Battery cell, battery device and electric device

Abstract

A battery cell (12), a battery device (100) and an electric device, which relate to the technical field of battery devices (100). The battery cell (12) comprises a casing (1212), an end cap (1211), an electrolyte, an electrode assembly and a blocking member (125), wherein the casing (1212) is provided with an opening. The end cap (1211) covers the opening, and the end cap (1211) and the casing (1212) are hermetically connected to form a connecting portion (126). The electrolyte is disposed in the casing (1212). The electrode assembly is disposed in the casing (1212). The blocking member (125) is connected to the end cap (1211) and the casing (1212), and the blocking member (125) is located on the side of the connecting portion (126) away from the interior of the battery cell (12) and covers the connecting portion (126). Even if the connecting portion (126) fails, since the blocking member (125) covers the connecting portion (126) on the side of the connecting portion (126) away from the interior of the battery cell (12), the blocking member (125) can play the role of blocking the electrolyte, thereby reducing the risk of leakage of the electrolyte to the outside of the battery cell (12), and thus improving the reliability of the battery cell (12).

Description

Battery monomer, battery device and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery device, in particular to a battery monomer, a battery device and an electric device. BACKGROUND

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

[0003] How to improve the reliability of the battery monomer is a problem to be solved in the battery technology.

[0004] SUMMARY

[0005] In view of the above problems, the present application provides a battery monomer, a battery device and an electric device, which can improve the reliability of the battery monomer.

[0006] In a first aspect, the present application provides a battery monomer, the battery monomer comprising a shell, an end cover, an electrolyte, an electrode assembly and a blocking piece, the shell having an opening. The end cover covers the opening, and the end cover and the shell are sealingly connected to form a connecting portion. The electrolyte is arranged in the shell. The electrode assembly is arranged in the shell. The blocking piece connects the end cover and the shell, and the blocking piece is located on a side of the connecting portion away from the inside of the battery monomer and covers the connecting portion.

[0007] In the technical scheme of the present application, even if the connecting portion fails, since the blocking piece covers the connecting portion from the side of the connecting portion away from the inside of the battery monomer, the blocking piece can play a role in blocking the electrolyte, thereby reducing the risk of electrolyte leakage to the outside of the battery monomer and improving the reliability of the battery monomer.

[0008] In one or more embodiments of the first aspect, the end cover has a first surface away from the inside of the battery monomer, and the shell has a first outer peripheral surface away from the inside of the battery monomer. The blocking piece comprises a first portion and a second portion, the first portion covering at least a part of the first surface, and the second portion covering at least a part of the first outer peripheral surface.

[0009] In the above scheme, the first portion and the second portion are located on different surfaces of the outer shell of the battery monomer, which increases the area of the connection interface of the blocking piece, improves the adhesion of the blocking piece, reduces the risk of sealing failure caused by connection failure of the blocking piece, and further improves the reliability of the battery monomer.

[0010] In one or more embodiments of the first aspect, the blocking piece is an annular structure extending along the circumference of the opening.

[0011] In the scheme, the blocking piece is in a ring structure, can block electrolyte in all directions, reduces the probability of electrolyte leakage, and further improves the reliability of the battery cell.

[0012] In one or more embodiments of the first aspect, the battery cell further comprises an electrode terminal, the electrode terminal is arranged on the end cover, and along the thickness direction of the end cover, the maximum size of the electrode terminal protruding from the first surface is D1, the maximum size of the first part protruding from the first surface is D2, and 0.2mm≤D2≤D1.

[0013] In the scheme, when D2≥0.2mm, the first part has a certain thickness, which is beneficial to make the first part have good performance of blocking electrolyte leakage, so that the battery cell has high reliability; when D2≤D1, the blocking piece does not interfere with the assembly of the electrode terminal, which is beneficial to reduce the assembly difficulty of the battery cell and improve the assembly efficiency of the battery cell; therefore, when 0.2mm≤D2≤D1, the battery cell has high reliability while the assembly efficiency of the battery cell is improved.

[0014] In one or more embodiments of the first aspect, the end cover has a second surface facing the inside of the battery cell and a first surface away from the inside of the battery cell, and a second outer peripheral surface connecting the first surface and the second surface, and the shell has an inner peripheral surface facing the inside of the battery cell, and part of the inner peripheral surface is connected with the second outer peripheral surface to form a connecting part.

[0015] In the scheme, at least part of the end cover extends into the shell, so that the second outer peripheral surface of the end cover can be connected and fixed with the inner peripheral surface of the shell to form the connecting part.

[0016] In one or more embodiments of the first aspect, the shell has a first outer peripheral surface away from the inside of the battery cell and an end surface connecting the inner peripheral surface and the first outer peripheral surface, and the blocking piece covers the end surface.

[0017] In the scheme, the blocking piece also covers the end surface, further increases the coverage area of the blocking piece, improves the adhesion of the blocking piece, further reduces the risk of connection failure of the blocking piece, and makes the battery cell have high reliability.

[0018] In one or more embodiments of the first aspect, the shell has a first outer peripheral surface away from the inside of the battery cell, an inner peripheral surface facing the inside of the battery cell, and an end surface connecting the inner peripheral surface and the first outer peripheral surface, and the end cover has a second surface facing the inside of the battery cell, and part of the second surface is connected with the end surface to form a connecting part.

[0019] In the scheme, at least part of the end cover extending into the shell is directly connected and fixed on the end surface of the shell to form the connecting part.

[0020] In one or more embodiments of the first aspect, the end cover has a first surface facing away from the interior of the battery cell, and a second peripheral surface connecting the first surface and the second surface, and the blocking piece covers the second peripheral surface.

[0021] In the above solution, the blocking piece also covers the second peripheral surface, further increasing the coverage area of the blocking piece, improving the adhesion of the blocking piece, and further reducing the risk of connection failure of the blocking piece, so that the battery cell has higher reliability.

[0022] In one or more embodiments of the first aspect, the blocking piece is made of insulating material.

[0023] In the above solution, since the blocking piece is made of insulating material, the risk of short circuit of the battery cell caused by the blocking piece can be reduced.

