Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, a pressure relief structure and a protection component, the housing includes a wall portion. The pressure relief structure is arranged on the wall part. The protection component is arranged on the wall part and located on the outer side of the pressure relief structure, a concave part is formed in the side, facing the pressure relief structure, of the protection component, and a channel is formed in the side wall of the concave part and used for communicating the concave part with external space gas of the battery monomer. The reliability of the battery monomer can be improved.

Description

Technical Field

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

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] In the development of battery technology, how to improve the reliability of battery cells has always been a research direction in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can improve the reliability of the battery cell.

[0005] On the one hand, an embodiment of the present application provides a battery cell. The battery cell includes a housing, a pressure relief structure, and a protective member. The housing includes a wall portion. The pressure relief structure is disposed on the wall portion. The protective member is disposed on the wall portion and is located outside the pressure relief structure. A recess is disposed on a side of the protective member facing the pressure relief structure. A channel is disposed on a side wall of the recess. The channel is used to connect the recess with the gas outside the battery cell.

[0006] In the above scheme, the setting of the channel can realize gas communication between the concave part and the external space of the battery cell, which is conducive to meeting the need for leak detection of the pressure relief structure. The channel is set on the side wall, which can reduce the possibility of electrolyte splashing into the channel and reduce the risk of electrolyte flowing along the channel to the position of the pressure relief structure under the influence of gravity, thereby reducing the impact of the preparation process on the pressure relief structure and improving the reliability of the battery cell.

[0007] In some embodiments, the channel includes a through hole, and a diameter d of the through hole satisfies: 5 μm≤d≤200 μm. Optionally, 10 μm≤d≤100 μm.

[0008] In the above solution, it is helpful to reduce the difficulty of manufacturing the through hole while reducing the height of the side wall as much as possible.

[0009] In some embodiments, the wall portion is provided with a liquid injection hole, and the channel forms an opening on a side of the protection component away from the liquid injection hole.

[0010] In the above scheme, the above arrangement can reduce the possibility of electrolyte overflowing from the injection hole splashing into the channel, further reduce the possibility of electrolyte entering the pressure relief structure along the channel, and improve the reliability of the battery cell.

[0011] In some embodiments, the number of channels is plural.

[0012] In the above solution, the presence of multiple channels can improve the conduction effect between the space in the recess and the external space of the battery cell, and improve the accuracy of gas leakage detection of the pressure relief structure.

[0013] In some embodiments, the housing includes a protrusion protruding from the wall portion, and at least a portion of the protrusion is received in the recessed portion.

[0014] In the above solution, by providing the convex portion, the convex portion can play a positioning role during the process of installing the protection component to the battery cell, thereby reducing the installation accuracy of the protection component, thereby reducing the installation difficulty of the protection component and improving the production yield.

[0015] In some embodiments, the side walls of the concave portion are spaced apart from the convex portion, and the bottom walls of the concave portion are spaced apart from the convex portion.

[0016] In the above scheme, the gap is provided to meet the need for air leakage detection of the pressure relief structure while reducing the matching accuracy between the protection component and the convex portion, thereby reducing the manufacturing cost of the protection component.

[0017] In some embodiments, the convex portion is provided with a ventilating portion, and along the thickness direction of the side wall, the projection of the channel and the projection of the ventilating portion are at least partially overlapped.

[0018] In the above scheme, through the above arrangement, the protection component and the protrusion can achieve interference fit, thereby reducing the possibility of the protection component falling off and meeting the need for air leakage detection of the pressure relief structure.

[0019] In some embodiments, the protection member includes a main body and a connecting portion surrounding the main body, the main body forms a recess, and the connecting portion is connected to the side wall. In the recess direction of the recess, the channel is located on a side of the side wall away from the connecting portion.

[0020] In the above scheme, the above arrangement is helpful to reduce the possibility of impurities blocking the channel during the process of connecting the connecting part to the shell, and reduce the possibility of interference of the connecting part during the manufacturing process of the channel.

[0021] In some embodiments, the connecting portion and the housing are connected via an adhesive layer.

[0022] In the above scheme, the connection between the connection part and the shell is fixedly connected by providing an adhesive layer, and the structure is simple and reliable. When the battery cell is moved or transported, the possibility of the protective component being separated from the battery cell can be reduced, so that the protective component can protect the pressure relief structure for a long time during the preparation of the battery cell, thereby improving the preparation yield of the battery cell.

