Battery cell, battery pack and electrical device

Abstract

The present disclosure belongs to the technical field of batteries. Disclosed are a battery cell, a battery pack and an electrical device. The battery cell comprises a casing assembly, a bare cell, terminal posts, insulating members and a blocking member. The bare cell is arranged inside the casing assembly. The terminal posts are arranged on the casing assembly. The insulating members are arranged on the casing assembly; each insulating member is arranged around the axis of a terminal post; and the insulating member corresponding to at least one terminal post is provided with a mounting hole, the mounting hole communicating the interior of the casing assembly with the outside. The blocking member covers the mounting hole; and the blocking member is provided with vent holes, the magnitude of the porosity of the vent holes being configured such that gases in the casing assembly can be discharged outwards, while preventing impurities outside the casing assembly from entering the inside of the casing assembly.

Description

Battery monomer, battery pack and electric device

[0001] Cross-reference to related applications

[0002] The present disclosure is based on the Chinese patent application No. 202420744573.4, filed on April 11, 2024, entitled "Battery monomer, battery pack and electric device", and claims the priority of the Chinese patent application No. 202420744573.4, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of battery, in particular to a battery monomer, a battery pack and an electric device. BACKGROUND

[0004] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in energy storage fields and the like. Generally, a battery monomer is provided with a mounting hole to discharge gas inside the battery monomer, and the battery monomer is also provided with a shielding piece for blocking the leakage of electrolyte. The gas inside the battery monomer can flow to the outside through the shielding piece.

[0005] In the related art, the processing difficulty of the battery monomer is high.

[0006] Practical new type content

[0007] To solve the above technical problems, the present disclosure provides a battery monomer, a battery pack and an electric device to reduce the processing difficulty of the battery monomer.

[0008] The present disclosure is implemented by the following technical solutions.

[0009] A first aspect of the embodiments of the present disclosure provides a battery monomer, comprising:

[0010] A housing assembly;

[0011] A bare cell arranged inside the housing assembly;

[0012] A pole arranged in the housing assembly, the pole is electrically connected with the tab of the bare cell, and the number of the poles is at least two;

[0013] An insulating piece arranged in the housing assembly, the insulating piece surrounds the circumferential direction of the pole, and the insulating piece corresponding to at least one of the poles is formed with a mounting hole, the mounting hole is communicated with the inside of the housing assembly and the outside;

[0014] A shielding member covers the mounting hole and is connected to the insulating member, and the shielding member has a gas-permeable hole with a porosity configured to allow gas in the shell assembly to be discharged outward and to inhibit foreign matter outside the shell assembly from entering the shell assembly.

[0015] In the scheme of the embodiments of the present disclosure, the insulating member is formed with a mounting hole that is in communication with the inside of the shell assembly and the outside. The shielding member covers the mounting hole and is connected to the insulating member. In the process of connecting the shielding member to the insulating member, the size of the insulating member is relatively large along the arrangement direction of the pole and the battery monomer, which alleviates the need for repeated adjustment of the position of the shielding member, thereby reducing the processing difficulty of the battery monomer. Furthermore, the shielding member is formed with a gas-permeable hole that allows gas in the shell assembly to be discharged outward and blocks foreign matter from entering the inside of the shell assembly. The gas-permeable hole structure does not need to be provided with a complex mechanical structure, thereby realizing one-way flow of the mounting hole, and the shielding member structure is simple and has a relatively low cost.

[0016] In an embodiment, the shielding member includes a molecular sieve.

[0017] In the scheme of the embodiments of the present disclosure, the shielding member includes a molecular sieve. The molecular sieve has good water absorption and can absorb water from the outside, thereby alleviating the entry of water vapor into the battery monomer. Furthermore, the molecular sieve has good thermal stability and can remain stable in the case of a large amount of heat generated in the working process of the battery monomer, thereby having a long service life.

[0018] In an embodiment, the porosity of the molecular sieve ranges from 20% to 90%, and / or the size of the molecular sieve along the arrangement direction of the pole and the bare battery core ranges from 1 mm to 2 mm.

[0019] In the scheme of the embodiments of the present disclosure, the porosity of the molecular sieve and the size of the molecular sieve are within a suitable range, and the molecular sieve can balance the rapid discharge of gas in the battery monomer and the good blocking of foreign matter from the outside into the inside of the shell assembly.

[0020] In an embodiment, the shielding member includes a gas-permeable film.

[0021] In the scheme of the embodiments of the present disclosure, the gas-permeable film has high gas permeability, and the gas in the battery monomer can be discharged to the outside relatively smoothly, thereby having a high exhaust efficiency. Furthermore, the gas-permeable film has good waterproof ability and can better block the entry of external moisture into the battery monomer.

