Battery cells and batteries having them, power consumption devices

Abstract

A battery cell and a battery having the same, and a power consumption device, wherein the battery cell includes a housing including a mounting wall, an electrode assembly provided in the housing, an explosion-proof valve provided in the mounting wall, and a gas guide section including a gas guide groove opened in the mounting wall, the gas guide groove being used to guide gas generated from the electrode assembly to the explosion-proof valve. In the technical solution of the embodiment of the present application, the air inside the housing can be guided to flow to the explosion-proof valve, the provision of a gas guide groove in the mounting wall helps to improve the exhaust efficiency of the battery cell and improve the depressurization efficiency of the battery cell, and compared to providing a gas guide assembly alone inside the battery cell, opening a gas guide groove in the mounting wall to form a gas guide section helps to reduce the space occupied by the gas guide section within the battery cell.

Description

Technical Field

[0001] Cross - reference to Related Applications This application is filed based on the Chinese patent application with application number 202311309420.3 and filing date October 10, 2023, and claims the priority of the Chinese patent application. All the contents of the Chinese patent application are incorporated herein by reference.

[0002] This application relates to the field of battery technology, specifically to battery cells, batteries having the battery cells, and power consumption devices.

Background Art

[0003] Energy conservation and emission reduction are key points in the sustainable development of the automotive industry. Electric vehicles, due to their advantages of energy conservation and environmental friendliness, have become an important component in the sustainable development of the automotive industry. For electric vehicles, battery technology is an important factor related to their development. In related technologies, when thermal runaway occurs in a battery cell, the pressure reduction speed of the battery cell is slow.

Summary of the Invention

Means for Solving the Problems

[0004] In view of the above problems, this application provides a battery cell, a battery having the same, and a power consumption device. By providing a gas flow guiding groove on the mounting wall, the gas flow guiding groove can guide the air in the housing to flow to the explosion - proof valve, improve the exhaust efficiency of the battery cell, achieve rapid pressure reduction of the battery cell, and compared with separately providing a gas flow guiding assembly inside the battery cell, forming a gas flow guiding part by opening a gas flow guiding groove on the mounting wall helps to reduce the occupied space of the gas flow guiding part inside the battery cell.

[0005] In a first aspect, the present invention provides a battery cell comprising a housing including a mounting wall, an electrode assembly provided within the housing, an explosion-proof valve provided on the mounting wall, and a gas guide section including a gas guide groove opened in the mounting wall, wherein the gas guide groove is used to guide gas generated from the electrode assembly to the explosion-proof valve.

[0006] In the technical solution of the embodiment of the present application, both the gas guide groove and the explosion-proof valve are provided in the mounting wall, and the gas guide groove is provided near the explosion-proof valve, so that the gas guide groove can easily and quickly guide the gas to the vicinity of the explosion-proof valve. Furthermore, when the gas inside the battery cell reaches a critical value, the gas is quickly collected near the explosion-proof valve and breaks through the explosion-proof valve, enabling rapid depressurization of the battery cell. Compared to providing a gas guide assembly alone inside the battery cell, forming a gas guide section by opening a gas guide groove in the mounting wall helps to reduce the space occupied by the gas guide section within the battery cell.

[0007] In some embodiments, the explosion-proof valve includes a pressure-reducing groove formed in the mounting wall. In the above technical solution, by providing a pressure-reducing groove in the mounting wall, a wall surface with low structural strength can be formed in the mounting wall. When the gas pressure inside the battery cell reaches a critical value, the gas will preferentially penetrate the wall surface with low structural strength in the mounting wall, further destroying the explosion-proof valve, and creating communication between the inside of the battery cell and the external environment, allowing the gas inside the battery cell to reach the external environment, thereby achieving pressure reduction in the battery cell.

[0008] In some embodiments, the depth of the gas flow groove is smaller than the depth of the pressure-reducing groove. In the above technical solution, when the gas pressure in the battery cell reaches a critical value, the gas preferentially penetrates the wall portion of the mounting wall opposite the pressure-reducing groove, reducing the possibility of the gas penetrating the wall portion of the mounting wall opposite the gas flow groove, thereby reducing the influence of the gas flow groove on the explosion-proof valve.

[0009] In some embodiments, both the gas guide groove and the pressure reducing groove are provided on the side of the mounting wall facing the inner cavity of the housing. In the above technical solution, the gas guide groove and the pressure reducing groove are located on the same side, so that the gas guide groove can guide the gas into the pressure reducing groove, the gas is uniformly distributed within the pressure reducing groove, and the gas is uniformly collected at the explosion-proof valve, and when the gas pressure in the battery cell reaches a critical value, a large opening is formed when the gas breaks through the explosion-proof valve, easily achieving rapid pressure reduction of the battery cell.

[0010] In some embodiments, the gas flow groove is provided on the mounting wall facing the inner cavity of the housing, and the pressure reducing groove is provided on the mounting wall facing away from the inner cavity of the housing. In the above technical solution, the side of the mounting wall facing away from the inner cavity of the housing is the outside of the housing, which makes it easy to confirm the position of the pressure reducing groove in the housing, and also makes it easy to confirm the position of the explosion-proof valve, thereby making it easier to determine the relative position of the battery cells by utilizing the position of the explosion-proof valve when installing the battery cells.

[0011] In some embodiments, the gas flow groove and the pressure relief groove are spaced apart. In the above technical solution, this makes it possible to maintain a constant thickness in the portion of the mounting wall located between the gas flow groove and the pressure relief groove, thereby ensuring the structural strength of the mounting wall, helping to reduce the possibility of deformation of the mounting wall, and the gas flow groove located in the mounting wall can smoothly guide the gas into the pressure relief groove.

[0012] In some embodiments, the gas guide groove and the pressure-reducing groove are in communication. In the above technical solution, the gas flows directly into the pressure-reducing groove along the gas guide groove, thereby easily improving the gas guide efficiency and achieving rapid pressure reduction of the battery cell.

[0013] In some embodiments, the pressure-reducing groove includes a first pressure-reducing groove and a second pressure-reducing groove that are arranged to intersect. In the above technical solution, this facilitates communication between the first pressure-reducing groove and the second pressure-reducing groove, and at the same time facilitates increasing the area of ​​the explosion-proof valve, thereby enabling uniform distribution of gas within the first and second pressure-reducing grooves. When the gas pressure in the battery cell reaches a critical value, a large opening is formed when the gas breaks through the explosion-proof valve, easily achieving rapid pressure reduction of the battery cell.

[0014] In some embodiments, the first pressure-reducing groove extends along the length of the mounting wall, and the second pressure-reducing groove extends along the width of the mounting wall. In the above technical solution, the angle formed between the first pressure-reducing groove and the second pressure-reducing groove is 90°, which makes it easier to reduce the resistance force that the gas experiences when flowing between the first and second pressure-reducing grooves, and allows the gas to be distributed quickly and uniformly within the first and second pressure-reducing grooves.

[0015] In some embodiments, the gas guide groove and the explosion-proof valve are arranged in the longitudinal direction of the mounting wall, and the gas guide groove includes a first gas guide groove portion extending along the longitudinal direction of the mounting wall. In the above technical solution, gas flows along the first gas guide groove portion from one end of the mounting wall in the longitudinal direction to the explosion-proof valve, and the gas at the end of the battery cell furthest from the explosion-proof valve is guided to the explosion-proof valve, allowing the gas to be collected in the explosion-proof valve.

[0016] In some embodiments, there are multiple first gas guide grooves, and the multiple first gas guide grooves are spaced apart in the width direction of the mounting wall. In the above technical solution, this easily increases the gas guide range of the gas guide groove, further easily improves the gas guide efficiency of the gas guide groove, and the gas guide groove can quickly guide the gas into the depressurization groove, which helps to improve the depressurization rate.

[0017] In some embodiments, the distance between any two adjacent first gas guide grooves is the same in each gas guide groove. In the above technical solution, the multiple first gas guide grooves can uniformly guide the gas generated from the electrode assembly, and further, the gas can be uniformly guided to the explosion-proof valve.

[0018] In some embodiments, in each gas flow groove, the distance between at least two adjacent first gas flow grooves is different from the distance between two other adjacent first gas flow grooves. In the above technical solution, in some cases, a large amount of gas may be generated in a certain area within the battery cell, and by densely arranging a plurality of first gas flow grooves in the corresponding area of ​​the mounting wall along the width direction of the mounting wall, the gas flow efficiency in that area can be improved, and the gas can be smoothly guided to the explosion-proof valve.

[0019] In some embodiments, the gas guide groove further includes a second gas guide groove, the second gas guide groove extends along the width direction of the mounting wall, one end of the first gas guide groove away from the explosion-proof valve communicates with the second gas guide groove, and the other end extends toward the explosion-proof valve. In the above technical solution, the provision of the second gas guide groove increases the volume of the gas guide groove, allowing the gas guide groove to accommodate more gas, easily improving the guide efficiency, and the gas in the second gas guide groove can enter the first gas guide groove and flow along the first gas guide groove to the explosion-proof valve.

[0020] In some embodiments, the gas guide section comprises two gas guide sections spaced apart along the length of the mounting wall, and the explosion-proof valve is located between the two gas guide sections. In the above technical solution, the gas located at both ends of the explosion-proof valve flows to the explosion-proof valve along the corresponding gas guide grooves, easily improving the gas guide efficiency and increasing the depressurization rate of the battery cell.

[0021] In some embodiments, the explosion-proof valve is located at the center of the mounting wall in the longitudinal direction, and the two gas guide sections have the same structure and are arranged symmetrically with respect to the center of the explosion-proof valve. In the above technical solution, the two gas guide sections can uniformly guide the gas from both sides of the explosion-proof valve into the valve, which helps to reduce the possibility of the gas flow becoming clogged in the gas guide passage, easily improves the gas guide efficiency, and improves the depressurization efficiency of the battery cell.

[0022] In some embodiments, the mounting wall has a first end and a second end that are opposite to each other in its longitudinal direction, the distance between the explosion-proof valve and the first end is greater than the distance between the explosion-proof valve and the second end, and the area of ​​the gas guide portion located between the explosion-proof valve and the first end is greater than the area of ​​the gas guide portion located between the explosion-proof valve and the second end. In the above technical solution, the area of ​​the gas guide portion in a part of the mounting wall is adaptively increased in this way, easily improving the guide efficiency in this part of the wall and adapting to situations where there is a large amount of gas in a particular area of ​​the battery cell.

[0023] In some embodiments, the housing includes a housing cover and a housing body having an opening, the housing cover is placed over the opening, and the mounting wall is located on the housing cover or the housing body. In the above technical solution, when the gas in the battery cell reaches a critical value, the gas can puncture the explosion-proof valve in the mounting wall, thereby reducing the pressure in the battery cell.

[0024] In some embodiments, the housing includes a housing cover and a housing body having an opening, the housing cover is placed over the opening, the mounting wall is located on the housing cover, electrode terminals are provided on a wall of the housing body facing the mounting wall, a housing portion is provided on the electrode terminals, the electrode assembly includes an active material coated portion and a conductive portion connected to the active material coated portion, at least a portion of the conductive portion enters the housing portion and is connected to the electrode terminals. In the above technical solution, by housing at least a portion of the conductive portion within the housing portion, the space occupied by the battery cell itself can be reduced, more battery cells can be housed in a battery of the same volume, the volumetric energy density of the battery can be improved, and at least a portion of the conductive portion is housed within the housing portion, occupying space within the electrode terminals, reducing redundancy of the conductive portion within the housing to at least some extent, reducing the probability of a short circuit between the conductive portion and the active material coated portion, and lowering the probability of a short circuit in the battery cell, thereby improving the operational reliability and stability of the battery cell and the battery.

[0025] In some embodiments, the housing portion includes a first housing groove, the surface of the electrode terminal facing the active material coating portion is the inner end face of the electrode terminal, the groove opening of the first housing groove is formed on the inner end face of the electrode terminal, and at least a portion of the conductive portion is housed in the first housing groove. In the above technical solution, on the one hand, the weight of the electrode terminal can be reduced to some extent by providing a first housing groove in the electrode terminal, thereby improving the gravimetric energy density of the battery cell and battery, and on the other hand, since the groove opening of the first housing groove is formed on the inner end face of the electrode terminal, and the inner end face of the electrode terminal is the surface on the side of the electrode terminal closer to the active material coating portion, the first housing groove is open toward the direction of the active material coating portion, the conductive portion can easily enter the first housing groove, and assembly efficiency is improved. Furthermore, the first housing groove in this form is easy to process and improves production efficiency.

