Battery monomer, battery with battery monomer and power utilization device

Abstract

The invention discloses a single battery, a battery with the single battery and a power utilization device, and the single battery comprises a shell which comprises a mounting wall; the electrode assembly is arranged in the shell; the anti-explosion valve is arranged on the mounting wall; and the gas guide part comprises a gas guide groove formed in the mounting wall, and the gas guide groove is used for guiding gas generated by the electrode assembly to the explosion-proof valve. According to the technical scheme, air in the shell can be guided to flow to the anti-explosion valve, the air guide grooves are formed in the mounting walls, so that the exhaust efficiency of the battery monomers is improved, the pressure relief efficiency of the battery monomers is improved, and compared with a mode that one air guide assembly is independently arranged in each battery monomer, the pressure relief efficiency of the battery monomers is improved. And the air guide grooves are formed in the mounting walls to form the air guide parts, so that the space occupied by the air guide parts in the battery single bodies can be conveniently reduced.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development. In the related technology, when thermal runaway occurs in the battery cell, the pressure relief speed of the battery cell is slow.

[0003] Application Contents

[0004] In view of the above problems, the present application provides a battery cell and a battery and an electrical device having the same. By arranging an air guide groove on the mounting wall, the air guide groove can guide the air in the shell to flow to the explosion-proof valve, thereby improving the exhaust efficiency of the battery cell and realizing rapid pressure relief of the battery cell. Compared with separately arranging an air guide component inside the battery cell, an air guide groove is opened on the mounting wall to form an air guide part, which is convenient for reducing the space occupied by the air guide part in the battery cell.

[0005] In a first aspect, the present application provides a battery cell, comprising: a shell including a mounting wall; an electrode assembly disposed in the shell; an explosion-proof valve disposed on the mounting wall; and an air guide portion including an air guide groove opened on the mounting wall, wherein the air guide groove is used to guide the gas generated by the electrode assembly to the explosion-proof valve.

[0006] In the technical solution of the embodiment of the present application, the gas guide groove and the explosion-proof valve are both arranged on the installation wall, so that the gas guide groove is arranged near the explosion-proof valve, so that the gas guide groove can conveniently and quickly guide the gas to the vicinity of the explosion-proof valve, and then when the gas inside the battery cell reaches a critical value, the gas can quickly gather near the explosion-proof valve and break through the explosion-proof valve to achieve rapid pressure relief of the battery cell. Compared with separately setting a gas guide component inside the battery cell, opening a gas guide groove on the installation wall to form a gas guide part is convenient to reduce the space occupied by the gas guide part in the battery cell.

[0007] In some embodiments, the explosion-proof valve includes a pressure relief groove opened in the installation wall.

[0008] In the technical solution of the embodiment of the present application, by arranging a pressure relief groove on the mounting wall, a wall surface with low structural strength can be formed on the mounting wall. When the air pressure in the battery cell reaches a critical value, the gas will preferentially break through the wall surface with low structural strength on the mounting wall, thereby destroying the explosion-proof valve, so that the interior of the battery cell is connected with the external environment, and the gas inside the battery cell can reach the external environment, thereby achieving pressure relief of the battery cell.

[0009] In some embodiments, a depth of the air guide groove is less than a depth of the pressure relief groove.

[0010] In the technical solution of the embodiment of the present application, when the gas pressure in the battery cell reaches a critical value, the gas preferentially breaks through the wall portion on the mounting wall opposite to the pressure relief groove, thereby reducing the possibility of the gas breaking through the wall portion on the mounting wall opposite to the gas guide groove, thereby reducing the influence of the gas guide groove on the explosion-proof valve.

[0011] In some embodiments, the air guide groove and the pressure relief groove are both arranged on a side of the installation wall facing the inner cavity of the shell.

[0012] In the technical solution of the embodiment of the present application, the gas guide groove and the pressure relief groove are located on the same side, and the gas guide groove can guide the gas into the pressure relief groove, so that the gas is evenly distributed in the pressure relief groove, and then the gas is evenly gathered at the explosion-proof valve, so that when the gas pressure in the battery cell reaches a critical value, the gas forms a larger opening when breaking through the explosion-proof valve, thereby facilitating the rapid pressure relief of the battery cell.

[0013] In some embodiments, the air guide groove is arranged on a side of the installation wall facing the inner cavity of the shell, and the pressure relief groove is arranged on a side of the installation wall facing away from the inner cavity of the shell.

[0014] In the technical solution of the embodiment of the present application, the side of the installation wall facing away from the inner cavity of the shell, that is, the outer side of the shell, makes it easy to confirm the position of the pressure relief groove on the shell, and then facilitates the confirmation of the position of the explosion-proof valve. In this way, when installing the battery cell, it is convenient to use the position of the explosion-proof valve to determine the relative position of the battery cell.

[0015] In some embodiments, the air guide groove and the pressure relief groove are arranged at intervals.

[0016] In the technical solution of the embodiment of the present application, the wall thickness of the portion between the gas guide groove and the pressure relief groove on the mounting wall can be kept unchanged, thereby ensuring the structural strength of the mounting wall, so as to reduce the possibility of deformation of the mounting wall, and enable the gas guide groove on the mounting wall to smoothly guide the gas to the pressure relief groove.

[0017] In some embodiments, the air guide groove and the pressure relief groove are in communication.

[0018] In the technical solution of the embodiment of the present application, the gas can flow directly into the pressure relief groove along the gas guide groove, which is convenient for improving the gas guide efficiency and realizing the rapid pressure relief of the battery cell.

[0019] In some embodiments, the pressure relief groove includes a first pressure relief groove segment and a second pressure relief groove segment arranged crosswise.

[0020] In the technical solution of the embodiment of the present application, this facilitates the connection between the first pressure relief groove section and the second pressure relief groove section, and at the same time facilitates the increase of the area of ​​the explosion-proof valve, so that the gas can be evenly distributed in the first pressure relief groove section and the second pressure relief groove section. When the gas pressure in the battery cell reaches a critical value, the gas forms a larger opening when breaking through the explosion-proof valve, thereby facilitating the rapid pressure relief of the battery cell.

[0021] In some embodiments, the first pressure relief groove section extends along the length direction of the installation wall, and the second pressure relief groove section extends along the width direction of the installation wall.

[0022] In the technical solution of the embodiment of the present application, the angle formed between the first pressure relief trough section and the second pressure relief trough section is 90°, which makes it easy to reduce the resistance encountered by the gas when flowing between the first pressure relief trough section and the second pressure relief trough section, thereby allowing the gas to be quickly and evenly distributed in the first pressure relief trough section and the second pressure relief trough section.

[0023] In some embodiments, the air guide groove and the explosion-proof valve are arranged in the length direction of the installation wall, and the air guide groove includes: a first air guide groove section, and the first air guide groove section extends along the length direction of the installation wall.

[0024] In the technical solution of the embodiment of the present application, the gas can flow along the first gas guide groove section from one end of the installation wall in the length direction to the explosion-proof valve, so as to guide the gas at the end of the battery cell farther from the explosion-proof valve to the explosion-proof valve, so that the gas can gather at the explosion-proof valve.

[0025] In some embodiments, there are multiple first air guide groove segments, and the multiple first air guide groove segments are arranged at intervals in the width direction of the installation wall.

[0026] In the technical solution of the embodiment of the present application, this facilitates increasing the gas guiding range of the gas guiding groove, and further facilitates increasing the gas guiding efficiency of the gas guiding groove, so that the gas guiding groove can quickly guide the gas to the pressure relief groove, and further facilitates increasing the pressure relief speed.

[0027] In some embodiments, in each of the air guiding grooves, the distance between any two adjacent first air guiding groove sections is equal.

[0028] In the technical solution of the embodiment of the present application, the plurality of first gas guide groove segments can uniformly guide the gas generated by the electrode assembly, and further can uniformly guide the gas to the explosion-proof valve.

[0029] In some embodiments, in each of the air guiding grooves, a distance between at least two adjacent first air guiding groove segments is not equal to a distance between another two adjacent first air guiding groove segments.

[0030] In the technical solution of the embodiment of the present application, in some cases, the gas generated in some areas inside the battery cell may be relatively large, so that the multiple first gas guide segments in the corresponding areas on the mounting wall are densely arranged along the width direction of the mounting wall, which can increase the efficiency of gas diversion in the area and smoothly guide the gas to the explosion-proof valve.

[0031] In some embodiments, the air guide groove also includes: a second air guide groove section, the second air guide groove section extends along the width direction of the mounting wall, the first air guide groove section is connected to the second air guide groove section at one end away from the explosion-proof valve and the other end extends toward the explosion-proof valve.

[0032] In the technical solution of the embodiment of the present application, a second air guide groove section is provided to increase the volume of the air guide groove, so that the air guide groove can accommodate more gas, thereby facilitating improving the flow guidance efficiency, wherein the gas in the second air guide groove can enter the first air guide groove and flow along the first air guide groove to the explosion-proof valve.

[0033] In some embodiments, the air guide parts include two, the two air guide parts are arranged at intervals in the length direction of the installation wall, and the explosion-proof valve is located between the two air guide parts.

[0034] In the technical solution of the embodiment of the present application, the gas at both ends of the explosion-proof valve can flow toward the explosion-proof valve along the corresponding gas guide grooves, thereby facilitating the improvement of the gas guide efficiency and the pressure relief speed of the battery cell.

[0035] In some embodiments, the explosion-proof valve is disposed at a central position in the length direction of the installation wall, and the two air guide portions have the same structure and are symmetrically arranged about the center of the explosion-proof valve.

[0036] In the technical solution of the embodiment of the present application, the two air guide parts can evenly guide the gas on both sides of the explosion-proof valve to the explosion-proof valve, thereby reducing the possibility of airflow blockage in the air guide channel, thereby improving the air guide efficiency and the pressure relief efficiency of the battery cell.

[0037] In some embodiments, the mounting wall has a first end and a second end that are relatively arranged in a length direction thereof, 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; wherein the area of ​​the air guide portion between the explosion-proof valve and the first end is greater than the area of ​​the air guide portion between the explosion-proof valve and the second end.

[0038] In the technical solution of the embodiment of the present application, it is convenient to adaptively increase the area of ​​the air guide portion in a part of the installation wall, so as to improve the flow conduction efficiency of this part of the area to adapt to the situation where there is more gas in a certain area inside the battery cell.

[0039] In some embodiments, the shell includes a shell cover and a shell body having an opening, the shell cover covers the opening, and the mounting wall is located on the shell cover or the shell body.

[0040] In the technical solution of the embodiment of the present application, when the gas in the battery cell reaches a critical value, the gas can break through the explosion-proof valve on the installation wall, thereby achieving pressure relief for the battery cell.

[0041] In some embodiments, the shell includes a shell cover and a shell body with an opening, the shell cover covers the opening, the mounting wall is located on the shell cover, and a pole is provided on the wall of the shell body opposite to the mounting wall, and the pole is provided with a receiving portion; the electrode assembly includes an active material coating portion and a conductive portion connected to the active material coating portion, and at least a portion of the conductive portion extends into the receiving portion and is connected to the pole.