[0022] In an embodiment, the porosity of the gas-permeable film ranges from 20% to 75%, and / or the size of the gas-permeable film along the arrangement direction of the pole and the bare battery core ranges from 0.2 mm to 1.6 mm.

[0023] In the embodiments of the present disclosure, the porosity of the air permeable film and the thickness of the air permeable film are within a suitable range, so that the air in the battery monomer can be quickly discharged and the foreign matters from the outside can be better blocked from entering the inside of the shell assembly.

[0024] In an embodiment, the insulating pieces corresponding to the at least two pole columns are each formed with the air permeable hole.

[0025] In the embodiments of the present disclosure, the insulating pieces corresponding to the at least two pole columns are each formed with the mounting hole. The battery monomer can adapt to a larger gas production efficiency, and the mounting holes can quickly discharge the gas in the inside of the shell assembly to the outside.

[0026] In an embodiment, the single insulating piece is formed with at least two mounting holes, and the mounting holes are arranged at intervals along the circumference of the insulating piece, and each mounting hole is provided with the shielding piece.

[0027] In the embodiments of the present disclosure, the single insulating piece is formed with at least two mounting holes, and the mounting holes are arranged at intervals along the circumference of the insulating piece. The arrangement of the mounting holes can make full use of the circumferential area of the insulating piece, thereby providing a higher gas discharge efficiency.

[0028] In an embodiment, the ratio between the width of the mounting hole and the width of the insulating piece is in the range of 0.4-0.6, as projected along the arrangement direction of the pole column and the bare electric core.

[0029] In the embodiments of the present disclosure, the ratio between the width of the mounting hole and the width of the insulating piece is within a suitable range, so that the gas discharge efficiency of the mounting hole and the strength of the insulating piece itself can be considered, so that the strength of the insulating piece is as high as possible.

[0030] In an embodiment, the pore diameter of the air permeable hole is in the range of 400 nm-400 μm.

[0031] In the embodiments of the present disclosure, the pore diameter of the air permeable hole is within a suitable range, so that the gas in the inside of the shell assembly can be quickly discharged to the outside and the shielding piece can better block the external foreign matters from entering the inside of the shell assembly through the mounting hole.

[0032] In an embodiment, the shielding piece is located at one end of the mounting hole away from the battery monomer.

[0033] In the embodiments of the present disclosure, the shielding piece is located at one end of the mounting hole away from the battery monomer. The shielding piece is as far away from the bare electric core as possible, so as to alleviate the corrosion of the shielding piece caused by the contact of the electrolyte during the working process.

[0034] In an embodiment, the surface of the housing assembly facing the bare battery cell is a first surface, the surface of the shielding member facing the bare battery cell is a second surface, and the height difference between the second surface and the first surface ranges from 2.5 mm to 3.5 mm along the arrangement direction of the pole and the bare battery cell.

[0035] In an embodiment of the present disclosure, the height difference between the first surface and the second surface is within a suitable range, which can balance the electrolyte contacting the shielding member and the connection strength between the shielding member and the insulating member.

[0036] In an embodiment, the shielding member is at least partially located in the mounting hole,

[0037] In an embodiment of the present disclosure, the shielding member is at least partially located in the mounting hole, the connection strength between the shielding member and the pole is high, and the shielding member does not need to be connected to the hole wall of the mounting hole through an additional connecting member, thereby further simplifying the installation process.

[0038] In an embodiment, the projection area of the pole is a rectangle along the arrangement direction of the pole and the bare battery cell, the projection area of the insulating member is a square ring surrounding the projection area of the pole, and the ratio between the size of the mounting hole and the size of the insulating member ranges from 1 / 3 to 2 / 3 along the length direction of the mounting hole.

[0039] In an embodiment of the present disclosure, the ratio between the size of the mounting hole and the size of the insulating member is within a suitable range along the length direction of the mounting hole, which balances the exhaust efficiency of the mounting hole and the strength of the insulating member itself, so that the strength of the insulating member is as high as possible.

[0040] The second aspect of the present disclosure provides a battery pack, comprising:

[0041] a box body;

[0042] The battery cell of any one of the above is arranged in the interior of the box body.

[0043] The third aspect of the embodiment of the present disclosure provides a power utilization device, comprising:

[0044] a device body;

[0045] The battery pack of any one of the above is used to supply power to the device body.

