Battery cell, battery, electrical device, and method and equipment for manufacturing battery cell

Abstract

The present application relates to a battery cell, a battery, an electrical device, a manufacturing method and manufacturing equipment for a battery cell, and belongs to the field of battery manufacturing technology. The present application proposes a battery cell, comprising: a shell; an end cap assembly, comprising a cover plate and an electrode terminal; an electrode assembly, comprising a main body and a tab extending from an end of the main body along a first direction, the first direction being perpendicular to a second direction; a current collecting member, comprising a terminal connection portion and a tab connection portion, which are separately arranged and interconnected, at least a portion of the tab connection portion is arranged between the main body and the shell along the first direction, and at least a portion of the terminal connection portion is arranged between the main body and the cover plate along the second direction, the tab connection portion connects the tab and the terminal connection portion, and the tab connection portion is configured such that: the stiffness of the tab connection portion is less than the stiffness of the terminal connection portion, so as to allow the cover plate and the electrode assembly to move relative to each other through deformation of the tab connection portion. The present application also proposes a battery and an electrical device, comprising the above-mentioned battery cell.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and in particular to a battery cell, a battery, an electrical device, a method for manufacturing a battery cell, and manufacturing equipment. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the industry's sustainable development. For electric vehicles, the technological development level of lithium batteries plays a key role.

[0003] With the rapid development of the lithium battery industry, higher requirements are being placed on the assembly accuracy of battery cells. Assembly errors in battery cells during the assembly process can reduce the energy density and safety performance of battery cells. Summary of the Invention

[0004] The present application proposes a battery cell, a battery, an electrical device, a method for manufacturing a battery cell, and a manufacturing device, which have good energy density and safety performance.

[0005] 1. The first aspect of the present application, in an embodiment, provides a battery cell, comprising: a shell having an opening; an end cap assembly comprising a cover plate and an electrode terminal, the cover plate being used to cover the opening, the electrode terminal being arranged on the cover plate; an electrode assembly being arranged in the shell, the electrode assembly comprising a main body and a tab extending from an end of the main body along a first direction, the end cap assembly being located on one side of the main body along a second direction, the first direction being perpendicular to the second direction; a current collecting member comprising a terminal connecting portion and a tab connecting portion which are separately arranged and interconnected, at least a portion of the tab connecting portion being arranged between the main body and the shell along the first direction, and at least a portion of the terminal connecting portion being arranged between the main body and the cover plate along the second direction, the tab connecting portion being used to connect the tab and the terminal connecting portion, the tab connecting portion being configured such that: the stiffness of the tab connecting portion is less than the stiffness of the terminal connecting portion, so as to allow the cover plate and the electrode assembly to move relative to each other through deformation of the tab connecting portion.

[0006] In the above-mentioned battery cell, the current collecting component includes a terminal connection part and a tab connection part that are separately arranged and interconnected. The stiffness of the tab connection part is less than that of the terminal connection part. When the electrode assembly is placed in the shell, the tab connection part can be deformed to allow the cover plate and the electrode assembly to move relative to each other, so that the cover plate closes the opening of the shell, thereby reducing the adverse effects caused by assembly errors during the assembly process, and improving the assembly accuracy of the cover plate and the shell, thereby making the battery cell have higher energy density, safety performance and appearance quality.

[0007] According to some embodiments of the present application, the tab connecting portion extends along the second direction and is arranged between the main body and the shell along the first direction, and the terminal connecting portion includes a first part and a second part, the first part is arranged between the cover plate and the main body and is used to connect to the electrode terminal, and the second part extends along the second direction and is arranged between the main body and the shell, and is used to connect to the tab connecting portion.

[0008] The second portion and the tab connection portion both extend along the second direction and are disposed between the main body and the shell. The second portion is connected to the tab connection portion. A portion of the second portion can be deformed to allow the cover plate and the electrode assembly to move relative to each other.

[0009] According to some embodiments of the present application, the second portion is overlapped and connected with the tab connecting portion along a third direction, the third direction is perpendicular to the first direction and the second direction, and the thickness direction of the tab and the thickness direction of the tab connecting portion are both parallel to the third direction.

[0010] The second portion, the tab connection, and the thickness of the tab all extend along the third direction, fully utilizing the space around the tab to accommodate the current collecting component, enabling a compact assembly of the current collecting component and the electrode assembly, thereby improving the energy density of the battery cell. The second portion and the tab connection overlap along the third direction, creating a larger connection area between the tab connection and the tab, and between the tab connection and the second portion, thereby improving the current-carrying capacity of the current collecting component.

[0011] According to some embodiments of the present application, the second portion is located on a side of the tab connecting portion facing away from the tab.

[0012] The second part is connected to the pole tab at both sides of the pole tab connection portion, which not only prevents the end of the second part from being inserted into the pole tab and causing a short circuit inside the battery cell, but also fully utilizes the surface on both sides of the pole tab connection portion, increases the connection area between the pole tab and the second part and the pole tab connection portion, and improves the flow capacity of the current collecting component.

[0013] According to some embodiments of the present application, the tab includes two tab edge portions and a tab main body arranged between the two tab edge portions, the two tab edge portions protrude from the tab main body along the third direction, the two tab edge portions and the tab main body jointly define an accommodating space, and the tab connecting portion is at least partially located in the accommodating space and is connected to the tab main body.

[0014] At least part of the tab connection portion is connected to the tab body inside the tab accommodation space, which can effectively utilize the tab accommodation space and prevent the maximum outer dimensions of the electrode assembly assembled with the current collecting component from increasing, thereby making the battery cell structure compact and having a higher energy density.

[0015] According to some embodiments of the present application, the tab connecting portion includes a first segment, a second segment, and a third segment arranged along the second direction, the first segment is used to connect to the terminal connecting portion, the third segment is used to connect to the tab, the second segment connects the first segment and the third segment, and the tab connecting portion allows the cover plate and the electrode assembly to move relative to each other through the deformation of the second segment.

[0016] The tab connection portion is connected to the terminal connection portion through the first section, the third section is connected to the tab, and the second section can be deformed to allow the cover plate and the electrode assembly to move relative to each other, thereby enabling the cover plate to close the opening of the shell.

