; 2132b - outer surface of first body portion; 2133 - first protrusion; 2133a - bottom wall; 2133b - peripheral wall; 2134 - first through-hole; 214 - second wall; 215 - third wall; 216 - fourth wall; 22 - electrode assembly; 221 - tab; 23 - electrode terminal; 231 - first end surface; 24 - adapter; 25 - connecting member; 26 - first insulating member; 261 - first connecting portion; 27 - second insulating member; 271 - second through-hole; 272 - overlapping region; 30 - busbar member; 31 - second body portion; 311 - first surface; 312 - second surface; 32 - second protrusion; 33 - second recess; 34 - buffer portion; 341 - third protrusion; 342 - third recess; 343 - fourth protrusion; 344 - fourth recess; 200 - controller; 300 - motor; 1000 - vehicle; J - radial direction of electrode terminal; X - first direction; Y - second direction; Z - thickness direction of first wall. DETAILED DESCRIPTION

[0064] In order to make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0065] 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 application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used in disclosing the application, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms used in the description of the present application are used for illustrative purposes only and are not intended to limit the scope of the application. The summary of the application and its teachings do not purport to be exhaustive or to be limited to a single embodiment, as the specialty of the application is described with reference to the appended drawings and claims.

[0066] 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 application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to one of ordinary skill in the art, embodiments described herein can be combined with one another.

[0067] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0068] The term "and / or" in the application is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the application generally represents that the front and rear associated objects have an "or" relationship.

[0069] "Multiple" appearing in the application means more than two (including two), and similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0070] In some embodiments, the battery can be a battery module, and when there are multiple battery monomers, the multiple battery monomers are arranged and fixed to form a battery module.

[0071] In some embodiments, the battery can be a battery pack, and the battery pack includes a box body and a battery monomer, and the battery monomer or the battery module is contained in the box body.

[0072] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, portions of the box can be part of a floor of the vehicle, or portions of the box can be part of cross members and longitudinal members of the vehicle.

[0073] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0074] In embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0075] The battery cell can be, but is not limited to, 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.

[0076] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode and can prevent the positive and negative electrodes from shorting to some extent while allowing the active ions to pass through.

[0077] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0078] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0079] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. with silver plating on the surface can be used. The composite current collector can include a high molecular material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0080] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries can also be used.

[0081] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0082] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, aluminum subjected to silver plating on the surface, stainless steel subjected to silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, or the like can be employed.

[0083] In some embodiments, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two surfaces of the negative electrode current collector.

[0084] As an example, the negative electrode active material can employ a negative electrode active material for a battery known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, lithium titanate, and the like. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material for a battery can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0085] In some embodiments, the separator is a separator film. The present application does not particularly limit the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0086] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate member located between the positive electrode and the negative electrode, or can be attached to the surface of the positive electrode or the negative electrode.

[0087] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive electrode and the negative electrode.

[0088] In some embodiments, the electrode assembly is a roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the roll structure.

[0089] In some embodiments, the electrode assembly is a stack structure.

[0090] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0091] In some embodiments, the housing includes a cover and a shell, the shell is provided with an opening, and the cover closes the opening to form a sealed space for accommodating the electrode assembly and electrolyte, etc. The shell can be provided with one or more openings. The cover can also be provided with one or more openings.

[0092] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through an adapter. The electrode terminal can be provided on the cover or on the shell.

[0093] In some embodiments, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0094] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, the housing can protect the electrode assembly and prevent electrolyte leakage, etc. When the housing is a non-sealed structure, the housing can protect the electrode assembly, and a sealing bag can be further included between the housing and the electrode assembly for encapsulating the electrode assembly and electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film.

[0095] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc.

[0096] The development of battery technology needs to consider various design factors, such as reliability, discharge capacity, charge-discharge rate, and other performance parameters, and also needs to consider the energy density of the battery.

[0097] In some embodiments, the battery cell includes a housing, an electrode terminal, and an electrode assembly, the housing includes a first wall, the electrode terminal is provided on the first wall, and the electrode assembly is provided in the housing. In order to facilitate the connection of the electrode terminal to the external conductor (e.g., a busbar) of the battery cell, the electrode terminal is usually protruded from the outer surface of the first wall. However, this will cause the electrode terminal to occupy a large assembly space on the outside of the first wall, resulting in a low space utilization rate of the battery in the thickness direction of the first wall, and thus a low energy density of the battery.

[0098] In view of this, the battery cell provided in the application includes a shell, an electrode assembly and an electrode terminal. The shell includes a first wall; the electrode assembly is arranged in the shell and includes a tab; and the electrode terminal is arranged on the first wall and electrically connected to the tab. The electrode terminal does not protrude from the outer surface of the first wall. The battery cell can improve the energy density of the battery.

[0099] In such a battery cell, the electrode terminal is arranged on the first wall and does not protrude from the outer surface of the first wall in the thickness direction of the first wall. In the battery, two battery cells are connected by a busbar, and the space occupied by the structure of the electrode terminal after being connected to the busbar in the thickness direction of the first wall is small, thereby improving the space utilization of the battery in the thickness direction of the first wall and further improving the energy density of the battery.

[0100] The battery disclosed in the embodiments of the application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. The power supply system of the electric device can be composed of the battery disclosed in the application.

[0101] The embodiments of the application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy and an electric aircraft toy, and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft.

[0102] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0103] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle provided in some embodiments of the application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid electric vehicle or a range extended electric vehicle. 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, for example, for the working power demand of the circuit system of the vehicle 1000, such as for the starting, navigation and running of the vehicle 1000.

