Battery cell, battery, and electrical device

Abstract

The present application discloses a battery cell, a battery, and an electrical device, which belong to the technical field of batteries. The battery cell comprises a housing, an electrode terminal, and a fixing member; the housing comprises a first wall, and the first wall is provided with a first through hole. The electrode terminal comprises a main body and a step portion, at least part of the main body is arranged as passing through the first through hole, the step portion and the main body are integrally formed, the step portion protrudes out of a peripheral surface of the main body, and the step portion is located on the outside of the first wall. The fixing member is made of a metal material; the fixing member is provided with a second through hole allowing passage of the main body, and in the thickness direction of the first wall, at least a portion of the fixing member is located between the first wall and the step portion and abuts against the step portion. In the thickness direction of the first wall, the main body has a first end face facing away from the interior of the housing, the fixing member has a second end face facing away from the first wall, and the first end face extends beyond the second end face. The energy density of the battery is improved.

Description

Battery cells, batteries, and electrical equipment Technical Field

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

[0002] Batteries are widely used in electronic devices such as electric vehicles, electric cars, electric airplanes, electric ships, etc.

[0003] How to improve the energy density of batteries is an urgent problem to be solved in battery technology.

[0004] Summary of the Invention

[0005] In view of the above problems, the present application provides a battery cell, a battery, and an electrical device, which can improve the energy density of the battery.

[0006] In a first aspect, the present application provides a battery cell comprising a shell, an electrode terminal, and a fixing member, wherein the shell comprises a first wall, and the first wall is provided with a first through hole. The electrode terminal comprises a main body and a step portion, at least a portion of the main body is passed through the first through hole, the step portion is integrally formed with the main body, the step portion protrudes from the outer peripheral surface of the main body, and the step portion is located on the outside of the first wall. The fixing member is made of metal, and the fixing member is provided with a second through hole for the main body to pass through. In the thickness direction of the first wall, at least a portion of the fixing member is located between the first wall and the step portion and abuts against the step portion. In the thickness direction of the first wall, the main body has a first end face facing away from the interior of the shell, and the fixing member has a second end face facing away from the first wall, and the first end face exceeds the second end face.

[0007] In the technical solution of the embodiment of the present application, the housing includes a first wall, which is provided with a first through-hole. The electrode terminal includes a main body and a stepped portion. At least a portion of the main body is inserted through the first through-hole. The stepped portion is integrally formed with the main body, protruding from the outer peripheral surface of the main body, and located outside the first wall. The fixing member is provided with a second through-hole for the main body to pass through. In the thickness direction of the first wall, at least a portion of the fixing member is located between the first wall and the stepped portion and abuts the stepped portion. In the thickness direction of the first wall, the main body has a first end face facing away from the interior of the housing, and the fixing member has a second end face facing away from the first wall, with the first end face extending beyond the second end face. With this design, in the thickness direction of the first wall, the surface of the battery cell that extends the greatest height beyond the outer surface of the first wall is the first end face. When using electrode terminals of the same specifications, the height of the battery cell extending beyond the first wall can be reduced accordingly, thereby increasing the proportion of the space inside the battery cell housing to the total space of the battery, thereby improving the energy density of the battery.

[0008] In some embodiments, the yield strength of the fixing member is greater than the yield strength of the electrode terminal. This design allows the fixing member to be relatively thin when a stable connection is formed between the step portion and the fixing member, thereby further reducing the height of the electrode terminal protruding from the outer surface of the first wall, further improving the energy density of the battery.

[0009] In some embodiments, the yield strength of the fixing member is σs1, and the yield strength of the electrode terminal is σs2, satisfying the following relationship: 1.1 ≤ σs1 / σs2 ≤ 10. Designing the ratio of the yield strength of the fixing member to the yield strength of the electrode terminal to be within a reasonable range can keep the deformation caused by the assembly force when the electrode terminal and fixing member are connected within a controllable range, thereby reducing the difficulty of assembly, lowering the risk of damage to the electrode terminal, and improving the stability of the connection between the two.

[0010] In some embodiments, 3 ≤ σs1 / σs2 ≤ 5. By designing the yield strength ratio of the fixing member to the yield strength of the electrode terminal within a reasonable range, the deformation caused by the assembly force when the electrode terminal and the fixing member are connected can be kept within a controllable range, further reducing the difficulty of assembly, significantly reducing the risk of damage to the electrode terminal, and further improving the stability of the connection between the two.

[0011] In some embodiments, 205 MPa ≤ σs1 ≤ 250 MPa, and 40 MPa ≤ σs2 ≤ 55 MPa. By designing the yield strength of the fixing member and the yield strength of the electrode terminal within a reasonable range, the plasticity and brittleness of the fixing member and the electrode terminal can be designed within a controllable range, thereby reducing the risk of damage to the fixing member and the electrode terminal during assembly.

[0012] In some embodiments, the height difference between the first end face and the second end face in the thickness direction of the first wall is D, and the thickness of the step portion is t, satisfying the following relationship: 1.1 ≤ D / t ≤ 6. By designing the ratio of the height difference between the first end face and the second end face to the thickness of the step portion in the thickness direction of the first wall to be within a reasonable range, the risk of failure of the connection between the step portion and the fixing member when the battery cell is subjected to external forces can be reduced, thereby improving the stability of the connection between the step portion and the fixing member.

[0013] In some embodiments, 0.5 mm ≤ D ≤ 3 mm, and 0.5 mm ≤ t ≤ 2.5 mm. In the thickness direction of the first wall, the height difference between the first end face and the second end face and the thickness of the step portion are designed to be within a reasonable range, thereby improving the energy density of the battery while ensuring good connection stability between the first and second end faces.

[0014] In some embodiments, the fixing member extends beyond the outer circumference of the stepped portion in the radial direction of the body. This design ensures that the stepped portion will not come into contact with other components of the battery cell after abutting the fixing member. The stability of the connection between the electrode terminal and the fixing member can be controlled by only considering the characteristics of the fixing member and the stepped portion, thus reducing design difficulty.

[0015] In some embodiments, in the radial direction of the main body, the projection of the fixing member and the projection of the step portion at least partially overlap. This design further reduces the height of the step portion beyond the outer surface of the first wall, further improving the energy density of the battery.

[0016] In some embodiments, at least a portion of the step portion is accommodated in the second through hole. By accommodating part of the step portion using the second through hole, there is no need to additionally process space for accommodating the step portion, which reduces the processing flow, saves costs, and improves the structural consistency of the fixing member.

[0017] In some embodiments, the diameter of the second through hole gradually decreases as it approaches the first wall, and the step portion abuts against the wall of the second through hole, so that when the step portion is connected to the fixing member, the reserved matching tolerance range is larger, reducing the difficulty of assembly.

[0018] In some embodiments, the stepped portion has a third end surface facing away from the first wall, and the second end surface extends beyond or is flush with the third end surface in the thickness direction of the first wall. This design means that the stepped portion is completely contained within the fixing member in the thickness direction of the first wall, further improving the energy density of the battery.

[0019] In some embodiments, the step portion protrudes from the outer circumference of the main body in the radial direction by a dimension W1, where 0.1 mm ≤ W1 ≤ 5 mm. Designing the dimension of the step portion protruding from the outer circumference of the main body within a reasonable range helps increase the contact area between the step portion and the fixing member, thereby improving the connection strength between the step portion and the fixing member.

[0020] In some embodiments, the edge of the first end surface is provided with a first groove extending along the circumference of the body, and the stepped portion has a fourth end surface facing away from the first wall, the fourth end surface being coplanar with the bottom surface of the first groove. This design allows the stepped portion to be formed by pressing, and the electrode terminal to be connected to the fixing member by riveting, which reduces assembly cost and difficulty.

[0021] In some embodiments, the distance W2 between the side of the first groove and the outer circumference of the step portion in the radial direction of the main body satisfies the following conditions: 0.5 mm ≤ W2 ≤ 10 mm. Designing the distance between the side of the first groove and the outer circumference of the step portion within a reasonable range can reduce the difficulty of forming the step portion through ramming, thereby reducing assembly difficulty and direct equipment costs.

[0022] In some embodiments, the first groove has a depth of T, which satisfies the following: 0.1 mm ≤ T ≤ 5 mm. Designing the first groove depth within a reasonable range can reduce the difficulty of forming the step portion and the first groove by ramming, thereby reducing assembly difficulty and direct equipment costs.

[0023] In some embodiments, the fixing member is made of steel, and the electrode terminal is made of aluminum or a copper-aluminum composite material. In battery manufacturing, the application process of steel, aluminum, or a copper-aluminum composite material is relatively mature, which can reduce design costs.

[0024] In some embodiments, the battery cell further includes a first insulating member, at least a portion of which is disposed between the fixing member and the first wall. This first insulating member can reduce the risk of short circuits between the positive and negative electrode terminals in the battery. Furthermore, it can position certain components within the battery cell, thereby enhancing the stability of the battery cell assembly.

[0025] In some embodiments, the first insulating member includes a main body and a first extension. The main body is positioned between the fixing member and the first wall. The main body is provided with a third through-hole for the supply terminal to pass through. The first extension is positioned on the periphery of the fixing member and surrounds the edge of the main body. This design allows for pre-positioning and limiting the fixing member in the radial direction of the body, reducing assembly difficulty and improving assembly stability. Furthermore, the fixing member and the first wall are insulated and isolated, improving the overcurrent stability of the electrode terminal.

[0026] In some embodiments, a second groove is provided on the outer surface of the first wall, and the main body is located in the second groove. This design allows the first insulating member to be pre-positioned with the first wall through the second groove when assembled, facilitating assembly of the first insulating member.