[0017] According to some embodiments of the present application, the thickness of the tab connection portion is smaller than the thickness of the terminal connection portion, so that the stiffness of the tab connection portion is smaller than the stiffness of the terminal connection portion.

[0018] According to some embodiments of the present application, the hardness of the tab connection portion is smaller than the hardness of the terminal connection portion, so that the stiffness of the tab connection portion is smaller than the stiffness of the terminal connection portion.

[0019] According to some embodiments of the present application, the tab connection portion is a multi-layer structure and includes a plurality of stacked conductive sheets, and the terminal connection portion is a single-layer structure, so that the stiffness of the tab connection portion is less than that of the terminal connection portion.

[0020] According to some embodiments of the present application, each layer of the multi-layer conductive sheet has the same thickness.

[0021] The thickness of each layer of the multi-layer conductive sheet is equal, which can ensure uniform current flow at the tab connection part, and the stiffness of each layer of the conductive sheet is the same, so the single-layer conductive sheet is not easy to break when the tab connection part is deformed.

[0022] According to some embodiments of the present application, two adjacent layers of conductive sheets in the multi-layer conductive sheet are welded or connected by conductive glue.

[0023] The above-mentioned structural form can connect two adjacent layers of conductive sheets, thereby improving the current carrying capacity of the tab connection portion.

[0024] A second embodiment of the present application provides a battery, comprising a battery cell according to the first embodiment of the present application.

[0025] The third embodiment of the present application provides an electrical device, including the battery of the second embodiment of the present application.

[0026] A fourth embodiment of the present application provides a method for manufacturing a battery cell, comprising:

[0027] providing a housing having an opening;

[0028] Providing an end cap assembly, the end cap assembly comprising a cover plate and an electrode terminal, the cover plate being used to cover the opening, and the electrode terminal being disposed on the cover plate;

[0029] Providing an electrode assembly, the electrode assembly comprising a main body and a tab extending from an end of the main body along a first direction, the end cap assembly being located on one side of the main body along a second direction, the first direction being perpendicular to the second direction;

[0030] A current collecting member is provided, the current collecting member including a terminal connecting portion and a tab connecting portion that are separately provided and connected to each other, at least a portion of the tab connecting portion is provided between the main body and the housing along a first direction, and at least a portion of the terminal connecting portion is provided between the main body and the cover plate along a second direction, the tab connecting portion is used to connect the tab and the terminal connecting portion, and the tab connecting portion is configured such that: the stiffness of the tab connecting portion is less than the stiffness of the terminal connecting portion, so that the deformation of the tab connecting portion allows the cover plate and the electrode assembly to move relative to each other;

[0031] The electrode tab and the electrode terminal are connected through the current collecting member, the electrode assembly is placed inside the shell, and the opening is closed with the cover plate.

[0032] A fifth embodiment of the present application provides a battery cell manufacturing device, comprising:

[0033] A first providing device is used to provide a housing, wherein the housing has an opening;

[0034] A second providing device is configured to provide an end cap assembly, wherein the end cap assembly includes a cover plate and an electrode terminal, wherein the cover plate is configured to cover the opening, and the electrode terminal is disposed on the cover plate;

[0035] A third providing device is configured to provide an electrode assembly, the electrode assembly comprising a main body and a tab extending from an end portion of the main body along a first direction, the end cap assembly being located on one side of the main body along a second direction, the first direction being perpendicular to the second direction;

[0036] A fourth providing device is configured to provide a current collecting member, the current collecting member comprising a terminal connecting portion and a tab connecting portion that are separately provided and connected to each other, at least a portion of the tab connecting portion being disposed between the main body and the housing along a first direction, and at least a portion of the terminal connecting portion being disposed between the main body and the cover plate along a second direction, the tab connecting portion being configured to connect the tab and the terminal connecting portion, the tab connecting portion being configured such that: the stiffness of the tab connecting portion is less than the stiffness of the terminal connecting portion, so that deformation of the tab connecting portion allows relative movement between the cover plate and the electrode assembly;

[0037] An installation module is used to connect the electrode tab and the electrode terminal through the current collecting member, place the electrode assembly inside the shell, and then use the cover plate to close the opening.

[0038] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 Shown is a simplified schematic diagram of a vehicle in some embodiments of the present application;

[0041] Figure 2 Shown is Figure 1 A schematic diagram of the structure of the battery of the vehicle;

[0042] Figure 3 Shown is Figure 2 Axonometric view of a battery cell in the battery;

[0043] Figure 4 The diagram shows a schematic structural diagram of a front view of an assembly formed by assembling an electrode assembly, a cover plate, and a current collecting member of a battery cell according to some embodiments of the present application;

[0044] Figure 5 The figure shows a schematic side view of a structure of an assembly formed by assembling an electrode assembly, a cover plate, and a current collecting member of a battery cell in some embodiments of the present application;

[0045] Figure 6 Shown is an axonometric view of a current collecting component in some embodiments of the present application;

[0046] Figure 7 Shown is a schematic structural diagram of an electrode assembly of a battery cell in some embodiments of the present application;

[0047] Figure 8 Shown are schematic side-view structural diagrams of current collecting components in other embodiments of the present application;

[0048] In the above drawings, the drawings are not drawn according to the actual scale.

[0049] Icons: 1000-Vehicle; 100-Battery; 10-Battery Cell; 11-Casing; 111-Opening Edge; 12-End Cap Assembly; 121-Cover; 1211-Cover Edge; 122-Electrode Terminal; 123-Pressure Relief; 13-Electrode Assembly; 131-Main Body; 132-Electrode Tab; 1321-Electrode Tab Main Body; 1322-Electrode Tab Edge; 1323-Accommodation Space; 14-Current Collecting Component; 141-Terminal Connector Connecting part; 1411-first part; 1412-second part; 1413-terminal through hole; 1414-positioning hole; 142-ear connecting part; 1421-first section; 1422-second section; 1423-third section; 1424-first surface; 1425-second surface; 1426-conductive sheet; 15-insulating part; 20-housing; 21-first housing; 22-second housing; 200-controller; 300-motor. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0052] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0053] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," "connected," and "attached" are to be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0054] The term "plurality" used in this application refers to two or more (including two).