[0104] 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, for the working power demand of the vehicle 1000 during starting, navigation and running.

[0105] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0106] Please refer to FIG. 2, which is a structural exploded view of a battery provided in some embodiments of the present application. The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is contained in the box body 10. The box body 10 is used to provide a containing space for the battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first sub-box body 11 and a second sub-box body 12, and the first sub-box body 11 and the second sub-box body 12 are mutually covered to jointly define a containing space for containing the battery cell 20. The second sub-box body 12 can be a hollow structure with one end open, and the first sub-box body 11 can be a plate-shaped structure, which is covered on the open side of the second sub-box body 12 to jointly define the containing space with the second sub-box body 12; or the first sub-box body 11 and the second sub-box body 12 can both be hollow structures with one side open, and the open side of the first sub-box body 11 is covered on the open side of the second sub-box body 12.

[0107] In the battery 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 20 is contained in the box body 10; of course, the battery 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is contained in the box body 10. The battery 100 can also include other structures, for example, the battery 100 can also include a current combing component for realizing the electrical connection between the multiple battery cells 20.

[0108] The battery cell 20 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0109] Please refer to FIG. 3, which is a structural exploded view of a battery cell provided in some embodiments of the present application. As shown in FIG. 3, the battery cell 20 includes an outer shell 21, an electrode assembly 22, and an electrode terminal 23. The outer shell 21 includes a shell body 211 and an end cover 212, and the shell body 211 has an opening, and the end cover 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0110] The shell 211 is a component for fitting with the end cover 212 to form an internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, electrolyte and other components. The shell 211 and the end cover 212 can be independent components. The shell 211 can be of various shapes and sizes. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0111] The end cover 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 212 can be adapted to the shape of the shell 211 to fit the shell 211. Optionally, the end cover 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 212 is not easily deformed when subjected to extrusion and collision, so that the battery cell 20 can have higher structural strength and reliability can also be improved. The end cover 212 can be provided with functional components such as electrode terminals 23. The electrode terminals can be used to electrically connect with the electrode assembly 22 for outputting or inputting the electrical energy of the battery cell 20. The material of the end cover 212 can also be various, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 212, which can be used to isolate the electrical connection components in the shell 211 from the end cover 212 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0112] The electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 22 can be contained in the shell 211. The electrode assembly 22 is mainly formed by winding or stacking the positive and negative electrode sheets, and generally has a separator film between the positive and negative electrode sheets, which is used to separate the positive and negative electrode sheets to avoid internal short circuit of the positive and negative electrode sheets to some extent. The positive and negative electrode sheets have a portion of active material constituting the main body of the electrode assembly 22, and the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs can be located at one end of the main body or at two ends of the main body respectively.

[0113] Please refer to FIG. 3, and further refer to FIG. 4 and FIG. 5, FIG. 4 is a sectional view of a battery cell provided by some embodiments of the present application, and FIG. 5 is an enlarged view of a portion A of FIG. 4. The embodiments of the present application provide a battery cell 20, which includes a housing 21, an electrode assembly 22, and an electrode terminal 23. The housing 21 includes a first wall 213; the electrode assembly 22 is disposed in the housing 21, and the electrode assembly 22 includes a tab 221; and the electrode terminal 23 is disposed on the first wall 213 and electrically connected to the tab 221. The electrode terminal 23 does not protrude from an outer surface 213a of the first wall.

[0114] The housing 21 has a receiving cavity for accommodating the electrode assembly 22, and the receiving cavity can be provided with an electrolyte.

[0115] The first wall 213 is one wall of the housing 21. The housing 21 can include a shell 211 and an end cover 212, the shell 211 has an opening, and the end cover 212 closes the opening. The first wall 213 can be one wall of the shell 211, or the first wall 213 can be the end cover 212.

[0116] In some embodiments, the first wall 213 can be the end cover 212.

[0117] In some embodiments, the shell 211 can be a cuboid, and the shell 211 can include two second walls 214 disposed opposite to each other along a first direction X, two third walls 215 disposed opposite to each other along a second direction Y, and a fourth wall 216, the second walls 214 connect the two third walls 215, the fourth wall 216 connects the two second walls 214 and the two third walls 215, and the ends of the two second walls 214 and the two third walls 215 away from the fourth wall 216 form an opening, the end cover 212 and the fourth wall 216 are disposed opposite to each other along a thickness direction Z of the first wall, the end cover 212 closes the opening, and the first direction X, the second direction Y, and the thickness direction Z of the first wall are perpendicular to each other. The first direction X can be parallel to a width direction of the battery cell 20, the second direction Y can be parallel to a length direction of the battery cell 20, and the thickness direction Z of the first wall can be parallel to a height direction of the battery cell 20.

[0118] The electrode assembly 22 can include a positive tab and a negative tab, the electrode terminal 23 can include a positive electrode terminal and a negative electrode terminal, and the battery cell 20 can further include a positive adapter and a negative adapter, the positive adapter electrically connects the positive tab and the positive electrode terminal, and the negative adapter electrically connects the negative tab and the negative electrode terminal.

[0119] The electrode terminal 23 is disposed on the first wall 213, and the electrode terminal 23 can be insulatively connected to the first wall 213.

[0120] The outer surface 213a of the first wall and the inner surface of the first wall 213 are oppositely arranged in the thickness direction Z of the first wall. The outer surface 213a of the first wall refers to a surface of the first wall 213 facing away from the inside of the battery cell 20. The inner surface of the first wall 213 refers to a surface of the first wall 213 facing the inside of the battery cell 20.