[0023] In some embodiments, the protection component further includes an indicator mark, which is disposed on the connecting portion and has a color different from that of the main body.

[0024] In the above scheme, by setting the indicator mark, it is helpful for the user or equipment to detect the position deviation or even detachment of the protective component, so as to improve the preparation yield of the battery cell, while reducing the obstruction of the main body by the indicator mark, which is helpful for the user or equipment to detect whether the pressure relief structure is damaged, reduce the possibility of missed detection and false detection of the damaged pressure relief structure, and improve the reliability of the battery cell.

[0025] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell in any of the aforementioned embodiments.

[0026] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery in any of the aforementioned embodiments, and the battery is used to provide electrical energy.

[0027] 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

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of the present application;

[0030] Figure 2 is a schematic diagram of an exploded structure of a battery provided in an embodiment of the present application;

[0031] Figure 3 is a structural schematic diagram of a battery module provided in an embodiment of the present application;

[0032] Figure 4 is a schematic diagram of the structure of a battery cell provided in an embodiment of the present application;

[0033] Figure 5 is a schematic diagram of an exploded structure of a battery cell provided in an embodiment of the present application;

[0034] Figure 6 is a schematic diagram of a partial cross-sectional structure of a battery cell provided in an embodiment of the present application;

[0035] Figure 7 It is a structural schematic diagram of a protection component provided in an embodiment of the present application;

[0036] Figure 8 yes Figure 6 Schematic diagram of the enlarged structure of P;

[0037] Fig. 9 is a structural schematic diagram of another protective component provided in an embodiment of the present application;

[0038] Fig.10 is a schematic diagram of a partial cross-sectional structure of a battery cell provided in an embodiment of the present application;

[0039] Fig.11 This is a structural schematic diagram of another protective component provided in an embodiment of the present application.

[0040] In the attached figure:

[0041] 1000. Vehicles;

[0042] 100, battery; 110, battery cell; 200, controller; 300, motor; 400, housing; 410, first housing portion; 420, second housing portion; 430, storage portion; 500, battery module;

[0043] 10. Outer shell; 11. Wall; 111. End cover; 112. Shell; 12. Liquid injection hole; 13. Protrusion; 131. Breathable portion; 20. Pressure relief structure; 30. Protective component; 31. Recess; 32. Main body; 321. Side wall; 322. Bottom wall; 33. Connecting portion; 34. Adhesive layer; 35. Indicator mark; T1. Channel; T11. Opening; S1. Gap; X. Thickness direction of the side wall; Y. Depression direction of the recess. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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).

[0050] 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.

[0051] 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.

[0052] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0053] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc., which are not limited in the embodiments of the present application.

[0054] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0055] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0056] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0057] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0058] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0059] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0060] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0061] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0062] The pressure relief structure on the battery cell has an important impact on the safety of the battery cell. For example, when a short circuit or overcharge occurs, thermal runaway may occur inside the battery cell, causing a sudden increase in pressure. In this case, the pressure relief structure can be activated to release the internal pressure to the outside to prevent the battery cell from exploding or catching fire.

[0063] The pressure relief structure refers to an element or component that is activated to release the internal pressure or temperature of the battery cell when the internal pressure or temperature reaches a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte and separator in the battery cell. The internal pressure of the battery cell is the pressure inside the shell.

[0064] The pressure relief structure may be in the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and may specifically be a pressure-sensitive element or structure, that is, when the internal pressure of the battery cell reaches a predetermined threshold, the pressure relief structure performs an action or a weak portion provided in the pressure relief structure ruptures, thereby forming an opening or channel for internal pressure relief. The weak portion may be formed by providing notches, grooves or materials with lower strength.

[0065] The "actuation" mentioned in this application means that the pressure relief structure moves or is activated to a certain state, so that the internal pressure of the battery cell can be released. The action produced by the pressure relief structure may include but is not limited to: at least a part of the pressure relief structure is ruptured, broken, torn or opened, etc. When the pressure relief structure is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged from the actuated part as emissions. In this way, the battery cell can be depressurized under controllable pressure, thereby avoiding potential more serious accidents.

[0066] The emissions from the battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases produced by the reaction, flames, etc.