[0055] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells.

[0056] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing for enclosing one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0057] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, and the uncoated positive electrode collector serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, and the uncoated negative electrode collector serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, among others. To ensure that high currents can pass without fusing, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be a wound or laminated structure, but the embodiments of the present application are not limited thereto.

[0058] The battery cell also includes a pressure relief portion, which is activated when the internal pressure of the battery cell reaches a threshold value. The threshold design varies according to different design requirements. The threshold value may depend on the material of one or more of the positive electrode plate, negative electrode plate, electrolyte and separator of the battery cell. The pressure relief portion can take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell reaches a threshold value, the pressure relief portion performs an action or the weak structure provided in the pressure relief portion is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0059] The "activation" mentioned in this application refers to the action of the pressure relief part or its activation to a certain form, so that the internal pressure and temperature of the battery cell can be released. The action of the pressure relief part may include but is not limited to: at least a part of the pressure relief part is broken, shattered, torn or opened, etc. When the pressure relief part is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the open part as emissions. In this way, the pressure and temperature of the battery cell can be released under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0060] The battery cell also includes a current collecting component, which is used to electrically connect the tabs and electrode terminals of the battery cell to transmit electrical energy from the electrode assembly to the electrode terminals, and then to the outside of the battery cell through the electrode terminals; multiple battery cells are electrically connected through the current collecting component to realize series, parallel or mixed connection of multiple battery cells.

[0061] The inventors discovered that the assembly error of the battery cell is mainly reflected in the assembly error between the cover plate and the shell. There are many factors that lead to the assembly error between the cover plate and the shell, among which the assembly error of the assembly formed by the electrode assembly, the cover plate and the current collecting component is the main factor leading to the assembly error between the cover plate and the shell. After the electrode assembly is placed inside the shell, there may be a positional deviation between the cover plate and the electrode assembly, which will cause the cover plate to fail to completely close the opening of the shell. This not only leads to poor sealing between the cover plate and the shell, reducing the safety performance of the battery cell, but also increases the external dimensions of the battery cell and reduces the energy density of the battery cell. If the cover plate and the shell are forcibly assembled, the connection between the current collecting component and the pole lug will be deformed, and the end of the current collecting component may be inserted into the pole piece, which will cause a short circuit inside the battery cell.

[0062] Based on the above ideas, the inventors of this application proposed a technical solution to improve the current collecting component in the assembly formed by the electrode assembly, the cover plate and the current collecting component. Part of the structure of the current collecting component can be deformed to allow the cover plate to move relative to the electrode assembly, so that the cover plate and the shell are well assembled, which can reduce the assembly error of the battery cell, thereby making the battery cell have higher safety performance, energy density and appearance quality.

[0063] It is understandable that the battery cells described in the embodiments of the present application can directly power electrical devices, or can be connected in parallel or in series to form a battery to power various electrical devices in the form of a battery.

[0064] It can be understood that the electrical devices using battery cells or batteries described in the embodiments of the present application can be in various forms, for example, mobile phones, portable devices, laptops, electric vehicles, electric vehicles, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0065] The battery cells and batteries described in the embodiments of the present application are not limited to the electrical devices described above, but can also be applied to all electrical devices using battery cells and batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0066] Figure 1 Shown is a simplified schematic diagram of a vehicle in some embodiments of the present application;.

[0067] like Figure 1 As shown, a battery 100, a controller 200, and a motor 300 are provided inside the vehicle 1000. For example, the battery 100 can be provided at the bottom, front, or rear of the vehicle 1000. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle.

[0068] In some embodiments of the present application, the battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements of the vehicle 1000 during starting, navigation, and driving.

[0069] In other embodiments, the battery 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0070] The battery 100 mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. Figure 2 Shown is Figure 1 Schematic diagram of the structure of the vehicle's battery.

[0071] like Figure 2As shown, the battery 100 includes a plurality of battery cells 10 and a housing 20, wherein the plurality of battery cells 10 are placed in the housing 20. The housing 20 includes a first housing 21 and a second housing 22, which cover each other to form a battery cavity, wherein the plurality of battery cells 10 are placed in the battery cavity. The shapes of the first housing 21 and the second housing 22 can be determined according to the shapes of the plurality of battery cells 10, and the first housing 21 and the second housing 22 can each have an opening. For example, the first housing 21 and the second housing 22 can both be hollow rectangular parallelepipeds with only one open face each, the openings of the first housing 21 and the second housing 22 are arranged opposite to each other, and the first housing 21 and the second housing 22 are interlocked to form a housing 20 with a closed chamber. The plurality of battery cells 10 are connected in parallel, in series, or in a mixed combination and are placed in the housing 20 formed by the interlocking of the first housing 21 and the second housing 22.

[0072] In the battery 100, there can be one or more battery cells 10. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. Multiple battery cells 10 can be connected in series, parallel, or in a hybrid connection to form a battery module, which is then connected in series, parallel, or in a hybrid connection to form a whole and housed within the housing 20. Alternatively, all battery cells 10 can be directly connected in series, parallel, or in a hybrid connection, and then the whole battery module 10 can be housed within the housing 20.

[0073] In some embodiments, the battery 100 may further include a busbar component, and the multiple battery cells 10 may be electrically connected via the busbar component to achieve series connection, parallel connection, or hybrid connection of the multiple battery cells 10 .

[0074] The busbar component may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0075] Figure 3 Shown is Figure 2 Axonometric view of a battery cell in a medium-sized battery.

[0076] like Figure 3 As shown, the battery cell 10 includes a housing 11 , an end cap assembly 12 , an electrode assembly 13 , a current collecting member 14 , and an insulating member 15 .

[0077] The housing 11 can be hexahedral or have other shapes, and a cavity is formed inside the housing 11 for accommodating the electrode assembly 13 and the electrolyte. One end of the housing 11 has an opening so that the electrode assembly 13 can be placed inside the housing 11 through the opening. The housing 11 can be made of a metal material, such as aluminum, an aluminum alloy, or nickel-plated steel.