[0024] In one or more embodiments of the first aspect, the melting point of the blocking piece is greater than or equal to 85℃ and less than or equal to 120℃.

[0025] In the above solution, on the one hand, the blocking piece can melt when the battery cell is heated, so that the molten blocking material can seal the end cover and the shell, and on the other hand, the blocking piece will not melt due to too low melting point when the battery cell is used normally, improving the stability of the blocking piece.

[0026] In one or more embodiments of the first aspect, the blocking piece includes at least one of paraffin, rosin, PE wax, polyolefin, stearic acid, and white oil.

[0027] In the above solution, the blocking piece can melt after the battery cell is heated, and the molten blocking material can flow to seal the end cover and the shell, improving the reliability of the battery cell.

[0028] In one or more embodiments of the first aspect, the end cover has a first surface facing away from the interior of the battery cell, and at least part of the edge area of the first surface is configured as a guide slope.

[0029] In the above solution, when the molten blocking material moves, it can flow more easily to different surfaces of the shell through the guide slope, on the one hand improving the adhesion of the blocking piece, and on the other hand facilitating the blocking piece to cover the connecting part comprehensively, reducing the risk of electrolyte leakage.

[0030] In one or more embodiments of the first aspect, the end cover also has a second surface facing the interior of the battery cell, and a second peripheral surface connecting the first surface and the second surface. The included angle between the guide slope and the second peripheral surface is obtuse.

[0031] In the above scheme, since the included angle formed between the guide slope and the second outer circumferential surface is an obtuse angle, on the one hand, the molten barrier material can flow more gently, and then the barrier material can flow to different surfaces without leaving the shell, and a more stable barrier is formed.

[0032] In one or more embodiments of the first aspect, the guide slope is arranged around the end cover and forms an annular region.

[0033] In the above scheme, when the battery monomer is heated, the barrier material initially located on the second surface can move more uniformly to the vicinity of the connecting portion and cover the connecting portion in all directions, so that the battery monomer has higher reliability.

[0034] In one or more embodiments of the first aspect, the end cover further comprises a second surface facing the inside of the battery monomer, and a second outer circumferential surface connecting the first surface and the second surface. The edge region of the first surface is provided with a first groove, one end of the first groove extends to the second outer circumferential surface, and at least part of the groove bottom wall of the first groove is configured as a guide slope.

[0035] In the above scheme, the first groove can accommodate a certain amount of molten barrier material, so the adhesion area of the barrier material in the first groove is larger, the connection stability is higher, and the reliability of the battery monomer can be further improved.

[0036] In one or more embodiments of the first aspect, the first groove is a plurality of first grooves, and the plurality of first grooves are arranged at intervals along the circumference of the end cover.

[0037] In the above scheme, by arranging a plurality of first grooves at intervals along the circumference of the end cover, the molten barrier material can be more uniformly covered, the risk of stress concentration can be reduced, the connection stability of the barrier can be improved, and the reliability of the battery monomer can be further improved. Of course, by arranging a plurality of second grooves on the edge region of the second surface, the material of the end cover can be further reduced, and the manufacturing cost of the end cover can be reduced.

[0038] In one or more embodiments of the first aspect, the first surface is further provided with a second groove, and the second groove is arranged at one end of the first groove away from the second outer circumferential surface and communicates with the first groove.

[0039] In the above scheme, the initial barrier material can also be arranged in the second groove, and the thickness of the barrier material in the second groove is larger than the thickness of the barrier material in other regions of the first surface. Therefore, the amount of material after the barrier material in the second groove melts can support it to cover more area, so that the end cover and the shell have good sealing performance.

[0040] In one or more embodiments of the first aspect, the second groove is an annular groove extending along the circumference of the first surface.

[0041] In the above scheme, the part of the blocking member located in the second groove can have sufficient amount of material after melting, and then can flow in the circumferential direction and cover more area, so that the sealing performance between the end cover and the shell is further improved.

[0042] In a second aspect, the application provides a battery device comprising the battery cell in one or more of the above embodiments.

[0043] In the above scheme, since the battery cell in one or more of the above embodiments has high reliability, the battery device comprising the battery cell in one or more of the above embodiments also has high reliability.

[0044] In one or more embodiments of the second aspect, the battery cell is provided in plurality, the plurality of battery cells are arranged along a first direction, and a heat insulation pad is arranged between two adjacent battery cells. The end cover has a first surface facing away from the inside of the battery cell, and the shell has a first outer circumferential surface facing away from the inside of the battery cell. The blocking member comprises a first part and a second part, the first part covers at least a part of the first surface, and the second part covers at least a part of the first outer circumferential surface. At least a part of the second part is located between two adjacent battery cells along the first direction. Along the first direction, the projection of the second part does not overlap with the projection of the heat insulation pad.

[0045] In the above scheme, since along the first direction, the projection of the second part does not overlap with the projection of the heat insulation pad, the risk of damage to the second part due to friction with the heat insulation pad is low, and thus the battery cell can maintain relatively high reliability.

[0046] In one or more embodiments of the second aspect, along the first direction, the size of the heat insulation pad is D3, and the maximum size of the second part is D4, satisfying: 0.2mm≤D4≤D3 / 2.

[0047] In the above scheme, when D4≥0.2mm, the second part has a certain thickness, which is beneficial to make the second part have good performance of blocking the leakage of electrolyte, so that the battery cell has high reliability; when D4≤D3 / 2, the risk of damage to two second parts due to friction with each other is low, which can make the battery cell maintain relatively high reliability; therefore, when 0.2mm≤D4≤D3 / 2, the battery cell can have high reliability.

[0048] In one or more embodiments of the second aspect, the end cover is located below the shell along the direction of gravity.

[0049] In the above scheme, since the end cover is located below the shell along the gravity direction, the risk of the electrolyte flowing to the connecting portion under the action of gravity and corroding the connecting portion is high, that is, the risk of electrolyte leakage is high, and the blocking piece can significantly reduce the risk of electrolyte leakage, so that the battery monomer has high reliability.

