Battery cells, batteries, and power consumption devices

Abstract

This application relates to the field of batteries and provides a battery cell (10), a battery (1), and a power consumption device. The battery cell (10) includes a housing (11), an electrode assembly (15), and an electrode terminal (12). The housing (11) includes a first wall (113). The electrode assembly (15) is housed within the housing (11). The electrode terminal (12) includes a terminal body (121) and a reinforcing member (122). The terminal body (121) is mounted on the first wall (113) and electrically connected to the electrode assembly (15). The reinforcing member (122) is connected to one end of the terminal body (121) along the thickness direction of the terminal body (121). Based on the above structure, the electrode terminal (12) can achieve superior structural strength, thereby reducing the risk of stress concentration and cracking due to insufficient structural strength in the electrode terminal (12), and extending the service life of the electrode terminal (12) and the battery cell (10).

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on August 31, 2023, with the application number 202311118924.7 and the invention title "Battery Cell, Battery and Power Consumption Device", and all of its content is incorporated herein by reference.

[0002] Embodiments of this application relate to the field of batteries, and particularly to battery cells, batteries and power consumption devices.

Background Art

[0003] In some cases, a battery cell includes an end cap and an electrode terminal attached to the end cap. During the use period of the battery cell, the electrode terminal continuously receives internal deformation stress. However, the structural strength of the electrode terminal is generally low.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Embodiments of this application provide a battery cell, a battery and a power consumption device, aiming to solve the problem that the structural strength of the electrode terminal is generally low.

Means for Solving the Problems

[0005] To achieve the above object, embodiments of this application adopt the following technical solutions.

[0006] According to a first aspect, a battery cell is provided, including a housing including a first wall, an electrode assembly housed in the housing, and an electrode terminal including a terminal body and a reinforcing member. The terminal body is installed on the first wall and electrically connected to the electrode assembly, and the reinforcing member is connected to one end of the terminal body along the thickness direction of the terminal body.

[0007] In the embodiment of this application, at least one electrode terminal may include a terminal body and a reinforcing member. Based on this, the electrode terminal can be electrically connected to the electrode assembly via a terminal body mounted on a first wall to realize the output or input of electrical energy. The electrode terminal may also be connected to one end of the terminal body along the thickness direction of the terminal body via a reinforcing member, thereby reinforcing the terminal body and ensuring and strengthening the overall structural strength of both the terminal body and the reinforcing member. Based on this, the electrode terminal can achieve superior structural strength through the composite structure of the terminal body and the reinforcing member, thereby ensuring that the electrode terminal can meet processing and assembly requirements and that the electrode terminal can withstand deformation internal stress during the service life of the battery cell, thereby reducing the risk of stress concentration and cracking due to insufficient structural strength in the electrode terminal, and ensuring and extending the service life of the electrode terminal and the battery cell. Furthermore, in addition to achieving superior structural strength, the composite structure of the terminal body and the reinforcing member can also reduce the amplification of the electrode terminal thickness, thereby reducing the adverse effect on the volumetric energy density of the battery cell.

[0008] In some embodiments, the reinforcing member is connected to one end of the terminal body that is close to the electrode assembly.

[0009] By adopting the above method, the reinforcing member can be connected to one end of the terminal body adjacent to the electrode assembly, thereby reinforcing the portion of the terminal body located inside the housing via the reinforcing member. Based on this, the overall structural strength of the portion of the electrode terminal located inside the housing can be guaranteed and strengthened, giving the portion of the electrode terminal located inside the housing relatively excellent overall structural strength, allowing it to be processed and securely fitted to the first wall, establishing a reliable electrical connection with the electrode assembly, being able to withstand deformation and internal stress during the battery cell's service life, and making it less prone to cracking due to stress concentration and insufficient structural strength. In addition, it is also advantageous in reducing the amplification of the thickness of the portion of the electrode terminal located inside the housing, thereby constraining the space occupied within the electrode terminal housing and reducing the adverse effect on the volumetric energy density of the battery cell.

[0010] In some embodiments, the reinforcing member is connected to the end face of the terminal body that is adjacent to the electrode assembly.

[0011] By adopting the above method, the convenience and reliability of the connection between the reinforcing member and the terminal body can be improved by connecting the reinforcing member to the end face of the terminal body adjacent to the electrode assembly, and the installation area of ​​the reinforcing member at the end face of the terminal body adjacent to the electrode assembly can be ensured, thereby ensuring that the reinforcing member can provide large-area, more uniform, and more effective reinforcement to the portion of the terminal body located within the housing. This is advantageous in ensuring and strengthening the overall structural strength of the portion of the electrode terminal located within the housing, and is advantageous in reducing the amplification of the thickness of the portion of the electrode terminal located within the housing in a balanced manner, thereby constraining the occupied space within the housing of the electrode terminal in a balanced manner and reducing the adverse effect on the volumetric energy density of the battery cell.

[0012] In some embodiments, the reinforcing member is provided with through holes that penetrate the reinforcing member along the thickness direction, and at least a portion of the terminal body is exposed through the through holes and electrically connected to the electrode assembly.

[0013] By adopting the above method, a through-hole is provided in the reinforcing member, allowing at least a portion of the terminal body to be exposed through the through-hole and electrically connected to the electrode assembly. Based on this, it becomes easier to establish an electrical connection between the terminal body and the electrode assembly beyond the reinforcing member, thereby reducing the influence of the reinforcing member on the overcurrent capacity between the terminal body and the electrode assembly, which is advantageous in ensuring and improving the overcurrent capacity between the terminal body and the electrode assembly.

[0014] In some embodiments, the through-hole is located in the center of the reinforcing member.

[0015] By adopting the above method, when the reinforcing member is connected to the end face of the terminal body adjacent to the electrode assembly, a through hole is provided in the center of the reinforcing member, thereby exposing the central region of the end face of the terminal body adjacent to the electrode assembly through the through hole and enabling an electrical connection with the electrode assembly. Based on this, it is possible to facilitate the establishment of an electrical connection relationship between the central region of the end face of the terminal body and the electrode assembly beyond the reinforcing member, thereby ensuring and improving the convenience and reliability of the connection between the terminal body and the electrode assembly, and optimizing the overcurrent path and overcurrent capacity between the terminal body and the electrode assembly.

[0016] In some embodiments, a mounting hole is made through the first wall, and the terminal body is mounted in the mounting hole, with the projection of the through hole located within the projection of the mounting hole, along the thickness direction of the reinforcing member.

[0017] By adopting the above method, the projection of the through-hole along the thickness direction of the reinforcing member can be made to fit within the projection of the mounting hole along the thickness direction of the reinforcing member, thereby encouraging that the area where the through-hole is provided is less than or equal to the area where the mounting hole is provided. Based on this, it can be ensured that the through-hole is not provided in the area corresponding to the connection point between the terminal body of the reinforcing member and the mounting hole, and it can be ensured that the reinforcing member can reliably reinforce the area where the terminal body and the mounting hole are connected. This ensures and improves the overall structural strength of the connection point between the electrode terminal and the mounting hole, reduces the risk of stress concentration and cracking due to insufficient structural strength in the area where the electrode terminal and the mounting hole are connected, and ensures and extends the service life of the battery cell.

[0018] In some embodiments, a groove is provided at one end of the terminal body away from the electrode assembly, and along the thickness direction of the reinforcing member, the projection of the groove lies within the projection of the through hole.

[0019] By adopting the above method, a groove can be provided at one end of the terminal body away from the electrode assembly. On the one hand, this creates an operating space through the groove, making it easier to perform connection operations at the bottom of the groove from outside the terminal body, thereby making it easier to establish an electrical connection relationship between the bottom of the groove and the electrode assembly in a simple and reliable manner. On the other hand, the groove can reduce the material cost of the terminal body and electrode terminals, and also reduce the weight of the terminal body and electrode terminals, thereby reducing the cost of the battery cell and improving the gravimetric energy density of the battery cell.

[0020] By adopting the above method, the projection of the groove along the thickness direction of the reinforcing member can be made to fit within the projection of the through-hole along the thickness direction of the reinforcing member, thereby encouraging that the area where the through-hole is provided is greater than or equal to the area where the groove is provided. Based on this, it can be ensured that the through-hole avoids the bottom portion of the groove, thus avoiding the main part where the terminal body and the electrode assembly are electrically connected. This ensures and improves the convenience of connection between the terminal body and the electrode assembly, and in particular, during the period when the terminal body is electrically connected to the electrode assembly using welding, it is possible to reduce the risk that a part of the reinforcing member will get mixed into the weld joint, form impurities, and affect the welding quality and overcurrent capacity.

[0021] In some embodiments, the battery cell includes an adapter for electrically connecting the electrode assembly to the terminal body, the adapter being connected to an exposed portion through a through-hole in the terminal body.

[0022] By adopting the above method, the electrode assembly is electrically connected via the adapter, and the exposed portion is also electrically connected through the through-hole of the terminal body, thereby establishing a stable and reliable electrical connection between the electrode assembly and the terminal body. Based on this, current collection and overcurrent protection can be achieved between the electrode assembly and the terminal body via the adapter. Furthermore, since the adapter is directly connected to the exposed portion of the terminal body through the through-hole beyond the reinforcing member, the influence of the reinforcing member on the overcurrent capacity between the terminal body and the adapter can be effectively reduced. This is advantageous in ensuring and improving the overcurrent capacity between the terminal body and the electrode assembly.

[0023] In some embodiments, the adapter includes an adapter body and a first protrusion mounted on the adapter body, the first protrusion being drilled in a through hole and connected to a terminal body.

[0024] By adopting the above solution, the adapter can be easily and reliably electrically connected to the tab of the electrode assembly through the adapter body, ensuring and improving the connection convenience, connection reliability and overcurrent capacity between the adapter and the electrode assembly. The adapter is further accurately drilled through the alignment hole by the first convex portion provided on the adapter body, so that it is reliably electrically connected to the portion exposed through the through hole of the terminal body beyond the reinforcing member, thereby ensuring and improving the connection convenience, connection reliability and overcurrent capacity between the adapter and the terminal body.