[0078] like Figure 3As shown, in some embodiments of the present application, the shell 11 is hexahedral, its length direction extends along the first direction X, its height direction extends along the second direction Z, and its thickness direction extends along the third direction Y, and the shell 11 is provided with an opening on one side along the second direction Z.

[0079] In other embodiments, the housing 11 may also be a cylinder or an elliptical cylinder.

[0080] In some embodiments of the present application, the first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0081] In other embodiments, the first direction and the second direction Z are perpendicular to each other, and the third direction Y is not necessarily perpendicular to the first direction X and the second direction Z. For example, the third direction Y is perpendicular to the second direction Z and is inclined relative to the first direction X. For another example, the third direction Y is parallel to the first direction X.

[0082] Figure 4 Shown is a schematic structural diagram from a front view of an assembly formed by assembling an electrode assembly, a cover plate, and a current collecting member of a battery cell in some embodiments of the present application.

[0083] like Figure 3 and Figure 4 As shown, the end cap assembly 12 is located on one side of the main body 131 along the second direction Z. The end cap assembly 12 includes a cover plate 121 , two electrode terminals 122 and a pressure relief portion 123 .

[0084] The cover plate 121 covers the opening of the housing 11, with the cover plate edge 1211 circumferentially abutting the opening edge 111 to enclose the electrode assembly 13 within the housing 11. The cover plate 121 is made of a metal material such as aluminum or steel. The pressure relief portion 123 is activated when the internal pressure of the battery cell 10 reaches a threshold, allowing the internal pressure and temperature of the battery cell 10 to be released.

[0085] The cover plate 121 is provided with two electrode lead-out holes, and two electrode terminals 122 are provided in the two electrode lead-out holes of the cover plate 121. Of the two electrode terminals 122, one is a positive electrode terminal and the other is a negative electrode terminal.

[0086] In some embodiments of the present application, the cover plate 121 is flat, and its size and shape match the opening of the housing 11. The cover plate edge 1211 of the cover plate 121 circumferentially abuts against the opening edge 111 of the housing 11, so that the cover plate 121 is fixed to the opening of the housing 11, thereby enclosing the electrode assembly 13 and the electrolyte in the accommodating cavity of the housing 11.

[0087] like Figure 3 and Figure 4As shown, for example, the cover plate 121 extends in a length direction along a first direction X, in a width direction along a third direction Y, and in a thickness direction along a second direction Z. The pressure relief portion 123 is centrally disposed on the cover plate 121 and extends through the cover plate 121 along the second direction Z. The two electrode terminals 122 are respectively disposed on either side of the pressure relief portion 123 along the first direction X.

[0088] In other embodiments, depending on the shape of the battery cell 10 , the cover plate 121 may also be in other shapes, such as a circle or an ellipse, and the electrode terminals 122 and the pressure relief portion 123 may also be arranged in other ways.

[0089] like Figure 3 and Figure 4 As shown, the electrode assembly 13 is disposed inside the housing 11. The electrode assembly 13 includes a main body 131 and two polarity tabs 132. Each tab 132 extends from the end of the main body 131 along the first direction X. The main body 131 includes a positive electrode sheet, a negative electrode sheet, and a separator. The separator is located between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet from the negative electrode sheet. Of the two tabs 132, one is a positive electrode tab and the other is a negative electrode tab. The positive electrode terminal 122 is electrically connected to the positive electrode tab of the electrode assembly 13 via a current collecting member 14, and the negative electrode terminal 122 is electrically connected to the negative electrode tab of the electrode assembly 13 via another current collecting member 14.

[0090] In some embodiments of the present application, the electrode assembly 13 may be a wound structure with a winding axis parallel to the first direction X.

[0091] In other embodiments, the electrode assembly 13 may also be a laminated structure stacked along the third direction Y.

[0092] In some embodiments of the present application, the thickness direction of the tab 132 is parallel to the third direction Y.

[0093] In other embodiments, the thickness direction of the tab 132 may also be arranged along other directions. For example, the thickness direction of the tab 132 is parallel to the first direction X.

[0094] The insulating member 15 includes terminal protrusions connected to the electrode lead-out holes and positioning protrusions connected to the current collecting member 14. The terminal protrusions are inserted into the electrode lead-out holes, and the electrode terminals 122 are insulated and extend through the terminal protrusions along the Z direction. They connect to the current collecting component outside the battery cell 10 and to the current collecting member 14 inside the battery cell 10. The insulating member 15 also insulates and separates the cover plate 121 from the current collecting member 14 in the Z direction to prevent conductive connection between the electrode assembly 13 and the cover plate 121.

[0095] like Figure 3 and Figure 4As shown, two tabs 132 are oppositely arranged at two ends of the main body 131 of the electrode assembly 13 along the first direction X, and each tab 132 is connected to an electrode terminal 122 of the same polarity through a current collecting member 14 .

[0096] The following takes one group of electrode tabs 132 , electrode assembly 13 and current collecting member 14 as an example to specifically describe the specific structure of the current collecting member 14 and its connection with the electrode tab 132 and electrode terminal 122 .

[0097] like Figure 3 and Figure 4 As shown, the current collecting member 14 includes a terminal connection portion 141 and a tab connection portion 142, which are separately provided and interconnected. At least a portion of the tab connection portion 142 is disposed between the main body 131 and the housing 11 along a first direction X, and at least a portion of the terminal connection portion 141 is disposed between the main body 131 and the cover plate 121 along a second direction Z. The tab connection portion 142 is used to connect the tab 132 and the terminal connection portion 141. The tab connection portion 142 is configured such that its rigidity is less than that of the terminal connection portion 141, so that deformation of the tab connection portion 142 allows relative movement between the cover plate 121 and the electrode assembly 13.

[0098] In the above solution, because the rigidity of the tab connection portion 142 of the current collecting member 14 is less than that of the terminal connection portion 141, the tab connection portion 142 can deform when the electrode assembly 13 is placed in the housing 11, allowing relative movement between the cover plate 121 and the electrode assembly 13. This allows the cover plate edge 1211 to circumferentially abut against the opening edge 111 of the housing 11, allowing the cover plate 121 to seal the opening of the housing 11. Due to the characteristics of the current collecting member 14, when assembled with the battery cell 10, the adverse effects caused by assembly errors can be reduced, and the assembly accuracy of the cover plate 121 and the housing 11 can be improved, thereby ensuring that the battery cell 10 has higher energy density, safety performance, and appearance quality.