[0050] In a third aspect, the application provides a power consumption device comprising the battery monomer in one or more embodiments or the battery device in one or more embodiments; the battery monomer or the battery device is used to provide electric energy.

[0051] In the above scheme, since the battery monomer or the battery device in one or more embodiments has high reliability, the power consumption device comprising the battery monomer or the battery device in one or more embodiments also has high reliability.

[0052] The above description is only a summary of the technical scheme of the application, in order to enable the technical means of the application to be more clearly understood, and can be implemented according to the content of the specification, and in order to enable other purposes, features and advantages of the application to be more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0053] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the scope of the application. Moreover, the same reference numerals in the attached drawings indicate the same or similar elements. In the drawings:

[0054] Fig. 1 is a structural schematic diagram of a vehicle according to some embodiments of the application;

[0055] Fig. 2 is an exploded view of a battery device according to some embodiments of the application;

[0056] Fig. 3 is an exploded view of a battery monomer according to some embodiments of the application;

[0057] Fig. 4 is a schematic diagram of a partial structure of a battery device according to some embodiments of the application;

[0058] Fig. 5 is a sectional view of a partial structure of a battery device according to some embodiments of the application;

[0059] Fig. 6 is a sectional view of a shell according to further embodiments of the application;

[0060] Fig. 7 is a partial enlarged view of A in Fig. 5;

[0061] Fig. 8 is a partial enlarged view of B in Fig. 5;

[0062] Fig. 9 is a sectional view of a partial structure of a battery device according to further embodiments of the application;

[0063] Fig. 10 is an isometric view of an end cap according to some embodiments of the present application;

[0064] Fig. 11 is an enlarged view of the detail C in Fig. 10.

[0065] The reference signs in the detailed description of the embodiments means the following: 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery device; 11 - case; 111 - first case; 112 - second case; 12 - battery cell; 121 - housing; 1211 - end cap; 12111 - first surface; 12112 - second surface; 12113 - second peripheral surface; 12114 - guide slope; 1212 - housing; 12121 - opening; 12122 - first peripheral surface; 12123 - end surface; 122 - electrode assembly; 123 - electrode terminal; 124 - adapter tab; 125 - barrier; 1251 - first portion; 1252 - second portion; 126 - connecting portion; 127 - first groove; 128 - second groove; 13 - thermal insulation pad; X - first direction. DETAILED DESCRIPTION

[0066] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and the claims and the above description of drawings shall not be construed as excluding any additional elements or steps.

[0068] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0069] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0070] In the description of embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0071] In the present application, the battery cell can include, but is not limited to, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc. The shape of the battery cell can include, but is not limited to, a cylinder, a flat body, a cuboid, or other shapes, etc. The battery cell can include, but is not limited to, a cylindrical battery cell, a square battery cell, a soft pack battery cell, and a blade battery cell according to the packaging mode.

[0072] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel, or mixed connection through a busbar component.

[0073] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0074] In some embodiments, the battery apparatus can 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.

[0075] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0076] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0077] As an example, the box body can be part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beam and the longitudinal beam of the vehicle.

[0078] In some embodiments, the battery apparatus refers to an energy storage device, which includes a box body, and at least one side of the box body is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0079] In the following, the embodiments will be mainly described with respect to a cuboid battery cell. It should be understood that the embodiments described in the following are applicable to cylindrical battery cells or pouch battery cells or blade battery cells in some aspects.

[0080] In a general battery cell structure, the battery cell includes a housing, an electrode assembly, and an electrolyte. The housing includes a cap and a case, and the cap seals an opening of the case to define a receiving space for receiving the electrode assembly.

[0081] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charge-discharge rate, and in addition, the reliability of the battery needs to be considered.

[0082] The cap and the case of a general battery cell form a connection with poor sealing performance. When the electrolyte contacts the connection part formed by the cap and the case, the connection part will be corroded, and the risk of electrolyte leakage from the gap between the cap and the case will be significantly increased. Therefore, the reliability of the above-mentioned battery cell is poor.

[0083] In view of this, the present application provides a battery cell, which includes a case, a cap, an electrolyte, an electrode assembly, and a barrier. The case has an opening. The cap covers the opening, and the cap and the case are sealingly connected to form a connection part. The electrolyte is arranged in the case. The electrode assembly is arranged in the case. The barrier connects the cap and the case, and the barrier is located on a side of the connection part away from the inside of the battery cell and covers the connection part. Even if the connection part fails, since the barrier covers the connection part from the side of the connection part away from the inside of the battery cell, the barrier can play a role in blocking the electrolyte, thereby reducing the risk of electrolyte leakage to the outside of the battery cell and improving the reliability of the battery cell.

[0084] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices, and electric devices using batteries.

[0085] The electric device includes, but is not limited to, a battery car, an electric vehicle, a ship, and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0086] The following embodiments are described for convenience of illustration, taking a vehicle 1000 as an example of an electric device of an embodiment of the present application.

[0087] For example, FIG. 1 is a structural schematic 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 vehicle, or a range extended vehicle, etc. The vehicle 1000 can be provided with a motor 300, a controller 200, and a battery device 100. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as an operating power source of the vehicle 1000, and can be used for the circuit system of the vehicle 1000, such as the power demand for starting, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also can be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0088] In order to meet different power demands, the battery device 100 can include a plurality of battery cells 12. The plurality of battery cells 12 can be connected in series, in parallel, or in a mixed connection. The mixed connection refers to a mixture of series connection and parallel connection. Alternatively, the plurality of battery cells 12 can be connected in series, in parallel, or in a mixed connection to form a battery module. The plurality of battery modules can be connected in series, in parallel, or in a mixed connection to form the battery device 100. That is, the plurality of battery cells 12 can be directly connected to form the battery device 100, or can be connected to form a battery module, and the battery module can be connected to form the battery device 100.

