Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery cell includes a housing having an opening, an end cap, an electrolyte, an electrode assembly, and a barrier. The end cover covers the opening, and the end cover and the shell are in sealed connection to form a connecting part. The electrolyte is arranged in the shell. The electrode assembly is arranged in the shell. The blocking piece is connected with the end cover and the shell and is positioned on one side, facing the interior of the battery monomer, of the connecting part. Wherein the inner circumferential surface of the shell is provided with a first groove, and a part of the blocking piece is arranged in the first groove. The battery monomer has relatively high reliability.

Description

Technical Field

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

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

[0003] How to improve the reliability of battery cells is an urgent problem to be solved in battery technology. Summary of the Utility Model

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

[0005] In a first aspect, the present application provides a battery cell, which includes a housing, an end cap, an electrolyte, an electrode assembly, and a barrier member. The housing has an opening. The end cap covers the opening, and the end cap and the housing are hermetically connected to form a connection portion. The electrolyte is disposed inside the housing. The electrode assembly is disposed inside the housing. The barrier member connects the end cap and the housing and is located on a side of the connection portion facing the inside of the battery cell. Wherein, a first groove is provided on the inner peripheral surface of the housing, and a part of the barrier member is disposed in the first groove.

[0006] In the technical solution of the embodiment of the present application, since a part of the barrier member is disposed in the first groove, the barrier member and the housing have a large contact area, strong adhesion, a low risk of connection failure between the barrier member and the housing, a low risk of seal failure between the end cap and the housing, and a low risk of electrolyte leakage. Therefore, the battery cell has high reliability.

[0007] In one or more embodiments of the first aspect, a plurality of first grooves are provided, and the plurality of first grooves are spaced along the circumferential direction of the housing.

[0008] In the above solution, since a plurality of first grooves are provided, the contact area between the barrier member and the housing can be further increased, the risk of electrolyte leakage can be further reduced, and thus the reliability of the battery cell can be further improved.

[0009] In one or more embodiments of the first aspect, the end cap has a first connection surface, the housing has a second connection surface, the first connection surface and the second connection surface are disposed opposite to each other and connected to form a connection portion, and a part of the barrier member is disposed between the first connection surface and the second connection surface.

[0010] In the above solution, a part of the blocking member is disposed between the first connection surface and the second connection surface, reducing the probability of electrolyte entering between the first connection surface and the second connection surface, alleviating the corrosion problem of the connection part by the electrolyte, thereby improving the reliability of the connection part, reducing the risk of electrolyte leakage, and further improving the reliability of the battery cell.

[0011] In one or more embodiments of the first aspect, along the thickness direction of the end cap, the first groove is spaced apart from the connection part.

[0012] In the above solution, since along the thickness direction of the end cap, the first groove is spaced apart from the connection part, the risk of increasing the probability of defects in the connection part caused by the setting of the first groove during the formation of the connection part can be reduced.

[0013] In one or more embodiments of the first aspect, along the thickness direction of the end cap, the first groove is located on the side of the end cap facing the inside of the battery cell.

[0014] In the above solution, since along the thickness direction of the end cap, the first groove is located on the side of the end cap facing the inside of the battery cell, the risk of increasing the probability of defects in the connection part caused by the setting of the first groove during the formation of the connection part can be further reduced.

[0015] In one or more embodiments of the first aspect, along the thickness direction of the end cap, the first groove has a first end close to the connection part and a second end far from the connection part. From the first end to the second end, the groove depth of the first groove gradually increases first and then gradually decreases.

[0016] In the above solution, since from the first end close to the connection part to the second end far from the connection part, the groove depth of the first groove gradually increases first and then gradually decreases, during the process of the housing deforming under force, the blocking member disposed in the first groove deforms with the housing to a relatively small extent, the risk of fatigue failure is relatively low, and the reliability of the battery cell is relatively high.

[0017] In one or more embodiments of the first aspect, the end cap has a first surface facing the inside of the battery cell. The blocking member includes a first part, a second part, and a third part connected to each other. The first part is disposed between the first connection surface and the second connection surface, the second part is attached to the inner peripheral surface of the housing and a part of the second part is located in the first groove, and the third part is attached to the first surface.

[0018] In the above solution, the blocking member includes three parts connected to each other at different positions, which can further increase the area of the connection interface of the blocking member, further increase the adhesion of the blocking member, and further reduce the risk of failure of the blocking member, thereby further improving the reliability of the battery cell.

[0019] In one or more embodiments of the first aspect, the second part has a root connected to the third part and a free end away from the third part, and the thickness of the free end is greater than the thickness of the root.

[0020] In the above solution, the root is closer to the joint surface of the end cap and the housing than the free end. During the process of the housing deforming under force, due to the greater thickness of the free end, the adhesion is stronger. At the same time, the thickness of the root is smaller, and the risk of cracking is relatively low. The reliability of the battery cell is higher.

[0021] In one or more embodiments of the first aspect, the battery cell further includes an insulating member. Along the thickness direction of the end cap, the insulating member is located between the electrode assembly and the end cap, and the blocking member is located between the outer peripheral surface of the insulating member and the inner peripheral surface of the housing.

[0022] In the above solution, the blocking member located between the outer peripheral surface of the insulating member and the inner peripheral surface of the housing can achieve a certain sealing effect. On the one hand, it can reduce the volume of the blocking member, improve the energy density of the battery cell, and on the other hand, it can reduce the cost.

[0023] In one or more embodiments of the first aspect, the blocking member is connected to the outer peripheral surface of the insulating member.

[0024] In the above solution, in addition to the part of the blocking member disposed in the first groove, the blocking member is also connected to the outer peripheral surface of the insulating member, which can further increase the area of the connection interface of the blocking member, improve the adhesion of the blocking member, and reduce the risk of the blocking member failing.

[0025] In one or more embodiments of the first aspect, the end cap has a first surface facing the inside of the battery cell and a second surface facing away from the inside of the battery cell, and an outer peripheral surface connecting the first surface and the second surface. The first connection surface is the outer peripheral surface of the end cap; a part of the inner peripheral surface of the housing forms the second connection surface.

[0026] In the above solution, at least a part of the end cap extends into the housing, so that the outer peripheral surface of the end cap can be connected and fixed to the inner peripheral surface of the housing, thereby forming a connection part. At this time, the first connection surface is the outer peripheral surface of the end cap, and the second connection surface is a part of the inner peripheral surface of the housing.

[0027] In one or more embodiments of the first aspect, the housing has an end face connecting the inner peripheral surface and the outer peripheral surface of the housing, the second connection surface is the end face, and the end cap has a first surface facing the inside of the battery cell, and a part of the first surface forms the first connection surface.

[0028] In the above solution, at least the part of the end cover connected to the housing does not extend into the housing, but is directly connected and fixed to the end face of the housing, thereby forming a connection part. At this time, the end face of the housing close to the opening is the second connection face, and a part of the side face of the end cover close to the inside of the housing in the thickness direction (i.e., the first surface of the end cover facing the inside of the battery cell) is the first connection face.

[0029] In one or more embodiments of the first aspect, the end cover has a first surface facing the inside of the battery cell, and at least part of the edge region of the first surface is configured as a guiding inclined surface.

[0030] In the above solution, when the end cover is located on the lower side of the battery cell and the battery cell is heated, the blocking material is blocked from melting, and the molten blocking material can flow downward through the guiding inclined surface under the action of gravity and move to between the first connection face and the second connection face.