[0121] The electrode terminal 23 does not protrude from the outer surface 213a of the first wall, which means that, in the thickness direction Z of the first wall, the electrode terminal 23 is flush with the outer surface 213a of the first wall or lower than the outer surface 213a of the first wall.

[0122] In the process of assembling the battery, the electrode terminal 23 is connected to the conductor (such as the busbar) outside the battery cell 20, and the electrode terminal 23 is connected to the tab 221. When the electrode terminal 23 does not protrude from the outer surface 213a of the first wall, the assembly structure of the electrode terminal 23 and the conductor outside the battery cell 20 occupies a smaller space in the thickness direction Z of the first wall.

[0123] According to the battery cell 20 of the embodiments of the present application, the electrode terminal 23 is arranged on the first wall 213, and in the thickness direction Z of the first wall, the electrode terminal 23 does not protrude from the outer surface 213a of the first wall, so that the electrode terminal 23 occupies a smaller assembly space in the thickness direction Z of the first wall, reduces the space occupation of the structure after the electrode terminal 23 is connected to the conductor (such as the busbar) outside the battery cell 20, thereby improving the space utilization of the battery in the thickness direction Z of the first wall, and further improving the energy density of the battery.

[0124] Please refer to FIG. 5. According to some embodiments of the present application, the electrode terminal 23 is recessed towards the inside of the battery cell 20 relative to the outer surface 213a of the first wall.

[0125] In the thickness direction Z of the first wall, the electrode terminal 23 is lower than the outer surface 213a of the first wall, so that the electrode terminal 23 is recessed towards the inside of the battery cell 20 relative to the outer surface 213a of the first wall.

[0126] In the above scheme, the electrode terminal 23 is recessed towards the inside of the battery cell 20 relative to the outer surface 213a of the first wall, further reducing the space occupation of the structure after the electrode terminal 23 is connected to the conductor outside the battery cell 20 in the thickness direction Z of the first wall, and improving the space utilization of the battery in the thickness direction Z of the first wall.

[0127] Please refer to FIG. 5, according to some embodiments of the present application, the electrode terminal 23 has a first end surface 231 facing away from the inside of the battery monomer 20; the distance between the first end surface 231 and the outer surface 213a of the first wall in the thickness direction Z of the first wall is greater than 0 and less than or equal to 2mm.

[0128] The first end surface 231 is the end surface of the electrode terminal 23 away from the electrode assembly 22 in the thickness direction Z of the first wall.

[0129] For ease of description, the size indicated by the letter W can be the distance between the first end surface 231 and the outer surface 213a of the first wall in the thickness direction Z of the first wall, 0

[0130] The distance between the first end surface 231 and the outer surface 213a of the first wall in the thickness direction Z of the first wall is greater than 0, and the electrode terminal 23 can be arranged towards the inside of the battery monomer 20 to facilitate the electrical connection between the electrode terminal 23 and the tab 221.

[0131] The distance between the first end surface 231 and the outer surface 213a of the first wall in the thickness direction Z of the first wall is less than or equal to 2mm, and the size of the electrode terminal 23 extending into the inside of the battery monomer 20 can be smaller.

[0132] In the above scheme, the distance between the first end surface 231 and the outer surface 213a of the first wall in the thickness direction Z of the first wall satisfies the above relationship, on the one hand, when the distance between the first end surface 231 and the outer surface 213a of the first wall is greater than 0, the spatial occupation of the structure after the electrode terminal 23 is connected with the conductor outside the battery monomer 20 can be reduced, and the electrical connection between the electrode terminal 23 and the tab 221 is facilitated; on the other hand, when the distance between the first end surface 231 and the outer surface 213a of the first wall is less than or equal to 2mm, the space occupied by the electrode terminal 23 in the inside of the battery monomer 20 is reduced, and the influence on the energy density of the battery monomer 20 is reduced, and the battery monomer 20 can have a higher energy density.

[0133] Please refer to FIG. 5, according to some embodiments of the present application, the outer surface 213a of the first wall forms a first recess 2131 recessed towards the inside of the battery monomer 20, and a part of the electrode terminal 23 is accommodated in the first recess 2131.

[0134] The first recess 2131 is recessed towards the inside of the battery monomer 20 by the outer surface 213a of the first wall, and the first recess 2131 can be a groove formed in the first wall 213.

[0135] The battery cell 20 further comprises a transition piece 24 electrically connecting the electrode terminal 23 and the tab 221. A portion of the electrode terminal 23 is accommodated in the first recess 2131, and the first wall 213 can be provided with a through hole through which the electrode terminal 23 can be electrically connected with the transition piece 24.

[0136] In some embodiments, the electrode terminal 23 can be mounted in the first recess 2131 through an insulating structure to achieve insulation isolation of the electrode terminal 23 and the first wall 213.

[0137] In the above scheme, a portion of the electrode terminal 23 is accommodated in the first recess 2131 to facilitate assembly of the electrode terminal 23 and the first wall 213.

[0138] Referring to FIG. 5, according to some embodiments of the present application, the first wall 213 comprises a first body portion 2132 and a first protruding portion 2133 protruding from an inner surface 2132a of the first body portion, and an outer surface 213a of the first wall is formed with the first recess 2131 at a position corresponding to the first protruding portion 2133, and the electrode terminal 23 does not protrude from an outer surface 2132b of the first body portion.

[0139] The inner surface 2132a of the first body portion and the outer surface 2132b of the first body portion are oppositely arranged in a thickness direction of the first body portion 2132, and the thickness direction of the first body portion 2132 is parallel to the thickness direction Z of the first wall. The outer surface 2132b of the first body portion can be the outer surface 213a of the first wall.