[0026] In some embodiments, the accommodating portion includes a second accommodating groove. The surface of the pole terminal on the side away from the active material coating portion is the outer end face of the pole terminal. The groove opening of the second accommodating groove is formed on the outer end face of the pole terminal. The second accommodating groove communicates with the inside of the housing through a through hole. The conductive portion is formed through the through hole and at least a part of it is accommodated in the second accommodating groove. In the above technical solution, on the one hand, the second accommodating groove is provided on the pole terminal, which can reduce the weight of the pole terminal to a certain extent, improve the weight energy density of the battery cell and the battery. On the other hand, since the groove opening of the second accommodating groove is formed on the outer end face of the pole terminal, and the outer end face of the pole terminal is the surface on the side away from the active material coating portion of the pole terminal, the second accommodating groove is opened in the direction away from the active material coating portion. Thus, when at least a part of the conductive portion is accommodated in the second accommodating groove, the accommodation and arrangement of the conductive portion can be easily realized through the groove opening of the second accommodating groove, and the operation of the electrical connection between the conductive portion and the pole terminal can be easily realized through the groove opening of the second accommodating groove. This can reduce the difficulty of manufacturing the battery cell and improve the production efficiency of the battery cell.

[0027] In a second aspect, the present application provides a battery including the battery cell of the above embodiment. By providing a gas flow guiding groove on the mounting wall, the gas flow guiding groove can guide the air in the housing to flow to the explosion-proof valve, improve the exhaust efficiency of the battery cell, realize the rapid decompression of the battery cell, and compared with separately providing a gas flow guiding assembly inside the battery cell, forming a gas flow guiding portion by opening a gas flow guiding groove on the mounting wall helps to reduce the occupied space of the gas flow guiding portion in the battery cell.

[0028] In a third aspect, the present application provides an electric power consumption device including the battery of the above embodiment. By providing a gas flow guiding groove on the mounting wall, the gas flow guiding groove can guide the air in the housing to flow to the explosion-proof valve, improve the exhaust efficiency of the battery cell, realize the rapid decompression of the battery cell, and compared with separately providing a gas flow guiding assembly inside the battery cell, forming a gas flow guiding portion by opening a gas flow guiding groove on the mounting wall helps to reduce the occupied space of the gas flow guiding portion in the battery cell.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical solution of the present application, it can be implemented according to the content of the specification, and in order to more clearly understand the above and other objects, features and advantages of the present application, specific embodiments of the present application are given below.

[0030] For those skilled in the art, various other advantages and benefits will become clear by reading the following detailed description of the preferred embodiments. The drawings are intended to illustrate the preferred embodiments and should not be regarded as limiting the present application. In the drawings, the same members are denoted by the same reference numerals. The drawings are as follows.

Brief Description of the Drawings

[0031] [Figure 1] It is a schematic diagram of the structure of a vehicle according to some embodiments of the present application. [Figure 2] It is an exploded view of a battery according to some embodiments of the present application. [Figure 3] It is a schematic diagram of the structure of a battery cell according to some embodiments of the present application. [Figure 4] It is a cross-sectional view of the structure of a battery cell according to some embodiments of the present application. [Figure 5] It is an exploded view of the structure of a battery cell according to some embodiments of the present application. [Figure 6] It is a schematic diagram of the structure of a battery cell according to some embodiments of the present application. [Figure 7] It is a schematic diagram of the structure of a mounting wall according to some embodiments of the present application. [Figure 8] It is a schematic diagram of the structure of a mounting wall according to some embodiments of the present application. [Figure 9] It is a cross-sectional view taken along A-A in FIG. 8. [Figure 10] It is an enlarged view of a partial area in FIG. 9. [Figure 11] It is a schematic diagram of the structure of a mounting wall according to some embodiments of the present application. [Figure 12] It is a schematic diagram of the structure of a mounting wall according to some embodiments of the present application. [Figure 13] This is a schematic diagram of the structure of a mounting wall according to several embodiments of the present invention. [Figure 14] This is a schematic diagram of the structure of a mounting wall according to several embodiments of the present invention. [Figure 15] This is a schematic diagram of the structure of a battery cell according to several embodiments of the present invention. [Figure 16] Figure 15 is a cross-sectional view of BB. [Figure 17] This is a schematic diagram of a local cross-section of a battery cell according to several embodiments of the present invention. [Figure 18] This is a schematic diagram of a local cross-section of a battery cell according to several embodiments of the present invention. [Figure 19] This is a schematic diagram of a local cross-section of a battery cell according to several embodiments of the present invention. [Figure 20] This is a schematic diagram of a local cross-section of a battery cell according to several embodiments of the present invention. [Figure 21] This is a schematic diagram of a local cross-section of a battery cell according to several embodiments of the present invention. [Figure 22] This is a schematic diagram of a local cross-section of a battery cell according to several embodiments of the present invention. [Modes for carrying out the invention]

[0032] The following examples of embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are used solely to clarify the technical solution of the present application and are merely examples; they do not limit the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application pertains, and the terms used herein are intended solely to describe specific embodiments and are not intended to limit this application. The terms “including” and “having” and their synonyms in the description and claims of this application and in the description of the drawings above are intended to be non-exclusive.

[0034] In the description of the embodiments of this application, terms such as "first," "second," etc., are merely used to distinguish different objects and should not be understood as implicitly indicating the quantity, specific order, or hierarchical relationship of technical features of relative importance, or that which have been shown. In the description of the embodiments of this application, unless otherwise specifically limited, "multiple" means two or more.

[0035] References to “Examples” in this specification mean that certain features, structures, or properties described in relation to the Examples may be included in at least one Example of the Application. Where the term “Examples” appears elsewhere in this specification, it does not necessarily refer to the same Example, nor does it refer to an Example that is mutually exclusive, independent, or substitutable with other Examples. Those skilled in the art will understand, both explicitly and implicitly, that the Examples described herein can be combined with other Examples.

[0036] The term "and / or" in the description of the embodiments of this application merely describes the relationship between related objects, indicating that three types of relationships are possible. For example, A and / or B can represent three situations: A existing alone, A and B existing simultaneously, and B existing alone. In this specification, the symbol " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0037] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more sets (including two sets), and "multiple sheets" refers to two or more sheets (including two sheets).

[0038] In the description of the embodiments of this application, terms such as "center," "vertical direction," "horizontal direction," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "upper part," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" indicate directions or positional relationships, and are based on the directions or positional relationships shown in the drawings. These terms are merely used to facilitate the explanation of the embodiments of this application and to simplify the explanation. They do not indicate or imply that the device or element in question has a specific direction, or that it should be composed of and operated in a specific direction, and therefore should not be understood as limiting the embodiments of this application.

[0039] In the description of the embodiments of this application, unless otherwise specifically defined and limited, terms such as “attached,” “connected,” “connected,” and “fixed” should be understood in a broad sense. For example, they may be fixed connections, detachable connections, or integral connections. They may be mechanical connections or electrical connections. They may be directly connected, indirectly connected via an intermediate medium, or be internal communication between two elements or an interaction relationship between two components. Those skilled in the art will be able to understand the specific meaning of the above terms in the embodiments of this application depending on the specific circumstances.

[0040] Currently, with the evolving market conditions, the applications of power batteries are expanding rapidly. Power batteries are not limited to applications in energy storage and power systems such as hydroelectric, thermal, wind, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in multiple fields such as military equipment and aerospace. As the application fields of power batteries continue to expand, the demand for them in the market is also constantly growing.

[0041] Battery cells are generally equipped with explosion-proof valves, which are used to release the internal pressure of the battery cell when the internal pressure or temperature reaches a threshold. In related technologies, it takes a long time for the gas inside the battery cell to flow to the explosion-proof valve, and it is released from the valve to reduce the pressure in the battery cell. In other words, the rate at which the battery cell reduces pressure is slow, and the reduction time is long.

[0042] To improve the depressurization rate of the battery cell, the present invention provides a gas guide groove near the explosion-proof valve, which is used to guide the gas inside the battery cell, allowing the gas inside the battery cell to flow along the gas guide groove to the explosion-proof valve. As a result, the gas is discharged sequentially from the explosion-proof valve, contributing to the exhaust speed of the battery cell and improving the depressurization rate of the battery cell.

[0043] The batteries disclosed in the embodiments of this application are used as power sources for power-consuming devices or in various energy storage systems that use batteries as energy storage elements. Power-consuming devices may include, but are not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, and spacecraft. Electric toys may include stationary or mobile electric toys such as game consoles, electric car toys, electric boat toys, and electric aircraft toys, and spacecraft may include aircraft, rockets, space shuttles, and spacecraft.

[0044] In the following embodiments, for the sake of explanation, the power consumption device of the embodiment of the present application will be described as a vehicle 1000.

[0045] Referring to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 according to several embodiments of the present application, the vehicle 1000 may be a gasoline vehicle, a natural 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, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000, for example, as the operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the operating power requirements for starting, navigation, and driving the vehicle 1000.

[0046] In some embodiments of the present invention, the battery 100 can provide driving power to the vehicle 1000 not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, by substituting or partially substituting fuel or natural gas.

[0047] Referring to Figure 2, which is an exploded view of a battery 100 according to several embodiments of the present invention, the battery 100 includes a housing 20 and a battery cell 10, the battery cell 10 being housed within the housing 20. The housing 20 is used to provide a housing space for the battery cell 10, and the housing 20 can employ various structures. In some embodiments, the housing 20 may include a first part 201 and a second part 202, the first part 201 and the second part 202 overlapping each other, and the first part 201 and the second part 202 jointly define a housing space for housing the battery cell 10. The second part 202 may be a hollow structure with one end open, and the first part 201 may be a plate-like structure, the first part 201 overlapping the open side of the second part 202, so that the first part 201 and the second part 202 together define a housing space. Alternatively, both the first part 201 and the second part 202 may be hollow structures with one side open, and the open side of the first part 201 may be fitted over the open side of the second part 202. Naturally, the housing 20 formed by the first part 201 and the second part 202 may have various shapes such as a cylinder or a rectangular parallelepiped.

[0048] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in series-parallel. Series-parallel connection means that the multiple battery cells 10 can be connected in both series and parallel. Multiple battery cells 10 can be directly connected in series, in parallel, or in series-parallel, and then the entire assembly composed of multiple battery cells 10 can be housed in the housing 20. In addition, the battery 100 may first be formed in the form of a battery module by connecting multiple battery cells 10 in series, in parallel, or in series-parallel, and then the multiple battery modules may be further connected in series, in parallel, or in series-parallel to form a single unit which can then be housed in the housing 20. The battery 100 may further include other structures, such as bus members for realizing electrical connections between multiple battery cells 10.

[0049] Each battery cell 10 may be a secondary battery or a primary battery, and may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 may be cylindrical, flattened, rectangular, or have other shapes.

[0050] Referring to Figures 3 and 4, Figure 3 is a schematic diagram of the structure of a battery cell 10 according to some embodiments of the present application, and Figure 4 is a cross-sectional view of the structure of a battery cell 10 according to some embodiments of the present application. The battery cell 10 includes a housing 11 and an electrode assembly 2. The housing 11 may include a housing body 111 and a housing cover 112.

[0051] The housing cover 112 is a component that is placed over the opening of the housing body 111 to isolate the internal environment of the battery cell 10 from the external environment. The shape of the housing cover 112 can be adapted to the shape of the housing body 111 and fitted together with the housing body 111, but is not limited to this. The housing cover 112 can be selectively manufactured from a material with a certain hardness and strength (for example, an aluminum alloy), which makes it less likely to deform even if the housing cover 112 is pressed or struck, allowing the battery cell 10 to have higher structural strength and improving reliability.

[0052] The housing cover 112 can be made of any material, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, and the embodiments of this application are not particularly limited thereto. In some embodiments, an insulating member may be installed inside the housing cover 112, which may be used to isolate electrical connection members in the housing body 111 from the housing cover 112, thereby reducing the risk of short circuits. Exemplarily, the insulating member may be made of plastic, rubber, or the like.

[0053] The housing body 111 is an assembly that fits with the housing cover 112 to form the internal environment of the battery cell 10, and the formed internal environment may be used to house the electrode assembly 2, electrolyte, and other components. Functional components such as electrode terminals 12 may be provided on the housing body 111. The electrode terminals 12 can be used to electrically connect to the electrode assembly 2 and are used to output or input electrical energy of the battery cell 10. The housing 11 is provided with an explosion-proof valve 6, which is used to release the internal pressure of the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a threshold.

[0054] The housing body 111 and the housing cover 112 may be separate components, and the housing body 111 may have an opening 1110, where the housing cover 112 is placed over the opening to form the internal environment of the battery cell 10. The housing cover 112 and the housing body 111 may be integrated, and specifically, the housing cover 112 and the housing body 111 may have a common connecting surface before other components are placed in the housing, and the housing cover 112 is placed over the housing body 111 when it is necessary to seal the inside of the housing body 111, but is not limited to this.