[0025] Moreover, the adapter can integrate the thicknesses of both the first convex portion and the portion of the adapter body corresponding to the first convex portion, thereby ensuring that the adapter has sufficient thickness to connect to the terminal body, ensuring that a reliable and effective connection can be established between the adapter and the terminal body, ensuring and expanding the effective penetration depth between the adapter and the terminal body, and reducing the risk of phenomena such as separator seizure and soldering defects.

[0026] On the premise that the total thickness of the first convex portion and the portion of the adapter body corresponding to the first convex portion can meet the above requirements, the adapter can correspondingly reduce the thickness of the adapter body and drill at least a part of the first convex portion through the through hole, so that at least a part of the first convex portion can share space with the reinforcing member in the thickness direction of the reinforcing member. Based on this, the extra occupied space on the side of the adapter away from the terminal body of the reinforcing member can be effectively reduced, and the total occupied space of the adapter and the electrode terminal in the housing can be effectively reduced, which is beneficial to improving the volume energy density of the battery cell.

[0027] In some embodiments, a second convex portion is provided on the portion exposed through the through hole of the terminal body, and the second convex portion is drilled through the through hole and connected to the adapter.

[0028] By adopting the above solution, the terminal body is accurately drilled into the through hole by alignment with the second convex portion, so that it is reliably electrically connected to the portion corresponding to the through hole of the adapter beyond the reinforcing member, thereby ensuring and improving the connection convenience, connection reliability and overcurrent capacity between the terminal body and the adapter.

[0029] Moreover, based on the installation of the second convex portion, it can be ensured that there is a sufficient connection thickness between the terminal body and the adapter in the region corresponding to the second convex portion, thereby ensuring that a reliable and effective connection can be established between the terminal body and the adapter, ensuring and expanding the effective penetration depth between the terminal body and the adapter, and reducing the risk of phenomena such as separator seizure and soldering defects.

[0030] The region corresponding to the second convex portion has a sufficient connection thickness and can meet the connection strength requirement. Moreover, the adapter can correspondingly reduce its own thickness. Based on this, the extra occupied space on the side of the reinforcing member of the adapter away from the terminal body can be effectively reduced. In addition, at least a part of the second convex portion is drilled into the through hole, so at least a part of the second convex portion can share space with the reinforcing member in the thickness direction of the reinforcing member. Thereby, the overall occupied space in the housing of the adapter and the electrode terminal can be effectively reduced, which is advantageous for improving the volume energy density of the battery cell.

[0031] In some embodiments, the adapter abuts against the side surface of the reinforcing member away from the terminal body.

[0032] By adopting the above solution, by abutting the adapter against the side surface of the reinforcing member away from the terminal body, the gap space between the adapter and the reinforcing member is compressed, thereby greatly compressing the overall occupied space in the housing of the adapter and the electrode terminal, and ensuring and improving the volume energy density of the battery cell.

[0033] In some embodiments, the adapter is connected to a tab of the electrode assembly and forms a bond mark, and the projection of the reinforcing member and the projection of the bond mark at least partially overlap along the thickness direction of the reinforcing member.

[0034] By adopting the above method, the projection of the reinforcing member along the thickness direction of the reinforcing member and the projection of the joint mark along the thickness direction of the reinforcing member are at least partially overlapped, thereby ensuring that the reinforcing member reinforces the portion of the terminal body corresponding to the joint mark. Based on this, during the service life of the battery cell, particularly during the period when the electrode assembly shakes and impacts are formed on the terminal body via the joint mark, the reinforcing effect of the reinforcing member on the portion of the terminal body corresponding to the joint mark effectively reduces the risk of the terminal body being damaged by impact. This ensures and improves the reliability of the battery cell, and ensures and extends the service life of the electrode terminals and battery cell.

[0035] In some embodiments, a mounting hole is drilled through the first wall, and the terminal body includes a main body, a first flange, and a second flange, the main body being drilled through the mounting hole, the first flange and the second flange being provided at opposite ends of the main body, and the first flange and the second flange fitting together to clamp the first wall.

[0036] By adopting the above method, the terminal body may be drilled into the mounting hole via the main body portion, and the first flange portion and the second flange portion provided at opposite ends of the main body portion will fit together, clamping the first wall together and achieving stable mounting to the mounting hole. Based on this, the mounting reliability between the terminal body and the mounting hole can be effectively improved, the detachment of the terminal body from the mounting hole can be effectively limited, thereby ensuring and improving the reliability of the assembly between the electrode terminal and the first wall, and ensuring and improving the structural reliability of the battery cell.

[0037] In some embodiments, the main body, the first flange, and the second flange are installed as a single unit.

[0038] By adopting the above method, the main body, the first flange, and the second flange can be installed as a single unit, which facilitates the processing and molding of the terminal body, improves the structural reliability of the terminal body, and also improves the convenience and reliability of assembly between the terminal body and the mounting hole.

[0039] In some embodiments, a groove is provided at one end of the main body that is separated from the electrode assembly.

[0040] By adopting the above method, a groove can be installed at one end of the main body away from the electrode assembly. On the one hand, this creates an operating space through the groove, making it easier to perform connection operations on the bottom of the groove from outside the main body, thereby making it easier to establish a simple 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 also reduce the weight of the main body and electrode terminals, thereby reducing the cost of the battery cell and improving the gravimetric energy density of the battery cell.

[0041] In some embodiments, the structural strength of the reinforcing member is greater than the structural strength of the terminal body.

[0042] By adopting the above method, the structural strength of the reinforcing member can be made greater than that of the terminal body, thereby ensuring and improving the reinforcing effect of the reinforcing member on the terminal body, promoting the electrode terminal to achieve superior structural strength through the composite structure of the terminal body and the reinforcing member, thereby ensuring that the electrode terminal meets processing and assembly requirements, ensuring that the electrode terminal can withstand deformation and internal stress during the service life of the battery cell, reducing the risk of stress concentration and cracking due to insufficient structural strength in the electrode terminal, and ensuring and extending the service life of the electrode terminal and battery cell.

[0043] On the other hand, it can encourage the electrode terminals to achieve better structural strength with a smaller thickness, that is, it is advantageous to reduce the thickness of the electrode terminals. Furthermore, as the ratio of the structural strength of the reinforcing member to the structural strength of the terminal body increases, the reinforcing member per unit thickness can provide a better reinforcing effect on the terminal body, thereby allowing the thickness of the terminal body to be reduced and the thickness of the electrode terminals to be reduced. Based on this, the thickness of the electrode terminals can be effectively reduced, which in turn reduces the space occupied by the electrode terminals in the battery cell, thereby advantageous in improving the volumetric energy density of the battery cell.

[0044] A second aspect provides a battery including a battery cell according to an embodiment of the present application.

[0045] By adopting the above method, the battery can improve its volumetric energy density and space utilization rate by applying the battery cell according to the embodiment of this application.

[0046] A third aspect provides a battery according to an embodiment of the present application, or a power consumption device including a battery cell according to an embodiment of the present application.

[0047] By adopting the above-described method, the power consumption device can ensure and improve its performance by applying the battery or battery cell according to the embodiment of this application.

[0048] To clearly illustrate the technical concepts in the embodiments of this application, the following briefly introduces the drawings that may be used in the embodiments or prior art descriptions. It is obvious that the drawings in the following description are only a few embodiments of this application, and those skilled in the art can obtain other drawings based on these without expending any creative effort. [Brief explanation of the drawing]

[0049] [Figure 1] This is a schematic diagram of the structure of a vehicle according to several embodiments of this application. [Figure 2] This is a schematic diagram of a battery exploded according to some embodiments of this application. [Figure 3] This is a schematic diagram of the structure of a battery cell according to several embodiments of this application. [Figure 4] Figure 3 is a front view of the battery cell. [Figure 5] This is a cross-sectional view along AA as shown in Figure 4. [Figure 6] Figure 5 shows an enlarged view of region B. [Figure 7] This is a cross-sectional view of an electrode terminal according to several embodiments of this application. [Figure 8] This is a schematic diagram of the structure of an adapter according to several embodiments of this application. [Figure 9] Figure 8 shows a cross-sectional view of the adapter. [Figure 10] This is a local cross-sectional view of a battery cell according to some other embodiments of the present application. Here, a second protrusion is provided on the portion exposed through the through-hole of the terminal body, and the second protrusion is drilled into the through-hole and connected to an adapter. [Modes for carrying out the invention]

[0050] To clarify the technical problem, technical proposal, and beneficial effects that this application aims to solve, this application will be described in detail with reference to the following drawings and embodiments. It should be understood that the specific embodiments described herein are for interpretation purposes only and do not limit this application.

[0051] In the description of this application, it should be understood that the directions or positional relationships indicated by terms such as "length," "width," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" are directions or positional relationships shown based on the drawings, and are merely for the convenience and simplification of the description in this application. They do not indicate or imply that the mentioned devices or elements have a specific direction or must be configured and operated in a specific direction, and therefore should not be understood as limitations on this application.

[0052] Furthermore, the terms "first" and "second" are merely descriptive and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features being referred to. Thus, features designated as "first" or "second" may explicitly or implicitly include one or at least two such features. In the description of this application, unless otherwise specifically limited, "at least two" means two or more.

[0053] In this application, unless otherwise explicitly defined or limited, terms such as “attachment,” “connection,” “bonding,” and “fixing” should be understood in a broad sense, and may include, for example, a fixed connection, a removable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or an internal communication between two elements or an interaction relationship between two elements. Those skilled in the art will be able to understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0054] A battery cell is the smallest unit for storing and outputting electrical energy. In some cases, a battery cell includes an end cap and electrode terminals, the electrode terminals being attached to the end cap. Here, the end cap is a component that mates with other components to form the internal environment of the battery cell, which is isolated from the external environment. The electrode terminals are stably attached to the end cap and can be used to output or input electrical energy.