[0140] In the thickness direction Z of the first wall, the first protruding portion 2133 protrudes from the inner surface 2132a of the first body portion, and the first protruding portion 2133 is arranged towards the inside of the battery cell 20. The first protruding portion 2133 and the first recess 2131 are correspondingly arranged in the thickness direction Z of the first wall, and the first wall 213 can be stamped from a plate-shaped structure.

[0141] In the thickness direction Z of the first wall, the first protruding portion 2133 protrudes from the inner surface 2132a of the first body portion, and the first protruding portion 2133 is arranged towards the inside of the battery cell 20. The first protruding portion 2133 and the first recess 2131 are correspondingly arranged in the thickness direction Z of the first wall, and the first wall 213 can be stamped from a plate-shaped structure.

[0142] In the above scheme, the outer surface 2132b of the first body portion is the outer surface 213a of the first wall, and the first protruding portion 2133 is arranged so that the electrode terminal 23 can be arranged towards the inside of the battery cell 20 to facilitate the electrode terminal not protruding from the outer surface 2132b of the first body portion.

[0143] Referring to FIG. 5, according to some embodiments of the present application, the first protrusion 2133 comprises a bottom wall 2133a and a peripheral wall 2133b surrounding the bottom wall 2133a, the peripheral wall 2133b connecting the bottom wall 2133a and the first body portion 2132, the bottom wall 2133a being provided with a first through hole 2134, and a portion of the electrode terminal 23 being arranged in the first through hole 2134.

[0144] In some embodiments, the bottom wall 2133a can be arranged in parallel with the first body portion 2132, and the bottom wall 2133a can be perpendicular to the thickness direction Z of the first wall. The peripheral wall 2133b is arranged around the bottom wall 2133a, and the inner surface of the peripheral wall 2133b and the bottom wall 2133a form the first recess 2131.

[0145] The first through hole 2134 penetrates the bottom wall 2133a along the thickness direction Z of the first wall, so that the first recess 2131 is in communication with the inside of the battery monomer 20.

[0146] In the thickness direction Z of the first wall, from the outer surface 2132b of the first body portion to the inner surface 2132a of the first body portion, one end of the electrode terminal 23 facing the electrode assembly 22 can or can not protrude from the bottom wall 2133a. For example, the one end of the electrode terminal 23 facing the inside of the battery monomer 20 can protrude from the first through hole 2134, or can be located in the first through hole 2134.

[0147] In the above scheme, a portion of the electrode terminal 23 is arranged in the first through hole 2134, which facilitates the arrangement of the electrode terminal 23 towards the inside of the battery monomer 20, and facilitates the assembly of the electrode terminal 23 and the first wall 213.

[0148] Referring to FIG. 5, according to some embodiments of the present application, the battery monomer 20 further comprises a connecting piece 25 connected to the first wall 213, the connecting piece 25 being annular, and the connecting piece 25 being used for fixing the electrode terminal 23 to the first wall 213.

[0149] In some embodiments, the connecting piece 25 can be connected to the first wall 213 in various ways, such as welding, riveting, etc.

[0150] Optionally, the connecting piece 25 can be welded to the first wall 213, so that the connecting piece 25 is firmly connected to the first wall 213.

[0151] In the above scheme, the connecting piece 25 is annular, the connecting piece 25 is sleeved on the electrode terminal 23, so as to facilitate the assembly with the electrode terminal 23, and the connecting piece 25 is used for fixing the electrode terminal 23 to the first wall 213, so as to achieve the fixation of the electrode terminal 23.

[0152] Referring to FIG. 5, according to some embodiments of the present application, the battery cell 20 further comprises a first insulating member 26 connected to the connecting member 25 and the electrode terminal 23, and the first insulating member 26 is configured to separate the connecting member 25 and the electrode terminal 23.

[0153] In some embodiments, the connecting member 25 can be a metal member, and the connecting member 25 has a high strength so as to be firmly assembled with the electrode terminal 23.

[0154] The first insulating member 26 is annular, and the first insulating member 26 is sleeved on the outside of the electrode terminal 23, and the connecting member 25 is sleeved on the first insulating member 26.

[0155] The first insulating member 26 can be made of plastic, rubber, etc.

[0156] In the above scheme, the first insulating member 26 is annular, and the first insulating member 26 is sleeved on the outside of the electrode terminal 23 so as to insulate and separate the connecting member 25 and the electrode terminal 23.

[0157] According to some embodiments of the present application, along the radial direction J of the electrode terminal, the first insulating member 26 is located between the connecting member 25 and the electrode terminal 23 so as to insulate and separate the electrode terminal 23 and the connecting member 25.

[0158] According to some embodiments of the present application, the first insulating member 26 has a first connecting portion 261 connected to the electrode terminal 23, and the first connecting portion 261 is sleeved on the outer circumferential surface of the electrode terminal 23. From the inner surface of the first wall 213 to the outer surface 213a of the first wall, the first end surface 231 does not protrude from the first connecting portion 261, and optionally, the first end surface 231 is flush with one end of the first connecting portion 261 which is away from the inside of the battery cell 20.

[0159] The outer circumferential surface of the electrode terminal 23 surrounds the periphery of the first end surface 231.

