Battery monomer, battery device and electric equipment

Abstract

The invention provides a battery monomer, a battery device and electric equipment, and the battery monomer comprises a shell which comprises a first wall, and the first wall is provided with a through hole; the insulating part is arranged in the shell, the insulating part is provided with a containing cavity and an opening communicated with the containing cavity, and the opening faces the first wall; the electrode assembly is arranged in the accommodating cavity; the first flow guide part is located between the first wall and the electrode assembly, the orthographic projection of the first flow guide part on the first wall covers the through hole, and the first flow guide part crosses the opening and is connected to the insulating part. According to the battery monomer, the battery device and the electric equipment provided by the invention, the reliability of the battery monomer can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] The battery cells in the related art have the phenomenon of lithium deposition on the pole pieces, which affects the reliability of the battery cells. Summary of the invention

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

[0005] In a first aspect, the present application provides a battery cell, comprising: a shell, an insulating member, an electrode assembly, and a first flow guide, wherein the shell comprises a first wall, and a through hole is provided on the first wall. The insulating member is disposed in the shell, and the insulating member has a receiving cavity and an opening connected to the receiving cavity, and the opening is disposed toward the first wall. The electrode assembly is disposed in the receiving cavity, and the first flow guide is located between the first wall and the electrode assembly, and the orthographic projection of the first flow guide on the first wall covers the through hole, and the first flow guide is arranged across the opening and connected to the insulating member.

[0006] A battery cell provided by an embodiment of the present application can inject electrolyte into the battery cell through a through hole by setting a through hole on the first wall. A first flow guide is set, and it is located between the first wall and the electrode assembly. The orthographic projection of the first flow guide on the first wall covers the through hole. The first flow guide is arranged across the opening and connected to the insulating member, so that the electrolyte and other fluids entering through the through hole can be guided to the outside of the insulating member away from the accommodating cavity through the first flow guide, and flow along the outer wall surface of the insulating member under the action of gravity to the end of the shell opposite to the first wall. The electrolyte can crawl under the action of capillary action, and gradually infiltrate from bottom to top as the electrolyte accumulates, avoiding the occurrence of liquid sealing when the electrolyte infiltrates from the surrounding to the middle area, so that each part of the electrode of the electrode assembly is evenly infiltrated, improving the black spots of the battery electrode, thereby avoiding the lithium precipitation phenomenon during the use of the battery cell, and improving the reliability of the battery cell.

[0007] In some embodiments, the insulating member includes a bottom wall and a side wall. The side wall is arranged around the bottom wall and encloses a receiving cavity. The bottom wall is arranged opposite to the opening. The first flow guide is connected to the side wall. A channel is arranged on at least one of the bottom wall and the side wall.

[0008] The insulating member adopts the above-mentioned structural form, which can isolate the electrode assembly from the shell, prevent the electrode assembly from contacting the shell and causing a short circuit, and ensure the reliability of the battery cell. In addition, the first flow guide is connected to the side wall, which can ensure that the relative position of the first flow guide and the through hole is fixed, which is beneficial to the reception and diversion of the electrolyte entering the through hole. At the same time, the above-mentioned setting can reduce the setting size of the first flow guide, reduce the cost and the occupied area of ​​the first flow guide inside the shell, and ensure the energy density requirements of the battery cell. The setting of the channel is conducive to the electrolyte flowing from the outer wall of the insulating member to the end of the shell opposite to the first wall to enter the insulating member through the channel and infiltrate the electrode assembly from bottom to top.

[0009] In some embodiments, the side wall includes a first wall surface and a second wall surface that are oppositely disposed. The area of ​​the first wall surface is greater than the area of ​​the second wall surface. The first flow guide is connected to the first wall surface.

[0010] By connecting the first flow guide to the first wall, the first flow guide and the insulating member are conveniently connected to each other, and interference between the first flow guide and other components of the battery cell such as the insulating plate can be avoided. In addition, the electrolyte entering the through hole can be guided to the first wall side of the insulating member through the first flow guide, which is beneficial to the infiltration of the electrolyte.

[0011] In some embodiments, the first flow guide is an integral structure as a whole, one end of the first flow guide is connected to one of the oppositely disposed first walls, and the other end of the first flow guide is connected to the other of the oppositely disposed first walls.

[0012] By making the first flow guide an integrated structure, the first flow guide is arranged in a non-disconnected manner in the drainage direction of the electrolyte, thereby ensuring the guiding ability and carrying capacity of the electrolyte and reducing the probability of the electrode liquid entering through the opening and flowing from top to bottom into the electrode assembly.

[0013] In some embodiments, the first flow guide includes a first sub-flow guide portion and a second sub-flow guide portion. The first sub-flow guide portion and the second sub-flow guide portion are arranged opposite to each other and connected at one end facing each other. The first sub-flow guide portion and the second sub-flow guide portion are connected to the insulating member at one end facing away from each other.

[0014] Through the above arrangement, the electrolyte and other fluids entering through the through hole can also be guided to the outside of the insulating member away from the accommodating cavity through the first guide member, and flow along the outer wall of the insulating member under the action of gravity to the end of the shell opposite to the first wall, and gradually infiltrate from bottom to top as the electrolyte accumulates, avoiding the liquid sealing phenomenon when the electrolyte infiltrates from the surrounding to the middle area. In addition, the above arrangement is also conducive to the connection and synchronous molding of the first guide member and the insulating member, reducing the difficulty of molding.

[0015] In some embodiments, the first sub-guiding portion has a first guiding groove, the second sub-guiding portion has a second guiding groove, one end of the second sub-guiding portion is accommodated in the first guiding groove, and the first guiding groove and the second guiding groove are connected.

[0016] The split overlap form is conducive to the molding of the first flow guide member and the insulating member, and can ensure the guidance requirements for the electrolyte.

[0017] In some implementations, the battery cell further includes a second flow guide, which is disposed on an outer side of the insulating member away from the accommodating cavity, and the second flow guide is connected to the first flow guide.

[0018] By providing a second guide member, the electrolyte guided by the first guide member to the outside of the insulating member away from the accommodating cavity can be directed again so that it can quickly flow along the stack into the bottom of the shell. The electrolyte can crawl under the capillary action, and the infiltration of the electrode assembly can be achieved from bottom to top, avoiding the liquid sealing phenomenon caused by the electrolyte infiltrating from the surroundings to the middle.