[0055] Because electrode terminals are continuously subjected to deformation and internal stress during the lifespan of a battery cell, they are generally required to have relatively high structural strength. The structural strength of the electrode terminals can be strengthened by increasing their thickness, where thickness refers to the size of the electrode terminal in the thickness direction. However, as the thickness of the electrode terminals increases, the volumetric energy density of the battery cell decreases. Therefore, to ensure the volumetric energy density of the battery cell, it is necessary to set a good balance between the thickness and structural strength of the electrode terminals. The structural strength of electrode terminals in conventional battery cells generally deteriorates.

[0056] Accordingly, some embodiments of this application provide a battery cell in which at least one electrode terminal can include a terminal body and a reinforcing member. Based on this, the electrode terminal can be electrically connected to an electrode assembly via a terminal body mounted on a first wall to realize the output or input of electrical energy. The electrode terminal may also be connected to one end of the terminal body along the thickness direction of the terminal body via a reinforcing member, thereby reinforcing the terminal body and ensuring and strengthening the overall structural strength of both the terminal body and the reinforcing member. Based on this, the electrode terminal can achieve superior structural strength through the composite structure of the terminal body and the reinforcing member, thereby ensuring that the electrode terminal can meet processing and assembly requirements and that the electrode terminal can withstand deformation internal stress during the service life of the battery cell, thereby reducing the risk of stress concentration and cracking due to insufficient structural strength in the electrode terminal, and ensuring and extending the service life of the electrode terminal and the battery cell. Furthermore, in addition to achieving superior structural strength, the composite structure of the terminal body and the reinforcing member can also reduce the amplification of the thickness of the electrode terminal, thereby reducing the adverse effect on the volumetric energy density of the battery cell.

[0057] The battery cells disclosed in the embodiments of this application may be lithium-ion secondary battery cells, lithium-sulfur battery cells, sodium lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc. The battery cells may have cylindrical, flattened, rectangular parallelepiped, or other shapes. The battery cells may be formed using different packaging methods, such as columnar battery cells, rectangular battery cells, or pouch battery cells.

[0058] The battery cells disclosed in the embodiments of this application may be used independently or in combination with other battery cells to form a modularized battery, such as a battery module, battery pack, or battery modules, which can provide higher voltage and capacity.

[0059] The battery cells and batteries disclosed in the embodiments of this application can be used in power consumption devices that use battery cells or batteries as a power source, or in various energy storage systems that use battery cells or batteries as energy storage elements. Power consumption devices may be, but are not limited to, vehicles, mobile phones, portable devices, laptop computers, steamships, spacecraft, electric toys, and electric tools. Vehicles may be fuel-oil vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or range-extender vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric steamship toys, and electric airplane toys. Electric tools include metal cutting electric tools, polishing electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, hammer drills, concrete vibrators, and electric planers.

[0060] To describe the technical proposal presented in this application, the following will explain in detail, using the example that "the power consumption device is a vehicle," while linking it with specific drawings and embodiments.

[0061] Referring to Figure 1, which is a schematic diagram of the structure of a vehicle according to some embodiments of the present application. The vehicle may be a fuel oil vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle. A battery 1 is installed inside the vehicle, and the battery 1 may be installed at the bottom, front, or rear of the vehicle. The battery 1 is used to power the vehicle, and for example, the battery 1 can be used as the operating power source for the vehicle. The vehicle may further include a controller 2 and a motor 3, and the controller 2 is used to control the battery 1 to supply power to the motor 3, and is used, for example, for starting the vehicle, navigation, and operating power consumption demands while driving.

[0062] In some embodiments of this application, the battery 1 can be used not only as a power source for operating the vehicle, but also as a power source for driving the vehicle, providing driving power to the vehicle in place of or in place of gasoline or natural gas.

[0063] Referring to Figure 2, which is an exploded schematic diagram of a battery 1 according to some embodiments of the present application, the battery 1 comprises a battery unit 100 and a housing 200, the battery unit 100 being housed within the housing 200, where the housing 200 is used to provide a housing space for the battery unit 100, and the housing 200 may employ various structures. In some embodiments, the housing 200 may include a first part 201 and a second part 202, the first part 201 and the second part 202 overlapping each other, and jointly defining a housing space for housing the battery unit 100. The second part 202 may be a hollow structure with one end open, and the first part 201 may be a plate-like structure, and the first part 201 is placed over the open side of the second part 202 so that the first part 201 and the second part 202 jointly define the housing space, and both the first part 201 and the second part 202 may be hollow structures with one end open, and the open side of the first part 201 is placed over the open side of the second part 202. Of course, the housing 200 formed by the first part 201 and the second part 202 may be of various shapes, such as a cylinder or a rectangular parallelepiped.

[0064] In battery 1, there may be at least two battery units 100, and at least two battery units 100 may be connected in series, in parallel, or in series-parallel, where series-parallel connection means that at least two of the battery units 100 are connected in both series and parallel.

[0065] Specifically, the battery unit 100 may be a battery cell 10 (shown in Figure 3). At least two battery cells 10 may be directly connected in series, parallel, or series-parallel, and the entire unit consisting of at least two battery cells 10 may be housed in a housing 200. Here, the battery cell 10 may 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 may have a cylindrical, flattened, rectangular parallelepiped, or other shape. The battery cell 10 may be formed into a columnar battery cell, a rectangular battery cell, or a pouch battery cell, etc., using different packaging methods.

[0066] Alternatively, the battery unit 100 may be a battery module or a group of battery modules. At least two battery cells 10 may first be connected in series, in parallel, or in series-parallel to form a modular structure, i.e., a battery module or a group of battery modules. At least two battery modules or groups of battery modules may be connected in series, in parallel, or in series-parallel to form a single whole, which may then be housed within the housing 200.

[0067] Of course, the battery 1 may further include other structures, for example, the battery 1 may further include busbar members (not shown) for realizing electrical connections between at least two battery units 100.

[0068] Of course, in some embodiments, the battery 1 may not include a housing 200, and at least two battery cells 10 may be electrically connected and assembled into a power consumption device after being formed as a whole by the necessary fixing structure.

[0069] Referring to Figures 3, 4, and 5, Figure 3 is a schematic diagram of the structure of a battery cell 10 according to some embodiments of the present application, Figure 4 is a front view of the battery cell 10 according to Figure 3, and Figure 5 is a cross-sectional view along AA according to Figure 4. The battery cell 10 is the smallest unit for storing and outputting electrical energy. The battery cell 10 includes components such as a housing 11, electrode terminals 12, an adapter 13, an electrode assembly 15, and an electrolyte (not shown).

[0070] The housing 11 is a component that isolates the internal environment of the battery cell 10 from the external environment. The housing 11 may include a case 111 and an end cap 112. The end cap 112 is a component that is placed over the opening of the case 111 to isolate the internal environment of the battery cell 10 from the external environment. In some embodiments, the shape of the end cap 112 may be adapted to the shape of the case 111 to match the case 111. In some embodiments, the end cap 112 may be manufactured from a material having a certain hardness and strength, so that the end cap 112 is less likely to deform when subjected to extrusion or impact, thereby enabling the battery cell 10 to have higher structural strength and improving safety performance. Here, the material of the end cap 112 can be varied, and the end cap 112 may be manufactured from materials such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0071] The case 111 is a component that fits with the end cap 112 to form the internal environment of the battery cell 10. The internal environment formed by the case 111 fitting with the end cap 112 and enclosing them together may be used to house components such as the electrode assembly 15 and electrolyte. In some embodiments, the case 111 and the end cap 112 may be independent components, or an opening may be provided on the case 111, and the internal environment of the battery cell 10 is formed by covering the opening with the end cap 112 at the opening location. In some embodiments, the end cap 112 and the case 111 may be integrated, specifically, the end cap 112 and the case 111 may first form a common connection surface before other components enter the case, and when it is necessary to package the inside of the case 111, the case 111 is then placed over the end cap 112. Here, the case 111 may have various shapes and sizes, for example, a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, etc. The shape of the case 111 may be determined according to the specific shape and dimensions of the electrode assembly 15. Here, the material of the case 111 may be diverse, and the case 111 may be manufactured from materials such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0072] The electrode assembly 15 is a component in which an electrochemical reaction occurs within the battery cell 10. The housing 11 may contain one or at least two electrode assemblies 15. The electrode assembly 15 includes a positive electrode plate (not shown), a negative electrode plate (not shown), and a separator (not shown), the separator separating the positive electrode plate and the negative electrode plate. The positive electrode plate, separator, and negative electrode plate may be formed by winding, lamination, or other methods. In the electrode assembly 15, the active material portions of both the positive and negative electrode plates constitute the electrode body 151 of the electrode assembly 15, and the non-active material portions of both the positive and negative electrode plates 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 plate is the positive electrode tab 152a, and the tab 152 of the negative electrode plate is the negative electrode tab 152b. The positive electrode tab 152a and the negative electrode tab 152b may both be located at one end of the electrode body 151, or they may be located at both ends of the electrode body 151, respectively.

[0073] The electrolyte is a liquid that permeates the electrode assembly 15. The battery cell 10 operates primarily through the movement of active ions between the positive and negative electrode plates. When the battery cell 10 is charged, the positive electrode plate generates active ions, which are supplied by the positive electrode plate and can move to the negative electrode plate via the electrolyte and be absorbed into the negative electrode active material of the negative electrode plate. Conversely, when the battery cell 10 is discharged, the active ions absorbed into the negative electrode active material of the negative electrode plate are released, and these released ions can move to the positive electrode plate via the electrolyte and be absorbed into the positive electrode active material of the positive electrode plate. Here, the active ions may be lithium ions, sodium ions, or the like.