[0055] The housing body 111 may have various shapes and dimensions, such as a rectangular parallelepiped, cylinder, or hexagonal prism. Specifically, the shape of the housing body 111 is determined by the specific shape and size of the electrode assembly 2. The housing body 111 may be made of any material, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, and the embodiments of this application are not particularly limited to these materials.

[0056] The electrode assembly 2 is a component that generates an electrochemical reaction in the battery cell 10. One or more electrode assemblies 2 can be contained within the housing body 111. The electrode assembly 2 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and generally a separator is provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet that have active material constitute the main body of the electrode assembly, and the portions of the positive electrode sheet and the negative electrode sheet that do not have active material each constitute a tab, and the positive electrode tab and the negative electrode tab are both located at one end of the main body or at both ends of the main body, respectively. During the charging and discharging process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminals to form an electric current circuit.

[0057] As shown in Figures 3 and 4, the battery cell 10 further includes a bracket 3, an insulating member 4, and an explosion-proof valve 6. The bracket 3 is provided at one end of the active material coated portion 21, and a through hole 314 is provided in the bracket 3, allowing the tab 22 to pass through the through hole 314 and be connected to the electrode terminal 12. The insulating member 4 is connected to the bracket 3 and covers the circumferential direction of the electrode assembly 2 together. The insulating member 4 may also be used to isolate the electrical connection members within the housing 11 from the housing 11, thereby reducing the risk of short circuits. Exemplarily, the insulating member 4 may be plastic, rubber, or the like. The insulating member 4 may be bonded to the bracket 3, or hot-melt bonded, and of course, the insulating member 4 and the bracket 3 may be connected in other ways. The explosion-proof valve 6 is provided in the housing 11 and is used to release the internal pressure of the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a threshold. The explosion-proof valve 6 may be provided in the housing cover 112 or in the housing body 111.

[0058] Referring to Figures 5 and 6, Figure 5 is an exploded view of the structure of a battery cell 10 according to some embodiments of the present application, and Figure 6 is a schematic view of the structure of a battery cell 10 according to some embodiments of the present application. The present application provides a battery cell 10. The battery cell 10 includes a housing 11, the housing 11 includes a mounting wall 114, the mounting wall 114 refers to one wall body of the housing 11.

[0059] The battery cell 10 further includes an electrode assembly 2, an explosion-proof valve 6, and a gas guide section 80, the electrode assembly 2 being located within the housing 11, the explosion-proof valve 6 being located on the mounting wall 114, and the gas guide section 80 including a gas guide groove 81, the gas guide groove 81 being located in the mounting wall 114, and the gas guide groove 81 being used to guide the gas generated from the electrode assembly 2 to the explosion-proof valve 6.

[0060] The electrode assembly 2 is a component that generates an electrochemical reaction in the battery cell 10. During the charging and discharging process of the battery, the active material coated portion 21 of the electrode assembly 2 reacts with the electrolyte to generate gas. When thermal runaway occurs in the battery cell 10, the gas expands due to the heat, increasing the gas pressure inside the battery cell 10.

[0061] The explosion-proof valve 6 is provided on the mounting wall 114. When the pressure inside the battery cell 10 exceeds a critical value, the pressure inside the battery cell 10 will break through the explosion-proof valve 6. At this time, the inside of the housing 11 will be in communication with the external environment, reducing the pressure inside the battery cell 10. By providing the explosion-proof valve 6, the safety of using the battery cell 10 can be improved, and the possibility of the battery cell 10 exploding can be reduced.

[0062] The gas guide groove 81 is formed in the mounting wall 114 by performing a process such as laser cutting or numerical control pressing on the mounting wall 114, thereby creating a space in the mounting wall 114 that can accommodate gas. At the same time, when the internal pressure of the battery cell 10 is high, under the action of the gas pressure, the gas guide groove 81 guides the gas generated from the electrode assembly 2 to the explosion-proof valve 6, allowing the gas to be collected in the explosion-proof valve 6. Furthermore, when the gas pressure inside the battery cell 10 reaches a critical value, the gas pressure inside the battery cell 10 flows rapidly to the explosion-proof valve 6, piercing the explosion-proof valve 6 and enabling rapid depressurization of the battery cell 10.

[0063] Both the gas guide groove 81 and the explosion-proof valve 6 are provided on the mounting wall 114. By positioning the gas guide groove 81 near the explosion-proof valve 6, the gas guide groove 81 can easily and quickly guide the gas towards the explosion-proof valve 6. Furthermore, when the gas inside the battery cell 10 reaches a critical value, the gas is quickly collected near the explosion-proof valve 6, piercing through the valve 6 and enabling rapid depressurization of the battery cell 10.

[0064] Furthermore, compared to providing a gas guide assembly independently inside the battery cell 10, creating a gas guide groove 81 in the mounting wall 114 to form a gas guide section 80 helps reduce the space occupied by the gas guide section 80 within the battery cell 10, leaving more space for the electrode assembly 2 and easily improving the capacity of the battery cell 10.

[0065] Referring again to Figure 6, and further to Figure 7, which is a schematic diagram of the structure of a mounting wall 114 according to some embodiments of the present invention, the explosion-proof valve 6 includes a pressure-reducing groove 60 opened in the mounting wall 114.

[0066] By performing a process such as laser cutting or numerical control pressing on the mounting wall 114, a pressure-reducing groove 60 can be formed on the mounting wall 114. The thickness of the wall surface of the mounting wall 114 facing the pressure-reducing groove 60 is thin, and the structural strength of this area is low. When the gas inside the battery cell 10 reaches a critical value, the gas can preferentially penetrate the thinner wall surface of the mounting wall 114.

[0067] When the gas inside the battery cell 10 reaches a critical value, the gas penetrates the wall surface of the mounting wall 114 that has low structural strength, that is, penetrates the wall surface of the mounting wall 114 that is opposite the pressure-reducing groove 60, and further destroys the explosion-proof valve 6, thereby connecting the inside of the battery cell 10 with the external environment and achieving a pressure reduction in the battery cell 10.

[0068] Referring to Figures 8, 9, and 10, Figure 8 is a schematic diagram of the structure of a mounting wall 114 according to some embodiments of the present invention, Figure 9 is a cross-sectional view of AA in Figure 8, and Figure 10 is an enlarged view of a part of Figure 9, in which the depth H1 of the gas flow groove 81 is smaller than the depth H2 of the pressure reducing groove 60.

[0069] The mounting wall 114 has a thickness of H, and the thickness of the mounting wall 114 extends along the Z direction. The depths of the gas flow groove 81 and the pressure reducing groove 60 also extend along the Z direction. The mounting wall 114 includes a first wall portion 1143 and a second wall portion 1144. After the gas flow groove 81 is provided in the mounting wall 114, the wall portion of the mounting wall 114 facing the gas flow groove 81 in the Z direction is the first wall portion 1143. After the pressure reducing groove 60 is provided in the mounting wall 114, the wall portion of the mounting wall 114 facing the pressure reducing groove 60 in the Z direction is the second wall portion 1144, and the second wall portion 1144 is formed as an explosion-proof valve 6.

[0070] The thickness of the first wall 1143 is H-H1, and the thickness of the second wall 1144 is H-H2. By making the depth H1 of the gas flow groove 81 smaller than the depth H2 of the pressure-reducing groove 60, the thickness of the first wall 1143 is controlled to be greater than the thickness of the second wall 1144. Furthermore, the structural strength of the first wall 1143 is made greater than that of the second wall 1144. As a result, when the gas inside the battery cell 10 reaches a critical value, the gas will preferentially penetrate the second wall 1144, that is, it will preferentially destroy the explosion-proof valve 6.

[0071] Specifically, after the critical value of the battery cell 10 is determined, it is only necessary to control the thickness, material, etc., of the second wall portion 1144. When the gas pressure inside the battery cell 10 reaches the critical value, it can break through the second wall portion 1144. This reduces the possibility of the gas inside the battery cell 10 breaking through the first wall portion 1143 by making the depth H1 of the gas flow groove 81 smaller than the depth H2 of the pressure reduction groove 60, that is, by making the thickness of the first wall portion 1143 larger than the thickness of the second wall portion 1144.

[0072] Referring again to Figure 8, and further to Figure 11, Figure 11 is a schematic diagram of the structure of a mounting wall 114 according to some embodiments of the present invention, where both the gas flow groove 81 and the pressure reducing groove 60 are provided on the side of the mounting wall 114 facing the inner cavity of the housing 11.

[0073] The gas guide groove 81 is used to guide the gas generated from the electrode assembly 2 into the depressurization groove 60. The gas guide groove 81 and the depressurization groove 60 are located on the same side, so that the gas guide groove 81 can uniformly guide the gas into the depressurization groove 60, allowing the gas to be uniformly distributed within the depressurization groove 60. Furthermore, the gas collects uniformly at the explosion-proof valve 6, and when the gas in the battery cell 10 reaches a critical value, a large opening 1110 is formed when the gas breaks through the explosion-proof valve 6, easily achieving rapid depressurization of the battery cell 10.

[0074] Continuing to refer to Figures 9 and 10, the thickness direction of the mounting wall 114 extends along the vertical direction, and in the vertical direction, the opening 1110 of the gas flow groove 81 and the opening 1110 of the pressure-reducing groove 60 are oriented upwards toward the mounting wall 114, a first wall portion 1143 is defined between the bottom wall to which the groove is attached and the lower bottom wall of the mounting wall 114, and a second wall portion 1144 is defined between the bottom wall of the pressure-reducing groove 60 and the lower bottom wall of the mounting wall 114.

[0075] Referring further to Figures 5 to 7, and then to Figure 12, which is a schematic diagram of the structure of a mounting wall 114 according to some embodiments of the present application, the gas flow groove 81 is provided on the side of the mounting wall 114 facing the inner cavity of the housing 11, and the pressure reducing groove 60 is provided on the side of the mounting wall 114 facing away from the inner cavity of the housing 11.

[0076] The side of the mounting wall 114 that faces away from the inner cavity of the housing 11 is the outside of the housing 11, making it easier to confirm the position of the pressure reducing groove 60 in the housing 11, and also making it easier to confirm the position of the explosion-proof valve 6. This makes it easier to determine the relative position of the battery cell 10 by utilizing the position of the explosion-proof valve 6 when installing the battery cell 10.

[0077] The thickness of the mounting wall 114 extends along the vertical direction, and in the vertical direction, the opening 1110 of the gas flow groove 81 is directed upward towards the mounting wall 114, and the opening 1110 of the pressure-reducing groove 60 is directed downward towards the mounting wall 114. A first wall portion 1143 is defined between the bottom wall to which the groove is attached and the lower bottom wall of the mounting wall 114, and a second wall portion 1144 is defined between the bottom wall of the pressure-reducing groove 60 and the upper wall of the mounting wall 114.

[0078] Continuing with Figure 8, in some embodiments of the present application, the gas flow groove 81 and the pressure reduction groove 60 are arranged with a gap between them.

[0079] The thickness of the portion of the mounting wall 114 located between the gas guide groove 81 and the pressure reducing groove 60 is not thinned, which ensures the structural strength of the wall surface between the gas guide groove 81 and the pressure reducing groove 60 in the mounting wall 114, helps reduce the possibility of deformation of the mounting wall 114, and allows the gas guide groove 81 located in the mounting wall 114 to smoothly guide the gas into the pressure reducing groove 60.

[0080] In another embodiment of the present invention, the gas flow channel groove 81 and the pressure reduction groove 60 are in communication with each other.

[0081] The gas flows along the gas guide groove 81 to the pressure reduction groove 60, and flows into the pressure reduction groove 60, thereby easily improving the gas guide efficiency and enabling rapid pressure reduction of the battery cell 10.

[0082] Continuing with Figures 7 and 8, the pressure-reducing groove 60 includes a first pressure-reducing groove 61 and a second pressure-reducing groove 62 that are arranged to intersect.

[0083] Intersecting arrangement means that the first pressure reducing groove 61 and the second pressure reducing groove 62 have an intersection point, the first pressure reducing groove 61 and the second pressure reducing groove 62 may extend along a straight line, the angle between the first pressure reducing groove 61 and the second pressure reducing groove 62 may be a right angle or an acute angle, and the first pressure reducing groove 61 and the second pressure reducing groove 62 may extend along a curve.

[0084] The arrangement of the first pressure reducing groove 61 and the second pressure reducing groove 62 intersects, making it easier to achieve communication between the first pressure reducing groove 61 and the second pressure reducing groove 62, and at the same time making it easier to increase the area of ​​the explosion-proof valve 6. This allows the gas to be uniformly distributed within the first pressure reducing groove 61 and the second pressure reducing groove 62, and when the gas pressure inside the battery cell 10 reaches a critical value, a large opening 1110 is easily formed when the gas breaks through the explosion-proof valve 6, thus easily achieving rapid depressurization of the battery cell 10.