[0099] In some embodiments of the present application, the "stiffness" of the terminal connection portion 141 and the tab connection portion 142 can be understood as the force required for a component to undergo unit displacement, or the amount of displacement of the component when a unit force is applied to the component. Because the stiffness of the tab connection portion 142 is less than that of the terminal connection portion 141, when the same force is applied, the degree of deformation of the tab connection portion 142 is greater than that of the terminal connection portion 141.

[0100] In some embodiments of the present application, "the terminal connection part 141 and the tab connection part 142 are separately arranged and connected to each other" can be understood as welding the separately provided terminal connection part 141 and the tab connection part 142 together; it can also be understood as connecting the separately provided terminal connection part 141 and the tab connection part 142 through a connecting part, which can be a threaded part or a rivet, etc.; it can also be understood as bonding the separately provided terminal connection part 141 and the tab connection part 142 using conductive glue.

[0101] In the above solution, the tab connection portion 142 and the tab 132 can be matched in various embodiments; the terminal connection portion 141 and the tab 132 can be arranged on the same side of the tab connection portion 142, or on both sides of the tab connection portion 142; the embodiment for achieving the stiffness of the tab connection portion 142 being less than the stiffness of the terminal connection portion 141 can be that the tab connection portion 142 has a multi-layer structure, the cross-sectional area of ​​the tab connection portion 142 is smaller than the cross-sectional area of ​​the terminal connection portion 141, or the hardness of the tab connection portion 142 is smaller than the hardness of the terminal connection portion 141. Specific embodiments will be further elaborated below.

[0102] Figure 5 1. A schematic diagram of a side view of a structure of an assembly formed by assembling an electrode assembly, a cover plate, and a current collecting member of a battery cell 10 in some embodiments of the present application is shown; Figure 6 Shown is an axonometric view of a current collecting component in some embodiments of the present application.

[0103] like Figure 4 and Figure 5 As shown, the terminal connection portion 141 includes a first portion 1411 and a second portion 1412. The first portion 1411 is provided between the cover plate 121 and the main body 131 and is used to connect to the electrode terminal 122. The first portion 1411 extends along the first direction X, and its thickness direction is parallel to the second direction Z. The second portion 1412 extends along the second direction Z and is provided along the first direction X between the main body 131 and the housing 11 (see FIG. Figure 3 ), one end of the second part 1412 along the second direction Z is connected to the first part 1411.

[0104] In the terminal connection portion 141 of the above-described structural form, the first portion 1411 is connected to the electrode terminal 122, and the second portion 1412 is connected to the tab connection portion 142. During assembly, the first portion 1411 can be connected to the electrode terminal 122 first, and the tab connection portion 142 can be connected to the tab 132 of the electrode assembly 13. Then, the cap plate 121 equipped with the terminal connection portion 141 and the electrode assembly 13 equipped with the tab connection portion 142, which are provided separately, can be connected to the tab connection portion 142 via the second portion 1412 to form a combined body. This not only facilitates assembly but also improves assembly efficiency.

[0105] In the above solution, the first portion 1411 may be completely disposed between the cover plate 121 and the main body 131 , or may be partially disposed between the cover plate 121 and the main body 131 .

[0106] In some embodiments of the present application, the first portion 1411 is completely disposed between the cover plate 121 and the main body 131, and the second portion 1412 extending along the second direction Z is connected to the first portion 1411 between the cover plate 121 and the main body 131. This structural form can simplify the structure of the current collecting member 14 and reduce manufacturing costs.

[0107] In other embodiments, a portion of the first portion 1411 is disposed between the cover plate 121 and the body 131, and another portion is disposed between the cover plate 121 and the tab 132. The second portion 1412 extending along the second direction Z is connected to the first portion 1411 between the cover plate 121 and the tab 132. With this structural form, the terminal connecting portion 141 and the tab connecting portion 142 are connected using the gap between the tab 132 and the housing 11, which can reduce the possibility of the current collecting member 14 squeezing the electrode assembly 13, causing the electrode assembly 13 to deviate in position.

[0108] like Figure 5 and Figure 6 As shown, the terminal connection portion 141 is provided with a terminal through-hole 1413 and a positioning hole 1414 along its thickness. The terminal through-hole 1413 is used to allow the electrode terminal 122 to pass through. The ends of the electrode terminal 122 are riveted in the second direction Z to securely connect the cover plate 121 and the first portion 1411. The positioning hole 1414 is used to engage with the positioning protrusion of the insulating member 15 to determine the relative position of the first portion 1411 and the insulating member 15.

[0109] like Figure 5 and Figure 6 As shown, the tab connection portion 142 extends along the second direction Z and is provided along the first direction X between the main body 131 and the housing 11 (see Figure 3), the tab connecting portion 142 includes a first segment 1421, a second segment 1422, and a third segment 1423 arranged along the second direction Z. The first segment 1421 is used to connect to the other end of the second portion 1412 along the second direction Z, the third segment 1423 is used to connect to the tab 132, and the second segment 1422 connects the first segment 1421 and the third segment 1423.

[0110] It is understood that "the second portion 1412 extends along the second direction Z" means that the length direction of the second portion 1412 is approximately parallel to the second direction Z. For example, the second portion 1412 may extend along a straight line parallel to the second direction Z; for another example, the second portion 1412 may extend along an arc or curve extending approximately along the second direction Z. The thickness and width directions of the second portion 1412 extend approximately perpendicular to the second direction Z. For example, the thickness direction of the second portion 1412 extends along the third direction Y, and the width direction extends along the first direction X; for another example, the thickness and width directions of the second portion 1412 vary in different portions extending along the second direction Z; for another example, the thickness and width directions of the second portion 1412 extend along other directions that are inclined to the second direction Z, and the specific details are not limited thereto.