[0031] In one or more embodiments of the first aspect, the end cover further has a second surface facing away from the inside of the battery cell, and an outer peripheral surface connecting the first surface and the second surface. The included angle formed between the guiding inclined surface and the outer peripheral surface of the end cover is an obtuse angle.

[0032] In the above solution, since the included angle formed between the guiding inclined surface and the outer peripheral surface of the end cover is an obtuse angle, on the one hand, the molten blocking material can flow more smoothly, so that the blocking member can more fully fill the gap between the first connection face and the second connection face. On the other hand, the molten blocking material has sufficient flow velocity, which improves the efficiency of the blocking member flowing to between the first connection face and the second connection face, that is, improves the assembly efficiency of the blocking member.

[0033] In one or more embodiments of the first aspect, the guiding inclined surface is arranged around the end cover and forms an annular region.

[0034] In the above solution, when the battery cell is heated, the blocking material initially located in the first groove can move more uniformly to between the first connection face and the second connection face, thereby forming the blocking member of the present application and improving the sealing performance between the end cover and the housing.

[0035] In one or more embodiments of the first aspect, the end cover further includes a second surface facing away from the inside of the battery cell, and the outer peripheral surface of the end cover connecting the first surface and the second surface. A second groove is provided in the edge region of the first surface, one end of the second groove extends to the outer peripheral surface of the end cover, and at least part of the bottom wall of the second groove is configured as a guiding inclined surface.

[0036] In the above solution, the second groove can introduce the molten barrier material between the first connection surface and the second connection surface. The second groove can store a certain amount of molten barrier material. Therefore, the height of the area coated with the barrier material in the area on the inner circumferential surface of the housing opposite to the second groove is greater than that of other areas where the barrier material coats the inner circumferential surface of the housing, thereby improving the sealing effect between the end cover and the housing to at least a certain extent.

[0037] In the area on the inner circumferential surface of the housing that is not opposite to the second groove, there is a gap communicating with the second groove between it and the end cover. The molten material flowing out of the second groove coats the area on the inner circumferential surface of the housing that is not opposite to the second groove through this gap.

[0038] Since the edge area of the first surface is not entirely an inclined surface, the flow of the molten material is more concentrated, and the molten material is more likely to reach between the first connection surface and the second connection surface through the second groove. The probability of the situation where the molten material is not easily flowed between the first connection surface and the second connection surface due to the overall excessive edge area of the first surface is reduced.

[0039] In one or more embodiments of the first aspect, there are multiple second grooves, and the multiple second grooves are arranged at intervals along the circumferential direction of the end cover.

[0040] In the above solution, after the barrier material melts, the molten material can flow evenly between the first connection surface and the second connection surface, improving the sealing uniformity between the end cover and the inner circumferential surface of the housing. Of course, by arranging multiple second grooves on the edge area of the first surface, the material used for the end cover can be further reduced, and the manufacturing cost of the end cover can be reduced.

[0041] In one or more embodiments of the first aspect, the first surface is further provided with a third groove, and the third groove is arranged at one end of the second groove away from the outer circumferential surface of the end cover and communicates with the second groove.

[0042] In the above solution, the initial barrier material can also be stored in the third groove, and the thickness of the barrier material in the third groove is greater than that of the barrier material in other areas of the first surface. Therefore, after the battery cell is heated, the amount of the molten material in the third groove after melting can support its flow to between the first connection surface and the second connection surface, so that the end cover and the housing have good sealing performance.

[0043] Of course, by arranging the third groove, the material used for the end cover can be further reduced, and the manufacturing cost of the end cover can be reduced.

[0044] In one or more embodiments of the first aspect, the third groove is an annular groove extending along the circumferential direction of the first surface.

[0045] In the above solution, the part of the initial blocking material in the third groove can have a sufficient amount of material after melting, and then can flow circumferentially between the first joint surface and the second joint surface, so as to further improve the sealing performance between the end cover and the housing.

[0046] In one or more embodiments of the first aspect, the blocking member is made of an insulating material.

[0047] In the above solution, since the blocking member is made of an insulating material, the risk of short - circuiting the battery cell caused by setting the blocking member can be reduced.

[0048] In one or more embodiments of the first aspect, the melting point of the blocking member is greater than or equal to 85 °C and less than or equal to 120 °C.

[0049] In the above solution, on the one hand, the blocking member can melt when the battery cell is heated, so that the melted blocking material can seal the end cover and the housing. On the other hand, the blocking member will not melt due to too low a melting point during normal use of the battery cell, improving the stability of the blocking member.

[0050] In one or more embodiments of the first aspect, the blocking member includes one of paraffin wax, rosin, PE wax, polyolefin, stearic acid, and white oil.

[0051] In the above solution, the blocking member can melt after the battery cell is heated, and the melted blocking material can flow to seal the end cover and the housing, improving the reliability of the battery cell.

[0052] In a second aspect, the present application provides a battery device, which includes the battery cell in one or more of the above - mentioned embodiments.

[0053] In the above solution, since the battery cell in one or more of the above - mentioned embodiments has high reliability, the battery device including the battery cell in one or more of the above - mentioned embodiments also has high reliability.

[0054] In one or more embodiments of the second aspect, the end cover is located below the housing along the direction of gravity.

[0055] In the above solution, since the end cover is located below the housing along the direction of gravity, the risk that the electrolyte flows to the connecting part under the action of gravity and corrodes the connecting part is relatively high, that is, the risk of electrolyte leakage is relatively high. Setting the blocking member can significantly reduce the risk of electrolyte leakage, so that the battery cell has high reliability.

[0056] In a third aspect, the present application provides an electrical device, which includes the battery cell in one or more of the above - mentioned embodiments, or the battery device in one or more of the above - mentioned embodiments; the battery cell or the battery device is used to provide electrical energy.

[0057] In the above solution, since the battery cell or battery device in one or more of the above embodiments has high reliability, the electrical device including the battery cell or battery device in one or more of the above embodiments also has high reliability.

[0058] 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 other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0060] Figure 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0061] Figure 2 is an exploded view of a battery device according to some embodiments of the present application;

[0062] Figure 3 is an exploded view of a battery cell according to some embodiments of the present application;

[0063] Figure 4 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0064] Figure 5 is Figure 4 a partial enlarged view of part A in;

[0065] Figure 6 is a schematic diagram of a part of the housing according to some embodiments of the present application;

[0066] Figure 7 is a schematic structural diagram of a blocking member according to some embodiments of the present application;

[0067] Figure 8 is a cross-sectional view of a part of the structure of a battery cell according to some other embodiments of the present application;

[0068] Figure 9 is Figure 8 a partial enlarged view of part B in;

[0069] Figure 10 is an axonometric view of the housing according to some embodiments of the present application;

[0070] Figure 11 is an axonometric view of an end cap according to some other embodiments of the present application;

[0071] Figure 12 For Figure 11 The partial enlarged view at position C in

[0072] The reference numerals in the specific embodiments are as follows:

[0073] 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery device; 11 - box body; 111 - first box body; 112 - second box body; 12 - battery cell; 121 - outer shell; 1211 - end cover; 12111 - first surface; 12112 - second surface; 12113 - outer peripheral surface of the end cover; 12114 - guiding inclined surface; 1212 - housing; 12121 - end face; 122 - electrode assembly; 123 - electrode terminal; 124 - adapter plate; 125 - insulating part; 126 - blocking part; 1261 - first part; 1262 - second part; 12621 - root; 12622 - free end; 1263 - third part; 127 - first groove; 1271 - first end; 1272 - second end; 128 - first connection surface; 129 - second connection surface; 130 - connection part; 131 - second groove; 132 - third groove. Specific embodiments

[0074] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0075] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0076] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means more than two unless otherwise specifically defined.