[0042] In the technical solution of the embodiment of the present application, by accommodating at least part of the conductive part in the accommodating part, the space occupied by the battery cell itself can be reduced, so that a battery of the same volume can accommodate a larger number of battery cells, and the volume energy density of the battery can be improved; in addition, at least part of the conductive part is accommodated in the accommodating part to occupy the space in the pole, which can reduce the redundancy of the conductive part in the shell to at least a certain extent, reduce the probability of short circuit between the conductive part and the active material coating part, reduce the probability of short circuit in the battery cell, and improve the working reliability and stability of the battery cell and the battery.

[0043] In some embodiments, the accommodating portion includes a first accommodating groove, the surface of the pole facing the active material coating portion is the inner end face of the pole, the notch of the first accommodating groove is formed on the inner end face of the pole, and at least part of the conductive portion is accommodated in the first accommodating groove.

[0044] In the above technical solution, on the one hand, the first receiving groove is provided on the pole to reduce the weight of the pole to a certain extent, so as to improve the weight energy density of the battery cell and the battery; on the other hand, since the notch of the first receiving groove is formed on the inner end face of the pole, and the inner end face of the pole is the surface of the pole close to the active material coating part, the first receiving groove can be opened toward the active material coating part, thereby facilitating the conductive part to extend into the first receiving groove, thereby improving assembly efficiency. Moreover, this type of first receiving groove is easy to process and improves production efficiency.

[0045] In some embodiments, the accommodating portion includes a second accommodating groove, the surface of the pole away from the active material coating portion is the outer end face of the pole, the notch of the second accommodating groove is formed on the outer end face of the pole, the second accommodating groove is connected to the interior of the shell through a through hole, the conductive portion is passed through the through hole and is at least partially accommodated in the second accommodating groove.

[0046] In the above technical solution, on the one hand, the pole is provided with a second receiving groove, which can reduce the weight of the pole to a certain extent, so as to improve the weight energy density of the battery cell and the battery; on the other hand, since the notch of the second receiving groove is formed on the outer end face of the pole, and the outer end face of the pole is the surface of the pole away from the active material coating part, the second receiving groove can be open in the direction away from the active material coating part. In this way, when at least part of the conductive part is accommodated in the second receiving groove, the conductive part can be easily stored and sorted through the notch of the second receiving groove, and the electrical connection operation between the conductive part and the pole can be easily achieved through the notch of the second receiving groove, thereby reducing the difficulty of producing the battery cell and improving the production efficiency of the battery cell.

[0047] In a second aspect, the present application provides a battery, including a battery cell of the above-mentioned embodiment. By providing an air guide groove on the mounting wall, the air guide groove can guide the air in the housing to flow to the explosion-proof valve, thereby improving the exhaust efficiency of the battery cell and achieving rapid pressure relief of the battery cell. Compared with providing a separate air guide component inside the battery cell, providing an air guide groove on the mounting wall to form an air guide portion is convenient for reducing the space occupied by the air guide portion in the battery cell.

[0048] In a third aspect, the present application provides an electrical device, including the battery of the above embodiment. By providing an air guide groove on the mounting wall, the air guide groove can guide the air in the housing to flow to the explosion-proof valve, thereby improving the exhaust efficiency of the battery cell and achieving rapid pressure relief of the battery cell. Compared with providing a separate air guide component inside the battery cell, providing an air guide groove on the mounting wall to form an air guide portion is convenient for reducing the space occupied by the air guide portion in the battery cell.

[0049] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0051] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0052] Figure 2 An exploded view of a battery according to some embodiments of the present application;

[0053] Figure 3 A schematic diagram of the structure of a battery cell in some embodiments of the present application;

[0054] Figure 4 A structural cross-sectional view of a battery cell provided in some embodiments of the present application;

[0055] Figure 5 An exploded view of the structure of a battery cell according to some embodiments of the present application;

[0056] Figure 6 A schematic diagram of the structure of a battery cell in some embodiments of the present application;

[0057] Figure 7 This is a schematic diagram of the structure of the installation wall of some embodiments of the present application;

[0058] Figure 8 This is a schematic diagram of the structure of the installation wall of some embodiments of the present application;

[0059] Fig. 9 for Figure 8 Sectional view at AA in the middle;

[0060] Fig.10 for Fig. 9 A magnified view of the middle area;

[0061] Fig.11 This is a schematic diagram of the structure of the installation wall of some embodiments of the present application;

[0062] Fig.12 This is a schematic diagram of the structure of the installation wall of some embodiments of the present application;

[0063] Fig.13 This is a schematic diagram of the structure of the installation wall of some embodiments of the present application;

[0064] Fig.14 This is a schematic diagram of the structure of the installation wall of some embodiments of the present application;

[0065] Fig.15 A schematic diagram of the structure of a battery cell in some embodiments of the present application;

[0066] Fig.16 for Fig.15 Sectional view at the middle BB;

[0067] Fig.17 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0068] Fig.18 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0069] Fig.19 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0070] Fig. 20 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0071] Fig.21 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0072] Fig. 22 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application.

[0073] Reference numerals: vehicle 1000;

[0074] Battery 100, controller 200, motor 300;

[0075] Battery cell 10;

[0076] Shell 11, shell body 111, opening 1110, shell cover 112, through hole 113, mounting wall 114, first wall portion 1143, second wall portion 1144, mounting hole 115;

[0077] Pole 12, positive pole 1201, negative pole 1202, accommodating portion 121, first accommodating groove 12110, first end wall 12111, first sinking groove 12112, first side wall 12113, second accommodating groove 12120, second end wall 12121, second sinking groove 12122, second side wall 12123, through hole 12130, pole inner end surface 122, pole outer end surface 123, first groove 126, spacer 127, annular groove 128;

[0078] Cover plate 13, first conductive member 131, second groove 1311, second conductive member 132;

[0079] Box body 20, first part 201, second part 202;

[0080] Electrode assembly 2, active material coating portion 21, conductive portion 22;

[0081] Bracket 3, through hole 314, insulating member 4, explosion-proof valve 6, pressure relief groove 60, first pressure relief groove section 61, second pressure relief groove section 62, groove cover 7, air guide portion 80, air guide groove 81, first air guide groove section 811, second air guide groove section 812. DETAILED DESCRIPTION

[0082] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0083] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0084] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0085] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0086] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0087] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0088] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0089] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0090] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0091] The battery cell is generally provided with an explosion-proof valve, which is used to release the internal pressure of the battery cell when the internal pressure or temperature of the battery cell reaches a threshold. In the related art, the gas in the battery cell takes a long time to flow to the explosion-proof valve and be discharged from the explosion-proof valve to achieve pressure relief of the battery cell. In other words, the pressure relief speed of the battery cell is slow and the pressure relief time is long.

[0092] In order to increase the pressure relief speed of the battery cell, the present application sets a gas guide groove near the explosion-proof valve, and uses the gas guide groove to guide the gas in the battery cell so that the gas in the battery cell can flow along the gas guide groove to the explosion-proof valve. This makes it easier for the gas to be discharged from the explosion-proof valve in an orderly manner, thereby facilitating the exhaust speed of the battery cell and increasing the pressure relief speed of the battery cell.

[0093] The battery disclosed in the embodiments of the present application is used as a power source for an electrical device or various energy storage systems using the battery as an energy storage element. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0094] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0095] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0096] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0097] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided for some embodiments of the present application. The battery 100 includes a case 20 and a battery cell 10, and the battery cell 10 is contained in the case 20. Among them, the case 20 is used to provide a storage space for the battery cell 10, and the case 20 can adopt a variety of structures. In some embodiments, the case 20 may include a first part 201 and a second part 202, and the first part 201 and the second part 202 cover each other, and the first part 201 and the second part 202 jointly define a storage space for accommodating 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, and the first part 201 covers the open side of the second part 202, so that the first part 201 and the second part 202 jointly define a storage space; the first part 201 and the second part 202 may also be hollow structures with one side open, and the open side of the first part 201 covers the open side of the second part 202. Of course, the box body 20 formed by the first part 201 and the second part 202 can be in various shapes, such as a cylinder, a cuboid, etc.

[0098] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 10 is accommodated in the box 20; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 10 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 20. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 10.

[0099] Each battery cell 10 may be a secondary battery or a primary battery, or 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, flat, rectangular, or in other shapes.

[0100] Please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of a battery cell 10 provided in some embodiments of the present application. Figure 4 The structure cross-sectional view of a battery cell 10 provided in 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.

[0101] The shell cover 112 refers to a component that covers the opening of the shell body 111 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the shell cover 112 can be adapted to the shape of the shell body 111 to match the shell body 111. Optionally, the shell cover 112 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the shell cover 112 is not easily deformed when squeezed and collided, so that the battery cell 10 can have a higher structural strength and the reliability performance can also be improved.

[0102] The shell cover 112 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application embodiment does not impose any special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the shell cover 112, and the insulating member can be used to isolate the electrical connection components in the shell body 111 from the shell cover 112 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0103] The shell body 111 is a component used to cooperate with the shell cover 112 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 2, electrolyte and other components. Functional components such as the pole 12 are provided on the shell body 111. The pole 12 can be used to be electrically connected to the electrode assembly 2 to output or input electrical energy of the battery cell 10. The shell 11 is provided with an explosion-proof valve 6, which is used to release the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value.

[0104] The shell body 111 and the shell cover 112 may be independent components, and an opening 1110 may be provided on the shell body 111, and the shell cover 112 may cover the opening at the opening 1110 to form an internal environment of the battery cell 10. Without limitation, the shell cover 112 and the shell body 111 may be integrated, and specifically, the shell cover 112 and the shell body 111 may form a common connection surface before other components are inserted into the shell, and when the interior of the shell body 111 needs to be encapsulated, the shell cover 112 may cover the shell body 111.

[0105] The shell body 111 can be in various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, etc. Specifically, the shape of the shell body 111 can be determined according to the specific shape and size of the electrode assembly 2. The shell body 111 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0106] The electrode assembly 2 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 2 may be included in the shell 111. The electrode assembly 2 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0107] like Figure 3 and Figure 4The battery cell 10 also includes a bracket 3, an insulating member 4 and an explosion-proof valve 6. The bracket 3 is arranged at one end of the active material coating portion 21. The bracket 3 is provided with a through hole 314, and the pole ear 22 can pass through the through hole 314 to connect with the pole 12. The insulating member 4 is connected to the bracket 3 and wrapped together in the circumference of the electrode assembly 2. The insulating member 4 can be used to isolate the electrical connection components in the shell 11 from the shell 11 to reduce the risk of short circuit. Exemplarily, the insulating member 4 can be plastic, rubber, etc. Among them, the insulating member 4 and the bracket 3 can be connected by bonding or hot melt. Of course, the insulating member 4 and the bracket 3 can also be connected in other ways. The explosion-proof valve 6 is arranged on the shell 11, and the explosion-proof valve 6 is used to release the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. Among them, the explosion-proof valve 6 can be arranged on the shell cover 112 or on the shell body 111.

[0108] Please refer to Figure 5 and Figure 6 , Figure 5 This is a structural explosion diagram of a battery cell 10 according to some embodiments of the present application. Figure 6 The schematic diagram of the structure of the battery cell 10 of some embodiments of the present application. The present application provides a battery cell 10. The battery cell 10 includes a housing 11, and the housing 11 includes a mounting wall 114, which refers to a wall of the housing 11.