[0085] Continuing with Figures 7 and 8, the first pressure reducing groove 61 extends along the length of the mounting wall 114, and the second pressure reducing groove 62 extends along the width of the mounting wall 114.

[0086] The angle formed between the first pressure-reducing groove 61 and the second pressure-reducing groove 62 is 90°, which reduces the resistance the gas experiences when flowing between the first pressure-reducing groove 61 and the second pressure-reducing groove 62, allowing the gas to be distributed quickly and uniformly within the first and second pressure-reducing grooves 61 and 62.

[0087] Continuing to refer to Figure 8, the depressurization groove 60 includes one first depressurization groove 61 and three second depressurization grooves 62. The first depressurization groove 61 extends in the left-right direction, and the second depressurization grooves 62 extend in the front-back direction. The three second depressurization grooves 62 are spaced apart in the left-right direction, and the first depressurization groove 61 communicates with the center of the three second depressurization grooves 62. As a result, the gas in the first depressurization groove 61 flows into the second depressurization grooves 62, and the gas in the second depressurization grooves 62 The gas also flows into the first pressure reducing groove 61, and the gas pressure between the first pressure reducing groove 61 and the second pressure reducing groove 62 becomes equilibrium, reducing the probability that the gas pressure in a specific area of ​​the pressure reducing groove 60 will become high. The gas is uniformly distributed within the first pressure reducing groove 61 and the second pressure reducing groove 62, and when the gas in the battery cell 10 reaches a critical value, the gas can uniformly penetrate the explosion-proof valve 6 and easily form a large opening 1110, thereby easily achieving rapid depressurization of the battery cell 10.

[0088] Continuing with reference to Figures 8 and 11, the gas flow groove 81 and the explosion-proof valve 6 are arranged in the longitudinal direction of the mounting wall 114, and the gas flow groove 81 includes a first gas flow groove portion 811 that extends along the longitudinal direction of the mounting wall 114.

[0089] The X direction is the longitudinal direction of the mounting wall 114, and the Y direction is the width direction of the mounting wall 114. The gas flow groove 81 and the explosion-proof valve 6 are positioned in the X direction. The gas flow groove 81 can guide the gas generated from the electrode assembly 2 along the X direction to the explosion-proof valve 6. The gas flows from one end of the mounting wall 114 along the first gas flow groove 811 to the explosion-proof valve 6, guiding the gas at the end of the battery cell 10 furthest from the explosion-proof valve 6 to the explosion-proof valve 6, thereby collecting the gas in the explosion-proof valve 6.

[0090] Continuing with Figures 8 and 11, there are multiple first gas guide grooves 811, and the multiple first gas guide grooves 811 are spaced apart in the width direction of the mounting wall 114.

[0091] The mounting wall 114 extends along the Y direction in the width direction and along the X direction in the length direction, the first gas flow groove extends along the X direction, and the multiple first gas flow grooves are spaced apart along the Y direction, which easily increases the gas flow range of the gas flow groove 81 and further easily improves the gas flow efficiency of the gas flow groove 81, so that the gas flow groove 81 can quickly guide the gas to the depressurization groove 60, which helps to improve the depressurization rate of the battery cell.

[0092] Referring again to Figure 8, and further to Figure 13, which is a schematic diagram of the structure of a mounting wall 114 according to some embodiments of the present invention, in each gas flow groove 81, the distance between any two adjacent first gas flow groove sections 811 is the same.

[0093] Multiple first gas guide grooves 811 extend along the Y direction, and the distance between two adjacent first gas guide grooves 811 along the Y direction is the same, allowing the multiple first gas guide grooves 811 to uniformly guide the gas generated from the electrode assembly 2, and further, to uniformly guide the gas to the explosion-proof valve 6.

[0094] Referring to Figure 14, which is a schematic diagram of the structure of a mounting wall 114 according to some embodiments of the present application, in each gas flow groove 81, the distance between at least two adjacent first gas flow groove sections 811 is different from the distance between another two adjacent first gas flow groove sections 811.

[0095] Multiple first gas guide grooves 811 extend along the Y direction, and the distance in the Y direction between at least two adjacent first gas guide grooves 811 is different from the distance in the Y direction between another two adjacent first gas guide grooves 811.

[0096] The distance between at least two adjacent first gas guide grooves 811 differs from the distance between any other two adjacent first gas guide grooves 811, meaning that in some areas of the mounting wall 114, the multiple first gas guide grooves 811 are densely arranged in the Y direction, while in other areas, the multiple first gas guide grooves 811 are sparsely arranged in the Y direction, intentionally guiding gas to different locations.

[0097] In some cases, a large amount of gas may be generated in certain areas within the battery cell 10. By densely arranging multiple first gas guide grooves along the Y direction in the corresponding areas of the mounting wall 114, the gas guide efficiency of the first gas guide groove 811 to those areas can be improved, and the gas can be smoothly guided to the explosion-proof valve 6.

[0098] Continuing with reference to Figures 8, 13, and 14, the gas flow channel 81 further includes a second gas flow channel 812, the second gas flow channel 812 extends along the width direction of the mounting wall 114, one end of the first gas flow channel 811 away from the explosion-proof valve 6 communicates with the second gas flow channel 812, and the other end extends toward the explosion-proof valve 6.

[0099] The second gas guide groove 812 extends along the Y direction, and the first gas guide groove 811 extends along the X direction, with the end of the first gas guide groove 811 away from the explosion-proof valve 6 communicating with the second gas guide groove 812. The provision of the second gas guide groove 812 increases the volume of the gas guide groove 81, allowing the gas guide groove 81 to accommodate more gas, easily improving the flow efficiency of the gas guide groove 81, so that the gas in the second gas guide groove 81 can enter the first gas guide groove 81 and flow along the first gas guide groove 81 to the explosion-proof valve 6.

[0100] Continuing with reference to Figures 8, 13, and 14, the gas guide section 80 includes two gas guide sections 80, which are spaced apart along the length of the mounting wall 114, and the explosion-proof valve 6 is located between the two gas guide sections 80.

[0101] The two gas flow grooves 81 are spaced apart in the X direction, and in the X direction, the explosion-proof valve 6 is located between the two gas flow sections 80. The gas flow grooves 81 of the two gas flow sections 80 guide the gas at both ends of the explosion-proof valve 6 in the X direction, and the gas located at both ends of the explosion-proof valve 6 in the X direction flows into the explosion-proof valve 6 along the corresponding gas flow grooves 81, further improving the gas flow efficiency and improving the depressurization rate of the battery cell 10.

[0102] Continuing with Figure 8, the explosion-proof valve 6 is located at the center of the mounting wall 114 in the longitudinal direction, and the two gas flow sections 80 have the same structure and are arranged symmetrically with respect to the center of the explosion-proof valve 6.

[0103] The centerline of the explosion-proof valve 6 extends along the Y direction, and the two gas guide sections 80 have the same structure and are arranged symmetrically with respect to the center of the explosion-proof valve 6. As a result, the two gas guide sections 80 can uniformly guide the gas located on both sides of the explosion-proof valve 6 in the X direction, allowing the gas to flow uniformly into the explosion-proof valve 6, reducing the possibility of the gas flow becoming clogged in the gas guide passage, easily improving the gas guide efficiency, and improving the pressure reduction efficiency of the battery cell 10.

[0104] Continuing with reference to Figures 13 and 14, the mounting wall 114 has a first end and a second end that are opposite to each other in its longitudinal direction, the distance between the explosion-proof valve 6 and the first end is greater than the distance between the explosion-proof valve 6 and the second end, and the area of ​​the gas flow section 80 located between the explosion-proof valve 6 and the first end is greater than the area of ​​the gas flow section 80 located between the explosion-proof valve 6 and the second end.

[0105] The first and second ends of the mounting wall 114 are both ends in the longitudinal direction of the mounting wall 114, the longitudinal direction of the mounting wall 114 extends along the left-right direction, and if the distance between the left end of the explosion-proof valve 6 and the left end of the mounting wall 114 is S1, and the distance between the right end of the explosion-proof valve 6 and the right end of the mounting wall 114 is S2, then S1 is not equal to S2.

[0106] In some cases, there may be a large amount of gas generated in certain areas within the battery cell 10. If there is more gas on the left side of the battery cell 10 than on the right side, the distance between the explosion-proof valve 6 and the first end is greater than the distance between the explosion-proof valve 6 and the second end, i.e., S1 > S2. The area of ​​the gas guide section 80 located on the left side of the mounting wall 114 is greater than the area of ​​the gas guide section 80 located on the right side of the mounting wall 114. This increases the area of ​​the gas guide section 80 on the left side of the mounting wall 114, which helps to improve the gas guide efficiency on the left side of the battery cell 10 and allows adaptation to situations where there is more gas on the left side of the battery cell 10.

[0107] Naturally, if there is more gas on the right side of the battery cell 10 than on the left side, S2 > S1, and the area of ​​the gas guide section 80 located on the right side of the mounting wall 114 is larger than the area of ​​the gas guide section 80 located on the left side of the mounting wall 114. This increases the area of ​​the gas guide section 80 on the right side of the mounting wall 114, which helps to improve the gas guide efficiency on the right side of the battery cell 10 and allows adaptation to situations where there is more gas on the right side of the battery cell 10.

[0108] Refer to Figure 5, and subsequently to Figures 15 and 16, where Figure 15 is a schematic diagram of the structure of a battery cell 10 according to some embodiments of the present application, and Figure 16 is a cross-sectional view of BB in Figure 15, where the housing 11 includes a housing cover 112 and a housing body 111 having an opening 1110, the housing cover 112 is placed over the opening 1110, and the mounting wall 114 is located on the housing cover 112 or the housing body 111.

[0109] The housing cover 112 is placed over the opening 1110 to form the internal environment of the battery cell 10. When the gas inside the battery cell 10 reaches a critical value, the gas can penetrate the explosion-proof valve 6 of the mounting wall 114, thereby reducing the pressure inside the battery cell 10.

[0110] The mounting wall 14 may be provided on the housing cover 112, and the mounting wall 114 may be a side wall of the housing body 111 adjacent to the housing cover 112; however, this is not overly limited here.

[0111] Referring to Figure 5, the mounting wall 114 is located on the housing cover 112, the electrode terminals 12 are provided on the wall surface of the housing body 111 facing the opening 1110, the electrode terminals 12 and the mounting wall 114 are located at both ends of the battery cell 10, and the electrode terminals 12 and the explosion-proof valve 6 are spaced apart, thereby reducing the effect of gas on the electrode terminals 12 when gas accumulates at the explosion-proof valve 6.

[0112] Furthermore, the housing cover 112 has a smaller volume than the housing 11, making it easier to machine and form the gas flow groove 81 and the pressure reduction groove 60 in the housing cover 112, thus helping to reduce the difficulty of machining.

[0113] Referring to Figure 5, and subsequently to Figures 17 and 18, Figure 17 is a schematic local cross-sectional view of a battery cell 10 according to some embodiments of the present application. Figure 18 is a schematic local cross-sectional view of a battery cell 10 according to some embodiments of the present application. The housing 11 includes a housing body 111 having a housing cover 112 and an opening 1110, the housing cover 112 is placed over the opening 1110, a mounting wall 114 is located on the housing cover 112, a pole terminal 12 is provided on the wall of the housing body 111 facing the mounting wall 114, a housing portion 121 is opened in the pole terminal 12, at least a part of the conductive portion 22 is housed inside the housing portion 121, and the conductive portion 22 is electrically connected to the pole terminal 12. In other words, the pole terminal 12 is provided in a hollow structure.

[0114] "At least a part" means that the conductive part 22 may be entirely housed within the housing part 121, or a part of the conductive part 22 may be housed within the housing part 121. Because the housing part 121 is provided on the electrode terminal 12, the hollow structure of the housing part 121 can, on the one hand, reduce the weight of the electrode terminal 12 to some extent, improving the weight energy density of the battery cell 10 and the battery 100. On the other hand, the conductive part 22 can be housed within the housing part 121, improving the assembly efficiency of the conductive part 22. Furthermore, the space occupied by the conductive part 22 is saved, allowing for full utilization of the space in the battery cell 10, making the structure of the battery cell 10 more compact and contributing to an improvement in the energy density of the battery cell 10.