[0067] During the cycle of the battery cell, the pressure relief structure may be activated prematurely or fail when the internal pressure of the battery cell does not reach the threshold. Based on this problem, a protective film is usually provided on the outside of the pressure relief structure to protect the pressure relief structure. However, during the injection of electrolyte, the electrolyte remaining on the processing table or the electrolyte dropped on the shell during injection is easy to adhere to the protective film and affect the appearance. It may also go along the edge of the protective film through the reserved notch of the pressure relief structure to the position of the pressure relief structure and contact the pressure relief structure, causing the pressure relief structure to be corroded and affecting its activation threshold, thereby causing the pressure relief structure to be activated prematurely or fail when the internal pressure of the battery cell does not reach the predetermined threshold, affecting the normal use of the battery and causing safety hazards.

[0068] Based on the above technical problems, the present application provides a technical solution, which reduces the risk of electrolyte entering the pressure relief structure through protective components, thereby reducing the impact of the preparation process on the pressure relief structure.

[0069] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries, such as mobile phones, portable devices, laptop computers, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc., wherein spacecrafts include airplanes, rockets, space shuttles and spacecrafts, etc., electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0070] The battery cells described in the embodiments of the present application are not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are all described using electric vehicles as examples.

[0071] See also Figure 1 , Figure 1 A simple schematic diagram of a vehicle 1000 provided in an embodiment 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 may be provided inside the vehicle 1000, and specifically, for example, the battery 100 may be provided at the bottom, front or rear 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, for example, to control the battery to power the motor 300. The battery may be used for starting and navigating the vehicle 1000, and of course, the battery 100 may also be used to drive the vehicle 1000, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0072] Figure 2 Schematic diagram of an explosion of a battery provided in some embodiments of the present application. Figure 2 As shown, the battery 100 includes a housing 400 and a battery cell (not shown in the figure), and the battery cell is accommodated in the housing 400 .

[0073] The box 400 is used to accommodate the battery cell, and the box 400 can be a variety of structures. In some embodiments, the box 400 may include a first box portion 410 and a second box portion 420, the first box portion 410 and the second box portion 420 cover each other, and the first box portion 410 and the second box portion 420 jointly define a receiving portion 430 for accommodating the battery cell. The second box portion 420 may be a hollow structure with one end open, the first box portion 410 is a plate-like structure, and the first box portion 410 covers the open side of the second box portion 420 to form a box with a receiving portion 430; the first box portion 410 and the second box portion 420 may also be a hollow structure with one side open, and the open side of the first box portion 410 covers the open side of the second box portion 420 to form a box 400 with a receiving portion 430. Of course, the first box portion 410 and the second box portion 420 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0074] In the battery 100, there can be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells is accommodated in the box 400; of course, multiple battery cells can also be connected in series, in parallel, or in mixed connection to form a battery module 500, and multiple battery modules 500 are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 400.

[0075] Figure 3 for Figure 2 A schematic structural diagram of a battery module 500 is shown.

[0076] In some embodiments, Figure 3 As shown, there are multiple battery cells 110, and the multiple battery cells 110 are first connected in series, in parallel, or in mixed series to form a battery module 500. The multiple battery modules 500 are then connected in series, in parallel, or in mixed series to form a whole, and are accommodated in a box.

[0077] Figure 4 It is a schematic diagram of the structure of a battery cell provided in an embodiment of the present application. Figure 5 It is a schematic diagram of the explosion structure of a battery cell provided in an embodiment of the present application. Figure 6 It is a schematic diagram of a partial cross-sectional structure of a battery cell provided in an embodiment of the present application. Figure 7 It is a structural schematic diagram of a protective component provided in an embodiment of the present application. Figure 5 The electrode assembly is not shown.

[0078] See also Figures 4 to 7, an embodiment of the present application provides a battery cell 110. The battery cell 110 includes a housing 10, a pressure relief structure 20, and a protective member 30. The housing 10 includes a wall portion 11. The pressure relief structure is disposed on the wall portion 11. The protective member 30 is disposed on the wall portion 11 and is located outside the pressure relief structure 20. A recess 31 is provided on a side of the protective member 30 facing the pressure relief structure 20, and a channel T1 is provided on a side wall 321 of the recess 31. The channel T1 is used to connect the recess 31 with the external space of the battery cell 110.