[0077] Reference to "embodiments" in this application means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and 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 will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0078] In the description of the embodiments of this application, the term "plurality" means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0079] In this application, the shape of the battery cell may include, but is not limited to, a cylinder, a flat body, a cuboid, or other shapes, etc. The battery cells may include, but are not limited to, cylindrical battery cells, square battery cells, soft-pack battery cells, and blade battery cells according to the packaging method.

[0080] In some high-power application scenarios such as electric vehicles, etc., the application of the battery device includes three levels: battery cells, battery modules, and battery devices. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame to protect the battery cells from external impacts, heat, vibrations, etc. The battery device refers to the final state of the battery device system installed in an electric vehicle. The battery device mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. The battery device generally includes a box for encapsulating one or more battery cells. The box can reduce the risk of liquid or other foreign objects affecting the charging or discharging of the battery cells.

[0081] The battery device (Battery Apparatus) mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (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.

[0082] In some embodiments, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module (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.

[0083] In some embodiments, the battery device may be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0084] As an example, the battery cell assembly may 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.

[0085] 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.

[0086] In the following, the description will mainly focus on prismatic battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells, pouch battery cells, or blade battery cells in some aspects.

[0087] In a common battery cell structure, the battery cell includes a housing, an electrode assembly, and an electrolyte. The housing includes an end cap and a casing, and the end cap closes the opening of the casing to define an accommodation space for accommodating the electrode assembly.

[0088] The development of battery technology needs to consider multiple design factors simultaneously. For example, performance parameters such as energy density, cycle life, discharge capacity, charge-discharge rate, etc. In addition, the reliability of the battery device also needs to be considered.

[0089] In a common battery cell structure, the battery cell includes a housing, an electrode assembly, and an electrolyte. The housing includes an end cap and a casing, and the end cap closes the opening of the casing to define an accommodation space for accommodating the electrode assembly.

[0090] The development of battery technology needs to consider multiple design factors simultaneously. For example, performance parameters such as energy density, cycle life, discharge capacity, charge-discharge rate, etc. In addition, the reliability of the battery device also needs to be considered.

[0091] After the end cap and the casing of a common battery cell are connected, the sealing performance is poor, and the risk of electrolyte leakage from the gap between the end cap and the casing is relatively high. Based on this, a seal is generally provided inside the battery cell to seal the above gap. However, during the deformation of the housing, the risk of seal connection failure is relatively high. Once the seal connection fails, the risk of electrolyte leakage will increase significantly. Therefore, the reliability of the above battery cell is poor.

[0092] In view of this, the present application provides a battery cell, which includes a housing, an end cap, an electrolyte, an electrode assembly, and a barrier. The housing has an opening. The end cap covers the opening, and the end cap and the housing are sealingly connected to form a connection portion. The electrolyte is disposed inside the housing. The electrode assembly is disposed inside the housing. The barrier is connected to the end cap and the housing and is located on the side of the connection portion facing the inside of the battery cell. Wherein, a first groove is provided on the inner peripheral surface of the housing, and a part of the barrier is disposed in the first groove. Since a part of the barrier is disposed in the first groove, the barrier and the housing have a large contact area and strong adhesion, the risk of connection failure between the barrier and the housing is low, the risk of seal failure between the end cap and the housing is low, and the risk of electrolyte leakage is low. Furthermore, the battery cell has high reliability.

[0093] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices, and electrical devices using battery devices.

[0094] The electrical devices include, but are not limited to: battery cars, electric vehicles, ships, spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships, etc.

[0095] For the convenience of description, the following embodiments will take a vehicle 1000, which is an electrical device in an embodiment of the present application, as an example for illustration.

[0096] For example, Figure 1 FIG. 14 is a schematic structural diagram of a vehicle 1000 according to 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 electric vehicle, or an extended-range electric vehicle, etc. A motor 300, a controller 200, and a battery device 100 can be disposed inside the vehicle 1000. The controller 200 is used to control the power supply of the battery device 100 to the motor 300. For example, the battery device 100 can be disposed at the bottom, the front end, or the rear end of the vehicle 1000. The battery device 100 can be used for the power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power supply of the vehicle 1000 and used for the circuit system of the vehicle 1000, such as for the working power requirements during the start, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0097] To meet different power usage requirements, the battery device 100 may include a plurality of battery cells 12. Among them, the plurality of battery cells 12 may be connected in series, parallel, or in a combined series-parallel connection, and the combined series-parallel connection refers to a combination of series and parallel connections. The battery device 100 may also be referred to as a battery pack. Optionally, the plurality of battery cells 12 may first be connected in series, parallel, or in a combined series-parallel connection to form battery modules, and then the plurality of battery modules may be connected in series, parallel, or in a combined series-parallel connection to form the battery device 100. That is to say, the plurality of battery cells 12 may directly form the battery device 100, or may first form battery modules, and then the battery modules form the battery device 100.

[0098] For example, please refer to Figure 2 , Figure 2 which is an exploded view of the battery device 100 according to some embodiments of the present application. The battery device 100 may include a plurality of battery cells 12. The battery device 100 may further include a housing 11, the interior of the housing 11 is a hollow structure, and the plurality of battery cells 12 are accommodated in the housing 11. As Figure 2 shown, here they are respectively referred to as the first housing 111 and the second housing 112, and the first housing 111 and the second housing 112 are snapped together. The shapes of the first housing 111 and the second housing 112 may be determined according to the shape of the combination of the plurality of battery cells 12. The first housing 111 and the second housing 112 may each have an open face. For example, both the first housing 111 and the second housing 112 may be hollow cuboids and each has only one face as an open face. The open face of the first housing 111 and the open face of the second housing 112 are oppositely arranged, and the first housing 111 and the second housing 112 are snapped together to form a housing 11 with a closed chamber. The plurality of battery cells 12 are connected in parallel, series, or in a combined series-parallel connection and then placed in the housing 11 formed by snapping the first housing 111 and the second housing 112 together.

[0099] Optionally, the battery device 100 may further include other structures, which will not be elaborated one by one here. For example, the battery device 100 may further include a busbar component, and the busbar component is used to achieve electrical connection between the plurality of battery cells 12, such as in parallel, series, or in a combined series-parallel connection. Specifically, the busbar component may achieve electrical connection between the battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Further, the busbar component may be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of the plurality of battery cells 12 may be further led out through a conductive mechanism passing through the housing 11.

[0100] According to different power demands, the number of battery cells 12 can be set to any value. Multiple battery cells 12 can be connected in series, parallel, or a combination of both to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery device 100 may be large, for ease of installation, the battery cells 12 can be grouped, and each group of battery cells 12 forms a battery module. The number of battery cells 12 included in a battery module is not limited and can be set according to requirements. The battery device 100 can include multiple battery modules, and these battery modules can be connected in series, parallel, or a combination of both.