[0160] In some embodiments, the first insulating member 26 is in contact with the electrode terminal 23 and the connecting member 25 respectively, and the first insulating member 26 provides support for the electrode terminal 23. When two adjacent battery cells 20 are connected by the busbar 30 (see FIG. 9), in the case that the busbar 30 is subjected to a force along the radial direction of the electrode terminal 23, since the first insulating member 26 is arranged between the electrode terminal 23 and the connecting member 25, the torque applied by the busbar 30 to the electrode terminal 23 can be resisted by the first insulating member 26, thereby weakening the torque applied by the busbar 30 to the electrode terminal 23, reducing the damage to the electrode terminal 23, and reducing the risk of failure of the electrode terminal 23.

[0161] Please refer to FIG. 5, and further refer to FIG. 6 and FIG. 7, FIG. 6 is a top view of the battery cell provided by some embodiments of the application, and FIG. 7 is an enlarged view of B in FIG. 6, wherein FIG. 6 is a view obtained by projecting the battery cell from the outer surface of the first wall to the inner surface of the first wall. According to some embodiments of the application, the battery cell 20 further comprises a second insulating piece 27, the second insulating piece 27 covers at least a part of the outer surface 213a of the first wall; the second insulating piece 27 has a second through hole 271, and the electrode terminal 23 is arranged opposite to the second through hole 271 along the thickness direction Z of the first wall.

[0162] The second insulating piece 27 covers at least a part of the outer surface 213a of the first wall, and the second insulating piece 27 can be bonded with the outer surface 213a of the first wall.

[0163] The second insulating piece 27 can be an insulating patch, and the thickness of the second insulating piece 27 can be relatively thin to occupy a smaller assembly space.

[0164] The material of the second insulating piece 27 can be plastic, rubber, ceramic, mica, etc.

[0165] The second through hole 271 is arranged corresponding to the electrode terminal 23, and the electrode terminal 23 is exposed to the second through hole 271 along the thickness direction Z of the first wall, so as to facilitate the connection of the electrode terminal 23 with the conductor outside the battery cell 20.

[0166] In the above scheme, the second insulating piece 27 is used to realize the insulation isolation of the first wall 213 and the conductor outside the battery cell 20. The electrode terminal 23 is arranged opposite to the second through hole 271 along the thickness direction Z of the first wall, so as to facilitate the connection of the electrode terminal 23 with the conductor outside the battery cell 20.

[0167] According to some embodiments of the application, the second insulating piece 27 is connected with the first insulating piece 26.

[0168] The connection mode of the second insulating piece 27 and the first insulating piece 26 can be various, for example, the second insulating piece 27 is bonded with the first insulating piece 26, or is connected by hot melting, etc.

[0169] In some embodiments, the material of the second insulating piece 27 can be the same as or different from the material of the first insulating piece 26. Optionally, the material of the second insulating piece 27 is the same as the material of the first insulating piece 26.

[0170] In the above scheme, the second insulating piece 27 is connected with the first insulating piece 26, so as to facilitate the cooperation of the second insulating piece 27 and the first insulating piece 26 to form the insulation isolation of the connecting piece 25 and the first wall 213 and the electrode terminal 23 and other conductors outside.

[0171] Referring to FIG. 7, according to some embodiments of the present application, the projection of the second insulation member 27 has an overlapping area 272 with the projection of the first insulation member 26 along the thickness direction Z of the first wall.

[0172] The "the projection of the second insulation member 27 has an overlapping area 272 with the projection of the first insulation member 26 along the thickness direction Z of the first wall" means that one end of the first insulation member 26 away from the inside of the battery monomer 20 is connected with the second insulation member 27, and the first insulation member 26 and the second insulation member 27 cooperate to insulate and isolate the electrode terminal 23 and the connecting member 25.

[0173] In some embodiments, the overlapping area 272 is an annular area around the center line of the electrode terminal 23.

[0174] The overlapping area 272 is arranged around the electrode terminal 23, which can have a good insulation effect on the electrode terminal 23 in the circumferential direction of the electrode terminal 23, and meanwhile, the first insulation member 26 and the second insulation member 27 cooperate to insulate and isolate the connecting member 25 and the first wall 213.

[0175] In the above scheme, the overlapping area 272 is an annular area around the center line of the electrode terminal 23, and the second insulation member 27 and the first insulation member 26 have a good insulation effect.

[0176] Referring to FIG. 8 and FIG. 9, FIG. 8 is a schematic diagram of part of the structure of a battery according to some embodiments of the present application, and FIG. 9 is a sectional view of part of the structure of the battery according to some embodiments of the present application. According to some embodiments of the present application, the present application further provides a battery 100, which comprises a plurality of battery monomers 20 as provided in any of the above embodiments and a current collecting member 30.

[0177] The current collecting member 30 is a conductive member, and the current collecting member 30 can be a metal member, for example, the material of the current collecting member 30 can be aluminum, copper, nickel or alloy, etc.

[0178] The current collecting member 30 is welded to the first end surface 231 of the electrode terminal 23, so as to firmly connect the current collecting member 30 with the electrode terminal 23.

[0179] According to the battery 100 of the embodiments of the present application, the current collecting member 30 is used to electrically connect the adjacent two battery monomers 20, which facilitates the transmission of electric energy.

[0180] Please refer to FIG. 10, which is an enlarged view of part C of FIG. 9. According to some embodiments of the present application, the current-collecting member 30 includes a second body portion 31 having a first surface 311 facing the first wall 213 and a second surface 312 facing away from the first wall 213, and a second protruding portion 32 protruding from the first surface 311; the electrode terminal 23 has a first end surface 231 facing away from the inside of the battery cell 20, and the second protruding portion 32 is connected to the first end surface 231.