[0089] For example, please refer to FIG. 2, which is an exploded view of the battery device 100 according to some embodiments of the present application. The battery device 100 can include a plurality of battery cells 12. The battery device 100 can also include a box 11, which is hollow inside, and the plurality of battery cells 12 are contained in the box 11. As shown in FIG. 2, the first box 111 and the second box 112 are fastened together. The shapes of the first box 111 and the second box 112 can be determined according to the shape of the combination of the plurality of battery cells 12. The first box 111 and the second box 112 can each have one open face 1212. For example, the first box 111 and the second box 112 can each be a hollow cuboid and each have only one open face 1212. The open face 1212 of the first box 111 and the open face 1212 of the second box 112 are arranged opposite to each other, and the first box 111 and the second box 112 are fastened to each other to form the box 11 with a closed cavity. The plurality of battery cells 12 are arranged in parallel or in series or in a hybrid combination in the box 11 formed by the fastening of the first box 111 and the second box 112. As an example, the box 11 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected to the frame, so that a closed space is formed inside the box 11 to accommodate the battery cell 12 assembly. As an example, the box 11 can be part of the chassis structure of the vehicle 1000. For example, the top cover of the box 11 can be at least part of the floor of the vehicle 1000, or the frame of the box 11 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0090] Optionally, the battery device 100 can also include other structures, which will not be described one by one here. For example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the plurality of battery cells 12, such as parallel connection, series connection, or hybrid connection. Specifically, the current collecting component can realize the electrical connection between the battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Further, the current collecting component can be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of the plurality of battery cells 12 can be further led out through the box 11 by a conductive mechanism.

[0091] According to different power requirements, the number of battery cells 12 can be set to any value. The plurality of battery cells 12 can be connected in series, in parallel, or in a hybrid manner to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery device 100 can be large, in order to facilitate installation, the battery cells 12 can be arranged in groups, and each group of battery cells 12 forms a battery module. The number of battery cells 12 included in the battery module is not limited and can be set according to requirements. The battery device 100 can include a plurality of battery modules, and these battery modules can be connected in series, in parallel, or in a hybrid manner.

[0092] Referring to FIG. 3, which is an exploded view of a 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 shell 1212, which has a plurality of walls that enclose a cavity for receiving the electrode assembly 122. The shell 1212 can be shaped according to the shape of the one or more electrode assemblies 122 combined together, for example, the shell 1212 can be a hollow cuboid or a square or a regular polyhedron, and one of the faces of the shell 1212 has an opening 12121 so that the one or more electrode assemblies 122 can be placed inside the shell 1212. The shell 1212 is filled with an electrolyte, such as an electrolytic solution.

[0093] The battery cell 12 can also include two electrode terminals 123, which can be disposed on an end cap 1211. The end cap 1211 is generally a flat plate, and the two electrode terminals 123 are fixed on the flat surface of the end cap 1211. The two electrode terminals 123 are respectively a positive electrode terminal 123 and a negative electrode terminal 123. Each electrode terminal 123 is respectively provided with a transition piece 124, which is located between the end cap 1211 and the electrode assembly 122, for electrically connecting the electrode assembly 122 and the electrode terminal 123. In the battery cell 12, the electrode assembly 122 can be provided as a single electrode assembly or multiple electrode assemblies according to actual use requirements, and the battery cell 12 is provided with multiple independent electrode assemblies 122.

[0094] According to some embodiments of the present application, referring to FIGS. 4-7, a battery cell 12 is provided, which includes a shell 1212, an end cap 1211, an electrolytic solution, an electrode assembly 122, and a barrier 125. The shell 1212 has an opening 12121. The end cap 1211 covers the opening 12121, and the end cap 1211 and the shell 1212 are sealingly connected to form a connection portion 126. The electrolytic solution is disposed in the shell 1212. The electrode assembly 122 is disposed in the shell 1212. The barrier 125 connects the end cap 1211 and the shell 1212, and the barrier 125 is located on the side of the connection portion 126 away from the inside of the battery cell 12 and covers the connection portion 126.

[0095] The housing 121 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell 121), or an aluminum-plastic film, etc.

[0096] 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 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, the active ions can pass through.

[0097] In some embodiments, the positive electrode can be a positive electrode sheet, which 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.

[0098] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0099] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. 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 (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0100] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a positive electrode active material of the battery device 100 can also be used.

[0101] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0102] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed.

[0103] In some embodiments, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0104] As an example, the negative active material can employ a negative active material for the battery device 100 that is publicly known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for the battery device 100 can also be used. These negative active materials can be used alone or in combination of two or more.

[0105] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited in the present application, and any publicly known porous structure separator film having good chemical stability and mechanical stability can be used.

[0106] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. In the case of a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a single member located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0107] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is provided between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0108] In some embodiments, the battery cell 12 further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent. The liquid electrolyte can also be referred to as an electrolytic solution.

[0109] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium boric oxalate, lithium difluorodiphosphoric oxalate, and lithium tetrafluorodiphosphoric oxalate.

[0110] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl 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, butane sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from ether solvents. The ether solvents can 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, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0111] In some embodiments, the gel-state electrolyte includes a polymer as a backbone network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0112] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, a composite solid-state electrolyte.

[0113] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, a cellulose, or the like.

[0114] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0115] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0116] In some embodiments, the electrode assembly 122 is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0117] In some embodiments, the electrode assembly 122 is in a stacked structure.

[0118] The barrier 125 is located on a side of the connection portion 126 facing away from the inside of the battery cell 12, meaning that the barrier 125 can be arranged from the outside of the battery cell 12. In some embodiments, the side facing away from the inside of the battery cell 12 can also be understood as a side facing away from the electrode assembly 122.

[0119] The blocking piece 125 covers the connecting part 126, meaning that even if the electrolyte corrodes the connecting part 126 to cause defects of the connecting part 126 (i.e., the electrolyte can pass through the connecting part 126), the electrolyte can still be blocked from leaking to the outside of the battery monomer 12 due to the presence of the blocking piece 125.

[0120] In the technical solution of the embodiments of the present application, even if the connecting part 126 fails, since the blocking piece 125 covers the connecting part 126 from the side of the connecting part 126 away from the inside of the battery monomer 12, the blocking piece 125 can play a role in blocking the electrolyte, thereby reducing the risk of electrolyte leakage to the outside of the battery monomer 12 and improving the reliability of the battery monomer 12.