[0074] The electrode terminals 12 are components electrically connected to the electrode assembly 15 and for outputting or inputting electrical energy. The electrode terminals 12 include 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 terminals 12 are mounted on the housing 11 and may be fixed in position and state relative to the housing 11. In some embodiments, the electrode terminals 12 may be mounted on the housing 11 by a burring crimping method. In some embodiments, an insulating structure 14 is provided in the area where the electrode terminals 12 and the housing 11 are mated. The insulating structure 14 has insulating properties and can insulate the electrode terminals 12 and the housing 11 from each other, thereby reducing the risk of short circuits. Selectively, the insulating structure 14 may include plastic, rubber, or the like.

[0075] The adapter 13 is a current collector that is electrically connected between the tab 152 of the electrode assembly 15 and the corresponding electrode terminal 12. The adapter 13 may also be called an adapter connecting member, current collector panel, or adapter sheet. The adapter 13 has conductive properties and is manufactured from 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 may be electrically connected to the positive electrode terminal 12a via the positive electrode adapter 13a, and the negative electrode tab 152b of the electrode assembly 15 may be electrically connected to the negative electrode terminal 12b via the negative electrode adapter 13b, thereby forming a current circuit. In some embodiments, the adapter 13 may be connected to the tab 152 of the electrode assembly 15 by methods such as welding or abutment. The adapter 13 may be connected to the electrode terminal 12 by methods such as welding or abutment. Here, the shape of the adapter 13 can vary, and may be, for example, square, circular, or irregularly shaped.

[0076] In some embodiments, the housing 11 may be further equipped with a pressure relief mechanism (not shown) for releasing internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold.

[0077] Referring to Figures 3, 5, and 6, some embodiments of the present application provide a battery cell 10 including a housing 11, an electrode assembly 15, and an electrode terminal 12. The housing 11 includes a first wall 113. The electrode assembly 15 is housed within the housing 11. The electrode terminal 12 includes a terminal body 121 and a reinforcing member 122. The terminal body 121 is mounted on the first wall 113 and electrically connected to the electrode assembly 15. The reinforcing member 122 is connected to one end of the terminal body 121 along the thickness direction of the terminal body 121.

[0078] It should be explained 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 a wall portion of the housing 11 for attaching the electrode terminals 12, and the first wall 113 may be the top wall, bottom wall, or side wall of the housing 11. In some embodiments, the housing 11 may include a case 111 and an end cap 112, and if the electrode terminals 12 are attached to the end cap 112, the end cap 112 may be the first wall 113.

[0079] Furthermore, the electrode assembly 15 is a component that generates an electrochemical reaction within the battery cell 10. One or at least two electrode assemblies 15 may be installed in the battery cell 10. The electrode assembly 15 may be housed in an internal space formed by being surrounded by the housing 11. The electrode assembly 15 includes a positive electrode plate, a negative electrode plate, and a separator, the separator separating the positive electrode plate and the negative electrode plate. The positive electrode plate, separator, and negative electrode plate may be processed using a winding method, a lamination method, or other method to form the electrode assembly 15. In the electrode assembly 15, the active material portions of both the positive electrode plate and the negative electrode plate constitute the electrode body 151 of the electrode assembly 15, and the non-active material portions of both the positive electrode plate and the negative electrode plate each constitute a tab 152. The tabs 152 are the current transmission ends of the electrode assembly 15 and are used to transmit current. The tab 152 of the positive electrode plate is the positive electrode tab 152a, and the tab 152 of the negative electrode plate is the negative electrode tab 152b. The positive electrode tab 152a and the negative electrode tab 152b may both be located at one end of the electrode body 151, or they may be located at both ends of the electrode body 151, respectively.

[0080] Furthermore, it should be explained 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.

[0081] The terminal body 121 is a component that has overcurrent capability and primarily serves the purpose of transmitting electrical energy. The terminal body 121 is attached to the first wall 113 and stabilizes its mounting position and mounting state relative to the first wall 113. In some embodiments, the terminal body 121 may be attached to the first wall 113 by a burring crimping method. The terminal body 121 is electrically connected to the tab 152 of the electrode assembly 15. Here, the terminal body 121 may be electrically connected directly to the tab 152 of the electrode assembly 15, or it may be electrically connected to the tab 152 of the electrode assembly 15 via another component that has overcurrent capability. Here, the "other component that has overcurrent capability" may be a reinforcing member 122 that has overcurrent capability, or an adapter 13 that can be a current collector. Of course, the reinforcing member 122 does not have overcurrent capability. Exemplarily, in some embodiments, the reinforcing member 122 does not have overcurrent capability, and the tab 152 of the electrode assembly 15 is electrically connected to the terminal body 121 via the adapter 13.

[0082] The reinforcing member 122 is a member that reinforces the terminal body 121 and improves the overall structural strength of both the terminal body 121 and the reinforcing member 122. The electrode terminal 12 on which the reinforcing member 122 is provided may be a positive electrode terminal 12a or a negative electrode terminal 12b. The material of the reinforcing member 122 may be selected according to the material of the terminal body 121, as long as it is ensured that the reinforcing member 122 can reinforce the terminal body 121. When the reinforcing member 122 is installed on both the positive electrode terminal 12a and the negative electrode terminal 12b, the reinforcing member 122 of the positive electrode terminal 12a and the reinforcing member 122 of the negative electrode terminal 12b may be made of the same material, or different materials may be used for each terminal body 121.

[0083] The reinforcing member 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 reinforcing member 122 may be connected to one end located inside the housing 11 of the terminal body 121, or to one end located outside the housing 11 of the terminal body 121. When the reinforcing member 122 is connected to one end located inside the housing 11 of the terminal body 121, the reinforcing member 122 is provided inside the housing 11 and is permeated with the electrolyte, so the reinforcing member 122 needs to be resistant to electrolyte corrosion. Here, the connection method between the reinforcing member 122 and the terminal body 121 may be welding, adhesive, etc., but is not limited to these. Here, 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.

[0084] In summary, the battery cell 10 according to the embodiment of this application can have at least one electrode terminal 12 comprising 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 attached to the first wall 113 to realize the output or input of electrical energy. The electrode terminal 12 may 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, thereby reinforcing the terminal body 121 and ensuring and strengthening the overall structural strength of both the terminal body 121 and the reinforcing member 122. Based on this, the electrode terminal 12 can achieve superior structural strength through a composite structure of the terminal body 121 and the reinforcing member 122, thereby ensuring that the electrode terminal 12 can meet processing and assembly requirements, and that the electrode terminal 12 can withstand deformation internal stress during the service life of the battery cell 10, thereby reducing the risk of stress concentration and cracking due to insufficient structural strength in the electrode terminal 12, and thus ensuring and extending the service life of both the electrode terminal 12 and the battery cell 10. Furthermore, in addition to achieving superior structural strength, the composite structure of the terminal body 121 and the reinforcing member 122 can also reduce the amplification of the thickness of the electrode terminal 12, thereby reducing the adverse effect on the volumetric energy density of the battery cell 10. Here, the thickness of the electrode terminal 12 refers to the size of the electrode terminal 12 in the thickness direction of the terminal body 121.

[0085] Referring to Figures 5, 6, and 7, in some embodiments of this application, the reinforcing member 122 is connected to one end of the terminal body 121 that is close to the electrode assembly 15.

[0086] It should be explained that the reinforcing member 122 is connected to one end of the terminal body 121 that is close to the electrode assembly 15. That is, along the thickness direction of the terminal body 121, the reinforcing member 122 is connected to one end of the terminal body 121 that is located inside the housing 11. Based on this, the reinforcing member 122 can reinforce the portion of the terminal body 121 that is located inside the housing 11.

[0087] In this embodiment, the reinforcing member 122 may or may not have overcurrent capability. If the reinforcing member 122 has overcurrent capability, the electrode assembly 15 may be electrically connected to the terminal body 121 via the reinforcing member 122, or it may be electrically connected to the terminal body 121 bypassing the reinforcing member 122. If the reinforcing member 122 does not have overcurrent capability, the electrode assembly 15 may be electrically connected to the terminal body 121 while avoiding the reinforcing member 122.

[0088] By adopting the above method, the reinforcing member 122 can be connected to one end of the terminal body 121 that is close to the electrode assembly 15, thereby reinforcing the portion of the terminal body 121 located inside the housing 11 via the reinforcing member 122. Based on this, the overall structural strength of the portion of the electrode terminal 12 located inside the housing 11 can be guaranteed and strengthened, giving the portion of the electrode terminal 12 located inside the housing 11 relatively excellent overall structural strength, allowing it to be processed and reliably fitted with the first wall 113, establishing a reliable electrical connection with the electrode assembly 15, being able to withstand deformation internal stress during the service life of the battery cell 10, and making it less likely for stress concentration and cracking due to insufficient structural strength to occur. Furthermore, it is also advantageous in reducing the amplification of the thickness of the portion of the electrode terminal 12 located inside the housing 11, thereby constraining the space occupied by the electrode terminal 12 inside the housing 11 and reducing the adverse effect on the volumetric energy density of the battery cell 10.

[0089] Of course, in other embodiments, the reinforcing member 122 may be connected to one end of the terminal body 121 that is away from the electrode assembly 15.

[0090] Referring to Figures 5, 6, and 7, in some embodiments of this application, the reinforcing member 122 is connected to the end face of the terminal body 121 that is adjacent to the electrode assembly 15.

[0091] It should be explained that the reinforcing member 122 is connected to one end of the terminal body 121 that is close to the electrode assembly 15, and in particular to the end face of this end of the terminal body 121. Based on this, the reinforcing member 122 can provide a large-area, more uniform, and more effective reinforcement from the end face of the terminal body 121 that is close to the electrode assembly 15 to the portion of the terminal body 121 located inside the housing 11.