[0079] The battery cell 110 also includes an electrode assembly, which is contained in the housing 10. The wall 11 of the housing 10 is enclosed to form a hollow structure, and a cavity for containing the electrode assembly and the electrolyte is formed inside the housing 10. The housing 10 can be in a variety of shapes, such as a cylinder, a cuboid, etc. The shape of the housing 10 can be determined according to the specific shape of the electrode assembly. For example, if the electrode assembly is a cylindrical structure, a cylindrical housing 10 can be selected; if the electrode assembly is a cuboid structure, a cuboid housing 10 can be selected.

[0080] In some embodiments, the housing 10 includes a housing 112 and an end cap 111, and the wall portion 11 may include a wall portion 11 forming the housing 112. Of course, the wall portion 11 may also include a wall portion 11 forming the end cap 111. The end cap 111 is sealed to the housing 112 to form a sealed space for accommodating an electrode assembly and an electrolyte. In some examples, one end of the housing 112 has an opening T11, and the end cap 111 is provided as one and covers the opening T11 of the housing 112. In other examples, both opposite ends of the housing 112 have an opening T11, and the end cap 111 is provided as two, and the two end caps 111 respectively cover the two openings T11 of the housing 112.

[0081] Without limitation, the shape of the end cap 111 can be adapted to the shape of the housing 112 to match the housing 112. Optionally, the end cap 111 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 111 is not easily deformed when squeezed and collided, so that the battery cell 110 can have a higher structural strength and the safety performance can also be improved.

[0082] The shell 112 can be in various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 112 can be determined according to the specific shape and size of the electrode assembly. The shell 112 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0083] A pressure relief structure 20 is provided on the wall 11. When the electrode assembly undergoes thermal runaway, the high-temperature gas generated by the runaway inside the shell 112 can reach the position of the pressure relief structure 20. The pressure relief structure 20 is pushed open under the action of the impact force, and the high-temperature gas can be released in time to ensure the subsequent use of the battery cell 110. It should be noted that the pressure relief structure 20 can be provided on the end cover 111 or on the shell 112, and the embodiment of the present application does not limit this.

[0084] The protective member 30 is used to protect the pressure relief structure 20. Specifically, the protective member 30 can prevent sharp objects from damaging the pressure relief structure 20, prevent liquids such as electrolyte from contaminating and corroding the pressure relief structure 20, or prevent foreign matter, dust, etc. from falling into the pressure relief structure 20 to affect the appearance of the battery cell 110. Exemplarily, the material of the protective member 30 may include thermoplastic polyester (Polyethylene terephthalate, PET). The protective member 30 made of PET material can improve the plasticity, tensile strength, impact strength and transparency of the protective member 30, so that the structure of the protective member 30 is stable, and the risk of deformation of the protective member 30 after long-term use is reduced, so that the pressure relief structure 20 in the battery cell 110 provided with the protective member 30 can be inspected during the production stage.

[0085] The protective member 30 can cover at least part of the pressure relief structure 20 from the outside. The "outside" mentioned here refers to the outside of the battery cell 110 as a whole. For the pressure relief structure 20, it is the side of the pressure relief structure 20 that is away from the enclosed space. The protective member 30 can cover at least part of the pressure relief structure 20, that is, the orthographic projection of the protective member 30 on the pressure relief structure 20 and the pressure relief structure 20 have an overlapping area. The orthographic projection of the protective member 30 on the pressure relief structure 20 can only overlap at least part of the pressure relief structure 20, or it can completely cover the pressure relief structure 20.

[0086] The protection component 30 has a variety of structural dimensions. The contour shape of the protection component 30 may be the same as the contour shape of the pressure relief hole of the pressure relief structure 20 or may be different from the contour shape of the pressure relief hole.

[0087] The protective component 30 provided in the embodiment of the present application is suitable for use in the preparation or transportation of the battery cell 110, and can better protect the pressure relief structure 20. It should be noted that the protective component 30 provided in the embodiment of the present application can also be applied to other scenarios according to actual use conditions, and the embodiment of the present application does not limit this. For example, during the use of the battery cell 110, the battery cell 110 may be provided with a protective component 30 or may not be provided with a protective component 30.

