Battery cell, battery, and electrical device

Abstract

The present application relates to the field of batteries, and provides a battery cell (10), a battery (1), and an electrical device. The battery cell (10) comprises a casing (11), an electrode assembly (15), and electrode terminals (12). The casing (11) comprises a first wall (113). The electrode assembly (15) is accommodated in the casing (11). Each electrode terminal (12) comprises a terminal body (121) and a reinforcing member (122). The terminal body (121) is arranged on the first wall (113) and electrically connected to the electrode assembly (15). The reinforcing member (122) is connected to the end of the terminal body (121) along the thickness direction of the terminal body (121). On the basis of the described structure, the electrode terminals (12) can achieve better structural strength, so that the risk of cracking of the electrode terminals (12) due to stress concentration and poor structural strength can be reduced, and the service life of the electrode terminals (12) and the battery cell (10) can be prolonged.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number 202311118924.7 and invention name “Battery Cell, Battery and Electrical Device” filed with the State Intellectual Property Office of the People’s Republic of China on August 31, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The embodiments of the present application relate to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] In some cases, battery cells include end caps and electrode terminals mounted on the end caps. During the battery cell's life, the electrode terminals are subject to continuous deformation and internal stress. However, the structural strength of the electrode terminals is generally poor.

[0005] Application Contents

[0006] The embodiments of the present application provide a battery cell, a battery, and an electrical device, aiming to solve the problem of generally poor structural strength of electrode terminals.

[0007] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are:

[0008] In a first aspect, a battery cell is provided, comprising:

[0009] a housing comprising a first wall;

[0010] an electrode assembly housed in the housing;

[0011] The electrode terminal includes a terminal body and a reinforcement piece. The terminal body is arranged on the first wall and is electrically connected to the electrode assembly. The reinforcement piece is connected to one end of the terminal body along the thickness direction of the terminal body.

[0012] The battery cell provided in the embodiments of the present application can include at least one electrode terminal comprising a terminal body and a reinforcement member. Based on this, the electrode terminal can be electrically connected to the electrode assembly via the terminal body mounted on the first wall, thereby enabling the output or input of electrical energy. The electrode terminal can also be connected to one end of the terminal body along the thickness direction of the terminal body via a reinforcement member to reinforce the terminal body, thereby ensuring and enhancing the combined structural strength of the terminal body and the reinforcement member. Based on this, the composite structure of the terminal body and reinforcement member can achieve improved structural strength, ensuring that the electrode terminal meets processing and assembly requirements and can withstand deformational internal stress during the use of the battery cell. This reduces the risk of cracking in the electrode terminal due to stress concentration and poor structural strength, thereby ensuring and extending the service life of the electrode terminal and the battery cell. Furthermore, while achieving improved structural strength, the composite structure of the terminal body and reinforcement member can also reduce the increase in thickness of the electrode terminal, thereby reducing the negative impact on the volumetric energy density of the battery cell.

[0013] In some embodiments, the reinforcement piece is connected to an end of the terminal body close to the electrode assembly.

[0014] By adopting the above solution, the reinforcing piece can be connected to one end of the terminal body close to the electrode assembly, so that the portion of the terminal body located within the shell can be reinforced through the reinforcing piece. Based on this, the comprehensive structural strength of the portion of the electrode terminal located within the shell can be guaranteed and enhanced, so that the portion of the electrode terminal located within the shell has better comprehensive structural strength, can be processed to reliably match the first wall, can establish a reliable electrical connection with the electrode assembly, can withstand deformation internal stress during the use of the battery cell, and is not prone to cracking due to stress concentration and poor structural strength. Moreover, on this basis, it is also beneficial to reduce the increase in the thickness of the portion of the electrode terminal located within the shell, thereby limiting the space occupied by the electrode terminal within the shell and reducing the negative impact on the volume energy density of the battery cell.

[0015] In some embodiments, the reinforcement piece is connected to the end surface of the terminal body close to the electrode assembly.

[0016] By adopting the above solution, by connecting the reinforcing member to the end face of the terminal body near the electrode assembly, the connection convenience and reliability between the reinforcing member and the terminal body can be improved. Furthermore, the area of ​​the reinforcing member on the end face of the terminal body near the electrode assembly can be guaranteed, ensuring that the reinforcing member can provide large-scale, more balanced, and more effective reinforcement to the portion of the terminal body located within the housing. This helps to ensure and enhance the overall structural strength of the portion of the electrode terminal located within the housing, and can also help to evenly reduce the increase in the thickness of the portion of the electrode terminal located within the housing, thereby evenly constraining the space occupied by the electrode terminal within the housing and reducing the negative impact on the volumetric energy density of the battery cell.

[0017] In some embodiments, the reinforcement is provided with a through hole, which penetrates the reinforcement along the thickness direction of the reinforcement, and at least a portion of the terminal body is exposed through the through hole and is electrically connected to the electrode assembly.

[0018] By adopting the above solution, a through-hole can be provided in the reinforcing member, so that at least a portion of the terminal body can be exposed through the through-hole and electrically connected to the electrode assembly. Based on this, it is possible to facilitate the establishment of an electrical connection between the terminal body and the electrode assembly through the reinforcing member, thereby reducing the impact of the reinforcing member on the flow capacity between the terminal body and the electrode assembly, and thus helping to ensure and improve the flow capacity between the terminal body and the electrode assembly.

[0019] In some embodiments, the through hole is located in the middle of the reinforcement member.

[0020] By adopting the above solution, when the reinforcing member is connected to the end face of the terminal body near the electrode assembly, the through hole is provided in the middle of the reinforcing member. This allows the middle region of the end face of the terminal body near the electrode assembly to be exposed through the through hole and electrically connected to the electrode assembly. Based on this, the middle region of the end face of the terminal body can be easily connected to the electrode assembly through the reinforcing member, thereby ensuring and improving the connection convenience and reliability between the terminal body and the electrode assembly, and optimizing the flow path and flow capacity between the terminal body and the electrode assembly.

[0021] In some embodiments, a mounting hole is formed through the first wall, and the terminal body is mounted in the mounting hole;

[0022] Along the thickness direction of the reinforcement, the projection of the through hole is located inside the projection of the mounting hole.

[0023] By adopting this solution, the projection of the through-hole along the thickness direction of the reinforcement member falls within the projection of the mounting hole along the thickness direction of the reinforcement member, ensuring that the through-hole's placement range does not exceed the placement range of the mounting hole. This ensures that the through-hole is not located in the area of ​​the reinforcement member corresponding to the junction of the terminal body and the mounting hole, allowing the reinforcement member to reliably reinforce the junction between the terminal body and the mounting hole. This ensures and improves the overall structural strength of the junction between the electrode terminal and the mounting hole, reduces the risk of cracking in the junction area due to stress concentration and poor structural strength, and ensures and extends the service life of the battery cell.

[0024] In some embodiments, a groove is provided at one end of the terminal body away from the electrode assembly;

[0025] Along the thickness direction of the reinforcing member, the projection of the groove is located inside the projection of the through hole.

[0026] By adopting the above solution, by providing a groove at the end of the terminal body away from the electrode assembly, on the one hand, an operating space can be formed through the groove, so that the connection operation of the groove bottom can be performed from the outside of the terminal body, thereby facilitating a convenient and reliable electrical connection between the groove bottom and the electrode assembly. On the other hand, the groove can reduce the material cost of the terminal body and the electrode terminal, and reduce the weight of the terminal body and the electrode terminal, thereby reducing the cost of the battery cell and improving the weight energy density of the battery cell.

[0027] By adopting this solution, by ensuring that the projection of the groove along the thickness of the reinforcement falls within the projection of the through-hole along the thickness of the reinforcement, the through-hole's placement range is ensured to be no smaller than the groove's placement range. This ensures that the through-hole avoids the bottom portion of the groove and the primary portion of the electrical connection between the terminal body and the electrode assembly. This ensures and improves the ease of connection between the terminal body and the electrode assembly, particularly by reducing the risk of portions of the reinforcement being incorporated into the weld during welding to achieve electrical connection between the terminal body and the electrode assembly, forming impurities and thus affecting weld quality and current carrying capacity.

[0028] In some embodiments, the battery cell includes a transition piece, which is used to electrically connect the electrode assembly and the terminal body, and the transition piece is connected to the terminal body via a portion exposed by the through hole.

[0029] By adopting the above solution, the adapter can be electrically connected to the electrode assembly and to the portion of the terminal body exposed through the through-hole, thereby establishing a stable and reliable electrical connection between the electrode assembly and the terminal body. Based on this, the adapter can be used to collect and pass current between the electrode assembly and the terminal body. Moreover, because the adapter is directly connected to the portion of the terminal body exposed through the through-hole, bypassing the reinforcement, it can also effectively reduce the impact of the reinforcement on the flow capacity between the terminal body and the adapter. This can help to ensure and improve the flow capacity between the terminal body and the electrode assembly.

[0030] In some embodiments, the adapter includes an adapter body and a first protrusion disposed on the adapter body, and the first protrusion passes through the through hole and is connected to the terminal body.

[0031] By adopting the above solution, the adapter can conveniently and reliably electrically connect to the tab of the electrode assembly through the adapter body, thereby ensuring and improving the connection convenience, connection reliability, and flow capacity between the adapter and the electrode assembly. The adapter can also precisely align and penetrate the through-hole through the first protrusion provided on the adapter body, so as to pass over the reinforcement and reliably electrically connect to the portion of the terminal body exposed through the through-hole, thereby ensuring and improving the connection convenience, connection reliability, and flow capacity between the adapter and the terminal body.

[0032] In addition, the adapter can combine the thickness of the first protrusion and the part of the adapter body corresponding to the first protrusion to ensure that the adapter has sufficient thickness to be connected to the terminal body, thereby ensuring that a reliable and effective connection can be established between the adapter and the terminal body, ensuring and expanding the effective melting depth between the adapter and the terminal body, and reducing the risk of burnt membranes, cold welds and other phenomena.

