Battery monomer, end cover, battery device and power utilization device

Abstract

The utility model discloses a battery monomer, an end cover, a battery device and a power utilization device. The battery monomer comprises an electrode assembly, a shell and an end cover, the electrode assembly is arranged in the shell, and the shell is provided with an opening; the end cover is arranged at the opening of the shell, the end cover comprises a cover body and a liquid dropping pipeline arranged on the side, facing the shell, of the cover body, the cover body is provided with a liquid injection hole, the liquid dropping pipeline extends in the length direction of the cover body and communicates with the liquid injection hole, and the liquid dropping pipeline is provided with a plurality of liquid dropping holes distributed at intervals in the length direction. The electrolyte can uniformly flow to each area in the shell from the liquid dropping holes, so that the electrolyte can be conveniently diffused and rapidly infiltrated into the electrode assembly, the liquid injection efficiency is improved, and meanwhile, the electrolyte can be prevented from scouring the tab towards a certain fixed direction to a certain extent to cause serious overlook of the tab area.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery cell, an end cap, a battery device, and an electrical device. Background Art

[0002] In recent years, with the rapid development of new energy technologies, new energy vehicles have been increasingly widely used and gradually replaced traditional fuel vehicles to become one of the mainstream means of transportation. As the power source of new energy vehicles, power batteries are one of the core components of new energy vehicles. Therefore, the safety performance of power batteries has become the focus of people's attention.

[0003] In the development of battery technologies, how to improve the liquid injection efficiency of battery cells is a research direction in battery technologies. Summary of the Utility Model

[0004] Embodiments of the present application provide a battery cell, an end cap, a battery device, and an electrical device, which can improve the liquid injection efficiency of the battery cell.

[0005] In a first aspect, embodiments of the present application provide a battery cell, which includes an electrode assembly, a housing, and an end cap. The electrode assembly is disposed inside the housing, and the housing is provided with an opening; the end cap is provided at the opening of the housing. The end cap includes a cap body and a drip pipe disposed on a side of the cap body facing the housing. The cap body is provided with a liquid injection hole. The drip pipe extends along the length direction of the cap body and is communicated with the liquid injection hole. A plurality of drip holes are arranged at intervals along the length direction of the drip pipe.

[0006] In the above solution, since the drip pipe extends along the length direction of the cap body, and the plurality of drip holes on the drip pipe are arranged at intervals along the length direction, when injecting electrolyte into the housing through the liquid injection hole, the electrolyte will uniformly flow from the drip holes to each area inside the housing, facilitating the diffusion of the electrolyte and quickly wetting the electrode assembly, thereby improving the liquid injection efficiency. At the same time, it can also prevent the electrolyte from flushing the tab in a certain fixed direction to a certain extent, causing serious overlooking in the tab area.

[0007] In some embodiments, the orthographic projection of the drip pipe on the cap body and the orthographic projection of the liquid injection hole on the cap body at least partially overlap, which can simplify the structure and enable the electrolyte to be directly injected into the drip pipe after passing through the liquid injection hole, further improving the liquid injection efficiency.

[0008] In some embodiments, the drip pipe includes a pipe body and a connecting member. The pipe body extends along the length direction, and the drip holes are provided on the pipe body; the connecting member is provided on the pipe body, and the connecting member is detachably connected to the cap body.

[0009] In the above solution, the detachable connection between the connecting piece and the cover body improves the disassembly and assembly efficiency of the liquid dripping pipe and the cover body, is convenient for separate maintenance and replacement, and reduces costs.

[0010] In some embodiments, the connecting piece includes a first connecting portion, and the first connecting portion is connected to the liquid injection hole on the circumferential side.

[0011] In the above solution, after passing through the liquid injection hole, the electrolyte is directly injected into the pipe body through the first connecting portion, which simplifies the structure and further improves the liquid injection efficiency.

[0012] In some embodiments, the connecting piece includes a second connecting portion detachably connected to the cover body, and the second connecting portion is arranged at the end of the pipe body along the length direction.

[0013] In the above solution, the second connecting portion located at the end of the pipe body is connected to the cover body, which improves the connection stability between the liquid dripping pipe and the cover body.

[0014] In some embodiments, the connecting piece is snap-connected to the cover body, which is convenient for disassembly and assembly.