[0088] During the preparation of the battery cell 110, it is usually necessary to detect the leakage of the pressure relief structure 20 in the battery cell 110 by means of gas detection or the like. Specifically, during gas detection, the air near the pressure relief structure 20 will be evacuated and filled with a specific gas of a certain pressure, such as helium. Then the specific gas near the pressure relief structure 20 will be evacuated, or the battery cell 110 will be transferred to other workstations. After standing for a period of time, the concentration of the specific gas around the pressure relief structure 20 is detected by an instrument. If the detected concentration is lower than the preset value, it means that there is no leakage in the pressure relief structure 20; if the detected concentration is higher than the preset value, it means that there is a leakage problem at the position of the pressure relief structure 20.

[0089] The protective member 30 covers the pressure relief structure 20 to ensure the effective implementation of the gas detection process. Usually, the protective member 30 and the pressure relief structure 20 are spaced apart, and there is a certain space between the two. If there is a gas leakage problem in the pressure relief structure 20, the space can be connected to the inside of the battery cell 110 through the gas leakage of the pressure relief structure 20. Therefore, the gas leakage detection of the pressure relief structure 20 can be realized by means of the space between the protective member 30 and the pressure relief structure 20.

[0090] On this basis, in the embodiment of the present application, a channel T1 is provided on the side wall 321 of the protective member 30, and the channel T1 can be provided through the side wall 321 along the thickness direction X of the side wall. The embodiment of the present application does not limit the shape and size of the channel T1. For example, the channel T1 can be a circular hole, a polygonal hole or a through hole structure of other irregular shapes.

[0091] The concave portion 31 and the external space of the battery cell 110 can be connected to the gas through the channel T1. Further, after the protection member 30 is connected to the battery cell 110, the gas in the space formed by the concave portion 31 and the gas in the external space of the protection member 30 are connected. The "external space of the protection member 30" mentioned here refers to: after the protection member 30 is connected to the battery cell 110, the space on the side of the protection member 30 away from the battery cell 110.

[0092] In the embodiment of the present application, the provision of the channel T1 can achieve gas communication between the recess 31 and the external space of the battery cell 110, which is conducive to meeting the need for leakage detection of the pressure relief structure 20. The channel T1 is provided on the side wall 321, which can reduce the possibility of electrolyte splashing into the channel T1, and reduce the risk of the electrolyte flowing along the channel T1 to the position of the pressure relief structure 20 under the influence of gravity, thereby reducing the impact of the preparation process on the pressure relief structure 20 and improving the reliability of the battery cell 110.

[0093] Figure 8 yes Figure 6 Schematic diagram of the enlarged structure of P.

[0094] In some optional embodiments, see Figure 8 The channel T1 includes a through hole, and the aperture d of the through hole satisfies: 5 μm≤d≤200 μm. Optionally, 10 μm≤d≤100 μm.

[0095] Optionally, the aperture of the through hole includes 5 μm, 10 μm, 20 μm, 30 μm, 50 μm, 100 μm or 200 μm. Furthermore, when d satisfies: 10 μm≤d≤100 μm, the difficulty of manufacturing the through hole can be further reduced.

[0096] Optionally, when the cross-sectional shape of the through hole is circular, the aperture may be the diameter or radius of the cross-sectional shape. Alternatively, in some other examples, when the cross-sectional shape of the through hole is polygonal, the aperture refers to the diameter or radius of the circle corresponding to the polygon with the same area. Exemplarily, when the cross-sectional shape of the through hole is rectangular, the size of the aperture is the diameter or radius corresponding to the circular area with the same area as the rectangular area.

[0097] In these optional embodiments, it is helpful to reduce the difficulty of manufacturing the through hole while reducing the height of the side wall 321 as much as possible.

[0098] In some optional embodiments, see Figure 5 A liquid injection hole 12 is provided on the wall portion, and the channel T1 forms an opening T11 on a side of the protection member 30 away from the liquid injection hole 12 .

[0099] During the preparation of the battery cell 110, after the electrode assembly is arranged in the hollow structure of the housing 10, it is necessary to inject electrolyte into the hollow structure through the injection hole 12. Optionally, the injection hole 12 can be arranged on the end cover 111.

[0100] The opening T11 of the channel T1 can be connected to the external space of the battery cell 110. Optionally, the channel T1 also includes a communication port, which is formed on the side of the side wall 321 facing the recess 31. The communication port can be connected to the space in the recess 31. In some embodiments, the channel T1 penetrates the side wall 321 along the thickness direction X of the side wall so that the opening T11 and the communication port coincide along the thickness direction X of the side wall. In other examples, the channel T1 can extend along the contour shape of the side wall 321 inside the side wall 321 to increase the extension length of the channel T1 and further reduce the possibility of the electrolyte entering the pressure relief structure 20 along the channel T1.