[0092] By adopting the above method, the reinforcing member 122 can be connected to the end face of the terminal body 121 adjacent to the electrode assembly 15, thereby improving the convenience and reliability of the connection between the reinforcing member 122 and the terminal body 121. Furthermore, the installation area of ​​the reinforcing member 122 on the end face of the terminal body 121 adjacent to the electrode assembly 15 can be ensured, thereby ensuring that the reinforcing member 122 can provide large-area, more uniform, and more effective reinforcement to the portion of the terminal body 121 located within the housing 11. This is advantageous in ensuring and strengthening the overall structural strength of the portion of the electrode terminal 12 located within the housing 11, and in reducing the amplification of the thickness of the portion of the electrode terminal 12 located within the housing 11 in a balanced manner. This allows for a balanced constraint on the space occupied by the electrode terminal 12 within the housing 11, thereby reducing the adverse effect on the volumetric energy density of the battery cell 10.

[0093] Of course, in other embodiments, the reinforcing member 122 may be connected to other locations, such as the outer circumferential surface of one end of the terminal body 121 that is close to the electrode assembly 15.

[0094] Referring to Figures 5, 6, and 7, in some embodiments of this application, the reinforcing member 122 is provided with a through hole 1221 which penetrates the reinforcing member 122 along the thickness direction of the reinforcing member 122, and at least a portion of the terminal body 121 is exposed through the through hole 1221 and electrically connected to the electrode assembly 15.

[0095] It should be explained that, in particular when the reinforcing member 122 is connected to the end face of the terminal body 121 adjacent to the electrode assembly 15, a through hole 1221 may be provided in the reinforcing member 122. The through hole 1221 may penetrate the reinforcing member 122 along the thickness direction of the reinforcing member 122, that is, the through hole 1221 may penetrate both opposing end faces of the reinforcing member 122 along its own thickness direction. Here, the thickness direction of the reinforcing member 122 is parallel to the central axis of the reinforcing member 122. Based on this, 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 can be exposed through the through hole 1221 without being shielded by the reinforcing member 122. This makes it easier for the terminal body 121 to be electrically connected to the electrode assembly 15 through the exposed portion. Here, the through hole 1221 may be a circular hole, a rectangular hole, etc. The through hole 1221 may be provided at any position on the reinforcing member 122 as needed. This embodiment can be applied interchangeably to cases where "the reinforcing member 122 has overcurrent capability" and cases where "the reinforcing member 122 does not have overcurrent capability."

[0096] By adopting the above method, a through hole 1221 is provided in the reinforcing member 122, allowing at least a portion of the terminal body 121 to be exposed through the through hole 1221 and electrically connected to the electrode assembly 15. Based on this, it is possible to easily establish an electrical connection between the terminal body 121 and the electrode assembly 15 beyond the reinforcing member 122, thereby reducing the influence of the reinforcing member 122 on the overcurrent capacity between the terminal body 121 and the electrode assembly 15, which is advantageous in ensuring and improving the overcurrent capacity between the terminal body 121 and the electrode assembly 15.

[0097] Of course, in other embodiments, even if the reinforcing member 122 is not connected to the end face of the terminal body 121 that is close to the electrode assembly 15, the reinforcing member 122 may have a through hole 1221 as needed. Of course, the reinforcing member 122 does not have to have a through hole 1221.

[0098] Referring to Figures 5, 6, and 7, in some embodiments of this application, the through-hole 1221 is located in the central part of the reinforcing member 122. It should be noted that the through-hole 1221 may be located in the central part of the reinforcing member 122, but is not limited to being exactly in the center.

[0099] By adopting the above method, when the reinforcing member 122 is connected to the end face of the terminal body 121 that is close to the electrode assembly 15, the through hole 1221 is provided in the center of the reinforcing member 122, thereby exposing the central region of the end face of the terminal body 121 that is close to the electrode assembly 15 through the through hole 1221 and enabling electrical connection to the electrode assembly 15. Based on this, it is possible to easily establish an electrical connection relationship between the central region of the end face of the terminal body 121 and the electrode assembly 15 beyond the reinforcing member 122, thereby ensuring and improving the convenience and reliability of the connection between the terminal body 121 and the electrode assembly 15, and optimizing the overcurrent path and overcurrent capacity between the terminal body 121 and the electrode assembly 15.

[0100] Referring to Figures 5, 6, and 7, in some embodiments of this application, a mounting hole 1131 is made 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.

[0101] It should be explained that the first wall 113 is provided with a mounting hole 1131 that penetrates 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 may be a circular hole, a rectangular hole, or the like.

[0102] A through hole 1221 is provided in the reinforcing member 122. Furthermore, along the thickness direction of the reinforcing member 122, the projection of the through hole 1221 lies within the projection of the mounting hole 1131. That is, along the thickness direction of the reinforcing member 122, the projection of the through hole 1221 on the end face of the terminal body 121 that is close to the electrode assembly 15 falls within the range provided by the mounting hole 1131. In other words, the range provided by the through hole 1221 is less than or equal to the range provided by the mounting hole 1131.

[0103] By adopting the above method, the projection of the through-hole 1221 along the thickness direction of the reinforcing member 122 is made to fit within the projection of the mounting hole 1131 along the thickness direction of the reinforcing member 122, thereby encouraging that the area where the through-hole 1221 is provided is less than or equal to the area where the mounting hole 1131 is provided. Based on this, it is possible to ensure that the through-hole 1221 is not provided in the area corresponding to the connection point between the terminal body 121 of the reinforcing member 122 and the mounting hole 1131, and it is possible to ensure that the reinforcing member 122 can reliably reinforce the area where the terminal body 121 and the mounting hole 1131 are connected. This ensures and improves the overall structural strength of the connection point between the electrode terminal 12 and the mounting hole 1131, reduces the risk of stress concentration and cracking due to insufficient structural strength in the area where the electrode terminal 12 and the mounting hole 1131 are connected, and ensures and extends the service life of the battery cell 10.

[0104] Referring to Figures 5, 6, and 7, in some embodiments of this application, a groove 1211 is provided at one end of the terminal body 121 away from the electrode assembly 15.

[0105] It should be explained that one end of the terminal body 121 that is separated from the electrode assembly 15 has a groove 1211, particularly on the end face of the terminal body 121 that is separated from the electrode assembly 15. The groove 1211 is a groove-like structure and may be, but is not limited to, a rectangular groove. The bottom of the groove 1211 may be left as a portion that is electrically connected to the electrode assembly 15 of the terminal body 121. The groove 1211 may also be used to provide an operating space, thereby facilitating the associated connection operation of the bottom of the groove 1211 from outside the terminal body 121.

[0106] By adopting the above method, a groove 1211 is provided at one 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, thereby facilitating connection operations at the bottom of the groove 1211 from outside the terminal body 121, and thus making it easier to establish an electrical connection relationship between the bottom of the groove 1211 and the electrode assembly 15 in a simple and reliable manner. On the other hand, the material cost of the terminal body 121 and the electrode terminal 12 can be reduced through the groove 1211, and the weight of the terminal body 121 and the electrode terminal 12 can be reduced, thereby reducing the cost of the battery cell 10 and improving the gravimetric energy density of the battery cell 10.

[0107] Referring to Figures 5, 6, and 7, in some embodiments of this 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.

[0108] It should be explained that a groove 1211 is provided at one end of the terminal body 121 away from the electrode assembly 15. A through hole 1221 is provided in the reinforcing member 122. 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 that is close to the electrode assembly 15 falls within the projection of the through hole 1221 on the same end face. In other words, the area in which the through hole 1221 is provided is greater than or equal to the area in which the groove 1211 is provided.

[0109] By adopting the above method, the projection of the reinforcing member 122 of the groove 1211 along the thickness direction is made to fit within the projection of the reinforcing member 122 of the through hole 1221 along the thickness direction, thereby encouraging that the area where the through hole 1221 is provided is greater than or equal to the area where the groove 1211 is provided. Based on this, it is possible to ensure that the through hole 1221 avoids the groove bottom portion of the groove 1211, thus avoiding the main part where the terminal body 121 and the electrode assembly 15 are electrically connected. This ensures and improves the convenience of connection between the terminal body 121 and the electrode assembly 15, and in particular, during the period when the terminal body 121 is electrically connected to the electrode assembly 15 using welding, the risk of a part of the reinforcing member 122 getting mixed into the weld joint, forming impurities and affecting the welding quality and overcurrent capability can be reduced.

[0110] Referring to Figures 5, 6, and 7, in some embodiments of this application, a liquid injection hole 1212 communicating with the inside of the housing 11 is provided at the bottom of the groove 1211.

[0111] It should be explained that an injection hole 1212 is provided at the bottom of the groove 1211. The injection hole 1212 communicates with the internal space of the housing 11 from the bottom of the groove 1211, making it easy to inject electrolyte into the housing 11 from the outside of the housing 11 through the injection hole 1212. During the injection period, the groove 1211 can serve as a short-term containment and guide for the electrolyte (similar to a funnel), increasing the operating space for injection and reducing the difficulty of injection. After injection is complete, the injection hole 1212 needs to be closed via a sealant or other material. At this time, the groove 1211 can provide an operating space for closing the injection hole 1212, increasing the operating space for closing the injection hole 1212 and reducing the difficulty of closing the injection hole 1212.

[0112] By adopting the above method, an injection hole 1212 communicating with the inside of the housing 11 is provided at the bottom of the groove 1211. On the one hand, it is possible to easily inject electrolyte into the inside of the housing 11 from the outside of the housing 11 via the injection hole 1212. In particular, during the injection period, the electrolyte can be contained in a short period of time via the groove 1211 and guided to flow into the injection hole 1212, thereby reducing the difficulty of injection and improving the convenience of injection. On the other hand, during the period when injection is completed and the injection hole 1212 is closed with a sealant or other material, the groove 1211 provides an operating space for closing the injection hole 1212, thereby reducing the difficulty of closing the injection hole 1212 and improving the convenience of closing the injection hole 1212.