[0046] Effects of the utility model:

[0047] The mounting hole is formed in the insulating piece, and the mounting hole is communicated with the inside of the shell assembly and the outside. The shielding piece covers the mounting hole and is connected with the insulating piece. In the arrangement direction of the pole and the battery monomer, the size of the insulating piece is large, and in the process of connecting the shielding piece with the insulating piece, the situation that the shielding piece needs to be repeatedly adjusted is relieved, thereby reducing the processing difficulty of the battery monomer. In addition, the shielding piece is formed with the air hole, and the air hole can exhaust the gas in the shell assembly and block the sundries from entering the inside of the shell assembly. The air hole structure does not need to set a complex mechanical structure, thereby realizing the one-way flow of the mounting hole, and the shielding piece structure is simple and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0048] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the present disclosure. Moreover, like reference numerals designate like parts throughout the several views in the drawings. In the drawings:

[0049] FIG. 1 is a structural schematic diagram of a battery monomer according to a first embodiment of the present disclosure;

[0050] FIG. 2 is an assembly schematic diagram of a shielding piece and an insulating piece according to an embodiment of the present disclosure;

[0051] FIG. 3 is a sectional view of position A in FIG. 2;

[0052] FIG. 4 is a structural schematic diagram of an insulating piece according to an embodiment of the present disclosure;

[0053] FIG. 5 is an assembly schematic diagram of an insulating piece and a pole according to an embodiment of the present disclosure;

[0054] FIG. 6 is a structural schematic diagram of a battery monomer according to a second embodiment of the present disclosure.

[0055] Reference signs 1, shell assembly; 1a, first surface; 1b, second surface; 2, bare battery core; 3, pole; 4, shielding piece; 4a, air hole; 5, insulating piece; 5a, mounting hole. DETAILED DESCRIPTION

[0056] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise noted, the terms "including" and "comprising" are open-ended and do not exclude the presence of unrecited elements or limitations.

[0058] In the description of the embodiments of the disclosure, the technical terms "first", "second", "third" and the like 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 disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0059] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The occurrence of the phrase in various places in the specification is not necessarily all referring to the same embodiment, nor is it necessarily referring to a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0060] In the description of the embodiments of the disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0061] In the description of the embodiments of the disclosure, the technical terms "top", "bottom", "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the disclosure and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed, operated or used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the disclosure.

[0062] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the disclosure can be understood according to the specific circumstances.

[0063] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact without interaction force or contact between two objects in contact with interaction force.

[0064] At present, new energy batteries are increasingly widely used in life and industry. New energy batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, electric transportation tools, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0065] As part of the inventive concept of the present disclosure, before describing the embodiments of the present disclosure, the reason why the battery monomer is difficult to process in the related art is analyzed, and the technical solution of the embodiments of the present disclosure is obtained through reasonable analysis.

[0066] In the related art, a mounting hole is formed on the top cover of the battery monomer, and the mounting hole is in communication with the inside of the shell assembly and the outside. The breather valve is connected to the top cover through the mounting hole. The thickness of the top cover is relatively thin, the space for installing the shielding piece is small, and the connection strength is weak. The valve wall of the breather valve may be welded through during connection to the top cover, and needs to be repeatedly debugged and installed to be stable, resulting in high processing difficulty of the battery monomer.

[0067] The present disclosure reduces the processing difficulty of the battery monomer by forming the mounting hole 5a on the insulating piece 5, the shielding piece 4 is located in the mounting hole 5a, and the mounting hole 5a formed by the pole 3 has a large size in the thickness direction, which relieves the repeated debugging during connection, thereby reducing the processing difficulty of the battery monomer.

[0068] The scheme of the embodiments of the present disclosure can be applied to, but is not limited to, a battery pack including a battery monomer or a battery unit, and can also be applied to a power consumption device including a battery monomer and a battery pack.

[0069] The present disclosure provides a power consumption device, which includes a device main body and a battery pack, and the battery pack is used to supply power to the device main body.

[0070] The power consumption device is a device that uses electric energy as energy and realizes corresponding functions by consuming electric energy. Exemplarily, the power consumption device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0071] The "device body" refers to the main structure that consumes electrical energy to perform its corresponding functions. For example, a power-consuming device could be a mobile phone, where the "device body" is the portion that performs functions such as communication, and power is supplied to this portion via a battery cell or battery pack. For example, a power-consuming device could be a car, where the "device body" is the portion that provides passengers with a seat and allows them to travel on the road, and power is supplied to this portion via a battery cell or battery pack.

[0072] A battery pack is a device that can output electrical energy. For example, a battery pack consisting of battery cells can output electrical energy. For example, a battery module consisting of battery cells can output electrical energy, and a battery pack consisting of battery modules can output electrical energy.

[0073] The electric device according to an embodiment of the present disclosure is described as a vehicle as an example.