[0027] In some embodiments, the end of the first extension extends out of the second groove in the thickness direction of the first wall. This design can further improve the insulation between the fixing member and the first wall.

[0028] In some embodiments, the first insulating member further includes a second extension portion, which is disposed around the third through hole, one end of the second extension portion being connected to the main body portion, and the other end of the second extension portion extending toward the main body portion. This design improves the insulation between the electrode terminal and the first wall.

[0029] In some embodiments, the electrode terminal further includes a stopper protruding from the outer circumference of the main body and located inside the first wall. The stopper is used to restrict movement of the electrode terminal toward the exterior of the housing. This design allows for assembly of the electrode terminal and the housing through a single riveting operation, reducing assembly difficulty.

[0030] In some embodiments, the battery cell further includes a seal, which is at least partially located between the first wall and the limiting portion. This design can improve the sealing inside the housing and improve the operating stability of the battery cell.

[0031] In some embodiments, the battery cell further includes an electrode assembly and an adapter. The electrode assembly is disposed within the housing. The adapter connects the electrode terminal and the electrode assembly. The electrode terminal is provided with a positioning portion for positioning the adapter. This design effectively positions the adapter, allowing the adapter and electrode terminal to be welded in the correct position, thereby reducing the risk of a short circuit within the battery cell due to a cold weld causing the electrical connection between the adapter and the electrode terminal to fail, thereby enhancing the reliability of the battery.

[0032] In some embodiments, the adapter is provided with a positioning mating portion that cooperates with the positioning portion. Providing the positioning mating portion on the adapter that cooperates with the positioning portion can effectively improve the positioning accuracy between the adapter and the electrode terminal, thereby effectively reducing the risk of electrical connection failure between the adapter and the electrode terminal due to cold solder joints, thereby enhancing the reliability of the battery.

[0033] In some embodiments, one of the positioning portion and the positioning and matching portion includes a positioning groove, and the other includes a positioning protrusion. By defining one of the positioning portion and the positioning and matching portion as including a positioning groove and the other as including a positioning protrusion, the adapter and the electrode terminal are positioned and matched with each other through the concave-convex structure, which can effectively improve the positioning accuracy between the adapter and the electrode terminal, thereby effectively reducing the risk of electrical connection failure between the adapter and the electrode terminal due to cold welding, thereby improving the reliability of the battery.

[0034] In some embodiments, along the thickness direction of the first wall, the electrode terminal has a first surface facing the electrode assembly, and a third groove is formed on the first surface. The adapter is welded to the electrode terminal to form a first weld mark, and along the thickness direction of the first wall, the first weld mark does not overlap with the third groove. A third groove is formed on the first surface of the electrode terminal. In order to reduce the risk of overlapping of the welding position and the third groove due to inaccurate positioning of the electrode terminal and the adapter during assembly, so that at least part of the first weld mark falls into the third groove, causing a cold weld between the electrode terminal and the adapter, resulting in failure of the electrical connection between the electrode terminal and the adapter, in the above scheme, by providing a positioning portion on the electrode terminal, the adapter can be effectively positioned so that the adapter and the electrode terminal are welded in the correct posture, thereby reducing the risk of failure of the electrical connection between the adapter and the electrode terminal due to cold welding, and making the battery have higher reliability.

[0035] In some embodiments, the first weld mark is disposed around the third groove. Disposing the first weld mark around the third groove can increase the connection area between the adapter and the electrode terminal, improve the connection stability between the adapter and the electrode terminal, reduce the risk of electrical connection failure, and thus provide a higher reliability of the battery.

[0036] In some embodiments, the housing includes a shell and an end cap. The shell includes a bottom wall and side walls surrounding the bottom wall. One end of the side wall is connected to the bottom wall, and the other end forms an opening. The end cap is used to cover the opening. The first wall is either the end cap or the bottom wall. This design expands the application scenarios of the battery cell.

[0037] In a second aspect, the present application provides a battery comprising the battery cell in the above embodiment.

[0038] In some embodiments, the battery further includes a current collector, which is welded to the electrode terminal to form a second weld mark, with the central axis of the first through-hole passing through the second weld mark. This design allows for direct electrical connection between the electrode terminal and the current collector, thereby improving the overcurrent stability of the battery cell.

[0039] In a third aspect, the present application provides an electrical device, which includes the battery cell of the above embodiment for providing electrical energy. Alternatively, it includes the battery of the above embodiment, and the battery is used to provide electrical energy.

[0040] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0042] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0043] FIG2 is an exploded view of a battery according to some embodiments of the present application;

[0044] FIG3 is an exploded view of a battery cell according to some embodiments of the present application;

[0045] FIG4 is an exploded view of a portion of a battery cell according to some embodiments of the present application;

[0046] FIG5 is a top view of a battery cell according to some embodiments of the present application;

[0047] FIG6 is a cross-sectional view of the partial structure of the battery cell at position AA in FIG5 of the present application;

[0048] FIG7 is a partial enlarged view of point B in FIG6;

[0049] FIG8 is a cross-sectional view of a portion of a battery cell according to some embodiments of the present application;

[0050] FIG9 is a schematic diagram of a partial structure of a battery cell in some embodiments of the present application;

[0051] FIG10 is a schematic diagram of a partial structure of a battery cell in some other embodiments of the present application;

[0052] FIG11 is a schematic diagram of a first wall, an electrode terminal, and a transition piece in some other embodiments of the present application;

[0053] FIG12 is a schematic diagram of the first wall, electrode terminals and adapter in some further embodiments of the present application.

[0054] The accompanying drawings in the specific implementation manner are as follows:

[0055] 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery; 11 - housing; 111 - first part; 112 - second part; 12 - battery cell; 121 - housing; 1211 - end cap; 1212 - housing; 122 - electrode assembly; 123 - electrode terminal; 1231 - main body; 12311 - first end surface; 1232 - step portion; 12321 - third end surface; 1233 - limit portion; 12331 - first surface; 12332 - third groove; 1234 - first groove; 124 - adapter; 1240 - terminal connection portion; 1241 - tab connection portion; 1242 -intermediate connecting portion; 125-fixing member; 1251-second through hole; 1252-second end face; 126-first insulating member; 1261-main body; 12611-third through hole; 1262-first extension portion; 1263-second extension portion; 127-sealing member; 128-first wall; 1281-first through hole; 1282-second groove; 15-positioning portion; 150-positioning protrusion; 16-positioning matching portion; 160-positioning groove; 17-first weld mark. DETAILED DESCRIPTION

[0056] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments 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 figure descriptions are intended to cover non-exclusive inclusions.

[0058] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0059] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present 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 herein may be combined with other embodiments.

[0060] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0061] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0062] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0063] In this application, battery cells may include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. The shape of a battery cell may include, but is not limited to, a cylinder, a flat body, a rectangular parallelepiped, or other shapes. Battery cells, depending on the packaging method, may include, but are not limited to, cylindrical battery cells, prismatic battery cells, and soft-pack battery cells.

[0064] In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cells, battery modules and batteries. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system installed in the electric vehicle. The battery mentioned in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery generally includes a box for encapsulating one or more battery cells. The box can reduce the risk of liquid or other foreign matter affecting the charging or discharging of the battery cells.

[0065] The following description will mainly focus on rectangular parallelepiped battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or soft-pack battery cells in some aspects.

[0066] In a typical battery cell structure, the battery cell includes a housing component, an electrode assembly, and an electrolyte. The housing component can be an end cap or a shell, and the end cap closes an opening of the shell to define a receiving space for receiving the electrode assembly.

[0067] The electrode assembly is housed in the housing. It includes a positive electrode sheet, a negative electrode sheet, and a separator. Battery cells primarily operate 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, serving as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode 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, serving as the negative electrode tab. The negative electrode collector can be made of copper, and the negative electrode active material can be carbon, silicon, or other materials. In order to pass high current without melting, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. In addition, the electrode assembly can be formed in a manner including but not limited to winding or lamination.

[0068] The tabs generally lead out the electrical energy of the electrode assembly by being electrically connected to the conductive member. In some cases, the conductive member is a transition piece connecting the tabs and the electrode terminals. In other cases, the conductive member is the electrode terminal.

[0069] Electrode terminals generally include positive and negative terminals. For rectangular battery cells, electrode terminals are typically located in the end caps. In some other cases, electrode terminals may also be located in the housing. Multiple battery cells can be connected in series and / or in parallel via the electrode terminals for various applications.

[0070] The battery may further include a busbar component, which is used to achieve electrical connection between multiple battery cells, such as parallel connection, series connection, or hybrid connection. The busbar component can achieve electrical connection between battery cells by connecting the electrode terminals of the battery cells.

[0071] The development of battery technology must take into account multiple design factors at the same time, such as reliability, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, the energy density of the battery must also be considered.

[0072] In some cases, the electrode terminals of the battery cells are riveted to the wall of the outer shell by means of rivet blocks that wrap around the ends of the electrode terminals. In the direction of the wall of the outer shell, the surface of the rivet block away from the wall of the outer shell will extend beyond the outer end face of the electrode terminal. This design is to provide additional protection and support for the electrode terminal to reduce the risk of loosening of the electrode terminal. At the same time, the electrical energy of the battery cell can be transferred to the current collection component of the battery through the rivet block. In the above arrangement, the distance between the surface of the rivet block away from the wall of the outer shell and the wall of the battery where the electrode terminal is provided is large, which reduces the proportion of the volume inside the battery cell for storing electrical energy (the volume inside the outer shell) to the total volume of the battery, thereby reducing the energy density of the battery.

