End cap assembly, battery cell, battery device, and electric device

Abstract

The application discloses an end cover assembly, a battery monomer, a battery device and an electric equipment. The battery monomer comprises a shell, an electrode assembly and an end cover assembly. One end of the shell is provided with an opening; the electrode assembly is arranged in the shell; the end cover assembly covers the opening of the shell, and the end cover assembly comprises a cover body, an insulating piece and a blocking piece. The cover body is provided with a liquid injection hole; the insulating piece is arranged on one side of the cover body facing the electrode assembly, and is provided with a passing hole at a position corresponding to the liquid injection hole; the blocking piece is arranged on one side of the insulating piece away from the cover body, and the blocking piece has a first blocking surface which is arranged in a spaced manner opposite to the liquid injection hole; a plurality of shunt ribs are arranged on the first blocking surface in a spaced manner along the circumference of the first blocking surface, and each shunt rib is arranged in a direction from the middle part of the first blocking surface to the edge. The technical scheme of the application can reduce the possibility of impact damage to the electrode assembly during the liquid injection process.

Description

Technical Field

[0001] This application relates to the field of battery device technology, and in particular to an end cap assembly, a battery cell, a battery device, and an electrical device. Background Technology

[0002] The battery cell in the related technology includes a casing, an electrode assembly, and an end cap assembly. The electrode assembly is located inside the casing, and the end cap assembly is fitted onto the casing. Additionally, the end cap assembly has an injection hole for injecting electrolyte into the casing.

[0003] However, since the injection port is opposite to the electrode assembly, there is a risk of impact damage to the electrode assembly when the electrolyte is injected through the injection port. Utility Model Content

[0004] The main objective of this application is to provide a battery cell designed to reduce the possibility of impact damage to the electrode assembly during the liquid injection process.

[0005] To achieve the above objectives, the battery cell proposed in this application includes:

[0006] A housing, one end of which is open;

[0007] Electrode assembly, the electrode assembly being disposed within the housing; and

[0008] An end cap assembly is provided, which covers the opening of the housing. The end cap assembly includes a cap body, an insulating member, and a barrier member. The cap body is provided with a liquid injection hole. The insulating member is stacked on the side of the cap body facing the electrode assembly and has a clearance hole at the position corresponding to the liquid injection hole.

[0009] The baffle is located on the side of the insulating member facing away from the cover body. The baffle has a first baffle surface, which is spaced apart from the injection hole. The first baffle surface is provided with a plurality of diversion ribs, which are spaced apart circumferentially along the first baffle surface. Each diversion rib extends from the middle to the edge of the first baffle surface.

[0010] The battery cell of this application has a baffle on the side of the end cap assembly facing away from the cap body, where the baffle has a first baffle surface spaced apart from the electrolyte injection hole on the cap body. When electrolyte is injected into the battery cell through the injection hole, this first baffle surface can block the electrolyte injected from the injection hole, thus buffering and diverting the electrolyte. This changes the electrolyte from a direct stream to a diffused stream spreading around the first baffle surface, thereby dispersing the impact force of the electrolyte. Simultaneously, the combination of multiple diversion ribs on the first baffle surface allows for more uniform diffusion of the electrolyte around the first baffle surface, reducing the possibility of excessive local electrolyte pressure and further improving the dispersion of the impact force of the electrolyte, thereby reducing the possibility of impact damage to the electrode assembly during the electrolyte injection process.

[0011] In some embodiments, the area of ​​the first baffle surface is larger than the area of ​​the injection hole. The first baffle surface has a central region and a peripheral region, with the peripheral region surrounding the central region. On a projection plane perpendicular to the stacking direction of the cover body and the insulating member, the projection of the injection hole is located in the central region, and the diversion rib is disposed in the peripheral region. This ensures that the diversion rib does not occupy the central region of the first baffle surface, allowing the central region to have a relatively large area, thereby providing sufficient baffle, buffer, and diversion for the electrolyte injected from the injection hole.

[0012] In some embodiments, the projection of the injection hole coincides with the projection of the intermediate region, and one end of the diverting rib near the intermediate region extends to the boundary between the intermediate region and the peripheral region. Therefore, after the electrolyte is blocked and buffered by the intermediate region in the first baffle surface, it can promptly enter the spaces between the diverting ribs for further diversion, thereby improving the diversion effect of the diverting ribs on the electrolyte.

[0013] In some embodiments, the baffle includes a first baffle plate and a side plate. The first baffle plate is spaced apart from the injection hole and has a first baffle surface. At least a portion of the side plate is disposed between the first baffle plate and the insulating member, and is arranged in a ring structure around the circumference of the first baffle plate. One end of the diverting rib away from the center of the first baffle surface contacts the side plate. Any two adjacent diverting ribs, the first baffle surface, and the side plate enclose a diversion channel. The side plate has an outlet hole connecting the diversion channel to the outside of the side plate. This allows the diversion channel to divert electrolyte at various points along the flow path from the center to the edge of the first baffle plate, thereby improving the diversion effect of the diverting ribs on the electrolyte. Simultaneously, the outlet hole on the side plate further disperses the impact force of the electrolyte, improving the buffering effect on the electrolyte. Furthermore, the liquid outlet can also intercept and filter impurity particles trapped in the electrolyte, reducing the possibility of impurity particles entering the electrode assembly and causing damage.

[0014] In some embodiments, the side of the diversion rib away from the first baffle surface is flush with the side of the side panel near the insulator. Thus, the diversion channel has a greater depth to adequately divert the electrolyte within the space enclosed by the first baffle and the side panel.

[0015] In some embodiments, the side panel is provided with a plurality of liquid outlet holes corresponding to the region of each of the diversion channels. This improves the dispersing effect of the liquid outlet holes on the electrolyte's impact force and enhances the interception and filtration effect on impurity particles trapped within the electrolyte.

[0016] In some embodiments, the area of ​​the liquid outlet is defined as S1, satisfying the relationship: 0.5 mm. 2 ≤S1≤1mm 2 Therefore, it is possible to achieve a good balance between the efficiency of electrolyte injection into individual battery cells and the effectiveness of intercepting and filtering impurity particles trapped in the electrolyte.