[0109] The battery cell 10 also includes an electrode assembly 2, an explosion-proof valve 6 and an air guide portion 80. The electrode assembly 2 is arranged in the shell 11, the explosion-proof valve 6 is arranged on the installation wall 114, and the air guide portion 80 includes an air guide groove 81. The air guide groove 81 is opened on the installation wall 114, and the air guide groove 81 is used to guide the gas generated by the electrode assembly 2 to the explosion-proof valve 6.

[0110] The electrode assembly 2 is a component in the battery cell 10 where electrochemical reactions occur. During the charge and discharge process of the battery, the active material coating portion 21 in the electrode assembly 2 reacts with the electrolyte and produces gas. When thermal runaway occurs in the battery cell 10, the gas expands due to heat, causing the gas pressure in the battery cell 10 to increase.

[0111] The explosion-proof valve 6 is arranged on the installation wall 114. When the pressure inside the battery cell 10 is higher than the critical value, the pressure inside the battery cell 10 can break through the explosion-proof valve 6. At this time, the inside of the shell 11 is connected to the external environment to achieve pressure relief of the battery cell 10. The explosion-proof valve 6 can improve the safety of the use of the battery cell 10 and reduce the possibility of explosion of the battery cell 10.

[0112] The gas guide groove 81 is opened on the installation wall 114. By performing laser cutting or CNC stamping on the installation wall 114, the gas guide groove 81 can be formed on the installation wall 114 to form a space that can be used to accommodate gas on the installation wall 114. At the same time, when the internal pressure of the battery cell 10 is relatively large, under the action of the air pressure, the gas guide groove 81 can guide the gas generated by the electrode assembly 2 to the explosion-proof valve 6 to gather the gas at the explosion-proof valve 6. Then, when the air pressure in the battery cell 10 reaches a critical value, the air pressure in the battery cell 10 can quickly flow to the explosion-proof valve 6 and break through the explosion-proof valve 6 to achieve rapid pressure relief of the battery cell 10.

[0113] Among them, the gas guide groove 81 and the explosion-proof valve 6 are both arranged on the installation wall 114, so that the gas guide groove 81 is arranged near the explosion-proof valve 6, so that the gas guide groove 81 can conveniently and quickly guide the gas to the vicinity of the explosion-proof valve 6, and then when the gas inside the battery cell 10 reaches a critical value, the gas can quickly gather at the explosion-proof valve 6 and break through the explosion-proof valve 6 to achieve rapid pressure relief of the battery cell 10.

[0114] In addition, compared with separately setting up an air guide component inside the battery cell 10, opening an air guide groove 81 on the mounting wall 114 to form an air guide portion 80 facilitates reducing the space occupied by the air guide portion 80 in the battery cell 10, thereby reserving a larger space for the electrode assembly 2, and further facilitates increasing the capacity of the battery cell 10.

[0115] Please continue to refer to Figure 6 , and further reference Figure 7 , Figure 7 This is a schematic structural diagram of the installation wall 114 of some embodiments of the present application. The explosion-proof valve 6 includes a pressure relief groove 60 opened in the installation wall 114 .

[0116] By performing laser cutting or CNC stamping on the mounting wall 114 , a pressure relief groove 60 can be formed on the mounting wall 114 . The wall surface of the mounting wall 114 opposite to the pressure relief groove 60 is thinner, and the structural strength of this area is lower. When the air pressure in the battery cell 10 reaches a critical value, the gas will preferentially break through the thinner wall surface of the mounting wall 114 .

[0117] When the gas pressure in the battery cell 10 reaches a critical value, the gas will preferentially break through the wall surface with lower structural strength on the mounting wall 114, that is, break through the wall surface on the mounting wall 114 opposite to the pressure relief groove 60, and then destroy the explosion-proof valve 6, so that the interior of the battery cell 10 is connected with the external environment, thereby achieving pressure relief of the battery cell 10.

[0118] Please refer to Figure 8 , Fig. 9 and Fig.10 , Figure 8This is a schematic diagram of the structure of the installation wall 114 in some embodiments of the present application. Fig. 9 for Figure 8 The cross-sectional view at AA in the middle. Fig.10 for Fig. 9 In the enlarged view of the middle part, the depth H1 of the air guide groove 81 is smaller than the depth H2 of the pressure relief groove 60 .

[0119] The thickness of the mounting wall 114 is H, and the thickness of the mounting wall 114 extends along the Z direction. The depths of the air guide groove 81 and the pressure relief groove 60 extend along the Z direction. The mounting wall 114 includes a first wall portion 1143 and a second wall portion 1144. After the air guide groove 81 is provided on the mounting wall 114, the wall portion of the mounting wall 114 opposite to the air guide groove 81 in the Z direction is the first wall portion 1143. After the pressure relief groove 60 is provided on the mounting wall 114, the wall portion of the mounting wall 114 opposite to the pressure relief 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.

[0120] Among them, the thickness of the first wall portion 1143 is H-H1, and the thickness of the second wall portion 1144 is H-H2, so that the depth H1 of the air guide groove 81 is smaller than the depth H2 of the pressure relief groove 60, so as to control the thickness of the first wall portion 1143 to be greater than the thickness of the second wall portion 1144, and then make the structural strength of the first wall portion 1143 greater than the structural strength of the second wall portion 1144. In this way, when the air pressure in the battery cell 10 reaches the critical value, the gas will first break through the second wall portion 1144, that is, the explosion-proof valve 6 will be destroyed first.

[0121] Specifically, after determining the critical value of the battery cell 10, it is only necessary to control the thickness, material, etc. of the second wall portion 1144 so that the air pressure in the battery cell 10 can break through the second wall portion 1144 when it reaches the critical value, and make the depth H1 of the gas guide groove 81 smaller than the depth H2 of the pressure relief groove 60, that is, make the thickness of the first wall portion 1143 larger than the thickness of the second wall portion 1144, thereby reducing the possibility of the gas in the battery cell 10 breaking through the first wall portion 1143.

[0122] Please continue to refer to Figure 8 , and further reference Fig.11 , Fig.11 This is a schematic structural diagram of the installation wall 114 of some embodiments of the present application. The air guide groove 81 and the pressure relief groove 60 are both arranged on the side of the installation wall 114 facing the inner cavity of the shell 11.

[0123] The gas guide groove 81 is used to guide the gas generated by the electrode assembly 2 to the pressure relief groove 60, so that the gas guide groove 81 and the pressure relief groove 60 are located on the same side, so that the gas guide groove 81 can evenly guide the gas to the pressure relief groove 60, so that the gas can be evenly distributed in the pressure relief groove 60, and then the gas is evenly gathered at the explosion-proof valve 6, so that when the gas pressure in the battery cell 10 reaches a critical value, the gas can form a larger opening 1110 when breaking through the explosion-proof valve 6, thereby facilitating the rapid pressure relief of the battery cell 10.

[0124] Please continue to refer to Fig. 9 and Fig.10 The thickness direction of the mounting wall 114 extends in the up-down direction. In the up-down direction, the opening 1110 of the air guide groove 81 and the opening 1110 of the pressure relief groove 60 face the top of the mounting wall 114. A first wall portion 1143 is defined between the bottom wall of the mounting groove and the lower bottom wall of the mounting wall 114. A second wall portion 1144 is defined between the bottom wall of the pressure relief groove 60 and the lower bottom wall of the mounting wall 114.

[0125] Please continue to refer to Figure 5-Figure 7 , and refer to Fig.12 , Fig.12 This is a structural schematic diagram of the mounting wall 114 of some embodiments of the present application. The air guide groove 81 is provided on the side of the mounting wall 114 facing the inner cavity of the shell 11, and the pressure relief groove 60 is provided on the side of the mounting wall 114 facing away from the inner cavity of the shell 11.

[0126] The side of the installation wall 114 facing away from the inner cavity of the shell 11, that is, the outer side of the shell 11, makes it easy to confirm the position of the pressure relief groove 60 on the shell 11, and then facilitates the confirmation of the position of the explosion-proof valve 6. In this way, when the battery cell 10 is installed, it is convenient to use the position of the explosion-proof valve 6 to determine the relative position of the battery cell 10.

[0127] Among them, the thickness direction of the mounting wall 114 extends in the up-down direction. In the up-down direction, the opening 1110 of the air guide groove 81 faces the top of the mounting wall 114, and the opening 1110 of the pressure relief groove 60 faces the bottom of the mounting wall 114. A first wall portion 1143 is defined between the bottom wall of the mounting groove 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 relief groove 60 and the upper wall of the mounting wall 114.

[0128] Please continue to refer to Figure 8 In some embodiments of the present application, the air guide groove 81 and the pressure relief groove 60 are arranged at intervals.

[0129] The wall thickness of the portion of the mounting wall 114 between the gas guide groove 81 and the pressure relief groove 60 has not been processed to be thinner, thereby ensuring the structural strength of the wall surface between the gas guide groove 81 and the pressure relief groove 60 on the mounting wall 114, so as to reduce the possibility of deformation of the mounting wall 114, and enable the gas guide groove 81 located on the mounting wall 114 to smoothly guide the gas to the pressure relief groove 60.

[0130] In other embodiments of the present application, the air guide groove 81 is connected to the pressure relief groove 60 .

[0131] The gas can flow along the gas guide groove 81 toward the pressure relief groove 60 and flow into the pressure relief groove 60 , which facilitates improving the gas guide efficiency and realizing rapid pressure relief of the battery cell 10 .

[0132] Please continue to refer to Figure 7 and Figure 8 The pressure relief groove 60 includes a first pressure relief groove section 61 and a second pressure relief groove section 62 which are arranged crosswise.

[0133] The cross arrangement means that the first pressure relief trough section 61 and the second pressure relief trough section 62 have an intersection, the first pressure relief trough section 61 and the second pressure relief trough section 62 can extend along a straight line, the angle between the first pressure relief trough section 61 and the second pressure relief trough section 62 can be a right angle or an acute angle, and the first pressure relief trough section 61 and the second pressure relief trough section 62 can also extend along a curve.

[0134] The first pressure relief groove section 61 and the second pressure relief groove section 62 are arranged crosswise, which is convenient for realizing the connection between the first pressure relief groove section 61 and the second pressure relief groove section 62, and at the same time, it is convenient to increase the area of ​​the explosion-proof valve 6, so that the gas can be evenly distributed in the first pressure relief groove section 61 and the second pressure relief groove section 62. When the gas pressure in the battery cell 10 reaches a critical value, it is convenient for the gas to form a larger opening 1110 when breaking through the explosion-proof valve 6, thereby facilitating the rapid pressure relief of the battery cell 10.

[0135] Please continue to refer to Figure 7 and Figure 8 The first pressure relief groove section 61 extends along the length direction of the installation wall 114 , and the second pressure relief groove section 62 extends along the width direction of the installation wall 114 .

[0136] The angle formed between the first pressure relief trough section 61 and the second pressure relief trough section 62 is 90°, which makes it easy to reduce the resistance encountered by the gas when flowing between the first pressure relief trough section 61 and the second pressure relief trough section 62, thereby allowing the gas to be quickly and evenly distributed in the first pressure relief trough section 61 and the second pressure relief trough section 62.