[0101] Please refer to Figure 3 as shown in Figure 3 which is an exploded view of the battery cell 12 according to some embodiments of the present application. The battery cell 12 includes one or more electrode assemblies 122 and a housing 121. The housing 121 can include a housing body 1212, and a cavity is formed by a plurality of wall portions of the housing body 1212, i.e., a plurality of wall portions of the housing 121, and this cavity can be used to accommodate the electrode assembly 122. The housing body 1212 is determined according to the shape after combining one or more electrode assemblies 122. For example, the housing body 1212 can be a hollow cuboid, cube, or regular polyhedron, and one of the faces of the housing body 1212 has an opening so that one or more electrode assemblies 122 can be placed inside the housing body 1212. The housing body 1212 is filled with an electrolyte, such as an electrolyte solution.

[0102] The battery cell 12 may further include two electrode terminals 123, and the two electrode terminals 123 can be disposed on the end cap 1211. The end cap 1211 is generally in a flat plate shape, and the two electrode terminals 123 are fixed on the flat surface of the end cap 1211. The two electrode terminals 123 are a positive electrode terminal and a negative electrode terminal of the battery module, respectively. A transition piece 124 is correspondingly provided for each electrode terminal 123, and it is located between the end cap 1211 and the electrode assembly 122 and is used to electrically connect the electrode assembly 122 and the electrode terminal 123. In this battery cell 12, according to actual usage requirements, the electrode assembly 122 can be set to be single or multiple, and multiple independent electrode assemblies 122 are provided inside the battery cell 12.

[0103] According to some embodiments of the present application, please refer to Figures 4 - 8, this application provides a battery cell 12, which includes a housing 1212, an end cap 1211, an electrolyte, an electrode assembly 122, and a barrier member 126. The housing 1212 has an opening. The end cap 1211 covers the opening, and the end cap 1211 and the housing 1212 are hermetically connected to form a connection portion 130. The electrolyte is disposed within the housing 1212. The electrode assembly 122 is disposed within the housing 1212. The barrier member 126 connects the end cap 1211 and the housing 1212 and is located on the side of the connection portion 130 facing the interior of the battery cell 12. Among them, a first groove 127 is provided on the inner peripheral surface of the housing 1212, and a part of the barrier member 126 is disposed within the first groove 127.

[0104] The outer casing 121 can be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum plastic film, etc.

[0105] The battery cell 12 generally includes an electrode assembly 122. The electrode assembly 122 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 12, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0106] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0107] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0108] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0109] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery device 100 can also be used.

[0110] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0111] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, etc. may be used.

[0112] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0113] As an example, the negative electrode active material may be a negative electrode active material known in the art for the battery device 100. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The silicon-based material may be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery device 100 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0114] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any known porous structure separator membrane with good chemical stability and mechanical stability may be selected.

[0115] As an example, the main material of the separator membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation. The separator may be a single component located between the positive and negative electrodes, or may be attached to the surfaces of the positive and negative electrodes.

[0116] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0117] In some embodiments, the battery cell 12 further includes an electrolyte, and the electrolyte functions to conduct ions between the positive and negative electrodes. The electrolyte may be liquid, gel, or solid. Among them, the liquid electrolyte includes electrolyte salts and solvents. The liquid electrolyte may also be referred to as an electrolyte solution.

[0118] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro(bis(oxalato))phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0119] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, lactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0120] Among them, the gel electrolyte includes a polymer as the skeleton network of the electrolyte, combined with an ionic liquid-lithium salt.

[0121] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0122] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, poly(ionic liquid)-lithium salt, cellulose, etc.

[0123] As an example, the inorganic solid electrolyte may include one or more of oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0124] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0125] In some embodiments, the electrode assembly 122 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0126] In some embodiments, the electrode assembly 122 is a stacked structure.

[0127] The first groove 127 may be a groove with the same groove depth or a groove with a gradually changing groove depth.

[0128] The shape of the first groove 127 can be linear, cross-shaped, zigzag, etc.

[0129] The blocking member 126 can be made of an insulating material. Of course, the blocking member 126 can also be made of other materials, as long as it can block the electrolyte to at least a certain extent.

[0130] In some embodiments, the side facing the inside of the battery cell 12 can also be understood as the side facing the electrode assembly 122. The side facing away from the inside of the battery cell 12 can also be understood as the side facing away from the electrode assembly 122.

[0131] The blocking member 126 connects the end cap 1211 and the housing 1212 and is located on the side of the connecting portion 130 facing the inside of the battery cell 12, which means that there is a gap between the end cap 1211 and the housing 1212, and the blocking member 126 can enter the above gap to block the contact between the electrolyte and the connecting portion 130 to a certain extent, reducing the risk of corrosion of the connecting portion 130. Of course, the blocking member 126 can also be located in the flow path of the electrolyte flowing to the connecting portion 130 to block the contact between the electrolyte and the connecting portion 130.

[0132] In the technical solution of the embodiment of the present application, since a part of the blocking member 126 is arranged in the first groove 127, there is a large contact area between the blocking member 126 and the housing 1212, the adhesion is strong, the risk of connection failure between the blocking member 126 and the housing 1212 is low, the risk of seal failure between the end cap 1211 and the housing 1212 is low, and the risk of electrode liquid leakage is low. Therefore, the battery cell 12 has high reliability.

[0133] According to some embodiments of the present application, please refer to Figures 9 - 10 , a plurality of first grooves 127 are provided, and the plurality of first grooves 127 are arranged at intervals along the circumferential direction of the housing 1212.

[0134] In some embodiments, a plurality of blocking members 126 are provided. One blocking member 126 can correspond to a plurality of first grooves 127. The plurality of blocking members 126 and the plurality of first grooves 127 can also correspond one by one, and one blocking member 126 can also correspond to all the first grooves 127.

[0135] In the above solution, since a plurality of first grooves 127 are provided, the contact area between the blocking member 126 and the housing 1212 can be further increased, the risk of electrolyte leakage can be further reduced, and thus the reliability of the battery cell 12 can be further improved.

[0136] According to some embodiments of the present application, please refer to Figures 9 - 10, the end cap 1211 has a first connection surface 128, the housing 1212 has a second connection surface 129, the first connection surface 128 and the second connection surface 129 are disposed opposite to each other and connected to form a connection portion 130, and a part of the blocking member 126 is disposed between the first connection surface 128 and the second connection surface 129.

[0137] The connection portion 130 can be formed by means of bonding, hot melting or welding.

[0138] At least a part of the blocking member 126 is disposed between the first connection surface 128 and the second connection surface 129 and is located on the side of the connection portion 130 facing the inside of the battery cell 12.

[0139] That is to say, there is inevitably a gap between the first connection surface 128 and the second connection surface 129 (even if the gap is small, the gap still exists). Therefore, at least a part of the blocking member 126 is disposed between the first connection surface 128 and the second connection surface 129, which can block the contact between the electrolyte and the connection portion 130 to a certain extent, thereby reducing the risk of corrosion of the connection portion 130.

[0140] In the above solution, a part of the blocking member 126 is disposed between the first connection surface 128 and the second connection surface 129, reducing the probability of the electrolyte entering between the first connection surface 128 and the second connection surface 129, alleviating the corrosion problem of the connection portion 130 by the electrolyte, thereby improving the reliability of the connection portion 130, reducing the risk of electrolyte leakage, and further improving the reliability of the battery cell 12.

[0141] According to some embodiments of the present application, please refer to Figures 4 - 8 , along the thickness direction of the end cap 1211, the first groove 127 is spaced apart from the connection portion 130.