[0017] In some embodiments, the baffle further includes a second baffle plate surrounding the end of the side panel away from the insulating member; the second baffle plate has a second baffle surface, which is spaced apart from the insulating member and is positioned in the stacking direction of the cover body and the insulating member. Thus, after the electrolyte flows out from the outlet hole on the side panel, the second baffle plate's second baffle surface can further act as a baffle, buffer, and diverter, thereby improving the dispersion effect on the impact force of the electrolyte.

[0018] In some embodiments, the area of ​​the first baffle surface is defined as S2, and the area of ​​the second baffle surface is defined as S3, where 0.2 ≤ S3 / S2 ≤ 0.5. This achieves a good balance between the effective buffering and diversion of the electrolyte and the compact size of the baffle component.

[0019] In some embodiments, the end of the side panel away from the first baffle is connected to the insulating member. This improves the compactness of the distribution of the baffle and the insulating member, reducing the space occupied within the battery cell's casing. It also facilitates the connection between the first baffle and the insulating member.

[0020] In some embodiments, the baffle and the insulating member are integrally formed. This simplifies the number of components and improves the assembly efficiency of the battery cells. Simultaneously, it also improves the sealing performance of the baffle, allowing the electrolyte to flow within the baffle along a predetermined path.

[0021] In some embodiments, the area of ​​the opening formed by the side panel near the end of the insulator is equal to the area of ​​the clearance hole. This simplifies the structure at the connection between the barrier and the insulator, thereby improving the ease of manufacturing the end cap assembly.

[0022] In some embodiments, the plurality of diversion ribs are evenly spaced in the circumferential direction of the first baffle surface. This improves the circumferential diversion effect on the electrolyte, thereby further enhancing the dispersion of the impact force on the electrolyte.

[0023] In some embodiments, in the stacking direction of the cover body and the insulating member, the distance between the projection line of the injection hole on the first grid surface and the injection hole is defined as L, satisfying the relationship: 0.5 mm ≤ L ≤ 10 mm. This allows for a better balance between the injection efficiency of the battery cells and the compactness of the grid member.

[0024] In some embodiments, on a projection plane perpendicular to the stacking direction of the cover body and the insulating member, the projected area of ​​the injection hole is defined as S4, and the projected area of ​​the first baffle surface is defined as S2, satisfying the relationship: 2≤S2 / S4≤5. This allows for a better balance between the injection efficiency of the battery cells and the compactness of the baffle component.

[0025] In some embodiments, the first baffle surface protrudes towards the injection hole, and in a cross-section parallel to the stacking direction of the cap body and the insulating member, the distance between opposite sides of the first baffle surface increases along the direction from the cap body to the insulating member. This allows the first baffle surface to guide the electrolyte, thus better distributing it to the various dispensing channels.

[0026] In some embodiments, the first baffle surface is a spherical surface, an arc surface, or a conical surface. This allows the first baffle surface to provide better guidance for the electrolyte. Simultaneously, it also allows the shape of the first baffle surface to be more regular, thereby improving the ease of processing and manufacturing the end cap assembly.

[0027] In some embodiments, the first grid surface is a plane. This improves the regularity of the first grid surface, thereby further enhancing the ease of manufacturing the end cap assembly.

[0028] In some embodiments, the projection of the first baffle surface is circular on a projection plane perpendicular to the stacking direction of the cover body and the insulating member. This allows for circumferential consistency, facilitating the uniform arrangement of the distribution channels.

[0029] This application also proposes an end cap assembly, including a cap body, an insulating member, and a baffle member. The cap body has an injection hole; the insulating member is stacked on one side of the cap body and has a clearance hole at a position corresponding to the injection hole; the baffle member is disposed on the side of the insulating member facing away from the cap body, and has a first baffle surface, which is spaced apart from the injection hole; the first baffle surface has a plurality of diversion ribs protruding from it, which are spaced apart circumferentially along the first baffle surface, and each diversion rib extends from the center to the edge of the first baffle surface. Therefore, when electrolyte is injected into a battery cell through the injection hole, the first baffle surface can block the electrolyte injected from the injection hole, thereby buffering and diverting the electrolyte, changing the electrolyte from a direct stream to a diffused stream spreading around the first baffle surface, thus dispersing the impact force of the electrolyte. Meanwhile, the combination of multiple diversion ribs on the first baffle surface allows the electrolyte to spread more evenly around the first baffle surface, reducing the possibility of excessive local electrolyte pressure and further improving the dispersion effect of the impact force on the electrolyte, thereby reducing the possibility of impact damage to the electrode assembly during the electrolyte injection process.

[0030] In some embodiments, the area of ​​the first baffle surface is larger than the area of ​​the injection hole. The first baffle surface has a central region and a peripheral region, with the peripheral region surrounding the central region. On a projection plane perpendicular to the stacking direction of the cover body and the insulating member, the projection of the injection hole is located in the central region, and the flow divider is located in the peripheral region. This allows the flow divider channel to divert electrolyte at various points along the flow path from the center to the edge of the first baffle, thereby improving the flow divider's effect on the electrolyte. Simultaneously, the outlet holes on the side panel further disperse the impact force of the electrolyte, improving the buffering effect on the electrolyte. Furthermore, the outlet holes can also intercept and filter impurity particles trapped in the electrolyte, reducing the possibility of impurity particles entering the electrode assembly and causing damage.

[0031] This application also proposes a battery device, including a battery box and a battery cell as described above, wherein the battery cell is disposed inside the battery box.

[0032] This application also proposes an electrical device comprising a battery cell as described above, or a battery device as described above. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0035] Figure 2 This is an exploded structural diagram of a battery device according to some embodiments of this application;

[0036] Figure 3 This is a schematic diagram of the exploded structure of a battery cell according to some embodiments of this application;

[0037] Figure 4 This is a schematic diagram of the assembly structure of the end cap assembly according to some embodiments of this application;

[0038] Figure 5 for Figure 4 Another perspective view of the mid-end cover assembly;

[0039] Figure 6 for Figure 4 Exploded view of the middle cover assembly;

[0040] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle;

[0041] Figure 8 for Figure 4 A cross-sectional view of the middle end cap assembly;

[0042] Figure 9 for Figure 8 A magnified view of a portion of point B in the middle;

[0043] Figure 10 for Figure 4 Another cross-sectional view of the middle end cap assembly;

[0044] Figure 11 for Figure 10 A magnified view of a portion of point C in the middle;

[0045] Figure 12 This is a cross-sectional schematic diagram of an end cap assembly according to other embodiments of this application.