[0181] The second body portion 31 can be a base body of the current-collecting member 30, and the thickness direction of the second body portion 31 is parallel to the thickness direction of the current-collecting member 30.

[0182] In some embodiments, the thickness direction of the second body portion 31 is parallel to the thickness direction Z of the first wall.

[0183] The first surface 311 and the second surface 312 are two surfaces of the second body portion 31 oppositely arranged in the thickness direction of the second body portion 31.

[0184] The second protruding portion 32 protrudes from the first surface 311 and is arranged towards the battery cell 20 so as to be connected to the electrode terminal 23, as indicated by the second surface 312 pointing to the first surface 311.

[0185] In the above scheme, the second protruding portion 32 is arranged so as to realize the connection between the current-collecting member 30 and the first end surface 231, facilitating the transmission of electric energy.

[0186] Please refer to FIG. 10. According to some embodiments of the present application, a second recessed portion 33 is formed on the side of the current-collecting member 30 facing away from the first wall 213, and the second recessed portion 33 corresponds in position to the second protruding portion 32.

[0187] The second recessed portion 33 can be a groove formed on the side of the current-collecting member 30 facing away from the first wall 213.

[0188] The second recessed portion 33 and the second protruding portion 32 are arranged in correspondence in the thickness direction of the second body portion 31, and the current-collecting member 30 can be formed by stamping from a plate structure.

[0189] In the above scheme, the second recessed portion 33 corresponds in position to the second protruding portion 32, facilitating processing and manufacturing, for example, the current-collecting member 30 can form the second protruding portion 32 and the second recessed portion 33 by stamping.

[0190] Please refer to FIG. 8 and FIG. 10. According to some embodiments of the present application, the current-collecting member 30 further includes a buffer portion 34, the buffer portion 34 is arranged around the second protruding portion 32, and the buffer portion 34 connects the second body portion 31 and the second protruding portion 32.

[0191] The buffer portion 34 is annular and surrounds the second protrusion 32, and is used to buffer stress inside the busbar member 30. For example, when the busbar member 30 is subjected to a pulling force, the buffer portion 34 can buffer the stress inside the busbar member 30, and reduce the influence on the connection between the second protrusion 32 and the first end surface 231.

[0192] In the above scheme, the buffer portion 34 is arranged to buffer the stress received by the busbar member 30, thereby reducing the pulling force of the busbar member 30 on the electrode terminal 23.

[0193] Please refer to FIG. 8 and FIG. 10. According to some embodiments of the present application, the second body portion 31 is a flat plate structure, and the buffer portion 34 is a bent structure.

[0194] The second body portion 31 is a flat plate structure, and the thickness of the second body portion 31 can be relatively thin, which occupies a smaller assembly space and has a lower cost while meeting the overcurrent capacity.

[0195] The buffer portion 34 can be formed by flat plate stamping, which is convenient for processing and manufacturing.

[0196] In the above scheme, the second body portion 31 is a flat plate structure, and the buffer portion 34 is a bent structure, which can deform to buffer stress when the busbar member 30 is subjected to external force.

[0197] In order to describe the structure of the buffer portion, please refer to FIG. 10, and further refer to FIG. 11 and FIG. 12. FIG. 11 is a partial cross-sectional view of a battery according to some embodiments of the present application, and FIG. 12 is a partial cross-sectional view of a battery according to some other embodiments of the present application.

[0198] According to some embodiments of the present application, as shown in FIG. 11, the buffer portion 34 includes a third protrusion 341, the third protrusion 341 surrounds the second protrusion 32, the third protrusion 341 protrudes from the second surface 312, and the side of the busbar member 30 facing the first wall 213 is formed with a third recess 342 corresponding to the third protrusion 341; and / or, as shown in FIG. 12, the buffer portion 34 includes a fourth protrusion 343, the fourth protrusion 343 surrounds the second protrusion 32, the fourth protrusion 343 protrudes from the first surface 311, and the side of the busbar member 30 away from the first wall 213 is formed with a fourth recess 344 corresponding to the fourth protrusion 343.

[0199] As shown in FIG. 11, the buffer portion 34 includes a third protrusion 341, the third protrusion 341 is annular, the third protrusion 341 surrounds the second protrusion 32, and the third protrusion 341 protrudes from the side away from the battery monomer 20. The third protrusion 341 and the third recess 342 are arranged to buffer the stress received by the busbar member 30.

[0200] As shown in FIG. 12, the buffer portion includes a fourth protrusion 343, which is annular, is disposed around the second protrusion 32, and protrudes toward the battery cell 20. The fourth protrusion 343 and the fourth recess 344 can buffer stress received by the busbar 30.

[0201] As shown in FIG. 10, the buffer portion 34 includes a third protrusion 341 and a fourth protrusion 343. The third protrusion 341 can be disposed around the fourth protrusion 343, and the fourth protrusion 343 can be disposed around the second protrusion 32. Alternatively, the fourth protrusion 343 can be disposed around the third protrusion 341, and the third protrusion 341 can be disposed around the second protrusion 32. When the busbar 30 is formed with the third protrusion 341 and the fourth protrusion 343, the third protrusion 341 and the fourth protrusion 343 form a two-layer buffer structure, which further improves the buffering capacity of the busbar 30.

[0202] In the above embodiments, the busbar 30 is of an integrated structure and can be formed by flat plate stamping.

[0203] Referring to FIG. 10, according to some embodiments of the present application, the battery cell 20 further includes a second insulating member 27, which covers at least a portion of the outer surface 213a of the first wall. In the thickness direction Z of the first wall, the second insulating member 27 is disposed between the first wall 213 and the busbar 30, and the second insulating member 27 is spaced apart from the busbar 30.