[0115] More specifically, if part or all of the conductive portion 22 is housed within the housing portion 121, the portion of the conductive portion 22 located within the housing portion 121 occupies space within the electrode terminal 12, thereby reducing the space occupied by the conductive portion 22 within the housing 11. If the size of the housing 11 is fixed, some space can be saved within the housing 11 to accommodate a larger active material coated portion 21, improving the volumetric energy density of the battery cell 10. For example, if the conductive portion 22 is drawn out from the side of the active material coated portion 21 closer to the electrode terminal 12, the space occupied by the conductive portion 22 between the active material coated portion 21 and the electrode terminal 12 can be saved, increasing the size of the conductive portion 22 in the direction of drawing out the active material coated portion 21, reducing the distance between the active material coated portion 21 and the electrode terminal 12, and improving the energy density of the battery cell 10.

[0116] At the same time, by housing at least a portion of the conductive portion 22 within the housing portion 121, the space occupied by the battery cell 10 itself can be reduced, allowing more battery cells 10 to be housed in the same volume of battery 100, thereby improving the volumetric energy density of the battery 100. Furthermore, by housing at least a portion of the conductive portion 22 within the housing portion 121, the space within the electrode terminals 12 is occupied, reducing the redundancy of the conductive portion 22 within the housing 11 to at least some extent, thereby reducing the probability of a short circuit between the conductive portion 22 and the active material coated portion 21, and lowering the probability of a short circuit in the battery cell 10, thereby improving the operational reliability and stability of the battery cell 10 and the battery 100.

[0117] In the embodiment of the present invention, the position of the housing portion 121 may be located on the side of the electrode terminal 12 facing the active material coated portion 21, or on the side of the electrode terminal 12 away from the active material coated portion 21.

[0118] For illustrative purposes, referring again to Figures 17 and 18, if the housing portion 121 is located on the side of the electrode terminal 12 facing the active material coated portion 21, the housing portion 121 includes a first housing groove 12110, the surface of the electrode terminal 12 facing the active material coated portion 21 is the inner end face 122 of the electrode terminal, the groove opening of the first housing groove 12110 is formed on the inner end face 122 of the electrode terminal, and at least a portion of the conductive portion 22 is housed within the first housing groove 12110.

[0119] For example, the first housing groove 12110 is a groove body, and the groove body has a groove-like structure of a certain depth. For example, if the pole terminal 12 is provided on the upper end wall of the housing 11 and the inner end face 122 of the pole terminal is the lower surface of the pole terminal 12, the first housing groove 12110 is formed as a housing groove with a groove opening that is open downwards and a groove wall that is recessed upwards. For example, if the pole terminal 12 is provided on the lower end wall of the housing 11 and the inner end face 122 of the pole terminal is the upper surface of the pole terminal 12, the first housing groove 12110 is formed as a housing groove with a groove opening that is open upwards and a groove wall that is recessed downwards.

[0120] In the above technical solution, on the one hand, the first housing groove 12110 is formed in the electrode terminal 12, which reduces the weight of the electrode terminal 12 to some extent, thereby improving the gravimetric energy density of the battery cell 10 and the battery 100. On the other hand, since the groove opening of the first housing groove 12110 is formed on the inner end face 122 of the electrode terminal, and the inner end face 122 is the surface of the electrode terminal 12 that is close to the active material coated portion 21, the first housing groove 12110 is open toward the active material coated portion 21, the conductive portion 22 can easily enter the first housing groove 12110, and assembly efficiency is improved. Furthermore, this form of the first housing groove 12110 is easy to process and improves production efficiency.

[0121] Furthermore, the first housing groove 12110 is easy to process to have a large volume, allowing it to accommodate more conductive parts 22. At the same time, since the first housing groove 12110 is open toward the material coating part 21, it can be used as a buffer and temporary storage structure for the electrolyte. This allows more electrolyte to be contained within the housing 11, and since the electrolyte is consumed during the charging and discharging process of the battery cell 10, a larger amount of electrolyte can extend the service life of the battery cell 10. In addition, since the first housing groove 12110 is open toward the active material coating part 21, it can also be used as a containment and buffer structure for generated gases inside the electrode assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0122] Furthermore, since the first housing groove 12110 is located inside the electrode terminal 12, it is difficult for external foreign matter or impurities to enter the first housing groove 12110, thereby reducing the influence of external foreign matter or impurities on the electrode assembly 2, improving the stability and reliability of the operation of the electrode assembly 2, and improving the stability and reliability of the battery cell 10 and the battery 100.

[0123] Referring again to Figure 17, in the embodiments of the present application, the connection method between the pole terminal 12 and the housing 11 is not limited and may be, for example, welded or riveted. For example, when the two are fitted together by riveting, the housing 11 has a through hole 113, and the pole terminal 12 is attached to the through hole 113 by riveting. It should be understood that when the two are fitted together by welding or other means, the housing 11 may have a through hole 113 so that the pole terminal 12 is attached to the housing 11 via the through hole 113, and is not limited thereto.

[0124] At the same time, the first accommodating groove 12110 may be provided corresponding to the position of the through hole 113. In other words, in a projection plane with an axial R perpendicular to the pole terminal 12, the orthographic projection of the first accommodating groove 12110 lies within the range of the orthographic projection of the through hole 113. The first accommodating groove 12110 has a large depth to accommodate more conductive parts 22, and furthermore, the space occupied by the conductive parts 22 within the housing 11 can be reduced more significantly. Specifically, when a through hole 113 is provided in the housing 11 and the pole terminal 12 is attached to the through hole 113, the depth H1 of the first accommodating groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the pole terminal to the through hole 113, along the axial R of the pole terminal 12.

[0125] The specific shape of the first housing groove 12110 is not limited and may be regular or irregular. For example, it may be a columnar groove with a rectangular, elliptical, or track-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional size, a hemispherical groove with a circular cross-section and gradually changing cross-sectional size, or a semi-elliptical groove with an elliptical cross-section and gradually changing cross-sectional size. Therefore, the depth H1 of the first housing groove 12110 is the maximum depth of the first housing groove 12110 along the axial radius R of the pole terminal 12.

[0126] In the axial radius R of the electrode terminal 12, the depth H1 of the first housing groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the electrode terminal to the through hole 113, thus allowing for full utilization of the volume of the electrode terminal 12. The first housing groove 12110 has a large depth, which is advantageous for accommodating more conductive parts 22, further reducing the space occupied by the conductive parts 22 within the housing 11, thereby further improving the energy density of the battery cell 10 and further reducing the redundancy of the conductive parts 22 within the housing 11. At the same time, because the first housing groove 12110 has a large depth, it can accommodate the generated gas of the electrode assembly 2, improving the reliability and stability of the battery cell 10, and further allowing for the accommodation of more electrolyte, thereby improving the service life of the battery cell 10.

[0127] Referring again to Figures 17 and 18, in order to improve the stability and reliability of the electrical connection between the active material coated portion 21 and the electrode terminal 12, in some embodiments of the present application, the location of the electrical connection between the conductive portion 22 and the electrode terminal 12 may be located on the groove wall of the first housing groove 12110 formed in the housing portion 121.

[0128] Exemplary, an electrical connection is formed between the conductive part 22 and the electrode terminal 12 by welding, and the location of the electrical connection is the welding location between the conductive part 22 and the electrode terminal 12. At the same time, the welding method between the conductive part 22 and the electrode terminal 12 is not limited and may be laser welding, for example, and vertical welding, inclined welding, etc., and overlap welding, edge welding, etc., can be selected based on factors such as the location, angle, or structure of the welding area. In other embodiments of the present invention, the conductive part 22 and the electrode terminal 12 can also be electrically connected by other methods instead of welding, such as using a conductive adhesive or conductive nail. For the sake of simplicity, the following explanation will use the example that the conductive part 22 and the electrode terminal 12 are welded together to form an electrical connection, and the welding location is the electrical connection location between the conductive part 22 and the electrode terminal 12.

[0129] Specifically, the electrode terminal 12 specifically includes a first end wall 12111 and a first side wall 12113, the first end wall 12111 located on the side of the first side wall 12113 away from the active material coated portion 21, the first end wall 12111 and the first side wall 12113 surrounding each other to form a first housing groove 12110, and the electrical connection position between the conductive portion 22 and the electrode terminal 12 is located on the first end wall 12111 and / or the first side wall 12113. In other words, the conductive portion 22 may be welded to at least one of the first end wall 12111 and the first side wall 12113.

[0130] In the above technical solution, by providing the electrical connection position between the conductive part 22 and the electrode terminal 12 on at least one of the first end wall 12111 and the first side wall 12113, the first housing groove 12110 not only serves to house at least a part of the conductive part 22, but the groove wall of the first housing groove 12110 also serves to realize an electrical connection with the conductive part 22. This simplifies the structure of the electrode terminal 12, makes it easier to process, simplifies the structure of the conductive part 22, reduces redundancy in the conductive part 22, and lowers the cost of the conductive part 22. Furthermore, by realizing an electrical connection with the conductive part 22 using the groove wall of the first housing groove 12110, the area of ​​electrical connection between the conductive part 22 and the electrode terminal 12 can be set relatively large, which not only reduces the difficulty of electrical connection but also improves the reliability and stability of the electrical connection and improves the performance of the battery cell 10.

[0131] Furthermore, since the electrical connection position between the conductive part 22 and the electrode terminal 12 is located within the first housing groove 12110, it is possible to avoid the electrical connection position protruding outside the electrode terminal 12 and occupying space other than the electrode terminal 12. Moreover, the electrical connection position is protected by the electrode terminal 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the electrode terminal 12.

[0132] Furthermore, in the embodiment of the present application, the first end wall 12111 is configured as a closed structure in which no through hole 12130 is provided, thereby isolating the first housing groove 12110 from the external space of the housing 11 and reducing the problem of electrolyte leakage from the housing 11 through the first housing groove 12110.

[0133] Referring again to Figures 17 and 18, in several selectable embodiments, the local shape of the conductive portion 22 conforms to the local shape of the first end wall 12111 and is bonded to it to achieve an electrical connection, so that the location of the electrical connection between the conductive portion 22 and the first end wall 12111 extends along the length or width direction of the first end wall 12111. For example, when the first end wall 12111 is planar, the local portion of the conductive portion 22 may also be planar and bonded to the first end wall 12111, and the bonded position is electrically connected, for example, by welding. In this way, the area of ​​the electrical connection can be increased and the reliability and stability of the electrical connection can be improved.

[0134] Furthermore, if the electrical connection between the conductive portion 22 and the first end wall 12111 is welded, the first end wall 12111 is located on the side of the first housing groove 12110 away from the active material coated portion 21, making the welding operation easy. For example, welding can be performed from the side of the electrode terminal 12 away from the active material coated portion 21.

[0135] Furthermore, the shape of the first end wall 12111 is not limited and may be, for example, flat, arc-shaped, or the like. If the first end wall 12111 is a flat structure, it is positioned at an angle with respect to the axial radius R of the pole terminal 12. For example, it may be a flat structure perpendicular to the axial radius R of the pole terminal 12, or it may be an inclined plate structure not perpendicular to the axial radius R of the pole terminal 12, but the direction of inclination is not limited.

[0136] Naturally, in other embodiments of the present invention, the location of the electrical connection between the conductive portion 22 and the first end wall 12111 does not have to extend along the length or width of the first end wall 12111, but may be, for example, a plurality of discrete points. For example, the conductive portion 22 has a plurality of spaced portions, each welded to the first end wall 12111, which will not be described here.

[0137] Referring to Figure 19, which is a schematic local cross-sectional view of a battery cell 10 according to some embodiments of the present application. When the conductive portion 22 is electrically connected to the first end wall 12111, a first counterbore groove 12112 may be provided in the first end wall 12111, and the direction of recession of the first counterbore groove 12112 is away from the active material coated portion 21. At least a portion of the location of the electrical connection between the conductive portion 22 and the first end wall 12111 is located within the first counterbore groove 12112. Exemplarily, at least a portion of the conductive portion 22 may be provided within the first counterbore groove 12112 and connected to a portion of the first end wall 12111 used to define the first counterbore groove 12112.

[0138] In the above technical solution, on the one hand, the first counterbore groove 12112 can be used to pre-position and limit the position of the electrical connection position of the conductive part 22, which is advantageous not only for achieving precisely positioned electrical connections and improving production efficiency, but also for improving the stability and reliability of the conductive part 22 and improving the stability and reliability of the charging and discharging process of the battery cell 10. On the other hand, by providing the first counterbore groove 12112 in the first end wall 12111, the local thickness of the first end wall 12111 can be locally reduced, which is advantageous not only for welding, but also for reducing the weight of the electrode terminal 12 and improving the gravimetric energy density of the battery cell 10.

[0139] Referring again to Figures 18 and 19, in the embodiment of the present application, the pole terminal 12 is further provided with a first groove 126 depending on the requirements, the first groove 126 is located on the side of the pole terminal 12 away from the active material coated portion 21, that is, the surface of the pole terminal 12 on the side away from the active material coated portion 21 is the outer end face 123 of the pole terminal, and the groove opening of the first groove 126 is formed on the outer end face 123 of the pole terminal.