[0137] Please continue to refer to Figure 8The pressure relief groove 60 includes a first pressure relief groove section 61 and three second pressure relief groove sections 62. The first pressure relief groove section 61 extends in the left-right direction, the second pressure relief groove section 62 extends in the front-back direction, and the three second pressure relief groove sections 62 are arranged at intervals in the left-right direction. The first pressure relief groove section 61 is connected to the middle parts of the three second pressure relief groove sections 62, so that the gas in the first pressure relief groove section 61 can flow to the second pressure relief groove section 62, and the gas in the second pressure relief groove section 62 can also flow to the first pressure relief groove section 61 to balance the air pressure between the first pressure relief groove section 61 and the second pressure relief groove section 62, so as to reduce the probability of a high air pressure in a certain area of ​​the pressure relief groove 60, so as to evenly distribute the gas in the first pressure relief groove section 61 and the second pressure relief groove section 62. When the air pressure in the battery cell 10 reaches a critical value, the gas can evenly break through the explosion-proof valve 6 and form a larger opening 1110, thereby facilitating the rapid pressure relief of the battery cell 10.

[0138] Please continue to refer to Figure 8 and Fig.11 The air guide groove 81 and the explosion-proof valve 6 are arranged in the length direction of the installation wall 114 . The air guide groove 81 includes a first air guide groove section 811 . The first air guide groove section 811 extends along the length direction of the installation wall 114 .

[0139] The X direction is the length direction of the installation wall 114, and the Y direction is the width direction of the installation wall 114. The gas guide groove 81 and the explosion-proof valve 6 are arranged in the X direction. The gas guide groove 81 can guide the gas generated by the electrode assembly 2 to the explosion-proof valve 6 along the X direction. The gas can flow from one end of the length direction of the installation wall 114 to the explosion-proof valve 6 along the first gas guide groove section 811, so as to guide the gas at the end of the battery cell 10 farther from the explosion-proof valve 6 to the explosion-proof valve 6, so that the gas can gather at the explosion-proof valve 6.

[0140] Please continue to refer to Figure 8 and Fig.11 There are multiple first air guide groove sections 811 , and the multiple first air guide groove sections 811 are arranged at intervals in the width direction of the installation wall 114 .

[0141] The width direction of the mounting wall 114 extends along the Y direction, the length direction of the mounting wall 114 extends along the X direction, the first air guide groove extends along the X direction, and the plurality of first air guide grooves are arranged at intervals along the Y direction, so as to increase the air guide range of the air guide groove 81, and further increase the air guide efficiency of the air guide groove 81. The air guide groove 81 can quickly guide the gas to the pressure relief groove 60, and further increase the pressure relief speed of the battery cell.

[0142] Please continue to refer to Figure 8 , and further reference Fig.13 , Fig.13This is a schematic structural diagram of the installation wall 114 of some embodiments of the present application. In each air guide groove 81 , the distance between any two adjacent first air guide groove sections 811 is equal.

[0143] The multiple first gas guide groove segments 811 extend along the Y direction, and the distance between two adjacent first gas guide groove segments 811 along the Y direction is equal, so that the multiple first gas guide groove segments 811 can uniformly guide the gas generated by the electrode assembly 2, and then uniformly guide the gas to the explosion-proof valve 6.

[0144] Please refer to Fig.14 , Fig.14 This is a schematic structural diagram of the mounting wall 114 of some embodiments of the present application. In each air guide groove 81 , the distance between at least two adjacent first air guide groove sections 811 is not equal to the distance between another two adjacent first air guide groove sections 811 .

[0145] The plurality of first air guiding slot segments 811 extend along the Y direction, and a distance between at least two adjacent first air guiding slot segments 811 in the Y direction is not equal to a distance between another two adjacent first air guiding slot segments 811 in the Y direction.

[0146] Among them, the distance between at least two adjacent first air guide groove segments 811 is not equal to the distance between another two adjacent first air guide groove segments 811, that is, the multiple first air guide groove segments 811 in a part of the area on the installation wall 114 are arranged more densely in the Y direction, and the multiple first air guide groove segments 811 in a part of the area are arranged more sparsely in the Y direction, so as to carry out targeted guidance of gas at different positions.

[0147] In some cases, more gas may be generated in some areas of the battery cell 10, so that multiple first gas guide segments in the corresponding areas on the mounting wall 114 are densely arranged along the Y direction, which can increase the efficiency of the first gas guide groove segment 811 in guiding the gas in the area, so as to smoothly guide the gas to the explosion-proof valve 6.

[0148] Please continue to refer to Figure 8 , Fig.13 and Fig.14 The air guide groove 81 also includes a second air guide groove section 812, which extends along the width direction of the installation wall 114. One end of the first air guide groove section 811 away from the explosion-proof valve 6 is connected to the second air guide groove section 812 and the other end extends toward the explosion-proof valve 6.

[0149] The second air guide groove section 812 extends along the Y direction, the first air guide groove section 811 extends along the X direction, and the end of the first air guide groove section 811 away from the explosion-proof valve 6 is connected to the second air guide groove section 812. The second air guide groove section 812 is provided to increase the volume of the air guide groove 81, so that the air guide groove 81 can accommodate more gas, thereby facilitating the improvement of the flow guiding efficiency of the air guide groove 81, wherein the gas in the second air guide groove 81 can enter the first air guide groove 81 and flow toward the explosion-proof valve 6 along the first air guide groove 81.

[0150] Please continue to refer to Figure 8 , Fig.13 and Fig.14 The air guide parts 80 include two air guide parts 80 , which are arranged at intervals in the length direction of the installation wall 114 , and the explosion-proof valve 6 is located between the two air guide parts 80 .

[0151] The two gas guide grooves 81 are arranged at intervals in the X direction. In the X direction, the explosion-proof valve 6 is located between the two gas guide parts 80. The gas guide grooves 81 of the two gas guide parts 80 can guide the gas at both ends of the explosion-proof valve 6 in the X direction, so that the gas located at both ends of the explosion-proof valve 6 in the X direction flows toward the explosion-proof valve 6 along the corresponding gas guide grooves 81, thereby facilitating further improving the gas guide efficiency and increasing the pressure relief speed of the battery cell 10.

[0152] Please continue to refer to Figure 8 The explosion-proof valve 6 is arranged at the central position in the length direction of the installation wall 114 , and the two air guide portions 80 have the same structure and are arranged symmetrically about the center of the explosion-proof valve 6 .

[0153] The center line of the explosion-proof valve 6 extends along the Y direction, and the two air guide portions 80 have the same structure and are arranged symmetrically about the center of the explosion-proof valve 6, so that the two air guide portions 80 can evenly guide the gas located on both sides of the explosion-proof valve 6 in the X direction, so that the gas can evenly flow to the explosion-proof valve 6, reducing the possibility of air flow blockage in the air guide channel, thereby facilitating the improvement of the air guide efficiency and the pressure relief efficiency of the battery cell 10.

[0154] Please continue to refer to Fig.13 and Fig.14 The mounting wall 114 has a first end and a second end which are arranged opposite to each other in the length direction thereof, and 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, wherein the area of ​​the air guide portion 80 between the explosion-proof valve 6 and the first end is greater than the area of ​​the air guide portion 80 between the explosion-proof valve 6 and the second end.

[0155] The first end and the second end of the mounting wall 114 are the two ends in the length direction of the mounting wall 114, and the length direction of the mounting wall 114 extends in the left-right direction. 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, and S1 is not equal to S2.

[0156] In some cases, more gas may be generated in some areas of the battery cell 10. If the gas on the left side of the battery cell 10 is more than the gas on the right side of the battery cell 10, 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, that is, S1>S2, and the area of ​​the air guide portion 80 located on the left side of the mounting wall 114 is greater than the area of ​​the air guide portion 80 located on the right side of the mounting wall 114, so as to increase the area of ​​the air guide portion 80 on the left side of the mounting wall 114, thereby improving the flow guidance efficiency of the gas on the left side of the battery cell 10, and thus being able to adapt to the situation where there is more gas on the left side of the battery cell 10.

[0157] Of course, if the gas on the right side of the battery cell 10 is more than the gas on the left side of the battery cell 10, then S2>S1, and the area of ​​the air guide portion 80 located on the right side of the mounting wall 114 is larger than the area of ​​the air guide portion 80 located on the left side of the mounting wall 114, so as to increase the area of ​​the air guide portion 80 on the right side of the mounting wall 114, thereby facilitating the improvement of the flow guidance efficiency of the gas on the right side of the battery cell 10, and thus being able to adapt to the situation where there is more gas on the right side of the battery cell 10.

[0158] Please refer to Figure 5 , and continue to refer to Fig.15 and Fig.16 , Fig.15 This is a schematic diagram of the structure of a battery cell 10 in some embodiments of the present application. Fig.16 for Fig.15 In the cross-sectional view taken at BB, the housing 11 includes a housing cover 112 and a housing body 111 having an opening 1110 . The housing cover 112 covers the opening 1110 , and the mounting wall 114 is located on the housing cover 112 or the housing body 111 .

[0159] The shell cover 112 is used to cover the opening 1110 to form an internal environment of the battery cell 10 . When the gas in the battery cell 10 reaches a critical value, the gas can break through the explosion-proof valve 6 on the mounting wall 114 , thereby achieving pressure relief for the battery cell 10 .

[0160] The installation wall 14 may be disposed on the shell cover 112 , or the installation wall 114 may be a side wall of the shell body 111 adjacent to the shell cover 112 , and no further restrictions are imposed herein.

[0161] Please refer to Figure 5The mounting wall 114 is located on the shell cover 112, and the pole 12 is arranged on the wall of the shell body 111 opposite to the opening 1110. The pole 12 and the mounting wall 114 are located at both ends of the battery cell 10 to space the pole 12 and the explosion-proof valve 6. In this way, when the gas gathers at the explosion-proof valve 6, the impact of the gas on the pole 12 can be reduced.

[0162] In addition, the shell cover 112 is smaller in volume than the shell body 11 , and it is simpler to process the shell cover 112 to form the air guide groove 81 and the pressure relief groove 60 , thereby reducing the processing difficulty.

[0163] Please refer to Figure 5 , and continue to refer to Fig.17 and Fig.18 , Fig.17 A partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. The figure is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. The shell 11 includes a shell cover 112 and a shell body 111 having an opening 1110, the shell cover 112 covers the opening 1110, the mounting wall 114 is located on the shell cover 112, and a pole 12 is provided on the wall of the shell body 111 opposite to the mounting wall 114, and the pole 12 is provided with a receiving portion 121, at least a portion of the conductive portion 22 extends into and is received in the receiving portion 121, and the conductive portion 22 is electrically connected to the pole 12. In other words, the pole 12 is set as a hollow structure.

[0164] Among them, at least partially means that the conductive part 22 can be completely accommodated in the accommodating part 121, or part of the conductive part 22 can be accommodated in the accommodating part 121. Since the pole 12 is provided with the accommodating part 121, the hollow structure of the accommodating part 121 can reduce the weight of the pole 12 to a certain extent, so as to improve the weight energy density of the battery cell 10 and the battery 100. On the other hand, the conductive part 22 can be accommodated in the accommodating part 121, which improves the assembly efficiency of the conductive part 22, saves the space occupied by the conductive part 22, and makes full use of the space of the battery cell 10, so that the structure of the battery cell 10 is more compact, which is more conducive to the improvement of the energy density of the battery cell 10.

