Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer, battery and electric device, including shell and cover component, the shell has the opening, be equipped with the electrode subassembly in the shell, the cover component is equipped with the opening, the cover component includes the cover body, the cover body is equipped with the liquid injection hole, the liquid injection hole passes through the cover body, the liquid injection hole passes through the cover body, and the liquid injection hole passes through the cover body. A gas guide channel is arranged on one side, close to an electrode assembly, of the cover body, the gas guide channel is communicated with one end, close to the electrode assembly, of the liquid injection hole, and the gas guide channel extends from the liquid injection hole to the side edge of the cover body. Different from the prior art, the utility model can reduce the risk that the electrolyte is easy to spray out or overflow from the liquid injection hole, and avoid the problems of electrolyte pollution and electrolyte loss.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery and an electrical device. Background Art

[0002] The battery cell generally has a cap assembly, which is provided with a liquid injection hole, through which the electrolyte is injected into the battery cell. During the liquid injection process, air is easily introduced into the battery cell. As the amount of liquid injected increases, the internal pressure of the battery cell increases, and the liquid level rises. There is a risk that the electrolyte is easy to spray out or overflow from the liquid injection hole during or after pressure relief, which may cause electrolyte contamination and electrolyte loss.

[0003] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device to solve the technical problem that the electrolyte is easily sprayed out or overflowed from the injection hole, which may cause electrolyte contamination and electrolyte loss.

[0005] To achieve the above objectives, in a first aspect, the present application provides a battery cell, comprising:

[0006] a shell having an opening, wherein an electrode assembly is disposed in the shell; and

[0007] A cover assembly, wherein the cover assembly is arranged at the opening, and the cover assembly includes a cover body, the cover body is provided with an injection hole, the injection hole penetrates the cover body, a gas guide channel is provided on a side of the cover body close to the electrode assembly, the gas guide channel is connected to an end of the injection hole close to the electrode assembly, and the gas guide channel extends from the injection hole toward the side edge of the cover body.

[0008] Different from the prior art, the technical solution of the present application is to provide a gas guide channel on one side of the cover body close to the electrode assembly, the gas guide channel is connected to one end of the injection hole close to the electrode assembly, and the gas guide channel extends from the injection hole toward the side edge of the cover body; during the injection process, the air inside the battery cell is introduced and guided to the injection hole through the gas guide channel of the cover assembly, and is discharged through the injection hole during or after pressure relief, thereby reducing the risk of electrolyte spraying or overflowing from the injection hole and avoiding the problems of electrolyte contamination and electrolyte loss.

[0009] In some embodiments of the present application, the gas guide channel is a gas guide groove provided in the cover body, and a groove formed inwardly on one side of the cover body close to the electrode assembly is the gas guide groove.

[0010] A groove can be processed on one side of the cover body close to the electrode assembly so that the groove is connected to the injection hole to form a gas guide groove, which is convenient for production and manufacturing; at the same time, the weight of the cover body can be reduced and the energy density of the battery cell can be improved.

[0011] In some embodiments of the present application, the gas guide channel is a gas guide groove arranged in the cover body, and a gas guide rib is arranged on one side of the cover body close to the electrode assembly, and the space enclosed by the two gas guide ribs is the gas guide groove.

[0012] A gas guide rib may be provided on one side of the cover body close to the electrode assembly. The gas guide rib may be mounted on the cover body, or the gas guide rib and the cover body may be integrally formed without changing the structure of the cover body, thereby improving the strength of the cover body.

[0013] In some embodiments of the present application, the depth of the gas guide groove is set to show a trend of decreasing from deep to shallow in the direction from the liquid injection hole to the side edge of the cover body.

[0014] The air is more easily concentrated toward the injection hole through the inclined gas guide groove, which facilitates the discharge of air during or after pressure relief.

[0015] In some embodiments of the present application, the gas guide groove includes at least one parallel section, and the parallel section is arranged parallel to the long side or the wide side of the cover assembly.

[0016] It is convenient to process the gas guide groove, reducing the manufacturing cost. At the same time, it is convenient to set the gas guide groove away from the pressure relief mechanism, and there is no need to process the bottom of the pressure relief mechanism.

[0017] In some embodiments of the present application, the distance between the parallel section and the long side or the wide side of the cover assembly is 5%-10% of the width of the cover body.

[0018] A preset distance is provided between the gas guide groove and the long side of the cover assembly, and a preset distance is provided between the gas guide groove and the wide side of the cover assembly, so as to avoid affecting the strength of the cover assembly and the sealing performance of the cover assembly.