[0046] Explanation of icon numbers:

[0047] 1000, Vehicle; 100, Battery assembly; 1, Battery box; 11, Top cover; 12, Box body; 1a, Receptacle; 2, Battery pack; 20, Battery cell; 21, End cap assembly; 21a, Electrode terminal; 211, Cover body; 211a, Liquid injection hole; 213, Insulating component; 213a, Through hole; 215, Barrier component; 2151, First barrier plate; 2151a, First barrier surface; 21511, Diverter rib; 2151b, Middle area; 2151c, Peripheral area; 2153, Side panel; 2153a, Liquid outlet; 215a, Diverter channel; 2155, Second barrier plate; 2155a, Second barrier surface; 22, Housing; 23, Electrode assembly; 231, Tab; 200, Controller; 300, Motor.

[0048] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0050] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0051] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0053] Battery devices, which are devices used to store electrical energy, are widely used not only in energy storage power systems such as hydropower, thermal power, wind power and solar power plants, but also in electric vehicles such as electric bicycles, electric motorcycles, electric cars, rail trains and other fields.

[0054] The battery device may include a battery case and individual battery cells housed within the battery case. The battery case may include a casing and a cover that closes to the casing to enclose a cavity for housing the individual battery cells. The individual battery cell is the smallest unit comprising the battery and typically includes a housing, an end cap assembly, and an electrode assembly. The housing may have an opening at one end, and the electrode assembly may be housed within the housing. The end cap assembly may close the opening of the housing and includes an injection port for injecting electrolyte into the housing. The electrode assembly is the component within the individual battery cell where the electrochemical reaction actually occurs. It may include a positive electrode, a negative electrode, and a separator located between them, and is formed by winding or stacking the positive electrode, negative electrode, and separator. The individual battery cell may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. Furthermore, the individual battery cell may be cylindrical, flat, cuboid, or other shapes. In addition, the battery box can contain multiple battery cells, which can be connected in series, in parallel, or in a hybrid connection that includes both series and parallel connections.

[0055] During the production of a battery cell, an electrolyte needs to be injected. Since the injection hole on the end cap assembly is opposite to the electrode assembly located inside the casing, there is a risk of impact damage to the electrode assembly when the electrolyte is injected through the injection hole.

[0056] Therefore, based on the above considerations, in order to solve the problem that the electrode assembly is easily damaged by the electrolyte injected through the injection hole during the current battery cell injection process, this application proposes a novel battery cell. This battery cell innovatively provides a baffle below the insulating component in the end cap assembly. The baffle has a first baffle surface that is spaced apart from the injection hole, and multiple diversion ribs are provided on the first baffle surface. Each diversion rib extends from the middle to the edge of the first baffle surface, so that the first baffle surface and multiple diversion ribs can act as a baffle, buffer and divert the electrolyte injected from the injection hole, realize the electrolyte injection in a heat dissipation manner, disperse the impact force of the electrolyte and reduce the possibility of impact damage to the electrode assembly.

[0057] Furthermore, it should be noted that the battery cells proposed in this application can be directly applied to electrical devices to provide power. Alternatively, battery devices can be used and then further applied to electrical devices to provide power. These electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, rail trains, ships, and spacecraft. Furthermore, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., while spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0058] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0059] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0060] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0061] Please refer to the reference. Figure 2 and Figure 3 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes battery cells 20. In the battery device 100, there may be at least two battery cells 20, which may be connected in series, parallel, or in a mixed configuration to form a battery pack 2. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel. The battery device 100 may also include a battery case 1, which provides a receiving space for the battery cells 20. The battery case 1 can adopt various structures. In some embodiments, the battery case 1 may include a cover 11 and a body 12 that overlap each other to jointly define a receiving cavity 1a for receiving the battery cells 20. The cover 11 and the body 12 may both be hollow structures with an opening on one side, with the opening side of the cover 11 overlapping the opening side of the body 12. Of course, the battery case 1 formed by the cover 11 and the body 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0062] The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar for realizing electrical connection between multiple battery cells 20.

[0063] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0064] Please refer to the reference. Figure 2 and Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit constituting the battery device 100. For example... Figure 3 As shown, the battery cell 20 includes an end cap assembly 21, a housing 22, an electrode assembly 23, and other functional components.

[0065] End cap assembly 21 refers to a component that covers one end opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. Not limited to this, the shape of end cap assembly 21 can be adapted to the shape of housing 22 to fit the housing 22. Functional components such as electrode terminals 21a may be provided on end cap assembly 21. Electrode terminals 21a can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. In some embodiments, end cap assembly 21 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold.

[0066] The housing 22 is a component used to cooperate with the end cap assembly 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap assembly 21 can be independent components. An opening can be provided on the housing 22, and the end cap assembly 21 can close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap assembly 21 and the housing 22 can be integrated. Specifically, the end cap assembly 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap assembly 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0067] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab 231. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs 231 connect to the electrode terminals 21a to form a current loop.

[0068] The structure of the end cap assembly 21 proposed in this application will be explained and illustrated next with examples:

[0069] Please refer to the reference. Figures 4 to 7 In one embodiment of this application, the end cap assembly 21 includes a cap body 211, an insulating member 213, and a baffle member 215. The cap body 211 is provided with an injection hole 211a. The insulating member 213 is stacked on the side of the cap body 211 facing the electrode assembly 23 and has a passage hole 213a at the position corresponding to the injection hole 211a. The baffle member 215 is provided on the side of the insulating member 213 facing away from the cap body 211. The baffle member 215 has a first baffle surface 2151a, which is spaced apart from the injection hole 211a. The first baffle surface 2151a is provided with a plurality of diversion ribs 21511, which are spaced apart circumferentially along the first baffle surface 2151a. Each diversion rib 21511 extends from the middle to the edge of the first baffle surface 2151a.