[0074] The vehicle provided in one embodiment of the present disclosure may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery pack is provided inside the vehicle, and the battery pack may be provided at the bottom, head or tail of the vehicle. The battery pack may be used to power the vehicle. For example, the battery pack may serve as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller may be used to control the battery pack to power the motor. For example, the battery pack may be used for starting, navigating and operating power requirements of the vehicle during driving.

[0075] The present disclosure further provides a battery pack, which includes a box body and battery cells, wherein the battery cells are arranged inside the box body.

[0076] The number of battery cells can be multiple, and the multiple battery cells can be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells are connected both in series and in parallel. The multiple battery cells can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells is placed in a box. Of course, the multiple battery cells can first be connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules can then be connected in series, in parallel, or in a mixed connection to form a whole, and the whole formed by the multiple battery modules connected in series, in parallel, or in a mixed connection can be placed in a box. The battery pack can also include other structures. For example, the battery pack can also include a busbar component for achieving electrical connection between the multiple battery cells.

[0077] A battery cell refers to the basic unit that can realize the mutual conversion of chemical energy and electrical energy.

[0078] In the embodiment of the present disclosure, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0079] In the embodiments of the present disclosure, the battery cell can be a primary battery, also known as a primary cell, which refers to a battery that cannot be recharged after discharge.

[0080] In the embodiments of the present disclosure, the battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited thereto.

[0081] Exemplarily, the battery cells in the battery unit can not be combined into a battery module. Exemplarily, the battery cells in the battery unit can be combined into a battery module, and the battery unit includes a plurality of battery modules.

[0082] In some embodiments of the present disclosure, the battery pack can not only serve as an operating power source for the vehicle, but also serve as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0083] The present disclosure also provides a battery cell. Referring to FIGS. 1 to 6, the battery unit includes a shell assembly 1, a bare cell 2, a pole 3, an insulating piece 5, and a shielding piece 4. The bare cell 2 is arranged inside the shell assembly 1. The pole 3 is arranged on the shell assembly 1, and the pole 3 is electrically connected to the tab of the bare cell 2, and the number of the tabs is at least two. The insulating piece 5 is arranged on the shell assembly 1, and the insulating piece 5 surrounds the axial direction of the pole 3. The insulating piece 5 corresponding to at least one pole 3 is formed with a mounting hole 5a, and the mounting hole 5a communicates the inside of the shell assembly 1 with the outside. The shielding piece 4 covers the mounting hole 5a, and the shielding piece 4 is connected with the insulating piece 5. The shielding piece 4 has a gas permeable hole 4a, and the porosity of the gas permeable hole 4a is configured to allow the gas in the shell assembly 1 to flow outward, and to inhibit foreign matters outside the shell assembly 1 from entering the inside of the shell assembly 1.

[0084] The shell assembly 1 is permeable to gas, which means that the gas generated by the bare cell 2 during use is accumulated in the inside of the shell assembly 1 and flows to the outside through the mounting hole 5a.

[0085] The porosity refers to the percentage of the pore volume in the material to the total volume of the material in the natural state.

[0086] In the scheme of the embodiment of the present disclosure, the insulating piece 5 is formed with a mounting hole 5a, which communicates the inside of the shell assembly 1 with the outside. The shielding piece 4 covers the mounting hole 5a and is connected with the insulating piece 5. In the arrangement direction of the pole column 3 and the battery monomer, the size of the insulating piece 5 is relatively large, and in the process of connecting the shielding piece 4 with the insulating piece 5, the situation that the shielding piece 4 needs to be repeatedly adjusted is alleviated, thereby reducing the processing difficulty of the battery monomer. Furthermore, the shielding piece 4 is formed with a breathable hole 4a, which can exhaust the gas in the shell assembly 1 and block the sundries from entering the inside of the shell assembly 1. The structure of the breathable hole 4a does not need to be provided with a complex mechanical structure, thereby realizing the one-way flow of the mounting hole 5a, and the shielding piece 4 has a simple structure and a relatively low cost.

[0087] In an embodiment, the shielding piece 4 comprises a molecular sieve.

[0088] Illustratively, the molecular sieve is a CO2 molecular sieve or a H2 molecular sieve.

[0089] Illustratively, the type of the molecular sieve is porous stainless steel, porous ceramic, high polymer plastic or high polymer fiber.

[0090] Illustratively, the shape of the molecular sieve is adapted to the shape of the mounting hole 5a.

[0091] Illustratively, the molecular sieve is installed in the mounting hole 5a through interference fit.

[0092] Illustratively, the molecular sieve is connected with the insulating piece 5 through gluing.