[0101] In these optional embodiments, the above-mentioned configuration can reduce the possibility of electrolyte overflowing from the injection hole 12 splashing into the channel T1, further reducing the possibility of electrolyte entering the pressure relief structure 20 along the channel T1, thereby improving the reliability of the battery cell 110.

[0102] Fig. 9 This is a structural schematic diagram of another protective component provided in an embodiment of the present application.

[0103] In some optional embodiments, see Fig. 9 , the number of channels T1 is multiple.

[0104] Optionally, multiple channels T1 are arranged at intervals on the side wall 321, and the arrangement of the multiple channels T1 is not limited in the embodiment of the present application. For example, multiple channels T1 can be arranged side by side in a single direction, or multiple channels T1 can be arranged in an array in two directions. The shapes and sizes of the multiple channels T1 can be the same or different. And the spacing between adjacent channels T1 can be the same or different.

[0105] Alternatively, the plurality of openings T11 of the plurality of channels T1 may be provided on one or more sides of the protection member 30 away from the injection hole 12 .

[0106] In these optional embodiments, the presence of multiple channels T1 can improve the conduction effect between the space in the recess 31 and the external space of the battery cell 110 , and improve the accuracy of leakage detection of the pressure relief structure 20 .

[0107] In some optional embodiments, see Figure 6 and Figure 8 The housing 10 includes a protrusion 13 , which protrudes from the wall portion 11 , and at least a portion of the protrusion 13 is accommodated in the recess 31 .

[0108] In some embodiments, the pressure relief structure 20 is disposed on the wall portion 11, and the wall portion 11 is also provided with a pressure relief hole at a corresponding position to reduce the influence of the wall portion 11 on the pressure relief hole when the pressure relief structure 20 is actuated. The convex portion 13 can be disposed around the circumference of the pressure relief hole to increase the strength of the wall portion 11 at this position.

[0109] The convex portion 13 protrudes from the wall portion 11. Specifically, the convex portion 13 is located outside the battery cell 110, and the convex portion 13 is arranged to protrude from the wall portion 11 in a direction away from the enclosed space. At least part of the convex portion 13 is accommodated in the concave portion 31, that is, a part of the convex portion 13 is accommodated in the concave portion 31, or the entire convex portion 13 is accommodated in the concave portion 31.

[0110] In these optional embodiments, by providing the protrusion 13, the protrusion 13 can play a positioning role when the protection member 30 is installed on the battery cell 110, thereby reducing the installation accuracy of the protection member 30, thereby reducing the installation difficulty of the protection member 30 and improving the production yield.

[0111] In some optional embodiments, see Figure 6 and Figure 8A gap S1 is defined between the side wall 321 and the bottom wall 322 of the recess 31 and the projection 13 .

[0112] A gap S1 is provided between the side wall 321 of the recess 31 and the protrusion 13, and a gap S1 is also provided between the bottom wall 322 of the recess 31 and the protrusion 13, and the two gaps S1 are connected. In addition, the communication port of the channel T1 is also connected to the gap S1.

[0113] In these optional embodiments, the gap S1 is provided to meet the need for air leakage detection of the pressure relief structure 20 while reducing the matching accuracy between the protection member 30 and the protrusion 13 , thereby reducing the manufacturing cost of the protection member 30 .

[0114] Fig.10 It is a schematic diagram of a partial cross-sectional structure of a battery cell provided in an embodiment of the present application.

[0115] In some optional embodiments, see Fig.10 The convex portion 13 is provided with a ventilating portion 131 , and along the thickness direction X of the side wall, the projection of the channel T1 and the projection of the ventilating portion 131 are at least partially overlapped.

[0116] Optionally, the air permeable portion 131 includes a through hole structure and a groove. For example, the through hole structure is formed by penetrating the convex portion 13 along the thickness direction of the convex portion 13, or the groove is formed by a depression on one side of the convex portion 13 away from the enclosed space.

[0117] The projection of the channel T1 and the projection of the vent portion 131 are at least partially overlapped. Taking the channel T1 as a through-hole structure as an example, the orthographic projection of the channel T1 on the vent portion 131 and the vent portion 131 have an overlapping area. The orthographic projection of the channel T1 on the vent portion 131 may only at least partially overlap with the vent portion 131, or may completely overlap.