[0070] The cover body 211 is located on the outer side relative to the insulating member 213. For example, when the opening of the housing 22 of the battery cell 20 is facing upwards, the cover body 211 can be stacked with the insulating member 213 in a top-to-bottom direction. The cover body 211 can be made of a material with certain hardness and strength, such as copper, iron, aluminum, stainless steel, or aluminum alloy, to enhance the overall strength of the end cap assembly 21, thus preventing deformation and damage when the end cap assembly 21 is subjected to pressure or impact. Furthermore, functional components such as the electrode terminals 21a described above, as well as a pressure relief mechanism, can be provided on the cover body 211. In addition, the injection hole 211a provided on the cover body 211 can be used to inject electrolyte into the housing 22 of the battery cell 20. The shape of the injection hole 211a can be circular, square, rectangular, or elliptical, etc., and this application does not limit this.

[0071] The insulating member 213 is located inside the cover body 211 to isolate the electrode assembly 23 within the housing 22 of the battery cell 20 from the cover body 211, reducing the risk of short circuits. The insulating member 213 can be made of insulating materials such as plastic or rubber. Furthermore, the shape of the insulating member 213 can be identical to that of the cover body 211. For example, in the stacking direction perpendicular to the cover body 211 and the insulating member 213, the projections of the cover body 211 and the insulating member 213 can be rectangular. Additionally, the passage hole 213a provided on the insulating member 213 allows electrolyte injected through the injection hole 211a to pass through. In the projection plane perpendicular to the stacking direction of the cover body 211 and the insulating member 213, the projection of the passage hole 213a can coincide with the projection of the injection hole 211a; alternatively, the projection of the injection hole 211a can be located inside the passage hole 213a. When the projection of the injection hole 211a is located inside the passage hole 213a, the shape of the injection hole 211a and the shape of the passage hole can be the same or different. In addition, when the cover body 211 and the insulating member 213 are stacked in the vertical direction as described above, the stacking direction of the cover body 211 and the insulating member 213 is also the vertical direction.

[0072] The baffle 215 is located on the side of the insulating member 213 facing away from the cover body 211, that is, when the end cap assembly 21 is installed at the opening of the housing 22 of the battery cell 20, the baffle 215 can be located on the side of the insulating member 213 facing the electrode assembly 23. Specifically, when the opening of the housing 22 is facing upwards, the baffle 215 can be located between the lower part of the injection hole 211a and the upper part of the electrode assembly 23. Furthermore, the baffle 215 can be a plate structure, or it can be a cylindrical structure with an open top. On the projection plane perpendicular to the stacking direction of the cover body 211 and the insulating member 213, the projected shape of the baffle 215 can be circular, rectangular, or square, etc. Therefore, this application does not limit the structural type and shape of the baffle 215. In addition, the baffle 215 can be directly connected to the insulating member 213. In this case, the baffle 215 and the insulating member 213 can be an integral structure. The integrated structure, namely the baffle 215 and the insulating component 213, is manufactured using a one-piece molding process, forming a single unit during manufacturing, such as injection molding or 3D printing. Alternatively, the baffle 215 and the insulating component 213 can be separate structures, later connected as a whole by adhesive bonding or snap-fit ​​connections. Or, the baffle 215 can be indirectly connected to the insulating component 213, for example, by spacing the baffle 215 and the insulating component 213 apart and connecting them with an additional connector. Furthermore, a first baffle surface 2151a can be formed on the side of the baffle 215 facing the injection hole 211a, serving to baffle, buffer, and divert the electrolyte injected from the injection hole 211a. The first baffle surface 2151a can be a plane, or it can be a spherical, arc-shaped, or conical surface protruding towards the injection hole 211a. Furthermore, on the projection surface perpendicular to the stacking direction of the cover body 211 and the insulating member 213, the projected area of ​​the first baffle surface 2151a can be larger than the projected area of ​​the injection hole 211a, or it can be equal to the projected area of ​​the injection hole 211a. The projected shape of the first baffle surface 2151a can be circular, or it can be square or rectangular, etc. Further, the flow-diverting ribs 21511 provided on the first baffle surface 2151a can divide the first baffle surface 2151a in its circumference, so as to guide the electrolyte located on the first baffle surface 2151a to enter each area more evenly and diffuse towards the periphery of the first baffle surface 2151a. Multiple flow-diverting ribs 21511 can be evenly spaced in the circumference of the first baffle surface 2151a. Alternatively, two adjacent diversion ribs 21511 can form a group of ribs, with each group of ribs arranged at uniform intervals in the circumferential direction on the first grid baffle 2151a. In addition, one end of the diversion rib 21511 near the middle of the first grid baffle 2151a can extend to the center of the first grid baffle 2151a.At this point, the ends of the various diversion ribs 21511 that are close to each other can be connected. Alternatively, the end of the diversion rib 21511 near the center of the first baffle surface 2151a may not extend to the center of the first baffle surface 2151a. In this case, the ends of the various diversion ribs 21511 that are close to each other can be spaced apart. Similarly, the end of the diversion rib 21511 away from the center of the first baffle surface 2151a can extend to the edge of the first baffle surface 2151a, or it can be spaced apart from the edge. Furthermore, the diversion rib 21511 and the baffle member 215 can be an integral structure, or they can be separate structures.

[0073] The battery cell 20 of this application has a baffle 215 provided on the side of the insulating member 213 of the end cap assembly 21 facing away from the cover body 211. The baffle 215 has a first baffle surface 2151a that is spaced apart from the liquid injection hole 211a on the cover body 211. When the battery cell 20 is injected with liquid through the liquid injection hole 211a, the first baffle surface 2151a can block the electrolyte injected from the liquid injection hole 211a, thereby buffering and diverting the electrolyte. This allows the electrolyte to change from a direct jet to a diffused state that spreads around the first baffle surface 2151a, thereby dispersing the impact force of the electrolyte. Meanwhile, the multiple diversion ribs 21511 on the first baffle surface 2151a can make the electrolyte spread more evenly around the first baffle surface 2151a, reduce the possibility of excessive local electrolyte pressure, and further improve the dispersion effect of the impact force on the electrolyte, so as to reduce the possibility of impact damage to the electrode assembly 23 during the liquid injection process.

[0074] Please refer to the reference. Figures 6 to 9 In one embodiment of this application, the area of ​​the first baffle surface 2151a is larger than the area of ​​the injection hole 211a. The first baffle surface 2151a has a middle region 2151b and a peripheral region 2151c, with the peripheral region 2151c surrounding the middle region 2151b. On the projection plane perpendicular to the stacking direction of the cover body 211 and the insulating member 213, the projection of the injection hole 211a is located in the middle region 2151b, and the diversion rib 21511 is provided in the peripheral region 2151c.