[0015] In some embodiments, the electrode assembly is in a wound form, the electrode assembly includes a corner region and a flat region, and the density of the liquid dripping holes corresponding to the corner region is greater than the density of the liquid dripping holes corresponding to the flat region.

[0016] In the above solution, by increasing the density of the liquid dripping holes corresponding to the corner region of the electrode assembly, the infiltration effect of the corner region can be improved, and the problem of purple spots appearing in the corner region can be reduced.

[0017] In some embodiments, the end cover further includes a pressure relief mechanism and a protection mechanism arranged on the cover body, and the protection mechanism is arranged on the side of the pressure relief mechanism facing the housing.

[0018] In the above solution, the protection mechanism can increase the gap between the tab and the pressure relief mechanism, protect the pressure relief mechanism, and prevent the tab from directly overlapping the pressure relief mechanism to a certain extent.

[0019] In some embodiments, the liquid dripping pipe passes through the protection mechanism, and no liquid dripping holes are arranged in the part of the liquid dripping pipe inside the protection mechanism.

[0020] In the above solution, by passing the liquid dripping pipe through the protection mechanism, the internal structure of the housing can be made more compact, and the energy density of the battery cell can be improved. By not arranging liquid dripping holes in the part of the liquid dripping pipe corresponding to the protection mechanism, the electrolyte can be prevented from entering the pressure relief mechanism.

[0021] In a second aspect, an embodiment of the present application further provides an end cap, which includes a cap body and a liquid dripping pipe. The cap body is provided with a liquid injection hole; the liquid dripping pipe is arranged on one side of the cap body facing the housing of the battery cell, extends along the length direction of the cap body, and is communicated with the liquid injection hole. A plurality of dripping holes are arranged at intervals along the length direction of the liquid dripping pipe.

[0022] In a third aspect, an embodiment of the present application further provides a battery device, which includes the battery cell of any one of the above embodiments.

[0023] In a fourth aspect, an embodiment of the present application further provides an electrical device, which includes the above battery device, and the battery device is used to provide electrical energy.

[0024] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically described below. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0027] Figure 2 It is an exploded view of a battery device according to some embodiments of the present application;

[0028] Figure 3 It is a schematic structural diagram of a battery module according to some embodiments of the present application;

[0029] Figure 4 It is an exploded structural diagram of a battery cell according to some embodiments of the present application;

[0030] Figure 5 It is a schematic structural diagram of an end cap according to some embodiments of the present application;

[0031] Figure 6 It is a schematic structural diagram of a liquid dripping pipe according to some embodiments of the present application;

[0032] Figure 7 It is a schematic structural diagram of an electrode assembly according to some embodiments of the present application;

[0033] Figure 8It is a schematic structural diagram of an end cap according to other embodiments of the present application;

[0034] Figure 9 It is a side view of an end cap according to some embodiments of the present application.

[0035] Explanation of reference numerals:

[0036] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, upper cover; 30, box body; 31, bottom plate; 32, side wall; 400, battery module; 20, battery cell; 22, housing; 21, end cap; 23, electrode assembly; 231, corner area; 232, flat area; 26, electrode terminal; 50, cover body; 51, liquid injection hole; 52, top cover; 53, insulating part; 54, pressure relief mechanism; 55, protection mechanism; 60, drip pipe; 61, drip hole; 62, pipe body; 63, connecting part; 631, first connecting part; 632, second connecting part; X, length direction; Y, thickness direction; Detailed implementation manners

[0037] The following further describes in detail the implementation manners of the present application with reference to the drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principle of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0038] In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0039] Referring to "embodiments" in the present application means that the specific features, structures or characteristics described in combination with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0040] The directional terms used in the following description are all the directions shown in the figures and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0041] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of the present application do not limit this either. Generally, the battery cells are divided into three types according to the encapsulation method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application do not limit this either.

[0042] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0043] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties.

[0044] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0045] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0046] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0047] The embodiments of the present application provide an electrical device using a battery as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0048] For the convenience of description, in the following embodiments, an electrical device in an embodiment of the present application is taken as an example of a vehicle 1000 for description.