[0019] In some embodiments, the second guide member includes a third guide groove disposed outside the insulating member.

[0020] By making the second flow guide member include the third flow guide groove, the molding of the second flow guide member is facilitated, and the third flow guide groove is formed by removing material without occupying additional internal space of the shell, thereby ensuring the size requirements of the electrode assembly and further ensuring the energy density requirements of the battery cell.

[0021] In some embodiments, the first flow guide has a first port and a second port, and the first port and the second port are respectively connected to the second flow guide.

[0022] The setting of the first port and the second port and the respective connection to the second guide member can guide the electrolyte from both sides to the bottom of the shell, which can not only ensure the injection efficiency of the electrolyte, but also reduce the risk of the electrolyte accumulating and overflowing in the first guide member and infiltrating the electrolyte from top to bottom on the side where the through hole is located.

[0023] In some embodiments, the second flow guides are arranged in pairs, and the second flow guides arranged in pairs are spaced apart from each other and symmetrically distributed on the insulating member.

[0024] The above arrangement facilitates guiding the electrolyte from both sides to the bottom of the shell, which can ensure the injection efficiency of the electrolyte and reduce the risk of the electrolyte accumulating and overflowing in the first guide member and infiltrating the electrolyte from top to bottom on the side where the through hole is located.

[0025] In some embodiments, the second guide member extends along a straight line.

[0026] By extending the second guide member along a straight line, the resistance when draining the electrolyte can be reduced, ensuring that the electrolyte can be quickly guided to the bottom of the shell and then climb from bottom to top by capillary action.

[0027] In some embodiments, the second guide member is extended along a fold line trajectory.

[0028] Through the above arrangement, when the first or second opening of the first flow guide member is staggered with the outflow opening of the second flow guide member, they can be connected by extending along a folded line trajectory to ensure the directional flow guidance requirements for the electrolyte.

[0029] In some embodiments, the second flow guide member includes a main fluid and a plurality of branch fluids, the main fluid is connected to the first flow guide member, and the branch fluids are spaced apart from each other and are respectively connected to the main fluid.

[0030] The second flow guide member adopts the combination of the main flow guide and the secondary flow guide, which is beneficial to guide the electrolyte to different positions at the bottom of the shell and ensure the uniformity of the electrolyte infiltration.

[0031] In some embodiments, a plurality of diverter fluids are spaced apart and distributed in the first direction, and one of the diverter fluids is located at the center of the insulating element in the first direction.

[0032] Since the electrode assembly corresponding to the center position of the insulating member has a high probability of having a liquid seal, by locating one of the diverting fluids at the center position of the insulating member in the first direction, it is beneficial for the electrolyte to climb at the center position of the insulating member corresponding to the electrode assembly, thereby reducing the probability of liquid seal. The diverting fluids are arranged on both sides of the center position to ensure the uniformity of the electrode assembly from bottom to top.

[0033] In some embodiments, the first flow guide and the insulating member are an integral structure.

[0034] Through the above arrangement, the connection strength between the first flow guide member and the insulating member can be ensured.

[0035] In a second aspect, the present application provides a battery device, comprising the above-mentioned battery cell.

[0036] In a third aspect, the present application provides an electrical device, including the above-mentioned battery device.

[0037] 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

[0038] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application; Figure 2 is a schematic structural diagram of a battery device provided in one embodiment of the present application; Figure 3 is an exploded schematic diagram of a battery cell provided in an embodiment of the application; Figure 4 is a schematic diagram of an expansion of an insulating member and a first flow guide member provided in an embodiment of the present application; Figure 5 This is a diagram showing the use status of an insulating member and a first flow guide member provided by an embodiment of the present application; Figure 6 is a schematic diagram of an expansion of an insulating member and a first flow guide member provided in another embodiment of the present application; Figure 7 is a diagram showing a usage state of an insulating member and a first flow guide member provided by another embodiment of the present application; Figure 8 is a schematic diagram of an expansion of an insulating member and a first flow guide member provided in another embodiment of the present application; Fig. 9 is a diagram showing a usage state of an insulating member and a first flow guide member provided by another embodiment of the present application; Fig.10 is a schematic diagram of an expansion of an insulating member and a first flow guide member provided in yet another embodiment of the present application; Fig.11 is a schematic diagram of an expansion of an insulating member and a first flow guide member provided in another embodiment of the present application; Fig.12 It is a schematic diagram of the expansion of the insulating member and the first flow guide member provided in yet another embodiment of the present application.

[0039] Marking Description: 1. Vehicle; 100. Battery device; 200. Battery module; 300. Controller; 400. Motor; 10. Box body; 11. First box body portion; 12. Second box body portion; 20, battery cell; 20a, housing; 201, first wall; 202, through hole; 21. Shell; 22. Electrode assembly; 23. cover plate; 231. electrode terminal; 24, insulating member; 241, bottom wall; 242, side wall; 2421, first wall surface; 2422, second wall surface; 243, accommodating cavity; 244, opening; 255, passage; 25, first flow guide; 25a, first port; 25b, second port; 251, first sub-guiding portion; 2511, first groove bottom wall; 2512, first groove side wall; 2513, first guide groove; 252, second sub-guiding portion; 2521, second groove bottom wall; 2522, second groove side wall; 2523, second guide groove; 26. Second flow guide; 261. Main flow; 262. Sub-flow guide; X, width direction; Y, thickness direction; Z, height direction. DETAILED DESCRIPTION

[0040] 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.

[0041] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0042] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and 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.

[0043] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number 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.

[0044] 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 ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0047] With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding. The battery cells in the related technology have the phenomenon of lithium plating on the pole pieces, which affects the reliability of the battery cells. Research has found that the battery cells in the related technology, by setting a cavity on the insulating part, the cavity is used to store the electrolyte when the electrolyte is injected, so that the electrode assembly is infiltrated from multiple directions, which improves the injection efficiency and improves the infiltration effect. However, this setting method causes the electrolyte to infiltrate from all sides to the middle during injection, which will lead to liquid sealing, and then uneven lithium embedding in the middle. Lithium plating occurs in the middle of the pole piece during the cycle, affecting the reliability of the battery cell.