[0165] More specifically, part or all of the conductive part 22 is contained in the containing part 121, so that the part of the conductive part 22 located in the containing part 121 can occupy the space in the pole 12, which can reduce the space occupied by the conductive part 22 in the shell 11. When the size of the shell 11 is fixed, some space can be saved in the shell 11 to accommodate a larger active material coating part 21, thereby improving the volume energy density of the battery cell 10. For example, when the conductive part 22 is led out from the side of the active material coating part 21 close to the pole 12, the space occupied by the conductive part 22 between the active material coating part 21 and the pole 12 can be saved, the size of the active material coating part 21 in the direction of leading out the conductive part 22 can be increased, the distance between the active material coating part 21 and the pole 12 can be reduced, and the energy density of the battery cell 10 can be improved.

[0166] At the same time, by accommodating at least part of the conductive part 22 in the accommodating part 121, the space occupied by the battery cell 10 itself can be reduced, so that the battery 100 of the same volume can accommodate a larger number of battery cells 10, and the volume energy density of the battery 100 can be improved; in addition, accommodating at least part of the conductive part 22 in the accommodating part 121 to occupy the space in the pole 12 can reduce the redundancy of the conductive part 22 in the shell 11 to at least a certain extent, reduce the probability of short circuit between the conductive part 22 and the active material coating part 21, reduce the probability of short circuit of the battery cell 10, and improve the working reliability and stability of the battery cell 10 and the battery 100.

[0167] It should be noted that, in the embodiment of the present application, the accommodation portion 121 may be located on the side of the pole 12 facing the active material coating portion 21 or on the side of the pole 12 away from the active material coating portion 21 .

[0168] For example, please refer again to Fig.17 and Fig.18 When the accommodating portion 121 is located on the side of the pole 12 facing the active material coating portion 21, the accommodating portion 121 includes a first accommodating groove 12110, and the surface of the pole 12 facing the active material coating portion 21 is the pole inner end face 122, and the notch of the first accommodating groove 12110 is formed on the pole inner end face 122, and at least a portion of the conductive portion 22 is accommodated in the first accommodating groove 12110.

[0169] Exemplarily, the first receiving groove 12110 is a groove body, and the groove body is a groove-shaped structure with a certain depth. For example, when the pole 12 is arranged on the upper end wall of the housing 11, and the inner end face 122 of the pole is the lower surface of the pole 12, the first receiving groove 12110 is formed as a receiving groove with a groove opening downward and a groove wall concave upward. For another example, when the pole 12 is arranged on the lower end wall of the housing 11, and the inner end face 122 of the pole is the upper surface of the pole 12, the first receiving groove 12110 is formed as a receiving groove with a groove opening upward and a groove wall concave downward.

[0170] In the above technical solution, on the one hand, the first receiving groove 12110 is provided on the pole 12 to reduce the weight of the pole 12 to a certain extent, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, since the notch of the first receiving groove 12110 is formed on the inner end surface 122 of the pole, and the inner end surface 122 of the pole is the surface of the pole 12 close to the active material coating part 21, the first receiving groove 12110 can be opened toward the active material coating part 21, thereby facilitating the conductive part 22 to extend into the first receiving groove 12110, thereby improving assembly efficiency. Moreover, this type of first receiving groove 12110 is easy to process, thereby improving production efficiency.

[0171] Furthermore, the first receiving groove 12110 can be easily processed to have a larger volume, so as to accommodate more conductive parts 22. At the same time, since the first receiving groove 12110 is open toward the active material coating part 21, the first receiving groove 12110 can also be used as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the battery cell 10 consumes electrolyte during the charging and discharging process, when there is more electrolyte, the service life of the battery cell 10 can be extended. Also, because the first receiving groove 12110 is open toward the active material coating part 21, the first receiving groove 12110 can also be used as a receiving and buffer structure for gas production inside the electrode assembly 2, thereby reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0172] In addition, since the first receiving groove 12110 is located on the inner side of the pole 12, external foreign matter and impurities are not easy to enter the first receiving groove 12110, which can reduce the impact of external foreign matter and impurities on the electrode assembly 2, improve the working stability and reliability of the electrode assembly 2, and further improve the stability and reliability of the battery cell 10 and the battery 100.

[0173] Please refer again Fig.17In the embodiment of the present application, the connection method between the pole 12 and the housing 11 is not limited, for example, it can be welding or riveting. For example, when the two are matched by riveting, the housing 11 has a through hole 113, and the pole 12 is riveted and installed at the through hole 113. Of course, it is understandable that when the two are matched by welding or other methods, the housing 11 can also be provided with a through hole 113 to facilitate the pole 12 to be installed in the housing 11 through the through hole 113, which is not limited here.

[0174] At the same time, the first receiving groove 12110 can be arranged corresponding to the position of the through hole 113, or in other words, on the projection plane perpendicular to the axial direction R of the pole 12, the orthographic projection of the first receiving groove 12110 is located within the orthographic projection range of the through hole 113, so that the first receiving groove 12110 can have a greater depth to accommodate more conductive parts 22, thereby further reducing the space occupied by the conductive parts 22 in the housing 11. Specifically, when the housing 11 is provided with a through hole 113 and the pole 12 is installed in the through hole 113, along the axial direction R of the pole 12, the depth H1 of the first receiving groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the pole to the through hole 113.

[0175] It should be noted that the specific shape of the first receiving groove 12110 is not limited, and can be a regular shape or an irregular shape, such as a cylindrical groove with a rectangular, elliptical, or racetrack cross section, or a trapezoidal groove with a rectangular cross section and a gradually changing cross section size, or a hemispherical groove with a circular cross section and a gradually changing cross section size, or a hemispherical groove with an elliptical cross section and a gradually changing cross section size, etc. Therefore, the depth H1 of the first receiving groove 12110 refers to: the maximum depth of the first receiving groove 12110 along the axial direction R of the pole 12.

[0176] Since in the axial direction R of the pole 12, the depth H1 of the first receiving groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the pole to the through hole 113, the volume of the pole 12 can be fully utilized, so that the first receiving groove 12110 has a larger depth, which is conducive to accommodating more conductive parts 22, thereby further reducing the space occupied by the conductive parts 22 in the shell 11 to a greater extent, further improving the energy density of the battery cell 10, and further reducing the redundancy of the conductive parts 22 in the shell 11; at the same time, since the first receiving groove 12110 has a larger depth, it can also accommodate the gas production of the electrode assembly 2, improve the reliability and stability of the battery cell 10, and can also accommodate more electrolyte to increase the service life of the battery cell 10.

[0177] Please refer again Fig.17 and Fig.18In order to improve the stability and reliability of the electrical connection between the active material coating portion 21 and the pole 12, in some embodiments of the present application, the electrical connection position between the conductive portion 22 and the pole 12 can be located on the groove wall of the first accommodating groove 12110 formed by the accommodating portion 121.

[0178] Exemplarily, the conductive part 22 and the pole 12 can be electrically connected by welding, and the electrical connection position is the welding position of the conductive part 22 and the pole 12. At the same time, the welding method of the conductive part 22 and the pole 12 is not limited, for example, it can be laser welding, and according to factors such as the position, angle, or structure of the welding part, vertical welding, inclined welding, lap welding, edge sealing welding, etc. can be selected. In other embodiments of the present application, the conductive part 22 and the pole 12 can also be electrically connected by other methods instead of welding, such as by providing conductive glue or conductive nails. To simplify the description, the following text takes the case where the conductive part 22 and the pole 12 are welded to form an electrical connection, and the welding position is the electrical connection position of the conductive part 22 and the pole 12 as an example for introduction.

[0179] Specifically, the pole 12 specifically includes a first end wall 12111 and a first side wall 12113, the first end wall 12111 is located on a side of the first side wall 12113 away from the active material coating portion 21, the first end wall 12111 and the first side wall 12113 are surrounded to form a first receiving groove 12110, and the electrical connection position of the conductive portion 22 and the pole 12 is located at 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.

[0180] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the pole 12 on at least one of the first end wall 12111 and the first side wall 12113, the first receiving groove 12110 not only has the function of accommodating at least part of the conductive part 22, but also the groove wall of the first receiving groove 12110 has the function of realizing electrical connection with the conductive part 22, which can simplify the structure of the pole 12, facilitate the processing of the pole 12, and simplify the structure of the conductive part 22, reduce the redundancy of the conductive part 22, and reduce the cost of the conductive part 22. Moreover, by using the groove wall of the first receiving groove 12110 to realize the electrical connection with the conductive part 22, the area where the conductive part 22 is electrically connected to the pole 12 can be set relatively large, which can not only reduce the difficulty of electrical connection, but also improve the reliability and stability of electrical connection, thereby improving the performance of the battery cell 10.

[0181] In addition, since the electrical connection position between the conductive part 22 and the pole 12 is located in the first receiving groove 12110, it can not only prevent the electrical connection position from protruding from the outside of the pole 12 and occupying the space outside the pole 12, but also enable the electrical connection position to be protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole 12.

[0182] In addition, in an embodiment of the present application, the first end wall 12111 is constructed as a closed structure without a through hole 12130, so that the first receiving tank 12110 is isolated from the external space of the shell 11, which can reduce the problem of electrolyte in the shell 11 leaking from the first receiving tank 12110.

[0183] Please refer again Fig.17 and Fig.18 In some optional embodiments, the partial shape of the conductive part 22 matches the partial shape of the first end wall 12111, and they are arranged in a close fit and electrically connected, so that the position where the conductive part 22 is electrically connected to 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 a plane, a part of the conductive part 22 can also be a plane and fit to the first end wall 12111, and the fit position is electrically connected, such as 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.

[0184] In addition, when the electrical connection between the conductive part 22 and the first end wall 12111 is welding, since the first end wall 12111 is located on the side of the first receiving groove 12110 away from the active material coating part 21, it is convenient to perform welding operations. For example, welding can be performed from the side of the pole 12 away from the active material coating part 21.

[0185] It is worth noting that the shape of the first end wall 12111 is not limited, for example, it can be a flat plate, an arc plate, etc. Among them, when the first end wall 12111 is a flat plate structure, the first end wall 12111 is arranged at an angle with the axial direction R of the pole 12, for example, it can be a flat plate structure perpendicular to the axial direction R of the pole 12, and for example, it can also be an inclined plate structure that is not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0186] Of course, in other embodiments of the present application, the position where the conductive part 22 is electrically connected to the first end wall 12111 may not extend along the length or width direction of the first end wall 12111, for example, it may be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart portions that are respectively welded to the first end wall 12111, which will not be elaborated here.

[0187] Please refer to Fig.19 , Fig.19A partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. When the conductive portion 22 is electrically connected to the first end wall 12111, a first sinking groove 12112 may be provided on the first end wall 12111, and the sinking direction of the first sinking groove 12112 is the direction away from the active material coating portion 21. At least part of the electrically connected position between the conductive portion 22 and the first end wall 12111 is located in the first sinking groove 12112. Exemplarily, at least part of the conductive portion 22 may be provided in the first sinking groove 12112 and connected to the portion of the first end wall 12111 used to define the first sinking groove 12112.