[0093] In the scheme of the embodiment of the present disclosure, the shielding piece 4 comprises a molecular sieve. The molecular sieve has good water absorption, which can absorb the moisture from the outside, thereby alleviating the situation that the water vapor enters the battery monomer. Furthermore, the thermal stability of the molecular sieve is good, and in the case that a large amount of heat is generated in the working process of the battery monomer, the molecular sieve can remain stable and has a high service life.

[0094] In an embodiment, the porosity of the molecular sieve ranges from 20% to 90%, and / or the size of the molecular sieve ranges from 1 mm to 2 mm in the arrangement direction of the pole column 3 and the bare battery core 2.

[0095] Illustratively, the porosity of the molecular sieve is 20%, 30%, 40%, 45%, 50%, 55%, 60%, 70%, 80% or 90%.

[0096] It can be understood that the porosity of the molecular sieve can be obtained by drainage method or gas displacement method test.

[0097] Illustratively, the size of the molecular sieve is 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm or 2.0 mm in the arrangement direction of the pole column 3 and the bare battery core 2.

[0098] It can be understood that the size of the molecular sieve can be measured by a vernier caliper under normal temperature and pressure before the first charging of the battery monomer.

[0099] In the scheme of the embodiments of the present disclosure, the porosity of the molecular sieve and the size of the molecular sieve are within a suitable range, and the molecular sieve can balance the rapid discharge of the gas in the battery monomer and the better blocking of the foreign matters from the outside into the inside of the shell assembly 1.

[0100] In an embodiment, the shielding piece 4 comprises a gas permeable film.

[0101] Illustratively, the type of the gas permeable film is a polyolefin gas permeable film or a polytetrafluoroethylene gas permeable film.

[0102] Illustratively, the gas permeable film is connected to the insulating piece 5 by gluing.

[0103] Illustratively, the shielding piece 4 further comprises a mounting block, the gas permeable film is connected to the surface of the mounting block, the mounting block is formed with a plurality of through holes, and the mounting block is connected to the mounting hole 5a by interference fit or hot melting.

[0104] In the scheme of the embodiments of the present disclosure, the gas permeable film has high gas permeability, and the gas in the battery monomer can be more smoothly discharged to the outside, and the exhaust efficiency is high. Furthermore, the gas permeable film has good waterproof ability, and can better block the external moisture from entering the battery monomer.

[0105] In an embodiment, referring to FIG. 3, the porosity of the gas permeable film ranges from 20% to 75%, and / or, along the arrangement direction of the pole 3 and the bare battery core 2, the size of the gas permeable film ranges from 0.2 mm to 1.6 mm.

[0106] Illustratively, the porosity of the gas permeable film is 20%, 30%, 40%, 45%, 50%, 55%, 65%, 70% or 75%.

[0107] It can be understood that the porosity of the gas permeable film can be measured by osmotic pressure or weighing method.

[0108] Illustratively, as shown in FIG. 3, along the arrangement direction of the pole 3 and the bare battery core 2, the size of the gas permeable film is shown as size D1.

[0109] Illustratively, along the arrangement direction of the pole 3 and the bare battery core 2, the size of the gas permeable film is 0.2 mm, 0.6 mm, 1.0 mm, 1.2 mm, 1.4 mm or 1.6 mm.

[0110] It can be understood that the size of the gas permeable film can be measured by a vernier caliper under normal temperature and pressure before the first charging of the battery monomer.

[0111] In the disclosed embodiment, the porosity and thickness of the breathable membrane are within an appropriate range. The breathable membrane can ensure that the gas in the battery cell can be quickly discharged and effectively prevent external debris from entering the interior of the housing assembly 1.

[0112] In one embodiment, referring to FIG. 1 , the insulating members 5 corresponding to at least two poles 3 are formed with ventilation holes 4 a.

[0113] Exemplarily, there are two poles 3, one of which is electrically connected to the positive electrode ear of the bare battery cell 2, and the other is electrically connected to the negative electrode ear of the bare battery cell 2, and the insulating parts 5 corresponding to the two poles 3 are both formed with mounting holes 5a.

[0114] In the disclosed embodiment, the insulating member 5 corresponding to at least two poles 3 is formed with mounting holes 5a. The battery cell can adapt to the situation of high gas production efficiency, and the multiple mounting holes 5a can quickly discharge the gas inside the housing assembly 1 to the outside.

[0115] It is understood that the embodiment of the present disclosure is not limited to the insulating members 5 corresponding to at least two poles 3 being formed with mounting holes 5a. For example, the insulating member 5 corresponding to only one pole 3 is formed with a mounting hole 5a.