[0048] In order to solve the above technical problems, the infiltration direction of the electrolyte can be changed so that the electrolyte infiltrates from bottom to top in a directional manner, avoiding the liquid sealing phenomenon when the electrolyte infiltrates from the surroundings to the middle area, thereby ensuring uniform infiltration of all parts of the pole piece, improving the black spots of the battery pole piece, and improving the reliability of the battery cell. To this end, an embodiment of the present application provides a battery cell, including a shell, an insulating member, an electrode assembly and a first flow guide member, the shell including a first wall, and the first wall is provided with a through hole. The insulating member is arranged in the shell, and the insulating member has a receiving cavity and an opening connected to the receiving cavity, the opening is arranged toward the first wall, and the electrode assembly is arranged in the receiving cavity. By locating the first flow guide between the first wall and the electrode assembly, the orthographic projection of the first flow guide on the first wall covers the through hole, and the first flow guide is arranged across the opening and connected to the insulating member, so that the electrolyte and other fluids entering through the through hole can be guided by the first flow guide to the outside of the insulating member away from the accommodating cavity, and flow along the outer wall surface of the insulating member under the action of gravity to the end of the shell opposite to the first wall. The electrolyte can crawl under the action of capillary action, and gradually infiltrate from bottom to top as the electrolyte accumulates, avoiding the liquid sealing phenomenon when the electrolyte infiltrates from the surrounding to the middle area, so that all parts of the electrode are evenly infiltrated, improving the black spots of the battery electrode, and then avoiding the lithium precipitation phenomenon during the use of the battery cell, thereby improving the reliability of the battery cell.

[0049] The technical solution described in the embodiments of the present application is applicable to a battery device, an electrical device using a battery device, or an energy storage device.

[0050] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0051] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the electrical equipment described above, but can also be applied to all battery devices including a box and electrical equipment and energy storage equipment using the battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0052] For example, Figure 1As shown, the vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 400, a controller 300 and a battery device 100 can be arranged inside the vehicle 1, and the controller 300 is used to control the battery device 100 to power the motor 400. For example, a battery device 100 can be arranged at the bottom, front or rear of the vehicle 1. The battery device 100 can be used to power the vehicle 1. For example, the battery device 100 can be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements of the vehicle 1 during startup, navigation and operation. In another embodiment of the present application, the battery device 100 can not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0053] It should be understood that the technical solution described in the embodiment of the present application is not limited to being applicable to the above-mentioned vehicle 1, but can also be applicable to energy storage devices.

[0054] like Figure 2 As shown, in order to meet different power usage requirements, the battery device 100 includes a box body 10 and a battery cell 20. The box body 10 has a receiving cavity, and a plurality of battery cells 20 are disposed in the receiving cavity.

[0055] The box 10 can be a simple three-dimensional structure such as a single cuboid, a cylinder, or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres, which is not limited in the present embodiment. The box 10 can be made of alloy materials such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber plus epoxy resin, which is not limited in the present embodiment.

[0056] The box 10 is used to accommodate the battery cell 20, and the box 10 can be a variety of structures. In some embodiments, the box 10 may include a first box portion 11 and a second box portion 12, the first box portion 11 and the second box portion 12 cover each other, and the first box portion 11 and the second box portion 12 jointly define a receiving cavity for accommodating the battery cell 20. The second box portion 12 may be a hollow structure with one end open, the first box portion 11 is a plate-like structure, and the first box portion 11 covers the open side of the second box portion 12 to form a box 10 with a receiving cavity; the first box portion 11 and the second box portion 12 may also be a hollow structure with one side open, and the opening 244 side of the first box portion 11 covers the open side of the second box portion 12 to form a box 10 with a receiving cavity. Of course, the first box portion 11 and the second box portion 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0057] In order to improve the sealing performance after the first box body 11 and the second box body 12 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 11 and the second box body 12 .

[0058] Assuming that the first box body portion 11 covers the top of the second box body portion 12 , the first box body portion 11 can also be referred to as an upper box cover, and the second box body portion 12 can also be referred to as a lower box body 10 .

[0059] In the battery device 100, there can be multiple battery cells 20. If there are multiple battery cells 20, the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, it is also possible that multiple battery cells 20 are first connected in series, in parallel, or in mixed connection to form a battery module 200, and then the multiple battery modules 200 are connected in series, in parallel, or in mixed connection to form a whole, and then accommodated in the box 10.

[0060] The multiple battery cells 20 in the battery module 200 can be electrically connected via adapters to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 20 in the battery module 200 .

[0061] In the embodiment of the present application, the battery cell 20 may be a secondary battery. A secondary battery refers to a battery cell 20 that can be continuously used by activating active materials by charging after the battery cell 20 is discharged.

[0062] The battery cell 20 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 storage battery, etc., which is not limited in the embodiments of the present application.

[0063] like Figures 3 to 5 As shown, a battery cell 20 provided in one embodiment of the present application includes a housing 20a, an insulating member 24, an electrode assembly 22, and a first flow guide 25. The housing 20a includes a first wall 201, and a through hole 202 is provided on the first wall 201. The insulating member 24 is disposed in the housing 20a. The insulating member 24 has a receiving cavity 243 and an opening 244 communicating with the receiving cavity 243, and the opening 244 is disposed toward the first wall 201. The electrode assembly 22 is disposed in the receiving cavity 243, and the first flow guide 25 is located between the first wall 201 and the electrode assembly 22. The orthographic projection of the first flow guide 25 on the first wall 201 covers the through hole 202, and the first flow guide 25 is arranged across the opening 244 and connected to the insulating member 24.

[0064] The outer shell 20a included in the battery cell 20 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite outer shell 20a) or an aluminum-plastic film. In some embodiments, the outer shell 20a plays a role in protecting the electrode assembly 22, and an insulating member 24 is also included between the outer shell 20a and the electrode assembly 22. The insulating member 24 is used to encapsulate the electrode assembly 22 and the electrolyte. Specifically, the insulating member 24 can be a bag-shaped insulating member or an aluminum-plastic film. When the outer shell 20a is a sealed structure, it is used to encapsulate components such as the electrode assembly 22 and the electrolyte.