[0113] Referring to Figures 5, 6, 7, and 8, in some embodiments of the present application, the battery cell 10 includes an adapter 13 for electrically connecting the electrode assembly 15 and the terminal body 121, the adapter 13 being connected to the exposed portion of the terminal body 121 through a through hole 1221.

[0114] It should be explained that the adapter 13 is a current collector that is electrically connected between the electrode assembly 15 and the corresponding electrode terminal 12. Here, the adapter 13 can be connected to the tab 152 of the electrode assembly 15 to achieve an electrical connection with the electrode assembly 15. The adapter 13 may also be connected to an exposed portion through the through hole 1221 of the terminal body 121 to achieve an electrical connection with the electrode terminal 12.

[0115] By adopting the above method, the electrode assembly 15 is electrically connected via the adapter 13, and the exposed portion of the terminal body 121 is also electrically connected via 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, current collection and overcurrent protection can be achieved between the electrode assembly 15 and the terminal body 121 via the adapter 13. Furthermore, since the adapter 13 is directly connected to the exposed portion of the terminal body 121 via the through hole 1221, beyond the reinforcing member 122, the influence of the reinforcing member 122 on the overcurrent capacity between the terminal body 121 and the adapter 13 can be effectively reduced. This is advantageous in ensuring and improving the overcurrent capacity between the terminal body 121 and the electrode assembly 15.

[0116] Referring to Figures 5, 6, 8, and 9, in some embodiments of this application, the adapter 13 includes an adapter body 131 and a first protrusion 132 installed on the adapter body 131, the first protrusion 132 being drilled in a through hole 1221 and connected to a terminal body 121.

[0117] It should be explained that the adapter body 131 is the part of the adapter 13 that is electrically connected to the electrode assembly 15. The adapter body 131 may be installed on the side of the reinforcing member 122 that is away from the terminal body 121. The first protrusion 132 is a projection structure installed on the side of the adapter body 131 that is close to the electrode terminal 12 and protrudes toward the terminal body 121. The first protrusion 132 may be drilled in the through hole 1221 of the reinforcing member 122 and is electrically connected to the portion of the terminal body 121 that is exposed through the through hole 1221.

[0118] By adopting the above method, the adapter 13 can be easily and reliably electrically connected to the tab 152 of the electrode assembly 15 via the adapter body 131, thereby ensuring and improving the convenience of connection, connection reliability, and overcurrent capability between the adapter 13 and the electrode assembly 15. The adapter 13 is further aligned and precisely drilled into the through hole 1221 by the first protrusion 132 installed on the adapter body 131, thereby ensuring a reliable electrical connection to the portion of the terminal body 121 exposed through the through hole 1221 beyond the reinforcing member 122, thereby ensuring and improving the convenience of connection, connection reliability, and overcurrent capability between the adapter 13 and the terminal body 121.

[0119] Furthermore, by combining the thickness of the first protrusion 132 and the portion of the adapter body 131 corresponding to the first protrusion 132, the adapter 13 can be ensured to have sufficient thickness to connect to the terminal body 121. This ensures a secure and effective connection between the adapter 13 and the terminal body 121, and ensures and increases the effective penetration depth between the adapter 13 and the terminal body 121, thereby reducing the risk of phenomena such as separator burning and solder defects.

[0120] The combined thickness of the first protrusion 132 and the portion of the adapter body 131 corresponding to the first protrusion 132 can satisfy the above requirements. Furthermore, the adapter 13 can be made thinner in the adapter body 131 accordingly, and at least a portion of the first protrusion 132 can be drilled into the through hole 1221, thereby allowing at least a portion of the first protrusion 132 to share space with the reinforcing member 122 in the thickness direction of the reinforcing member 122. Based on this, the extra space occupied by the adapter 13 on the side of the reinforcing member 122 away from the terminal body 121 can be effectively reduced, and the overall space occupied by the adapter 13 and the electrode terminal 12 within the housing 11 can be effectively reduced, which is advantageous in improving the volumetric energy density of the battery cell 10.

[0121] Here, the thickness of the first protrusion 132 is the size of the first protrusion 132 in the thickness direction of the adapter 13, the thickness of the adapter body 131 is the size 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.

[0122] Referring to Figure 10, in some embodiments of this application, a second protrusion 1216 is provided on the portion of the terminal body 121 exposed through the through hole 1221, and the second protrusion 1216 is drilled in the through hole 1221 and connected to the adapter 13.

[0123] It should be explained that the second protrusion 1216 is a projection structure that is installed on the portion exposed through the through-hole 1221 of the terminal body 121 and protrudes toward the adapter 13. The second protrusion 1216 may also be drilled in the through-hole 1221 of the reinforcing member 122 and is electrically connected to the portion of the adapter 13 corresponding to the through-hole 1221.

[0124] By adopting the above method, the terminal body 121 is precisely positioned and drilled into the through hole 1221 by the second protrusion 1216, thereby ensuring electrical connection beyond the reinforcing member 122 to the portion of the adapter 13 corresponding to the through hole 1221. This ensures and improves the convenience of connection, connection reliability, and overcurrent capability between the terminal body 121 and the adapter 13.

[0125] Furthermore, based on the installation of the second protrusion 1216, it is possible to ensure that there is sufficient connection thickness between the terminal body 121 and the adapter 13 in the region corresponding to the second protrusion 1216, thereby ensuring that a reliable and effective connection can be established between the terminal body 121 and the adapter 13, ensuring and increasing the effective penetration depth between the terminal body 121 and the adapter 13, and reducing the risk of phenomena such as separator burning and solder defects occurring.

[0126] The region corresponding to the second protrusion 1216 has sufficient connection thickness to meet the connection strength requirements, and the adapter 13 can be made thinner accordingly. Based on this, the extra space occupied by the reinforcing member 122 of the adapter 13 on the side away from the terminal body 121 can be effectively reduced. Also, since at least a portion of the second protrusion 1216 is drilled in the through hole 1221, at least a portion of the second protrusion 1216 can share space with the reinforcing member 122 in the thickness direction of the reinforcing member 122. This effectively reduces the overall space occupied by the adapter 13 and the electrode terminal 12 within the housing 11, which is advantageous in improving the volumetric energy density of the battery cell 10.

[0127] Here, the thickness of the second protrusion 1216 is the size of the second protrusion 1216 in the thickness direction of the terminal body 121.

[0128] Referring to Figures 6 and 10, in some embodiments of this application, the adapter 13 abuts against the side of the reinforcing member 122 that is away from the terminal body 121.

[0129] As explained in Figure 6, the adapter 13 includes an adapter body 131 and a first protrusion 132. When the first protrusion 132 is drilled in a through hole 1221 and connected to the terminal body 121, by making the thickness of the first protrusion 132 less than or equal to the thickness of the reinforcing member 122, the entire first protrusion 132 can share space with the reinforcing member 122 in the thickness direction of the reinforcing member 122, thereby allowing the adapter body 131 of the adapter 13 to abut against the side of the reinforcing member 122 away from the terminal body 121. In particular, when the thickness of the first protrusion 132 is equal to the thickness of the reinforcing member 122, and the total thickness of the first protrusion 132 and the portion of the adapter body 131 corresponding to the first protrusion 132 is a determined value, the thickness of the adapter body 131 may be equal to the total thickness minus the thickness of the reinforcing member 122. That is, the thickness of the adapter body 131 can be accurately reduced based on the difference between the total thickness and the thickness of the reinforcing member 122.

[0130] 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 drilled in the through hole 1221 and connected to the adapter 13, by making the thickness of the second protrusion 1216 less than or equal to the thickness of the reinforcing member 122, the entire second protrusion 1216 can share space with the reinforcing member 122 in the thickness direction of the reinforcing member 122, thereby allowing the adapter 13 to abut against the side of the reinforcing member 122 away from the terminal body 121.

[0131] Here, the thickness of the reinforcing member 122 is the size of the reinforcing member 122 in the thickness direction.

[0132] By adopting the above method, the adapter 13 is brought into contact with the side of the reinforcing member 122 that is away from the terminal body 121, thereby compressing the gap space between the adapter 13 and the reinforcing member 122. This significantly reduces the overall space occupied by the adapter 13 and the electrode terminal 12 within the housing 11, thereby ensuring and improving the volumetric energy density of the battery cell 10.

[0133] 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 is drilled into the through hole 1221, but a portion of the first protrusion 132 can be 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 is drilled into the through hole 1221, but a portion of the second protrusion 1216 can be exposed outside the through hole 1221.

[0134] Referring to Figures 5 and 6, in some embodiments of this application, the adapter 13 is connected to the tab 152 of the electrode assembly 15 and forms a joint mark 133. Along the thickness direction of the reinforcing member 122, the projection of the reinforcing member 122 and the projection of the joint mark 133 overlap at least partially.

[0135] It should be explained that the adapter 13 may, but is not limited to, be connected to the tab 152 of the electrode assembly 15 by a method such as welding. After connection, a joint mark 133 may be formed at the connection point between the adapter 13 and the tab 152. When the adapter 13 and the tab 152 are welded, the joint mark 133 is a weld mark.

[0136] Along the thickness direction of the reinforcing member 122, the projection of the reinforcing member 122 and the projection of the joint mark 133 overlap at least partially. 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 that is close to the electrode assembly 15 overlaps with the joint mark 133.

[0137] By adopting the above method, the projection of the reinforcing member 122 along the thickness direction of the reinforcing member 122 and the projection of the joint mark 133 along the thickness direction of the reinforcing member 122 are at least partially overlapped, thereby ensuring that the reinforcing member 122 reinforces the portion of the terminal body 121 corresponding to the joint mark 133. Based on this, during the service life of the battery cell 10, particularly during the period when the electrode assembly 15 shakes and impacts are formed on the terminal body 121 via the joint mark 133, the reinforcing effect of the reinforcing member 122 on the portion of the terminal body 121 corresponding to the joint mark 133 effectively reduces the risk of the terminal body 121 being damaged by impact. This ensures and improves the reliability of the battery cell 10, and ensures and extends the service life of the electrode terminal 12 and the battery cell 10.