[0033] On the basis that the combined thickness of the first protrusion and the portion of the adapter body corresponding to the first protrusion can meet the above requirements, the adapter body can be thinned accordingly, and at least a portion of the first protrusion can be inserted into the through-hole, so that at least a portion of the first protrusion can share space with the reinforcement in the thickness direction of the reinforcement. Based on this, the additional space occupied by the adapter on the side of the reinforcement away from the terminal body can be effectively reduced, and the combined space occupied by the adapter and electrode terminal within the housing can be effectively reduced, thereby helping to increase the volumetric energy density of the battery cell.

[0034] In some embodiments, a portion of the terminal body exposed through the through hole is provided with a second protrusion, and the second protrusion passes through the through hole and is connected to the adapter.

[0035] By adopting the above solution, the terminal body can be precisely positioned and penetrated into the through hole through the second protrusion, so as to pass over the reinforcement piece and be reliably electrically connected to the part of the corresponding through hole of the adapter, thereby ensuring and improving the connection convenience, connection reliability and current carrying capacity between the terminal body and the adapter.

[0036] Moreover, based on the setting of the second protrusion, it can be ensured that there is sufficient connection thickness between the terminal body and the adapter in the area corresponding to the second protrusion, thereby ensuring that a reliable and effective connection can be established between the terminal body and the adapter, ensuring and expanding the effective melting depth between the terminal body and the adapter, and reducing the risk of burnt diaphragms, cold welds and the like.

[0037] Given that the area corresponding to the second protrusion has sufficient connection thickness to meet connection strength requirements, the adapter can be thinned accordingly. This effectively reduces the additional space occupied by the adapter on the side of the reinforcement away from the terminal body. Furthermore, because at least a portion of the second protrusion is inserted through the through-hole, at least a portion of the second protrusion can share space with the reinforcement along its thickness. This effectively reduces the combined space occupied by the adapter and electrode terminal within the housing, thereby improving the volumetric energy density of the battery cell.

[0038] In some embodiments, the adapter abuts against a side surface of the reinforcement member away from the terminal body.

[0039] By adopting the above solution, the adapter can be made to abut against the side of the reinforcement away from the terminal body to compress the gap space between the adapter and the reinforcement, thereby greatly compressing the combined space occupied by the adapter and the electrode terminal in the casing, thereby ensuring and improving the volume energy density of the battery cell.

[0040] In some embodiments, the adapter is connected to the tab of the electrode assembly to form a connection mark;

[0041] Along the thickness direction of the reinforcing member, the projection of the reinforcing member and the projection of the connecting mark at least partially overlap.

[0042] By adopting the above solution, by ensuring that the projection of the reinforcing member along the thickness direction of the reinforcing member at least partially overlaps with the projection of the connection mark along the thickness direction of the reinforcing member, the reinforcing member can reliably reinforce the portion of the terminal body corresponding to the connection mark. Based on this, during the use of the battery cell, especially when the electrode assembly shakes and impacts the terminal body through the connection mark, the reinforcing member's reinforcement effect on the portion of the terminal body corresponding to the connection mark effectively reduces the risk of damage to the terminal body due to impact, thereby ensuring and improving the reliability of the battery cell and ensuring and extending the service life of the electrode terminal and battery cell.

[0043] In some embodiments, the first wall has a mounting hole extending therethrough;

[0044] The terminal body includes a main body, a first flange and a second flange. The main body is passed through the mounting hole. The first flange and the second flange are arranged at opposite ends of the main body. The first flange and the second flange cooperate to clamp the first wall.

[0045] By adopting the above solution, the terminal body can be inserted into the mounting hole through the main body, and the first flange portion and the second flange portion, respectively provided at opposite ends of the main body, cooperate and jointly clamp the first wall to achieve a stable installation in the mounting hole. Based on this, the installation reliability between the terminal body and the mounting hole can be effectively improved, and the terminal body can be effectively prevented from being separated from the mounting hole, thereby ensuring and improving the assembly reliability between the electrode terminal and the first wall, and ensuring and improving the structural reliability of the battery cell.

[0046] In some embodiments, the main body portion, the first flange portion, and the second flange portion are integrally formed.

[0047] By adopting the above-mentioned scheme, by integrally arranging the main body, the first flange portion and the second flange portion, the processing and forming of the terminal body can be facilitated, and the structural reliability of the terminal body can be improved, and the assembly convenience and assembly reliability between the terminal body and the mounting hole can be improved.

[0048] In some embodiments, a groove is provided at one end of the main body away from the electrode assembly.

[0049] By adopting the above solution, by providing a groove at the end of the main body away from the electrode assembly, on the one hand, an operating space can be formed through the groove, so that the bottom of the groove can be connected from the outside of the main body, thereby facilitating a convenient and reliable electrical connection between the bottom of the groove and the electrode assembly. On the other hand, the groove can reduce the material cost of the main body and electrode terminals, and reduce the weight of the main body and electrode terminals, thereby reducing the cost of the battery cell and improving the weight energy density of the battery cell.

[0050] In some embodiments, the structural strength of the reinforcement is greater than the structural strength of the terminal body.

[0051] By adopting the above solution, by making the structural strength of the reinforcement piece greater than the structural strength of the terminal body, on the one hand, the reinforcing effect of the reinforcement piece on the terminal body can be guaranteed and improved, and the electrode terminal can be enabled to achieve better structural strength through the composite structure of the terminal body and the reinforcement piece, thereby ensuring that the electrode terminal can meet processing and assembly requirements, and can ensure that the electrode terminal can withstand deformation internal stress during the use of the battery cell, and can reduce the risk of cracking of the electrode terminal due to stress concentration and poor structural strength, and can ensure and extend the service life of the electrode terminal and the battery cell.

[0052] On the other hand, this allows the electrode terminal to achieve better structural strength with a thinner thickness, facilitating a reduction in the thickness of the electrode terminal. Furthermore, as the ratio of the structural strength of the reinforcing member to the structural strength of the terminal body increases, the reinforcing member provides greater reinforcement to the terminal body per unit thickness, allowing the terminal body and, consequently, the electrode terminal to be thinned further. This effectively reduces the thickness of the electrode terminal, correspondingly reducing the space occupied by the electrode terminal in the battery cell, thereby improving the volumetric energy density of the battery cell.

[0053] In a second aspect, a battery is provided, which includes the battery cell provided in the embodiments of the present application.

[0054] By adopting the above solution, the battery can improve the volume energy density and space utilization of the battery by applying the battery cells provided in the embodiments of the present application.

[0055] In a third aspect, an electrical device is provided, which includes the battery provided in an embodiment of the present application, or the battery cell provided in an embodiment of the present application.

[0056] By adopting the above solution, the electrical device can ensure and improve the performance of the electrical device by applying the battery or battery cell provided in the embodiment of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0058] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0059] FIG2 is an exploded schematic diagram of a battery provided in some embodiments of the present application;

[0060] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0061] FIG4 is a front view of the battery cell provided in FIG3 ;

[0062] FIG5 is a cross-sectional view taken along AA provided in FIG4 ;

[0063] FIG6 is an enlarged view of area B provided in FIG5 ;

[0064] FIG7 is a cross-sectional view of an electrode terminal provided in some embodiments of the present application;

[0065] FIG8 is a schematic structural diagram of an adapter provided in some embodiments of the present application;

[0066] FIG9 is a cross-sectional view of the adapter provided in FIG8 ;

[0067] FIG10 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application, wherein the portion of the terminal body exposed through the through hole is provided with a second protrusion, which passes through the through hole and is connected to the adapter.

[0068] In the figures, the reference numerals are: 1-battery, 2-controller, 3-motor; 100-battery unit, 200-housing, 201-first part, 202-second part; 10-battery cell, 11-housing, 111-housing, 112-end cover, 113-first wall, 1131-mounting hole; 12-electrode terminal, 12a-positive electrode terminal, 12b-negative electrode terminal, 121-terminal body, 1211-groove, 1212-liquid injection hole, 1213-main body, 1214-first flange, 1215-second flange, 1216-second convex portion; 122-reinforcement member, 1221-through hole; 13-adapter, 13a-positive electrode adapter, 13b-negative electrode adapter, 131-adapter body, 132-first convex portion, 133-connecting stamp; 14-insulating structure; 15-electrode assembly, 151-electrode body, 152-tab, 152a-positive electrode tab, 152b-negative electrode tab. DETAILED DESCRIPTION

[0069] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clear and understandable, the present application is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0070] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", 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 this 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 this application.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or at least two of such features. In the description of this application, "at least two" means two or more, unless otherwise specifically defined.

[0072] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0073] A battery cell is the smallest unit that stores and outputs electrical energy. In some cases, a battery cell includes an end cap and an electrode terminal, with the electrode terminal mounted on the end cap. The end cap, along with other components, creates the internal environment of the battery cell, isolating it from the external environment. The electrode terminal is stably mounted on the end cap and can be used to output or input electrical energy.

[0074] Because electrode terminals are constantly subjected to deformational internal stress during the use of battery cells, they are generally required to have strong structural strength. The structural strength of electrode terminals can be enhanced by increasing their thickness, where the thickness of the electrode terminals refers to the dimension of the electrode terminals in the thickness direction of the electrode terminals. However, as the thickness of the electrode terminals increases, the volumetric energy density of the battery cells decreases. Therefore, to ensure the volumetric energy density of the battery cells, the thickness and structural strength of the electrode terminals must be carefully considered. As a result, the structural strength of the electrode terminals of existing battery cells is generally poor.

[0075] Thus, some embodiments of the present application provide a battery cell in which at least one electrode terminal includes a terminal body and a reinforcement member. Based on this, the electrode terminal can be electrically connected to the electrode assembly via the terminal body mounted on the first wall, enabling electrical energy to be output or input. The electrode terminal can also be connected to one end of the terminal body along the thickness direction of the terminal body via the reinforcement member to reinforce the terminal body, thereby ensuring and enhancing the combined structural strength of the terminal body and the reinforcement member. Based on this, the composite structure of the terminal body and reinforcement member can achieve improved structural strength, ensuring that the electrode terminal meets processing and assembly requirements and can withstand deformational internal stress during battery cell use. This reduces the risk of cracking in the electrode terminal due to stress concentration and poor structural strength, thereby ensuring and extending the service life of the electrode terminal and the battery cell. Furthermore, while achieving improved structural strength, the composite structure of the terminal body and reinforcement member can also reduce the increase in thickness of the electrode terminal, thereby reducing the negative impact on the volumetric energy density of the battery cell.