[0049] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of a vehicle provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 can 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, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0050] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0051] Please refer to Figure 2 , Figure 2 , which is an exploded view of a device provided in some embodiments of the present application. The battery device 100 includes a battery box body and battery cells 20. In some embodiments, the battery box body can include an upper cover 10 and a box body 30. The upper cover 10 and the box body 30 are covered with each other, and the upper cover 10 and the box body 30 jointly define a receiving cavity for receiving the battery cells 20. The box body 30 can be a hollow structure with one end open, and the upper cover 10 can be a plate-like structure. The upper cover 10 is covered on the open side of the box body 30 so that the upper cover 10 and the box body 30 jointly define the receiving cavity; the upper cover 10 and the box body 30 can also both be hollow structures with one side open, and the open side of the upper cover 10 is covered on the open side of the box body 30. Of course, the battery box body formed by the upper cover 10 and the box body 30 can be of various shapes, such as a cylinder, a cuboid, etc.

[0052] Figure 3Schematic structural diagram of a battery module according to some embodiments of the present application. In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells 20 is accommodated in a box; of course, the battery device 100 can also be such that multiple battery cells 20 are first connected in series, in parallel, or in a combined series-parallel connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in a box. The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing electrical connection among the multiple battery cells 20.

[0053] Among them, each battery cell 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0054] Please refer to Figure 4 , Figure 4 Schematic exploded view of a battery cell provided by some embodiments of the present application. A battery cell 20 refers to the smallest unit that makes up a battery. The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0055] The end cap 21 refers to a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the housing 22 to cooperate with the housing 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 21 is not easily deformed when being squeezed or collided, so that the battery cell 20 can have higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 26 can be provided on the end cap 21. The electrode terminals 26 can be used for electrically connecting with the electrode assembly 23 to output or input the electrical energy of the battery cell 20. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold can also be provided on the end cap 21. The material of the end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating member can be provided on the inner side of the end cap 21. The insulating member can be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0056] The electrolyte is an important component of the battery cell. Generally, the electrolyte is injected into the interior of the housing through the liquid injection hole on the end cap, enabling the electrode liquid to infiltrate into the electrode plates, participate in chemical reactions, and achieve the conversion between chemical energy and electrical energy. Since the electrolyte needs to gradually diffuse in all directions to infiltrate the electrode plates after passing through the liquid injection hole, the liquid injection efficiency is low, the diffusion of the electrolyte is difficult, the infiltration effect of the electrode plates is not good, and the electrolyte flushes the tab in one direction, making it extremely easy for the tab in this area to be damaged when viewed from above, affecting its current-carrying capacity.

[0057] To solve the above technical problems, an embodiment of the present application provides a battery cell. The battery cell includes an electrode assembly, a housing, and an end cap. The electrode assembly is disposed inside the housing, and the housing is provided with an opening; the end cap is provided at the opening of the housing. The end cap includes a cap body and a drip pipe disposed on the side of the cap body facing the housing. The cap body is provided with a liquid injection hole. The drip pipe extends along the length direction of the cap body and is communicated with the liquid injection hole. A plurality of drip holes are arranged at intervals along the length direction of the drip pipe. The electrolyte will flow uniformly from the drip holes to various regions inside the housing, facilitating the diffusion of the electrolyte, quickly infiltrating the electrode assembly, improving the liquid injection efficiency. At the same time, it can also prevent the electrolyte from flushing the tab in a certain fixed direction to a certain extent, causing serious damage to the tab area when viewed from above.

[0058] In a first aspect, an embodiment of the present application provides a battery cell 20. The battery cell 20 includes an electrode assembly 23, a housing 22, and an end cap 21. The electrode assembly 23 is disposed inside the housing 22, and the housing 22 is provided with an opening; the end cap 21 is provided at the opening of the housing 22.

[0059] Figure 5 It is a schematic structural diagram of the end cap in some embodiments of the present application.

[0060] As Figure 5 shown, the end cap 21 includes a cap body 50 and a drip pipe 60 disposed on the side of the cap body 50 facing the housing 22. The cap body 50 is provided with a liquid injection hole 51. The drip pipe 60 extends along the length direction X of the cap body 50 and is communicated with the liquid injection hole 51. A plurality of drip holes 61 are arranged at intervals along the length direction X of the drip pipe 60.

[0061] The cap body 50 may include a top cover 52 and an insulating member 53. The insulating member 53 is disposed on the side of the top cover 52 facing the housing 22. The drip pipe 60 is disposed on the side of the insulating member 53 facing the housing 22. The insulating member 53 can reduce the risk of short circuit.