[0075] The intermediate region 2151b is the portion of the first grid surface 2151a opposite to the injection hole 211a in the stacking direction perpendicular to the cover body 211 and the insulating member 213. The peripheral region 2151c is the portion of the first grid surface 2151a that is misaligned with the injection hole 211a in the stacking direction perpendicular to the cover body 211 and the insulating member 213.

[0076] In this embodiment, the area of ​​the first baffle surface 2151a is set to be larger than the area of ​​the injection hole 211a, and the diversion rib 21511 is further set only in the peripheral area 2151c of the first baffle surface 2151a that is offset from the injection hole 211a. This ensures that the diversion rib 21511 does not occupy the middle area 2151b in the first baffle surface 2151a, so that the middle area 2151b has a relatively large area, which can play a sufficient role in baffle, buffer and divert the electrolyte injected from the injection hole 211a.

[0077] Please refer to the reference. Figures 6 to 9 In one embodiment of this application, the projection of the injection hole 211a coincides with the projection of the middle region 2151b, and the end of the diversion rib 21511 near the middle region 2151b extends to the junction of the middle region 2151b and the peripheral region 2151c.

[0078] In this embodiment, the end of the diversion rib 21511 near the middle region 2151b is extended to the junction of the middle region 2151b and the peripheral region 2151c, so that it is located just below the wall of the injection hole 211a. After the electrolyte is blocked and buffered by the middle region 2151b in the first baffle surface 2151a, it can enter the diversion ribs 21511 in time for diversion, thereby improving the diversion effect of the diversion rib 21511 on the electrolyte.

[0079] Please refer to the reference. Figure 6 , Figure 7 ,as well as Figure 10 and Figure 11 In one embodiment of this application, the baffle 215 includes a first baffle 2151 and a side plate 2153. The first baffle 2151 is disposed at a distance from the injection hole 211a and has a first baffle surface 2151a. At least a portion of the side plate 2153 is disposed between the first baffle 2151 and the insulating member 213 and is arranged in a ring structure around the first baffle 2151 in the circumferential direction. One end of the diversion rib 21511 away from the middle of the first baffle surface 2151a contacts the side plate 2153. Any two adjacent diversion ribs 21511, the first baffle surface 2151a, and the side plate 2153 are arranged to form a diversion channel 215a. The side plate 2153 is provided with an outlet hole 2153a that connects the diversion channel 215a and the outside of the side plate 2153.

[0080] The first baffle 2151 can be a flat plate or an arc-shaped plate; this application does not limit this, as long as the first baffle surface 2151a can be formed on the upper surface. The side panel 2153 can form a ring structure around the first baffle 2151, i.e., a structure open at both ends. The side panel 2153 can be a grid structure or a mesh structure. In addition, the upper end of the side panel 2153 can be directly connected to the insulating member 213, or it can be spaced apart from the insulating member 213. Furthermore, the side panel 2153 and the first baffle 2151 can be an integral structure or separate structures.

[0081] In this embodiment, the baffle 215 is configured to include a first baffle plate 2151 and a side plate 2153. The first baffle plate 2151 forms a first baffle surface 2151a, and the side plate 2153 surrounds the first baffle surface 2151a and contacts the end of the reinforcing rib away from the middle of the first baffle plate 2151. This allows any two adjacent diversion ribs 21511 to form a diversion channel 215a with the first baffle surface 2151a and the side plate 2153. This allows the electrolyte to be diverted at various points along the flow path from the middle to the edge of the first baffle plate 2151, thereby improving the diversion effect of the diversion ribs 21511 on the electrolyte. Simultaneously, after the electrolyte is blocked and buffered by the first baffle 2151 and diverted by the diversion channel 215a, the electrolyte can only flow out from the outlet hole 2153a on the side plate 2153 into the casing 22 of the battery cell 20. At this time, the outlet hole 2153a on the side plate 2153 can further disperse the impact force of the electrolyte and improve the buffering effect on the electrolyte. At the same time, the outlet hole 2153a can also intercept and filter impurity particles mixed in the electrolyte, reducing the possibility of impurity particles entering the electrode assembly 23 and causing damage to it.

[0082] Please refer to the reference. Figure 10 and Figure 11 In one embodiment of this application, the side of the diversion rib 21511 away from the first grid surface 2151a is flush with the side of the side panel 2153 near the insulating member 213.

[0083] The upper end of the diversion rib 21511 is flush with the upper end of the side panel 2153, that is, the upper surface of the diversion rib 21511 and the upper surface of the side panel 2153 are at the same height.

[0084] In this embodiment, the upper surface of the diversion rib 21511 and the upper surface of the side panel 2153 are set to the same height, so that the diversion channel 215a formed by the diversion rib 21511, the first baffle 2151 and the side panel 2153 has a deeper depth, so as to fully divert the electrolyte in the space formed by the first baffle 2151 and the side panel 2153.

[0085] Please refer to the reference. Figure 10 and Figure 11 In one embodiment of this application, the side panel 2153 is provided with a plurality of liquid outlet holes 2153a in the area corresponding to each diversion channel 215a.

[0086] In this embodiment, the side panel 2153 is provided with multiple liquid outlet holes 2153a at the positions corresponding to each diversion channel 215a, which can improve the dispersion effect of the liquid outlet holes 2153a on the impact force of the electrolyte, as well as the interception and filtration effect on impurity particles mixed in the electrolyte.

[0087] In one embodiment of this application, the area of ​​the liquid outlet 2153a is defined as S1, satisfying the relationship: 0.5 mm. 2 ≤S1≤1mm 2 .

[0088] In this embodiment, the area S1 of the liquid outlet 2153a is set to 0.5 mm. 2 up to 1 mm 2 This ensures that the area of ​​the liquid outlet 2153a is not too small, which would affect the liquid injection efficiency of the battery cell 20. Simultaneously, it also ensures that the area of ​​the liquid outlet 2153a is not too large, which would affect the interception and filtration effect of impurity particles mixed in the electrolyte. Specifically, the area S1 of the liquid outlet 2153a can be 0.5 mm. 2 0.6 mm 2 0.7 mm 2 0.8 mm 2 0.9 mm 2 1 mm 2 Of course, it can also be any value within the above range.