[0019] In some embodiments of the present application, the gas guide groove includes a first section extending from the liquid injection hole to the long side of the cover assembly, and a second section extending along the long side of the cover assembly, and the first section is connected end to end with the second section.

[0020] The gas guide groove includes a first section and a second section, the exhaust path is the shortest, the exhaust effect is good, and the manufacturing cost is low. At the same time, it is also convenient for the gas guide groove to avoid the setting of the pressure relief mechanism, and there is no need to process the bottom of the pressure relief mechanism.

[0021] In some embodiments of the present application, the first section is an inclined section, and the inclined section is arranged at a preset angle with the long side of the cover assembly.

[0022] The exhaust path is shortened and the exhaust path is smoother.

[0023] In some embodiments of the present application, the second section is a parallel section, and the parallel section is arranged parallel to the long side of the cover assembly.

[0024] It is convenient to process the gas guide groove and reduce the manufacturing cost.

[0025] In some embodiments of the present application, the gas guide groove is an annular groove, and both ends of the gas guide groove are connected to the liquid injection hole.

[0026] By making the gas guide groove into an annular groove, a gas circulation channel is formed, which facilitates the discharge of air near the wide side of the cover assembly and improves the exhaust effect.

[0027] In some embodiments of the present application, the annular groove has a preset distance from the long side or the wide side of the cover body.

[0028] Avoid affecting the strength of the cover assembly and avoid affecting the sealing of the cover assembly.

[0029] In some embodiments of the present application, the cover body is provided with a pressure relief mechanism, and the annular groove is provided around the pressure relief mechanism.

[0030] In this way, there is no need to process the bottom of the pressure relief mechanism, thereby reducing manufacturing costs.

[0031] In some embodiments of the present application, the gas guide groove includes two annular grooves, which are respectively arranged on both sides of the liquid injection hole.

[0032] In this way, the air on both sides of the liquid injection hole can be discharged through the liquid injection hole through the two annular grooves.

[0033] In some embodiments of the present application, a groove formed inwardly on one side of the cover body close to the electrode assembly is the gas guide groove, and the maximum depth of the groove does not exceed half of the thickness of the cover body.

[0034] In this way, the strength of the cover body is not affected, and the sealing performance of the cover assembly is not affected.

[0035] In some embodiments of the present application, the maximum width of the gas guide groove does not exceed one fifth of the width of the cover body.

[0036] In this way, the width of the gas guide groove is prevented from affecting the strength of the cover body.

[0037] To achieve the above objectives, in a second aspect, the present application provides a battery, comprising any of the battery cells described above.

[0038] To achieve the above objectives, in a third aspect, the present application provides an electrical device, comprising the above battery, wherein the battery is used to supply power to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and shall not be considered as limitations of the present application.

[0040] In the drawings of the specification:

[0041] Figure 1 A schematic diagram of the structure of a vehicle provided for one or more embodiments of the present application;

[0042] Figure 2 A schematic diagram of the structure of a battery pack provided for one or more embodiments of the present application;

[0043] Figure 3 A schematic diagram of the structure of a battery module provided for one or more embodiments of the present application;

[0044] Figure 4 A schematic diagram of the exploded structure of a battery cell provided for one or more embodiments of the present application;

[0045] Figure 5 A schematic diagram of the structure of a cover assembly according to one or more embodiments of the present application;

[0046] Figure 6 A side view of a cover assembly of one or more embodiments of the present application Figure 1 ;

[0047] Figure 7 A side view of a cover assembly of one or more embodiments of the present application Figure 2 ;

[0048] Figure 8 A side view of a cover assembly according to another embodiment of the present invention Figure 1 ;

[0049] Fig. 9 A side view of a cover assembly according to another embodiment of the present invention Figure 2 ;

[0050] Fig.10 A top view of a cover assembly according to one or more embodiments of the present application;

[0051] Fig.11 A top view of a cover assembly according to another embodiment of the present application;

[0052] Fig.12 A perspective view of a cover assembly according to one or more embodiments of the present application;

[0053] Fig.13 This is a three-dimensional view of a cover assembly according to another embodiment of the present application.

[0054] The reference numerals in the above drawings are described as follows:

[0055] 1. Vehicle, 10. Battery, 11. Controller, 12. Motor;

[0056] 20. battery module, 21. battery cell;

[0057] 211, cover assembly, 211a, electrode terminal, 212, housing, 213, electrode assembly;

[0058] 2111, cover body, 2112, liquid injection hole, 2113, gas guide channel, 2114, groove, 2115, gas guide rib, 2116, annular groove, 2117, pressure relief mechanism;

[0059] 21111, bottom surface, 21112, top surface, 21113, side edge, 21113a, long side, 21113b, wide side;

[0060] 21131, parallel section, 21132, first section, 21133, second section;

[0061] 30. Box body, 301. First part, 302. Second part. DETAILED DESCRIPTION

[0062] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions 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.