[0073] In view of this, the present application provides a battery cell comprising a housing, an electrode terminal, and a fixing member. The housing comprises a first wall, which is provided with a first through-hole. The electrode terminal comprises a main body and a stepped portion. At least a portion of the main body is inserted through the first through-hole. The stepped portion is integrally formed with the main body, protruding from the outer peripheral surface of the main body, and located on the outside of the first wall. The fixing member is provided with a second through-hole for the main body to pass through. In the thickness direction of the first wall, at least a portion of the fixing member is located between the first wall and the stepped portion and abuts the stepped portion. In the thickness direction of the first wall, the main body has a first end face facing away from the interior of the housing, and the fixing member has a second end face facing away from the first wall, with the first end face extending beyond the second end face. The largest surface of the battery cell extending beyond the outer surface of the first wall is the first end face. When using electrode terminals of the same specifications, the height of the battery cell extending beyond the first wall can be reduced accordingly, thereby increasing the proportion of the space inside the battery cell housing to the total space of the battery, thereby increasing the energy density of the battery.

[0074] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, and electrical equipment using batteries.

[0075] Electrical equipment includes, but is not limited to, battery vehicles, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0076] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0077] For example, FIG1 is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A motor 300, a controller 200, and a battery 100 may be provided inside the vehicle 1000. The controller 200 is used to control the battery 100 to power the motor 300. For example, the battery 100 may be provided at the bottom, front, or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as the operating power source of the vehicle 1000 and may be used for the circuit system of the vehicle 1000, such as for the starting, navigation, and operation power requirements of the vehicle 1000. In another embodiment of the present application, the battery 100 may serve not only as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0078] To meet different power requirements, the battery 100 may include multiple battery cells 12, wherein the multiple battery cells 12 can be connected in series, in parallel, or in a hybrid connection. Hybrid connection refers to a mixture of series and parallel connections. The battery 100 may also be referred to as a battery pack. Optionally, multiple battery cells 12 may first be connected in series, in parallel, or in a hybrid connection to form a battery module, and multiple battery modules may then be connected in series, in parallel, or in a hybrid connection to form the battery 100. In other words, multiple battery cells 12 may directly form the battery 100, or they may first form battery modules, which may then form the battery 100.

[0079] For example, please refer to FIG. 2 , which is an exploded view of a battery 100 according to some embodiments of the present application. Battery 100 may include multiple battery cells 12. Battery 100 may also include a housing 11 having a hollow interior, housing multiple battery cells 12. As shown in FIG. 2 , these are referred to as a first portion 111 and a second portion 112, respectively. The first portion 111 and the second portion 112 are snap-fitted together. The shapes of the first portion 111 and the second portion 112 can be determined based on the combined shape of the multiple battery cells 12. Each of the first portion 111 and the second portion 112 may have a single opening. For example, the first portion 111 and the second portion 112 may each be a hollow rectangular parallelepiped with only one open face. The opening of the first portion 111 and the opening of the second portion 112 are positioned opposite each other, and the first portion 111 and the second portion 112 snap-fit ​​together to form the housing 11 having a closed chamber. Multiple battery cells 12 are then placed in parallel, in series, or in a mixed configuration within the housing 11 formed by the snap-fitting of the first portion 111 and the second portion 112.

[0080] Optionally, the battery 100 may also include other structures, which will not be described in detail here. For example, the battery 100 may also include a busbar component, which is used to achieve electrical connection between multiple battery cells 12, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Furthermore, the busbar component can be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of the multiple battery cells 12 can be further led out through the box 11 through the conductive mechanism.

[0081] The number of battery cells 12 can be set to any value according to different power requirements. Multiple battery cells 12 can be connected in series, parallel, or in a hybrid manner to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery 100 may be large, for ease of installation, the battery cells 12 can be grouped, and each group of battery cells 12 constitutes a battery module. The number of battery cells 12 included in a battery module is not limited and can be set according to requirements. The battery 100 may include multiple battery modules, which can be connected in series, parallel, or in a hybrid manner.

[0082] Please refer to Figure 3, which is an exploded view of a battery cell 12 in some embodiments of the present application. The battery cell 12 includes one or more electrode assemblies 122 and a shell 121. The shell 121 may include a housing 1212. The multiple walls of the housing 1212, i.e., the multiple walls of the housing 121, form a cavity, which can be used to accommodate the electrode assembly 122. The housing 1212 is determined according to the shape of the one or more electrode assemblies 122 after being combined. For example, the housing 1212 can be a hollow cuboid, a cube, or a regular polyhedron, and one of the faces of the housing 1212 has an opening so that one or more electrode assemblies 122 can be placed in the housing 1212. The housing 1212 is filled with an electrolyte, such as an electrolyte solution.

[0083] The battery cell 12 may also include two electrode terminals 123, which may be provided on the end cap 1211. The end cap 1211 is generally in the shape of a flat plate, and the two electrode terminals 123 are fixed to the flat surface of the end cap 1211. The two electrode terminals 123 are respectively a positive electrode terminal 123 and a negative electrode terminal 123. Each electrode terminal 123 is provided with a corresponding adapter 124, which is located between the end cap 1211 and the electrode assembly 122 and is used to electrically connect the electrode assembly 122 and the electrode terminal 123. In the battery cell 12, the electrode assembly 122 may be provided as a single electrode assembly or as multiple electrode assemblies according to actual use requirements. A plurality of independent electrode assemblies 122 are provided in the battery cell 12.

[0084] According to some embodiments of the present application, referring to FIG. 4-7 , a battery cell 12 is provided, comprising a housing 121, an electrode terminal 123, and a fixing member 125. The housing 121 comprises a first wall 128, which is provided with a first through-hole 1281. The electrode terminal 123 comprises a main body 1231 and a stepped portion 1232. At least a portion of the main body 1231 is inserted through the first through-hole 1281. The stepped portion 1232 is integrally formed with the main body 1231, protruding from the outer circumference of the main body 1231 and located outside the first wall 128. The fixing member 125 is made of metal and is provided with a second through-hole 1251 for the main body 1231 to pass through. In the thickness direction of the first wall 128, at least a portion of the fixing member 125 is located between the first wall 128 and the stepped portion 1232 and abuts against the stepped portion 1232. In the thickness direction of the first wall 128 , the main body 1231 has a first end surface 12311 facing away from the interior of the housing 121 , the fixing member 125 has a second end surface 1252 facing away from the first wall 128 , and the first end surface 12311 exceeds the second end surface 1252 .

[0085] The housing 121 is a component for accommodating the electrode assembly 122. The housing 121 can also be used to accommodate an electrolyte, such as an electrolyte. In some embodiments, the housing 121 includes a shell 1212 and an end cap 1211. A accommodating cavity is formed inside the shell 1212, and the accommodating cavity is used to accommodate the electrode assembly 122. The shell 1212 has an opening connected to the accommodating cavity. The end cap 1211 covers the opening of the shell 1212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 122 and the electrolyte. Optionally, the housing 121 may also include a bottom plate, and openings are respectively formed at both ends of the shell 1212, one of the openings is closed by the end cap 1211, and the other opening is closed by the bottom plate.

[0086] In some embodiments, the material of the shell 121 can be metal or a combination of metal and non-metal. For example, the shell 121 can be made of metal, such as aluminum, copper, iron, steel or aluminum alloy; for example, part of the shell 121 can be made of metal, and the rest can be made of non-metal, such as the end cover 1211 of the shell 121 can be made of metal, and the shell 1212 or other parts of the shell 121 can be made of non-metallic materials.

[0087] In some embodiments, when assembling the battery cell 12, the electrode assembly 122 may be placed in the housing 1212 first, and the housing 1212 may be filled with electrolyte, and then the end cap 1211 may be placed on the opening of the housing 1212 to complete the assembly of the battery cell 12. Alternatively, in some embodiments, when assembling the battery cell 12, the electrode assembly 122 may be placed in the housing 1212 first, and then the end cap 1211 may be placed on the opening of the housing 1212, and then the housing 1212 may be filled with electrolyte through the injection hole on the end cap 1211 or other part of the housing 121, and then the injection hole may be closed to complete the assembly of the battery cell 12.

[0088] The housing 121 can have various shapes, such as a cylindrical or prismatic structure. The shape of the housing 121 can be determined based on the specific shape of the electrode assembly 122. For example, if the electrode assembly 122 is cylindrical, a cylindrical housing 121 can be used; if the electrode assembly 122 is a square electrode assembly, a square housing can be used.

[0089] The first wall 128 is part of the outer shell 121. The electrode terminal 123 can be mounted on the first wall 128. The electrode terminal 123 can be connected to the tab of the electrode assembly 122 via an adapter. In some embodiments, the first wall 128 can be mounted on the electrode terminal 123 in an insulated manner, for example, an insulating member is provided between the electrode terminal 123 and the first wall 128, and the insulating member insulates and isolates the electrode terminal 123 from the first wall 128. In some embodiments, the first wall 128 can be mounted on the electrode terminal 123, for example, the first wall 128 is directly mounted on the electrode terminal 123. In this case, the first wall 128 can be made of a conductive material or an insulating material. In some embodiments, the first wall 128 can be made of a conductive material, such as a metal material, for example, the first wall 128 is made of aluminum, copper, iron, aluminum, steel, or an aluminum alloy. In other embodiments, the first wall 128 can be made of a non-metallic material, such as plastic.

[0090] In some embodiments, the first wall 128 may be an end cap 1211 of the housing 121. The housing 1212 of the housing 121 is disposed around the edge of the first wall 128. The first wall 128 may be connected to the housing 1212 of the housing 121 by welding, bonding, snapping, or other connection methods. Alternatively, the first wall 128 and the housing 1212 may be integrally formed.