[0089] Please refer to Figure 12 In one embodiment of this application, the baffle 215 further includes a second baffle plate 2155, which surrounds the side panel 2153 at the end away from the insulating member 213; the second baffle plate 2155 has a second baffle surface 2155a, which is disposed at a distance from the insulating member 213 and is in the stacking direction of the cover body 211 and the insulating member 213.

[0090] The second baffle 2155 can have the same height as the first baffle 2151. Alternatively, it can be lower than the first baffle 2151. Furthermore, on the projection plane perpendicular to the stacking direction of the cover body 211 and the insulating member 213, the projected shape of the second baffle 2155 can be the same as or different from the projected shape of the side panel 2153. Additionally, the upper surface of the second baffle 2155 can be formed as a second baffle surface 2155a, which can be flat or curved. When the second baffle surface 2155a is curved, in the cross-section parallel to the stacking direction of the cover body 211 and the insulating member 213 (i.e., in the vertical cross-section), the distance between the two sides of the second baffle surface 2155a can decrease from top to bottom.

[0091] In this embodiment, a second baffle 2155 is further provided on the outer side of the side panel 2153, so that after the electrolyte flows out from the outlet hole 2153a on the side panel 2153, the second baffle surface 2155a on the second baffle 2155 can further block, buffer and divert the flow, so as to improve the dispersion effect of the impact force on the electrolyte.

[0092] In one embodiment of this application, the area of ​​the first grid surface 2151a is defined as S2, the area of ​​the second grid surface 2155a is defined as S3, and 0.2≤S3 / S2≤0.5.

[0093] In this embodiment, the ratio of the area S3 of the second baffle surface 2155a to the area S2 of the first baffle surface 2151a is set to 0.2 to 0.5. This ensures that the area of ​​the second baffle surface 2155a is not too small, which would affect the baffle, buffer, and diversion effect on the electrolyte. At the same time, it also ensures that the area of ​​the second baffle surface 2155a is not too large, which would result in excessive space occupation within the casing 22 of the battery cell 20.

[0094] Please refer to the reference. Figure 10 and Figure 11 In one embodiment of this application, the end of the side panel 2153 away from the first baffle 2151 is connected to the insulating member 213.

[0095] In this embodiment, connecting the upper end of the side panel 2153 to the insulating member 213 allows the barrier member 215 to be close to the insulating member 213, thereby improving the compactness of their distribution and reducing the space occupied within the casing 22 of the battery cell 20. It also facilitates the connection between the first barrier member 215 and the insulating member 213.

[0096] Please refer to the reference. Figure 10 and Figure 11In one embodiment of this application, the barrier 215 and the insulating member 213 are an integral structure.

[0097] In this embodiment, the baffle 215 and the insulator 213 are integrated into a single structure, which simplifies the number of parts and improves the assembly efficiency of the battery cell 20. Simultaneously, it also improves the sealing performance of the baffle 215, allowing the electrolyte to flow within the baffle 215 along a predetermined path.

[0098] Please refer to the reference. Figure 10 and Figure 11 In one embodiment of this application, the area of ​​the opening formed by the side panel 2153 near the end of the insulating member 213 is equal to the area of ​​the through hole 213a.

[0099] In this embodiment, the size of the opening formed by the upper end of the side panel 2153 is set to be the same as the size of the clearance hole 213a, so that the structure at the connection between the barrier 215 and the insulating member 213 can be simplified, thereby improving the convenience of processing and manufacturing the end cap assembly 21.

[0100] Please refer to the reference. Figure 6 and Figure 7 In one embodiment of this application, a plurality of diversion ribs 21511 are evenly spaced in the circumferential direction of the first grid surface 2151a.

[0101] In this embodiment, the multiple diversion ribs 21511 are arranged at uniform intervals in the circumferential direction, which can improve the diversion effect of the electrolyte in the circumferential direction, and further improve the dispersion effect of the impact force on the electrolyte.

[0102] Please refer to the reference. Figure 8 and Figure 9 In one embodiment of this application, in the stacking direction of the cover body 211 and the insulating member 213, the distance between the projection line of the injection hole 211a on the first grid surface 2151a and the injection hole 211a is defined as L, which satisfies the relationship: 0.5 mm ≤ L ≤ 10 mm.

[0103] The projection line of the injection hole 211a onto the first baffle surface 2151a is the position on the first baffle surface 2151a corresponding to the hole wall of the injection hole 211a. When the projection of the injection hole 211a coincides with the projection of the intermediate region 2151b, this projection line can also be the boundary between the intermediate region 2151b and the peripheral region 2151c in the first baffle surface 2151a.

[0104] In this embodiment, the distance L between the position on the first baffle surface 2151a corresponding to the wall of the injection hole 211a and the injection hole 211a in the vertical direction is set to 0.5 mm to 10 mm. This ensures that the distance L is not too small, which would affect the injection efficiency of the battery cell 20. At the same time, it also ensures that the distance L is not too large, which would result in the baffle component 215 being too large and occupying too much space within the casing 22 of the battery cell 20. The distance L can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, or 10 mm, or any value within the above range.

[0105] In one embodiment of this application, on the projection surface perpendicular to the stacking direction of the cover body 211 and the insulating member 213, the projected area of ​​the injection hole 211a is defined as S4, and the projected area of ​​the first grid surface 2151a is defined as S2, satisfying the relationship: 2≤S2 / S4≤5.

[0106] In this embodiment, the projected area S2 of the first baffle surface 2151a and the projected area S4 of the injection hole 211a are set to 2 to 5. This ensures that the first baffle surface 2151a is not too small, which would affect the size of the side plate 2153 and thus the size of the injection hole 2153a on the side plate 2153, thereby affecting the injection efficiency of the battery cell 20. At the same time, it also ensures that the first baffle surface 2151a is not too large, which would result in the baffle member 215 being too large and occupying too much space within the casing 22 of the battery cell 20.

[0107] Please refer to the reference. Figure 6 , Figure 7 as well as Figure 10 and Figure 11 In one embodiment of this application, the first grid surface 2151a protrudes toward the injection hole 211a, and in a cross section parallel to the stacking direction of the cover body 211 and the insulating member 213, the distance between the two sides of the first grid surface 2151a increases along the direction from the cover body 211 to the insulating member 213.