[0121] According to some embodiments of the present application, please refer to FIGS. 4-9, the end cover 1211 has a first surface 12111 away from the inside of the battery monomer 12, and the shell 1212 has a first outer circumferential surface 12122 away from the inside of the battery monomer 12. The blocking piece 125 includes a first part 1251 and a second part 1252, the first part 1251 covers at least a part of the first surface 12111, and the second part 1252 covers at least a part of the first outer circumferential surface 12122.

[0122] In some embodiments, the first part 1251 and the second part 1252 are connected to each other.

[0123] The first part 1251 covers at least a part of the first surface 12111, and the second part 1252 covers at least a part of the first outer circumferential surface 12122, meaning that the blocking piece 125 covers at least the first surface 12111 and the first outer circumferential surface 12122 at the same time. Since the first surface 12111 and the first outer circumferential surface 12122 are not coplanar, a certain angle will be formed between the first part 1251 and the second part 1252, thereby facilitating to improve the adhesion of the blocking piece 125 to the shell 121. It can also be understood that the blocking piece 125 will also interact with the intersection line of the two planes, and this interaction makes the adhesion stronger. It can also be understood that compared with separately arranging the first part 1251, the second part 1252 is additionally arranged, thereby increasing the area of the connection interface of the blocking piece 125.

[0124] In the above scheme, the first part 1251 and the second part 1252 are respectively located on different surfaces of the shell 121 of the battery monomer 12, thereby increasing the area of the connection interface of the blocking piece 125, improving the adhesion of the blocking piece 125, reducing the risk of sealing failure caused by connection failure of the blocking piece 125, and further improving the reliability of the battery monomer 12.

[0125] According to some embodiments of the present application, please refer to FIGS. 4-9, the blocking piece 125 is a ring structure extending along the circumference of the opening 12121.

[0126] In some embodiments, the profile of the barrier 125 is adapted to the profile of the end cover 1211.

[0127] In the above scheme, the barrier 125 is annular in structure, which can block electrolyte in all directions, thereby reducing the probability of electrolyte leakage and further improving the reliability of the battery monomer 12.

[0128] According to some embodiments of the present application, referring to FIG. 8, the battery monomer 12 further comprises an electrode terminal 123, which is arranged on the end cover 1211 and protrudes from the first surface 12111 along the thickness direction of the end cover 1211, and the maximum size of the electrode terminal 123 protruding from the first surface 12111 is D1, the maximum size of the first part 1251 protruding from the first surface 12111 is D2, and 0.2mm≤D2≤D1.

[0129] In some embodiments, the electrode terminal 123 will be connected with the busbar to complete the assembly. For example, the connection is formed by welding. Since D2≤D1, when the busbar is connected with the electrode terminal 123, the barrier 125 will not interfere with the busbar, thereby reducing the assembly difficulty of the battery monomer 12 and improving the assembly efficiency.

[0130] The maximum size of the first part 1251 protruding from the first surface 12111 along the thickness direction of the end cover 1211 can be any value between 0.2mm and the maximum size of the electrode terminal 123 protruding from the first surface 12111 along the thickness direction of the end cover 1211, such as 0.2mm, 0.1D1, 0.2D1, 0.3D1, 0.4D1, 0.5D1, 0.6D1, 0.7D1, 0.8D1, 0.9D1, D1, etc.

[0131] In the above scheme, when D2≥0.2mm, the first part 1251 has a certain thickness, which is beneficial to make the first part 1251 have good performance of blocking electrolyte leakage, thereby making the battery monomer 12 have high reliability; when D2≤D1, the barrier 125 will not interfere with the assembly of the electrode terminal 123, which is beneficial to reduce the assembly difficulty of the battery monomer 12 and improve the assembly efficiency of the battery monomer 12; therefore, when 0.2mm≤D2≤D1, the battery monomer 12 has high reliability while the assembly efficiency of the battery monomer 12 is improved.

[0132] According to some embodiments of the present application, referring to FIGS. 4-8, the end cover 1211 has a second surface 12112 facing the inside of the battery monomer 12 and a first surface 12111 facing away from the inside of the battery monomer 12, and a second outer circumferential surface 12113 connecting the first surface 12111 and the second surface 12112, and the shell 1212 has an inner circumferential surface facing the inside of the battery monomer 12, and a part of the inner circumferential surface is connected with the second outer circumferential surface 12113 to form a connecting part 126.

[0133] In the thickness direction of the end cover 1211, the end cover 1211 has a first surface 12111 facing away from the inside of the shell 1212 and a second surface 12112 facing the inside of the shell 1212. That is, after the battery monomer 12 is assembled, the second surface 12112 is the inner side surface of the end cover 1211, and the first surface 12111 is the outer side surface of the end cover 1211.

[0134] Referring to FIG. 7, the connecting part 126 can be formed from the side of the first surface 12111.

[0135] In the above scheme, at least part of the end cover 1211 extends into the inside of the shell 1212, so that the second outer circumferential surface 12113 of the end cover 1211 can be connected and fixed with the inner circumferential surface of the shell 1212 to form the connecting part 126.

[0136] According to some embodiments of the present application, referring to FIGS. 4-8, the shell 1212 has a first outer circumferential surface 12122 facing away from the inside of the battery monomer 12 and an end surface 12123 connecting the inner circumferential surface and the first outer circumferential surface 12122, and the blocking piece 125 covers the end surface 12123.

[0137] In some embodiments, referring to FIG. 7, the first part 1251 and the second part 1252 are connected by the part of the blocking piece 125 covering the end surface 12123.

[0138] In some embodiments, the blocking material can be provided on the first surface 12111, and the molten blocking material flows through the end surface 12123 and flows to the first outer circumferential surface 12122.

[0139] In the above scheme, the blocking piece 125 also covers the end surface 12123, further increasing the coverage area of the blocking piece 125, improving the adhesion of the blocking piece 125, further reducing the risk of connection failure of the blocking piece 125, and making the battery monomer 12 have higher reliability.