[0116] In one embodiment, referring to FIG. 2 , a single insulating member 5 is formed with at least two mounting holes 5 a , and the plurality of mounting holes 5 a are spaced apart along the circumference of the insulating member 5 , and each mounting hole 5 a is correspondingly provided with a shielding member 4 .

[0117] Exemplarily, the number of the mounting holes 5 a is four, and the four mounting holes 5 a are evenly distributed in the circumference of the insulating member 5 .

[0118] In the disclosed embodiment, a single insulating member 5 is formed with at least two mounting holes 5a, and the plurality of mounting holes 5a are arranged at intervals along the circumference of the insulating member 5. The arrangement of the plurality of mounting holes 5a can fully utilize the circumferential area of ​​the insulating member 5, thereby providing higher exhaust efficiency.

[0119] It is understood that the embodiment of the present disclosure is not limited to the single insulating member 5 being formed with at least two mounting holes 5a. For example, the number of mounting holes 5a formed on the single insulating member 5 is one.

[0120] In one embodiment, referring to FIG. 3 , when projected along the arrangement direction of the poles 3 and the bare cells 2 , the ratio of the width of the mounting hole 5 a to the width of the insulating member 5 is in the range of 0.4 to 0.6.

[0121] Illustratively, the ratio of the width of the mounting hole 5 a to the width of the insulating member 5 is 0.40, 0.42, 0.44, 0.46, 0.48, 0.52, 0.56, 0.58 or 0.60.

[0122] Exemplarily, as shown in FIG. 3, the width of the mounting hole 5a is shown as dimension D2, and the width of the insulating piece 5 is shown as dimension D3.

[0123] It can be understood that the width of the mounting hole 5a can be measured by a vernier caliper under normal temperature and pressure before the first charging of the battery monomer.

[0124] It can be understood that the width of the insulating piece 5 can be measured by a vernier caliper under normal temperature and pressure before the first charging of the battery monomer.

[0125] In the embodiment of the present disclosure, the ratio between the width of the mounting hole 5a and the width of the insulating piece 5 is within a suitable range, which can take into account the exhaust efficiency of the mounting hole 5a and the strength of the insulating piece 5 itself, so that the strength of the insulating piece 5 is as high as possible.

[0126] In an embodiment, the pore size of the air permeable hole 4a ranges from 400 nm to 400 μm.

[0127] Exemplarily, the pore size of the air permeable hole 4a is 400 nm, 600 nm, 800 nm, 1 μm, 100 μm, 200 μm, 300 μm, or 400 μm.

[0128] It can be understood that the pore size of the air permeable hole 4a can be measured by observation under an electron microscope and obtained by indirect measurement methods such as bubble point pressure method or pressure contribution method.

[0129] In the embodiment of the present disclosure, the pore size of the air permeable hole 4a is within a suitable range, so that the shielding piece 4 can take into account that the gas inside the shell assembly 1 can be quickly discharged to the outside and the shielding piece 4 can better block the external impurities from entering the inside of the shell assembly 1 through the mounting hole 5a.

[0130] In an embodiment, referring to FIG. 3, the shielding piece 4 is located at one end of the mounting hole 5a away from the battery monomer.

[0131] In the embodiment of the present disclosure, the shielding piece 4 is located at one end of the mounting hole 5a away from the battery monomer. The shielding piece 4 is as far away from the bare cell 2 as possible, which alleviates the corrosion of the shielding piece 4 caused by the contact of the electrolyte during the working process.

[0132] It can be understood that the embodiment of the present disclosure is not limited to the shielding piece 4 being located at one end of the mounting hole 5a away from the battery monomer. Exemplarily, the shielding piece 4 is located at one side of the mounting hole 5a towards the battery monomer.

[0133] In one embodiment, please refer to Figure 5, the surface of the shell component 1 facing the bare battery cell 2 is the first surface 1a, and the surface of the shielding member 4 facing the bare battery cell 2 is the second surface 1b. Along the arrangement direction of the pole 3 and the bare battery cell 2, the height difference between the second surface 1b and the first surface 1a ranges from 2.5mm to 3.5mm.

[0134] Exemplarily, the housing assembly 1 includes a top cover and a box body connected to each other, the bare cell 2 is located in the area jointly enclosed by the top cover and the box body, the top cover is arranged on the box body, the pole 3 is arranged on the top cover, and the first surface 1a is formed on the side of the top cover facing the bare cell 2.

[0135] Illustratively, along the arrangement direction of the poles 3 and the bare cells 2 , the height difference between the second surface 1 b and the first surface 1 a is 2.5 mm, 2.7 mm, 2.9 mm, 3.1 mm, 3.3 mm or 3.5 mm.