[0188] In the above technical scheme, on the one hand, the first sink groove 12112 can be used to realize pre-positioning and limiting of the electrical connection position of the conductive part 22, which is not only conducive to finding the correct position to realize electrical connection and improve production efficiency, but also conducive to improving the stability and reliability of the conductive part 22, and improving the stability and reliability of the battery cell 10 during the charging and discharging process; on the other hand, by arranging the first sink groove 12112 on the first end wall 12111, the local wall thickness of the first end wall 12111 can be locally thinned, which is not only conducive to welding, but also conducive to reducing the weight of the pole 12 and improving the weight energy density of the battery cell 10.

[0189] Please refer again Fig.18 and Fig.19 In the embodiment of the present application, the pole 12 can also be provided with a first groove 126 as required, and the first groove 126 is located on the side of the pole 12 away from the active material coating portion 21, that is, the surface of the side of the pole 12 away from the active material coating portion 21 is the pole outer end face 123, and the notch of the first groove 126 is formed on the pole outer end face 123.

[0190] It can be understood that the first groove 126 is a groove body, and the groove body is a groove-shaped structure with a certain depth. In addition, when the pole 12 is arranged on the upper end wall of the shell 11, and the pole outer end face 123 is the upper surface of the pole 12, the first groove 126 is formed as a first groove 126 with a notch opening upward and a groove wall concave downward (that is, a square concave toward the electrode assembly 2). For another example, when the pole 12 is arranged on the lower end wall of the shell 11, and the pole outer end face 123 is the lower surface of the pole 12, the first groove 126 is formed as a first groove 126 with a notch opening downward and a groove wall concave upward (that is, a square concave away from the electrode assembly 2).

[0191] In the above technical solution, on the one hand, since the pole 12 is provided with the first groove 126, the weight of the pole 12 can be further reduced, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, the first groove 126 is located on the outer side of the pole 12, that is, it is open to the side of the pole 12 away from the inside of the shell 11, and the first groove 126 can be used to accommodate or install structural components of the battery 100 that electrically connect the various battery cells 10, so as to make full use of the space inside the pole 12 and improve the space utilization and volume energy density of the battery 100.

[0192] In addition, since the pole 12 has both the first receiving groove 12110 and the first groove 126, the first groove 126 is located on the side of the first receiving groove 12110 away from the active material coating portion 21, and the first groove 126 is open in the direction away from the first receiving groove 12110, which is convenient for laser welding the conductive portion 22 and the first end wall 12111 from the outside of the pole 12, that is, the side of the pole 12 away from the active material coating portion 21, through the first groove 126, and it is convenient to realize the electrical connection between the conductive portion 22 and the pole 12 through external welding. In other words, through the above-mentioned structural setting, it is convenient to perform external welding on the pole 12 and the conductive portion 22 through the first groove 126, which is convenient for processing and manufacturing of the battery cell 10, and can save processing and manufacturing costs.

[0193] Furthermore, in order to conveniently and effectively weld the conductive portion 22 to the groove wall of the first receiving groove 12110 through the first groove 126 and improve the welding reliability of the conductive portion 22 to the groove wall of the first receiving groove 12110, in the embodiment of the present application, the portion between the first groove 126 and the first receiving groove 12110 can be laser welded to the conductive portion 22, that is, Fig.19 The spacer 127 shown is laser welded with the conductive part 22 to achieve electrical connection between the electrode assembly 2 and the pole 12. The thickness of the spacer 127 located between the first groove 126 and the first receiving groove 12110 of the pole 12 is relatively thin, and the spacer 127 isolates the first groove 126 and the first receiving groove 12110. The side wall of the spacer 127 close to the active material coating part 21 can be used as the first end wall 12111. When the conductive part 22 needs to be welded with the first end wall 12111, since the thickness of the spacer 127 is relatively thin, it is convenient to realize the welding of the conductive part 22 and the first end wall 12111 through the first groove 126, thereby improving the convenience and reliability of welding.

[0194] Please refer again Fig.18Furthermore, the battery cell 10 may also include a slot cover 7, which is provided on the pole 12 and covers the notch of the first groove 126. In the above technical solution, by providing the slot cover 7 that covers the first groove 126, the pole 12 can be indirectly electrically connected to the current collector through the slot cover 7, and the position and structure of the slot cover 7 can be set to make the electrical connection between the slot cover 7 and the current collector more convenient and the electrical connection area larger. Therefore, by providing the slot cover 7, the electrical connection between adjacent battery cells 10 in the battery 100 can be facilitated, and since the position where the battery cells 10 are electrically connected to the battery cells 10 is located at the slot cover 7, the electrical connection position between the conductive part 22 and the pole 12 can be separated by the first groove 126, and there is less interference between the two, which can further improve the stability and reliability of the battery cell 10.

[0195] For example, please refer to Fig. 20 , Fig. 20 A partial cross-sectional schematic diagram of a battery cell 10 provided for some embodiments of the present application, wherein the accommodating portion 121 may also be configured to include a second accommodating groove 12120, the surface of the pole 12 away from the active material coating portion 21 is the pole outer end face 123, the notch of the second accommodating groove 12120 is formed on the pole outer end face 123, the second accommodating groove 12120 is connected to the interior of the shell 11 through the through hole 12130, the conductive portion 22 is penetrated through the through hole 12130 and is at least partially accommodated in the second accommodating groove 12120.

[0196] It can be understood that the second receiving groove 12120 is a groove body, and the groove body is a groove-shaped structure with a certain depth. For example, when the pole 12 is arranged on the upper end wall of the housing 11, and the pole outer end surface 123 is the upper surface of the pole 12, the second receiving groove 12120 is formed as a receiving groove with a groove opening upward and a groove wall concave downward. For another example, when the pole 12 is arranged on the lower end wall of the housing 11, and the pole outer end surface 123 is the lower surface of the pole 12, the second receiving groove 12120 is formed as a receiving groove with a groove opening downward and a groove wall concave upward.

[0197] In the above technical solution, please refer to Fig. 20On the one hand, the pole 12 is provided with a second receiving groove 12120, which can reduce the weight of the pole 12 to a certain extent, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, since the notch of the second receiving groove 12120 is formed on the outer end surface 123 of the pole, and the outer end surface 123 of the pole is the surface of the pole 12 away from the active material coating part 21, the second receiving groove 12120 can be open in the direction away from the active material coating part 21. In this way, when at least part of the conductive part 22 is accommodated in the second receiving groove 12120, the conductive part 22 can be easily stored and sorted through the notch of the second receiving groove 12120, and the conductive part 22 can be easily electrically connected to the pole 12 through the notch of the second receiving groove 12120, etc., thereby reducing the production difficulty of the battery cell 10 and improving the production efficiency of the battery cell 10.

[0198] At the same time, because the second receiving groove 12120 can be connected with the interior of the shell 11 through the perforation 12130, the second receiving groove 12120 can also be used as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the electrolyte will be consumed during the charging and discharging process of the battery cell 10, when there is more electrolyte, the service life of the battery cell 10 can be extended; and because the second receiving groove 12120 can be connected with the interior of the shell 11 through the perforation 12130, the second receiving groove 12120 can also be used as a receiving and buffer structure for gas production inside the electrode assembly 2, thereby reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0199] It is worth noting that when the accommodating portion 121 has a second accommodating groove 12120, and the conductive portion 22 is provided in the through hole 12130 and is at least partially accommodated in the second accommodating groove 12120, the electrical connection position of the conductive portion 22 and the pole 12 is not limited. Exemplarily, when the conductive portion 22 is provided in the through hole 12130 and is at least partially accommodated in the second accommodating groove 12120, in an embodiment of the present application, the electrical connection position of the conductive portion 22 and the pole 12 is located at the hole wall of the through hole 12130 formed by the pole 12.

[0200] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the pole 12 on the hole wall of the through hole 12130, it is convenient to perform electrical connection operation on the conductive part 22 and the pole 12 through the second accommodating groove 12120, and when the electrical connection area between the conductive part 22 and the pole 12 is large, the electrical connection between the conductive part 22 and the pole 12 can be used to achieve the sealing of the through hole 12130, so as to save sealing costs, reduce electrolyte leakage, and save sealing parts.

[0201] Specifically, the conductive part 22 can be welded to the hole wall of the perforation 12130 at the position where the perforation 12130 is connected to the second accommodating groove 12120, which is convenient for operation. In addition, the welding mark can be controlled to seal the perforation 12130 using the welding mark and the conductive part 22, so as to improve the problem of electrolyte in the shell 11 leaking from the perforation 12130.

[0202] As another example, when the conductive portion 22 is passed through the through hole 12130 and at least partially contained in the second containing groove 12120, in some other embodiments of the present application, the electrical connection position between the conductive portion 22 and the pole 12 may also be located on the groove wall of the second containing groove 12120 formed by the pole 12. Thus, the electrical connection operation is facilitated. For example, when the conductive portion 22 is welded to the groove wall of the second containing groove 12120 formed by the pole 12, the conductive particles generated by the welding may enter the housing 11, causing a short circuit and other problems.

[0203] Please refer again Fig. 20 The pole 12 includes a second end wall 12121 and a second side wall 12123. The second end wall 12121 is located on a side of the second side wall 12123 close to the active material coating portion 21. The second end wall 12121 and the second side wall 12123 are arranged to form a second accommodating groove 12120. The through hole 12130 is opened on the second end wall 12121. The electrical connection position between the conductive portion 22 and the pole 12 is located on the second end wall 12121 and / or on the second side wall 12123.

[0204] More specifically, the conductive portion 22 and the pole 12 can be electrically connected by welding, so the welding position is the electrical connection position of the conductive portion 22 and the pole 12. In other embodiments of the present application, the conductive portion 22 and the pole 12 can also be electrically connected by other methods instead of welding, such as by providing conductive glue or conductive nails, which will not be described in detail here.

[0205] To simplify the description, the following description takes the case where the conductive portion 22 is welded to the pole 12 to form an electrical connection, and the welding position is the electrical connection position between the conductive portion 22 and the pole 12. For example, in some embodiments, the electrical connection position between the conductive portion 22 and the pole 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.

[0206] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the pole 12 on at least one of the second end wall 12121 and the second side wall 12123, the second receiving groove 12120 not only has the function of accommodating at least part of the conductive part 22, but also the groove wall of the second receiving groove 12120 has the function of realizing electrical connection with the conductive part 22, which can simplify the structure of the pole 12 and facilitate the processing of the pole 12. In addition, since the through hole 12130 is provided in the second end wall 12121, it is convenient for the conductive part 22 to extend into the second receiving groove 12120 through the through hole 12130, which can simplify the structure of the conductive part 22, reduce the redundancy of the conductive part 22, and reduce the cost of the conductive part 22. Furthermore, the opening direction of the slot of the second receiving slot 12120 makes it easy to electrically connect the conductive part 22 with the slot wall of the second receiving slot 12120 through the slot of the second receiving slot 12120, thereby reducing the difficulty of electrical connection. Furthermore, by utilizing the slot wall of the second receiving slot 12120 to achieve electrical connection with the conductive part 22, the area where the conductive part 22 is electrically connected to the pole 12 can be relatively large, thereby improving the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0207] In addition, since the electrical connection position between the conductive part 22 and the pole 12 is located in the second receiving groove 12120, it can not only avoid the electrical connection position protruding from the outside of the pole 12 and occupying the space outside the pole 12, but also enable the electrical connection position to be protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole 12.