[0111] After the electrode assembly 13 is placed inside the shell 11, when there is a position deviation between the cover plate 121 and the shell 11, the pole ear connection portion 142 allows the cover plate 121 and the electrode assembly 13 to move relative to each other through the deformation of the second section 1422, thereby making the cover plate edge 1211 circumferentially abut against the opening edge 111 of the shell 11, so that the cover plate 121 closes the opening of the shell 11.

[0112] It is understood that the cover plate 121 can move relative to the electrode assembly 13 in a single direction or in multiple directions, depending on the positional deviation between the cover plate 121 and the housing 11. Correspondingly, the deformation direction of the second section 1422 can also be along a single direction or in multiple directions.

[0113] For example, when there is a position deviation between the cover edge 1211 of the cover 121 and the opening edge 111 of the shell 11 in the second direction Z, the second section 1422 is deformed along the second direction Z; when there is a position deviation between the cover edge 1211 of the cover 121 and the opening edge 111 of the shell 11 in the third direction Y, the second section 1422 is deformed along the third direction Y.

[0114] For another example, when there is a position deviation between the cover edge 1211 of the cover 121 and the opening edge 111 of the shell 11 in both the second direction Z and the third direction Y, the second section 1422 is deformed in both the second direction Z and the third direction Y.

[0115] In the above solution, the thickness direction of the tab 132 is parallel to the third direction Y, and the thickness directions of the tab connecting portion 142 and the tab 132 can be arranged in the same direction or in different directions.

[0116] like Figure 5 and Figure 6 As shown, in some embodiments of the present application, the thickness direction of the tab connection portion 142 is the same as the thickness direction of the tab 132 and both are parallel to the third direction Y, so that the tab connection portion 142 and the tab 132 have a larger connection area, thereby improving the current flow capacity of the tab connection portion 142, and can also assemble the tab 132 and the tab connection portion 142 in a compact manner as much as possible, thereby improving the energy density of the battery cell 10.

[0117] In other embodiments, the thickness direction of the tab connection portion 142 may be different from the thickness direction of the tab 132. For example, the thickness direction of the tab 132 is parallel to the third direction Y, and the thickness direction of the tab connection portion 142 is parallel to the first direction X.

[0118] Based on the above structure, the thickness directions of the first section 1421 of the tab connecting portion 142 and the second portion 1412 of the terminal connecting portion 141 may be arranged in the same direction or in different directions.

[0119] In some embodiments of the present application, the thickness direction of the second portion 1412 of the terminal connection portion 141 is parallel to the third direction Y, and the second portion 1412 and the first section 1421 are overlapped and connected along the third direction Y.

[0120] Through the above-mentioned structural form, the thickness directions of the second part 1412, the pole tab connection portion 142 and the pole tab 132 all extend along the third direction Y, and the second part 1412 and the first section 1421 are overlapped along the third direction, so that the pole tab connection portion 142 and the pole tab 132, and the pole tab connection portion 142 and the second part 1412 have a larger connection area, so that the current collecting component 14 has better current flow capacity.

[0121] In other embodiments of the present application, the thickness directions of the second part 1412 and the first section 1421 are parallel to the third direction Y, and the second part 1412 and the first section 1421 are connected by two ends close to each other along the second direction Z, and there is no overlapping area in the third direction Y.

[0122] In other embodiments of the present application, the second portion 1412 and the first section 1421 may have different thickness directions. For example, the second portion 1412 and the first section 1421 are connected by two opposite sides along the first direction X, and have no overlapping area in the third direction Y.

[0123] In the above solution, the terminal connection portion 141 and the tab 132 may be arranged on the same side of the tab connection portion 142 , or may be arranged on both sides of the tab connection portion 142 .

[0124] like Figure 5 and Figure 6 As shown, the two sides of the tab connection portion 142 along its thickness direction (i.e., the third direction Y) are respectively a first surface 1424 and a second surface 1425, wherein the first surface 1424 is the surface close to the tab 132 along the third direction Y, and the second surface 1425 is the surface away from the tab 132 along the third direction Y.

[0125] In some embodiments of the present application, the second portion 1412 is located on the side of the tab connection portion 142 facing away from the tab 132, that is, the second portion 1412 is in contact with the second surface 1425 to achieve the connection between the terminal connection portion 141 and the tab connection portion 142. The first surface 1424 is in contact with the tab body 1321 and is welded to it.

[0126] Through the above-mentioned structural form, not only can the second part 1412 be prevented from being inserted into the pole tab 132 to cause a short circuit inside the battery cell 10, but the surfaces of the pole tab connecting portion 142 on both sides along the third direction Y can also be fully utilized to increase the connection area between the pole tab 132 and the second part 1412 and the pole tab connecting portion 142 respectively, thereby improving the current flow capacity of the current collecting component 14.

[0127] In other embodiments, the second portion 1412 and the tab 132 may also both be in contact with the first surface 1424 of the tab connecting portion 142 .

[0128] In the above scheme, the tab connection portion 142 can protrude from the electrode assembly 13 along the third direction Y, or the excess space between the theoretical maximum rectangular space of the electrode assembly 13 and its actual occupied space can be used to accommodate the tab connection portion 142, so that the electrode assembly 13 and the current collecting component 14 are assembled compactly, the volume of the battery cell 10 is reduced, and the energy density of the battery cell 10 is improved.

[0129] Figure 7 Shown is a schematic structural diagram of an electrode assembly of a battery cell in some embodiments of the present application.

[0130] like Figure 5 、 Figure 6 and Figure 7As shown, in some embodiments of the present application, the tab 132 includes a tab body 1321 and two tab edge portions 1322. The tab body 1321 is disposed between the two tab edge portions 1322. The two tab edge portions 1322 are spaced apart along the second direction Z. Each tab edge portion 1322 protrudes from the tab body 1321 along the third direction Y. The two tab edge portions 1322 and the tab body 1321 jointly define an accommodation space 1323. At least a portion of the tab connection portion 142 is located in the accommodation space 1323 and is connected to the tab body 1321.

[0131] like Figure 5 As shown, in some embodiments of the present application, the tab connection portion 142 is entirely located inside the accommodation space 1323 and is connected to the tab body 1321 inside the accommodation space 1323 .