[0136] Exemplarily, as shown in FIG. 5 , the height difference between the second surface 1 b and the first surface 1 a is shown as dimension D4 .

[0137] It is understandable that the height difference between the second surface 1b and the first surface 1a along the arrangement direction of the pole 3 and the bare cell 2 can be measured by a vernier caliper at normal temperature and pressure before the battery cell is charged for the first time.

[0138] In the embodiment of the present disclosure, the height difference between the first surface 1 a and the second surface 1 b is within a suitable range to ensure both relief of electrolyte contact with the shielding member 4 and strength of connection between the shielding member 4 and the insulating member 5 .

[0139] In one embodiment, referring to FIG. 3 , the insulating member 5 is at least partially located in the mounting hole 5 a.

[0140] In the disclosed embodiment, the shielding member 4 is at least partially located in the mounting hole 5a, the connection strength between the shielding member 4 and the pole 3 is high, and the shielding member 4 does not need to be connected to the hole wall of the mounting hole 5a with additional connecting parts, which further simplifies the installation process.

[0141] It is understood that the present disclosure is not limited to the shielding member 4 being at least partially located in the mounting hole 5a. Exemplarily, the shielding member 4 is connected to the end surface of the insulating member 5 facing away from the battery cell, and the mounting hole 5a is located between the shielding member 4 and the battery cell.

[0142] In one embodiment, please refer to Figure 4. Projected along the arrangement direction of the pole 3 and the bare battery cell 2, the projected area of ​​the pole 3 is a rectangle, and the projected area of ​​the insulating member 5 is a square ring surrounding the projected area of ​​the pole 3. Along the length direction of the mounting hole 5a, the ratio between the size of the mounting hole 5a and the size of the insulating member 5 is in the range of 1 / 3 to 2 / 3.

[0143] Exemplarily, the ratio between the size of the mounting hole 5a and the size of the insulating piece 5 along the length direction of the mounting hole 5a is 1 / 3, 1 / 2 or 2 / 3.

[0144] It can be understood that the size of the mounting hole 5a along the length direction of the mounting hole 5a can be obtained by measuring with a ruler under normal temperature and pressure before the first charging of the battery monomer.

[0145] It can be understood that the size of the insulating piece 5 along the length direction of the mounting hole 5a can be obtained by measuring with a ruler under normal temperature and pressure before the first charging of the battery monomer.

[0146] Exemplarily, as shown in FIG. 4, the size of the insulating piece 5 along the length direction of the mounting hole 5a is shown as size D5, and the size of the mounting hole 5a is shown as size D6.

[0147] In the embodiment of the present disclosure, the ratio between the size of the mounting hole 5a and the size of the insulating piece 5 along the length direction of the mounting hole 5a is within a suitable range, taking into account the exhaust efficiency of the mounting hole 5a and the strength of the insulating piece 5 itself, so that the strength of the insulating piece 5 is as high as possible.

[0148] In an embodiment, referring to FIGS. 1-6, the battery cell includes a shell assembly 1, a bare cell 2, a pole 3, an insulating piece 5, and a shielding piece 4. The bare cell 2 is disposed inside the shell assembly 1. The pole 3 is disposed on the shell assembly 1, and the pole 3 is electrically connected to the tabs of the bare cell 2, the number of the tabs being at least two. The insulating piece 5 is disposed on the shell assembly 1, and the insulating piece 5 surrounds the pole 3 in the axial direction. At least one insulating piece 5 corresponding to the pole 3 is formed with a mounting hole 5a, and the mounting hole 5a is in communication with the inside of the shell assembly 1 and the outside. The shielding piece 4 is connected to the insulating piece 5, and the shielding piece 4 has a gas-permeable hole 4a, and the porosity of the gas-permeable hole 4a is configured to allow the gas in the shell assembly 1 to be discharged outward, and to inhibit foreign matter from the outside of the shell assembly 1 from entering the inside of the shell assembly 1. The shielding piece 4 is a molecular sieve or a gas-permeable film. The porosity of the molecular sieve ranges from 20% to 90%, and / or the size of the molecular sieve along the arrangement direction of the pole 3 and the bare cell 2 ranges from 1 mm to 2 mm. The porosity of the gas-permeable film ranges from 20% to 75%, and / or the size of the gas-permeable film along the arrangement direction of the pole 3 and the bare cell 2 ranges from 0.2 mm to 1.6 mm. At least two insulating pieces 5 corresponding to the poles 3 are each formed with a mounting hole 5a. A single insulating piece 5 is formed with at least two mounting holes 5a, and the mounting holes 5a are arranged at intervals along the circumferential direction of the insulating piece 5, and each mounting hole 5a is provided with a shielding piece 4. The ratio between the width of the mounting hole 5a and the width of the insulating piece 5 along the arrangement direction of the pole 3 and the bare cell 2 ranges from 0.4 to 0.6. The pore size of the gas-permeable hole 4a ranges from 400 nm to 400 μm. The shielding piece 4 is located at the end of the mounting hole 5a away from the battery cell. The insulating piece 5 is at least partially located in the mounting hole 5a. The surface of the shell assembly 1 facing the bare cell 2 is a first surface la, the surface of the shielding piece 4 facing the bare cell 2 is a second surface lb, and the height difference between the second surface lb and the first surface la along the arrangement direction of the pole 3 and the bare cell 2 ranges from 2.5 mm to 3.5 mm. The projection area of the pole 3 along the arrangement direction of the pole 3 and the bare cell 2 is a rectangle, the projection area of the insulating piece 5 is a square ring surrounding the projection area of the pole 3, and the ratio between the size of the mounting hole 5a and the size of the insulating piece 5 along the length direction of the mounting hole 5a ranges from 1 / 3 to 2 / 3.