[0140] As can be understood, the first groove 126 is a groove body, and the groove body has a groove-like structure of a certain depth. Furthermore, when the electrode terminal 12 is provided on the upper end wall of the housing 11 and the outer end face 123 of the electrode terminal is the upper surface of the electrode terminal 12, the first groove 126 is formed as a first groove 126 in which the groove opening is open upward and the groove wall is recessed downward (i.e., recessed in a rectangular shape toward the electrode assembly 2). Also, for example, when the electrode terminal 12 is provided on the lower end wall of the housing 11 and the outer end face 123 of the electrode terminal is the lower surface of the electrode terminal 12, the first groove 126 is formed as a first groove 126 in which the groove opening is open downward and the groove wall is recessed upward (i.e., recessed in a rectangular shape toward the electrode assembly 2).

[0141] In the above technical solution, on the one hand, since the first groove 126 is provided in the electrode terminal 12, the weight of the electrode terminal 12 can be further reduced, improving the gravimetric energy density of the battery cell 10 and the battery 100. On the other hand, the first groove 126 is located on the outside of the electrode terminal 12, that is, it is open toward the side away from the inside of the housing 11 of the electrode terminal 12, and structural components that electrically connect each battery cell 10 in the battery 100 can be housed or attached using the first groove 126, thereby making full use of the space inside the electrode terminal 12 and improving the space utilization rate and volumetric energy density of the battery 100.

[0142] Furthermore, the electrode terminal 12 has both a first housing groove 12110 and a first recessed groove 126, the first recessed groove 126 is located on the side of the first housing groove 12110 away from the active material coated portion 21, and the first recessed groove 126 is open in the direction away from the first housing groove 12110. Therefore, it is advantageous to laser weld the conductive portion 22 and the first end wall 12111 via the first recessed groove 126 from the outside of the electrode terminal 12, i.e., from the side of the electrode terminal 12 away from the active material coated portion 21. In other words, it is easy to achieve an electrical connection between the conductive portion 22 and the electrode terminal 12 by external welding. In short, by providing the above structure, the electrode terminal 12 and the conductive portion 22 can be externally welded via the first recessed groove 126, making it easier to process and manufacture the battery cell 10 and saving on processing and manufacturing costs.

[0143] Furthermore, in order to easily and effectively weld the conductive portion 22 and the groove wall of the first housing groove 12110 via the first recessed groove 126 and to improve the reliability of the welding between the conductive portion 22 and the groove wall of the first housing groove 12110, in the embodiment of the present application, the portion between the first recessed groove 126 and the first housing groove 12110 can be laser-welded to the conductive portion 22. That is, the partition portion 127 shown in Figure 19 and the conductive portion 22 are laser-welded to realize an electrical connection between the electrode assembly 2 and the electrode terminal 12. The partition portion 127 located between the first groove 126 and the first housing groove 12110 of the pole terminal 12 is thin in thickness. The partition portion 127 separates the first groove 126 and the first housing groove 12110, and the wall surface of the partition portion 127 on the side closer to the active material coated portion 21 can be used as the first end wall 12111. When it is necessary to weld the conductive portion 22 to the first end wall 12111, the relatively thin thickness of the partition portion 127 is advantageous for achieving welding between the conductive portion 22 and the first end wall 12111 via the first groove 126, thereby improving the simplicity and reliability of welding.

[0144] Referring again to Figure 18, the battery cell 10 further includes a groove cover 7, which is provided on the electrode terminals 12 and covers the groove opening of the first recessed groove 126. In the above technical solution, by providing a groove cover 7 that covers the first recessed groove 126, the electrode terminals 12 achieve indirect electrical connection with the bus member via the groove cover 7, and by setting the position and structure of the groove cover 7, the electrical connection between the groove cover 7 and the bus member can be made easier and the area of ​​electrical connection can be made larger. As a result, by providing a groove cover 7, the electrical connection of adjacent battery cells 10 in the battery 100 can be made easier, and the position of the electrical connection between the battery cells 10 is located on the groove cover 7, and the position of the electrical connection between the conductive part 22 and the electrode terminals 12 is separated by the first recessed groove 126, so that interference between the two is reduced and the stability and reliability of the battery cell 10 can be further improved.

[0145] For illustrative purposes, refer to Figure 20, which is a schematic local cross-sectional view of a battery cell 10 according to some embodiments of the present application, wherein the housing portion 121 may be provided to include a second housing groove 12120, the surface of the electrode terminal 12 away from the active material coated portion 21 is the electrode terminal outer end face 123, the groove opening of the second housing groove 12120 is formed on the electrode terminal outer end face 123, the second housing groove 12120 communicates with the interior of the housing 11 via a through hole 12130, the conductive portion 22 is drilled in the through hole 12130 and at least a portion of it is housed in the second housing groove 12120.

[0146] As can be understood, the second housing groove 12120 is a groove body, and the groove body has a groove-like structure of a certain depth. For example, if the pole terminal 12 is provided on the upper end wall of the housing 11 and the outer end face 123 of the pole terminal is the upper surface of the pole terminal 12, the second housing groove 12120 is formed as a housing groove with a groove opening that is open upward and a groove wall that is recessed downward. Also, for example, if the pole terminal 12 is provided on the lower end wall of the housing 11 and the outer end face 123 of the pole terminal is the lower surface of the pole terminal 12, the second housing groove 12120 is formed as a housing groove with a groove opening that is open downward and a groove wall that is recessed upward.

[0147] In the above technical solution, referring again to Figure 20, on the one hand, the second housing groove 12120 is provided on the electrode terminal 12, which can reduce the weight of the electrode terminal 12 to some extent and improve the gravitational energy density of the battery cell 10 and the battery 100. On the other hand, the groove opening of the second housing groove 12120 is formed on the outer end surface 123 of the electrode terminal, and the outer end surface 123 is the surface of the electrode terminal 12 that is away from the active material coated portion 21. As a result, when at least a part of the conductive portion 22 is housed in the second housing groove 12120, the housing and arrangement of the conductive portion 22 can be easily realized through the groove opening of the second housing groove 12120, and electrical connection operations between the conductive portion 22 and the electrode terminal 12 can be easily realized through the groove opening of the second housing groove 12120, thereby reducing the difficulty of producing the battery cell 10 and improving the production efficiency of the battery cell 10.

[0148] At the same time, since the second housing groove 12120 can communicate with the inside of the housing 11 through the through hole 12130, the second housing groove 12120 can be used as a buffer and temporary storage structure for the electrolyte, allowing more electrolyte to be contained in the housing 11. As the electrolyte is consumed during the charging and discharging process of the battery cell 10, a larger amount of electrolyte can extend the service life of the battery cell 10. Furthermore, since the second housing groove 12120 can communicate with the inside of the housing 11 through the through hole 12130, the second housing groove 12120 can also be used as a containment and buffer structure for generated gases inside the electrode assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0149] Furthermore, if the housing portion 121 has a second housing groove 12120, and the conductive portion 22 is drilled in the through hole 12130 and at least a portion of it is housed within the second housing groove 12120, the position of the electrical connection between the conductive portion 22 and the electrode terminal 12 is not limited. For example, if the conductive portion 22 is drilled in the through hole 12130 and at least a portion of it is housed within the second housing groove 12120, in the embodiment of the present application, the position of the electrical connection between the conductive portion 22 and the electrode terminal 12 is located at the hole wall of the through hole 12130 formed in the electrode terminal 12.

[0150] In the above technical solution, by providing the electrical connection point between the conductive part 22 and the electrode terminal 12 on the wall of the through hole 12130, it is easier to operate the electrical connection between the conductive part 22 and the electrode terminal 12 via the second housing groove 12120. When the area of ​​the electrical connection between the conductive part 22 and the electrode terminal 12 is large, the through hole 12130 can be sealed using the electrical connection between the conductive part 22 and the electrode terminal 12, saving sealing costs, reducing electrolyte leakage, and saving on sealing parts.

[0151] Specifically, welding can be performed between the conductive part 22 and the hole wall of the through-hole 12130 at the position where the through-hole 12130 connects to the second housing groove 12120, making it easy to operate. Furthermore, by controlling the weld mark, the weld mark and the conductive part 22 can be used to seal the through-hole 12130, thereby improving the problem of electrolyte leakage from the housing 11 through the through-hole 12130.

[0152] Furthermore, as an example, if the conductive portion 22 is drilled in the through hole 12130 and at least a portion of it is housed in the second housing groove 12120, in another embodiment of the present application, the location of the electrical connection between the conductive portion 22 and the pole terminal 12 may be located at the groove wall of the second housing groove 12120 formed in the pole terminal 12. This facilitates the operation of the electrical connection, and, for example, when welding the conductive portion 22 to the groove wall of the second housing groove 12120 formed in the pole terminal 12, it is possible to improve the occurrence of problems such as conductive particles generated by welding entering the housing 11 and causing a short circuit.

[0153] Referring again to Figure 20, the electrode terminal 12 includes a second end wall 12121 and a second side wall 12123, the second end wall 12121 is located on the side of the second side wall 12123 closer to the active material coated portion 21, the second end wall 12121 and the second side wall 12123 surround each other to form a second housing groove 12120, the through hole 12130 is provided in the second end wall 12121, and the location of the electrical connection between the conductive portion 22 and the electrode terminal 12 is located in the second end wall 12121 and / or the second side wall 12123.

[0154] More specifically, the conductive part 22 and the electrode terminal 12 may be electrically connected by welding, and therefore the welding position is the position of the electrical connection between the conductive part 22 and the electrode terminal 12. In other embodiments of the present invention, the conductive part 22 and the electrode terminal 12 may be electrically connected by other methods instead of welding, such as using a conductive adhesive or conductive nail, and such a description is omitted here.

[0155] For the sake of simplicity, the following explanation will be based on the example that the conductive portion 22 and the electrode terminal 12 are welded together to form an electrical connection, and the welding position is the electrical connection position between the conductive portion 22 and the electrode terminal 12. For example, in some embodiments, the electrical connection position between the conductive portion 22 and the electrode terminal 12 is located at the second end wall 12121 and / or the second side wall 12123, and the conductive portion 22 may be welded to at least one of the second end wall 12121 and the second side wall 12123.

[0156] In the above technical solution, by providing the electrical connection position between the conductive part 22 and the electrode terminal 12 in at least one of the second end wall 12121 and the second side wall 12123, the second housing groove 12120 not only serves to accommodate at least a part of the conductive part 22, but the groove wall of the second housing groove 12120 further serves to realize an electrical connection with the conductive part 22, thereby simplifying the structure of the electrode terminal 12 and making it easier to process the electrode terminal 12. In addition, since the through hole 12130 is opened in the second end wall 12121, the conductive part 22 can easily enter the second housing groove 12120 through the through hole 12130, simplifying the structure of the conductive part 22, reducing the redundancy of the conductive part 22, and lowering the cost of the conductive part 22. Furthermore, the opening direction of the groove opening of the second housing groove 12120 makes it easier to operate the electrical connection between the conductive part 22 and the groove wall of the second housing groove 12120 through the groove opening of the second housing groove 12120, reducing the difficulty of electrical connection. Moreover, by utilizing the groove wall of the second housing groove 12120 to achieve electrical connection with the conductive part 22, the area of ​​electrical connection between the conductive part 22 and the electrode terminal 12 can be relatively enlarged, improving the reliability and stability of the electrical connection and improving the performance of the battery cell 10.

[0157] Furthermore, since the electrical connection position between the conductive part 22 and the electrode terminal 12 is located within the second housing groove 12120, it is possible to avoid the electrical connection position protruding outside the electrode terminal 12 and occupying space other than the electrode terminal 12. Moreover, the electrical connection position is protected by the electrode terminal 12, improving the reliability and stability of the electrical connection between the conductive part 22 and the electrode terminal 12.

[0158] Referring again to Figure 20, in some embodiments, the local shape of the conductive portion 22 is matched to the local shape of the second end wall 12121 and is bonded to it to achieve an electrical connection, so that the location of the electrical connection between the conductive portion 22 and the second end wall 12121 extends along the length or width direction of the second end wall 12121. For example, when the second end wall 12121 is planar, the local part of the conductive portion 22 may also be planar and is bonded to the second end wall 12121, and the bonded position is electrically connected, for example, by welding. In this way, the area of ​​the electrical connection can be increased and the reliability and stability of the electrical connection can be improved.