[0142] Along the thickness direction of the end cap 1211, the first groove 127 is spaced apart from the connection portion 130, which means that before the formation of the connection portion 130, most of the surfaces of the end cap 1211 and the housing 1212 for forming the connection portion 130 are relatively flat. Taking the formation of the connection portion 130 by welding as an example, after welding, since the welded surface is relatively flat, the risk of defects such as lack of fusion and false welding in the connection portion 130, that is, the weld, is relatively low.

[0143] In the above solution, since along the thickness direction of the end cap 1211, the first groove 127 is spaced apart from the connection portion 130, the risk of increasing the probability of defects in the connection portion 130 caused by the setting of the first groove 127 during the formation of the connection portion 130 can be reduced.

[0144] According to some embodiments of the present application, please refer to Figures 4 - 8Along the thickness direction of the end cap 1211, the first groove 127 is located on the side of the end cap 1211 facing the inside of the battery cell 12.

[0145] Along the thickness direction of the end cap 1211, the first groove 127 is located on the side of the end cap 1211 facing the inside of the battery cell 12, which means that the surface of the end cap 1211 and the housing 1212 for forming the connecting portion 130 to form the connecting portion 130 is very flat, and the risk of defects in the connecting portion 130 is relatively low.

[0146] In the above solution, since the first groove 127 is located on the side of the end cap 1211 facing the inside of the battery cell 12 along the thickness direction of the end cap 1211, the risk of increasing the probability of defects in the connecting portion 130 caused by the setting of the first groove 127 during the formation of the connecting portion 130 can be further reduced.

[0147] According to some embodiments of the present application, please refer to Figures 4 - 8 Along the thickness direction of the end cap 1211, the first groove 127 has a first end 1271 close to the connecting portion 130 and a second end 1272 far from the connecting portion 130. From the first end 1271 to the second end 1272, the groove depth of the first groove 127 first gradually increases and then gradually decreases.

[0148] The groove bottom surface of the first groove 127 may include multiple segments, and all of the multiple segments may be straight line segments, or all may be arc line segments. Of course, some may be straight line segments and some may be arc line segments.

[0149] Please refer to Figure 5 and Figure 6 Taking the force deformation of the housing 1212 of the battery cell 12 shown in Figure 5 and Figure 6 as an example for illustration, please refer to Figure 6 When the wall portion of the housing 1212 provided with the first groove 127 is stressed, assuming it bulges outwards, at this time, since the groove depth of the first groove 127 first gradually increases and then gradually decreases from the first end 1271 to the second end 1272, the bending amplitude of the blocking member 126 attached in the first groove 127 along with the outward bending of the housing 1212 is relatively small (compared with the example where the groove bottom surface of the first groove 127 is a vertical plane), that is, the risk of fatigue failure of the blocking member 126 is relatively low.

[0150] The above force deformation may be the expansion deformation of the battery cell 12 itself, or the deformation of the housing 1212 under external force.

[0151] In the above solution, from the first end 1271 close to the connecting portion 130 to the second end 1272 far from the connecting portion 130, the groove depth of the first groove 127 gradually increases first and then gradually decreases. During the process of the housing 1212 deforming under force, the blocking member 126 disposed in the first groove 127 deforms with the housing 1212 to a relatively small extent, the risk of fatigue failure is relatively low, and the reliability of the battery cell 12 is relatively high.

[0152] According to some embodiments of the present application, please refer to Figures 4 - 7 , the end cap 1211 has a first surface 12111 facing the inside of the battery cell 12. The blocking member 126 includes a first portion 1261, a second portion 1262, and a third portion 1263 that are connected to each other. The first portion 1261 is disposed between the first connection surface 128 and the second connection surface 129. The second portion 1262 adheres to the inner peripheral surface of the housing 1212 and a part of the second portion 1262 is located in the first groove 127. The third portion 1263 adheres to the first surface 12111.

[0153] The blocking member 126 includes a first portion 1261, a second portion 1262, and a third portion 1263 that are connected to each other, and the first portion 1261, the second portion 1262, and the third portion 1263 are disposed at different positions. The three portions of the blocking member 126 form a certain angle with each other, that is, each portion adheres to a different surface. The area of the connection interface of the blocking member 126 is relatively large, and the risk of connection failure is relatively low.

[0154] In the above solution, the blocking member 126 includes three portions connected to each other at different positions, which can further increase the area of the connection interface of the blocking member 126, further increase the adhesion of the blocking member 126, further reduce the risk of failure of the blocking member 126, and thus further improve the reliability of the battery cell 12.

[0155] According to some embodiments of the present application, please refer to Figures 5 - 7 , the second portion 1262 has a root portion 12621 connected to the third portion 1263 and a free end 12622 far from the third portion 1263. The thickness of the free end 12622 is greater than the thickness of the root portion 12621.

[0156] The thickness of the free end 12622 being greater than the thickness of the root portion 12621 means that the adhesion of the free end 12622 is due to the adhesion of the root portion 12621. When the second portion 1262 deforms with the housing 1212, the root portion 12621 is less likely to crack compared to the free end 12622.

[0157] In the above solution, the root 12621 is closer to the joint surface of the end cap 1211 and the housing 1212 than the free end 12622. During the process of the housing 1212 deforming under force, due to the greater thickness of the free end 12622, the adhesion force is stronger. At the same time, the root 12621 has a smaller thickness, and the risk of cracking is relatively low. The reliability of the battery cell 12 is higher.

[0158] According to some embodiments of the present application, please refer to Figures 5 - 7 , the battery cell 12 further includes an insulating member 125. Along the thickness direction of the end cap 1211, the insulating member 125 is located between the electrode assembly 122 and the end cap 1211; a blocking member 126 is located between the outer peripheral surface of the insulating member 125 and the inner peripheral surface of the housing 1212.

[0159] The material of the insulating member 125 may include, but is not limited to, plastics or rubbers, etc.

[0160] A relatively small space is defined between the outer peripheral surface of the insulating member 125 and the inner peripheral surface of the housing 1212. Disposing the blocking member 126 in the above space can achieve a sealing effect, improve the energy density, and reduce the cost.

[0161] In the above solution, the blocking member 126 located between the outer peripheral surface of the insulating member 125 and the inner peripheral surface of the housing 1212 can achieve a certain sealing effect. On the one hand, the volume of the blocking member 126 can be reduced, the energy density of the battery cell 12 can be improved, and on the other hand, the cost can be reduced.

[0162] According to some embodiments of the present application, please refer to Figures 5 - 7 , the blocking member 126 is connected to the outer peripheral surface of the insulating member 125.

[0163] The blocking member 126 is not only in contact with the surface of the first groove 127 but also connected to the outer peripheral surface of the insulating member 125, which is equivalent to increasing the area of the connection interface of the blocking member 126.

[0164] In the above solution, in addition to the part of the blocking member 126 disposed in the first groove 127, the blocking member 126 is also connected to the outer peripheral surface of the insulating member 125, which can further increase the area of the connection interface of the blocking member 126, improve the adhesion force of the blocking member 126, and reduce the risk of failure of the blocking member 126.

[0165] According to some embodiments of the present application, please refer to Figures 4 - 6 , the end cap 1211 has a first surface 12111 facing the inside of the battery cell 12 and a second surface 12112 facing away from the inside of the battery cell 12, and an outer peripheral surface connecting the first surface 12111 and the second surface 12112. The first connection surface 128 is the outer peripheral surface 12113 of the end cap; a part of the inner peripheral surface of the housing 1212 forms a second connection surface 129.