[0140] According to some embodiments of the present application, referring to FIG. 9, the shell 1212 has a first outer circumferential surface 12122 facing away from the inside of the battery monomer 12, an inner circumferential surface facing the inside of the battery monomer 12, and an end surface 12123 connecting the inner circumferential surface and the first outer circumferential surface 12122, and the end cover 1211 has a second surface 12112 facing the inside of the battery monomer 12, and part of the second surface 12112 is connected with the end surface 12123 to form a connecting portion 126.

[0141] In some embodiments, referring to FIG. 9, the connecting portion 126 can be formed from the side of the first outer circumferential surface 12122.

[0142] In some embodiments, referring to FIG. 9, a molten barrier material can be arranged on the second outer circumferential surface 12113, and the barrier material flows to the first outer circumferential surface 12122 and covers the connecting portion 126.

[0143] In the above scheme, at least the part of the end cover 1211 connected with the shell 1212 does not extend into the inside of the shell 1212, but is directly connected and fixed to the end surface 12123 of the shell 1212, thereby forming the connecting portion 126.

[0144] According to some embodiments of the present application, referring to FIG. 9, the end cover 1211 has a first surface 12111 facing away from the inside of the battery monomer 12, and a second outer circumferential surface 12113 connecting the first surface 12111 and the second surface 12112, and the barrier 125 covers the second outer circumferential surface 12113.

[0145] In some embodiments, referring to FIG. 9, a molten barrier material can be arranged on the first surface 12111, and the barrier material flows through the second outer circumferential surface 12113 and flows to the first outer circumferential surface 12122 and covers the connecting portion 126.

[0146] In the above scheme, the barrier 125 also covers the second outer circumferential surface 12113, further increasing the coverage area of the barrier 125, improving the adhesion of the barrier 125, further reducing the risk of connection failure of the barrier 125, and making the battery monomer 12 have higher reliability.

[0147] According to some embodiments of the present application, the barrier 125 is made of insulating material.

[0148] Since the barrier 125 is made of insulating material, the risk of short circuit of the barrier 125 with other components in the battery device 100, such as the busbar, is also low.

[0149] In the above scheme, since the barrier 125 is made of insulating material, the risk of short circuit of the battery monomer 12 caused by the arrangement of the barrier 125 can be reduced.

[0150] According to some embodiments of the present application, the melting point of the blocking piece 125 is greater than or equal to 85℃ and less than or equal to 120℃.

[0151] The melting point of the blocking piece 125 can be any value greater than or equal to 85℃ and less than or equal to 120℃, for example, 85°, 90°, 95°, 100°, 105°, 110°, 115° or 120°, etc.

[0152] It should be noted that the above melting point of the blocking piece 125 is only some specific embodiments of the present application, as long as the melting point of the blocking piece 125 meets the above range, it is within the protection scope of the present application.

[0153] In the above scheme, on the one hand, the blocking piece 125 can melt when the battery monomer 12 is heated, so that the molten blocking material can seal the end cover 1211 and the shell 1212, on the other hand, the blocking piece 125 will not melt due to too low melting point when the battery monomer 12 is in normal use, which improves the stability of the blocking piece 125.

[0154] According to some embodiments of the present application, the blocking piece 125 includes at least one of paraffin, rosin, PE wax, polyolefin, stearic acid and white oil.

[0155] It can be understood that the blocking piece 125 can be composed of a single material, which can be any of the above materials; of course, the blocking piece 125 can also be composed of two or more of the above materials.

[0156] In the above scheme, the blocking piece 125 can melt after the battery monomer 12 is heated, and the molten blocking material can flow to seal the end cover 1211 and the shell 1212, thereby improving the reliability of the battery monomer 12.

[0157] According to some embodiments of the present application, please refer to FIG. 10 and FIG. 11, the end cover 1211 has a first surface 12111 facing away from the inside of the battery monomer 12, at least part of the edge area of the first surface 12111 is configured as a guide slope 12114.

[0158] At least part of the edge area of the first surface 12111 is configured as a guide slope 12114 means that the guide slope 12114 is not in the same plane as other areas of the first surface 12111, and the guide slope 12114 is also not parallel to other areas on the first surface 12111, but the guide slope 12114 is inclined compared to other areas on the first surface 12111.

[0159] For example, the guide slope 12114 has a first side away from the outer circumferential surface of the end cover 1211 and a second side close to the outer circumferential surface of the end cover 1211. If the second surface 12112 is a relatively flat plane as a whole, the distance between the guide slope 12114 and the second surface 12112 gradually decreases from the first side to the second side. In some embodiments of the present application, the guide slope 12114 can be a plane, and of course can also be a curved surface, as long as the distance between the guide slope 12114 and the second surface 12112 gradually decreases from the first side to the second side.

[0160] At the same time, due to the presence of the guide slope 12114, at least two intersecting lines of surfaces are formed, and the adhesion of the blocking member 125 is also correspondingly improved.

[0161] In the above scheme, when the molten blocking material moves, it can flow more easily to different surfaces of the shell 121 through the guide slope 12114, which on the one hand improves the adhesion of the blocking member 125, and on the other hand is conducive to the blocking member 125 covering the connecting portion 126 comprehensively, thereby reducing the risk of electrolyte leakage.

[0162] According to some embodiments of the present application, referring to FIGS. 10 and 11, the end cover 1211 further includes a second surface 12112 facing the inside of the battery monomer 12, and a second outer circumferential surface 12113 connecting the first surface 12111 and the second surface 12112. The included angle formed between the guide slope 12114 and the second outer circumferential surface 12113 is an obtuse angle.

[0163] In some embodiments, at least part of the first surface 12111 protrudes towards the outside of the battery monomer 12 to form a protruding portion, and the guide slope 12114 can be the circumferential surface of the protruding portion.

[0164] In the above scheme, since the included angle formed between the guide slope 12114 and the second outer circumferential surface 12113 is an obtuse angle, on the one hand, the molten blocking material can flow relatively gently, and on the other hand, the blocking material can flow to different surfaces without leaving the shell 121, and a relatively stable blocking member 125 is formed.

[0165] According to some embodiments of the present application, referring to FIGS. 10 and 11, the guide slope 12114 is arranged around the end cover 1211 and forms an annular region.