[0149] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure is described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced equivalently; 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 disclosure, and they should be covered in the scope of the specification of the present disclosure. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope.

Claims

1. A battery cell, comprising: Housing assembly; A bare battery cell is disposed inside the housing assembly; A pole, provided in the housing assembly, the pole being electrically connected to the tab of the bare cell, and the number of the poles being at least two; an insulating member disposed in the housing assembly, the insulating member surrounding the circumference of the pole, the insulating member corresponding to at least one pole being formed with a mounting hole, the mounting hole communicating with the interior of the housing assembly and the outside; A shielding member covers the mounting hole, the shielding member is connected to the insulating member, and the shielding member has an air vent. The porosity of the air vent is configured such that the gas in the shell assembly can be discharged outward and foreign matter outside the shell assembly can be prevented from entering the shell assembly.

2. The battery cell according to claim 1, wherein: The shielding member includes a molecular sieve.

3. The battery cell according to claim 2, wherein: The porosity of the molecular sieve is in the range of 20% to 90%, and / or, along the arrangement direction of the pole and the bare cell, the size of the molecular sieve is in the range of 1 mm to 2 mm.

4. The battery cell according to claim 1, wherein: The shielding member includes a breathable membrane.

5. The battery cell according to claim 4, wherein: The porosity of the breathable membrane is in the range of 20% to 75%, and / or, along the arrangement direction of the poles and the bare cells, the size of the breathable membrane is in the range of 0.2 mm to 1.6 mm.

6. The battery cell according to any one of claims 1 to 5, wherein: The insulating members corresponding to at least two of the poles are each formed with the mounting hole.

7. The battery cell according to any one of claims 1 to 6, wherein: A single insulating member is formed with at least two mounting holes, and a plurality of mounting holes are arranged at intervals along the circumference of the insulating member, and each mounting hole is correspondingly provided with the shielding member.

8. The battery cell according to any one of claims 1 to 7, wherein: Projected along the arrangement direction of the poles and the bare cells, the ratio of the width of the mounting hole to the width of the insulating member is in the range of 0.4 to 0.

6.

9. The battery cell according to any one of claims 1 to 8, wherein: The pore diameter of the air-permeable pores ranges from 400 nm to 400 μm.

10. The battery cell according to any one of claims 1 to 9, wherein: The shielding member is located at an end of the mounting hole away from the battery cell.

11. The battery cell according to claim 10, wherein: The surface of the shell assembly facing the bare battery cell is the first surface, and the surface of the shielding member facing the bare battery cell is the second surface. Along the arrangement direction of the pole and the bare battery cell, the height difference between the second surface and the first surface ranges from 2.5mm to 3.5mm.

12. The battery cell according to any one of claims 1 to 11, wherein: The shielding member is at least partially located in the mounting hole.

13. The battery cell according to any one of claims 1 to 12, wherein: Projected along the arrangement direction of the pole and the bare cell, the projected area of ​​the pole is a rectangle, the projected area of ​​the insulating member is a square ring surrounding the projected area of ​​the pole, and along the length direction of the mounting hole, the ratio between the size of the mounting hole and the size of the insulating member ranges from 1 / 3 to 2 / 3.

14. A battery pack comprising: Box; At least one battery cell according to any one of claims 1 to 13 is disposed inside the box.

15. An electrical device comprising: Device body; The battery pack according to claim 14, used to supply power to a device body.

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