[0063] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0064] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0065] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, X and / or Y, which means: X exists, Y exists, and X and Y exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in a logical relationship of "or".

[0066] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0067] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0068] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0069] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0070] Unless otherwise clearly specified or limited, in the description of the embodiments of the present application, the terms "install", "connect", "connect", "fix", "set" and the like used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a direct connection, or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0071] The battery cell generally has a cap assembly, which is provided with a liquid injection hole, through which the electrolyte is injected into the battery cell. During the liquid injection process, air is easily introduced into the battery cell. As the amount of liquid injected increases, the internal pressure of the battery cell increases, and the liquid level rises. There is a risk that the electrolyte is easy to spray out or overflow from the liquid injection hole during or after pressure relief, which may cause electrolyte contamination and electrolyte loss.

[0072] In view of this, an embodiment of the present application provides a battery cell, wherein a gas guide channel is provided on a side of a cover body close to the electrode assembly, the gas guide channel is connected to an end of an injection hole close to the electrode assembly, and the gas guide channel extends from the injection hole toward the side edge of the cover body; during the injection process, air inside the battery cell is introduced and guided to the injection hole through the gas guide channel of the cover assembly, and is discharged through the injection hole during or after pressure relief, thereby reducing the risk of electrolyte spraying or overflowing from the injection hole and avoiding problems of electrolyte contamination and electrolyte loss.

[0073] The technical solutions described in the embodiments of the present application are applicable to various devices using batteries. For example, mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. The battery can be a primary battery or a secondary battery, for example, a secondary battery includes a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid (or lead storage) battery, a lithium-ion battery, a sodium-ion battery, a polymer battery, etc.

[0074] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0075] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1 provided for some embodiments of the present application. The vehicle 1 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 10 is provided inside the vehicle 1, and the battery 10 may be provided at the bottom, the head or the tail of the vehicle 1. The battery 10 may be used to power the vehicle 1, for example, the battery 10 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 11 and a motor 12, and the controller 11 is used to control the battery 10 to power the motor 12, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0076] In some embodiments of the present application, the battery 10 can be used not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0077] In order to meet different power requirements, the battery 10 may include a plurality of battery cells 21, where a battery cell 21 refers to the smallest unit that constitutes a battery module or a battery pack. A plurality of battery cells 21 can be connected in series and / or in parallel via electrode terminals for use in various applications. The battery mentioned in the present application includes a battery module or a battery pack. Among them, a plurality of battery cells 21 can be connected in series, in parallel, or in mixed connection, where mixed connection refers to a mixture of series and parallel connection. The battery 10 may also be referred to as a battery pack. In the embodiment of the present application, a plurality of battery cells 21 may directly constitute a battery pack, or may first constitute a battery module 20, which may then constitute a battery pack.

[0078] Figure 2 A schematic structural diagram of a battery 10 according to an embodiment of the present application is shown. Figure 2 In the embodiment, the battery 10 may include a plurality of battery modules 20 and a box 30, and the plurality of battery modules 20 are accommodated inside the box 30. The box 30 is used to accommodate the battery cells 21 or the battery modules 20 to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells 21. The box 30 may be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres, which is not limited in the embodiments of the present application. The material of the box 30 may be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin, which is not limited in the embodiments of the present application.

[0079] In some embodiments, the box body 30 may include a first portion 301 and a second portion 302, the first portion 301 and the second portion 302 cover each other, and the first portion 301 and the second portion 302 jointly define a space for accommodating the battery cell 21. The second portion 302 may be a hollow structure with one end open, and the first portion 301 may be a plate-like structure, and the first portion 301 covers the open side of the second portion 302, so that the first portion 301 and the second portion 302 jointly define a space for accommodating the battery cell 21; the first portion 301 and the second portion 302 may also be hollow structures with one side open, and the open side of the first portion 301 covers the open side of the second portion 302.