[0138] Referring to Figures 5, 6, and 7, in some embodiments of this application, a mounting hole 1131 is provided through the first wall 113. The terminal body 121 includes a body portion 1213, a first flange portion 1214, and a second flange portion 1215. The body portion 1213 is drilled through the mounting hole 1131. The first flange portion 1214 and the second flange portion 1215 are provided at opposite ends of the body portion 1213, respectively, and the first flange portion 1214 and the second flange portion 1215 fit together to clamp the first wall 113.

[0139] It should be explained that the first wall 113 is provided with a mounting hole 1131 that penetrates 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 may be a circular hole, a rectangular hole, or the like.

[0140] Furthermore, the terminal body 121 includes a main body portion 1213, a first flange portion 1214, and a second flange portion 1215. Here, the main body portion 1213 is the portion drilled in the mounting hole 1131 of the terminal body 121. The main body portion 1213 is drilled in the mounting hole 1131, and the mounting hole 1131 can restrict the position of the main body portion 1213 in the circumferential direction.

[0141] The first flange portion 1214 is connected to one end of the main body portion 1213 and protrudes from the outer circumferential surface of the main body portion 1213. The first flange portion 1214 is fixed in position by being locked into one side of the mounting hole 1131 and may abut against one side of the first wall 113 along the thickness direction of the first wall 113. Accordingly, the second flange portion 1215 is connected to the other end of the main body portion 1213 and protrudes from the outer circumferential surface of the main body portion 1213. The second flange portion 1215 is fixed in position by being locked into the other side of the mounting hole 1131 and may abut against the other side of the first wall 113 along the thickness direction of the first wall 113. The first flange portion 1214 and the second flange portion 1215 are fitted together, both sandwiching the first wall 113 between them, thereby restricting the terminal body 121 from detaching from the mounting hole 1131, that is, restricting the electrode terminal 12 from detaching from the first wall 113.

[0142] By adopting the above method, the terminal body 121 may be drilled into the mounting hole 1131 via the main body portion 1213, and the first flange portion 1214 and the second flange portion 1215 provided at opposite ends of the main body portion 1213 will fit together, clamping the first wall 113 and achieving stable mounting to the mounting hole 1131. Based on this, the mounting reliability between the terminal body 121 and the mounting hole 1131 can be effectively improved, and the terminal body 121 can be effectively prevented from coming out of the mounting hole 1131, thereby ensuring and improving the reliability of the assembly between the electrode terminal 12 and the first wall 113, and ensuring and improving the structural reliability of the battery cell 10.

[0143] Of course, in other embodiments, the terminal body 121 may adopt other structural forms.

[0144] Referring to Figures 5, 6, and 7, in some embodiments of this application, the main body 1213, the first flange portion 1214, and the second flange portion 1215 are installed as a single unit.

[0145] It should be explained that the main body 1213, the first flange portion 1214, and the second flange portion 1215 are installed integrally, that is, the main body 1213, the first flange portion 1214, and the second flange portion 1215 are an integrated structure. In some embodiments, the terminal body 121 can be attached to the mounting hole 1131 by a burring crimping method, and the main body 1213, the first flange portion 1214, and the second flange portion 1215 can be formed on the terminal body 121.

[0146] By adopting the above method, the main body 1213, the first flange portion 1214, and the second flange portion 1215 are installed as a single unit, which facilitates the processing and molding of the terminal body 121, is advantageous in improving the structural reliability of the terminal body 121, and is also advantageous in improving the convenience and reliability of assembly between the terminal body 121 and the mounting hole 1131.

[0147] Referring to Figures 5, 6, and 7, in some embodiments of this application, a groove 1211 is provided at one end of the main body 1213 that is separated from the electrode assembly 15.

[0148] It should be explained that a groove 1211 is provided on one end of the main body 1213 away from the electrode assembly 15, particularly on the end face of the main body 1213 away from the electrode assembly 15. The groove 1211 is a groove-like structure and may be, but is not limited to, a rectangular groove. The bottom of the groove 1211 may be left as a portion electrically connected to the electrode assembly 15 of the main body 1213. The groove 1211 may also be used to provide an operating space, thereby facilitating the associated connection operation of the groove bottom of the groove 1211 from outside the main body 1213.

[0149] By adopting the above method, a groove 1211 can be placed at one 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, thereby facilitating connection operations at the bottom of the groove 1211 from outside the main body 1213, and thus making it easier to establish a simple and reliable electrical connection between the bottom of the groove 1211 and the electrode assembly 15. On the other hand, the material cost of the main body 1213 and the electrode terminals 12 can be reduced through the groove 1211, and the weight of the main body 1213 and the electrode terminals 12 can be reduced, thereby reducing the cost of the battery cell 10 and improving the gravimetric energy density of the battery cell 10.

[0150] In some embodiments, insulating structures 14 are installed between the main body 1213 and the first wall 113, between the first flange portion 1214 and the first wall 113, and between the second flange portion 1215 and the first wall 113 to insulate the terminal body 121 and the first wall 113 from each other.

[0151] Referring to Figures 5, 6, and 7, in some embodiments of this application, the structural strength of the reinforcing member 122 is greater than that of the terminal body 121.

[0152] It should be explained that the structural strength of the reinforcing member 122 is greater than the structural strength of the terminal body 121. In other words, the structural strength of the material of the reinforcing member 122 is greater than the structural strength of the material of the terminal body 121.

[0153] In some embodiments, the electrode terminal 12 to which the reinforcing member 122 is provided may be a positive electrode terminal 12a for electrical connection to the positive electrode tab 152a of the electrode assembly 15. The material of the terminal body 121 of the positive electrode terminal 12a may include aluminum, an aluminum alloy, and 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 a material with greater structural strength.

[0154] In some embodiments, the electrode terminal 12 to which the reinforcing member 122 is provided may be a negative electrode terminal 12b for electrical connection to the negative electrode tab 152b of the electrode assembly 15. The material of the terminal body 121 of the negative electrode terminal 12b may include copper, a copper alloy, and 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 a material with greater structural strength.

[0155] In this case, when reinforcing members 122 are installed on both the positive electrode terminal 12a and the negative electrode terminal 12b, the reinforcing member 122 of the positive electrode terminal 12a and the reinforcing member 122 of the negative electrode terminal 12b may be made of the same material, or they may be made of different materials than their respective terminal bodies 121.

[0156] By adopting the above method, the structural strength of the reinforcing member 122 can be made greater than that of the terminal body 121, thereby ensuring and improving the reinforcing effect of the reinforcing member 122 on the terminal body 121, promoting the electrode terminal 12 to achieve superior structural strength through the composite structure of the terminal body 121 and the reinforcing member 122, thereby ensuring that the electrode terminal 12 meets processing and assembly requirements, ensuring that the electrode terminal 12 can withstand deformation and internal stress during the service life of the battery cell 10, reducing the risk of stress concentration and cracking due to insufficient structural strength in the electrode terminal 12, and ensuring and extending the service life of the electrode terminal 12 and the battery cell 10.

[0157] On the other hand, it is possible to encourage the electrode terminal 12 to achieve better structural strength with a smaller thickness, that is, it is advantageous to reduce 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 per unit thickness can provide a better reinforcing effect to the terminal body 121, thereby allowing the thickness of the terminal body 121 to be reduced and the thickness of the electrode terminal 12 to be reduced. Based on this, the thickness of the electrode terminal 12 can be effectively reduced, and accordingly the space occupied by the electrode terminal 12 in the battery cell 10 can be reduced, which is advantageous in improving the volumetric energy density of the battery cell 10.

[0158] Referring to Figures 5, 6, and 7, in some embodiments of this application, the reinforcing member 122 includes at least one of steel, titanium, and tungsten.

[0159] By adopting the above method, the reinforcing member 122 can be made to have superior structural strength by including at least one of steel, titanium, and tungsten, providing effective and reliable reinforcement to the terminal body 121, which is advantageous for reducing the thickness of the electrode terminal 12 and for improving the volumetric energy density of the battery cell 10.

[0160] Of course, in other embodiments, the reinforcing member 122 may be made of a different material.

[0161] Referring to Figures 3 to 9, and combining the above embodiments, the embodiments of this application hereby provide a specific example of a battery cell 10.

[0162] The battery cell 10 includes a housing 11, electrode terminals 12, an adapter 13, and an electrode assembly 15. The housing 11 includes a first wall 113 through which a mounting hole 1131 passes. The electrode terminal 12 includes a terminal body 121 and a reinforcing member 122. The terminal body 121 includes a main body portion 1213, a first flange portion 1214, and a second flange portion 1215. The main body portion 1213 is drilled through the mounting hole 1131. The first flange portion 1214 and the second flange portion 1215 are provided at opposite ends of the main body portion 1213, respectively. The first flange portion 1214 is located outside the first wall 113, and the second flange portion 1215 is located inside the first wall 113. The first flange portion 1214 and the second flange portion 1215 fit together to clamp the first wall 113. A groove 1211 is provided in the first flange portion 1214, and a liquid injection hole 1212 communicating with the inside of the housing 11 is provided at the bottom of the groove 1211. Here, the terminal body 121 may be attached to the mounting hole 1131 by a burring crimping method, and the main body portion 1213, the first flange portion 1214, and the second flange portion 1215 may be formed.

[0163] The reinforcing member 122 is connected to the end face of the second flange portion 1215 that is separated from the first flange portion 1214. The structural strength of the reinforcing member 122 is greater than that of the terminal body 121, and both the reinforcing member 122 and the terminal body 121 are resistant to corrosion by the electrolyte. A through hole 1221 is provided in the center of the reinforcing member 122. The through hole 1221 penetrates the reinforcing member 122 along the thickness direction of the reinforcing member 122. 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, and the projection of the groove 1211 is located within the projection of the through hole 1221. The central region of the end face of the second flange portion 1215 is exposed through the through hole 1221.