[0091] The electrode terminal 123 is a component mounted on the first wall 128. The electrode terminal 123 can be connected to the tab of the electrode assembly 122 via an adapter, allowing current to flow into or out of the tab through the electrode terminal 123. In some embodiments, the electrode terminal 123 can have a cylindrical structure or a polygonal prism structure. In some embodiments, the electrode terminal 123 is made of a metal material, such as aluminum, copper, iron, steel, an alloy, or a composite metal.

[0092] The inner side mentioned below refers to the electrode assembly 122. The outer shell 121 generally has a housing cavity for accommodating the electrode assembly 122. The wall of the outer shell 121 facing the housing cavity is collectively referred to as the inner side, and the wall of the outer shell 121 facing away from the housing cavity is collectively referred to as the outer side.

[0093] The step portion 1232 and the main body 1231 can be integrally formed by machining, or a portion of the material of the main body 1231 can be pressed to the outer periphery of the main body 1231 to form the step portion 1232. In embodiments where the step portion 1232 and the main body 1231 are integrally formed by machining, in some cases, the fixing member 125 can be first fixed to the first wall 128 using fasteners, and then, after the step portion 1232 and the fixing member 125 are in contact, the step portion 1232 can be welded to the fixing member 125 to complete the assembly of the electrode terminal 123.

[0094] First end surface 12311 extends beyond second end surface 1252, meaning that, outside battery 100, second end surface 1252 is located between first end surface 12311 and the outer surface of first wall 128 in the thickness direction of first wall 128. In other words, first end surface 12311 of electrode terminal 123 is the surface farthest from the outer surface of first wall 128.

[0095] In some embodiments, the first end surface 12311 of the electrode terminal 123 can be welded to a tab of the busbar to electrically connect the battery cell 12 to the busbar, thereby extracting the electrical energy stored in the battery cell 12. In other words, the fixing member 125 only serves to facilitate the assembly of the electrode terminal 123 and does not conduct electrical energy.

[0096] The outer contour of the fixing member 125 may include but is not limited to a circle, an ellipse, a polygon, a semicircle, etc.

[0097] The fixing member 125 is made of metal material, such as aluminum, copper, iron, steel, alloy or composite metal.

[0098] The step portion 1232 may be continuously distributed along the circumference of the main body 1231 , i.e., in a ring shape, or may be segmented along the circumference of the main body 1231 , i.e., divided into multiple parts, at least one of which abuts against the fixing member 125 .

[0099] The first through hole 1281 can be a light hole or a segmented stepped hole. In the embodiment where the first through hole 1281 is a stepped hole, the cross section of the stepped hole can include at least one straight line segment and / or at least one oblique line segment and / or at least one arc segment.

[0100] The second through hole 1251 can be a light hole or a segmented stepped hole. In the embodiment where the second through hole 1251 is a stepped hole, the cross section of the stepped hole can include at least one straight line segment and / or at least one oblique line segment and / or at least one arc segment.

[0101] The outer peripheral surface of the main body 1231 can refer to the outer peripheral surface of a cylinder, or it can refer to the peripheral surface of a prism connecting the top surface and the bottom surface of the prism. Taking the main body 1231 as a quadrangular prism as an example, the main body 1231 includes a top surface, a bottom surface and four side surfaces. The four side surfaces are connected in sequence and surrounded by the top surface. The four side surfaces are connected to the top surface and the bottom surface at both ends in the direction in which the top surface points to the bottom surface. The above four side surfaces refer to the outer peripheral surface of the main body 1231.

[0102] In some embodiments, the first end surface 12311 is provided with a first groove 1234, and the side surface of the first groove 1234 can also be referred to as the outer peripheral surface of the main body 1231. In this embodiment, the cross section of the main body 1231 is shaped like a "convex" character.

[0103] In the technical solution of the embodiment of the present application, the housing 121 includes a first wall 128, which is provided with a first through-hole 1281. The electrode terminal 123 includes a main body 1231 and a stepped portion 1232. At least a portion of the main body 1231 is inserted into the first through-hole 1281. The stepped portion 1232 is integrally formed with the main body 1231, protruding from the outer circumference of the main body 1231 and located outside the first wall 128. The fixing member 125 is provided with a second through-hole 1251 for the main body 1231 to pass through. In the thickness direction of the first wall 128, at least a portion of the fixing member 125 is located between the first wall 128 and the stepped portion 1232 and abuts against the stepped portion 1232. In the thickness direction of the first wall 128, the main body 1231 has a first end surface 12311 facing away from the interior of the outer shell 121, and the fixing member 125 has a second end surface 1252 facing away from the first wall 128, with the first end surface 12311 extending beyond the second end surface 1252. With this design, in the thickness direction of the first wall 128, the surface of the battery cell 12 that extends the greatest height beyond the outer surface of the first wall 128 is the first end surface 12311. When using electrode terminals 123 of the same specifications, the height of the battery cell 12 extending beyond the first wall 128 can be correspondingly reduced, thereby increasing the proportion of the space inside the outer shell 121 of the battery cell 12 to the total space of the battery 100, thereby improving the energy density of the battery 100.

[0104] According to some embodiments of the present application, referring to FIG. 4 to FIG. 7 , the yield strength of the fixing member 125 is greater than the yield strength of the electrode terminal 123 .

[0105] The yield strength of the fixing member 125 is greater than the yield strength of the electrode terminal 123, meaning that when an external force acts on the electrode terminal 123 and the fixing member 125, the fixing member 125 is less likely to undergo plastic deformation than the electrode terminal 123, such as the stepped portion 1232 of the electrode terminal 123. If the strength of the electrode terminal 123 is greater than the strength of the fixing member 125, after the stepped portion 1232 of the electrode terminal 123 overlaps the fixing member 125, and an external force acts on the electrode terminal 123, such as the stepped portion 1232, the fixing member 125 is likely to undergo significant plastic deformation. In this case, the electrode terminal 123 is likely to wobble, and the seal between the electrode terminal 123 and the housing 121 is likely to fail.

[0106] Generally speaking, for the same material, the thicker the material, the greater its yield strength. This is because increasing the material thickness can cause greater deformation, thereby consuming more strain energy, thereby increasing the material's yield strength. The yield strength of the fixing member 125 is greater than the yield strength of the electrode terminal 123. This means that when the design value of the yield strength of the electrode terminal 123 is fixed, a relatively thin fixing member 125 can be selected to achieve the predetermined yield strength of the fixing member 125.

[0107] The yield strength of the fixing member 125 is greater than the yield strength of the electrode terminal 123. This design allows the fixing member 125 to be relatively thin when a stable connection is formed between the step portion 1232 and the fixing member 125. This further reduces the height of the electrode terminal 123 extending beyond the outer surface of the first wall 128, thereby further improving the energy density of the battery 100.

[0108] In the present application, the material sample mentioned below may refer to the fixing part 125 or part of the fixing part 125 or the main body 1231 or part of the main body 1231. There are many methods for testing the yield strength, for example, a tensile test: in a tensile test, the material sample is loaded until it breaks, and the yield strength can be calculated by measuring the load and deformation. For example, a compression test: in a compression test, the material sample is loaded until it yields, and the yield strength can be obtained by measuring the load and deformation. For example, a bending test: the yield strength can be obtained by applying a bending moment to the sample and observing the deformation of the sample. The appropriate method for testing can be selected according to the actual situation.

[0109] According to some embodiments of the present application, referring to FIG. 4 to FIG. 7 , the yield strength of the fixing member 125 is σs1, and the yield strength of the electrode terminal 123 is σs2, satisfying: 1.1≤σs1 / σs2≤10.

[0110] The ratio of the yield strength of the fixing member 125 to the yield strength of the electrode terminal 123 can be any value between 1.1 and 10, for example, 1.1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10.

[0111] By designing the ratio of the yield strength of the fixing member 125 to the yield strength of the electrode terminal 123 within a reasonable range, the deformation caused by the assembly force when the electrode terminal 123 and the fixing member 125 are connected can be within a controllable range, thereby reducing the difficulty of assembly, reducing the risk of damage to the electrode terminal 123, and improving the stability of the connection between the two.

[0112] According to some embodiments of the present application, please refer to Figures 4 to 7, 3≤σs1 / σs2≤5.

[0113] The ratio of the yield strength of the fixing member 125 to the yield strength of the electrode terminal 123 can be any value between 3 and 5, for example, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.

[0114] By designing the ratio of the yield strength of the fixing member 125 to the yield strength of the electrode terminal 123 within a reasonable range, the deformation caused by the assembly force when the electrode terminal 123 and the fixing member 125 are connected can be within a controllable range, further reducing the difficulty of assembly, significantly reducing the risk of damage to the electrode terminal 123, and further improving the stability of the connection between the two.

[0115] According to some embodiments of the present application, please refer to Figures 4 to 7, 205Mpa≤σs1≤250Mpa, 40Mpa≤σs2≤55Mpa.

[0116] The yield strength of the fixing member 125 can be any value between 205 MPa and 250 MPa, for example, 205 MPa, 210 MPa, 215 MPa, 220 MPa, 225 MPa, 230 MPa, 235 MPa, 240 MPa, 245 MPa, and 250 MPa.

[0117] The yield strength of the electrode terminal 123 may be 40 MPa, 41 MPa, 42 MPa, 43 MPa, 44 MPa, 45 MPa, 46 MPa, 47 MPa, 48 MPa, 49 MPa, 50 MPa, 51 MPa, 52 MPa, 53 MPa, 54 MPa, or 55 MPa.

[0118] By designing the yield strength of the fixing member 125 and the yield strength of the electrode terminal 123 within a reasonable range, the plasticity and brittleness of the fixing member 125 and the electrode terminal 123 can be designed within a controllable range, reducing the risk of damage to the fixing member 125 and the electrode terminal 123 during assembly.