[0076] The battery cells disclosed in the embodiments of this application can be lithium-ion secondary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, magnesium-ion battery cells, etc. The battery cells can be cylindrical, flat, rectangular, or other shapes. The battery cells can be packaged in various ways to form cylindrical battery cells, prismatic battery cells, or soft-pack battery cells, etc.

[0077] The battery cells disclosed in the embodiments of the present application can be used independently or in combination with other battery cells to form modular batteries that can provide higher voltage and capacity, such as battery modules, battery packs or battery packs.

[0078] The battery cells and batteries disclosed in the embodiments of the present application can be used in electrical devices that use battery cells or batteries as power sources, or in various energy storage systems that use battery cells or batteries as energy storage elements. The electrical devices may be, but are not limited to, vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0079] In order to illustrate the technical solution provided by the present application, the following is a detailed description with reference to specific drawings and embodiments, taking "the electrical device being a vehicle" as an example.

[0080] Please refer to Figure 1, which is a schematic structural diagram of a vehicle provided in some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1 is provided inside the vehicle, and the battery 1 can be provided at the bottom, head or tail of the vehicle. The battery 1 is used to power the vehicle. For example, the battery 1 can be used as an operating power source for the vehicle. The vehicle may also include a controller 2 and a motor 3. The controller 2 is used to control the battery 1 to power the motor 3, for example, for starting, navigating and operating power requirements during driving of the vehicle.

[0081] In some embodiments of the present application, the battery 1 can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0082] Please refer to Figure 2, which is an exploded schematic diagram of a battery 1 provided in some embodiments of the present application. The battery 1 includes a battery cell 100 and a housing 200, with the battery cell 100 housed within the housing 200. The housing 200 is used to provide a storage space for the battery cell 100 and can have various structures. In some embodiments, the housing 200 can include a first portion 201 and a second portion 202, which overlap with each other and together define a storage space for the battery cell 100. The second portion 202 can be a hollow structure with one end open, and the first portion 201 can be a plate-like structure, with the first portion 201 overlapping the open side of the second portion 202, so that the first portion 201 and the second portion 202 jointly define a storage space. Alternatively, the first portion 201 and the second portion 202 can each be a hollow structure with one end open, with the open side of the first portion 201 overlapping the open side of the second portion 202. Of course, the box body 200 formed by the first part 201 and the second part 202 can be in various shapes, such as a cylinder, a cuboid, etc.

[0083] In the battery 1 , there may be at least two battery cells 100 , and the at least two battery cells 100 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the at least two battery cells 100 are connected in series and in parallel.

[0084] Specifically, the battery unit 100 can be a battery cell 10 (as shown in FIG3 ). At least two battery cells 10 can be directly connected in series, in parallel, or mixed together, and then the whole formed by at least two battery cells 10 is accommodated in the box body 200. Among them, the battery cell 10 can be a lithium-ion secondary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc. The battery cell 10 can be cylindrical, flat, rectangular, or other shapes, etc. The battery cell 10 can be packaged in different ways to form a cylindrical battery cell, a square battery cell, or a soft-pack battery cell, etc.

[0085] Alternatively, the battery unit 100 may be a battery module or battery assembly. At least two battery cells 10 may be connected in series, parallel, or in series to form a modular structure, i.e., a battery module or battery assembly. At least two battery modules or battery assembly may then be connected in series, parallel, or in series to form a whole, which is then housed in the housing 200.

[0086] Of course, the battery 1 may further include other structures. For example, the battery 1 may further include a busbar component (not shown in the figure) for achieving electrical connection between at least two battery cells 100 .

[0087] Of course, in some embodiments, the battery 1 may not include the box body 200 , but at least two battery cells 10 may be electrically connected and formed into a whole through necessary fixing structures before being assembled into an electrical device.

[0088] Please refer to Figures 3, 4, and 5. Figure 3 is a schematic diagram of the structure of a battery cell 10 provided in some embodiments of the present application. Figure 4 is a front view of the battery cell 10 provided in Figure 3. Figure 5 is a cross-sectional view along line AA provided in Figure 4. A battery cell 10 is the smallest unit for storing and outputting electrical energy. The battery cell 10 includes a housing 11, electrode terminals 12, an adapter 13, an electrode assembly 15, an electrolyte (not shown), and other components.

[0089] The outer shell 11 is a component that isolates the internal environment of the battery cell 10 from the external environment. The outer shell 11 may include a shell 111 and an end cover 112. The end cover 112 is a component that covers the opening of the shell 111 to isolate the internal environment of the battery cell 10 from the external environment. In some embodiments, the shape of the end cover 112 can be adapted to the shape of the shell 111 to match the shell 111. In some embodiments, the end cover 112 can be made of a material with a certain hardness and strength, so that the end cover 112 is not easily deformed when squeezed and collided, so that the battery cell 10 can have a higher structural strength and the safety performance can also be improved. Among them, the material of the end cover 112 can be diversified, and the end cover 112 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic and other materials.

[0090] The shell 111 is a component used to cooperate with the end cover 112 to form the internal environment of the battery cell 10. The internal environment formed by the shell 111 and the end cover 112 can be used to accommodate components such as the electrode assembly 15 and the electrolyte. In some embodiments, the shell 111 and the end cover 112 can be independent components, and an opening can be provided on the shell 111. The internal environment of the battery cell 10 is formed by covering the opening with the end cover 112. In some embodiments, the end cover 112 and the shell 111 can also be integrated. Specifically, the end cover 112 and the shell 111 can form a common connection surface before other components are put into the shell. When the interior of the shell 111 needs to be encapsulated, the end cover 112 is covered with the shell 111. Among them, the shell 111 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, a hexagonal prism, etc. The shape of the shell 111 can be determined according to the specific shape and size of the electrode assembly 15. The material of the housing 111 can be varied, and the housing 111 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and other materials.

[0091] The electrode assembly 15 is a component in the battery cell 10 where electrochemical reactions occur. The housing 11 may include one or at least two electrode assemblies 15. The electrode assembly 15 includes a positive electrode sheet (not shown in the figure), a negative electrode sheet (not shown in the figure) and a separator (not shown in the figure), which separates the positive electrode sheet from the negative electrode sheet. The positive electrode sheet, the separator and the negative electrode sheet can be processed by winding, stacking or other methods to form the electrode assembly 15. In the electrode assembly 15, the parts of the positive electrode sheet and the negative electrode sheet that have active materials constitute the electrode body 151 of the electrode assembly 15, and the parts of the positive electrode sheet and the negative electrode sheet that do not have active materials each constitute a tab 152, which is the current transmission end of the electrode assembly 15 and is used to transmit current. The tab 152 of the positive electrode sheet is the positive electrode tab 152a, and the tab 152 of the negative electrode sheet is the negative electrode tab 152b. The positive electrode tab 152a and the negative electrode tab 152b can be located together at one end of the electrode body 151 or respectively at both ends of the electrode body 151.

[0092] The electrolyte is the liquid that soaks the electrode assembly 15. The battery cell 10 mainly relies on the movement of active ions between the positive electrode plate and the negative electrode plate to work. When the battery cell 10 is charged, the positive electrode plate will generate active ions. The active ions provided by the positive electrode plate can penetrate the pores of the diaphragm, move to the negative electrode plate through the electrolyte, and embed into the negative active material of the negative electrode plate. Conversely, when the battery cell 10 is discharged, the active ions embedded in the negative active material of the negative electrode plate are released. The active ions released from the negative electrode plate can penetrate the pores of the diaphragm, move to the positive electrode plate through the electrolyte, and embed into the positive active material of the positive electrode plate. Among them, the active ions can be lithium ions, sodium ions, etc.

[0093] The electrode terminal 12 is a component that is electrically connected to the electrode assembly 15 and is used to output or input electrical energy. The electrode terminal 12 includes a positive electrode terminal 12a and a negative electrode terminal 12b. The positive electrode terminal 12a is electrically connected to the positive electrode tab 152a of the electrode assembly 15. The negative electrode terminal 12b is electrically connected to the negative electrode tab 152b of the electrode assembly 15. The electrode terminal 12 can be installed in the outer shell 11 and stabilize the installation position and installation state relative to the outer shell 11. In some embodiments, the electrode terminal 12 can be installed in the outer shell 11 by flanging and riveting. In some embodiments, an insulating structure 14 is provided in the area where the electrode terminal 12 and the outer shell 11 cooperate. The insulating structure 14 has insulating properties and can insulate the electrode terminal 12 and the outer shell 11 from each other to reduce the risk of short circuit. Optionally, the insulating structure 14 may include plastic, rubber, etc.

[0094] The adapter 13 is a current collecting component electrically connected between the tab 152 of the electrode assembly 15 and the corresponding electrode terminal 12. The adapter 13 can also be called a adapter connector, a current collecting plate or an adapter plate. The adapter 13 has conductive properties and is made of a conductive material. The material of the adapter 13 may include aluminum, aluminum alloy, copper, copper alloy, copper-aluminum alloy, etc. The adapter 13 includes a positive electrode adapter 13a and a negative electrode adapter 13b. The positive electrode tab 152a of the electrode assembly 15 can be electrically connected to the positive electrode terminal 12a through the positive electrode adapter 13a, and the negative electrode tab 152b of the electrode assembly 15 can be electrically connected to the negative electrode terminal 12b through the negative electrode adapter 13b to form a current loop. In some embodiments, the adapter 13 can be connected to the tab 152 of the electrode assembly 15 by welding, abutment, etc. The adapter 13 can be connected to the electrode terminal 12 by welding, abutment, etc. The shape of the adapter 13 can be various, such as square, round, special-shaped, etc.

[0095] In some embodiments, the housing 11 may further be provided with a pressure relief mechanism (not shown in the figures) for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value.