[0062] The drip pipe 60 can be integrally designed with the cover body 50. For example, the drip pipe 60 and the insulating part 53 of the cover body 50 are formed by an integral molding process. The drip pipe 60 and the cover body 50 can also be separately designed. For example, the drip pipe 60 and the cover body 50 are detachably connected by means of snap connection or thread. If the drip pipe 60 and the insulating part 53 are integrally designed, the cross-section of the drip pipe 60 can be in the shape of a semicircle, an arc, a U-shape, etc. If the drip pipe 60 and the cover body 50 are separately designed, the cross-section of the drip pipe 60 can be in the shape of a circle, a rectangle or a square, etc.

[0063] The drip pipe 60 can be located below the liquid injection hole 51 and directly communicate with the liquid injection hole 51; or the drip pipe 60 is located at other positions, and the drip pipe 60 communicates with the liquid injection hole 51 through other structures.

[0064] The drip hole 61 can be arranged at the bottom of the drip pipe 60, and the drip hole 61 can be in the shape of a circle, an ellipse, a rectangle or a square, etc. A plurality of drip holes 61 can be arranged at uniform intervals, or the number or area of the drip holes 61 can be increased in a certain area according to requirements.

[0065] In the above solution, since the drip pipe 60 extends along the length direction X of the cover body 50, and a plurality of drip holes 61 on the drip pipe 60 are arranged at intervals along the length direction X, when the electrolyte is injected into the housing 22 through the liquid injection hole 51, the electrolyte will evenly flow from the drip holes 61 to each area inside the housing 22, which is convenient for the diffusion of the electrolyte, quickly infiltrates the electrode assembly 23, improves the liquid injection efficiency, and at the same time, can also prevent the electrolyte from flushing the tab in a certain fixed direction to a certain extent, causing serious corrosion in the tab area.

[0066] In some embodiments, the orthographic projection of the drip pipe 60 on the cover body 50 and the orthographic projection of the liquid injection hole 51 on the cover body 50 at least partially overlap.

[0067] That is to say, the drip pipe 60 is located below the liquid injection hole 51. Among them, the drip pipe 60 can be located directly below the liquid injection hole 51, or the drip pipe 60 and the liquid injection hole 51 can be slightly misaligned. There is no need for other connection structures between the drip pipe 60 and the liquid injection hole 51, and they are directly connected.

[0068] In the above solution, by making the orthographic projection of the drip pipe 60 on the cover body 50 and the orthographic projection of the liquid injection hole 51 on the cover body 50 at least partially overlap, the structure can be simplified, and at the same time, the electrolyte can be directly injected into the drip pipe 60 after passing through the liquid injection hole 51, further improving the liquid injection efficiency.

[0069] Figure 5 It is a schematic structural diagram of an end cover in some embodiments of the present application;Figure 6 It is a schematic structural diagram of a drip pipe in some embodiments of the present application.

[0070] Please refer to Figure 5 and Figure 6 , in some embodiments, the drip pipe 60 includes a pipe body 62 and a connecting member 63. The pipe body 62 extends along the length direction X, and the drip holes 61 are provided on the pipe body 62; the connecting member 63 is provided on the pipe body 62, and the connecting member 63 is detachably connected to the cover body 50.

[0071] The connecting member 63 can be a connecting pipe extending along the thickness direction Y of the end cover 21, or the connecting member 63 can also be in the form of a connecting disc, and the communication between the pipe body 62 and the liquid injection hole 51 is realized through the connecting member 63. The connecting member 63 can be connected to the cover body 50 by means of clamping, bolts, etc. If one of the cover body 50 or the drip pipe 60 is damaged, it can be repaired and replaced separately.

[0072] In the above solution, by detachably connecting the connecting member 63 with the cover body 50, the disassembly and assembly efficiency of the drip pipe 60 and the cover body 50 is improved, and it is convenient for separate repair and replacement, reducing costs.

[0073] In some embodiments, the connecting member 63 includes a first connecting portion 631, and the first connecting portion 631 is connected to the liquid injection hole 51 on the circumferential side.

[0074] A groove can be provided on the side of the first connecting portion 631 facing the end cover 21, and a protruding portion can be provided on the circumferential side of the liquid injection hole 51. By inserting the protruding portion into the groove and the protruding portion being in interference fit with the groove, the connection between the first connecting portion 631 and the cover body 50 is realized. Or a protruding portion can be provided on the first connecting portion 631, and a groove can be provided on the circumferential side of the liquid injection hole 51.