[0132] Through the above-mentioned structural form, the accommodating space 1323 of the tab 132 can be effectively utilized, so that the maximum outer dimensions of the electrode assembly 13 and the current collecting member 14 will not increase after assembly, nor will the outer dimensions of the battery cell 10 increase. Therefore, the battery cell 10 can be made compact and have a higher energy density.

[0133] In other embodiments, the third section 1423 of the tab connecting portion 142 is connected to the tab body 1321 within the accommodating space 1323, and at least a portion of the first section 1421 is located outside the accommodating space 1323 and connected to the first portion 1411 to avoid the first section 1421 of the tab connecting portion 142 squeezing the tab edge portion 1322, causing the tab 132 to deflect along the third direction Y.

[0134] In the above scheme, there are many ways to achieve that the stiffness of the tab connection part 142 is less than the stiffness of the terminal connection part 141. The tab connection part 142 may be a multi-layer structure, the cross-sectional area of ​​the tab connection part 142 may be smaller than the cross-sectional area of ​​the terminal connection part 141, or the hardness of the tab connection part 142 may be smaller than the hardness of the terminal connection part 141, etc.

[0135] Figure 8 Shown is a schematic structural diagram of a side view of a current collecting component in some embodiments of the present application.

[0136] like Figure 8 As shown, in some embodiments of the present application, the tab connection portion 142 is a multi-layer structure and includes a multi-layer conductive sheet 1426 stacked together, and the terminal connection portion 141 is a single-layer structure.

[0137] The multi-layer conductive sheets 1426 are stacked along the third direction Y, which can significantly reduce the hardness of the tab connection portion 142 . The tab connection portion 142 can be flexibly deformed and is not easily broken, and also has a good current carrying capacity.

[0138] In some embodiments of the present application, the conductive sheet 1426 and the terminal connection portion 141 are made of the same material, such as aluminum, foil, etc.

[0139] In other embodiments, the materials of the conductive sheet 1426 and the terminal connection part 141 can be flexibly selected according to the stiffness requirements and overcurrent capacity requirements of the tab connection part 142 and the terminal connection part 141, and the materials of the conductive sheet 1426 and the terminal connection part 141 can also be different.

[0140] In some embodiments of the present application, the thickness H3 of each layer of conductive sheet 1426 in the multi-layer conductive sheet 1426 is equal, which can ensure uniform flow of current through the tab connection portion 142, and the stiffness of each layer of conductive sheet 1426 is the same, so that the single-layer conductive sheet 1426 is not easy to break when the tab connection portion 142 is deformed.

[0141] In other embodiments, the thickness of each layer of the conductive sheet 1426 may not be limited.

[0142] In the above solution, two adjacent layers of conductive sheets 1426 are connected to improve the current flow capacity of the tab connection portion 142 .

[0143] In some embodiments of the present application, two adjacent layers of conductive sheets 1426 are welded or connected by conductive adhesive, so that the two adjacent layers of conductive sheets 1426 can be connected, thereby improving the current flow capacity of the tab connection portion.

[0144] In other embodiments, two adjacent layers of conductive sheets 1426 may be connected in other ways. For example, a multi-layer structure may be formed by folding a larger conductive sheet multiple times, with one edge of two adjacent layers of conductive sheets 1426 connected in the first direction X, and the other edges connected to two other adjacent layers of conductive sheets 1426. For another example, a multi-layer structure may be formed by winding a larger conductive sheet around an axis extending in the second direction Z.

[0145] In some embodiments of the present application, the hardness of the tab connection portion 142 is less than the hardness of the terminal connection portion 141 , so that the stiffness of the tab connection portion 142 is less than the stiffness of the terminal connection portion 141 .

[0146] For example, the surface of the tab connection portion 142 may be embossed along the thickness direction (ie, the third direction Y) of the tab connection portion 142 to reduce its hardness.

[0147] In some embodiments of the present application, the thickness of the tab connection portion 142 is H2, the thickness of the terminal connection portion 141 is H1, and H2<H1, so that the stiffness of the tab connection portion 142 is less than the stiffness of the terminal connection portion 141.

[0148] In some other embodiments of the present application, the width of the tab connection portion 142 is smaller than the width of the terminal connection portion 141 , so that the stiffness of the tab connection portion 142 is smaller than the stiffness of the terminal connection portion 141 .

[0149] Some embodiments of the present application provide a method for manufacturing a battery cell 10, including:

[0150] Providing a housing 11 having an opening;

[0151] An end cap assembly 12 is provided. The end cap assembly 12 includes a cover plate 121 and an electrode terminal 122. The cover plate 121 is used to cover the opening, and the electrode terminal 122 is disposed on the cover plate 121.

[0152] An electrode assembly 13 is provided. The electrode assembly 13 includes a main body 131 and an electrode tab 132 extending from an end of the main body 131 along a first direction X. The end cap assembly 12 is located on one side of the main body 131 along a second direction Z. The first direction X is perpendicular to the second direction Z.

[0153] A current collecting member 14 is provided. The current collecting member 14 includes a terminal connecting portion 141 and a tab connecting portion 142 that are separately provided and connected to each other. At least a portion of the tab connecting portion 142 is provided between the main body 131 and the housing 11 along a first direction X, and at least a portion of the terminal connecting portion 141 is provided between the main body 131 and the cover plate 121 along a second direction Z. The tab connecting portion 142 is used to connect the tab 132 and the terminal connecting portion 141. The tab connecting portion 142 is configured such that: the rigidity of the tab connecting portion 142 is less than the rigidity of the terminal connecting portion 141, so that deformation of the tab connecting portion 142 allows relative movement between the cover plate 121 and the electrode assembly 13.

[0154] The current collecting member 14 is connected to the electrode tab 132 and the electrode terminal 122 . The electrode assembly 13 is placed inside the housing 11 , and the opening is sealed with the cover plate 121 .