[0096] Referring to Figures 3, 5, and 6, some embodiments of the present application provide a battery cell 10, comprising a housing 11, an electrode assembly 15, and an electrode terminal 12. The housing 11 comprises a first wall 113. The electrode assembly 15 is housed within the housing 11. The electrode terminal 12 comprises a terminal body 121 and a reinforcement 122. The terminal body 121 is disposed on the first wall 113 and is electrically connected to the electrode assembly 15. The reinforcement 122 is connected to one end of the terminal body 121 along the thickness direction of the terminal body 121.

[0097] It should be noted that the housing 11 is a component that isolates the internal environment of the battery cell 10 from the external environment. The first wall 113 is the wall portion of the housing 11 for mounting the electrode terminal 12. The first wall 113 can be the top wall, bottom wall, or side wall of the housing 11. In some embodiments, the housing 11 may include a shell 111 and an end cap 112. When the electrode terminal 12 is mounted on the end cap 112, the end cap 112 can serve as the first wall 113.

[0098] It should also be noted that the electrode assembly 15 is a component in the battery cell 10 where electrochemical reactions occur. The battery cell 10 may be provided with one or at least two electrode assemblies 15. The electrode assembly 15 may be accommodated in the internal space enclosed by the outer shell 11. The electrode assembly 15 includes a positive electrode sheet, a negative electrode sheet and a separator, and the separator separates the positive electrode sheet from the negative electrode sheet. The positive electrode sheet, the separator and the negative electrode sheet may be processed by winding, stacking or other methods to form the electrode assembly 15. In the electrode assembly 15, the portions of the positive electrode sheet and the negative electrode sheet that have active materials constitute the electrode body 151 of the electrode assembly 15, and the portions of the positive electrode sheet and the negative electrode sheet that do not have active materials each constitute a lug 152. The lug 152 is the current transmission end of the electrode assembly 15, which is used to transmit current. The tab 152 of the positive electrode sheet is the positive electrode tab 152a, and the tab 152 of the negative electrode sheet is the negative electrode tab 152b. The positive electrode tab 152a and the negative electrode tab 152b can be located together at one end of the electrode body 151 or respectively at both ends of the electrode body 151.

[0099] It should also be noted that the electrode terminal 12 is electrically connected to the electrode assembly 15 and is a component for outputting or inputting electrical energy. The electrode terminal 12 includes a terminal body 121 and a reinforcing member 122.

[0100] The terminal body 121 is a component with current-carrying capacity and primarily functions as an electrical energy transmission component. The terminal body 121 is mounted to the first wall 113 and maintains a stable mounting position and state relative to the first wall 113. In some embodiments, the terminal body 121 can be mounted to the first wall 113 by riveting. The terminal body 121 is electrically connected to the tab 152 of the electrode assembly 15. The terminal body 121 can be electrically connected to the tab 152 of the electrode assembly 15 directly or through another component with current-carrying capacity. The "other component with current-carrying capacity" can be a reinforcement member 122 with current-carrying capacity or an adapter member 13 that can serve as a current collecting component. Of course, the reinforcement member 122 does not have to have current-carrying capacity. For example, in some embodiments, the reinforcement member 122 does not have current-carrying capacity, and the tab 152 of the electrode assembly 15 is electrically connected to the terminal body 121 through the adapter member 13.

[0101] The reinforcement piece 122 is a component used to reinforce the terminal body 121 to enhance the combined structural strength of the terminal body 121 and the reinforcement piece 122. The electrode terminal 12 provided with the reinforcement piece 122 can be the positive electrode terminal 12a or the negative electrode terminal 12b. The material of the reinforcement piece 122 can be selected according to the material of the terminal body 121, as long as it can ensure that the reinforcement piece 122 can reinforce the terminal body 121. In the case where both the positive electrode terminal 12a and the negative electrode terminal 12b are provided with the reinforcement piece 122, the reinforcement piece 122 of the positive electrode terminal 12a and the reinforcement piece 122 of the negative electrode terminal 12b can be made of the same material, or different materials can be used for their respective terminal bodies 121.

[0102] The reinforcement 122 is connected to one end of the terminal body 121 along the thickness direction of the terminal body 121. That is, along the thickness direction of the terminal body 121, the reinforcement 122 can be connected to the end of the terminal body 121 located inside the shell 11, or it can be connected to the end of the terminal body 121 located outside the shell 11. When the reinforcement 122 is connected to the end of the terminal body 121 located inside the shell 11, since the reinforcement 122 is arranged inside the shell 11 and will be soaked by the electrolyte, the reinforcement 122 needs to have the characteristic of being resistant to electrolyte corrosion. Among them, the connection method between the reinforcement 122 and the terminal body 121 can be but is not limited to welding, bonding, etc. Among them, the thickness direction of the terminal body 121 is parallel to the axial direction of the terminal body 121, that is, parallel to the extension direction of the central axis of the terminal body 121.

[0103] In summary, the battery cell 10 provided in the embodiment of the present application can include at least one electrode terminal 12 including a terminal body 121 and a reinforcing member 122. Based on this, the electrode terminal 12 can be electrically connected to the electrode assembly 15 via the terminal body 121 mounted on the first wall 113, thereby outputting or inputting electrical energy. The electrode terminal 12 can also be connected to one end of the terminal body 121 along the thickness direction of the terminal body 121 via the reinforcing member 122 to reinforce the terminal body 121, thereby ensuring and enhancing the combined structural strength of the terminal body 121 and the reinforcing member 122. Based on this, the electrode terminal 12 can achieve better structural strength through the composite structure of the terminal body 121 and the reinforcing member 122, ensuring that the electrode terminal 12 can meet processing and assembly requirements and can withstand deformation internal stress during the use of the battery cell 10. This can reduce the risk of cracking of the electrode terminal 12 due to stress concentration and poor structural strength, thereby ensuring and extending the service life of the electrode terminal 12 and the battery cell 10. Furthermore, while achieving improved structural strength, the composite structure of the terminal body 121 and the reinforcing member 122 can also reduce the increase in thickness of the electrode terminal 12, thereby reducing the negative impact on the volumetric energy density of the battery cell 10. The thickness of the electrode terminal 12 refers to the dimension of the electrode terminal 12 in the thickness direction of the terminal body 121.

[0104] Please refer to FIG. 5 , FIG. 6 , and FIG. 7 . In some embodiments of the present application, the reinforcing piece 122 is connected to one end of the terminal body 121 close to the electrode assembly 15 .

[0105] It should be noted that the reinforcing piece 122 is connected to the end of the terminal body 121 that is closest to the electrode assembly 15. That is, along the thickness direction of the terminal body 121, the reinforcing piece 122 is connected to the end of the terminal body 121 that is located inside the housing 11. Based on this, the reinforcing piece 122 can focus on reinforcing the portion of the terminal body 121 that is located inside the housing 11.

[0106] In this embodiment, the reinforcing member 122 may or may not have a current-carrying capacity. If the reinforcing member 122 has a current-carrying capacity, the electrode assembly 15 may be electrically connected to the terminal body 121 via the reinforcing member 122, or may bypass the reinforcing member 122 and electrically connect to the terminal body 121. If the reinforcing member 122 does not have a current-carrying capacity, the electrode assembly 15 may bypass the reinforcing member 122 and electrically connect to the terminal body 121.

[0107] By adopting the above solution, the reinforcing piece 122 can be connected to the end of the terminal body 121 near the electrode assembly 15, thereby specifically reinforcing the portion of the terminal body 121 located within the outer shell 11 via the reinforcing piece 122. This ensures and enhances the overall structural strength of the portion of the electrode terminal 12 located within the outer shell 11, ensuring that the portion of the electrode terminal 12 located within the outer shell 11 has excellent overall structural strength, can be processed to reliably mate with the first wall 113, can establish a reliable electrical connection with the electrode assembly 15, can withstand deformational internal stress during use of the battery cell 10, and is less likely to crack due to stress concentration and poor structural strength. Furthermore, this helps reduce the increase in the thickness of the portion of the electrode terminal 12 located within the outer shell 11, thereby limiting the space occupied by the electrode terminal 12 within the outer shell 11 and reducing the negative impact on the volumetric energy density of the battery cell 10.

[0108] Of course, in other embodiments, the reinforcing piece 122 may be connected to an end of the terminal body 121 away from the electrode assembly 15 .

[0109] Please refer to FIG. 5 , FIG. 6 , and FIG. 7 . In some embodiments of the present application, the reinforcing piece 122 is connected to the end surface of the terminal body 121 close to the electrode assembly 15 .

[0110] It should be noted that the reinforcing piece 122 is connected to the end of the terminal body 121 close to the electrode assembly 15, and in particular, to the end face of the terminal body 121. Based on this, the reinforcing piece 122 can reinforce the portion of the terminal body 121 located inside the housing 11 from the end face close to the electrode assembly 15 over a large area, in a more balanced and effective manner.

[0111] By adopting the above solution, by connecting the reinforcing piece 122 to the end face of the terminal body 121 near the electrode assembly 15, the connection convenience and reliability between the reinforcing piece 122 and the terminal body 121 can be improved. In addition, the installation area of ​​the reinforcing piece 122 on the end face of the terminal body 121 near the electrode assembly 15 can be guaranteed, so that the reinforcing piece 122 can provide large-area, more balanced, and more effective reinforcement to the portion of the terminal body 121 located within the outer shell 11. This can help to ensure and enhance the comprehensive structural strength of the portion of the electrode terminal 12 located within the outer shell 11, and can help to evenly reduce the increase in the thickness of the portion of the electrode terminal 12 located within the outer shell 11, thereby evenly constraining the space occupied by the electrode terminal 12 within the outer shell 11 and reducing the negative impact on the volume energy density of the battery cell 10.

[0112] Of course, in other embodiments, the reinforcing piece 122 may be connected to other locations such as the outer peripheral surface of one end of the terminal body 121 close to the electrode assembly 15 .

[0113] Please refer to Figures 5, 6, and 7. In some embodiments of the present application, the reinforcement 122 is provided with a through hole 1221, and the through hole 1221 penetrates the reinforcement 122 along the thickness direction of the reinforcement 122. At least part of the terminal body 121 is exposed through the through hole 1221 and is electrically connected to the electrode assembly 15.