[0065] As an example, the battery cell 20 can 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, etc. There is no special limitation in the present application.

[0066] The housing 20a of the battery cell 20 may include a shell 21 and a cover plate 23. The shell 21 has a cavity and an opening communicating with the cavity. The cover plate 23 may be disposed at the opening of the shell 21 and connected to the shell 21. The shell 21 or the cover plate 23 includes a first wall 201. Optionally, the cover plate 23 includes a first wall 201.

[0067] The electrode assembly 22 includes a positive electrode, a negative electrode, and a separator, and the separator is disposed between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell 20, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0068] The electrode assembly 22 may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0069] In some embodiments, the electrode assembly 22 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0070] In some embodiments, the electrode assembly 22 is a laminate structure.

[0071] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0072] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0073] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0074] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0075] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0076] In some embodiments, the shape of the electrode assembly 22 can be cylindrical, flat, or polygonal.

[0077] In some embodiments, the electrode assembly 22 is provided with tabs, which can conduct current from the electrode assembly 22. The tabs include a positive tab and a negative tab.

[0078] The insulating member 24 may be coated on the outside of the electrode assembly 22, and is mainly used to isolate the electrode assembly 22 from the housing 21, to prevent the electrode assembly 22 from contacting the housing 21 and causing a short circuit, thereby ensuring the reliability of the battery cell 20. The insulating member 24 may also prevent the electrode assembly 22 from being scratched, and to prevent the housing 21 from scratching the surface of the electrode assembly 22 during assembly or use.

[0079] The insulating member 24 can cover multiple surfaces of the electrode assembly 22. The insulating member 24 can be an integral structure or can be formed by separate bonding. The integral structure can be selected.

[0080] The first flow guide 25 may include an insulator, and the first flow guide 25 is at least partially disposed on the side of the electrode assembly 22 facing the through hole 202. The first flow guide 25 is used to receive the electrolyte entering through the through hole 202 and guide the directional flow direction of the fluid, for example, it can guide the directional flow of the electrolyte, so that the fluid entering through the through hole 202 is guided to the outside of the insulating member 24 away from the accommodating cavity 243 through the first flow guide 25, and flows along the outer surface of the insulating member 24 away from the accommodating cavity 243 under the action of gravity to the bottom wall 241 of the housing 20a that is opposite to the first wall 201. The first flow guide 25 may be an integral flow guide structure, or a splicing structure of more than two sections of flow guide units. The first flow guide 25 may include a flow guide channel connected to the through hole 202, or may include a flow guide groove that is open and disposed toward one side of the first wall 201.

[0081] The first flow guide 25 may be connected to at least one of the electrode assembly 22 and the insulating member 24 , and may be optionally connected to the insulating member 24 .

[0082] The orthographic projection of the first flow guide 25 on the first wall 201 can completely cover the through hole 202 , so that the electrolyte entering the through hole 202 can be received by the first flow guide 25 and guided in a directional flow direction of the electrolyte.

[0083] The first flow guide 25 straddling the opening 244 can be understood as: the first flow guide 25 extends from one side of the opening 244 to the other side, is in a state of straddling the opening 244 in space, and at least partially covers the area of ​​the opening 244. It can also be understood that along the direction in which the first flow guide 25 guides the directional flow of the fluid, the extension length of the first flow guide 25 is greater than the width of the opening 244 in this direction, so that the first flow guide 25 is supported on the insulating member 24 on both sides in this direction.

[0084] Taking the example that the first air guide 25 is arranged across the opening 244 in the thickness direction Y, along the thickness direction Y, the extension length of the first air guide 25 is greater than the width of the opening 244 in this direction.

[0085] The battery cell 20 provided in one embodiment of the present application has a through hole 202 set on the first wall 201, and electrolyte can be injected into the battery cell 20 through the through hole 202. The first guide 25 is set and located between the first wall 201 and the electrode assembly 22. The orthographic projection of the first guide 25 on the first wall 201 covers the through hole 202. The first guide 25 is arranged across the opening 244 and is connected to the insulating member 24, so that the electrolyte or other fluid entering through the through hole 202 can be guided to the insulating member 24 through the first guide 25. Part 24 is away from the outside of the accommodating cavity 243. Under the action of gravity, the electrolyte flows along the outer wall of the insulating part 24 to the end of the shell 20a opposite to the first wall 201. The electrolyte can crawl under the action of capillary action. As the electrolyte accumulates, it gradually infiltrates from bottom to top, avoiding the liquid sealing phenomenon when the electrolyte infiltrates from the surrounding to the middle area, so that all parts of the electrode assembly 22 are evenly infiltrated, improving the black spots of the battery electrode, thereby avoiding the lithium precipitation phenomenon during the use of the battery cell 20 and improving the reliability of the battery cell 20.

[0086] like Figures 3 to 5 As shown, in some embodiments, the insulating member 24 includes a bottom wall 241 and a side wall 242, the side wall 242 is arranged around the bottom wall 241 and encloses a accommodating cavity 243, the bottom wall 241 and the opening 244 are arranged opposite to each other, the first flow guide member 25 is connected to the side wall 242, and a channel 255 is arranged on at least one of the bottom wall 241 and the side wall 242.

[0087] The bottom wall 241 and the side wall 242 may be arranged to intersect each other, and optionally, the bottom wall 241 and the side wall 242 may be perpendicular to each other.

[0088] The shape of the accommodating cavity 243 may match at least a partial shape of the electrode assembly 22. The electrode assembly 22 may be at least partially located in the accommodating cavity 243. Optionally, the bottom surface of the electrode assembly 22 may be fitted to the bottom wall 241, and the side surface of the electrode assembly 22 may be fitted to the side wall 242.

[0089] The insulating member 24 and the electrode assembly 22 may be connected and fixed by bonding, or by heat pressing or other methods.

[0090] The first flow guide 25 may be connected to the side wall 242 and bent relative to the side wall 242 .

[0091] The channel 255 may include structures such as holes and grooves, which are used to connect the gap formed between the insulating part 24 and the shell 21 with the accommodating cavity 243, so that the electrolyte flowing along the outer wall surface of the insulating part 24 to the end of the shell opposite to the first wall 201 enters the accommodating cavity 243 in the insulating part 24 through the channel 255 and infiltrates the electrode assembly 22 from bottom to top.