[0204] The second insulating member 27 is disposed between the first wall 213 and the busbar 30, and the second insulating member 27 can be bonded to the first wall 213.

[0205] In the thickness direction Z of the first wall, a gap is provided between the second insulating member 27 and the busbar 30, so that the second insulating member 27 is spaced apart from the busbar 30.

[0206] In some embodiments, the second insulating member 27 has a second through hole 271, the diameter of the second through hole 271 is greater than the diameter of the second protrusion 32, and a portion of the second protrusion 32 extends into the second through hole 271.

[0207] For example, the second through hole 271 is disposed corresponding to the electrode terminal 23, and in the thickness direction Z of the first wall, the electrode terminal 23 is exposed to the second through hole 271. A portion of the second protrusion 32 extends into the second through hole 271 to connect with the electrode terminal 23.

[0208] When the busbar 30 is provided with the fourth protrusion 343, the height of the fourth protrusion 343 protruding from the first surface 311 is lower than the height of the second protrusion 32 protruding from the first surface 311, so that the fourth protrusion 343 is spaced apart from the second insulating member 27.

[0209] During the working process of the battery 100, the busbar 30 is prone to moving relative to the battery cell 20 under the action of an external force. The second insulating member 27 is spaced apart from the busbar 30, and during the movement of the busbar 30 relative to the battery cell 20, the friction between the busbar 30 and the second insulating member 27 can be reduced, and the risk of damage to the second insulating member 27 can be reduced.

[0210] In the above scheme, the second insulating member 27 can insulate and separate the first wall 213 and the busbar 30, reduce the risk of positive and negative contact short circuit, and facilitate to improve the reliability of the battery 100. The second insulating member 27 is spaced apart from the busbar 30, which can reduce the damage of the second insulating member 27 when the busbar 30 moves.

[0211] According to some embodiments of the present application, the embodiments of the present application also provide a battery cell 20 or a battery 100 as described in any of the above embodiments, which is used to provide electric energy.

[0212] According to some embodiments of the present application, please refer to FIGS. 3 to 10, the embodiments of the present application provide a battery 100, which includes a busbar 30 and a plurality of battery cells 20. The electrode terminals 23 of two adjacent battery cells 20 are electrically connected through the busbar 30.

[0213] The battery cell 20 is a cuboid, and the plurality of battery cells 20 are stacked along the first direction X.

[0214] The battery cell 20 includes a case 21, an electrode assembly 22, an electrode terminal 23, a connecting member 25, a first insulating member 26, and a second insulating member 27. The case 21 includes a housing 211 having an opening and an end cap 212 closing the opening, and a first wall 213 is the end cap 212. The first wall 213 includes a first body portion 2132 and a first protruding portion 2133 protruding from an inner surface 2132a of the first body portion, and an outer surface 213a of the first wall is formed with a first recessed portion 2131 at a position corresponding to the first protruding portion 2133, and a portion of the electrode terminal 23 is accommodated in the first recessed portion 2131. The electrode terminal 23 is recessed toward an inside of the battery cell 20 with respect to the outer surface 213a of the first wall, and the electrode terminal 23 has a first end surface 231 facing away from the inside of the battery cell 20, and a distance between the first end surface 231 and the outer surface 213a of the first wall in a thickness direction Z of the first wall is greater than 0 and less than or equal to 2 mm. The connecting member 25 is fitted to the electrode terminal 23 and fixes the electrode terminal 23 to the first wall 213. The first insulating member 26 is fitted to an outside of the electrode terminal 23, and the first insulating member 26 is located between the electrode terminal 23 and the connecting member 25. The first insulating member 26 includes a first connecting portion 261 connected to the electrode terminal 23, and a first end surface 231 does not protrude from the first connecting portion 261, and the first connecting portion 261 is directed from the inner surface 2132a of the first body portion toward an outer surface 2132b of the first body portion. The second insulating member 27 covers at least a portion of the outer surface 213a of the first wall. The second insulating member 27 is connected to the first insulating member 26, and a projection of the second insulating member 27 overlaps a projection of the first insulating member 26 in the thickness direction Z of the first wall, and the overlapping region 272 is an annular region around a center line of the electrode terminal 23.

[0215] The second body part 31 has a first surface 311 facing the first wall 213 and a second surface 312 away from the first wall 213, and the second protruding part 32 protrudes from the first surface 311 and is connected to the first end surface 231. The second protruding part 32 is provided with a second recess 33 on the side of the second body part 31 away from the first wall 213, and the second recess 33 is in position correspondence with the second protruding part 32. The second body part 31 further comprises a buffer part 34, which is arranged around the second protruding part 32, and the buffer part 34 is connected to the second body part and the second protruding part 32. The buffer part 34 comprises a third protruding part 341 and a fourth protruding part 343, the fourth protruding part 343 is arranged around the second protruding part 32, and the third protruding part 341 is arranged around the fourth protruding part 343. The third protruding part 341 protrudes from the second surface 312, and the third recess 342 is formed on the side of the second body part 31 facing the first wall 213, and the third recess 342 is in position correspondence with the third protruding part 341. The fourth protruding part 343 protrudes from the first surface 311, and the fourth recess 344 is formed on the side of the second body part 31 away from the first wall 213, and the fourth recess 344 is in position correspondence with the fourth protruding part 343. The second body part 31 is in a flat plate structure, and the current collecting member 30 is integrally formed.