[0164] The adapter 13 includes an adapter body 131 and a first protrusion 132. The adapter body 131 is installed on the side of the reinforcing member 122 away from the terminal body 121. The first protrusion 132 is installed on the side of the adapter body 131 facing the terminal body 121. The first protrusion 132 is drilled in the through hole 1221 of the reinforcing member 122 and is electrically connected to the end face region 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 reinforcing member 122. The adapter body 131 abuts against the side of the reinforcing member 122 away from the terminal body 121.

[0165] The electrode assembly 15 is located on the side of the adapter 13 away from the electrode terminals 12. The tab 152 of the electrode assembly 15 is connected to the adapter body 131 and forms a joint mark 133. Along the thickness direction of the reinforcing member 122, the projection of the reinforcing member 122 and the projection of the joint mark 133 overlap at least partially.

[0166] Based on the above installation, the reinforcing member 122 can reinforce the terminal body 121, and in particular the second flange portion 1215, ensuring and strengthening the overall structural strength of the reinforcing member 122 and the second flange portion 1215, and ensuring and strengthening the overall structural strength of the reinforcing member 122 and the terminal body 121. As a result, the reinforcing action of the reinforcing member 122 allows the electrode terminal 12, especially the reinforcing member 122 and the second flange portion 1215, to have relatively excellent overall structural strength, enabling processing processes such as burring and crimping, establishing a reliable electrical connection with the electrode assembly 15, withstanding deformation and internal stress during the service life of the battery cell 10, and making it less likely for stress concentration and cracking due to insufficient structural strength to occur.

[0167] While ensuring that the overall structural strength of the electrode terminal 12 can meet the above requirements, the thickness of the electrode terminal 12 can be reduced, in particular the thickness of the second flange portion 1215, and the total thickness of both the reinforcing member 122 and the second flange portion 1215 can be reduced. That is, the composite structure of the terminal body 121 and the reinforcing member 122 allows the electrode terminal 12 to achieve better structural strength with a smaller 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 per unit thickness can provide a better reinforcing effect to the terminal body 121, thereby allowing the terminal body 121, especially the second flange portion 1215, to be made thinner, and the thickness of the electrode terminal 12 to be made thinner. This makes it possible to reduce the thickness of the electrode terminal 12, thereby reducing the space occupied by the electrode terminal 12 inside the housing 11 and improving the volumetric energy density of the battery cell 10.

[0168] In one specific application example, the terminal body 121 is made of aluminum, and the reinforcing member 122 is made of steel. Depending on the ratio of the structural strength of steel to that of aluminum, 0.1 mm of steel can replace 0.3 mm to 0.4 mm of aluminum. Based on this, this example uses a 0.4 mm aluminum second flange portion 1215 and combines it with a 0.2 mm steel reinforcing member 122 to ensure that the thickness of the second flange portion 1215 is sufficient to meet the electrical connection requirements, and that the overall structural strength of the reinforcing member 122 and the second flange portion 1215 is sufficient to meet the above requirements. As a result, compared to an electrode terminal 12 where the reinforcing member 122 is not installed and the second flange portion 1215 needs to be at least 1.0 mm thick to ensure strength, the portion of the electrode terminal 12 provided within the housing 11 in this example can be made at least 0.4 mm thinner.

[0169] Based on the above installation, 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 is drilled in the through hole 1221 and can be electrically connected to the second flange portion 1215 of the terminal body 121, passing through the reinforcing member 122. This ensures that the electrode assembly 15 can form a reliable electrical connection with the terminal body 121 via the adapter 13, reduces the influence of the reinforcing member 122 on overcurrent between the electrode assembly 15, adapter 13 and the terminal body 121, ensures and improves the overcurrent capacity between the electrode assembly 15, adapter 13 and the terminal body 121, and ensures the performance of the battery cell 10.

[0170] Based on the above installation, the combined thickness of the first protrusion 132 and the adapter body 131 in the portion of the adapter body 131 corresponding to the first protrusion 132 ensures that the adapter 13 has sufficient connection thickness, ensures that the adapter 13 can establish a secure and effective connection with the terminal body 121, establish a secure and effective connection with the electrode assembly 15, expands the effective penetration depth, and reduces the risk of phenomena such as separator burning and solder defects occurring.

[0171] The combined thickness of the first protrusion 132 and the portion of the adapter body 131 corresponding to the first protrusion 132 can satisfy the above requirements, and the thickness of the adapter body 131 can be reduced accordingly. Furthermore, the first protrusion 132 can be drilled into the through hole 1221, thereby allowing the first protrusion 132 to share space with the reinforcing member 122 in the thickness direction. This effectively reduces the extra space occupied by the reinforcing member 122 of the adapter 13 on the side away from the terminal body 121, effectively reducing the overall 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.

[0172] In one specific application example, a 0.2 mm thick steel reinforcing member 122 is used. Accordingly, the thickness of the first protrusion 132 of the adapter 13 is set to 0.2 mm. In the portion of 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 0.4 mm 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, i.e., 0.2 mm. As a result, when the first protrusion 132 is drilled in the through hole 1221, the adapter 13 requires that only the adapter body 131 occupy extra space on the side away from the terminal body 121 of the reinforcing member 122. In the case of the adapter 13, which does not have a first protrusion 132 and requires a thickness of at least 0.4 mm to ensure connection, the portion of the reinforcing member 122 of the adapter 13 in this example that is provided on the side away from the terminal body 121 can be made at least 0.2 mm thinner.

[0173] Referring to Figures 2 and 3, some embodiments of this application provide a battery 1, which includes a battery cell 10 according to an embodiment of this application.

[0174] By adopting the above method, the volumetric energy density and space utilization rate of the battery 1 can be improved by applying the battery cell 10 according to the embodiment of this application.

[0175] Referring to Figures 1 and 3, some embodiments of this application provide a power consumption device including a battery 1 or a battery cell 10 according to an embodiment of this application.

[0176] By adopting the above method, the power consumption device can ensure and improve its performance by applying the battery 1 or battery cell 10 according to the embodiment of this application.

[0177] The foregoing is merely a preferred embodiment of the present application and is not intended to limit it. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application should all be included within the scope of protection. [Explanation of Symbols]

[0178] 1-Battery, 2-Controller, 3-Motor, 100-Battery Unit, 200-Housing, 201-First Part, 202-Second Part 10-Battery cell, 11-Housing, 111-Case, 112-End cap, 113-First wall, 1131-Mounting hole, 12-Electrode terminal, 12a-Positive electrode terminal, 12b-Negative electrode terminal, 121-Terminal body, 1211-Recessed groove, 1212-Injection hole, 1213-Main body, 1214-First flange, 1215-Second flange, 1216-Second protrusion, 122-Reinforcement member, 1221-Through hole, 13-Adapter, 13a-Positive electrode adapter, 13b-Negative electrode adapter, 131-Adapter body, 132-First protrusion, 133-Joint mark, 14-Insulating structure, 15-Electrode assembly, 151-Electrode body, 152-Tab, 152a-Positive electrode tab, 152b-Negative electrode tab.

Claims

1. It is a battery cell, The housing including the first wall, An electrode assembly housed within the housing, A battery cell comprising an electrode terminal including a terminal body and a reinforcing member, wherein the terminal body is mounted on the first wall and electrically connected to the electrode assembly, and the reinforcing member 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 member is connected to one end of the terminal body adjacent to the electrode assembly.

3. The battery cell according to claim 2, wherein the reinforcing member is connected to the end face of the terminal body adjacent to the electrode assembly.

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

5. The battery cell according to claim 4, wherein the through hole is located in the central part of the reinforcing member.

6. A mounting hole is made through the first wall, and the terminal body is attached to the mounting hole. The battery cell according to claim 4 or 5, wherein the projection of the through hole is located within the projection of the mounting hole along the thickness direction of the reinforcing member.

7. A groove is provided at one end of the terminal body that is separated from the electrode assembly. The battery cell according to claim 4 or 5, wherein the projection of the groove is located within the projection of the through hole along the thickness direction of the reinforcing member.

8. The battery cell according to claim 4 or 5, wherein the battery cell includes an adapter, the adapter is used to electrically connect the electrode assembly and the terminal body, and the adapter is connected to the portion of the terminal body exposed through the through hole.

9. The adapter includes an adapter body and a first protrusion installed on the adapter body, the first protrusion being drilled in the through hole and connected to the terminal body. Alternatively, the battery cell according to claim 8, wherein a second protrusion is provided on the portion of the terminal body exposed through the through hole, and the second protrusion is drilled in the through hole and connected to the adapter.

10. The battery cell according to claim 9, wherein the adapter abuts against the side of the reinforcing member that is separated from the terminal body.

11. The adapter is connected to the tab of the electrode assembly and forms a bonding mark. The battery cell according to claim 8, wherein the projection of the reinforcing member and the projection of the joint mark overlap at least partially along the thickness direction of the reinforcing member.

12. A mounting hole is made through the first wall. The battery cell according to any one of claims 1 to 5, wherein the terminal body includes a main body portion, a first flange portion, and a second flange portion, the main body portion is drilled in the mounting hole, the first flange portion and the second flange portion are provided at opposite ends of the main body portion, and the first flange portion and the second flange portion fit together 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 installed integrally.

14. The battery cell according to claim 12, wherein a groove is provided at one end of the main body that is separated from the electrode assembly.

15. The battery cell according to any one of claims 1 to 5, wherein the structural strength of the reinforcing member is greater than the structural strength of the terminal body.

16. A battery, comprising the battery cell described in claim 1.

17. A power consumption device comprising the battery described in claim 16, or the battery cell described in claim 1.

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