[0118] In these optional embodiments, through the above-mentioned arrangement, the protection member 30 and the protrusion 13 can achieve interference fit, thereby reducing the possibility of the protection member 30 falling off and meeting the need for air leakage detection of the pressure relief structure 20.

[0119] In some optional embodiments, see Figure 6 and Fig.10 The protection member 30 includes a main body 32 and a connecting portion 33 surrounding the main body 32. The main body 32 forms a recess 31. The connecting portion 33 is connected to the side wall 321. In the recess direction Y of the recess, the channel T1 is located on the side of the side wall 321 away from the connecting portion 33.

[0120] Optionally, the main body 32 includes a side wall 321 and a bottom wall 322 , and the side wall 321 and the bottom wall 322 may be used to form the recess 31 .

[0121] The connection portion 33 is used for connecting the protection member 30 and the housing 10. Optionally, the connection portion 33 can realize fixed connection between the protection member 30 and the housing 10 by bonding, welding, bolt connection, riveting, clamping, etc.

[0122] The connecting portion 33 is connected to the side wall 321. Optionally, the connecting portion 33 may be an integral structure, and the projection shape of the connecting portion 33 along the concave direction Y of the concave portion may be a continuous closed shape. Alternatively, the connecting portion 33 includes a plurality of connecting sub-portions, which surround the side wall 321 and are arranged at intervals.

[0123] In the recess direction Y of the recess, the channel T1 is located on a side of the side wall 321 away from the connecting portion 33 , that is, the channel T1 is located on a side of the side wall 321 close to the bottom wall 322 .

[0124] In these optional embodiments, the above arrangement helps to reduce the possibility of impurities blocking the channel T1 during the process of connecting the connecting portion 33 to the housing 10, and reduces the possibility of interference of the connecting portion 33 during the manufacturing process of the channel T1.

[0125] In some optional embodiments, see Figure 8 The connecting portion 33 and the housing 10 are connected via an adhesive layer 34 .

[0126] The adhesive layer 34 may be disposed on the surface of the connection portion 33, and the adhesive layer 34 includes but is not limited to adhesive glue, and the adhesive layer 34 is used to achieve relative fixation between the protective member 30 and the housing 10. The adhesive layer 34 may completely cover the surface of the connection portion 33, or may be disposed only on a partial area of ​​the surface of the connection portion 33, and the embodiment of the present application is not limited to this. Exemplarily, the adhesive layer 34 and the channel T1 on the side wall 321 are staggered to reduce the possibility that the adhesive material in the adhesive layer 34 overflows and blocks the channel T1.

[0127] In these optional embodiments, the connection portion 33 and the housing 10 are fixedly connected by providing an adhesive layer 34, and the structure is simple and reliable. When the battery cell 110 is moved or transported, the possibility of the protective member 30 being separated from the battery cell 110 can be reduced, so that the protective member 30 can protect the pressure relief structure 20 for a long time during the preparation of the battery cell 110, thereby improving the preparation yield of the battery cell 110.

[0128] Fig.11 This is a structural schematic diagram of another protective component provided in an embodiment of the present application.

[0129] In some optional embodiments, see Fig.11The protection member 30 further includes an indication mark 35, which is disposed on the connection portion 33. The color of the indication mark 35 is different from that of the main body 32.

[0130] Optionally, the indicator mark 35 can be disposed on the surface of the connecting portion 33 facing away from the housing 10 by coating or other processes. Alternatively, during the production of the protective member 30 , a dyeing material is doped into the connecting portion 33 of the protective member 30 to form the indicator mark 35 .

[0131] Optionally, the area of ​​the indicator mark 35 may be the same as the area of ​​the connecting portion 33 , or the indicator mark 35 may be provided in a local area of ​​the connecting portion 33 .

[0132] Optionally, the material of the main body 32 may be made of a transparent material, and the connecting portion 33 may be an integral structure with the main body 32. The color of the indicator mark 35 may be a clear indicator color, such as blue or green.