[0080] Figure 3 A schematic structural diagram of a battery module 20 according to an embodiment of the present application is shown. Figure 3 In the embodiment, the battery module 20 may include a plurality of battery cells 21, and the plurality of battery cells 21 may be first connected in series or in parallel or in a mixed connection to form a battery module 20, and the plurality of battery modules 20 may then be connected in series or in parallel or in a mixed connection to form a battery 10. In the present application, the battery cell 21 may include a lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., which is not limited in the embodiments of the present application. The battery cell 21 may be cylindrical, flat, rectangular or in other shapes, which is not limited in the embodiments of the present application. The battery cell 21 is generally divided into three types according to the packaging method: cylindrical battery cells 21, cubic square battery cells 21 and soft-pack battery cells 21, which is not limited in the embodiments of the present application. However, for the sake of simplicity of description, the following embodiments are all described using the cubic square battery cell 21 as an example.

[0081] Figure 4 The schematic diagram of the decomposed structure of the battery cell 21 provided in some embodiments of the present application. The battery cell 21 refers to the smallest unit that constitutes the battery. Figure 4 The battery cell 21 includes a cover assembly 211 , a shell 212 and an electrode assembly 213 .

[0082] The cover assembly 211 refers to a component that covers the opening of the shell 212 to isolate the internal environment of the battery cell 21 from the external environment. Without limitation, the shape of the cover assembly 211 can be adapted to the shape of the shell 212 to match the shell 212. Optionally, the cover assembly 211 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the cover assembly 211 is not easily deformed when it is squeezed and collided, so that the battery cell 21 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 211a can be provided on the cover assembly 211. The electrode terminal 211a can be used to electrically connect to the electrode assembly 213 for outputting or inputting electrical energy of the battery cell 21. In some embodiments, the cover assembly 211 can also be provided with a pressure relief mechanism 2117 for releasing the internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. The material of the cover assembly 211 can also be various, 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 cover assembly 211, and the insulating member can be used to isolate the electrical connection components in the housing 212 from the cover assembly 211 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0083] The shell 212 is a component used to cooperate with the cover assembly 211 to form the internal environment of the battery cell 21, wherein the formed internal environment can be used to accommodate the electrode assembly 213, the electrolyte (not shown in the figure) and other components. The shell 212 and the cover assembly 211 can be independent components, and an opening can be set on the shell 212, and the internal environment of the battery cell 21 is formed by covering the opening with the cover assembly 211 at the opening. Without limitation, the cover assembly 211 and the shell 212 can also be integrated. Specifically, the cover assembly 211 and the shell 212 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 212, the cover assembly 211 covers the shell 212. The shell 212 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 213. The shell 212 can be made of a variety of 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.

[0084] The electrode assembly 213 is a component in the battery cell 21 where electrochemical reactions occur. One or more electrode assemblies 213 may be included in the housing 212. The electrode assembly 213 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 pole ear (not shown in the figure). The positive pole ear and the negative pole ear may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ears connect the electrode terminals to form a current loop.

[0085] According to some embodiments of the present application, please refer to Figures 4 to 13 The direction indicated by arrow x is the width direction of the cover body 2111 (i.e. the width extension direction of the cover assembly 211), the direction indicated by arrow y is the length direction of the cover body 2111 (i.e. the length extension direction of the cover assembly 211), and the direction indicated by arrow z is the thickness direction of the cover body 2111.

[0086] The distance indicated by arrow a is the thickness of the cover body 2111, the distance indicated by arrow b is the maximum depth of the groove 2114, the distance indicated by arrow c is the distance between the end of the parallel section 21131 and the wide side 21113b of the cover assembly 211, the distance indicated by arrow d is the width of the cover body 2111, the distance indicated by arrow e is the distance between the parallel section 21131 and the long side 21113a of the cover assembly 211, the distance indicated by arrow f is the distance between the end of the second section 21133 and the wide side 21113b of the cover assembly 211, and the distance indicated by arrow g is the distance between the second section 21133 and the long side 21113a of the cover assembly 211.

[0087] The present embodiment relates to a battery cell, including a shell 212 and a cover assembly 211, the shell 212 has an opening, the cover assembly 211 is arranged at the opening, an electrode assembly 213 is arranged in the shell 212, the cover assembly 211 includes a cover body 2111, the cover body 2111 is provided with a liquid injection hole 2112, the liquid injection hole 2112 penetrates the cover body 2111, a gas guide channel 2113 is provided on a side of the cover body 2111 close to the electrode assembly 213, the gas guide channel 2113 is connected to an end of the liquid injection hole 2112 close to the electrode assembly 213, and the gas guide channel 2113 extends from the liquid injection hole 2112 toward the side edge 21113 of the cover body 2111.

[0088] In some embodiments, positive and negative electrode terminals 211a and a pressure relief mechanism 2117 are provided on the cover body 2111. The gas guide channel 2113 can be provided to bypass the pressure relief mechanism 2117, or can be provided at the bottom of the pressure relief mechanism 2117. When the gas guide channel 2113 is provided at the bottom of the pressure relief mechanism 2117, it is necessary to change the bottom structure of the pressure relief mechanism 2117, which is all within the protection scope of this embodiment.