[0166] The guide slope 12114 can be arranged around the end cover 1211, which can further reduce the amount of material used for the end cover 1211 and reduce the manufacturing cost of the end cover 1211.

[0167] In the above scheme, when the battery monomer 12 is heated, the barrier material initially located on the second surface 12112 can be more evenly moved to the vicinity of the connecting portion 126 and fully cover the connecting portion 126, so that the battery monomer 12 has higher reliability.

[0168] According to some embodiments of the present application, referring to FIGS. 10 and 11, the end cover 1211 further comprises a second surface 12112 facing the inside of the battery monomer 12, and a second outer circumferential surface 12113 connecting the first surface 12111 and the second surface 12112. The edge region of the first surface 12111 is provided with a first groove 127, one end of the first groove 127 extends to the second outer circumferential surface 12113, and at least part of the groove bottom wall of the first groove 127 is configured as a guide inclined surface 12114.

[0169] 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 easily flowed to the remaining surface of the shell 121 through the first groove 127. The probability that the molten material is not easily flowed to the remaining surface of the shell 121 due to the edge region of the first surface 12111 being too large is reduced.

[0170] In the above scheme, the first groove 127 can accommodate a certain amount of molten barrier material, so that the adhesion area of the barrier material in the first groove 127 is larger, the connection stability is higher, and the reliability of the battery monomer 12 can be further improved.

[0171] According to some embodiments of the present application, referring to FIGS. 10 and 11, the first groove 127 is a plurality of first grooves 127, and the plurality of first grooves 127 are arranged at intervals along the circumference of the end cover 1211.

[0172] In the above scheme, by arranging a plurality of first grooves 127 at intervals along the circumference of the end cover 1211, the molten barrier material can be more evenly covered, the risk of stress concentration is reduced, the connection stability of the barrier piece 125 is improved, and the reliability of the battery monomer 12 is further improved. Of course, by arranging a plurality of second grooves 128 on the edge region of the second surface 12112, the material of the end cover 1211 can be further reduced, and the manufacturing cost of the end cover 1211 can be reduced.

[0173] According to some embodiments of the present application, referring to FIGS. 10 and 11, the first surface 12111 is further provided with a second groove 128, the second groove 128 is arranged at one end of the first groove 127 away from the second outer circumferential surface 12113, and the second groove 128 is in communication with the first groove 127.

[0174] In some embodiments, the portion of the barrier material located in the second groove 128 can flow very easily along the bottom surface of the first groove 127 and reach the rest of the surface of the housing 121 after the battery cell 12 is heated and melted.

[0175] In the above scheme, the initial barrier material can also be arranged in the second groove 128, and the thickness of the barrier material in the second groove 128 is greater than the thickness of the barrier material in other regions of the first surface 12111, so that the amount of material of the barrier material in the second groove 128 after melting can support covering more area, so that the end cover 1211 and the housing 1212 have good sealing performance.

[0176] According to some embodiments of the present application, referring to FIGS. 10 and 11, the second groove 128 is an annular groove extending along the circumference of the first surface 12111.

[0177] In the above scheme, the portion of the barrier material located in the second groove 128 can flow very easily along the bottom surface of the first groove 127 and reach the rest of the surface of the housing 121 after the battery cell 12 is heated and melted.

[0178] According to some embodiments of the present application, referring to FIG. 2, the present application provides a battery device 100, which includes the battery cell 12 in one or more embodiments described above.

[0179] 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.

[0180] In some embodiments, the battery device 100 includes a box 11.

[0181] In some embodiments, the battery device 100 can be a battery module, and when there are multiple battery cells 12, the multiple battery cells 12 are arranged and fixed to form a battery module.

[0182] In some embodiments, the battery device 100 can be a battery pack, which includes the box 11 and the battery cell 12, and the battery cell 12 or the battery module is contained in the box 11.

[0183] In some embodiments, the box 11 can be part of the chassis structure of the vehicle 1000. For example, part of the box 11 can be at least part of the floor of the vehicle 1000, or part of the box 11 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0184] 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.

[0185] In the above solution, since the battery cell 12 in the one or more embodiments has high reliability, the battery device 100 including the battery cell 12 in the one or more embodiments also has high reliability.

[0186] According to some embodiments of the present application, referring to FIGS. 4 and 5, the battery cell 12 is provided in plurality, and the plurality of battery cells 12 are arranged along the first direction X, and a heat insulation pad 13 is arranged between two adjacent battery cells 12. The end cover 1211 has a first surface 12111 facing away from the inside of the battery cell 12, and the shell 1212 has a first outer circumferential surface 12122 facing away from the inside of the battery cell 12. The blocking piece 125 includes a first portion 1251 covering at least a portion of the first surface 12111 and a second portion 1252 covering at least a portion of the first outer circumferential surface 12122, and at least a portion of the second portion 1252 is located between two adjacent battery cells 12 along the first direction X. Along the first direction X, the projection of the second portion 1252 does not overlap the projection of the heat insulation pad 13.

[0187] The material of the heat insulation pad 13 can include, but is not limited to, ceramic, aerogel, etc.

[0188] In some embodiments, the battery cell 12 is a square battery cell 12, and the first direction X is the width direction of the battery cell 12.

[0189] In the above solution, since along the first direction X, the projection of the second portion 1252 does not overlap the projection of the heat insulation pad 13, the risk of damage to the second portion 1252 due to friction with the heat insulation pad 13 is low, thereby the battery cell 12 can maintain relatively high reliability.

[0190] According to some embodiments of the present application, referring to FIGS. 4-7, along the first direction X, the size of the heat insulation pad 13 is D3, and the maximum size of the second portion 1252 is D4, which satisfies: 0.2mm≤D4≤D3 / 2.

[0191] Along the first direction X, the maximum size of the second portion 1252 can be any value between greater than or equal to 0.2mm and less than or equal to half of the size of the heat insulation pad 13, for example, 0.1D3, 0.2D3, 0.3D3, 0.4D3, 0.5D3, etc.