[0114] It should be noted that a through hole 1221 may be provided in the reinforcement member 122, particularly when the reinforcement member 122 is connected to the end face of the terminal body 121 proximal to the electrode assembly 15. The through hole 1221 may extend through the reinforcement member 122 along its thickness direction, that is, it may extend through both opposite end faces of the reinforcement member 122 along its thickness direction. The thickness direction of the reinforcement member 122 is parallel to the central axis of the reinforcement member 122. As a result, at least a portion of the terminal body 121 may be exposed through the through hole 1221. In particular, the portion of the terminal body 121 corresponding to the through hole 1221 may be exposed through the through hole 1221 without being obstructed by the reinforcement member 122. This facilitates electrical connection between the terminal body 121 and the electrode assembly 15 via the exposed portion. The through hole 1221 may be a circular hole, a rectangular hole, or the like. The through hole 1221 may be provided at any location on the reinforcement member 122 as desired. This embodiment is compatible with the situations where “the reinforcing member 122 has flow-through capability” and “the reinforcing member 122 does not have flow-through capability”.

[0115] By adopting the above solution, by providing the through hole 1221 on the reinforcing member 122, at least a portion of the terminal body 121 can be exposed through the through hole 1221 and electrically connected to the electrode assembly 15. Based on this, it is convenient to establish an electrical connection between the terminal body 121 and the electrode assembly 15 across the reinforcing member 122, thereby reducing the impact of the reinforcing member 122 on the flow capacity between the terminal body 121 and the electrode assembly 15, which can help to ensure and improve the flow capacity between the terminal body 121 and the electrode assembly 15.

[0116] Of course, in other embodiments, even if the reinforcing member 122 is not connected to the end surface of the terminal body 121 close to the electrode assembly 15, the reinforcing member 122 can also be provided with the through hole 1221 as needed. Of course, the reinforcing member 122 can also omit the through hole 1221.

[0117] 5, 6, and 7, in some embodiments of the present application, the through hole 1221 is located in the middle of the reinforcing member 122. It should be noted that the through hole 1221 can be located in the middle of the reinforcing member 122, but is not limited to being completely centered.

[0118] By adopting the above solution, when the reinforcing piece 122 is connected to the end face of the terminal body 121 near the electrode assembly 15, by providing the through hole 1221 in the middle of the reinforcing piece 122, the middle region of the end face of the terminal body 121 near the electrode assembly 15 can be exposed through the through hole 1221 and electrically connected to the electrode assembly 15. Based on this, the middle region of the end face of the terminal body 121 can be easily connected to the electrode assembly 15 through the reinforcing piece 122, thereby ensuring and improving the connection convenience and connection reliability between the terminal body 121 and the electrode assembly 15, and optimizing the flow path and flow capacity between the terminal body 121 and the electrode assembly 15.

[0119] 5 , 6 , and 7 , in some embodiments of the present application, a mounting hole 1131 is formed through the first wall 113 , and the terminal body 121 is mounted in the mounting hole 1131 . Along the thickness direction of the reinforcing member 122 , the projection of the through hole 1221 is located within the projection of the mounting hole 1131 .

[0120] It should be noted that the first wall 113 is provided with a mounting hole 1131, which passes through the first wall 113 along the thickness direction of the first wall 113. The mounting hole 1131 is used to mount the terminal body 121, that is, the terminal body 121 is mounted in the mounting hole 1131. The mounting hole 1131 can be a circular hole, a rectangular hole, etc.

[0121] The reinforcing member 122 is provided with a through hole 1221. The projection of through hole 1221 along the thickness direction of the reinforcing member 122 is located within the projection of the mounting hole 1131. That is, along the thickness direction of the reinforcing member 122, the projection of through hole 1221 on the end surface of the terminal body 121 near the electrode assembly 15 falls within the range of the mounting hole 1131. This also means that the range of the through hole 1221 is no larger than the range of the mounting hole 1131.

[0122] By adopting the above solution, by ensuring that the projection of through-hole 1221 along the thickness direction of reinforcement member 122 falls within the projection of mounting hole 1131 along the thickness direction of reinforcement member 122, the range of through-hole 1221 is no larger than the range of mounting hole 1131. This ensures that through-hole 1221 is not located in the area of ​​reinforcement member 122 corresponding to the junction between terminal body 121 and mounting hole 1131, enabling reinforcement member 122 to reliably reinforce the junction between terminal body 121 and mounting hole 1131. This ensures and improves the overall structural strength of the junction between electrode terminal 12 and mounting hole 1131, reduces the risk of cracking in the junction between electrode terminal 12 and mounting hole 1131 due to stress concentration and poor structural strength, and ensures and extends the service life of battery cell 10.

[0123] Please refer to FIG. 5 , FIG. 6 , and FIG. 7 . In some embodiments of the present application, a groove 1211 is defined at one end of the terminal body 121 away from the electrode assembly 15 .

[0124] It should be noted that a groove 1211 is provided at one end of the terminal body 121 away from the electrode assembly 15, particularly at the end surface of the terminal body 121 away from the electrode assembly 15. The groove 1211 is a groove-like structure, which can be, but is not limited to, a rectangular groove. The bottom of the groove 1211 can be retained as the portion of the terminal body 121 that is electrically connected to the electrode assembly 15. The groove 1211 can be used to provide an operating space to facilitate related connection operations at the bottom of the groove 1211 from the outside of the terminal body 121.

[0125] By adopting the above solution, by providing the groove 1211 at the end of the terminal body 121 away from the electrode assembly 15, on the one hand, an operating space can be formed through the groove 1211, so that the connection operation of the groove bottom of the groove 1211 can be performed from the outside of the terminal body 121, thereby facilitating a convenient and reliable electrical connection between the groove bottom of the groove 1211 and the electrode assembly 15. On the other hand, the groove 1211 can reduce the material cost of the terminal body 121 and the electrode terminal 12, and reduce the weight of the terminal body 121 and the electrode terminal 12, thereby reducing the cost of the battery cell 10 and improving the weight energy density of the battery cell 10.

[0126] Please refer to FIG. 5 , FIG. 6 , and FIG. 7 . In some embodiments of the present application, along the thickness direction of the reinforcing member 122 , the projection of the groove 1211 is located within the projection of the through hole 1221 .

[0127] It should be noted that the end of the terminal body 121 facing away from the electrode assembly 15 is provided with a groove 1211. The reinforcing member 122 is provided with a through-hole 1221. In this case, the projection of the groove 1211 can be positioned within the projection of the through-hole 1221 along the thickness direction of the reinforcing member 122. That is, along the thickness direction of the reinforcing member 122, the projection of the groove 1211 on the end face of the terminal body 121 closest to the electrode assembly 15 will fall within the projection of the through-hole 1221 on the same end face. This also means that the setting range of the through-hole 1221 is not smaller than the setting range of the groove 1211.

[0128] By adopting the above solution, by ensuring that the projection of the groove 1211 along the thickness direction of the reinforcement member 122 falls within the projection of the through-hole 1221 along the thickness direction of the reinforcement member 122, the range of the through-hole 1221 is ensured to be no smaller than the range of the groove 1211. This ensures that the through-hole 1221 avoids the bottom portion of the groove 1211 and the main portion of the electrical connection between the terminal body 121 and the electrode assembly 15. This ensures and improves the connection convenience between the terminal body 121 and the electrode assembly 15. In particular, during the electrical connection between the terminal body 121 and the electrode assembly 15 by welding, the risk of portions of the reinforcement member 122 being mixed into the weld, forming impurities and affecting weld quality and current carrying capacity is reduced.

[0129] Please refer to FIG. 5 , FIG. 6 , and FIG. 7 . In some embodiments of the present application, a liquid injection hole 1212 communicating with the interior of the housing 11 is defined at the bottom of the groove 1211 .

[0130] It should be noted that a liquid injection hole 1212 is provided at the bottom of the groove 1211. The liquid injection hole 1212 is connected to the internal space of the shell 11 from the bottom of the groove 1211, so as to facilitate the injection of electrolyte from the outside of the shell 11 to the inside of the shell 11 via the liquid injection hole 1212. During the injection, the groove 1211 can play a short-term accommodating and guiding role for the electrolyte (similar to the role of a funnel), which can increase the operating space for injection and reduce the difficulty of injection. After the injection is completed, the liquid injection hole 1212 needs to be blocked by components such as seals. At this time, the groove 1211 can provide an operating space for the blocking of the liquid injection hole 1212, which can increase the operating space for blocking the liquid injection hole 1212 and reduce the difficulty of blocking the liquid injection hole 1212.

[0131] By adopting the above solution, by providing a liquid injection hole 1212 connected to the interior of the shell 11 at the bottom of the groove 1211, on the one hand, it is easy to inject electrolyte from the outside of the shell 11 into the interior of the shell 11 through the liquid injection hole 1212. In particular, during the liquid injection, the electrolyte can be temporarily accommodated through the groove 1211 and guided to flow to the liquid injection hole 1212, thereby reducing the difficulty of liquid injection and improving the convenience of liquid injection. On the other hand, during the period when the liquid injection is completed and the liquid injection hole 1212 is blocked by components such as a seal, the groove 1211 provides an operating space for blocking the liquid injection hole 1212, thereby reducing the difficulty of blocking the liquid injection hole 1212 and improving the convenience of blocking the liquid injection hole 1212.

[0132] Please refer to Figures 5, 6, 7 and 8. In some embodiments of the present application, the battery cell 10 includes a adapter 13, which is used to electrically connect the electrode assembly 15 and the terminal body 121. The adapter 13 is connected to the exposed portion of the terminal body 121 via the through hole 1221.

[0133] It should be noted that the adapter 13 is a current collecting component electrically connected between the electrode assembly 15 and the corresponding electrode terminal 12. The adapter 13 can be connected to the tab 152 of the electrode assembly 15 to achieve electrical connection with the electrode assembly 15. The adapter 13 can be connected to the portion of the terminal body 121 exposed via the through-hole 1221 to achieve electrical connection with the electrode terminal 12.