[0119] According to some embodiments of the present application, please refer to Figures 4 to 7. In the thickness direction of the first wall 128, the height difference between the first end face 12311 and the second end face 1252 is D, and the thickness of the step portion 1232 is t, satisfying: 1.1≤D / t≤6.

[0120] In the thickness direction of the first wall 128, the ratio of the height difference between the first end face 12311 and the second end face 1252 to the thickness of the step portion 1232 can be any value between 1.1 and 6, for example, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.

[0121] In the thickness direction of the first wall 128, the ratio of the height difference between the first end face 12311 and the second end face 1252 and the thickness of the step portion 1232 is designed to be within a reasonable range. This can reduce the risk of failure of the connection between the step portion 1232 and the fixing member 125 when the battery cell 12 is subjected to external force, and improve the stability of the connection between the step portion 1232 and the fixing member 125.

[0122] According to some embodiments of the present application, please refer to FIG. 7 , 0.5 mm ≤ D ≤ 3 mm, 0.5 mm ≤ t ≤ 2.5 mm.

[0123] In the thickness direction of the first wall 128, the height difference between the first end face 12311 and the second end face 1252 can be any value between 0.5mm and 3mm, for example, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm.

[0124] In the thickness direction of the first wall 128, the thickness of the step portion 1232 can be any value between 0.5 mm and 2.5 mm, for example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm.

[0125] In the thickness direction of the first wall 128, the height difference between the first end face 12311 and the second end face 1252 and the thickness of the step portion 1232 are designed to be within a reasonable range, so as to improve the energy density of the battery 100 while ensuring better connection stability between the two.

[0126] According to some embodiments of the present application, referring to FIG. 4 to FIG. 7 , in the radial direction of the main body 1231 , the fixing member 125 extends beyond the outer circumferential surface of the step portion 1232 .

[0127] The radial direction of the main body 1231 refers to the direction perpendicular to the axis of the main body 1231. Alternatively, it refers to the direction of the line connecting the center of any cross section of the main body 1231 perpendicular to its axis and each point on its edge. In the thickness direction of the first wall 128, the main body 1231 may include multiple sections, each with its own axis. The radial direction refers to the direction within each section that is perpendicular to the corresponding axis of the main body 1231.

[0128] In the radial direction of the main body 1231, the fixing member 125 extends beyond the outer circumference of the stepped portion 1232. This design prevents the stepped portion 1232 from contacting other components of the battery cell 12 after abutting the fixing member 125. The stability of the connection between the electrode terminal 123 and the fixing member 125 can be controlled by only considering the characteristics of the fixing member 125 and the stepped portion 1232, thus reducing design complexity.

[0129] According to some embodiments of the present application, referring to FIG. 8 , in the radial direction of the main body 1231 , the projection of the fixing member 125 and the projection of the step portion 1232 at least partially overlap.

[0130] In the radial direction of the main body 1231 , the projection of the fixing member 125 and the projection of the step portion 1232 at least partially overlap, which means that in the thickness direction of the first wall 128 , at least a portion of the step portion 1232 is accommodated in the fixing member 125 .

[0131] In some embodiments, the fixing member 125 is provided with an annular groove, which can accommodate a portion of the step portion 1232 .

[0132] In the radial direction of the main body 1231, the projection of the fixing member 125 at least partially overlaps with the projection of the step portion 1232. This design further reduces the height of the step portion 1232 beyond the outer surface of the first wall 128, further improving the energy density of the battery 100.

[0133] According to some embodiments of the present application, referring to FIG. 8 , at least a portion of the step portion 1232 is accommodated in the second through hole 1251 .

[0134] In some embodiments, the second through hole 1251 includes a first section and a second section. In the thickness direction of the first wall 128, the second section is located between the first section and the first wall 128. The aperture of the second section is larger than the aperture of the first section. The second section and the first section form a stepped hole, and the step portion 1232 overlaps the bottom wall of the hole of the second section.

[0135] The second through hole 1251 is used to accommodate part of the step portion 1232 , and there is no need to additionally process a space for accommodating the step portion 1232 , thereby reducing the processing flow, saving costs, and improving the structural consistency of the fixing member 125 .

[0136] According to some embodiments of the present application, referring to FIG. 8 , the diameter of the second through hole 1251 gradually decreases in a direction approaching the first wall 128 , and the step portion 1232 abuts against the hole wall of the second through hole 1251 .

[0137] The aperture of the second through hole 1251 gradually decreases in the direction approaching the first wall 128, which means that the hole wall of the second hole is a conical surface. Generally speaking, compared with the second through hole 1251 which is a multi-stage stepped hole, the step portion 1232 needs to contact the hole wall surface to maintain a relatively stable connection strength. The step portion 1232 only needs to contact the point of the conical hole wall to form a relatively stable connection, and the assembly difficulty is lower.

[0138] When the step portion 1232 is connected to the fixing member 125 , the reserved matching tolerance range is larger, thereby reducing the difficulty of assembly.

[0139] According to some embodiments of the present application, referring to FIG. 8 , the step portion 1232 has a third end surface 12321 facing away from the first wall 128 , and in the thickness direction of the first wall 128 , the second end surface 1252 extends beyond the third end surface 12321 or is flush with the third end surface 12321 .

[0140] In the thickness direction of the first wall 128 , the second end surface 1252 extends beyond the third end surface 12321 or is flush with the third end surface 12321 , which means that in an embodiment where the battery cell 12 includes a fixing member 125 , the step portion 1232 does not occupy any additional space inside the battery 100 .

[0141] The stepped portion 1232 has a third end surface 12321 facing away from the first wall 128. In the thickness direction of the first wall 128, the second end surface 1252 extends beyond or is flush with the third end surface 12321. This design means that the stepped portion 1232 is completely contained within the fixing member 125 in the thickness direction of the first wall 128, further improving the energy density of the battery 100.

[0142] According to some embodiments of the present application, referring to FIG. 7 , in the radial direction of the main body 1231 , the dimension of the step portion 1232 protruding from the outer circumferential surface of the main body 1231 is W1, and 0.1 mm ≤ W1 ≤ 5 mm.

[0143] The dimension of the step portion 1232 protruding from the outer peripheral surface of the main body 1231 can be any value between 0.1mm and 5mm, for example, 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm.

[0144] Designing the dimension of the step portion 1232 protruding from the outer circumference of the main body 1231 within a reasonable range is beneficial to increasing the contact area between the step portion 1232 and the fixing member 125 , thereby increasing the connection strength between the step portion 1232 and the fixing member 125 .

[0145] According to some embodiments of the present application, please refer to Figures 4 and 7, the edge of the first end face 12311 is provided with a first groove 1234 extending along the circumference of the main body 1231, and the step portion 1232 has a fourth end face facing away from the first wall 128, and the fourth end face is coplanar with the bottom surface of the first groove 1234.

[0146] In some embodiments, a certain pressure can be applied to the edge of the first end surface 12311 by a pressing device, thereby forming a first groove 1234 in the circumference of the main body 1231, and the original material in the first groove 1234 will be squeezed to the circumferential side of the main body 1231 to form a step portion 1232.

[0147] The edge of the first end surface 12311 is provided with a first groove 1234 extending along the circumference of the main body 1231. The step portion 1232 has a fourth end surface facing away from the first wall 128, and the fourth end surface is coplanar with the bottom surface of the first groove 1234. This design allows the step portion 1232 to be formed by pressing, and the electrode terminal 123 to be connected to the fixing member 125 by riveting, which reduces assembly cost and difficulty.

[0148] According to some embodiments of the present application, referring to FIG. 7 , in the radial direction of the main body 1231 , the distance between the side surface of the first groove 1234 and the outer peripheral surface of the step portion 1232 is W2 , satisfying: 0.5 mm ≤ W2 ≤ 10 mm.

[0149] The distance between the side surface of the first groove 1234 and the outer peripheral surface of the step portion 1232 can be any value between 0.5 mm and 10 mm, for example, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, and 10 mm.

[0150] By designing the distance between the side surface of the first groove 1234 and the outer peripheral surface of the step portion 1232 within a reasonable range, the difficulty of forming the step portion 1232 by pressing can be reduced, thereby reducing the assembly difficulty and the direct cost of the equipment.

[0151] According to some embodiments of the present application, referring to FIG. 7 , the groove depth of the first groove 1234 is T, which satisfies: 0.1 mm ≤ T ≤ 5 mm.

[0152] The depth of the first groove 1234 can be any value between 0.1 mm and 5 mm, for example, 0.1 mm, 0.2 mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm , 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm.

[0153] By designing the groove depth of the first groove 1234 within a reasonable range, the difficulty of forming the step portion 1232 and the first groove 1234 by pier pressing can be reduced, thereby reducing the assembly difficulty and the direct cost of the equipment.

[0154] According to some embodiments of the present application, the material of the fixing member 125 includes steel, and the material of the electrode terminal 123 includes aluminum or a copper-aluminum composite material. In the production of the battery 100, the application process of steel, aluminum or a copper-aluminum composite material is relatively mature, which can reduce design costs.

[0155] According to some embodiments of the present application, referring to FIG. 7 and FIG. 8 , the battery cell 12 further includes a first insulating member 126 , and at least a portion of the first insulating member 126 is disposed between the fixing member 125 and the first wall 128 .

[0156] The first insulating member 126 is made of an insulating material. The material of the first insulating member 126 can be selected from insulating and electrolyte-resistant materials such as polypropylene, polycarbonate, polytetrafluoroethylene, polyvinyl chloride, polyethylene, and polyester resin.

[0157] The battery cell 12 also includes a first insulating member 126, at least partially disposed between the fixing member 125 and the first wall 128. The provision of the first insulating member 126 can reduce the risk of short circuits between the positive and negative electrode terminals 123 in the battery 100. Furthermore, it can position certain components within the battery cell 12, thereby ensuring greater assembly stability.