[0092] Optionally, along the axial direction of the through hole 202 , the first flow guide 25 and the bottom wall 241 may be disposed opposite to each other.

[0093] Optionally, a side of the first flow guide 25 facing the through hole 202 may have a U-shaped groove.

[0094] In a battery cell 20 provided by an embodiment of the present application, the insulating member 24 adopts the above-mentioned structural form, which can isolate the electrode assembly 22 from the shell 21, prevent the electrode assembly 22 from contacting with the shell 21 and short-circuiting, and ensure the reliability of the battery cell 20. In addition, the first flow guide 25 is connected to the side wall 242, which can ensure that the relative position of the first flow guide 25 and the through hole 202 is fixed, which is conducive to the acceptance and diversion of the electrolyte entering the through hole 202. At the same time, the above-mentioned setting can reduce the setting size of the first flow guide 25, reduce the cost and the occupied area of ​​the first flow guide 25 inside the shell 20a, and ensure the energy density requirement of the battery cell 20. The setting of the channel 255 is conducive to ensuring that the electrolyte flowing from the outer wall surface of the insulating member 24 to the end of the shell opposite to the first wall 201 enters the accommodating cavity 243 in the insulating member 24 through the channel 255 and infiltrates the electrode assembly 22 from bottom to top.

[0095] In some embodiments, the side wall 242 includes a first wall surface 2421 and a second wall surface 2422 that are oppositely disposed. The area of ​​the first wall surface 2421 is greater than the area of ​​the second wall surface 2422 . The first flow guide 25 is connected to the first wall surface 2421 .

[0096] Optionally, the first wall surface 2421 and the second wall surface 2422 may be alternately arranged in a direction surrounding the bottom wall 241 .

[0097] The first wall 2421 and the second wall 2422 may both be square. The first wall 2421 is used to isolate the large surface of the electrode assembly 22 from the shell 21 , and the second wall 2422 is used to isolate the side surface of the electrode assembly 22 from the shell 21 .

[0098] By connecting the first flow guide 25 to the first wall 2421, the first flow guide 25 and the insulating member 24 are conveniently connected to each other, and interference between the first flow guide 25 and other components of the battery cell 20, such as the insulating plate, can be avoided. In addition, the first flow guide 25 can guide the electrolyte entering the through hole 202 to the side where the first wall 2421 of the insulating member 24 is located, which is convenient for the infiltration of the electrolyte.

[0099] In some embodiments, the first guide member 25 is an integral structure, one end of the first guide member 25 is connected to one of the oppositely disposed first walls 2421 , and the other end of the first guide member 25 is connected to the other of the oppositely disposed first walls 2421 .

[0100] In the arrangement direction of the two oppositely disposed first walls 2421 , the first flow guide 25 is an integrated structure and can be disposed without interruption in the middle.

[0101] Optionally, the length of the first guide 25 may be greater than or equal to the distance between the two first walls 2421. One end of the first guide 25 may be connected to one end of one of the two first walls 2421 facing the through hole 202, and the other end of the first guide 25 may be connected to one end of the other of the two first walls 2421 facing the through hole 202.

[0102] Of course, this is an optional implementation. In some embodiments, the length of the first guide 25 can be greater than or equal to the distance between the two second walls 2422. One end of the first guide 25 can be connected to one end of one of the two second walls 2422 facing the through hole 202, and the other end of the first guide 25 can be connected to the other end of the two second walls 2422 facing the through hole 202.

[0103] The first flow guide 25 is an integrated structure, so that the first flow guide 25 is arranged in a non-disconnected manner in the drainage direction of the electrolyte, ensuring the guiding ability and carrying capacity of the electrolyte, and reducing the probability of the electrode liquid entering through the opening 244 and flowing from top to bottom into the electrode assembly 22.

[0104] It can be understood that the first flow guide member 25 being an integrated structure is only an optional embodiment.

[0105] like Figure 6 , Figure 7 As shown, in some embodiments, the first guide member 25 can also include a first sub-guide portion 251 and a second sub-guide portion 252. The first sub-guide portion 251 and the second sub-guide portion 252 are arranged opposite to each other and connected at one end facing each other, and the first sub-guide portion 251 and the second sub-guide portion 252 are connected to the insulating member 24 at one end facing away from each other, and can be optionally connected to the side wall 242 of the insulating member 24.

[0106] The first sub-guide portion 251 and the second sub-guide portion 252 may both have a guide channel or a guide groove. The first sub-guide portion 251 and the second sub-guide portion 252 may be arranged opposite to each other at one end and sealed to each other, or the first sub-guide portion 251 and the second sub-guide portion 252 may be arranged in a stacked manner at one end facing each other and overlapped and fixed to each other.

[0107] The orthographic projections of the first sub-guiding portion 251 and the second sub-guiding portion 252 on the first wall 201 may cover the through hole 202 together. Of course, the orthographic projection of one of the first sub-guiding portion 251 and the second sub-guiding portion 252 on the first wall 201 may also cover the through hole 202 .

[0108] Optionally, the first sub-guiding portion 251 may be connected to one of the first walls 2421, and the second sub-guiding portion 252 may be connected to the other first wall 2421. In the arrangement direction of the two first walls 2421 or the thickness direction Y, the sum of the lengths of the first sub-guiding portion 251 and the second sub-guiding portion 252 extending from each other is greater than or equal to the distance between the two first walls 2421.

[0109] Of course, in some embodiments, the first sub-guiding portion 251 may be connected to one of the second walls 2422, and the second sub-guiding portion 252 may be connected to the other second wall 2422. In the arrangement direction of the two second walls 2422 or in the width direction X, the sum of the lengths of the first sub-guiding portion 251 and the second sub-guiding portion 252 extending from each other is greater than or equal to the distance between the two second walls 2422.

[0110] Optionally, the U-shaped groove of the first guide member 25 includes a first guide groove 2513 and a second guide groove 2523 that are connected to each other. That is to say, when the first guide member 25 is in a split setting, it can also have a U-shaped groove to facilitate receiving and guiding the electrolyte.