[0216] In the thickness direction Z of the first wall, the second insulating part 27 is arranged between the first wall 213 and the current collecting member 30, and the second insulating part 27 is arranged in a spaced manner with the current collecting member 30.

[0217] According to the battery 100 of the present application, the electrode terminal 23 is arranged towards the inside of the battery cell 20, and in the thickness direction Z of the first wall, the structure after the current collecting member 30 is connected to the electrode terminal 23 occupies a small space, so as to improve the space utilization rate of the inside of the battery 100 in the thickness direction Z of the first wall, and to improve the energy density of the battery 100. The second protruding part 32 of the current collecting member 30 is welded to the first end surface 231 of the electrode terminal 23, and the current collecting member 30 is electrically connected to the electrode terminals 23 of the two battery cells 20. When the current collecting member 30 is subjected to an external force and exerts a torsion force on the electrode terminal 23, since the first insulating part 26 is located between the electrode terminal 23 and the connecting part 25, the first insulating part 26 can weaken the torsion force exerted by the current collecting member 30 on the electrode terminal 23, reduce the damage to the electrode terminal 23, reduce the risk of failure of the electrode terminal 23, and improve the reliability of the battery 100.

[0218] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and equivalent components can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application 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 including a first wall; an electrode assembly disposed in the housing, the electrode assembly including a tab; an electrode terminal disposed on the first wall and electrically connected to the tab; wherein the electrode terminal does not protrude from an outer surface of the first wall.

2. The battery cell of claim 1, wherein, The electrode terminal is recessed relative to the outer surface of the first wall toward an interior of the battery cell.

3. The battery cell of claim 2, wherein, The electrode terminal has a first end surface facing away from the interior of the battery cell, and a distance between the first end surface and the outer surface of the first wall in a thickness direction of the first wall is greater than 0 and less than or equal to 2 mm.

4. The battery cell of any one of claims 1-3, wherein, The outer surface of the first wall is formed with a first recess recessed toward the interior of the battery cell, and a portion of the electrode terminal is accommodated in the first recess.

5. The battery cell of claim 4, wherein, The first wall includes a first body portion and a first protrusion protruding from an inner surface of the first body portion, and the outer surface of the first wall is formed with the first recess at a position corresponding to the first protrusion, and the electrode terminal does not protrude from an outer surface of the first body portion.

6. The battery cell of claim 5, wherein, The first protrusion includes a bottom wall and a peripheral wall surrounding the bottom wall, and the peripheral wall connects the bottom wall and the first body portion, and the bottom wall is provided with a first through hole, and a portion of the electrode terminal is disposed in the first through hole.

7. The battery cell of any one of claims 1-6, wherein, The battery cell further includes a connecting member connected to the first wall, the connecting member is annular, and the connecting member is used to fix the electrode terminal to the first wall.

8. The battery cell of claim 7, wherein, The battery cell further includes a first insulating member connected to the connecting member and the electrode terminal, and the first insulating member is used to separate the connecting member and the electrode terminal.

9. The battery cell of claim 8, wherein, The battery cell further includes a second insulating member covering at least a portion of the outer surface of the first wall. The second insulating member has a second through hole, and the electrode terminal is disposed opposite the second through hole in the thickness direction of the first wall.

10. The battery cell of claim 9, wherein, The second insulating member is connected to the first insulating member.

11. The battery cell of claim 10, wherein, A projection of the second insulating member and a projection of the first insulating member have an overlapping area in the thickness direction of the first wall.

12. The battery cell of claim 11, wherein, The overlapping area is an annular area around a center line of the electrode terminal. 13.A battery including a busbar member and a plurality of battery cells according to any one of claims 1-12, and the electrode terminals of at least two of the battery cells are electrically connected by the busbar member.

14. The battery of claim 13, wherein, The busbar member includes a second body portion and a second protrusion, the second body portion has a first surface facing the first wall and a second surface facing away from the first wall, and the second protrusion protrudes from the first surface; The electrode terminal has a first end surface facing away from the interior of the battery cell, and the second protrusion is connected to the first end surface.

15. The battery of claim 14, wherein, A second recess is formed on a side of the busbar member facing away from the first wall, and the second recess is positionally corresponding to the second protrusion.

16. The battery of claim 14 or 15, wherein, The busbar member further includes a buffer portion, the buffer portion is disposed around the second protrusion, and the buffer portion connects the second body portion and the second protrusion.

17. The battery of claim 16, wherein, The second body portion is a flat plate structure, and the buffer portion is a bent structure.

18. The battery of claim 16 or 17, wherein, The buffer portion includes a third protrusion disposed around the second protrusion, the third protrusion protruding from the second surface, the busbar has a third recess formed on a side facing the first wall, the third recess corresponding in position to the third protrusion; and / or, The buffer portion includes a fourth protrusion disposed around the second protrusion, the fourth protrusion protruding from the first surface, the busbar has a fourth recess formed on a side facing away from the first wall, the fourth recess corresponding in position to the fourth protrusion.

19. The battery of any one of claims 14-18, wherein, The battery cell further includes a second insulating member covering at least a portion of an outer surface of the first wall; In a thickness direction of the first wall, the second insulating member is disposed between the first wall and the busbar, and the second insulating member is spaced apart from the busbar.

20. The battery of claim 19, wherein, The second insulating member has a second through hole, a diameter of the second through hole being greater than a diameter of the second protrusion, and a portion of the second protrusion extending into the second through hole.

21. An electric device comprising the battery cell of any one of claims 1-12 or the battery of any one of claims 13-20, the battery cell or the battery being used to provide electric energy.

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