[0158] According to some embodiments of the present application, please refer to Figures 7 and 8, the first insulating member 126 includes a main body portion 1261 and a first extension portion 1262, the main body portion 1261 is located between the fixing member 125 and the first wall 128, the main body portion 1261 is provided with a third through hole 12611 for the supply terminal 123 to pass through, and the first extension portion 1262 is located on the periphery of the fixing member 125 and is surrounded by the edge of the main body portion 1261.

[0159] The thickness of the first extension portion 1262 can be the same as that of the body portion 1261, or can be greater or less than that of the body portion 1261. In some embodiments, referring to FIG7 , the cross-sectional shapes of the first extension portion 1262 and the body portion 1261 are two opposing L-shaped shapes.

[0160] The first insulating member 126 includes a main body 1261 and a first extension 1262. The main body 1261 is located between the fixing member 125 and the first wall 128. The main body 1261 is provided with a third through-hole 12611 through which the electrode terminal 123 passes. The first extension 1262 is located on the periphery of the fixing member 125 and surrounds the edge of the main body 1261. This design allows the fixing member 125 to be pre-positioned and limited in the radial direction of the main body 1231, reducing assembly difficulty and improving assembly stability of the fixing member 125. Furthermore, the fixing member 125 and the first wall 128 are insulated and isolated, improving the overcurrent stability of the electrode terminal 123.

[0161] According to some embodiments of the present application, referring to FIG. 4 and FIG. 8 , a second groove 1282 is provided on the outer surface of the first wall 128 , and the main body 1261 is located in the second groove 1282 .

[0162] The outline of the groove may be a quadrilateral, a pentagon, a hexagon, etc., and the outline of the groove may include one or more arc segments and at least one straight line segment.

[0163] The outer surface of the first wall 128 is provided with a second groove 1282, and the main body 1261 is located in the second groove 1282. This design allows the first insulating member 126 to be pre-positioned by the second groove 1282 when assembled with the first wall 128, facilitating the assembly of the first insulating member 126.

[0164] According to some embodiments of the present application, referring to FIG7 , in the thickness direction of the first wall 128 , the end of the first extension portion 1262 extends out of the second groove 1282 . This design can further improve the insulation between the fixing member 125 and the first wall 128 .

[0165] According to some embodiments of the present application, please refer to Figure 8, the first insulating member 126 also includes a second extension portion 1263, the second extension portion 1263 is arranged around the third through hole 12611, one end of the second extension portion 1263 is connected to the main body portion 1261, and the other end of the second extension portion 1263 extends in a direction close to the main body 1231.

[0166] The other end of the second extension portion 1263 can extend close to the main body 1231 along the radial direction of the main body 1231, or can extend close to the main body 1231 along the direction intersecting with the radial direction of the main body 1231. Please refer to Figure 8, the extension direction of the second extension portion 1263 intersects with the extension direction of the main body 1261.

[0167] In the embodiment where the aperture of the second through hole 1251 gradually decreases in the direction approaching the first wall 128, the extension direction of the second extension portion 1263 intersects with the extension direction of the main body portion 1261, and the hole wall of the second through hole 1251 can provide a certain supporting force when the step portion 1232 abuts against the fixing member 125, thereby reducing the risk of the first insulating member 126 being crushed.

[0168] The second extension portion 1263 can also provide a pre-positioning effect for the electrode terminal 123 , such as the body 1231 of the electrode terminal 123 .

[0169] The first insulating member 126 further includes a second extension portion 1263, which is disposed around the third through hole 12611. One end of the second extension portion 1263 is connected to the main body 1261, and the other end of the second extension portion 1263 extends toward the main body 1231. This design improves the insulation between the electrode terminal 123 and the first wall 128.

[0170] According to some embodiments of the present application, please refer to Figures 4, 7 and 8, the electrode terminal 123 also includes a limiting portion 1233, the limiting portion 1233 protrudes from the outer peripheral surface of the main body 1231, and the limiting portion 1233 is located on the inner side of the first wall 128. The limiting portion 1233 is used to limit the movement of the electrode terminal 123 toward the outside of the shell 121.

[0171] In an embodiment in which the electrode terminal 123 is connected to the first wall 128 by riveting, the electrode terminal 123 can be passed through the first through hole 1281 in advance, and the main body 1231 can be pressed to form a riveted portion. At this time, under the restriction of the limiting portion 1233, the electrode terminal 123 can be fixed on the first wall 128. In other words, the limiting portion 1233 can limit the movement of the electrode terminal 123 in a direction away from the inner side of the battery cell 12.

[0172] The electrode terminal 123 also includes a stopper 1233, which protrudes from the outer circumference of the main body 1231 and is located inside the first wall 128. The stopper 1233 is used to limit the movement of the electrode terminal 123 outside the housing 121. This design allows the electrode terminal 123 to be assembled with the housing 121 by riveting, reducing assembly difficulty.

[0173] According to some embodiments of the present application, referring to FIG. 4 , FIG. 7 and FIG. 8 , the battery cell 12 further includes a seal 127 , and the seal 127 is at least partially located between the first wall 128 and the limiting portion 1233 .

[0174] The seal 127 is at least partially located between the first wall 128 and the limiting portion 1233, which means that during the process of riveting the electrode terminal 123 to the first wall 128, the assembly force generated by the riveting can cause the first wall 128 and the limiting portion 1233 to squeeze the seal 127, causing the seal 127 to deform and fill the gap between the first wall 128 and the electrode terminal 123 as much as possible, that is, the assembly and positioning of the seal 127 are adaptively completed during the riveting process of the electrode terminal 123.

[0175] The battery cell 12 further includes a seal 127, which is at least partially located between the first wall 128 and the limiting portion 1233. This design can improve the sealing performance of the interior of the housing 121 and improve the operating stability of the battery cell 12.

[0176] According to some embodiments of the present application, please refer to Figures 9 to 12. The battery cell 12 also includes an electrode assembly 122 and an adapter. The electrode assembly 122 is arranged inside the shell 121. The adapter connects the electrode terminal 123 and the electrode assembly 122. The electrode terminal 123 is provided with a positioning portion 15, and the positioning portion 15 is used to position the adapter.

[0177] In Figures 9 to 12 , the upper side is the inner side, and the lower side is the outer side.

[0178] Battery cells 12 often experience electrical connection failure between the electrode terminals 123 and the adapter, leading to internal short circuits in the battery cells 12 and affecting the reliability of the battery 100. During the manufacturing process of the battery 100, because there is no positioning structure between the electrode terminals 123 and the adapter, the welding process between the electrode terminals 123 and the adapter is prone to inaccurate welding positions and poor solder joints, resulting in electrical connection failure between the electrode terminals 123 and the adapter, affecting the reliability of the battery 100.

[0179] The adapter is a component that connects the electrode assembly 122 and the electrode terminal 123. For example, the adapter connects the tab of the electrode assembly 122 and the electrode terminal 123. In some embodiments, referring to FIG9 , the adapter may include a terminal connection portion 1240, a tab connection portion 1241, and an intermediate connection portion 1242 that are interconnected. The terminal connection portion 1240 and the tab connection portion 1241 are connected via the intermediate connection portion 1242. The terminal connection portion 1240 is connected to the electrode terminal 123, and the tab connection portion 1241 is connected to the tab of the electrode assembly 122. The terminal connection portion 1240 can be welded to the electrode terminal 123, for example, the terminal connection portion 1240 and the electrode terminal 123 can be connected by laser welding. In some embodiments, the electrode terminal 123 is made of a metal material, for example, aluminum, copper, iron, steel, an alloy, or a composite metal.

[0180] The positioning portion 15 is a component provided on the electrode terminal 123. The function of the positioning portion 15 includes positioning the adapter. The function of positioning the adapter includes making the relative position relationship between the adapter and the electrode terminal 123 at a preset point, so that when welding the adapter and the electrode terminal 123, the weld mark is in the correct position, so that the welding quality of the adapter and the electrode terminal 123 is high and the connection stability is high. Among them, "the relative position relationship between the adapter and the electrode terminal 123 is at a preset point" can be connected from not being at a preset point. For example, in some embodiments, a groove is formed on the surface of the electrode terminal 123 facing the adapter. When the adapter and the electrode terminal 123 are not positioned in place, there is a situation where the action position of the laser falls in the groove during welding, causing part of the weld mark to fall in the groove. This situation can cause the adapter and the electrode terminal 123 to be poorly welded, resulting in low welding quality and failure of the connection between the adapter and the electrode terminal 123. For another example, in some embodiments, when the adapter and the electrode terminal 123 are not positioned in place, there is a situation where the laser action position during welding falls outside the adapter and / or the electrode terminal 123, causing the weld mark to fall outside the adapter and / or the electrode terminal 123. This situation may cause a poor weld between the adapter and the electrode terminal 123, resulting in low welding quality and failure of the connection between the adapter and the electrode terminal 123.

[0181] In some embodiments, the positioning portion 15 may include a protrusion provided on the electrode terminal 123, which is used to constrain the adapter to position the adapter. For example, the wall surface of the protrusion can constrain the wall surface of the adapter to achieve the positioning of the adapter. In other embodiments, the positioning portion 15 may include a protrusion and / or a recessed groove, the adapter is correspondingly provided with a recessed groove and / or a protrusion, and the positioning portion 15 and the adapter are positioned by cooperating with a concave-convex structure. In other embodiments, the positioning portion 15 may include a protrusion provided on the electrode terminal 123, which is used to constrain the adapter to position the adapter; and the positioning portion 15 may include a protrusion and / or a recessed groove, the adapter is correspondingly provided with a recessed groove and / or a protrusion, and the positioning portion 15 and the adapter are positioned by cooperating with a concave-convex structure.