[0208] Please refer again Fig. 20 In some embodiments, the partial shape of the conductive part 22 matches the partial shape of the second end wall 12121, and they are arranged in a close fit and electrically connected, so that the position where the conductive part 22 is electrically connected to 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 a plane, a part of the conductive part 22 can also be a plane and fit to the second end wall 12121, and the fit position is electrically connected, such as 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.

[0209] It is worth noting that the shape of the second end wall 12121 is not limited, for example, it can be a flat plate or an arc plate structure. When the second end wall 12121 is a flat plate structure, the second end wall 12121 is arranged at an angle with the axial direction R of the pole 12, for example, it can be a flat plate structure perpendicular to the axial direction R of the pole 12, or it can also be an inclined flat plate structure that is not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0210] For example, please refer again to Fig. 20When the second end wall 12121 is in a flat plate structure, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 is equal to 90°, that is, along the direction from the through hole 12130 to the second side wall 12123, the second end wall 12121 is equidistant from the active material coating portion 21. This facilitates welding of the conductive portion 22 and the second end wall 12121.

[0211] For another example, the angle θ between the second end wall 12121 and the axial direction R of the pole 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 obliquely toward the direction close to the active material coating portion 21. As a result, the extension distance of the conductive portion 22 along the second end wall 12121 can be increased to increase the reliability of the electrical connection. Exemplarily, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 can be 90°-145°, such as 100°, 110°, 120°, 130°, 140°, etc., which can make the second end wall 12121 easy to process and convenient for electrical connection with the conductive portion 22, and can more fully utilize the space in the pole 12 to accommodate the conductive portion 22.

[0212] For another example, the angle θ between the second end wall 12121 and the axial direction R of the pole 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 extends obliquely away from the active material coating portion 21 .

[0213] Thus, the extension distance of the conductive part 22 along the second end wall 12121 can be increased to increase the reliability of the electrical connection. Exemplarily, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 can be 45°-90°, such as 50°, 60°, 70°, 80°, etc., which can make the second end wall 12121 easy to process and convenient for electrical connection with the conductive part 22, and can make full use of the space in the pole 12 to accommodate the conductive part 22.

[0214] Of course, the present application is not limited to this. In other embodiments of the present application, the position where the conductive part 22 is electrically connected to the second end wall 12121 may not extend along the length or width direction of the second end wall 12121, and it may also be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart portions that are respectively welded to the second end wall 12121, which will not be elaborated here.

[0215] Please refer again Fig. 20 , and further refer to Fig.21 , Fig.21A partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. Regardless of the specific value of the angle θ between the second end wall 12121 and the axial direction R of the pole 12, in the embodiments of the present application, when the conductive portion 22 is electrically connected to the second end wall 12121, a second sinking groove 12122 can be provided on the second end wall 12121 as required, and the second sinking groove 12122 is a groove formed by a part of the second end wall 12121 sinking toward one end close to the active material coating portion 21. The position where the conductive portion 22 is electrically connected to the second end wall 12121 is at least partially located in the second sinking groove 12122.

[0216] In the above technical solution, the portion of the conductive part 22 located in the second groove 12122 is set to match the shape of the second groove 12122, and is fitted to achieve electrical connection. The second groove 12122 can be used to pre-position and limit the electrical connection position of the conductive part 22, which is beneficial to accurately find the position to achieve electrical connection, improve production efficiency, and improve the stability and reliability of the electrical connection position, so as to improve the reliability and stability of the charging and discharging operations of the battery cell 10.

[0217] Please refer again Fig.21 In the embodiment of the present application, the connection method between the pole 12 and the housing 11 is not limited, for example, it can be welding or riveting. For example, when the two are matched by riveting, the housing 11 has a through hole 113, and the pole 12 is riveted and installed at the through hole 113. Of course, it can be understood that when the two are matched by welding or other methods, the housing 11 can also be provided with a through hole 113, and the pole 12 is installed at the through hole 113.

[0218] Optionally, please refer again to Fig. 20 The second accommodating groove 12120 can be set corresponding to the position of the through hole 113, or in other words, on the projection plane perpendicular to the axial direction R of the pole 12, the orthographic projection of the second accommodating groove 12120 is located within the orthographic projection range of the through hole 113, so that the second accommodating groove 12120 can have a larger depth to accommodate more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 in the shell 11 to a greater extent.

[0219] In some embodiments, please refer again to Fig. 20 When the housing 11 has a through hole 113 and the pole 12 is installed in the through hole 113, along the axial direction R of the pole 12, the depth H3 of the second accommodating groove 12120 is greater than or equal to the minimum distance H4 from the outer end surface 123 of the pole to the through hole 113.

[0220] It should be noted that the specific shape of the second receiving groove 12120 is not limited, and can be a regular shape or an irregular shape, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross section, or a trapezoidal groove with a rectangular cross section and a gradually changing cross-sectional size, or a hemispherical groove with a circular cross section and a gradually changing cross-sectional size, or a hemispherical groove with an elliptical cross section and a gradually changing cross-sectional size, etc. It is worth noting that the racetrack shape described herein refers to a shape in which the two short sides of a rectangle are replaced by convex curves.

[0221] Therefore, the depth H3 of the second receiving groove 12120 refers to: the maximum depth of the second receiving groove 12120 along the axial direction R of the pole 12. Since the depth H3 of the second receiving groove 12120 is greater than or equal to the minimum distance H4 from the outer end surface 123 of the pole to the through hole 113 in the axial direction R of the pole 12, the volume of the pole 12 can be fully utilized, so that the second receiving groove 12120 has a larger depth, which is conducive to accommodating more conductive parts 22, thereby further reducing the space occupied by the conductive parts 22 in the shell 11, further improving the energy density of the battery cell 10, and further reducing the redundancy of the conductive parts 22 in the shell 11; at the same time, since the second receiving groove 12120 has a larger depth, it can also accommodate the gas production of the electrode assembly 2, improve the reliability and stability of the battery cell 10, and can also accommodate more electrolyte to increase the service life of the battery cell 10.

[0222] Please refer to Fig.21 , and further refer to Fig. 22 , Fig. 22 A partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. In the embodiments of the present application, when the receiving portion 121 has the second receiving groove 12120 of any of the above embodiments, optionally, the battery cell 10 may further include a cover plate 13, the cover plate 13 cooperates with the pole 12 and closes the notch of the second receiving groove 12120, and the cover plate 13 is electrically connected to the pole 12.

[0223] In the above technical solution, by setting the cover plate 13 to close the notch of the second receiving groove 12120, the leakage of the electrolyte in the shell 11 from the notch of the second receiving groove 12120 can be reduced, and because the cover plate 13 closes the notch of the second receiving groove 12120 and is electrically connected to the pole 12, the cover plate 13 can be used to easily realize the indirect electrical connection between the pole 12 and the busbar component, and it is beneficial to increase the connection area of ​​the electrical connection, thereby helping to reduce the resistance of the electrical connection.

[0224] It is worth noting that the matching mode and matching position of the cover plate 13 and the pole 12 are not limited, as long as the cover plate 13 can close the notch of the second receiving groove 12120. For example, in some embodiments, the cover plate 13 can be welded to the pole 12. During processing, the conductive portion 22 can first pass through the through hole 12130 and be welded to the groove wall of the second receiving groove 12120, and then the cover plate 13 and the pole 12 are welded to close the notch of the second receiving groove 12120.

[0225] It should also be noted that the specific structure of the cover plate 13 is not limited. For example, in some optional embodiments, please refer to Fig. 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 cooperates with and is electrically connected to the pole 12 , and the second conductive member 132 cooperates with and is electrically connected to the first conductive member 131 .

[0226] In the above technical solution, the cover plate 13 is set to a composite form, and the first conductive member 131 is set to be the same material as the pole 12, so as to facilitate the electrical connection between the first conductive member 131 and the pole 12, for example, the first conductive member 131 can be easily connected to the pole 12 reliably and stably by welding. And because the second conductive member 132 is made of a different material from the first conductive member 131, it is convenient to use the second conductive member 132 to electrically connect with a busbar component whose material is different from that of the pole 12, for example, the second conductive member 132 can be easily connected to a busbar component whose material is the same as that of the second conductive member 132 reliably and stably by welding.

[0227] For example, when the pole 12 is a negative pole 12, the pole 12 is a copper pole, and the current collecting component is an aluminum sheet, at this time, the first conductive member 131 can be set to copper material, and the second conductive member 132 can be set to aluminum material. At this time, the pole 12 and the first conductive member 131 are made of the same material and can be effectively welded, and the second conductive member 132 and the current collecting component are made of the same material and can be effectively welded, so that the pole 12 can be effectively connected to the current collecting component indirectly through the cover plate 13. Moreover, the welding of the pole 12 and the first conductive member 131 is copper material and copper material, which has good fluidity and is not easy to crack, which is conducive to improving the sealing effect of the welding point.

[0228] Please refer again Fig. 22In some optional examples, the first conductive member 131 is located between the second containing groove 12120 and the second conductive member 132. In the above technical solution, since the first conductive member 131 is located between the second containing groove 12120 and the second conductive member 132, the second containing groove 12120 and the second conductive member 132 can be separated, so that when the electrolyte in the housing 11 enters the second containing groove 12120 from the through hole 12130, the first conductive member 131 can be used to reduce the contact between the electrolyte and the second conductive member 132, thereby solving the problem of corrosion of the second conductive member 132 by the electrolyte.

[0229] It is worth noting that the matching method of the first conductive member 131 and the second conductive member 132 is not limited. Fig. 22 The first conductive member 131 has a second groove 1311, and the second conductive member 132 is embedded in the second groove 1311. The notch of the second groove 1311 is formed on the surface of the first conductive member 131 away from the second receiving groove 12120, so that the second conductive member 132 is exposed from the notch of the second groove 1311. Alternatively, in other embodiments, the connection method between the first conductive member 131 and the second conductive member 132 can also be fastening connection, clamping, etc.

[0230] It should also be noted that the “exposed” of the second conductive member 132 being exposed from the notch of the second groove 1311 means that the first conductive member 131 does not block the second conductive member 132 at the notch position of the second groove 1311, and the second conductive member 132 is not required to protrude from the notch of the second groove 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 accommodating groove 12120, or the second conductive member 132 may protrude from the surface of the first conductive member 131 on the side away from the second accommodating groove 12120.

[0231] In the above technical solution, on the one hand, by embedding the second conductive member 132 in 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 convenience of the cooperation between 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, and the space occupied by the cover plate 13 can be reduced to improve the space utilization of the battery cell 10. On the other hand. In addition, since the second conductive member 132 can be exposed from the surface of the first conductive member 131 away from the second receiving groove 12120 through the notch of the second groove 1311, it is conducive to realizing the electrical connection between the second conductive member 132 and the current collecting component outside the pole 12.

[0232] In addition, since the notch of the second groove 1311 is formed on the surface of the first conductive member 131 on the side away from the second receiving groove 12120, it means that the second groove 1311 is open in the direction away from the active material coating portion 21, so that the portion of the groove wall of the first conductive member 131 used to define the second groove 1311 is located between the second receiving groove 12120 and the second conductive member 132 to separate the second receiving groove 12120 from the second conductive member 132, thereby preventing the electrolyte entering the second groove 1311 from contacting the second conductive member 132 and reducing leakage of the electrolyte.