[0089] In this embodiment, the pressure relief mechanism 2117 is arranged upward in the vertical direction, and the gas guide channel 2113 is located on the bottom surface 21111 of the cover body 2111; in other embodiments, the pressure relief mechanism 2117 is arranged downward in the vertical direction, and the gas guide channel 2113 is located on the top surface of the cover body 2111, or the pressure relief mechanism 2117 is arranged in the horizontal direction, and the gas guide channel 2113 is located on the side of the cover body 2111 close to the electrode assembly 213; all are within the protection scope of this embodiment.

[0090] This embodiment is described by taking the case where the gas guide channel 2113 is located on the bottom surface 21111 of the cover body 2111 as an example.

[0091] In some embodiments, Figures 6 to 9 As shown, the gas guide channel 2113 can be an integral gas channel. As long as an integral gas channel is formed on one side of the cover body 2111 close to the electrode assembly 213, the gas is guided out from the injection hole 2112 during the injection process, which can reduce the risk of the electrolyte being easily ejected or overflowed from the injection hole 2112, thereby avoiding the problems of electrolyte contamination and electrolyte loss.

[0092] like Figures 10 to 13 As shown, the gas guide channel 2113 can also be a separate gas channel, and the gas is guided out from the injection hole 2112 through the separate gas channel to achieve the above-mentioned effects, which are all within the protection scope of this embodiment.

[0093] According to some embodiments of the present application, optionally, Figure 6 and Figure 7 As shown, the gas guide channel 2113 is a gas guide groove arranged on one side of the cover body 2111 close to the electrode assembly 213, and the groove 2114 formed inwardly on one side of the cover body 2111 close to the electrode assembly 213 is the gas guide groove.

[0094] In some embodiments, a groove 2114 can be processed on one side of the cover body 2111 close to the electrode assembly 213 so that the groove 2114 is connected to the injection hole 2112 to form a gas guide groove, which is convenient for production and manufacturing; at the same time, the weight of the cover body 2111 can be reduced and the energy density of the battery cell 21 can be improved.

[0095] In some embodiments, Figure 7 As shown, the depth of the groove 2114 is set to be gradually shallower from the injection hole 2112 to the side edge 21113 of the cover body 2111; during the injection process, the cover body 2111 is set on the shell 212, and the electrolyte is injected into the shell 212. Due to gravity, the air is above the electrolyte, and the injection hole 2112 is higher than the groove 2114 in the thickness direction of the cover body 2111 (i.e., the direction indicated by the arrow z in the figure). The air flows from low to high and is concentrated toward the injection hole 2112, which is convenient for the discharge of air during or after pressure relief.

[0096] According to some embodiments of the present application, optionally, a groove 2114 formed inwardly on one side of the cover body 2111 close to the electrode assembly 213 is a gas guide groove, and the maximum depth of the groove 2114 does not exceed half of the thickness of the cover body 2111 .

[0097] like Figure 6 and Figure 7 As shown, in some embodiments, the thickness of the cover body 2111 is 1-5 mm. In order to avoid affecting the strength of the cover body 2111 and the sealing of the cover assembly 211, the maximum depth of the groove 2114 (the distance indicated by arrow b) does not exceed half of the thickness of the cover body 2111 (the distance indicated by arrow a). The deeper the depth of the groove 2114, the smaller the thickness of the cover body 2111 at the groove 2114.

[0098] According to some embodiments of the present application, optionally, Figure 8 and Fig. 9 As shown, the gas guide channel 2113 is a gas guide groove arranged on the side of the cover body 2111 close to the electrode assembly 213, and a gas guide rib 2115 is arranged on the bottom surface 21111 of the cover body 2111 close to the electrode assembly 213, and the space enclosed by the two gas guide ribs 2115 is the gas guide groove.

[0099] In some embodiments, a gas guide rib 2115 can be provided on the side of the bottom surface 21111 of the cover body 2111 close to the electrode assembly 213. The gas guide rib 2115 can be installed on the side of the cover body 2111 close to the electrode assembly 213, or the gas guide rib 2115 can be integrally formed with the cover body 2111, without changing the structure of the cover body 2111, thereby improving the strength of the cover body 2111.

[0100] In some embodiments, as shown in FIG9 , the depth of the bottom surface of the gas guide groove is set to be shallower from the injection hole 2112 to the side edge 21113 of the cover body 2111. Similar to the above principle, during the injection process, the electrolyte moves downward and the air moves upward. The air passes through the inclined gas guide groove and is more easily concentrated to the injection hole 2112, which facilitates the discharge of air during or after pressure relief.