[0182] The battery cell 12 also includes an electrode assembly 122 and an adapter. The electrode assembly 122 is disposed within the housing 121. The adapter connects the electrode terminal 123 to the electrode assembly 122. The electrode terminal 123 is provided with a positioning portion 15, which is used to position the adapter. This design effectively positions the adapter, allowing the adapter and electrode terminal 123 to be welded in the correct position. This reduces the risk of a faulty weld causing the electrical connection between the adapter and electrode terminal 123 to fail, leading to a short circuit within the battery cell 12, and thus provides the battery 100 with higher reliability.

[0183] According to some embodiments of the present application, referring to FIG. 9 to FIG. 12 , the adapter is provided with a positioning fitting portion 16 , and the positioning fitting portion 16 cooperates with the positioning portion 15 .

[0184] The positioning matching portion 16 is a component provided on the adapter and is used to cooperate with the positioning portion 15 to position the adapter.

[0185] In some embodiments, the positioning portion 15 and the positioning and matching portion 16 may include mutually cooperating concave and convex structures, such as a recessed groove and a protrusion, a latch and a latch hole, etc. The positioning portion 15 may include a protrusion provided on the end surface of the electrode terminal 123 facing the adapter, and the positioning and matching portion 16 may include a recessed groove or a through hole provided on the adapter.

[0186] By providing a positioning matching portion 16 on the adapter that can cooperate with the positioning portion 15, the positioning accuracy between the adapter and the electrode terminal 123 can be effectively improved, thereby effectively reducing the risk of electrical connection failure between the adapter and the electrode terminal 123 due to cold soldering, so that the battery 100 has higher reliability.

[0187] According to some embodiments of the present application, referring to FIG. 9 to FIG. 12 , one of the positioning portion 15 and the positioning matching portion 16 includes a positioning groove 160 , and the other includes a positioning protrusion 150 .

[0188] The positioning mating portion 16 and the positioning portion 15 comprise mutually mating concave and convex structures. The positioning protrusion 150 may be a protruding block-shaped structure. The positioning protrusion 150 may be cylindrical, prismatic, or have other shapes. The positioning groove 160 is a groove-shaped structure that mates with the positioning protrusion 150. The positioning groove 160 may be a blind hole formed on the surface of the adapter facing the electrode terminal 123, or it may be a through hole formed in the adapter.

[0189] In some embodiments, the positioning portion 15 includes a positioning protrusion 150, and the positioning mating portion 16 includes a positioning groove 160. In some embodiments, the positioning portion 15 may include a positioning groove 160, and the positioning mating portion 16 may include a positioning protrusion 150. In other embodiments, the positioning portion 15 may include a positioning groove 160 and a positioning protrusion 150, and the positioning mating portion 16 may include a positioning protrusion 150 and a positioning groove 160, wherein the positioning groove 160 of the positioning portion 15 cooperates with the positioning protrusion 150 of the positioning mating portion 16, and the positioning protrusion 150 of the positioning portion 15 cooperates with the positioning groove 160 of the positioning mating portion 16.

[0190] In some embodiments, when the positioning portion 15 includes a positioning protrusion 150, the material of the positioning protrusion 150 can be the same as or different from the material of the electrode terminal 123. For example, the positioning protrusion 150 can be made of a metal material such as aluminum, copper, iron, steel, alloy, or composite metal. In another example, the positioning protrusion 150 can be made of a non-metallic material such as plastic. In some embodiments, the positioning protrusion 150 can be connected to the electrode terminal 123 by bonding, welding, screw connection, etc. In other embodiments, the positioning protrusion 150 can also be manufactured integrally with the electrode terminal 123. In some embodiments, when the positioning portion 15 includes a positioning groove 160, the positioning groove 160 can be formed in the electrode terminal 123 by stamping, hollowing, or other processes. Alternatively, the positioning groove 160 can be formed based on the formation of the electrode terminal 123, for example, when the electrode terminal 123 is formed by casting, the positioning groove 160 is formed at the same time. Alternatively, the electrode terminal 123 is formed on the electrode terminal 123 during the process of being assembled on the first wall 128 . For example, the electrode terminal 123 is fixed to the first wall 128 by riveting, and the positioning groove 160 is a groove formed by the riveting process.

[0191] In some embodiments, when the positioning mating portion 16 includes a positioning protrusion 150, the material of the positioning protrusion 150 can be the same as or different from the material of the adapter. For example, the positioning protrusion 150 is made of a metal material, such as aluminum, copper, iron, steel, alloy, or composite metal. For another example, the positioning protrusion 150 is made of a non-metallic material, such as plastic. In some embodiments, the positioning protrusion 150 can be connected to the adapter by bonding, welding, or screw connection. In other embodiments, the positioning protrusion 150 can also be manufactured integrally with the adapter. In some embodiments, when the positioning portion 15 includes a positioning groove 160, the positioning groove 160 can be formed in the adapter by stamping, digging, or other processes, or the positioning groove 160 can be formed based on the formation of the adapter, for example, the adapter is formed by casting, and the positioning groove 160 is formed when the adapter is cast.

[0192] By defining one of the positioning portion 15 and the positioning matching portion 16 as including a positioning groove 160 and the other as including a positioning protrusion 150, so that the adapter and the electrode terminal 123 are positioned and matched with each other through the concave and convex structure, the positioning accuracy between the adapter and the electrode terminal 123 can be effectively improved, thereby effectively reducing the risk of electrical connection failure between the adapter and the electrode terminal 123 due to cold welding, so that the battery 100 has higher reliability.

[0193] According to some embodiments of the present application, referring to Figures 9-12, electrode terminal 123 has a first surface 12331 facing electrode assembly 122 along the thickness direction of first wall 128. First surface 12331 is formed with a third groove 12332. The adapter is welded to electrode terminal 123 to form a first weld mark 17. Along the thickness direction of first wall 128, first weld mark 17 and third groove 12332 do not overlap.

[0194] The first surface 12331 may be a surface of the electrode terminal 123 facing the electrode assembly 122 . The first surface 12331 may be welded to the adapter and form a first weld mark 17 .

[0195] The third groove 12332 is a groove-like structure formed on the first surface 12331. In some embodiments, to improve the mass energy density of the battery cell 12, a groove may be cut on the surface to reduce the mass of the electrode terminal 123. In some embodiments, the third groove 12332 is formed on the surface of the electrode terminal 123 due to assembly process factors. For example, the electrode terminal 123 may be riveted to the first wall 128. During the riveting process, the rivet head moves from the inner side of the first wall 128 toward the outer side, pressing against the first surface 12331 to form a flange portion that is pressed against the inner side of the first wall 128. The rivet groove formed by the riveting process is the third groove 12332 formed on the first surface 12331.

[0196] “The first weld mark 17 does not overlap with the third groove 12332 along the thickness direction of the first wall 128 ” can be understood as that when welding the adapter and the electrode terminal 123 , the portion where the laser acts on the adapter and the electrode terminal 123 does not overlap with the third groove 12332 .

[0197] In order to ensure that "the first weld mark 17 does not overlap with the third groove 12332 along the thickness direction of the first wall 128", the battery cell 12 is provided with a positioning portion 15 to improve the positioning accuracy of the adapter and the electrode terminal 123, and reduce the risk of the laser acting on the adapter and the electrode terminal 123 overlapping with the third groove 12332, resulting in a cold weld.

[0198] A third groove 12332 is formed on the first surface 12331 of the electrode terminal 123. To reduce the risk of the electrode terminal 123 and the adapter overlapping with the welding position due to inaccurate positioning during assembly, causing at least a portion of the first weld mark 17 to fall within the third groove 12332, resulting in a cold weld between the electrode terminal 123 and the adapter, and thus causing the electrical connection between the electrode terminal 123 and the adapter to fail, the above-mentioned solution provides a positioning portion 15 on the electrode terminal 123, which can effectively position the adapter, allowing the adapter and the electrode terminal 123 to be welded in the correct posture, thereby reducing the risk of the electrical connection between the adapter and the electrode terminal 123 failing due to a cold weld, thereby ensuring higher reliability of the battery 100.

[0199] According to some embodiments of the present application, referring to FIG. 9 to FIG. 12 , the first weld mark 17 is disposed around the third groove 12332 .

[0200] The first weld mark 17 can be annular and arranged around the third groove 12332. In some embodiments, the first weld mark 17 can completely surround or partially surround the third groove 12332. In some embodiments, the first weld mark 17 can be at least partially annular or square.

[0201] By setting the first weld mark 17 to surround the third groove 12332, the connection area between the adapter and the electrode terminal 123 can be increased, the connection stability between the adapter and the electrode terminal 123 can be improved, and the risk of electrical connection failure can be reduced, so that the battery 100 has higher reliability.

[0202] According to some embodiments of the present application, referring to Figures 9-12, the housing 121 includes a shell 1212 and an end cap 1211. The shell 1212 includes a bottom wall and side walls surrounding the bottom wall. One end of the side wall is connected to the bottom wall, and the other end forms an opening. The end cap 1211 is used to cover the opening. The first wall 128 serves as the end cap 1211 or the bottom wall. This design expands the application scenarios of the battery cell 12.

[0203] According to some embodiments of the present application, the present application provides a battery 100 including the battery cell 12 described in any of the above solutions.

[0204] According to some embodiments of the present application, referring to FIG. 4 , FIG. 7 and FIG. 8 , the battery 100 further includes a busbar component, which is welded to the electrode terminal 123 to form a second weld mark, and the central axis of the first through hole 1281 passes through the second weld mark.