[0134] By adopting the above solution, the adapter 13 can be electrically connected to the electrode assembly 15 and to the portion of the terminal body 121 exposed through the through-hole 1221, thereby establishing a stable and reliable electrical connection between the electrode assembly 15 and the terminal body 121. Based on this, the adapter 13 can be used to collect and pass current between the electrode assembly 15 and the terminal body 121. Moreover, because the adapter 13 is directly connected to the portion of the terminal body 121 exposed through the through-hole 1221, passing over the reinforcement 122, it can also effectively reduce the impact of the reinforcement 122 on the flow capacity between the terminal body 121 and the adapter 13. This can help to ensure and improve the flow capacity between the terminal body 121 and the electrode assembly 15.

[0135] Please refer to Figures 5, 6, 8 and 9. In some embodiments of the present application, the adapter 13 includes an adapter body 131 and a first protrusion 132 provided on the adapter body 131. The first protrusion 132 is passed through the through hole 1221 and connected to the terminal body 121.

[0136] It should be noted that the adapter body 131 is the portion of the adapter 13 that is used for electrical connection with the electrode assembly 15. The adapter body 131 can be disposed on the side of the reinforcement 122 away from the terminal body 121. The first protrusion 132 is a raised structure disposed on the side of the adapter body 131 near the electrode terminal 12 and protruding toward the terminal body 121. The first protrusion 132 can be inserted into the through hole 1221 of the reinforcement 122 and electrically connected to the portion of the terminal body 121 exposed through the through hole 1221.

[0137] By adopting the above solution, the adapter 13 can conveniently and reliably electrically connect to the tab 152 of the electrode assembly 15 through the adapter body 131, thereby ensuring and improving the connection convenience, connection reliability, and flow capacity between the adapter 13 and the electrode assembly 15. The adapter 13 can also pass through the first protrusion 132 provided on the adapter body 131, which is precisely aligned and penetrates the through hole 1221, so as to pass over the reinforcement 122 and reliably electrically connect to the portion of the terminal body 121 exposed through the through hole 1221, thereby ensuring and improving the connection convenience, connection reliability, and flow capacity between the adapter 13 and the terminal body 121.

[0138] In addition, the adapter 13 can combine the thickness of the first protrusion 132 and the part of the adapter body 131 corresponding to the first protrusion 132 to ensure that the adapter 13 has sufficient thickness to be connected to the terminal body 121, thereby ensuring that a reliable and effective connection can be established between the adapter 13 and the terminal body 121, ensuring and expanding the effective melting depth between the adapter 13 and the terminal body 121, and reducing the risk of burnt membranes, cold welds and other phenomena.

[0139] On the basis that the combined thickness of the first protrusion 132 and the portion of the adapter body 131 corresponding to the first protrusion 132 can meet the aforementioned requirements, the adapter 13 can correspondingly reduce the thickness of the adapter body 131, and allow at least a portion of the first protrusion 132 to pass through the through-hole 1221, so that at least a portion of the first protrusion 132 can share space with the reinforcing member 122 in the thickness direction of the reinforcing member 122. This effectively reduces the additional space occupied by the adapter 13 on the side of the reinforcing member 122 away from the terminal body 121, and effectively reduces the combined space occupied by the adapter 13 and the electrode terminal 12 within the housing 11, thereby facilitating an increase in the volumetric energy density of the battery cell 10.

[0140] Among them, the thickness of the first protrusion 132 is the dimension of the first protrusion 132 in the thickness direction of the adapter 13, the thickness of the adapter body 131 is the dimension of the adapter body 131 in the thickness direction of the adapter 13, and the thickness direction of the adapter 13 is parallel to the central axis of the adapter 13.

[0141] Please refer to FIG. 10 . In some embodiments of the present application, a portion of the terminal body 121 exposed through the through hole 1221 is provided with a second protrusion 1216 . The second protrusion 1216 passes through the through hole 1221 and is connected to the adapter 13 .

[0142] It should be noted that the second protrusion 1216 is a protruding structure provided on the portion of the terminal body 121 exposed through the through hole 1221 and protruding toward the adapter 13. The second protrusion 1216 can pass through the through hole 1221 of the reinforcement 122 and electrically connect to the portion of the adapter 13 corresponding to the through hole 1221.

[0143] By adopting the above-mentioned solution, the terminal body 121 can be precisely aligned and penetrated into the through hole 1221 through the second protrusion 1216, so as to pass over the reinforcement 122 and be reliably electrically connected to the part of the adapter 13 corresponding to the through hole 1221, thereby ensuring and improving the connection convenience, connection reliability and current-carrying capacity between the terminal body 121 and the adapter 13.

[0144] Moreover, based on the setting of the second protrusion 1216, it can be ensured that in the area corresponding to the second protrusion 1216, there is sufficient connection thickness between the terminal body 121 and the adapter 13, thereby ensuring that a reliable and effective connection can be established between the terminal body 121 and the adapter 13, ensuring and expanding the effective melting depth between the terminal body 121 and the adapter 13, and reducing the risk of burnt diaphragms, cold welds and the like.

[0145] Given that the area corresponding to the second protrusion 1216 has sufficient connection thickness to meet connection strength requirements, the adapter 13 can be thinned accordingly. This effectively reduces the additional space occupied by the adapter 13 on the side of the reinforcement 122 away from the terminal body 121. Furthermore, because at least a portion of the second protrusion 1216 is disposed within the through-hole 1221, at least a portion of the second protrusion 1216 can share space with the reinforcement 122 in the thickness direction. This effectively reduces the combined space occupied by the adapter 13 and electrode terminal 12 within the housing 11, thereby improving the volumetric energy density of the battery cell 10.

[0146] The thickness of the second protrusion 1216 is the dimension of the second protrusion 1216 in the thickness direction of the terminal body 121 .

[0147] Please refer to FIG. 6 and FIG. 10 . In some embodiments of the present application, the adapter 13 abuts against the side of the reinforcing member 122 away from the terminal body 121 .

[0148] It should be noted that, as shown in Figure 6, when the adapter 13 includes an adapter body 131 and a first protrusion 132, and the first protrusion 132 is passed through the through hole 1221 and connected to the terminal body 121, the thickness of the first protrusion 132 can be made less than or equal to the thickness of the reinforcement 122, so that the entire first protrusion 132 can share space with the reinforcement 122 in the thickness direction of the reinforcement 122, thereby allowing the adapter body 131 of the adapter 13 to abut against the side of the reinforcement 122 away from the terminal body 121. In particular, when the thickness of the first protrusion 132 is equal to the thickness of the reinforcement 122, if the combined thickness of the first protrusion 132 and the portion of the adapter body 131 corresponding to the first protrusion 132 is a certain value, the thickness of the adapter body 131 can be equal to the combined thickness minus the thickness of the reinforcement 122. That is, the thickness of the adapter body 131 can be precisely thinned based on the difference between the combined thickness and the thickness of the reinforcement 122.

[0149] As shown in Figure 10, a second protrusion 1216 is provided on the portion of the terminal body 121 exposed through the through hole 1221. When the second protrusion 1216 is passed through the through hole 1221 and connected to the adapter 13, the thickness of the second protrusion 1216 can be made less than or equal to the thickness of the reinforcement 122, so that the entire second protrusion 1216 can share space with the reinforcement 122 in the thickness direction of the reinforcement 122, thereby allowing the adapter 13 to abut against the side of the reinforcement 122 away from the terminal body 121.

[0150] The thickness of the reinforcing piece 122 refers to the dimension of the reinforcing piece 122 in the thickness direction of the reinforcing piece 122 .

[0151] By adopting the above-mentioned solution, the adapter 13 can be made to abut against the side of the reinforcement 122 away from the terminal body 121 to compress the gap space between the adapter 13 and the reinforcement 122, thereby compressing the combined occupied space of the adapter 13 and the electrode terminal 12 in the outer shell 11 to a large extent, thereby ensuring and improving the volume energy density of the battery cell 10.

[0152] Of course, in other embodiments, the thickness of the first protrusion 132 may be greater than the thickness of the reinforcing member 122, so that a portion of the first protrusion 132 can be inserted into the through-hole 1221 while a portion of the first protrusion 132 is exposed outside the through-hole 1221. Alternatively, the thickness of the second protrusion 1216 may be greater than the thickness of the reinforcing member 122, so that a portion of the second protrusion 1216 can be inserted into the through-hole 1221 while a portion of the second protrusion 1216 is exposed outside the through-hole 1221.

[0153] 5 and 6 , in some embodiments of the present application, the adapter 13 is connected to the tab 152 of the electrode assembly 15 to form a connection mark 133. Along the thickness direction of the reinforcing member 122, the projection of the reinforcing member 122 and the projection of the connection mark 133 at least partially overlap.

[0154] It should be noted that the adapter 13 can be connected to the tab 152 of the electrode assembly 15 by, but not limited to, welding. After connection, a connection mark 133 can be formed at the connection between the adapter 13 and the tab 152. When the adapter 13 and the tab 152 are welded, the connection mark 133 is a weld mark.

[0155] Along the thickness direction of the reinforcing member 122, the projection of the reinforcing member 122 at least partially overlaps with the projection of the connection mark 133. That is, along the thickness direction of the reinforcing member 122, the projection of the reinforcing member 122 on the side of the adapter 13 near the electrode assembly 15 overlaps with the connection mark 133.

[0156] By adopting the above solution, by ensuring that the projection of the reinforcing member 122 along the thickness direction of the reinforcing member 122 at least partially overlaps with the projection of the connection mark 133 along the thickness direction of the reinforcing member 122, the reinforcing member 122 can reliably reinforce the portion of the terminal body 121 corresponding to the connection mark 133. Based on this, during the use of the battery cell 10, especially when the electrode assembly 15 shakes and impacts the terminal body 121 via the connection mark 133, the reinforcing effect of the reinforcing member 122 on the portion of the terminal body 121 corresponding to the connection mark 133 can effectively reduce the risk of damage to the terminal body 121 due to the impact, thereby ensuring and improving the reliability of the battery cell 10 and ensuring and extending the service life of the electrode terminal 12 and the battery cell 10.

[0157] Referring to Figures 5, 6, and 7, in some embodiments of the present application, a mounting hole 1131 is formed through the first wall 113. The terminal body 121 includes a main body 1213, a first flange 1214, and a second flange 1215. The main body 1213 is inserted into the mounting hole 1131. The first flange 1214 and the second flange 1215 are disposed at opposite ends of the main body 1213, and the first flange 1214 and the second flange 1215 cooperate to clamp the first wall 113.