[0111] The battery cell 20 provided in one embodiment of the present application can also meet the requirement that the electrolyte and other fluids entering through the through hole 202 can be guided to the outside of the insulating member 24 away from the accommodating cavity 243 through the first guide member 25, and flow along the outer wall surface of the insulating member 24 to the end of the shell 20a opposite to the first wall 201 under the action of gravity. With the accumulation of electrolyte, it gradually infiltrates from bottom to top, avoiding the phenomenon of liquid sealing when the electrolyte infiltrates from the surrounding to the middle area. In addition, the above-mentioned setting method is also conducive to the connection and synchronous molding of the first guide member 25 and the insulating member 24, reducing the difficulty of molding.

[0112] In some embodiments, the first sub-conduit portion 251 has a first conduit groove 2513, the second sub-conduit portion 252 has a second conduit groove 2523, one end of the second sub-conduit portion 252 is accommodated in the first conduit groove 2513, and the first conduit groove 2513 and the second conduit groove 2523 are connected.

[0113] The split overlap form is advantageous for the forming of the first flow guide member 25 and the insulating member 24 and can ensure the guiding requirements for the electrolyte.

[0114] In some optional embodiments, the first sub-guiding portion 251 and the second sub-guiding portion 252 are stacked toward one end of each other and overlapped and fixed to each other.

[0115] The width of the first guide groove 2513 may be greater than the width of the second guide groove 2523 , and a portion of the second sub-guide portion 252 is inserted into the first guide groove 2513 and overlapped with the first guide portion.

[0116] Exemplarily, the first sub-guiding portion 251 has a first groove bottom wall 2511 and a first groove side wall 2512 arranged oppositely, and the first groove side wall 2512 arranged oppositely and the first groove bottom wall 2511 enclose a first guide groove 2513. The second sub-guiding portion 252 has a second groove bottom wall 2521 and a second groove side wall 2522 arranged oppositely, and the second groove side wall 2522 arranged oppositely and the second groove bottom wall 2521 enclose a second guide groove 2523. The width of the first groove bottom wall 2511 may be greater than the width of the second groove bottom wall, the second groove bottom wall 2521 is stacked on the first groove bottom wall 2511, and the second groove side wall 2522 is partially located between the first groove side walls 2512 arranged oppositely. Optionally, the first groove side wall 2512 and the second groove side wall 2522 arranged on the same side may be stacked or fitted.

[0117] like Figure 8 , Fig. 9 As shown, in some embodiments, the battery cell 20 further includes a second flow guide 26 , which is disposed on the outer side of the insulating member 24 away from the accommodating cavity 243 , and the second flow guide 26 is connected to the first flow guide 25 .

[0118] The second flow guide 26 may include a flow guide groove formed by removing part of the material on the outer side wall 242 of the insulating member 24 , or may include a flow guide structure connected to the outer side wall 242 of the insulating member 24 .

[0119] The second guide 26 may be disposed on the outer side of the sidewall 242 of the insulating member 24 away from the accommodating cavity 243. When disposed on the sidewall 242 of the insulating member 24, the second guide 26 may be disposed on at least one of the first wall 2421 and the second wall 2422 and communicate with the first guide 25.

[0120] By setting the second guide member 26, the electrolyte guided by the first guide member 25 to the outside of the insulating member 24 away from the accommodating cavity 243 can be directed again so that it can quickly flow into the bottom of the shell 20a. The electrolyte can crawl under the capillary action, and the infiltration of the electrode assembly 22 can be achieved from bottom to top, avoiding the liquid sealing phenomenon caused by the electrolyte infiltrating from the surroundings to the middle.

[0121] In some embodiments, the second guide member 26 includes a third guide groove disposed outside the insulating member 24 .

[0122] A third guide groove may be formed on the outer side of the insulating member 24 away from the accommodating cavity 243 thereof by etching or the like, and the third guide groove is connected to the first guide member 25 to guide the electrolyte to flow toward the bottom of the housing 20a.

[0123] The groove depth of the third guide groove is smaller than the wall thickness of the insulating member 24 .

[0124] The third guide groove may be disposed on the side wall 242 of the insulating member 24 . For example, the third guide groove may be disposed on one of the first wall surface 2421 and the second wall surface 2422 of the insulating member 24 .

[0125] The second flow guide member 26 includes a third flow guide groove, which facilitates the molding of the second flow guide member 26 , and the third flow guide groove is molded by removing material without occupying additional internal space of the outer shell 20a , thereby ensuring the size requirements of the electrode assembly 22 and further ensuring the energy density requirements of the battery cell 20 .

[0126] In some embodiments, the first flow guide 25 has a first port 25 a and a second port 25 b , and the first port 25 a and the second port 25 b are respectively connected to the second flow guide 26 .

[0127] The first opening 25a and the second opening 25b of the first flow guide 25 are used for the outflow of the electrolyte entering the first flow guide 25. The first opening 25a and the second opening 25b can be distributed in the thickness direction Y of the battery cell 20, which can also be understood as being distributed in the arrangement direction of the two first walls 2421. Of course, they can also be distributed in the width direction X of the battery cell 20, which can also be understood as being distributed in the arrangement direction of the two second walls 2422.

[0128] like Figures 3 to 9As shown, the distribution can be understood as relative arrangement, or there can be misalignment. For example, taking the first opening 25a and the second opening 25b as an example of being distributed in the thickness direction Y of the battery cell 20, they can be arranged opposite to each other in the thickness direction Y of the battery cell 20, and the first flow guide 25 extends straight along the thickness direction Y. Of course, the first opening 25a and the second opening 25b can also be arranged misaligned in the thickness direction Y of the battery cell 20, and the first flow guide 25 is arranged along an oblique line.

[0129] The first port 25a and the second port 25b are respectively connected to the second guide member 26. It can be understood that the first port 25a and the second port 25b are respectively provided with the second guide member 26, and the electrolyte can be guided to the bottom of the housing 20a through the second guide members 26 connected to each other.

[0130] The battery cell 20 provided in one embodiment of the present application has a first port 25a and a second port 25b, and is respectively connected to a second flow guide 26, which can guide the electrolyte from both sides to the bottom of the outer shell 20a, thereby ensuring the injection efficiency of the electrolyte and reducing the risk of the electrolyte accumulating and overflowing in the first flow guide 25 and infiltrating the electrode assembly 22 from top to bottom on the side where the through hole 202 is located.