[0108] In this embodiment, the first baffle 2151a is protruding toward the injection hole 211a, and the distance between the first baffle 2151a and its two sides is increased from top to bottom, so that the first baffle 2151a can guide the electrolyte to better distribute it to each liquid distribution channel.

[0109] Please refer to the reference. Figure 6 , Figure 7 as well as Figure 10 and Figure 11In one embodiment of this application, the first blocking surface 2151a is a spherical surface, an arc surface, or a conical surface.

[0110] In this embodiment, setting the first baffle surface 2151a as a spherical, arc-shaped, or conical surface allows it to provide better guidance for the electrolyte. It also makes the shape of the first baffle surface 2151a more regular, thus improving the ease of manufacturing the end cap assembly 21. Specifically, when the first baffle surface 2151a is arc-shaped, in a cross-section parallel to the stacking direction of the cap body 211 and the insulating member 213, the arc surfaces on opposite sides of the first baffle surface 2151a can be concave or convex. Furthermore, the arc surfaces on opposite sides of the first baffle surface 2151a can connect at the upper end with a sharp corner, a rounded transition, or a planar connection.

[0111] In one embodiment of this application, the first grid surface 2151a is a plane.

[0112] In this embodiment, setting the first grid blocking surface 2151a as a plane can improve the regularity of the first grid blocking surface 2151a, thereby further improving the convenience of processing and manufacturing the end cap assembly 21.

[0113] Please refer to the reference. Figure 10 and Figure 11 In one embodiment of this application, the surface of the first baffle 2151 facing away from the first baffle surface 2151a can be adapted to the first baffle surface 2151a, for example, both can be flat, or both can be curved, or both can be spherical, so that the wall thickness of the first baffle 2151 can be relatively uniform, improving the convenience of its processing and manufacturing. Similarly, the surface of the second baffle 2155 facing away from the second baffle surface 2155a can be adapted to the second baffle surface 2155a.

[0114] Please refer to the reference. Figure 4 and Figure 5 In one embodiment of this application, the projection of the first grid surface 2151a is circular on the projection plane perpendicular to the stacking direction of the cover body 211 and the insulating member 213.

[0115] In this embodiment, the first grid baffle 2151a is set to be circular, which can make it consistent in the circumferential direction, thereby facilitating the uniform arrangement of the diversion channels 215a.

[0116] Please refer to the reference. Figures 4 to 11In one embodiment of this application, the end cap assembly 21 includes a cap body 211, an insulating member 213, and a baffle member 215. The cap body 211 is provided with an injection hole 211a. The insulating member 213 is stacked on the side of the cap body 211 facing the electrode assembly 23 and has a passage hole 213a at the position corresponding to the injection hole 211a. The baffle member 215 is provided on the side of the insulating member 213 facing away from the cap body 211. The baffle member 215 has a first baffle surface 2151a, which is spaced apart from the injection hole 211a. The first baffle surface 2151a is provided with a plurality of diversion ribs 21511, which are spaced apart circumferentially along the first baffle surface 2151a. Each diversion rib 21511 extends from the middle to the edge of the first baffle surface 2151a. The area of ​​the first baffle surface 2151a is larger than the area of ​​the injection hole 211a. The first baffle surface 2151a has a middle region 2151b and a peripheral region 2151c, with the peripheral region 2151c surrounding the middle region 2151b. On a projection plane perpendicular to the stacking direction of the cover body 211 and the insulating member 213, the projection of the injection hole 211a is located in the middle region 2151b, and the flow divider 21511 is located in the peripheral region 2151c. The projection of the injection hole 211a coincides with the projection of the middle region 2151b, and one end of the flow divider 21511 near the middle region 2151b extends to the junction of the middle region 2151b and the peripheral region 2151c. The baffle 215 includes a first baffle 2151 and a side plate 2153. The first baffle 2151 is spaced apart from the injection hole 211a and has a first baffle surface 2151a. At least a portion of the side plate 2153 is disposed between the first baffle 2151 and the insulating member 213 and is arranged in a ring structure around the first baffle 2151. One end of the diversion rib 21511 away from the middle of the first baffle surface 2151a contacts the side plate 2153. Any two adjacent diversion ribs 21511, the first baffle surface 2151a, and the side plate 2153 enclose and are configured to form a diversion channel 215a. The side plate 2153 is provided with an outlet hole 2153a that connects the diversion channel 215a and the outside of the side plate 2153. The side of the diversion rib 21511 away from the first baffle surface 2151a is flush with the side of the side panel 2153 near the insulating member 213. The side panel 2153 has multiple liquid outlet holes 2153a corresponding to the area of ​​each diversion channel 215a. The area of ​​the liquid outlet hole 2153a is defined as S1, satisfying the relationship: 0.5 mm. 2 ≤S1≤1mm 2The barrier 215 further includes a second barrier plate 2155, which surrounds the end of the side panel 2153 away from the insulating member 213. The second barrier plate 2155 has a second barrier surface 2155a, which is spaced apart from the insulating member 213 and is located in the stacking direction of the cover body 211 and the insulating member 213. The area of ​​the first barrier surface 2151a is defined as S2, and the area of ​​the second barrier surface 2155a is defined as S3, where 0.2 ≤ S3 / S2 ≤ 0.5. The end of the side panel 2153 away from the first barrier plate 2151 is connected to the insulating member 213. The barrier 215 and the insulating member 213 are an integral structure. The area of ​​the opening formed by the side panel 2153 near the insulating member 213 is equal to the area of ​​the passage hole 213a. Multiple diversion ribs 21511 are evenly spaced circumferentially on the first baffle surface 2151a. In the stacking direction of the cover body 211 and the insulating member 213, the distance between the projection line of the injection hole 211a onto the first baffle surface 2151a and the injection hole 211a is defined as L, satisfying the relationship: 0.5 mm ≤ L ≤ 10 mm. On the projection plane perpendicular to the stacking direction of the cover body 211 and the insulating member 213, the projected area of ​​the injection hole 211a is defined as S4, and the projected area of ​​the first baffle surface 2151a is defined as S2, satisfying the relationship: 2 ≤ S2 / S4 ≤ 5. The first baffle surface 2151a protrudes towards the injection hole 211a, and in a cross-section parallel to the stacking direction of the cover body 211 and the insulating member 213, the distance between the opposite sides of the first baffle surface 2151a increases along the direction from the cover body 211 to the insulating member 213. The first baffle surface 2151a is a spherical, arc-shaped, or conical surface. On the projection plane perpendicular to the stacking direction of the cover body 211 and the insulating member 213, the projection of the first baffle surface 2151a is a circle.