[0133] In these optional embodiments, by setting the indicator mark 35, it is helpful for the user or equipment to detect the position deviation or even the detachment of the protective component 30, so as to improve the preparation yield of the battery cell 110, while reducing the obstruction of the main body 32 by the indicator mark 35, which is helpful for the user or the equipment to detect whether the pressure relief structure 20 is damaged, reduce the possibility of missed detection and false detection of the damaged pressure relief structure 20, and improve the reliability of the battery cell 110.

[0134] In a second aspect, an embodiment of the present application provides a battery 100, comprising a battery cell 110 in any of the aforementioned embodiments.

[0135] It should be noted that the electrical device provided in the embodiment of the present application has the beneficial effects of the battery 100 in any of the aforementioned embodiments. For details, please refer to the aforementioned description of the beneficial effects of the battery 100, and the embodiment of the present application will not be repeated here.

[0136] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery 100 in any of the aforementioned embodiments, and the battery 100 is used to provide electrical energy.

[0137] According to some embodiments of the present application, please refer to Figures 4 to 8 as well as Fig.11 The battery cell 110 includes a housing 10, a pressure relief structure 20, and a protective member 30. The housing 10 includes a wall 11. The pressure relief structure is disposed on the wall 11. The protective member 30 is disposed on the wall 11 and is located outside the pressure relief structure 20. A recess 31 is disposed on the side of the protective member 30 facing the pressure relief structure 20. A channel T1 is disposed on a side wall 321 of the recess 31. The channel T1 is used to connect the recess 31 with the external space of the battery cell 110.

[0138] The housing 10 is provided with a liquid injection hole 12, and the channel T1 forms an opening T11 on one or more sides of the protection member 30 from the liquid injection hole 12. The number of channels T1 includes a plurality. The housing 10 includes a convex portion 13, the convex portion 13 protrudes from the wall portion 11, and the convex portion 13 is accommodated in the concave portion 31. A gap S1 is provided between the side wall 321 and the bottom wall 322 of the concave portion 31 and the convex portion 13.

[0139] The protection member 30 includes a main body 32 and a connecting portion 33 surrounding the main body 32, the main body 32 forms a recess 31, and the connecting portion 33 is connected to the side wall 321. In the recess direction Y of the recess, the channel T1 is located on a side of the side wall 321 away from the connecting portion 33. The connecting portion 33 and the housing 10 are connected by an adhesive layer 34.

[0140] The protection member 30 further includes an indication mark 35 , which is disposed on the connection portion 33 . The color of the indication mark 35 is different from that of the main body 32 .

[0141] 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 wall portion; A pressure relief structure, arranged on the wall; A protective component is arranged on the wall and located outside the pressure relief structure. A recess is provided on the side of the protective component facing the pressure relief structure. A channel is provided on the side wall of the recess for connecting the recess with the gas outside the battery cell.

2. The battery cell according to claim 1, characterized in that: The channel includes a through hole, and a pore size d of the through hole satisfies: 5 μm≤d≤200 μm; optionally, 10 μm≤d≤100 μm.

3. The battery cell according to claim 1, characterized in that: The wall portion is provided with a liquid injection hole, and the channel forms an opening on a side of the protection member away from the liquid injection hole.

4. The battery cell according to claim 1, characterized in that: The number of the channels is multiple.

5. The battery cell according to claim 1, characterized in that: The housing includes a convex portion protruding from the wall portion, and at least a portion of the convex portion is accommodated in the concave portion.

6. The battery cell according to claim 5, characterized in that: The side wall of the concave portion is spaced apart from the convex portion, and the bottom wall of the concave portion is spaced apart from the convex portion.

7. The battery cell according to claim 5 or 6, characterized in that: The convex portion is provided with a ventilating portion, and along the thickness direction of the side wall, the projection of the channel and the projection of the ventilating portion are at least partially overlapped.

8. The battery cell according to claim 1, characterized in that: The protection member includes a main body and a connecting portion surrounding the main body, the main body forms the recess, and the connecting portion is connected to the side wall; In the recessed direction of the recessed portion, the channel is located at a side of the side wall away from the connecting portion.

9. The battery cell according to claim 8, characterized in that: The connecting portion and the housing are connected via an adhesive layer.

10. The battery cell according to claim 8, characterized in that: The protection component further includes an indication mark, which is disposed on the connection portion, and a color of the indication mark is different from a color of the main body portion.

11. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 10.

12. An electrical device, characterized in that: Comprising the battery of claim 11, the battery is used to provide electrical energy.

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