[0131] like Figure 8 , Fig. 9 As shown, in some embodiments, the second flow guides 26 are arranged in pairs, and the second flow guides 26 arranged in pairs are spaced apart from each other and symmetrically distributed on the insulating member 24 .

[0132] The second flow guide members 26 may include one pair or multiple pairs. When multiple pairs are included, each second flow guide member 26 is directly or indirectly connected to the first flow guide member 25 .

[0133] Optionally, one of the second flow guide members 26 arranged in pair is communicated with the first port 25 a and the other is communicated with the second port 25 b .

[0134] The above arrangement facilitates guiding the electrolyte from both sides to the bottom of the outer shell 20a, which can ensure the injection efficiency of the electrolyte and reduce the risk of the electrolyte accumulating and overflowing in the first guide member 25 and infiltrating the electrolyte from top to bottom on the side where the through hole 202 is located.

[0135] like Figures 8 to 10 As shown, in some optional embodiments, the second guide member 26 is extended along a straight track.

[0136] The linear trajectory may be a straight line extending along the thickness direction Y or the width direction X, or may be a straight line trajectory having a certain inclination angle with the thickness direction Y or the width direction X.

[0137] The straight line trajectory can be understood as the flow trajectory of the electrolyte after entering the second flow guide 26. The straight line trajectory mentioned above can also be determined by taking the extension trajectory of the center line connecting the first opening 25a and the second opening 25b.

[0138] By extending the second guide member 26 along a straight line, the resistance when draining the electrolyte can be reduced, ensuring that the electrolyte can be quickly guided to the bottom of the housing 20a and then climb from bottom to top by capillary action.

[0139] It can be understood that it is an optional embodiment that the second guide member 26 extends along a straight track.

[0140] like Fig.11 As shown, in some embodiments, the second flow guide 26 can also be extended along a broken line trajectory.

[0141] The broken line trajectory can be understood as the flow trajectory of the electrolyte after entering the second flow guide 26 .

[0142] Through the above arrangement, when the first port 25a or the second port 25b of the first flow guide 25 is staggered with the outflow port of the second flow guide 26, they can be connected by extending along a zigzag trajectory to ensure the directional flow guidance requirements for the electrolyte.

[0143] like Fig.12 As shown, in some embodiments, the second flow guide 26 includes a main fluid 261 and a plurality of branch fluids 262 , the main fluid 261 is connected to the first flow guide 25 , and the branch fluids 262 are spaced apart from each other and are respectively connected to the main fluid 261 .

[0144] The leading fluid 261 is used to communicate with the first guide member 25 to receive the electrolyte guided by the first guide member 25, and the branch fluids 262 are respectively connected to the leading fluid 261 to guide the electrolyte flowing to the leading fluid 261 to different positions at the bottom of the shell 20a.

[0145] The number of the diverting fluids 262 can be two, three, or more.

[0146] The branching fluids 262 may be arranged in parallel and at intervals. Of course, the extending directions of the branching fluids 262 may also partially intersect.

[0147] The second flow guide 26 adopts the combination of the main flow guide 261 and the secondary flow guide 262, which is conducive to guiding the electrolyte to different positions at the bottom of the shell 20a, ensuring the uniformity of the electrolyte infiltration.

[0148] In some embodiments, a plurality of diverter fluids 262 are spaced apart in the first direction, and one of the diverter fluids 262 is located at the center of the insulating element 24 in the first direction.

[0149] The first direction may be the width direction X of the battery cell 20 or the thickness direction Y of the battery cell 20. For example, the first direction is the width direction X of the battery cell 20. The distances from the center position to both sides of the battery cell 20 in the width direction X are the same. The center position may pass through the center line of the battery cell 20 in the width direction X and extend a distance on both sides of the center line in the width direction X. The number of the diverter fluids 262 may be one, two or more. When there are more than one, they may be spaced apart from each other in the width direction X.

[0150] Since the probability of liquid sealing in the electrode assembly 22 corresponding to the center position of the insulating member 24 is high, by locating one of the diverting fluids 262 at the center position of the insulating member 24 in the first direction, it is beneficial for the electrolyte to climb at the center position of the insulating member 24 corresponding to the electrode assembly 22, thereby reducing the probability of liquid sealing. The diverting fluids 262 are arranged on both sides of the center position to ensure the uniformity of the electrode assembly 22 from bottom to top.

[0151] The bottom to top mentioned above and below can be understood as the height direction Z of the electrode assembly 22, or in other words, the arrangement direction of the bottom wall 241 and the opening 244 of the insulating member 24, where the bottom wall 241 is located at the bottom and the opening 244 is located at the top.

[0152] In some optional embodiments, in a battery cell 20 provided in one embodiment of the present application, the first flow guide 25 and the insulating member 24 are an integrated structure.

[0153] Through the above arrangement, the connection strength between the first flow guide member 25 and the insulating member 24 can be ensured.