[0159] Furthermore, the shape of the second end wall 12121 is not limited and may be, for example, a flat plate or an arc-shaped plate structure. If the second end wall 12121 is a flat plate structure, it is positioned at an angle with respect to the axial radius R of the pole terminal 12. For example, it may be a flat plate structure perpendicular to the axial radius R of the pole terminal 12, or it may be an inclined flat plate structure not perpendicular to the axial radius R of the pole terminal 12, but the direction of inclination is not limited.

[0160] For example, referring again to Figure 20, if the second end wall 12121 has a flat plate structure, the angle θ between the second end wall 12121 and the axial R of the pole terminal 12 is equal to 90°, meaning that the second end wall 12121 and the active material coated portion 21 are equally spaced along the direction from the through hole 12130 to the second side wall 12123. This facilitates welding of the conductive portion 22 and the second end wall 12121.

[0161] Furthermore, for example, if the angle θ between the second end wall 12121 and the axial radius R of the electrode terminal 12 is greater than 90°, that is, along the direction from the through hole 12130 to the second side wall 12123, the second end wall 12121 extends inclined toward the active material coated portion 21. This increases the extension distance of the conductive portion 22 along the second end wall 12121, thereby improving the reliability of the electrical connection. Exemplarily, the angle θ between the second end wall 12121 and the axial radius R of the electrode terminal 12 may be 90° to 145°, for example, 100°, 110°, 120°, 130°, 140°, etc. On the one hand, the second end wall 12121 is easier to process and electrical connection with the conductive portion 22 is easier, and on the other hand, the conductive portion 22 can be accommodated by making full use of the space inside the electrode terminal 12.

[0162] Furthermore, for example, if the angle θ between the second end wall 12121 and the axial radius R of the pole terminal 12 is less than 90°, that is, along the direction from the through hole 12130 to the second side wall 12123, the second end wall 12121 will extend inclined toward the direction away from the active material coated portion 21.

[0163] This increases the extension distance of the conductive portion 22 along the second end wall 12121, thereby improving the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial radius R of the electrode terminal 12 may be 45° to 90°, for example, 50°, 60°, 70°, 80°, etc. On the one hand, the second end wall 12121 is easier to process and electrical connection with the conductive portion 22 is easier, and on the other hand, the conductive portion 22 can be accommodated by making full use of the space inside the electrode terminal 12.

[0164] Naturally, the present application is not limited thereto, and in other embodiments of the present application, the location of the electrical connection between the conductive portion 22 and the second end wall 12121 does not have to extend along the length or width direction of the second end wall 12121, but may be, for example, a plurality of discretely provided points, for example the conductive portion 22 having a plurality of spaced portions, each welded to the second end wall 12121, which will not be described here.

[0165] Referring again to Figure 20, and further to Figure 21, Figure 21 is a schematic local cross-sectional view of a battery cell 10 according to several embodiments of the present application. Regardless of the specific value of the angle θ between the second end wall 12121 and the axial R of the electrode terminal 12, in the embodiments of the present application, when the conductive portion 22 is electrically connected to the second end wall 12121, a second counterbore groove 12122 may be provided in the second end wall 12121 as needed, the second counterbore groove 12122 being a recess formed by a local portion of the second end wall 12121 sinking toward one end closer to the active material coated portion 21. At least a portion of the location of the electrical connection between the conductive portion 22 and the second end wall 12121 is located within the second counterbore groove 12122.

[0166] In the above technical solution, the portion of the conductive part 22 located within the second counterbore groove 12122 is provided to conform to the shape of the second counterbore groove 12122 and bonded together to achieve electrical connection. The second counterbore groove 12122 is used to pre-position and limit the position of the electrical connection of the conductive part 22, which is advantageous for achieving accurate electrical connection, improves production efficiency, improves the stability and reliability of the electrical connection position, and improves the reliability and stability of the charging and discharging operation of the battery cell 10.

[0167] Referring again to Figure 21, in the embodiments of the present application, the connection method between the pole terminal 12 and the housing 11 is not limited and may be, for example, welded or riveted. For example, when the two are fitted together by riveting, the housing 11 has a through hole 113 and the pole terminal 12 is attached to the through hole 113 by riveting. It should be understood that when the two are fitted together by welding or other means, the housing 11 may have a through hole 113 and the pole terminal 12 is attached to the through hole 113.

[0168] Selectively, referring again to Figure 20, the second housing groove 12120 may be provided corresponding to the position of the through hole 113, in other words, in a projection plane with an axial R perpendicular to the pole terminal 12, the orthographic projection of the second housing groove 12120 lies within the range of the orthographic projection of the through hole 113, the second housing groove 12120 has a greater depth to accommodate more conductive parts 22, and furthermore, the space occupied by the conductive parts 22 within the housing 11 can be reduced more significantly.

[0169] In some embodiments, referring again to Figure 20, when the housing 11 has a through hole 113 and the pole terminal 12 is mounted in the through hole 113, the depth H3 of the second housing groove 12120 is greater than or equal to the minimum distance H4 from the outer end face 123 of the pole terminal to the through hole 113 along the axial R of the pole terminal 12.

[0170] The specific shape of the second storage groove 12120 is not limited and may be regular or irregular. For example, it may be a columnar groove with a rectangular, elliptical, or track-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional size, a hemispherical groove with a circular cross-section and gradually changing cross-sectional size, or a semi-elliptical groove with an elliptical cross-section and gradually changing cross-sectional size. Furthermore, the track-shaped shape described herein refers to a shape in which the two short sides of a rectangle are replaced with curves that bulge outwards.

[0171] Therefore, the depth H3 of the second housing groove 12120 is the maximum depth of the second housing groove 12120 along the axial radius R of the electrode terminal 12. In the axial radius R of the electrode terminal 12, the depth H3 of the second housing groove 12120 is greater than or equal to the minimum distance H4 from the outer end face 123 of the electrode terminal to the through hole 113, so the volume of the electrode terminal 12 can be fully utilized, the second housing groove 12120 has a large depth which is advantageous for accommodating more conductive parts 22, can further reduce the space occupied by the conductive parts 22 within the housing 11, can further improve the energy density of the battery cell 10 and further reduce the redundancy of the conductive parts 22 within the housing 11, and at the same time, because the second housing groove 12120 has a large depth, it can accommodate the generated gas of the electrode assembly 2, can improve the reliability and stability of the battery cell 10, and can accommodate more electrolyte, can improve the service life of the battery cell 10.

[0172] Referring to Figure 21 and then to Figure 22, Figure 22 is a schematic local cross-sectional view of a battery cell 10 according to several embodiments of the present application. In embodiments of the present application, if the housing portion 121 has the second housing groove 12120 of any of the above embodiments, the battery cell 10 optionally further includes a cover plate 13, the cover plate 13 is fitted onto the electrode terminals 12, closes the groove opening of the second housing groove 12120, and the cover plate 13 is electrically connected to the electrode terminals 12.

[0173] In the above technical solution, by providing the cover plate 13 and closing the groove opening of the second housing groove 12120, leakage of electrolyte from the housing 11 through the groove opening of the second housing groove 12120 can be reduced. Since the cover plate 13 closes the groove opening of the second housing groove 12120 and is electrically connected to the electrode terminal 12, an indirect electrical connection between the electrode terminal 12 and the bus member can be easily realized using the cover plate 13, which is advantageous in increasing the connection area of ​​the electrical connection point and further advantageous in reducing the resistance of the electrical connection point.

[0174] Furthermore, the fitting method and position between the cover plate 13 and the electrode terminal 12 are not limited, as long as the cover plate 13 can close the groove opening of the second housing groove 12120. For example, in some embodiments, the cover plate 13 may be welded to the electrode terminal 12. During processing, the conductive portion 22 is first passed through the through hole 12130 and welded to the groove wall of the second housing groove 12120, and then the cover plate 13 is welded to the electrode terminal 12 to close the groove opening of the second housing groove 12120.

[0175] The specific structure of the cover plate 13 is not limited. For example, in several selectable embodiments, referring to Figure 22, the cover plate 13 includes a first conductive member 131 and a second conductive member 132 made of different materials, the first conductive member 131 being fitted to the pole terminal 12 and electrically connected, and the second conductive member 132 being fitted to the first conductive member 131 and electrically connected.

[0176] In the above technical solution, the cover plate 13 is provided in a composite form, and by setting the material of the first conductive member 131 to be the same as that of the electrode terminal 12, electrical connection between the first conductive member 131 and the electrode terminal 12 is made easier, and the first conductive member 131 and the electrode terminal 12 can be easily, reliably, and stably connected by welding, for example. Furthermore, because the materials of the second conductive member 132 and the first conductive member 131 are different, electrical connection to bus members and the like with materials different from the electrode terminal 12 can be made using the second conductive member 132, and the second conductive member 132 can be reliably and stably connected to bus members with the same material as the second conductive member 132 by welding, for example.

[0177] For example, if the electrode terminal 12 is a negative electrode terminal 12, and the electrode terminal 12 is a copper column and the bus member is an aluminum piece, then the first conductive member 131 can be made of copper and the second conductive member 132 can be made of aluminum. In this case, if the electrode terminal 12 and the first conductive member 131 are made of the same material, they can be effectively welded together, and if the second conductive member 132 and the bus member are made of the same material, they can be effectively welded together, thereby effectively realizing an indirect electrical connection between the electrode terminal 12 and the bus member via the cover plate 13. Furthermore, the electrode terminal 12 and the first conductive member 131 are welded together from copper, which has good fluidity, is less prone to cracking, and is advantageous in improving the sealing effect of the welded area.

[0178] Referring again to Figure 22, in several selectable examples, the first conductive member 131 is located between the second housing groove 12120 and the second conductive member 132. In the above technical solution, since the first conductive member 131 is located between the second housing groove 12120 and the second conductive member 132, it can separate the second housing groove 12120 and the second conductive member 132, thereby reducing contact between the electrolyte in the housing 11 and the second conductive member 132 when the electrolyte enters the second housing groove 12120 from the through hole 12130, thereby solving the problem of the electrolyte corroding the second conductive member 132.

[0179] Furthermore, the fitting method between the first conductive member 131 and the second conductive member 132 is not limited. For example, in some embodiments, referring to Figure 22, the first conductive member 131 has a second groove 1311, the second conductive member 132 is fitted into the second groove 1311, and the groove opening of the second groove 1311 is formed on the surface of the first conductive member 131 away from the second housing groove 12120, thereby exposing the second conductive member 132 from the groove opening of the second groove 1311. Alternatively, in other embodiments, the connection method between the first conductive member 131 and the second conductive member 132 may be a fastening connection, a locking connection, etc.

[0180] Furthermore, the phrase "exposed" of the second conductive member 132 from the groove opening of the second recess 1311 means that the first conductive member 131 does not need to shield the second conductive member 132 at the groove opening position of the second recess 1311, and it is not required that the second conductive member 132 protrude from the groove opening of the second recess 1311. For example, the second conductive member 132 may be flush with the surface of the first conductive member 131 on the side away from the second housing groove 12120, and the second conductive member 132 may protrude from the surface of the first conductive member 131 on the side away from the second housing groove 12120.

[0181] In the above technical solution, on the one hand, by fitting the second conductive member 132 into the first conductive member 131, the difficulty of assembling the first conductive member 131 and the second conductive member 132 can be reduced, the stability and ease of fitting the first conductive member 131 and the second conductive member 132 can be improved, and the thickness of the cover plate 13 can be reduced, the space occupied by the cover plate 13 can be reduced, and the space utilization rate of the battery cell 10 can be improved. On the other hand, since the second conductive member 132 can be exposed from the surface of the first conductive member 131 away from the second housing groove 12120 through the groove opening of the second recess 1311, it is advantageous for electrical connection between the second conductive member 132 and the bus member outside the electrode terminal 12.

[0182] Furthermore, since the groove opening of the second groove 1311 is formed on the surface of the first conductive member 131 away from the second housing groove 12120, this indicates that the second groove 1311 is open in the direction away from the active material coated portion 21. As a result, the portion of the groove wall that defines the second groove 1311 of the first conductive member 131 is located between the second housing groove 12120 and the second conductive member 132, separating the second housing groove 12120 and the second conductive member 132, preventing the electrolyte in the second groove 1311 from coming into contact with the second conductive member 132, and reducing electrolyte leakage.

[0183] Naturally, in other embodiments, the cover plate 13 does not have to be a composite form made of multiple materials. For example, in other embodiments of the present application, the entire cover plate 13 may be provided as a non-composite form processed from the same material, for example, to fit the positive electrode terminal 12, but this will not be explained here.

[0184] Referring again to Figure 22, the cover plate 13 is fitted into the groove opening of the second housing groove 12120. In the above technical solution, by fitting the cover plate 13 into the second housing groove 12120, the difficulty of assembling the cover plate 13 and the electrode terminal 12 is reduced, the stability of the assembly of the cover plate 13 and the electrode terminal 12, and the reliability and simplicity of the connection can be improved, and the space occupied by the cover plate 13 other than the electrode terminal 12 can be reduced. In addition, since the cover plate 13 is fitted into the groove opening of the second housing groove 12120, there can be sufficient space to accommodate the conductive part 22 within the second housing groove 12120.