[0166] In the thickness direction of the end cap 1211, the end cap 1211 has a first surface 12111 and a second surface 12112. The first surface 12111 faces the inside of the housing 1212, and the second surface 12112 faces away from the inside of the housing 1212. That is to say, after the battery cell 12 is assembled, the first surface 12111 is the inner side surface of the end cap 1211, and the second surface 12112 is the outer side surface of the end cap 1211.

[0167] Please refer to Figure 5 , in the embodiment where the first connection surface 128 is the outer peripheral surface 12113 of the end cap, and a part of the inner peripheral surface of the housing 1212 forms the second connection surface 129, the connection portion 130 can be formed from the side of the second surface 12112.

[0168] In the above solution, at least a part of the end cap 1211 extends into the housing 1212. Thus, the outer peripheral surface 12113 of the end cap can be connected and fixed to the inner peripheral surface of the housing 1212, thereby forming the connection portion 130. At this time, the first connection surface 128 is the outer peripheral surface 12113 of the end cap, and the second connection surface 129 is a part of the inner peripheral surface of the housing 1212.

[0169] According to some embodiments of the present application, please refer to Figure 8 , the housing 1212 has an end face 12121 that connects the inner peripheral surface and the outer peripheral surface of the housing 1212. The second connection surface 129 is the end face 12121, and the end cap 1211 has a first surface 12111 facing the inside of the battery cell 12. A part of the first surface 12111 forms the first connection surface 128.

[0170] Please refer to Figure 8 , in the embodiment where the end face 12121 is the second connection surface 129 and a part of the first surface 12111 is the first connection surface 128, the connection portion 130 can be formed from the outer peripheral side of the housing 1212.

[0171] In the above solution, at least the part of the end cap 1211 connected to the housing 1212 does not extend into the housing 1212, but is directly connected and fixed to the end face 12121 of the housing 1212, thereby forming the connection portion 130. At this time, the end face 12121 of the housing 1212 near the opening is the second connection surface 129, and a part of the side surface of the end cap 1211 close to the inside of the housing 1212 in the thickness direction (i.e., the first surface 12111 of the end cap 1211 facing the inside of the battery cell 12) is the first connection surface 128.

[0172] According to some embodiments of the present application, please refer to Figure 11 and Figure 12, the end cap 1211 has a first surface 12111 facing the inside of the battery cell 12, and at least part of the edge region of the first surface 12111 is configured as a guiding inclined surface 12114.

[0173] That at least part of the edge region of the first surface 12111 is configured as the guiding inclined surface 12114 means that the guiding inclined surface 12114 is not in the same plane as other regions of the first surface 12111, nor is it parallel to other regions on the first surface 12111. Instead, the guiding inclined surface 12114 is inclined with respect to other regions on the first surface 12111.

[0174] For example, the guiding inclined surface 12114 has a first side away from the outer peripheral surface 12113 of the end cap and a second side close to the outer peripheral surface 12113 of the end cap. If the second surface 12112 is an overall flat plane, then from the first side to the second side, the distance between the guiding inclined surface 12114 and the second surface 12112 gradually decreases. In some embodiments of the present application, the guiding inclined surface 12114 can be a plane, and of course it can also be an arc surface, as long as the distance between the guiding inclined surface 12114 and the second surface 12112 gradually decreases from the first side to the second side.

[0175] In the above solution, when the end cap 1211 is located on the lower side of the battery cell 12 and after the battery cell 12 is heated, the blocking material is prevented from melting, and the molten blocking material can flow downward through the guiding inclined surface 12114 under the action of gravity and move to between the first connection surface 128 and the second connection surface 129.

[0176] According to some embodiments of the present application, please refer to Figure 11 and Figure 12 , the end cap 1211 further has a second surface 12112 facing away from the inside of the battery cell 12, and an outer peripheral surface connecting the first surface 12111 and the second surface 12112. The included angle formed between the guiding inclined surface 12114 and the outer peripheral surface 12113 of the end cap is an obtuse angle.

[0177] It should be noted that in the embodiment where the outer peripheral surface 12113 of the end cap is configured as the first connection surface 128 and is connected to a part of the inner peripheral surface of the housing 1212 to form a connection portion 130, the molten blocking material can flow to the first connection surface 128 and the second connection surface 129 through the guiding inclined surface 12114; in the embodiment where the end surface 12121 of the housing 1212 is configured as the second connection surface 129 and a part of the first surface 12111 is the first connection surface 128 that cooperates with the second connection surface 129, at least part of the first surface 12111 protrudes toward the inside of the battery cell 12 to form a protruding portion, and the guiding inclined surface 12114 can be the peripheral surface of the protruding portion.

[0178] In the above solution, since the included angle formed between the guiding inclined surface 12114 and the outer peripheral surface 12113 of the end cap is an obtuse angle, on the one hand, the molten blocking material can flow relatively gently, so that the blocking member 126 can more fully fill the gap between the first connecting surface 128 and the second connecting surface 129. On the other hand, the molten blocking material has sufficient flow velocity, which improves the efficiency of the blocking member 126 flowing to the gap between the first connecting surface 128 and the second connecting surface 129, that is, improves the assembly efficiency of the blocking member 126.

[0179] According to some embodiments of the present application, please refer to Figure 11 and Figure 12 , the guiding inclined surface 12114 surrounds the end cap 1211 and forms an annular region.

[0180] The guiding inclined surface 12114 can surround the end cap 1211, and can further reduce the amount of material used for the end cap 1211 and reduce the manufacturing cost of the end cap 1211.

[0181] In the above solution, when the battery cell 12 is heated, the blocking material initially located in the first groove 127 can move more uniformly to the gap between the first connecting surface 128 and the second connecting surface 129, so as to form the blocking member 126 of the present application, and improve the sealing performance between the end cap 1211 and the housing 1212.

[0182] According to some embodiments of the present application, please refer to Figure 11 and Figure 12 , the end cap 1211 further includes a second surface 12112 facing away from the inside of the battery cell 12, and an outer peripheral surface 12113 of the end cap connecting the first surface 12111 and the second surface 12112. A second groove 131 is provided in the edge region of the first surface 12111. One end of the second groove 131 extends to the outer peripheral surface 12113 of the end cap, and at least part of the bottom wall of the second groove 131 is configured as a guiding inclined surface 12114.

[0183] It can be understood that in the region on the inner peripheral surface of the housing 1212 that is not directly opposite to the second groove 131, there is a gap communicating with the second groove 131 between it and the end cap 1211, and the molten material flowing out of the second groove 131 coats the region on the inner peripheral surface of the housing 1212 that is not directly opposite to the second groove 131 through this gap.

[0184] Since the edge region of the first surface 12111 is not entirely an inclined surface, the flow of the molten material is more concentrated, and the molten material is more likely to reach the gap between the first connecting surface 128 and the second connecting surface 129 through the second groove 131. The probability of the situation where the molten material is not easily flowing to the gap between the first connecting surface 128 and the second connecting surface 129 due to the overall excessive edge region of the first surface 12111 is reduced.