[0154] like Figures 3 to 5As shown, an embodiment of the present application provides a battery cell 20, including a shell 20a, an insulating member 24, an electrode assembly 22, a first flow guide 25 and a second flow guide 26. The shell 20a is a square shell as a whole, and the shell 20a includes a shell 21 and a cover plate 23. The cover plate 23 can be arranged in the shell 21 and connected to the shell 21. The cover plate 23 includes a first wall 201, and an electrode terminal 231 is arranged on the cover plate 23. The electrode assembly 22 is arranged in the shell 20a. The electrode assembly 22 may include a winding form, and the axial direction of the electrode assembly 22 after winding can be arranged in the same direction as the axial direction of the through hole 202. The insulating member 24 is arranged to cover the electrode assembly 22. The insulating member 24 includes a bottom wall 241 and a side wall 242. The side wall 242 is arranged around the bottom wall 241. The bottom wall 241 and the side wall 242 enclose a receiving cavity 243 with an opening 244. The electrode assembly 22 is arranged in the receiving cavity 243, and the opening 244 is arranged toward the first wall 201. The electrode assembly 22 is disposed in the accommodating cavity 243, and the side wall 242 includes a first wall surface 2421 and a second wall surface 2422 disposed opposite to each other. The area of ​​the first wall surface 2421 is larger than the area of ​​the second wall surface 2422, and the first flow guide 25 is connected to the first wall surface 2421. The first flow guide 25 is located between the first wall 201 and the electrode assembly 22, and the orthographic projection of the first flow guide 25 on the first wall 201 covers the through hole 202. The first flow guide 25 is arranged across the opening 244, and the first flow guide 25 is connected to the first wall surface 2421. The first flow guide 25 includes a first sub-flow guide 251 and a second sub-flow guide 252. The first sub-flow guide 251 and the second sub-flow guide 252 are disposed opposite to each other and are connected at one end facing each other, and the first sub-flow guide 251 and the second sub-flow guide 252 are respectively connected to one of the first wall surfaces 2421 at one end facing away from each other. The first sub-guiding portion 251 has a first guiding groove 2513, the second sub-guiding portion 252 has a second guiding groove 2523, one end of the second sub-guiding portion 252 is accommodated in the first guiding groove 2513, and the first guiding groove 2513 and the second guiding groove 2523 are connected, and the first guiding member 25 and the insulating member 24 are an integrated structure.The second flow guide 26 is arranged on the outer side of the insulating member 24 away from the accommodating cavity 243. The second flow guide 26 includes a third flow guide groove arranged on the outer side of the first wall 2421. The first flow guide 25 has a first port 25a and a second port 25b. The first port 25a and the second port 25b are respectively connected to the second flow guide 26. The second flow guides 26 are arranged in pairs. The paired second flow guides 26 are spaced from each other and symmetrically distributed on the insulating member 24. One of the second flow guides 26 is connected to the first port 25a, and the other second flow guide 26 is connected to the second port 25b. The second flow guide 26 extends along a straight line trajectory. The second flow guide 26 extends in the height direction Z of the battery cell 20 or in the axial direction of the through hole 202. The second flow guide 26 is arranged on the two oppositely arranged first walls 2421. The length of the second flow guide 26 can be equal to the size of the first wall 2421 in the height direction Z.

[0155] At 25℃, 1C charging and 1C discharge were performed. After the electrolyte was injected, the battery was left at 45℃ for 24h. The battery was disassembled and weighed to compare the free electrolyte in the battery: the free electrolyte in the conventional battery cell was 40g, while the free electrolyte in the battery cell of the present application provided with the first flow guide 25 was 28g. Performance comparison of the cycle test for 500 weeks: the capacity retention rate of the conventional battery cell was 88%, and the lithium deposition area in the middle of the anode pole piece in the fully charged state accounted for 35%; the capacity retention rate of the battery cell of the present application provided with the first flow guide 25 was 96%, and the lithium deposition area in the middle of the anode pole piece in the fully charged state accounted for 4%, and the reliability was more advantageous.

[0156] In a second aspect, the present application provides a battery device 100 , comprising the above-mentioned battery cell 20 .

[0157] In a third aspect, the present application provides an electrical device, including the battery device 100 described above.

[0158] 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: The housing comprises a first wall, wherein the first wall is provided with a through hole; an insulating member, disposed in the housing, the insulating member having a receiving cavity and an opening communicating with the receiving cavity, the opening being disposed toward the first wall; An electrode assembly, disposed in the accommodating cavity; The first flow guide is located between the first wall and the electrode assembly. The orthographic projection of the first flow guide on the first wall covers the through hole. The first flow guide is arranged across the opening and connected to the insulating member.

2. The battery cell according to claim 1, characterized in that: The insulating member includes a bottom wall and a side wall. The side wall is arranged around the bottom wall and encloses the accommodating cavity. The bottom wall is arranged opposite to the opening. The first flow guide is connected to the side wall. At least one of the bottom wall and the side wall is provided with a channel.

3. The battery cell according to claim 2, characterized in that: The side wall includes a first wall surface and a second wall surface that are oppositely disposed. The area of ​​the first wall surface is larger than the area of ​​the second wall surface. The first flow guide is connected to the first wall surface.

4. The battery cell according to claim 1, characterized in that: The first flow guide is an integral structure as a whole, one end of the first flow guide is connected to one of the first walls arranged oppositely, and the other end of the first flow guide is connected to the other of the first walls arranged oppositely.

5. The battery cell according to claim 1, characterized in that: The first flow guide comprises a first sub-flow guide portion and a second sub-flow guide portion. The first sub-flow guide portion and the second sub-flow guide portion are arranged opposite to each other and are connected at one end facing each other. The first sub-flow guide portion and the second sub-flow guide portion are connected to the insulating member at one end facing away from each other.

6. The battery cell according to claim 5, characterized in that: The first sub-guiding portion has a first guiding groove, the second sub-guiding portion has a second guiding groove, one end of the second sub-guiding portion is accommodated in the first guiding groove, and the first guiding groove and the second guiding groove are connected.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The battery cell further includes a second flow guide, which is disposed on an outer side of the insulating member away from the accommodating cavity, and the second flow guide is connected to the first flow guide.

8. The battery cell according to claim 7, characterized in that: The second flow guide member includes a third flow guide groove arranged outside the insulating member.

9. The battery cell according to claim 7, characterized in that: The first flow guide has a first port and a second port, and the first port and the second port are respectively connected to the second flow guide.

10. The battery cell according to claim 7, characterized in that: The second flow guides are arranged in pairs, and the second flow guides arranged in pairs are spaced apart from each other and symmetrically distributed on the insulating member.

11. The battery cell according to claim 7, characterized in that: The second flow guide is extended along a straight line track; Alternatively, the second flow guide is extended along a fold line trajectory.

12. The battery cell according to claim 7, characterized in that: The second flow guide member includes a main fluid and a plurality of branch fluids, the main fluid is communicated with the first flow guide member, and the branch fluids are arranged at intervals from each other and are respectively communicated with the main fluid.

13. The battery cell according to claim 12, characterized in that: A plurality of the diverting fluids are distributed at intervals in the first direction, and one of the diverting fluids is located at a central position of the insulating component in the first direction.

14. The battery cell according to claim 12, characterized in that: The first flow guide and the insulating member are an integrated structure.

15. A battery device, characterized in that: Comprising the battery cell according to any one of claims 1 to 14.

16. An electrical equipment, characterized in that: Comprising the battery device as claimed in claim 15.

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