[0158] It should be noted that the first wall 113 is provided with a mounting hole 1131, which passes through the first wall 113 along the thickness direction of the first wall 113. The mounting hole 1131 is used to mount the terminal body 121, that is, the terminal body 121 is mounted in the mounting hole 1131. The mounting hole 1131 can be a circular hole, a rectangular hole, etc.

[0159] It should also be noted that the terminal body 121 includes a main body 1213, a first flange 1214, and a second flange 1215. The main body 1213 is the portion of the terminal body 121 that passes through the mounting hole 1131. The main body 1213 passes through the mounting hole 1131, and the mounting hole 1131 can circumferentially limit the main body 1213.

[0160] The first flange portion 1214 is connected to one end of the main body 1213 and protrudes from the outer circumference of the main body 1213. The first flange portion 1214 can be stopped and limited at one side of the mounting hole 1131 and abut against one side surface of the first wall 113 along the thickness direction of the first wall 113. Correspondingly, the second flange portion 1215 is connected to the other end of the main body 1213 and protrudes from the outer circumference of the main body 1213. The second flange portion 1215 can be stopped and limited at the other side of the mounting hole 1131 and abut against the other side surface of the second wall along the thickness direction of the second wall. The first flange portion 1214 and the second flange portion 1215 can cooperate to jointly clamp the first wall 113 therebetween to prevent the terminal body 121 from being separated from the mounting hole 1131, that is, to prevent the electrode terminal 12 from being separated from the first wall 113.

[0161] By adopting the above solution, the terminal body 121 can be inserted into the mounting hole 1131 through the main body 1213, and the first flange portion 1214 and the second flange portion 1215 provided at opposite ends of the main body 1213 cooperate to jointly clamp the first wall 113 to achieve a stable installation in the mounting hole 1131. Based on this, the installation reliability between the terminal body 121 and the mounting hole 1131 can be effectively improved, and the terminal body 121 can be effectively restricted from being separated from the mounting hole 1131, thereby ensuring and improving the assembly reliability between the electrode terminal 12 and the first wall 113, and ensuring and improving the structural reliability of the battery cell 10.

[0162] Of course, in other embodiments, the terminal body 121 may adopt other structural forms.

[0163] Please refer to FIG. 5 , FIG. 6 , and FIG. 7 . In some embodiments of the present application, the main body 1213 , the first flange 1214 , and the second flange 1215 are integrally formed.

[0164] It should be noted that the main body 1213, the first flange 1214, and the second flange 1215 are integrally formed, i.e., the main body 1213, the first flange 1214, and the second flange 1215 form an integrated structure. In some embodiments, the terminal body 121 can be mounted in the mounting hole 1131 by flanging and riveting, so that the terminal body 121 forms the main body 1213, the first flange 1214, and the second flange 1215.

[0165] By adopting the above-mentioned scheme, by integrally arranging the main body 1213, the first flange portion 1214 and the second flange portion 1215, the processing and forming of the terminal body 121 can be facilitated, and the structural reliability of the terminal body 121 can be improved, and the assembly convenience and assembly reliability between the terminal body 121 and the mounting hole 1131 can be improved.

[0166] Please refer to FIG. 5 , FIG. 6 , and FIG. 7 . In some embodiments of the present application, a groove 1211 is defined at one end of the main body 1213 away from the electrode assembly 15 .

[0167] It should be noted that a groove 1211 is provided at one end of the main body 1213 away from the electrode assembly 15, particularly at the end surface of the main body 1213 away from the electrode assembly 15. The groove 1211 is a slot-like structure that can be, but is not limited to, a rectangular groove. The bottom of the groove 1211 can be retained as the portion of the main body 1213 that electrically connects to the electrode assembly 15. The groove 1211 can be used to provide an operating space to facilitate connection operations at the bottom of the groove 1211 from outside the main body 1213.

[0168] By adopting the above solution, by providing the groove 1211 at the end of the main body 1213 away from the electrode assembly 15, on the one hand, an operating space can be formed through the groove 1211, so that the connection operation of the groove bottom of the groove 1211 can be performed from the outside of the main body 1213, thereby facilitating a convenient and reliable electrical connection between the groove bottom of the groove 1211 and the electrode assembly 15. On the other hand, the groove 1211 can reduce the material cost of the main body 1213 and the electrode terminal 12, and reduce the weight of the main body 1213 and the electrode terminal 12, thereby reducing the cost of the battery cell 10 and improving the weight energy density of the battery cell 10.

[0169] In some embodiments, an insulating structure 14 is provided between the main body 1213 and the first wall 113 , between the first flange 1214 and the first wall 113 , and between the second flange 1215 and the first wall 113 to insulate the terminal body 121 and the first wall 113 from each other.

[0170] Please refer to FIG. 5 , FIG. 6 , and FIG. 7 . In some embodiments of the present application, the structural strength of the reinforcing piece 122 is greater than the structural strength of the terminal body 121 .

[0171] It should be noted that the structural strength of the reinforcing piece 122 is greater than the structural strength of the terminal body 121 . In other words, the structural strength of the material of the reinforcing piece 122 is greater than the structural strength of the material of the terminal body 121 .

[0172] In some embodiments, the electrode terminal 12 provided with the reinforcing member 122 may be a positive electrode terminal 12a, which is used to electrically connect to the positive electrode tab 152a of the electrode assembly 15. The terminal body 121 of the positive electrode terminal 12a may be made of aluminum, an aluminum alloy, or the like. Depending on the material of the terminal body 121 of the positive electrode terminal 12a, the reinforcing member 122 may be made of any material with greater structural strength.

[0173] In some embodiments, the electrode terminal 12 provided with the reinforcing member 122 may be the negative electrode terminal 12b, which is used to electrically connect to the negative electrode tab 152b of the electrode assembly 15. The terminal body 121 of the negative electrode terminal 12b may be made of copper, a copper alloy, or the like. Depending on the material of the terminal body 121 of the negative electrode terminal 12b, the reinforcing member 122 may be made of any material with greater structural strength.

[0174] In the case where both the positive electrode terminal 12a and the negative electrode terminal 12b are provided with a reinforcing piece 122 , the reinforcing piece 122 of the positive electrode terminal 12a and the reinforcing piece 122 of the negative electrode terminal 12b can be made of the same material, or different materials can be used for their respective terminal bodies 121 .

[0175] By adopting the above solution, by making the structural strength of the reinforcement piece 122 greater than the structural strength of the terminal body 121, on the one hand, the reinforcing effect of the reinforcement piece 122 on the terminal body 121 can be guaranteed and improved, and the electrode terminal 12 can be enabled to achieve better structural strength through the composite structure of the terminal body 121 and the reinforcement piece 122, thereby ensuring that the electrode terminal 12 can meet the processing and assembly requirements, and can ensure that the electrode terminal 12 can withstand deformation internal stress during the use of the battery cell 10, and can reduce the risk of cracking of the electrode terminal 12 due to stress concentration and poor structural strength, and can ensure and extend the service life of the electrode terminal 12 and the battery cell 10.

[0176] On the other hand, this allows the electrode terminal 12 to achieve greater structural strength with a smaller thickness, facilitating a reduction in the thickness of the electrode terminal 12. Furthermore, as the ratio of the structural strength of the reinforcing member 122 to the structural strength of the terminal body 121 increases, the reinforcing member 122 provides greater reinforcement to the terminal body 121 per unit thickness, allowing the terminal body 121 to be thinned further, and thus the electrode terminal 12 to be thinned further. This effectively reduces the thickness of the electrode terminal 12, correspondingly reducing the space occupied by the electrode terminal 12 in the battery cell 10 and thereby improving the volumetric energy density of the battery cell 10.

[0177] Please refer to FIG. 5 , FIG. 6 , and FIG. 7 . In some embodiments of the present application, the reinforcement 122 includes at least one of steel, titanium, and tungsten.

[0178] By adopting the above-mentioned solution, the reinforcing piece 122 can be made to include at least one of steel, titanium, and tungsten, so that the reinforcing piece 122 has better structural strength and can provide effective and reliable reinforcement for the terminal body 121, thereby facilitating the thinning of the electrode terminal 12 and improving the volume energy density of the battery cell 10.

[0179] Of course, in other embodiments, the reinforcing piece 122 may be made of other materials.

[0180] 3 to 9 , based on the above embodiments, the present application provides a specific example of a battery cell 10 .

[0181] The battery cell 10 includes a shell 11, an electrode terminal 12, an adapter 13 and an electrode assembly 15. The shell 11 includes a first wall 113, and a mounting hole 1131 is passed through the first wall 113. The electrode terminal 12 includes a terminal body 121 and a reinforcement piece 122. The terminal body 121 includes a main body 1213, a first flange portion 1214 and a second flange portion 1215. The main body 1213 is passed through the mounting hole 1131. The first flange portion 1214 and the second flange portion 1215 are respectively arranged at opposite ends of the main body 1213, the first flange portion 1214 is located on the outside of the first wall 113, and the second flange portion 1215 is located on the inside of the first wall 113. The first flange portion 1214 and the second flange portion 1215 cooperate to clamp the first wall 113. The first flange portion 1214 is provided with a groove 1211, and a liquid injection hole 1212 is provided at the bottom of the groove 1211, which is connected to the housing 11. The terminal body 121 can be installed in the mounting hole 1131 by flanging and riveting, thereby forming the main body 1213, the first flange portion 1214 and the second flange portion 1215.

[0182] The reinforcing piece 122 is connected to the end face of the second flange portion 1215 facing away from the first flange portion 1214. The structural strength of the reinforcing piece 122 is greater than that of the terminal body 121, and both the reinforcing piece 122 and the terminal body 121 are resistant to corrosion by the electrolyte. A through hole 1221 is provided in the middle portion of the reinforcing piece 122. The through hole 1221 penetrates the reinforcing piece 122 along the thickness direction of the reinforcing piece 122. Along the thickness direction of the reinforcing piece 122, the projection of the through hole 1221 is located within the projection of the mounting hole 1131, and the projection of the groove 1211 is located within the projection of the through hole 1221. The middle area of ​​the end face of the second flange portion 1215 is exposed through the through hole 1221.