[0185] Naturally, in other embodiments of the present invention, the fitting method between the cover plate 13 and the electrode terminal 12 is not limited to fitting within the second housing groove 12120. The cover plate 13 may be placed directly over the outside of the electrode terminal 12, that is, directly over the groove opening of the second housing groove 12120, and only needs to be easily fitted with the bus member of the battery 100. This embodiment is not limited.

[0186] According to some embodiments of the present application, the present application further provides a battery 100 including a battery cell 10 according to the above embodiment.

[0187] In the technical solution according to the embodiment of the present invention, by providing a gas guide groove 81 in the mounting wall 114, the gas guide groove 81 can guide the air inside the housing 11 to flow to the explosion-proof valve 6, improving the exhaust efficiency of the battery cell 10 and enabling rapid depressurization of the battery cell 10. Compared to providing a gas guide assembly separately inside the battery cell 10, forming a gas guide section 80 by opening a gas guide groove 81 in the mounting wall 114 helps to reduce the space occupied by the gas guide section 80 inside the battery cell 10.

[0188] According to some embodiments of the present application, the present application further provides a power consumption device that includes a battery 100 of the above solution used to supply electrical energy. The power consumption device may be any of the above devices or systems that use a battery.

[0189] In the technical solution according to the embodiment of the present invention, by providing a gas guide groove 81 in the mounting wall 114, the gas guide groove 81 can guide the air inside the housing 11 to flow to the explosion-proof valve 6, improving the exhaust efficiency of the battery cell 10 and enabling rapid depressurization of the battery cell 10. Compared to providing a gas guide assembly separately inside the battery cell 10, forming a gas guide section 80 by opening a gas guide groove 81 in the mounting wall 114 helps to reduce the space occupied by the gas guide section 80 inside the battery cell 10.

[0190] According to some embodiments of the present application, a battery cell 10 is provided, which includes a housing 11, an electrode assembly 2, an explosion-proof valve 6, and a gas flow section 80, wherein the electrode assembly 2 is provided inside the housing 11.

[0191] The housing 11 includes a housing body 111 and a housing cover 112, the housing body 111 having an opening 1110, the housing cover 112 covering the opening 1110 to form the internal environment of the battery cell 10, the electrode assembly 2 being provided in the internal environment, the housing cover 112 forming a mounting wall 114, the explosion-proof valve 6 including a pressure reducing groove 60 which is opened in the mounting wall 114, the gas guide section 80 including a gas guide groove 81 which is opened in the mounting wall 114, and the gas guide groove 81 is used to guide the gas generated from the electrode assembly 2 into the pressure reducing groove 60.

[0192] By performing a process such as laser cutting or numerical control pressing on the mounting wall 114, a pressure-reducing groove 60 and a gas flow groove 81 can be formed on the mounting wall 114. The mounting wall 114 includes a first wall portion 1143 and a second wall portion 1144. After the gas flow groove 81 is provided on the mounting wall 114, the wall portion of the mounting wall 114 facing the gas flow groove 81 in the Z direction is the first wall portion 1143. After the pressure-reducing groove 60 is provided on the mounting wall 114, the wall portion of the mounting wall 114 facing the pressure-reducing groove 60 in the Z direction is the second wall portion 1144, and the second wall portion 1144 is formed as an explosion-proof valve 6.

[0193] By making the depth H1 of the gas flow groove 81 smaller than the depth H2 of the pressure-reducing groove 60, the thickness of the first wall portion 1143 is controlled to be greater than the thickness of the second wall portion 1144. Furthermore, the structural strength of the first wall portion 1143 is made greater than that of the second wall portion 1144. As a result, when the gas inside the battery cell 10 reaches a critical value, the gas will preferentially penetrate the second wall portion 1144, that is, it will preferentially destroy the explosion-proof valve 6.

[0194] In some embodiments, both the gas guide groove 81 and the pressure reducing groove 60 are provided on the side of the mounting wall 114 facing the inner cavity of the housing 11, while in another embodiment, the gas guide groove 81 is provided on the side of the mounting wall 114 facing the inner cavity of the housing 11, and the pressure reducing groove 60 is provided on the side of the mounting wall 114 facing away from the inner cavity of the housing 11.

[0195] The pressure reducing groove 60 includes a first pressure reducing groove 61 and a second pressure reducing groove 62 that are arranged to intersect each other. The first pressure reducing groove 61 extends along the length of the mounting wall 114, and the second pressure reducing groove 62 extends along the width of the mounting wall 114. The first pressure reducing groove 61 and the second pressure reducing groove 62 are in communication with each other. This arrangement helps to increase the area of ​​the first pressure reducing groove 61 and the second pressure reducing groove 62, thereby increasing the area of ​​the explosion-proof valve 6. The gas is uniformly distributed within the first pressure reducing groove 61 and the second pressure reducing groove 62. When the gas in the battery cell 10 reaches a critical value, a large opening 1110 is easily formed when the gas breaks through the explosion-proof valve 6, thus facilitating rapid pressure reduction of the battery cell 10.

[0196] The gas guide groove 81 includes a first gas guide groove section 811 and a second gas guide groove section 812. The first gas guide groove section 811 extends along the length direction of the mounting wall 114, and the second gas guide groove section 812 extends along the width direction of the mounting wall 114. The first gas guide groove section 811 and the second gas guide groove section 812 are in communication with each other. This arrangement helps to increase the volume of the gas guide groove 81, allowing the gas guide groove 81 to accommodate more gas and easily improve the flow efficiency of the gas guide groove 81. Gas in the second gas guide groove 81 can enter the first gas guide groove 81 and flow along the first gas guide groove 81 to the explosion-proof valve 6.

[0197] The gas guide section 80 includes two gas guide sections 80, and the explosion-proof valve 6 is located between the two gas guide sections 80. The explosion-proof valve 6 may be located at the center of the mounting wall 114, or it may be positioned off-center from the center of the mounting wall 114. The specific position is determined according to actual needs and is not limited thereto.

[0198] When the explosion-proof valve 6 is installed off-center at the center of the mounting wall 114, the area of ​​the gas flow section 80 on one side of the explosion-proof valve 6 is large, and the area of ​​the gas flow section 80 on the other side of the explosion-proof valve 6 is small.

[0199] Finally, it should be noted that the above embodiments are merely for illustrating, and not limiting, the technical solutions of the present application. While the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that it is still possible to modify the technical solutions described in the above embodiments, or to substitute some or all of their technical features, and such modifications or substitutions do not cause the substance of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included within the scope of the claims and specification of the present application. In particular, the technical features mentioned in each embodiment can all be combined in any way, provided there is no structural inconsistency. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions included in the claims. [Explanation of Symbols]

[0200] 1000 vehicles, Battery 100, controller 200, motor 300, Battery cell 10, Housing 11, housing body 111, opening 1110, housing cover 112, through hole 113, mounting wall 114, first wall portion 1143, second wall portion 1144, mounting hole 115, 12 pole terminal, 1201 positive pole terminal, 1202 negative pole terminal, housing section 121, first housing groove 12110, first end wall 12111, first counterbore groove 12112, first side wall 12113, second housing groove 12120, second end wall 12121, second counterbore groove 12122, second side wall 12123, through hole 12130, inner end face of pole terminal 122, outer end face of pole terminal 123, first recessed groove 126, partition section 127, annular groove 128, Cover plate 13, first conductive member 131, second groove 1311, second conductive member 132, Housing 20, first part 201, second part 202, Electrode assembly 2, active material coated part 21, conductive part 22, Bracket 3, through hole 314, insulating member 4, explosion-proof valve 6, pressure reducing groove 60, first pressure reducing groove section 61, second pressure reducing groove section 62, groove cover 7, gas flow section 80, gas flow groove 81, first gas flow groove section 811, second gas flow groove section 812.

Claims

1. Housing including mounting wall, An electrode assembly provided within the housing, An explosion-proof valve provided on the aforementioned mounting wall, The mounting wall includes a gas guide section including a gas guide groove, The gas guide groove is used to guide the gas generated from the electrode assembly to the explosion-proof valve in the battery cell.

2. The battery cell according to claim 1, wherein the explosion-proof valve includes a pressure-reducing groove formed in the mounting wall.

3. The battery cell according to claim 2, wherein the depth of the gas flow groove is smaller than the depth of the pressure-reducing groove.

4. The battery cell according to claim 2 or 3, wherein both the gas flow groove and the pressure reducing groove are provided on the side of the mounting wall facing the inner cavity of the housing.

5. The battery cell according to claim 2 or 3, wherein the gas flow groove is provided on the mounting wall facing the inner cavity of the housing, and the pressure reducing groove is provided on the mounting wall facing away from the inner cavity of the housing.

6. The battery cell according to claim 2 or 3, wherein the gas guide groove and the pressure reducing groove are spaced apart, or the gas guide groove and the pressure reducing groove are in communication.

7. The battery cell according to claim 2 or 3, wherein the pressure-reducing groove includes a first pressure-reducing groove portion and a second pressure-reducing groove portion that are arranged to intersect.

8. The battery cell according to claim 7, wherein the first pressure reducing groove extends along the longitudinal direction of the mounting wall, and the second pressure reducing groove extends along the width direction of the mounting wall.

9. The gas guide groove and the explosion-proof valve are arranged in the longitudinal direction of the mounting wall, and the gas guide groove is A battery cell according to any one of claims 1 to 3, comprising a first gas flow channel extending along the longitudinal direction of the mounting wall.

10. The battery cell according to claim 9, wherein the number of first gas guide grooves is multiple, and the multiple first gas guide grooves are arranged at intervals in the width direction of the mounting wall.

11. The battery cell according to claim 10, wherein in each of the gas guide grooves, the distance between any two adjacent first gas guide grooves is the same.

12. The battery cell according to claim 10, wherein in each of the gas guide grooves, the distance between at least two adjacent first gas guide grooves is different from the distance between two other adjacent first gas guide grooves.

13. The gas guide groove further includes a second gas guide groove section, The battery cell according to claim 9, wherein the second gas guide groove extends along the width direction of the mounting wall, one end of the first gas guide groove away from the explosion-proof valve communicates with the second gas guide groove, and the other end extends toward the explosion-proof valve.

14. The battery cell according to any one of claims 1 to 3, wherein the gas guide portion includes two, the two gas guide portions are spaced apart in the longitudinal direction of the mounting wall, and the explosion-proof valve is located between the two gas guide portions.

15. The battery cell according to claim 14, wherein the explosion-proof valve is provided at the center of the mounting wall in the longitudinal direction, the structure of the two gas flow sections is the same, and they are arranged symmetrically with respect to the center of the explosion-proof valve.

16. The mounting wall has a first end and a second end that are opposite to each other in its longitudinal direction, and the distance between the explosion-proof valve and the first end is greater than the distance between the explosion-proof valve and the second end. The battery cell according to claim 14, wherein the area of ​​the gas guide portion located between the explosion-proof valve and the first end is larger than the area of ​​the gas guide portion located between the explosion-proof valve and the second end.

17. The battery cell according to any one of claims 1 to 3, wherein the housing includes a housing cover and a housing body having an opening, the housing cover is placed over the opening, and the mounting wall is located on the housing cover or the housing body.

18. The housing includes a housing cover and a housing body having an opening, the housing cover is placed over the opening, the mounting wall is located on the housing cover, and a pole terminal is provided on the wall of the housing body facing the mounting wall, and a housing portion is provided in the pole terminal. The battery cell according to any one of claims 1 to 3, wherein the electrode assembly includes an active material coated portion and a conductive portion connected to the active material coated portion, and at least a portion of the conductive portion enters the housing portion and is connected to the electrode terminal.

19. The battery cell according to claim 18, wherein the housing portion includes a first housing groove, the surface of the electrode terminal facing the active material coated portion is the inner end face of the electrode terminal, the groove opening of the first housing groove is formed on the inner end face of the electrode terminal, and at least a portion of the conductive portion is housed in the first housing groove.

20. The battery cell according to claim 18, wherein the housing portion includes a second housing groove, the surface of the electrode terminal away from the active material coated portion is the outer end surface of the electrode terminal, the groove opening of the second housing groove is formed on the outer end surface of the electrode terminal, the second housing groove communicates with the inside of the housing through a through hole, and the conductive portion is drilled in the through hole and at least a portion of it is housed in the second housing groove.

21. A battery comprising a battery cell according to any one of claims 1 to 3.

22. A power consumption device including a battery as described in claim 21.

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