[0155] Some embodiments of the present application provide a manufacturing apparatus for a battery cell 10, including:

[0156] A first providing device is used to provide a housing 11, wherein the housing 11 has an opening;

[0157] The second providing device is used to provide an end cap assembly 12, the end cap assembly 12 includes a cover plate 121 and an electrode terminal 122, the cover plate 121 is used to cover the opening, and the electrode terminal 122 is provided on the cover plate 121;

[0158] A third providing device is used to provide an electrode assembly 13, wherein the electrode assembly 13 includes a main body 131 and an electrode tab 132 extending from an end of the main body 131 along a first direction X, and the end cap assembly 12 is located on one side of the main body 131 along a second direction Z, wherein the first direction X is perpendicular to the second direction Z;

[0159] A fourth providing device is used to provide a current collecting member 14, the current collecting member 14 including a terminal connecting portion 141 and a tab connecting portion 142 that are separately provided and connected to each other, at least a portion of the tab connecting portion 142 is provided between the main body 131 and the housing 11 along the first direction X, and at least a portion of the terminal connecting portion 141 is provided between the main body 131 and the cover plate 121 along the second direction Z, the tab connecting portion 142 is used to connect the tab 132 and the terminal connecting portion 141, and the tab connecting portion 142 is configured such that: the stiffness of the tab connecting portion 142 is less than the stiffness of the terminal connecting portion 141, so that deformation of the tab connecting portion 142 allows relative movement between the cover plate 121 and the electrode assembly 13;

[0160] The mounting module is used to connect the tabs 132 and the electrode terminals 122 through the current collecting member 14 , place the electrode assembly 13 inside the housing 11 , and then close the opening with the cover plate 121 .

[0161] It should be noted that the order of implementing the steps of the above welding method is not specifically limited, and the order of implementing the steps of the above welding method is not the only order of implementation.

[0162] It should be noted that, unless there is any conflict, the features in the embodiments of this application can be combined with each other.

[0163] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein: include: a housing having an opening; an end cap assembly, comprising a cover plate and an electrode terminal, wherein the cover plate is used to cover the opening, and the electrode terminal is disposed on the cover plate; an electrode assembly disposed in the housing, the electrode assembly comprising a main body and a tab extending from an end of the main body along a first direction, the end cap assembly being located on one side of the main body along a second direction, the first direction being perpendicular to the second direction; The current collecting component includes a terminal connecting part and a pole tab connecting part which are separately arranged and connected to each other, at least a part of the pole tab connecting part is arranged between the main body and the shell along a first direction, and at least a part of the terminal connecting part is arranged between the main body and the cover plate along a second direction, the pole tab connecting part is used to connect the pole tab and the terminal connecting part, and the pole tab connecting part is configured as follows: the stiffness of the pole tab connecting part is less than the stiffness of the terminal connecting part, so that the cover plate and the electrode assembly can be allowed to move relative to each other through the deformation of the pole tab connecting part, wherein the pole tab connecting part includes a first section, a second section and a third section arranged along the second direction, the first section is connected to the terminal connecting part, the third section is connected to the pole tab, and the second section connects the first section and the third section, and the pole tab connecting part allows the cover plate and the electrode assembly to move relative to each other through the deformation of the second section.

2. The battery cell according to claim 1, wherein: The tab connection portion extends along the second direction and is arranged between the main body and the shell along the first direction. The terminal connection portion includes a first part and a second part. The first part is arranged between the cover plate and the main body and is used to connect with the electrode terminal. The second part extends along the second direction and is arranged between the main body and the shell, and is used to connect with the tab connection portion.

3. The battery cell according to claim 2, wherein: The second portion is overlapped and connected to the tab connection portion along a third direction, the third direction is perpendicular to the first direction and the second direction, and the thickness direction of the tab and the thickness direction of the tab connection portion are both parallel to the third direction.

4. The battery cell according to claim 3, wherein: The second portion is located on a side of the tab connecting portion away from the tab.

5. The battery cell according to claim 4, wherein: The tab includes two tab edge portions and a tab body arranged between the two tab edge portions, the two tab edge portions protrude from the tab body along the third direction, the two tab edge portions and the tab body jointly define an accommodating space, and the tab connecting portion is at least partially located in the accommodating space and connected to the tab body.

6. The battery cell according to any one of claims 1 to 5, wherein: The thickness of the tab connection portion is smaller than the thickness of the terminal connection portion.

7. The battery cell according to any one of claims 1 to 5, wherein: The hardness of the tab connection portion is smaller than the hardness of the terminal connection portion.

8. The battery cell according to any one of claims 1 to 5, wherein: The tab connection portion is a multi-layer structure and includes a plurality of stacked conductive sheets, and the terminal connection portion is a single-layer structure.

9. The battery cell according to claim 8, wherein: The thickness of each conductive layer in the multi-layer conductive sheet is equal.

10. The battery cell according to claim 8, wherein Two adjacent layers of conductive sheets in the multi-layer conductive sheets are welded or connected by conductive adhesive.

11. A battery, wherein: The battery cell comprises the battery cell according to any one of claims 1 to 10.

12. An electrical device, wherein: Comprising the battery of claim 11.

13. A method for manufacturing a battery cell, wherein: include: providing a housing having an opening; Providing an end cap assembly, the end cap assembly comprising a cover plate and an electrode terminal, the cover plate being used to cover the opening, and the electrode terminal being disposed on the cover plate; Providing an electrode assembly, the electrode assembly comprising a main body and a tab extending from an end of the main body along a first direction, the end cap assembly being located on one side of the main body along a second direction, the first direction being perpendicular to the second direction; A current collecting member is provided, the current collecting member comprising a terminal connecting portion and a tab connecting portion which are separately provided and connected to each other, at least a portion of the tab connecting portion being provided between the main body and the shell along a first direction, and at least a portion of the terminal connecting portion being provided between the main body and the cover plate along a second direction, the tab connecting portion being used to connect the tab and the terminal connecting portion, the tab connecting portion being configured such that: the stiffness of the tab connecting portion is less than the stiffness of the terminal connecting portion, so that the cover plate and the electrode assembly can be allowed to move relative to each other through deformation of the tab connecting portion, wherein the tab connecting portion comprises a first section, a second section and a third section provided along the second direction, the first section being connected to the terminal connecting portion, the third section being connected to the tab, the second section connecting the first section and the third section, and the tab connecting portion allowing the cover plate and the electrode assembly to move relative to each other through deformation of the second section; The electrode tab and the electrode terminal are connected through the current collecting member, the electrode assembly is placed inside the shell, and the opening is closed with the cover plate.

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