[0183] The adapter 13 includes an adapter body 131 and a first protrusion 132. The adapter body 131 is disposed on the side of the reinforcement 122 facing away from the terminal body 121. The first protrusion 132 is disposed on the side of the adapter body 131 facing the terminal body 121. The first protrusion 132 is disposed through the through hole 1221 of the reinforcement 122 and is electrically connected to the end face area of ​​the second flange portion 1215 exposed through the through hole 1221. The thickness of the first protrusion 132 is equal to the thickness of the reinforcement 122. The adapter body 131 abuts the side of the reinforcement 122 away from the terminal body 121.

[0184] The electrode assembly 15 is located on the side of the adapter 13 facing away from the electrode terminal 12. The tab 152 of the electrode assembly 15 is connected to the adapter body 131 to form a connection mark 133. Along the thickness direction of the reinforcement 122, the projection of the reinforcement 122 and the projection of the connection mark 133 at least partially overlap.

[0185] Based on the above arrangement, the reinforcing piece 122 can reinforce the terminal body 121, particularly the second flange portion 1215, thereby ensuring and enhancing the combined structural strength of the reinforcing piece 122 and the second flange portion 1215, and the combined structural strength of the reinforcing piece 122 and the terminal body 121. Thus, under the reinforcing effect of the reinforcing piece 122, the electrode terminal 12, particularly the reinforcing piece 122 and the second flange portion 1215, can have excellent combined structural strength, enabling processing steps such as flanging and riveting, establishing a reliable electrical connection with the electrode assembly 15, and being able to withstand deformational internal stress during use of the battery cell 10. It is also less likely to crack due to stress concentration and poor structural strength.

[0186] While ensuring the overall structural strength of the electrode terminal 12 meets the aforementioned requirements, the thickness of the electrode terminal 12 can be reduced, particularly the thickness of the second flange portion 1215. The combined thickness of the reinforcing member 122 and the second flange portion 1215 can be reduced. In other words, the composite structure of the terminal body 121 and the reinforcing member 122 allows the electrode terminal 12 to achieve improved structural strength with a reduced thickness. Furthermore, as the ratio of the structural strength of the reinforcing member 122 to the structural strength of the terminal body 121 increases, the reinforcing member 122 provides greater reinforcement to the terminal body 121 per unit thickness. This allows the terminal body 121, and particularly the second flange portion 1215, to be further reduced, further reducing the thickness of the electrode terminal 12. This reduces the thickness of the electrode terminal 12, thereby reducing the space occupied by the electrode terminal 12 within the outer casing 11 and increasing the volumetric energy density of the battery cell 10.

[0187] In a specific application example, the terminal body 121 is made of aluminum and the reinforcement 122 is made of steel. According to the ratio of the structural strength of steel to the structural strength of aluminum, every 0.1mm (millimeter) thickness of steel can replace 0.3mm to 0.4mm thickness of aluminum. Based on this, this example uses a 0.4mm second flange portion 1215 made of aluminum, combined with a 0.2mm reinforcement 122 made of steel, to ensure that the thickness of the second flange portion 1215 can meet the electrical connection requirements, and to ensure that the comprehensive structural strength of the reinforcement 122 and the second flange portion 1215 can meet the above requirements. Therefore, compared with the electrode terminal 12 that is not provided with a reinforcement 122 and the second flange portion 1215 needs to be provided with at least 1.0mm to ensure strength, the portion of the electrode terminal 12 of this example that is provided in the outer shell 11 can be thinned by at least 0.4mm.

[0188] Based on the above arrangement, the tab 152 of the electrode assembly 15 can be electrically connected to the adapter body 131 of the adapter 13. The first protrusion 132 of the adapter 13 can be inserted into the through-hole 1221, passing over the reinforcement 122 and electrically connected to the second flange 1215 of the terminal body 121. This ensures that the electrode assembly 15 can form a reliable electrical connection with the terminal body 121 via the adapter 13, reduces the impact of the reinforcement 122 on the flow of current between the electrode assembly 15, adapter 13, and terminal body 121, and ensures and improves the flow capacity between the electrode assembly 15, adapter 13, and terminal body 121, thereby ensuring the performance of the battery cell 10.

[0189] Based on the above arrangement, at the portion of the first protrusion 132 and the adapter body 131 corresponding to the first protrusion 132, the combined thickness of the first protrusion 132 and the adapter body 131 can ensure that the adapter 13 has sufficient connection thickness, can ensure that the adapter 13 can establish a reliable and effective connection with the terminal body 121, can also establish a reliable and effective connection with the electrode assembly 15, can expand the effective melting depth, and can reduce the risk of diaphragm burns, cold welds and the like.

[0190] On the basis that the combined thickness of the first protrusion 132 and the portion of the adapter body 131 corresponding to the first protrusion 132 can meet the aforementioned requirements, the thickness of the adapter body 131 can be reduced accordingly, and the first protrusion 132 can be inserted into the through-hole 1221 so that the first protrusion 132 can share space with the reinforcing member 122 in the thickness direction. This effectively reduces the additional space occupied by the adapter 13 on the side of the reinforcing member 122 away from the terminal body 121, and effectively reduces the combined space occupied by the adapter 13 and the electrode terminal 12 within the housing 11, thereby improving the volumetric energy density of the battery cell 10.

[0191] In one specific application example, a 0.2mm steel reinforcement 122 is used. Accordingly, the thickness of the first protrusion 132 of the adapter 13 is set to 0.2mm. At the portion of the first protrusion 132 and the adapter body 131 corresponding to the first protrusion 132, the combined thickness of the first protrusion 132 and the adapter body 131 is set to 0.4mm to ensure connection. Therefore, the thickness of the adapter body 131 is equal to the combined thickness minus the thickness of the first protrusion 132, which is 0.2mm. Therefore, when the first protrusion 132 is inserted into the through hole 1221, only the adapter body 131 of the adapter 13 requires additional space on the side of the reinforcement 122 away from the terminal body 121. Compared to an adapter 13 without the first protrusion 132 and requiring a thickness of at least 0.4mm to ensure connection, the portion of the adapter 13 in this example located on the side of the reinforcement 122 away from the terminal body 121 can be at least 0.2mm thinner.

[0192] Please refer to Figures 2 and 3. Some embodiments of the present application provide a battery 1. The battery 1 includes a battery cell 10 provided in an embodiment of the present application.

[0193] By adopting the above solution, the battery 1 can improve the volume energy density and space utilization of the battery 1 by applying the battery cell 10 provided in the embodiment of the present application.

[0194] Please refer to Figures 1 and 3. Some embodiments of the present application provide an electrical device, which includes a battery 1 provided in an embodiment of the present application, or a battery cell 10 provided in an embodiment of the present application.

[0195] By adopting the above solution, the electrical device can ensure and improve the performance of the electrical device by applying the battery 1 or battery cell 10 provided in the embodiment of the present application.

[0196] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery cell, wherein: include: a housing including a first wall; an electrode assembly, contained in the housing; The electrode terminal comprises a terminal body and a reinforcing piece, wherein the terminal body is arranged on the first wall and is electrically connected to the electrode assembly, and the reinforcing piece is connected to one end of the terminal body along the thickness direction of the terminal body.

2. The battery cell according to claim 1, wherein: The reinforcing piece is connected to one end of the terminal body close to the electrode assembly.

3. The battery cell according to claim 2, wherein: The reinforcing piece is connected to the end surface of the terminal body close to the electrode assembly.

4. The battery cell according to claim 3, wherein: The reinforcing piece is provided with a through hole, and the through hole penetrates the reinforcing piece along the thickness direction of the reinforcing piece, and at least a portion of the terminal body is exposed through the through hole and is electrically connected to the electrode assembly.

5. The battery cell according to claim 4, wherein: The through hole is located in the middle of the reinforcing piece.

6. The battery cell according to claim 4 or 5, wherein: The first wall is penetrated by a mounting hole, and the terminal body is mounted in the mounting hole; Along the thickness direction of the reinforcing member, the projection of the through hole is located within the projection of the mounting hole.

7. The battery cell according to any one of claims 4 to 6, wherein: A groove is provided at one end of the terminal body away from the electrode assembly; Along the thickness direction of the reinforcing member, the projection of the groove is located within the projection of the through hole.

8. The battery cell according to any one of claims 4 to 7, wherein: The battery cell includes a transition piece, the transition piece is used to electrically connect the electrode assembly and the terminal body, and the transition piece is connected to a portion of the terminal body exposed via the through hole.

9. The battery cell according to claim 8, wherein: The adapter comprises an adapter body and a first convex portion disposed on the adapter body, wherein the first convex portion passes through the through hole and is connected to the terminal body; Alternatively, a portion of the terminal body exposed through the through hole is provided with a second protrusion, and the second protrusion passes through the through hole and is connected to the adapter.

10. The battery cell according to claim 9, wherein: The adapter is in contact with a side surface of the reinforcing member away from the terminal body.

11. The battery cell according to any one of claims 8 to 10, wherein: The adapter is connected to the electrode tab of the electrode assembly to form a connection mark; Along the thickness direction of the reinforcing member, the projection of the reinforcing member at least partially overlaps with the projection of the connecting mark.

12. The battery cell according to any one of claims 1 to 11, wherein: The first wall is penetrated by a mounting hole; The terminal body includes a main body, a first flange and a second flange. The main body is inserted into the mounting hole. The first flange and the second flange are disposed at opposite ends of the main body. The first flange and the second flange cooperate to clamp the first wall.

13. The battery cell according to claim 12, wherein: The main body, the first flange and the second flange are integrally provided.

14. The battery cell according to claim 12 or 13, wherein: A groove is formed at one end of the main body away from the electrode assembly.

15. The battery cell according to any one of claims 1 to 14, wherein: The structural strength of the reinforcing piece is greater than the structural strength of the terminal body.

16. A battery, wherein: The battery comprises the battery cell according to any one of claims 1 to 15.

17. An electrical device, wherein: The electrical device comprises the battery according to claim 16, or the battery cell according to any one of claims 1-15.

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