[0117] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery cell, characterized in that, include: A housing, one end of which is open; An electrode assembly, wherein the electrode assembly is disposed within the housing; as well as An end cap assembly is provided, which covers the opening of the housing. The end cap assembly includes a cap body, an insulating member, and a barrier member. The cap body is provided with a liquid injection hole. The insulating member is stacked on the side of the cap body facing the electrode assembly and has a clearance hole at the position corresponding to the liquid injection hole. The baffle is located on the side of the insulating member facing away from the cover body. The baffle has a first baffle surface, which is spaced apart from the injection hole. The first baffle surface is provided with a plurality of diversion ribs, which are spaced apart circumferentially along the first baffle surface. Each diversion rib extends from the middle to the edge of the first baffle surface.

2. The battery cell as described in claim 1, characterized in that, The area of ​​the first baffle surface is larger than the area of ​​the injection hole, and the first baffle surface has a central area and a peripheral area, with the peripheral area surrounding the central area; On a projection plane perpendicular to the stacking direction of the cover body and the insulating component, the projection of the injection hole is located in the middle region, and the diversion rib is located in the peripheral region.

3. The battery cell as described in claim 2, characterized in that, The projection of the injection hole coincides with the projection of the middle region, and the end of the diversion rib near the middle region extends to the junction of the middle region and the peripheral region.

4. The battery cell as described in claim 1, characterized in that, The blocking component includes: A first baffle plate is provided at a distance from the injection hole, and the first baffle plate has a first baffle surface; and A side panel, at least a portion of which is disposed between the first grid plate and the insulating member, and is arranged in a ring structure around the circumference of the first grid plate. One end of the diversion rib away from the middle of the first grid surface contacts the side panel. Any two adjacent diversion ribs, together with the first grid surface and the side panel, form a diversion channel. The side panel is provided with an outlet hole that connects the diversion channel to the outside of the side panel.

5. The battery cell as described in claim 4, characterized in that, The side of the diversion rib away from the first grid surface is flush with the side of the side panel near the insulating component.

6. The battery cell as described in claim 4, characterized in that, The side panel is provided with a plurality of liquid outlet holes corresponding to the area of ​​each of the diversion channels.

7. The battery cell as described in claim 4, characterized in that, The area of ​​the liquid outlet is defined as S1, satisfying the relationship: 0.5 mm. 2 ≤S1≤1mm 2 .

8. The battery cell as described in claim 4, characterized in that, The barrier also includes a second barrier plate, which surrounds the side panel at the end away from the insulator. The second baffle has a second baffle surface, which is disposed at a distance from the insulating member and in the stacking direction of the cover body and the insulating member.

9. The battery cell as described in claim 8, characterized in that, Define the area of ​​the first grid as S2, the area of ​​the second grid as S3, and 0.2≤S3 / S2≤0.

5.

10. The battery cell as described in claim 4, characterized in that, The end of the side panel away from the first baffle is connected to the insulating element.

11. The battery cell as described in claim 10, characterized in that, The barrier and the insulating component are an integral structure.

12. The battery cell as described in claim 4, characterized in that, The area of ​​the opening formed by the side panel near the end of the insulating member is equal to the area of ​​the through hole.

13. The battery cell according to any one of claims 1 to 12, characterized in that, The plurality of diversion ribs are evenly spaced in the circumferential direction of the first grid surface.

14. The battery cell according to any one of claims 1 to 12, characterized in that, In the stacking direction of the cover body and the insulating component, the distance between the projection line of the injection hole on the first grid surface and the injection hole is defined as L, satisfying the relationship: 0.5 mm ≤ L ≤ 10 mm.

15. The battery cell according to any one of claims 1 to 12, characterized in that, On the projection plane perpendicular to the stacking direction of the cover body and the insulating component, the projected area of ​​the injection hole is defined as S4, and the projected area of ​​the first baffle surface is defined as S2, satisfying the relationship: 2≤S2 / S4≤5.

16. The battery cell according to any one of claims 1 to 12, characterized in that, The first grid surface protrudes towards the injection hole, and in a cross section parallel to the stacking direction of the cover body and the insulating member, the distance between the two opposite sides of the first grid surface increases along the direction from the cover body to the insulating member.

17. The battery cell as described in claim 16, characterized in that, The first blocking surface is a spherical surface, an arc surface, or a conical surface.

18. The battery cell according to any one of claims 1 to 12, characterized in that, The first grid surface is a plane.

19. The battery cell according to any one of claims 1 to 12, characterized in that, On a projection plane perpendicular to the stacking direction of the cover body and the insulating component, the projection of the first grid surface is circular.

20. An end cap assembly, characterized in that, include: The cap body is provided with a liquid injection hole; An insulating component is stacked on one side of the cover body and has a clearance hole at the position corresponding to the injection hole; as well as A baffle is provided on the side of the insulating member facing away from the cover body. The baffle has a first baffle surface, which is spaced apart from the injection hole. The first baffle surface is provided with a plurality of diversion ribs, which are spaced apart circumferentially along the first baffle surface. Each diversion rib extends from the middle to the edge of the first baffle surface.

21. The end cap assembly as claimed in claim 20, characterized in that, The area of ​​the first baffle surface is larger than the area of ​​the injection hole, and the first baffle surface has a central area and a peripheral area, with the peripheral area surrounding the central area; On a projection plane perpendicular to the stacking direction of the cover body and the insulating component, the projection of the injection hole is located in the middle region, and the diversion rib is located in the peripheral region.

22. A battery device, characterized in that, include: Battery box; and The battery cell as described in any one of claims 1 to 19, wherein the battery cell is disposed within the battery case.

23. An electrical appliance, characterized in that, It includes a battery cell as described in any one of claims 1 to 19, or a battery device as described in claim 22.

Images