[0185] In the above solution, the second groove 131 can introduce the molten barrier material between the first joint surface 128 and the second joint surface 129. The second groove 131 can store a certain amount of molten barrier material. Therefore, the height of the area coated with the barrier material in the area on the inner circumferential surface of the housing 1212 facing the second groove 131 is greater than that of other areas where the inner circumferential surface of the housing 1212 is coated with the barrier material, thereby improving the sealing effect between the end cap 1211 and the housing 1212 to at least a certain extent.

[0186] According to some embodiments of the present application, please refer to Figure 11 and Figure 12 , there are multiple second grooves 131, and the multiple second grooves 131 are arranged at intervals along the circumferential direction of the end cap 1211.

[0187] In the above solution, after the barrier material melts, the molten material can flow evenly between the first joint surface 128 and the second joint surface 129, improving the sealing uniformity between the end cap 1211 and the inner circumferential surface of the housing 1212. Of course, by arranging multiple second grooves 131 in the edge area of the first surface 12111, the material used for the end cap 1211 can be further reduced, and the manufacturing cost of the end cap 1211 can be reduced.

[0188] According to some embodiments of the present application, please refer to Figure 11 and Figure 12 , a third groove 132 is further provided on the first surface 12111. The third groove 132 is provided at one end of the second groove 131 away from the outer circumferential surface 12113 of the end cap and communicates with the second groove 131.

[0189] In some embodiments, the bottom surface of the second groove 131 is connected to the bottom surface of the third groove 132 and the first joint surface 128. Thus, the part of the barrier material located in the third groove 132 can very easily flow through the bottom surface of the second groove 131 and reach between the first joint surface 128 and the second joint surface 129 after the battery cell 12 is heated and melted.

[0190] The molten barrier material can flow from the first surface 12111 to the inner circumferential surface of the housing 1212, and even the molten barrier material can flow between the first joint surface 128 and the second joint surface 129.

[0191] In the above solution, the initial barrier material can also be stored in the third groove 132, and the thickness of the barrier material in the third groove 132 is greater than that of the barrier material in other areas of the first surface 12111. Therefore, after the battery cell 12 is heated, the amount of the molten material in the third groove 132 can support its flow between the first connection surface 128 and the second connection surface 129, so that a good sealing performance can be achieved between the end cap 1211 and the housing 1212. Of course, by providing the third groove 132, the material used for the end cap 1211 can be further reduced, and the manufacturing cost of the end cap 1211 can be reduced.

[0192] According to some embodiments of the present application, please refer to Figure 11 and Figure 12 , the third groove 132 is an annular groove extending along the circumference of the first surface 12111.

[0193] In the above solution, the part of the initial barrier material in the third groove 132 can have a sufficient amount of material after melting, and then can flow circumferentially between the first connection surface 128 and the second connection surface 129, so that the sealing performance between the end cap 1211 and the housing 1212 is further improved.

[0194] According to some embodiments of the present application, the barrier 126 is made of an insulating material.

[0195] Since the barrier 126 is made of an insulating material, the risk of the barrier 126 being short-circuited with other components in the battery cell 12 is relatively low, such as components like the end cap 1211, the adapter plate 124, and the electrode terminal 123.

[0196] In the above solution, since the barrier 126 is made of an insulating material, the risk of short-circuiting the battery cell 12 caused by setting the barrier 126 can be reduced.

[0197] According to some embodiments of the present application, the melting point of the barrier 126 is greater than or equal to 85 °C and less than or equal to 120 °C.

[0198] The melting point of the barrier 126 can be any value greater than or equal to 85 °C and less than or equal to 120 °C. For example, 85 °, 90 °, 95 °, 100 °, 105 °, 110 °, 115 ° or 120 °, etc.

[0199] It should be noted that the above melting points of the barrier 126 are only some specific embodiments of the present application. As long as the melting point of the barrier 126 meets the above range, it is within the protection scope of the present application.

[0200] In the above solution, on the one hand, the blocking member 126 can be melted when the battery cell 12 is heated, so that the melted blocking material can seal the end cap 1211 and the housing 1212. On the other hand, the blocking member 126 will not be melted due to too low a melting point during the normal use of the battery cell 12, improving the stability of the blocking member 126.

[0201] According to some embodiments of the present application, the blocking member 126 includes one of paraffin wax, rosin, PE wax, polyolefin, stearic acid, and white oil.

[0202] It can be understood that the blocking member 126 can be composed of a single material, and the single material can be any one of the above materials; of course, the blocking member 126 can also be composed of two or more of the above multiple materials together.

[0203] In the above solution, the blocking member 126 can be melted after the battery cell 12 is heated, and the melted blocking material can flow to seal the end cap 1211 and the housing 1212, improving the reliability of the battery cell 12.

[0204] According to some embodiments of the present application, please refer to Figure 2 , the present application provides a battery device 100, which includes the battery cell 12 in one or more of the above embodiments.

[0205] The battery device 100 mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 12 to provide higher voltage and capacity.

[0206] In some embodiments, the battery device 100 includes a box body 11.

[0207] In some embodiments, the battery device 100 can be a battery module. When there are multiple battery cells 12, the multiple battery cells 12 are arranged and fixed to form a battery module.

[0208] In some embodiments, the battery device 100 can be a battery pack. The battery pack includes a box body 11 and battery cells 12, and the battery cells 12 or the battery module is accommodated in the box body 11.

[0209] In some embodiments, the box body 11 can be part of the chassis structure of the vehicle 1000. For example, a part of the box body 11 can become at least a part of the floor of the vehicle 1000, or a part of the box body 11 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0210] In some embodiments, the battery device 100 can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0211] In the above solution, since the battery cell 12 in one or more of the above embodiments has high reliability, the battery device 100 including the battery cell 12 in one or more of the above embodiments also has high reliability.

[0212] According to some embodiments of the present application, the end cap 1211 is located below the housing 1212 in the direction of gravity.

[0213] In some embodiments, when the battery cell 12 is inverted and baked at a high temperature, the molten blocking material can flow to the side of the connecting portion 130 facing the inside of the battery cell 12 under the action of gravity, thereby reducing the probability of the electrolyte contacting the connecting portion 130.

[0214] The end cap 1211 of the battery cell 12 in any of the above embodiments can be located below the housing 1212 in the direction of gravity.

[0215] In the above solution, since the end cap 1211 is located below the housing 1212 in the direction of gravity, the risk that the electrolyte flows to the connecting portion 130 under the action of gravity and corrodes the connecting portion 130 is relatively high, that is, the risk of electrolyte leakage is relatively high. The setting of the blocking member 126 can significantly reduce the risk of electrolyte leakage, thereby making the battery cell 12 have high reliability.

[0216] According to some embodiments of the present application, please refer to Figure 1 , the present application provides an electrical device, which includes the battery cell 12 in one or more of the above embodiments, or, the battery device 100 in one or more of the above embodiments; the battery cell 12 or the battery device 100 is used to provide electrical energy.

[0217] In the above solution, since the battery cell 12 or the battery device 100 in one or more of the above embodiments has high reliability, the electrical device including the battery cell 12 or the battery device 100 in one or more of the above embodiments also has high reliability.

[0218] According to some embodiments of the present application, please refer to Figures 4 - 7 and Figures 9 - 10 , the present application provides a battery cell 12, which includes a housing 1212, an end cap 1211, an electrolyte, an electrode assembly 122, an insulating member 125, and a blocking member 126. The housing 1212 has an opening. The end cap 1211 covers the opening, and the end cap 1211 and the housing 1212 are sealingly connected to form a connecting portion 130.