[0101] According to some embodiments of the present application, optionally, Fig.10 As shown, the gas guide groove includes at least one parallel section 21131 , and the parallel section 21131 is arranged parallel to the long side 21113 a or the wide side 21113 b of the cover assembly 211 .

[0102] In some embodiments, the gas guide groove includes a parallel section 21131 parallel to the wide side 21113b of the cover assembly 211, and a parallel section 21131 is provided at the upper and lower ends of the injection hole 2112 to facilitate the air near the long sides 21113a of the cover assemblies 211 on both sides to enter the injection hole 2112 through the parallel section 21131.

[0103] In some embodiments, the gas guide groove includes a parallel section 21131 parallel to the long side 21113a of the cover assembly 211, and two parallel sections 21131 are provided at the upper and lower ends of the injection hole 2112. The two parallel sections 21131 are connected to each other to facilitate the air near the wide sides 21113b of the cover assemblies 211 at both ends to enter the injection hole 2112 through the parallel sections 21131.

[0104] In the above two embodiments, it is convenient to process the gas guide groove, thereby reducing the manufacturing cost. At the same time, it is convenient to set the gas guide groove away from the pressure relief mechanism 2117, and there is no need to process the bottom of the pressure relief mechanism 2117.

[0105] According to some embodiments of the present application, optionally, Fig.10 As shown, the distance between the parallel section 21131 and the long side 21113 a or the wide side 21113 b of the cover assembly 211 is 5%-10% of the width of the cover body 2111 .

[0106] In some embodiments, the distance from the end of the parallel segment 21131 to the long side 21113a of the cover assembly 211 (as indicated by arrow e) is 5%-10% of the width of the cover body 2111 (as indicated by arrow d); the distance from the end of the parallel segment 21131 to the wide side 21113b of the cover assembly 211 (as indicated by arrow c) is 5%-10% of the width of the cover body 2111 (as indicated by arrow d).

[0107] The space between the end of the parallel section 21131 and the wide side 21113b of the cover assembly 211 (the space indicated by arrow c) is the area where the wide side 21113b of the cover assembly 211 is welded to the shell 212, and the gas guide groove cannot affect the welding at both ends of the cover assembly 211. The space between the end of the parallel section 21131 and the long side 21113a of the cover assembly 211 (the space indicated by arrow e) is the area where the long side 21113a of the cover assembly 211 is sealed to the shell 212.

[0108] There is a preset distance from the gas guide groove to the long side 21113a of the cover assembly 211, and there is a preset distance from the gas guide groove to the wide side 21113b of the cover assembly 211, the purpose of which is to avoid affecting the strength of the cover assembly 211 and avoid affecting the sealing of the cover assembly 211.

[0109] In other embodiments, Fig.11 As shown, the gas guide groove can be arranged in a wave curve or an arc curve, which is also within the protection scope of this embodiment.

[0110] According to some embodiments of the present application, optionally, Fig.12 As shown, the gas guide groove includes a first section 21132 extending from the injection hole 2112 to the long side 21113a of the cover assembly 211, and a second section 21133 extending along the long side 21113a of the cover assembly 211, and the first section 21132 and the second section 21133 are connected end to end.

[0111] Specifically, the first section 21132 extending from the injection hole 2112 to the long side 21113a of the cover assembly 211 in the gas guide groove of the embodiment cannot be narrowly understood as the first section 21132 being perpendicular to the long side 21113a, but should be understood as long as the main trend of the first section 21132 extending is to approach the long side 21113a from the injection hole 2112, for example, the first section 21132 can be set perpendicular to the long side 21113a, can be set obliquely relative to the long side 21113a, or can be set in a curved form. Similarly, the second section 21133 extending along the long side 21113a of the cover assembly 211 should be understood as the main trend of the second section 21133 extending in the same direction as the long side 21113a, and can be a straight line section parallel or approximately parallel to the long side 21113a, or an approximately parallel curve.

[0112] In this way, the gas guide groove includes the first section 21132 and the second section 21133. Compared with other embodiments, the exhaust path is the shortest, the exhaust effect is good, and the manufacturing cost is low. At the same time, it is also convenient for the gas guide groove to avoid the pressure relief mechanism 2117, and there is no need to process the bottom of the pressure relief mechanism 2117.

[0113] According to some embodiments of the present application, optionally, the first section 21132 is an inclined section, and the inclined section is arranged at a preset angle to the long side 21113a of the cover assembly 211 .