[0075] In the above solution, the electrolyte directly enters the pipe body 62 through the first connecting portion 631 after passing through the liquid injection hole 51, which simplifies the structure and further improves the liquid injection efficiency.

[0076] In some embodiments, the connecting member 63 includes a second connecting portion 632 detachably connected to the cover body 50, and the second connecting portion 632 is provided at the end of the pipe body 62 along the length direction X.

[0077] The second connecting portion 632 can be provided at both ends of the pipe body 62 along the length direction X, or the second connecting portion 632 can also be provided only at one end of the pipe body 62 along the length direction X. The connection manner of the second connecting portion 632 with the cover body 50 can refer to the first connecting portion 631, which will not be elaborated here.

[0078] In the above solution, the second connecting portion 632 located at the end of the pipe body 62 is connected to the cover body 50, improving the connection stability between the dripping pipe 60 and the cover body 50.

[0079] In some embodiments, the connecting member 63 is snap-connected to the cover body 50, facilitating disassembly and assembly.

[0080] Figure 7 It is a schematic structural diagram of an electrode assembly according to some embodiments of the present application.

[0081] As Figure 7 shown, in some embodiments, the electrode assembly 23 is in a wound form. The electrode assembly 23 includes a corner region 231 and a flat region 232. The density of the dripping holes 61 corresponding to the corner region 231 is greater than the density of the dripping holes 61 corresponding to the flat region 232.

[0082] The electrode assembly 23 is formed by laminating a positive electrode plate, a separator, a negative electrode plate, and a separator layer and then winding and compressing them. Therefore, the region where the electrode assembly 23 is bent at the winding corner is the corner region 231, and the region where it is not bent is the flat region 232. Since the outer ring of the wound electrode assembly 23 is less restricted by force, the gap in the corner region 231 is larger. It is difficult for the electrolyte to enter the corner region 231, the infiltration rate is slow, and when the infiltration effect is not good, there is an easy problem of purple spots at the corners in the full charge interface.

[0083] "The density of the dripping holes 61 corresponding to the corner region 231 is greater than the density of the dripping holes 61 corresponding to the flat region 232" means that: the density of the dripping holes 61 above the corner region 231 is greater than the density of the dripping holes 61 above the flat region 232, and the density is adjusted by increasing the number of dripping holes 61 or reducing the spacing between adjacent dripping holes 61.

[0084] In the above solution, by increasing the density of the dripping holes 61 corresponding to the corner region 231 of the electrode assembly 23, the infiltration effect of the corner region 231 can be improved, and the problem of purple spots in the corner region 231 can be reduced.

[0085] Figure 8 It is a schematic structural diagram of an end cover according to other embodiments of the present application; Figure 9 It is a side view of an end cover according to some embodiments of the present application.

[0086] Please refer to Figure 8 and Figure 9 , in some embodiments, the end cover 21 further includes a pressure relief mechanism 54 and a protection mechanism 55 provided on the cover body 50, and the protection mechanism 55 is provided on the side of the pressure relief mechanism 54 facing the housing 22.

[0087] The protection mechanism 55 is located below the pressure relief mechanism 54. The pressure relief mechanism 54 is equivalent to a heightening mechanism that can separate the pressure relief mechanism 54 from the tab of the electrode assembly 23.

[0088] In the above solution, the protection mechanism 55 can increase the gap between the tab and the pressure relief mechanism 54, protect the pressure relief mechanism 54, and prevent the tab from directly overlapping the pressure relief mechanism 54 to a certain extent.

[0089] In some embodiments, the liquid dripping pipe 60 passes through the protection mechanism 55, and the part of the liquid dripping pipe 60 inside the protection mechanism 55 is not provided with liquid dripping holes 61.

[0090] In the above solution, by passing the liquid dripping pipe 60 through the protection mechanism 55, the structure inside the housing 22 can be made more compact, and the energy density of the battery cell 20 can be increased. By not providing liquid dripping holes 61 in the part of the liquid dripping pipe 60 corresponding to the protection mechanism 55, the electrolyte can be prevented from entering the pressure relief mechanism 54.