[0205] The busbar assembly is welded to the electrode terminal 123 to form a second weld mark, with the central axis of the first through-hole 1281 passing through the second weld mark. This means that the busbar assembly is directly electrically connected to the electrode terminal 123 without the need for connecting via a connector such as a rivet block. This reduces the risk of poor overcurrent stability of the battery cell 12 due to excessive contact resistance caused by excessive connecting surfaces.

[0206] Battery 100 also includes a current collector, which is welded to electrode terminal 123 to form a second weld mark. The central axis of first through-hole 1281 passes through the second weld mark. This design allows for direct electrical connection between electrode terminal 123 and current collector, improving the overcurrent stability of battery cell 12.

[0207] According to some embodiments of the present application, the present application provides an electrical device, including the battery 100 described in any of the above solutions, and the battery 100 is used to provide electrical energy.

[0208] According to some embodiments of the present application, with reference to FIG4-7 , a battery cell 12 is provided, comprising a housing 121, an electrode terminal 123, and a fixing member 125. The housing 121 comprises a first wall 128, which is provided with a first through-hole 1281. The electrode terminal 123 comprises a main body 1231 and a stepped portion 1232. At least a portion of the main body 1231 is inserted through the first through-hole 1281. The stepped portion 1232 is integrally formed with the main body 1231, protruding from the outer circumference of the main body 1231 and located outside the first wall 128. The fixing member 125 is provided with a second through-hole 1251 for the main body 1231 to pass through. In the thickness direction of the first wall 128, at least a portion of the fixing member 125 is located between the first wall 128 and the stepped portion 1232 and abuts against the stepped portion 1232. In the thickness direction of the first wall 128, the main body 1231 has a first end surface 12311 facing away from the interior of the housing 121. The fixing member 125 has a second end surface 1252 facing away from the first wall 128, with the first end surface 12311 extending beyond the second end surface 1252. The yield strength of the fixing member 125 is greater than that of the electrode terminal 123. A first groove 1234 extending along the circumference of the main body 1231 is formed at the edge of the first end surface 12311. The stepped portion 1232 has a fourth end surface facing away from the first wall 128, which is coplanar with the bottom surface of the first groove 1234. In the radial direction of the main body 1231, the fixing member 125 extends beyond the outer circumference of the stepped portion 1232.

[0209] The electrode terminal 123 further includes a limiting portion 1233 , which protrudes from the outer circumference of the main body 1231 and is located inside the first wall 128 . The limiting portion 1233 is used to limit the movement of the electrode terminal 123 toward the outside of the housing 121 .

[0210] The battery cell 12 also includes a first insulating member 126, which includes a main body 1261 and a first extension 1262. The main body 1261 is located between the fixing member 125 and the first wall 128. The main body 1261 is provided with a third through-hole 12611, through which the supply terminal 123 passes. The first extension 1262 is located on the periphery of the fixing member 125 and surrounds the edge of the main body 1261. The outer surface of the first wall 128 is provided with a second groove 1282, within which the main body 1261 is located. The end of the first extension 1262 extends out of the second groove 1282 in the thickness direction of the first wall 128.

[0211] The battery cell 12 further includes a sealing member 127 , which is at least partially located between the first wall 128 and the limiting portion 1233 .

[0212] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, wherein: include: The housing comprises a first wall, wherein the first wall is provided with a first through hole; An electrode terminal, comprising a main body and a step portion, wherein at least a portion of the main body is inserted into the first through hole, the step portion is integrally formed with the main body, the step portion protrudes from an outer peripheral surface of the main body, and the step portion is located outside the first wall; A fixing member, made of metal, provided with a second through hole for the main body to pass through, and at least a portion of the fixing member is located between the first wall and the step portion and abuts against the step portion in the thickness direction of the first wall; Wherein, in the thickness direction of the first wall, the main body has a first end surface facing away from the interior of the shell, the fixing member has a second end surface facing away from the first wall, and the first end surface exceeds the second end surface.

2. The battery cell according to claim 1, wherein: The yield strength of the fixing member is greater than the yield strength of the electrode terminal.

3. The battery cell according to claim 2, wherein: The yield strength of the fixing member is σs1, and the yield strength of the electrode terminal is σs2, satisfying: 1.1≤σs1 / σs2≤10.

4. The battery cell according to claim 3, wherein: 3≤σs1 / σs2≤5.

5. The battery cell according to any one of claims 2 to 3, wherein: 205Mpa≤σs1≤250Mpa, 40Mpa≤σs2≤55Mpa.

6. The battery cell according to any one of claims 1 to 5, wherein: In the thickness direction of the first wall, the height difference between the first end surface and the second end surface is D, the thickness of the step portion is t, and the following conditions are satisfied: 1.1≤D / t≤6.

7. The battery cell according to claim 6, wherein: 0.5mm≤D≤3mm, 0.5mm≤t≤2.5mm.

8. The battery cell according to any one of claims 1 to 7, wherein: In the radial direction of the main body, the fixing member exceeds the outer peripheral surface of the step portion.

9. The battery cell according to any one of claims 1 to 8, wherein: In the radial direction of the main body, a projection of the fixing member at least partially overlaps with a projection of the step portion.

10. The battery cell according to claim 9, wherein: At least a portion of the step portion is received in the second through hole.

11. The battery cell according to claim 10, wherein: The diameter of the second through hole gradually decreases in a direction approaching the first wall, and the step portion abuts against the hole wall of the second through hole.

12. The battery cell according to any one of claims 9 to 11, wherein: The step portion has a third end surface facing away from the first wall, and in the thickness direction of the first wall, the second end surface exceeds the third end surface or is flush with the third end surface.

13. The battery cell according to any one of claims 1 to 12, wherein: In the radial direction of the main body, the dimension of the step portion protruding from the outer peripheral surface of the main body is W1, and 0.1 mm≤W1≤5 mm.

14. The battery cell according to any one of claims 1 to 13, wherein: A first groove extending along the circumference of the main body is provided at an edge of the first end surface, and the step portion has a fourth end surface facing away from the first wall, and the fourth end surface is coplanar with a bottom surface of the first groove.

15. The battery cell according to claim 14, wherein: In the radial direction of the main body, the distance between the side surface of the first groove and the outer peripheral surface of the step portion is W2, which satisfies: 0.5mm≤W2≤10mm.

16. The battery cell according to any one of claims 14 to 15, wherein: The groove depth of the first groove is T, which satisfies: 0.1 mm≤T≤5 mm.

17. The battery cell according to any one of claims 1 to 16, wherein: The material of the fixing member includes steel, and the material of the electrode terminal includes aluminum or a copper-aluminum composite material.

18. The battery cell according to any one of claims 1 to 16, wherein: The battery cell further includes a first insulating member, at least a portion of which is disposed between the fixing member and the first wall.

19. The battery cell according to claim 18, wherein: The first insulating member includes a main body and a first extension portion, wherein the main body is located between the fixing member and the first wall, the main body is provided with a third through hole for the electrode terminal to pass through, and the first extension portion is located at the periphery of the fixing member and is arranged around the edge of the main body.

20. The battery cell according to claim 19, wherein: A second groove is provided on the outer surface of the first wall, and the body is located in the second groove.

21. The battery cell according to claim 20, wherein: In the thickness direction of the first wall, an end portion of the first extension portion protrudes out of the second groove.

22. The battery cell according to any one of claims 19 to 21, wherein: The first insulating member further includes a second extension portion, the second extension portion is disposed around the third through hole, one end of the second extension portion is connected to the main body portion, and the other end of the second extension portion extends toward a direction close to the main body.

23. The battery cell according to any one of claims 1 to 22, wherein: The electrode terminal further includes a limiting portion, which protrudes from the outer peripheral surface of the main body and is located on the inner side of the first wall. The limiting portion is used to limit the movement of the electrode terminal toward the outside of the shell.

24. The battery cell according to claim 23, wherein: The battery cell further includes a sealing member, wherein the sealing member is at least partially located between the first wall and the limiting portion.

25. The battery cell according to any one of claims 1 to 24, wherein: The battery cell further includes an electrode assembly and a converter. The electrode assembly is disposed inside the housing. The converter connects the electrode terminal and the electrode assembly. The electrode terminal is provided with a positioning portion for positioning the converter.

26. The battery cell according to claim 25, wherein: The adapter is provided with a positioning matching portion, and the positioning matching portion cooperates with the positioning portion.

27. The battery cell according to claim 26, wherein: One of the positioning portion and the positioning matching portion includes a positioning groove, and the other includes a positioning protrusion.

28. The battery cell according to any one of claims 25 to 27, wherein: Along the thickness direction of the first wall, the electrode terminal has a first surface facing the electrode assembly, and a third groove is formed on the first surface; The adapter and the electrode terminal are welded to form a first weld mark, and along the thickness direction of the first wall, the first weld mark does not overlap with the third groove.

29. The battery cell according to claim 28, wherein: The first weld mark is arranged around the third groove.

30. The battery cell according to any one of claims 1 to 29, wherein: The housing comprises: The housing comprises a bottom wall and a side wall surrounding the bottom wall, wherein one end of the side wall is connected to the bottom wall and the other end forms an opening; An end cover, used to cover the opening; Wherein, the first wall is the end cover or the bottom wall.

31. A battery, wherein: The invention comprises a battery cell as claimed in any one of claims 1 to 30.

32. The battery according to claim 31, wherein The battery further includes a busbar component, the busbar component is welded to the electrode terminal to form a second weld mark, and the central axis of the first through hole passes through the second weld mark.

33. An electrical device, wherein: The electrical device comprises a battery cell as described in any one of claims 1 to 30, and the battery cell is used to provide electrical energy; or the electrical device comprises a battery as described in any one of claims 31 to 32, and the battery is used to provide electrical energy.

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