[0114] So, relative to Fig.10 In the implementation mode, the first section 21132 is an inclined section, and the first section 21132 is connected to the second section 21133, thereby shortening the exhaust path and making the exhaust path smoother.

[0115] According to some embodiments of the present application, optionally, the second section 21133 is a parallel section 21131 , and the parallel section 21131 is arranged parallel to the long side 21113a of the cover assembly 211 .

[0116] In some embodiments, the distance between the second section 21133 and the long side 21113a of the cover assembly 211 (the distance indicated by arrow g) is 5%-10% of the width of the cover body 2111 (the distance indicated by arrow d); the distance between the second section 21133 and the wide side 21113b of the cover assembly 211 (the distance indicated by arrow f) is 5%-10% of the width of the cover body 2111 (the distance indicated by arrow d). The principle here is as described above, and it is not elaborated in detail, in order to avoid affecting the strength of the cover assembly 211 and the sealing of the cover assembly 211.

[0117] According to some embodiments of the present application, optionally, Fig.13 As shown, the gas guide groove is an annular groove 2116 , and both ends of the gas guide groove are connected to the liquid injection hole 2112 .

[0118] Other structures of the annular groove 2116 Fig.12 The embodiment is the same as that of the embodiment, except that the upper and lower second sections 21133 near the wide side 21113b of the cover assembly 211 are connected through a gas channel.

[0119] In this way, a gas circulation channel is formed by the gas guide groove being an annular groove 2116, which facilitates the discharge of air near the wide side 21113b of the cover assembly 211 and improves the exhaust effect.

[0120] According to some embodiments of the present application, optionally, the annular groove 2116 has a preset distance from the long side 21113 a or the wide side 21113 b of the cover body 2111 .

[0121] In some embodiments, the distance between the annular groove 2116 and the long side 21113a of the cover body 2111 (the distance indicated by arrow g) is 5%-10% of the width of the cover body 2111 (the distance indicated by arrow d); the distance between the annular groove 2116 and the wide side 21113b of the cover assembly 211 (the distance indicated by arrow f) is 5%-10% of the width of the cover body 2111 (the distance indicated by arrow d). The principle here is as described above, and it is not elaborated in detail, in order to avoid affecting the strength of the cover assembly 211 and the sealing of the cover assembly 211.

[0122] In all embodiments, the gas guiding groove has a preset distance from the long side 21113 a or the wide side 21113 b of the cover body 2111 .

[0123] According to some embodiments of the present application, optionally, the cover body 2111 is provided with a pressure relief mechanism 2117 , and the annular groove 2116 is provided around the pressure relief mechanism 2117 .

[0124] In this way, there is no need to process the bottom of the pressure relief mechanism 2117, thereby reducing manufacturing costs.

[0125] According to some embodiments of the present application, optionally, the gas guide groove includes two annular grooves 2116 , which are respectively arranged on both sides of the injection hole 2112 .

[0126] In this way, the two annular grooves 2116 facilitate the air on both sides of the injection hole 2112 to be discharged through the injection hole 2112 .

[0127] According to some embodiments of the present application, optionally, the maximum width of the gas guide groove does not exceed one fifth of the width of the cover body 2111 .

[0128] The width of the gas guide groove is not shown in the figure. The width of the gas guide groove refers to the width of the first section 21132 and the second section 21133 of the gas guide groove in the direction indicated by the arrow x.

[0129] In some embodiments, the width of the gas guide groove is 5-20% of the width of the cover body 2111 (the distance indicated by arrow d).

[0130] In this way, the width of the gas guide groove is prevented from affecting the strength of the cover body 2111 .

[0131] In some embodiments, Fig.12As shown, a gas guide channel 2113 is provided on one side of the cover body 2111 close to the electrode assembly 213, and the gas guide channel 2113 is connected with one end of the injection hole 2112 close to the electrode assembly 213. The gas guide channel 2113 is a gas guide groove provided on the side of the cover body 2111 close to the electrode assembly 213. A groove 2114 formed inwardly on one side of the cover body 2111 close to the electrode assembly 213 is the gas guide groove. The depth of the groove 2114 shows a trend of becoming shallower from the injection hole 2112 to the side edge 21113 of the cover body 2111. The gas guide groove includes a first section 21132 extending from the injection hole 2112 to the long side 21113a of the cover assembly 211, and a second section 21133 extending along the long side 21113a of the cover assembly 211.