[0091] In a second aspect, an end cap 21 provided by an embodiment of the present application includes a cap body 50 and a liquid dripping pipe 60. The cap body 50 is provided with a liquid injection hole 51; the liquid dripping pipe 60 is arranged on one side of the cap body 50 facing the housing 22 of the battery cell 20, the liquid dripping pipe 60 extends along the length direction X of the cap body 50, and is communicated with the liquid injection hole 51. The liquid dripping pipe 60 is provided with a plurality of liquid dripping holes 61 arranged at intervals along the length direction X.

[0092] In a third aspect, a battery device 100 provided by an embodiment of the present application includes the battery cell 20 of any of the above embodiments.

[0093] In a fourth aspect, an electrical device provided by an embodiment of the present application includes the above battery device 100, and the battery device 100 is used to provide electrical energy.

[0094] According to some embodiments of the present application, a battery cell 20 is provided. The battery cell 20 includes an electrode assembly 23, a housing 22, and an end cap 21. The electrode assembly 23 is arranged inside the housing 22, and the housing 22 is provided with an opening; the end cap 21 is provided at the opening of the housing 22. The end cap 21 includes a cap body 50 and a liquid dripping pipe 60 arranged on the side of the cap body 50 facing the housing 22. The cap body 50 is provided with a liquid injection hole 51. The liquid dripping pipe 60 extends along the length direction X of the cap body 50 and is communicated with the liquid injection hole 51. The liquid dripping pipe 60 is provided with a plurality of liquid dripping holes 61 arranged at intervals along the length direction X. The orthographic projection of the liquid dripping pipe 60 on the cap body 50 and the orthographic projection of the liquid injection hole 51 on the cap body 50 at least partially overlap.

[0095] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: An electrode assembly; A housing, wherein the electrode assembly is disposed inside the housing, and the housing is provided with an opening; An end cap, which is provided at the opening of the housing. The end cap includes a cap body and a liquid dripping pipe disposed on a side of the cap body facing the housing. The cap body is provided with a liquid injection hole. The liquid dripping pipe extends along the length direction of the cap body and communicates with the liquid injection hole. The liquid dripping pipe is provided with a plurality of spaced-apart liquid dripping holes along the length direction.

2. The battery cell according to claim 1, wherein, The orthographic projection of the liquid dripping pipe on the cap body at least partially overlaps with the orthographic projection of the liquid injection hole on the cap body.

3. The battery cell according to claim 1, characterized in that The liquid dripping pipe includes: A pipe body; extending along the length direction, and the liquid dripping holes are disposed on the pipe body; A connecting member, which is disposed on the pipe body, and the connecting member is detachably connected to the cap body.

4. The battery cell according to claim 3, wherein The connecting member includes a first connecting portion, and the first connecting portion is connected to the liquid injection hole on the circumferential side.

5. The battery cell according to claim 3, characterized in that, The connecting member includes a second connecting portion detachably connected to the cap body, and the second connecting portion is disposed at an end of the pipe body along the length direction.

6. The battery cell according to claim 3, characterized in that, The connecting member is snap-connected to the cap body.

7. The battery cell according to claim 1, characterized in that, The electrode assembly is in a wound form, and the electrode assembly includes a corner region and a flat region. The density of the liquid dripping holes corresponding to the corner region is greater than the density of the liquid dripping holes corresponding to the flat region.

8. The battery cell according to claim 1, wherein The end cap further includes a pressure relief mechanism and a protection mechanism disposed on the cap body, and the protection mechanism is disposed on a side of the pressure relief mechanism facing the housing.

9. The battery cell according to claim 8, wherein, The liquid dripping pipe passes through the protection mechanism, and a portion of the liquid dripping pipe inside the protection mechanism is not provided with liquid dripping holes.

10. An end cap, characterized in that, Comprising: A cap body, provided with a liquid injection hole; A liquid dripping pipe, disposed on a side of the cap body for facing the housing of the battery cell. The liquid dripping pipe extends along the length direction of the cap body and communicates with the liquid injection hole. The liquid dripping pipe is provided with a plurality of spaced-apart liquid dripping holes along the length direction.

11. A battery device, characterized in that, Comprising the battery cell according to any one of claims 1-9.

12. An electrical device, characterized in that, Comprising the battery device according to claim 11, and the battery device is used for providing electric energy.

Images