[0219] The end cap 1211 is located below the housing 1212 in the direction of gravity. The electrolyte is disposed within the housing 1212. The electrode assembly 122 is disposed within the housing 1212. The barrier member 126 connects the end cap 1211 and the housing 1212 and is located on the side of the connecting portion 130 facing the inside of the battery cell 12. Wherein, a first groove 127 is provided on the inner circumferential surface of the housing 1212, and a part of the barrier member 126 is disposed within the first groove 127.

[0220] In the thickness direction of the end cap 1211, the insulating member 125 is located between the electrode assembly 122 and the end cap 1211, and the barrier member 126 is located between the outer circumferential surface of the insulating member 125 and the inner circumferential surface of the housing 1212. The barrier member 126 is connected to the outer circumferential surface of the insulating member 125.

[0221] There are a plurality of first grooves 127, and the plurality of first grooves 127 are spaced apart in the circumferential direction of the housing 1212. The end cap 1211 has a first connection surface 128, and the housing 1212 has a second connection surface 129. The first connection surface 128 and the second connection surface 129 are oppositely arranged and connected to form a connecting portion 130. A part of the barrier member 126 is disposed between the first connection surface 128 and the second connection surface 129. The first connection surface 128 is the outer circumferential surface 12113 of the end cap. A part of the inner circumferential surface of the housing 1212 forms the second connection surface 129. In the thickness direction of the end cap 1211, the first groove 127 is spaced apart from the connecting portion 130. In the thickness direction of the end cap 1211, the first groove 127 is located on the side of the end cap 1211 facing the inside of the battery cell 12. In the thickness direction of the end cap 1211, the first groove 127 has a first end 1271 close to the connecting portion 130 and a second end 1272 far from the connecting portion 130. From the first end 1271 to the second end 1272, the groove depth of the first groove 127 first gradually increases and then gradually decreases. The end cap 1211 has a first surface 12111 facing the inside of the battery cell 12. The barrier member 126 includes a first part 1261, a second part 1262, and a third part 1263 that are connected to each other. The first part 1261 is disposed between the first connection surface 128 and the second connection surface 129. The second part 1262 adheres to the inner circumferential surface of the housing 1212 and a part of the second part 1262 is located within the first groove 127. The third part 1263 adheres to the first surface 12111. The second part 1262 has a root 12621 connected to the third part 1263 and a free end 12622 far from the third part 1263, and the thickness of the free end 12622 is greater than the thickness of the root 12621.

[0222] 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 various embodiments of the present application, and they should all be covered within the scope of the claims and the description 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: A housing having an opening; An end cap covering the opening, the end cap and the housing being sealingly connected to form a connection portion; An electrolyte disposed within the housing; An electrode assembly disposed within the housing; A barrier member connecting the end cap and the housing and located on a side of the connection portion facing the interior of the battery cell; Wherein, a first groove is provided on the inner peripheral surface of the housing, and a part of the barrier member is disposed within the first groove.

2. The battery cell according to claim 1, characterized in that, A plurality of the first grooves are provided, and the plurality of first grooves are spaced apart along the circumferential direction of the housing.

3. The battery cell according to claim 1, wherein The end cap has a first connection surface, and the housing has a second connection surface. The first connection surface and the second connection surface are disposed opposite to each other and connected to form the connection portion, and a part of the barrier member is disposed between the first connection surface and the second connection surface.

4. The battery cell according to claim 3, characterized in that, Along the thickness direction of the end cap, the first groove is spaced apart from the connection portion.

5. The battery cell according to claim 4, characterized in that, Along the thickness direction of the end cap, the first groove is located on a side of the end cap facing the interior of the battery cell.

6. The battery cell according to claim 3, characterized in that, Along the thickness direction of the end cap, the first groove has a first end close to the connection portion and a second end far from the connection portion; From the first end to the second end, the groove depth of the first groove gradually increases first and then gradually decreases.

7. The battery cell according to claim 3, characterized in that, The end cap has a first surface facing the interior of the battery cell; The barrier member includes a first part, a second part, and a third part connected to each other. The first part is disposed between the first connection surface and the second connection surface, the second part adheres to the inner peripheral surface of the housing and a part of the second part is located within the first groove, and the third part adheres to the first surface.

8. The battery cell according to claim 7, wherein, The second part has a root connected to the third part and a free end far from the third part, and the thickness of the free end is greater than the thickness of the root.

9. The battery cell according to claim 1, wherein The battery cell further includes an insulating member. Along the thickness direction of the end cap, the insulating member is located between the electrode assembly and the end cap; The barrier member is located between the outer peripheral surface of the insulating member and the inner peripheral surface of the housing.

10. The battery cell according to claim 9, characterized in that, The barrier member is connected to the outer peripheral surface of the insulating member.

11. The battery cell according to claim 3, wherein, The end cap has a first surface facing the interior of the battery cell, a second surface facing away from the interior of the battery cell, and an outer peripheral surface connecting the first surface and the second surface. The first connection surface is the outer peripheral surface of the end cap; a part of the inner peripheral surface of the housing forms the second connection surface.

12. The battery cell according to claim 11, characterized in that, The housing has an end surface connecting the inner peripheral surface of the housing and the outer peripheral surface of the housing. The second connection surface is the end surface, and the end cap has a first surface facing the interior of the battery cell. A part of the first surface forms the first connection surface.

13. The battery cell according to claim 11, wherein, The end cap has a first surface facing the interior of the battery cell, and at least a part of the edge region of the first surface is configured as a guiding inclined surface.

14. The battery cell according to claim 13, characterized in that, The end cap further has a second surface facing away from the interior of the battery cell, and an outer peripheral surface connecting the first surface and the second surface; The included angle formed between the guiding inclined surface and the outer peripheral surface of the end cap is an obtuse angle.

15. The battery cell according to claim 13, characterized in that, The guiding inclined surface surrounds the end cap and forms an annular region.

16. The battery cell according to claim 13, wherein The end cap further includes a second surface facing away from the interior of the battery cell, and an outer peripheral surface of the end cap connecting the first surface and the second surface; A second groove is provided in an edge region of the first surface, one end of the second groove extends to the outer peripheral surface of the end cap, and at least a part of the bottom wall of the second groove is configured as the guiding inclined surface.

17. The battery cell according to claim 16, wherein There are a plurality of the second grooves, and the plurality of second grooves are arranged at intervals along the circumferential direction of the end cap.

18. The battery cell according to claim 16, wherein, A third groove is further provided on the first surface, and the third groove is provided at one end of the second groove away from the outer peripheral surface of the end cap and communicates with the second groove.

19. The battery cell according to claim 18, wherein The third groove is an annular groove extending along the circumferential direction of the first surface.

20. The battery cell according to claim 1, characterized in that, The blocking member is made of an insulating material.

21. The battery cell according to claim 1, wherein, The melting point of the blocking member is greater than or equal to 85 °C and less than or equal to 120 °C.

22. The battery cell according to claim 1, wherein, The blocking member includes one of paraffin wax, rosin, PE wax, polyolefin, stearic acid, and white oil.

23. A battery device, characterized in that, It includes the battery cell according to any one of claims 1-22.

24. The battery device according to claim 23, wherein, The end cap is located below the housing in the direction of gravity.

25. An electrical device, characterized in that, It includes the battery cell according to any one of claims 1-22, or the battery device according to claim 23 or 24; The battery cell or the battery device is used to provide electrical energy.

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