[0132] By verifying this embodiment, the following experimental data are obtained:

[0133] For the battery cells 21 without the gas guide grooves on the bottom surface 21111 of the cover body 2111, the proportion of electrolyte spraying or overflowing from the injection hole 2112 during the injection process was 34% (specifically, 68 out of 200 had the problem of electrolyte spraying or overflowing);

[0134] In the battery cell 21 having a gas guide groove on the bottom surface 21111 of the cover body 2111 , the proportion of electrolyte spraying or overflowing from the injection hole 2112 during the injection process was 0.5% (specifically, 1 out of 200 had the problem of electrolyte spraying or overflowing).

[0135] The energy density of the groove 2114 processed on the bottom surface 21111 of the cover body 2111 is increased by 0.08% compared with the energy density of the groove 2114 not processed on the bottom surface 21111 of the cover body 2111.

[0136] In this way, a gas guide channel 2113 is provided on a side of the cover body 2111 close to the electrode assembly 213, the gas guide channel 2113 is connected with the injection hole 2112 at one end close to the electrode assembly 213, and the gas guide channel 2113 extends from the injection hole 2112 toward the side edge 21113 of the cover body 2111; during the injection process, the air inside the battery cell is introduced and guided to the injection hole 2112 through the gas guide channel 2113 on the side of the cover assembly 211 close to the electrode assembly 213, and is discharged through the injection hole 2112 during or after pressure relief, thereby reducing the risk of electrolyte spraying or overflowing from the injection hole 2112 and avoiding the problems of electrolyte contamination and electrolyte loss.

[0137] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0138] 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 shell having an opening, wherein an electrode assembly is disposed in the shell; as well as A cover assembly, wherein the cover assembly is arranged at the opening, and the cover assembly includes a cover body, the cover body is provided with an injection hole, the injection hole penetrates the cover body, a gas guide channel is provided on a side of the cover body close to the electrode assembly, the gas guide channel is connected to an end of the injection hole close to the electrode assembly, and the gas guide channel extends from the injection hole toward the side edge of the cover body.

2. The battery cell according to claim 1, characterized in that: The gas guide channel is a gas guide groove arranged on the cover body, and a groove formed by concavely concavely on one side of the cover body close to the electrode assembly is the gas guide groove.

3. The battery cell according to claim 1, characterized in that: The gas guide channel is a gas guide groove arranged in the cover body, and a gas guide rib is arranged on one side of the cover body close to the electrode assembly, and a space enclosed by two gas guide ribs is the gas guide groove.

4. The battery cell according to claim 2 or 3, characterized in that: The depth of the gas guide groove is set to be gradually reduced from the depth of the liquid injection hole to the side edge of the cover body.

5. The battery cell according to claim 2 or 3, characterized in that: The gas guide groove includes at least one parallel section, and the parallel section is arranged parallel to the long side or the wide side of the cover assembly.

6. The battery cell according to claim 5, characterized in that: The distance between the parallel section and the long side or the wide side of the cover assembly is 5%-10% of the width of the cover body.

7. The battery cell according to claim 2 or 3, characterized in that: The gas guide groove includes a first section extending from the liquid injection hole toward the long side of the cover assembly, and a second section extending along the long side direction of the cover assembly, wherein the first section is connected end to end with the second section.

8. The battery cell according to claim 7, characterized in that: The first section is an inclined section, and the inclined section is arranged at a preset angle with the long side of the cover assembly.

9. The battery cell according to claim 7, characterized in that: The second section is a parallel section, and the parallel section is arranged parallel to the long side of the cover assembly.

10. The battery cell according to claim 2 or 3, characterized in that: The gas guide groove is an annular groove, and both ends of the gas guide groove are connected to the liquid injection hole.

11. The battery cell according to claim 10, characterized in that: The annular groove has a preset distance from the long side or the wide side of the cover body.

12. The battery cell according to claim 10, characterized in that: The cover body is provided with a pressure relief mechanism, and the annular groove is arranged around the pressure relief mechanism.

13. The battery cell according to claim 10, characterized in that: The gas guide groove includes two annular grooves, which are respectively arranged on both sides of the liquid injection hole.

14. The battery cell according to claim 1, characterized in that: The gas guide channel is a gas guide groove arranged on the cover body, and a groove formed inwardly on one side of the cover body close to the electrode assembly is the gas guide groove, and the maximum depth of the groove does not exceed half of the thickness of the cover body.

15. The battery cell according to claim 2 or 3, characterized in that: The maximum width of the gas guide groove does not exceed one fifth of the width of the cover body.

16. A battery, characterized in that: The invention comprises at least one battery cell according to any one of claims 1 to 15.

17. An electrical device, characterized in that: The battery according to claim 16 is used to supply power to the electrical device.

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