[0233] Of course, in other embodiments, the cover plate 13 may not be a composite form composed of multiple materials. For example, in other embodiments of the present application, the cover plate 13 as a whole may be set to a non-composite form made of the same material, such as for adapting to the positive electrode column 12, which will not be elaborated here.

[0234] Please refer again Fig. 22 , the cover plate 13 is also embedded in the notch of the second receiving groove 12120. In the above technical solution, by embedding the cover plate 13 in the second receiving groove 12120, the difficulty of assembling the cover plate 13 and the pole 12 can be reduced, the assembly stability of the cover plate 13 and the pole 12, as well as the reliability and convenience of the connection can be improved, and the space occupied by the cover plate 13 outside the pole 12 can be reduced. Moreover, since the cover plate 13 is embedded in the notch of the second receiving groove 12120, there can be sufficient space in the second receiving groove 12120 to accommodate the conductive part 22.

[0235] Of course, in other embodiments of the present application, the cooperation between the cover plate 13 and the pole 12 is not limited to being embedded in the second receiving groove 12120. The cover plate 13 can also be directly covered on the outside of the pole 12, that is, directly covered at the notch of the second receiving groove 12120, so as to facilitate the cooperation with the convergence component of the battery 100, which is not limited in this embodiment.

[0236] According to some embodiments of the present application, the present application further provides a battery 100, comprising the battery cell 10 of the above solution.

[0237] In the technical solution of the embodiment of the present application, by setting the air guide groove 81 on the installation wall 114, the air guide groove 81 can guide the air in the shell 11 to flow to the explosion-proof valve 6, which is convenient for improving the exhaust efficiency of the battery cell 10 and realizing the rapid pressure relief of the battery cell 10. Compared with setting a separate air guide component inside the battery cell 10, the air guide groove 81 is opened on the installation wall 114 to form the air guide part 80, which is convenient for reducing the space occupied by the air guide part 80 in the battery cell 10.

[0238] According to some embodiments of the present application, the present application further provides an electric device, including the battery 100 of the above solution, and the battery 100 is used to provide electric energy for the electric device. The electric device can be any of the above-mentioned devices or systems using the battery.

[0239] In the technical solution of the embodiment of the present application, by setting the air guide groove 81 on the installation wall 114, the air guide groove 81 can guide the air in the shell 11 to flow to the explosion-proof valve 6, which is convenient for improving the exhaust efficiency of the battery cell 10 and realizing the rapid pressure relief of the battery cell 10. Compared with setting a separate air guide component inside the battery cell 10, the air guide groove 81 is opened on the installation wall 114 to form the air guide part 80, which is convenient for reducing the space occupied by the air guide part 80 in the battery cell 10.

[0240] According to some embodiments of the present application, a battery cell 10 is provided. The battery cell 10 includes a shell 11 , an electrode assembly 2 , an explosion-proof valve 6 and an air guide 80 . The electrode assembly 2 is disposed in the shell 11 .

[0241] The shell 11 includes a shell body 111 and a shell cover 112. The shell body 111 has an opening 1110. The shell cover 112 covers the opening 1110 to form an internal environment of the battery cell 10. The electrode assembly 2 is arranged in the internal environment. The shell cover 112 forms a mounting wall 114. The explosion-proof valve 6 includes a pressure relief groove 60, which is opened on the mounting wall 114. The air guide portion 80 includes an air guide groove 81, which is opened on the mounting wall 114. The air guide groove 81 is used to guide the gas generated by the electrode assembly 2 to the pressure relief groove 60.

[0242] By laser cutting or CNC punching the mounting wall 114, the pressure relief groove 60 and the air guide 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 air guide groove 81 is provided on the mounting wall 114, the wall portion of the mounting wall 114 opposite to the air guide groove 81 in the Z direction is the first wall portion 1143. After the pressure relief groove 60 is provided on the mounting wall 114, the wall portion of the mounting wall 114 opposite to the pressure relief 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.

[0243] The depth H1 of the air guide groove 81 is smaller than the depth H2 of the pressure relief groove 60, so as to control the thickness of the first wall portion 1143 to be greater than the thickness of the second wall portion 1144, thereby making the structural strength of the first wall portion 1143 greater than the structural strength of the second wall portion 1144. In this way, when the air pressure in the battery cell 10 reaches a critical value, the gas will first break through the second wall portion 1144, that is, will first destroy the explosion-proof valve 6.

[0244] In some embodiments, the air guide groove 81 and the pressure relief groove 60 are both arranged on the side of the installation wall 114 facing the inner cavity of the shell 11. In other embodiments, the air guide groove 81 is arranged on the side of the installation wall 114 facing the inner cavity of the shell 11, and the pressure relief groove 60 is arranged on the side of the installation wall 114 facing away from the inner cavity of the shell 11.

[0245] Among them, the pressure relief groove 60 includes a first pressure relief groove section 61 and a second pressure relief groove section 62 arranged crosswise, the first pressure relief groove section 61 extends along the length direction of the mounting wall 114, and the second pressure relief groove section 62 extends along the width direction of the mounting wall 114, and the first pressure relief groove section 61 and the second pressure relief groove section 62 are connected. This arrangement is convenient for increasing the area of ​​the first pressure relief groove section 61 and the second pressure relief groove section 62, thereby increasing the area of ​​the explosion-proof valve 6, so that the gas can be evenly distributed in the first pressure relief groove section 61 and the second pressure relief groove section 62. When the air pressure in the battery cell 10 reaches a critical value, the gas is convenient for forming a larger opening 1110 when breaking through the explosion-proof valve 6, thereby facilitating the rapid pressure relief of the battery cell 10.

[0246] The air guide groove 81 includes a first air guide groove section 811 and a second air guide groove section 812. The first air guide groove section 811 extends along the length direction of the installation wall 114, and the second air guide groove section 812 extends along the width direction of the installation wall 114. The first air guide groove section 811 and the second air guide groove section 812 are connected. This arrangement facilitates increasing the volume of the air guide groove 81, so that the air guide groove 81 can accommodate more gas, thereby facilitating improving the flow guidance efficiency of the air guide groove 81, wherein the gas in the second air guide groove 81 can enter the first air guide groove 81 and flow along the first air guide groove 81 to the explosion-proof valve 6.

[0247] Among them, the air guide parts 80 include two, and the explosion-proof valve 6 is located between the two air guide parts 80. The explosion-proof valve 6 can be located at the center position of the installation wall 114, or can be set offset from the center position of the installation wall 114. The specific position can be determined according to actual needs and is not limited here.

[0248] When the explosion-proof valve 6 is disposed at a center position of the installation wall 114 , the area of ​​the air guide portion 80 on one side of the explosion-proof valve 6 is larger, and the area of ​​the air guide portion 80 on the other side of the explosion-proof valve 6 is smaller.

[0249] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing including a mounting wall; An electrode assembly is disposed in the housing; An explosion-proof valve, arranged on the installation wall; The gas guide portion includes a gas guide groove opened on the installation wall, and the gas guide groove is used to guide the gas generated by the electrode assembly to the explosion-proof valve.

2. The battery cell according to claim 1, characterized in that: The explosion-proof valve comprises a pressure relief groove opened on the installation wall.

3. The battery cell according to claim 2, characterized in that: The depth of the air guide groove is smaller than the depth of the pressure relief groove.

4. The battery cell according to claim 2 or 3, characterized in that: The air guide groove and the pressure relief groove are both arranged on a side of the installation wall facing the inner cavity of the shell.

5. The battery cell according to claim 2 or 3, characterized in that: The air guide groove is arranged on a side of the installation wall facing the inner cavity of the shell, and the pressure relief groove is arranged on a side of the installation wall facing away from the inner cavity of the shell.

6. The battery cell according to any one of claims 2 to 5, characterized in that: The air guide groove and the pressure relief groove are arranged at intervals; or, the air guide groove and the pressure relief groove are communicated.

7. The battery cell according to any one of claims 2 to 6, characterized in that: The pressure relief groove includes a first pressure relief groove section and a second pressure relief groove section which are arranged crosswise.

8. The battery cell according to claim 7, characterized in that: The first pressure relief groove section extends along the length direction of the installation wall, and the second pressure relief groove section extends along the width direction of the installation wall.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The air guide groove and the explosion-proof valve are arranged in the length direction of the installation wall, and the air guide groove includes: A first air guide groove section extends along the length direction of the installation wall.

10. The battery cell according to claim 9, characterized in that: There are multiple first air guide groove segments, and the multiple first air guide groove segments are arranged at intervals in the width direction of the installation wall.

11. The battery cell according to claim 10, characterized in that: In each of the air guiding grooves, the distance between any two adjacent first air guiding groove sections is equal.

12. The battery cell according to claim 10, characterized in that: In each of the air guiding grooves, a distance between at least two adjacent first air guiding groove sections is not equal to a distance between another two adjacent first air guiding groove sections.

13. The battery cell according to any one of claims 9 to 12, characterized in that: The air guide groove also includes: A second air guide groove section, wherein the second air guide groove section extends along the width direction of the installation wall, and one end of the first air guide groove section away from the explosion-proof valve is connected to the second air guide groove section and the other end extends toward the explosion-proof valve.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The air guide parts include two air guide parts, which are arranged at intervals in the length direction of the installation wall, and the explosion-proof valve is located between the two air guide parts.

15. The battery cell according to claim 14, characterized in that: The explosion-proof valve is arranged at the central position of the installation wall in the length direction, and the two air guide parts have the same structure and are arranged symmetrically about the center of the explosion-proof valve.

16. The battery cell according to claim 14, characterized in that: The installation wall has a first end and a second end which are arranged opposite to each other in the length direction thereof, 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; Wherein, the area of ​​the air guide portion between the explosion-proof valve and the first end is greater than the area of ​​the air guide portion between the explosion-proof valve and the second end.

17. The battery cell according to any one of claims 1 to 16, characterized in that: The shell body comprises a shell cover and a shell body with an opening, the shell cover covers the opening, and the mounting wall is located on the shell cover or the shell body.

18. The battery cell according to any one of claims 1 to 16, characterized in that: The shell comprises a shell cover and a shell body with an opening, the shell cover covers the opening, the mounting wall is located on the shell cover, a pole is provided on a wall of the shell body opposite to the mounting wall, and the pole is provided with a receiving portion; The electrode assembly includes an active material coating portion and a conductive portion connected to the active material coating portion, and at least a portion of the conductive portion extends into the accommodating portion and is connected to the pole.

19. The battery cell according to claim 18, characterized in that: The accommodating portion includes a first accommodating groove, the surface of the pole facing the active material coating portion is the inner end face of the pole, the notch of the first accommodating groove is formed on the inner end face of the pole, and at least part of the conductive portion is accommodated in the first accommodating groove.

20. The battery cell according to claim 18, characterized in that: The accommodating portion includes a second accommodating groove, the surface of the pole away from the active material coating portion is the outer end face of the pole, the notch of the second accommodating groove is formed on the outer end face of the pole, the second accommodating groove is connected to the interior of the shell through a through hole, the conductive portion is passed through the through hole and is at least partially accommodated in the second accommodating groove.

21. A battery, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 20.

22. An electrical device, characterized in that: Comprising a battery according to claim 21.

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