[0192] In the above scheme, when D4 is greater than or equal to 0.2 mm, the second part 1252 has a certain thickness, which is beneficial to make the second part 1252 have good performance of blocking the electrolyte from leaking out, so that the battery monomer 12 has higher reliability; when D4 is less than or equal to D3 / 2, the risk of damage of the two second parts 1252 due to friction with each other is low, so that the battery monomer 12 can maintain relatively high reliability; therefore, when 0.2 mm≤D4≤D3 / 2, the battery monomer 12 can have higher reliability.

[0193] According to some embodiments of the present application, the end cover 1211 is located below the shell 1212 along the direction of gravity.

[0194] In some embodiments, the blocking piece 125 can be arranged when the battery monomer 12 is in a normal position, and then the blocking piece 125 is assembled into the box 11 of the battery device 100 after being inverted.

[0195] In the above scheme, since the end cover 1211 is located below the shell 1212 along the direction of gravity, the risk of the electrolyte flowing to the connecting part 126 and corroding the connecting part 126 under the action of gravity is high, that is, the risk of electrolyte leakage is high, and the blocking piece 125 can significantly reduce the risk of electrolyte leakage, so that the battery monomer 12 has higher reliability.

[0196] According to some embodiments of the present application, please refer to FIG. 1, the present application provides a power consumption device, which includes the battery monomer 12 in one or more embodiments described above, or the battery device 100 in one or more embodiments described above; the battery monomer 12 or the battery device 100 is used to provide electric energy.

[0197] In the above scheme, since the battery monomer 12 or the battery device 100 in one or more embodiments described above has higher reliability, the power consumption device including the battery monomer 12 or the battery device 100 in one or more embodiments described above also has higher reliability.

[0198] According to some embodiments of the present application, referring to FIGS. 4-8, the present application provides a battery cell 12, which includes a housing 1212, an end cover 1211, an electrolyte, an electrode assembly 122, and a barrier 125. The housing 1212 has an opening 12121. The barrier 125 is paraffin wax. The end cover 1211 covers the opening 12121, and the end cover 1211 and the housing 1212 are sealingly connected to form a connection portion 126. The electrolyte is disposed in the housing 1212. The electrode assembly 122 is disposed in the housing 1212. The barrier 125 connects the end cover 1211 and the housing 1212, and is located on a side of the connection portion 126 away from the inside of the battery cell 12 and covers the connection portion 126. The end cover 1211 has a first surface 12111 facing away from the inside of the battery cell 12, and the housing 1212 has a first outer peripheral surface 12122 facing away from the inside of the battery cell 12. The barrier 125 includes a first portion 1251 covering at least a portion of the first surface 12111 and a second portion 1252 covering at least a portion of the first outer peripheral surface 12122. The barrier 125 is an annular structure extending in the circumferential direction of the opening 12121. The end cover 1211 has a second surface 12112 facing toward the inside of the battery cell 12 and the first surface 12111 facing away from the inside of the battery cell 12, and a second outer peripheral surface 12113 connecting the first surface 12111 and the second surface 12112, and the housing 1212 has an inner peripheral surface facing toward the inside of the battery cell 12, and a portion of the inner peripheral surface is connected with the second outer peripheral surface 12113 to form the connection portion 126.

[0199] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in the embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell includes: a case having an opening; a cover covering the opening, the cover and the case being sealingly connected to form a connection portion; an electrolyte disposed in the case; an electrode assembly disposed in the case; a barrier connecting the cover and the case, the barrier being located on a side of the connection portion facing away from an inside of the battery cell and covering the connection portion.

2. The battery cell according to claim 1, wherein: the cover has a first surface facing away from the inside of the battery cell, and the case has a first outer circumferential surface facing away from the inside of the battery cell; the barrier includes a first portion covering at least a portion of the first surface and a second portion covering at least a portion of the first outer circumferential surface.

3. The battery cell according to claim 1 or 2, wherein: the barrier is in a ring shape extending in a circumferential direction of the opening.

4. The battery cell according to claim 2, further comprising: an electrode terminal disposed in the cover, the electrode terminal protruding from the first surface in a thickness direction of the cover by a maximum dimension D1, and the first portion protruding from the first surface by a maximum dimension D2, 0.2 mm ≤ D2 ≤ D1.

5. The battery cell according to any one of claims 1 to 4, wherein: the cover has a second surface facing toward the inside of the battery cell and a first surface facing away from the inside of the battery cell, and a second outer circumferential surface connecting the first surface and the second surface, and the case has an inner circumferential surface facing toward the inside of the battery cell, a portion of the inner circumferential surface connecting the second outer circumferential surface to form the connection portion.

6. The battery cell according to claim 5, wherein: the case has a first outer circumferential surface facing away from the inside of the battery cell and an end surface connecting the inner circumferential surface and the first outer circumferential surface, and the barrier covers the end surface.

7. The battery cell according to any one of claims 1 to 4, wherein: the case has a first outer circumferential surface facing away from the inside of the battery cell, an inner circumferential surface facing toward the inside of the battery cell, and an end surface connecting the inner circumferential surface and the first outer circumferential surface, and the cover has a second surface facing toward the inside of the battery cell, a portion of the second surface connecting the end surface to form the connection portion.

8. The battery cell according to claim 7, wherein: the cover has a first surface facing away from the inside of the battery cell, and a second outer circumferential surface connecting the first surface and the second surface, and the barrier covers the second outer circumferential surface.

9. The battery cell according to any one of claims 1 to 8, wherein: the barrier is an insulating material.

10. The battery cell according to any one of claims 1 to 9, wherein: a melting point of the barrier is greater than or equal to 85°C and less than or equal to 120°C.

11. The battery cell according to any one of claims 1 to 10, wherein: The barrier includes at least one of paraffin, rosin, PE wax, polyolefin, stearic acid, and white oil. 12.The battery cell according to any one of claims 1-11, wherein The end cover has a first surface facing away from the inside of the battery cell, at least part of the edge region of the first surface is configured as a guide slope. 13.The battery cell according to claim 12, wherein The end cover further has a second surface facing toward the inside of the battery cell, and a second outer peripheral surface connecting the first surface and the second surface; An included angle formed between the guide slope and the second outer peripheral surface is obtuse. 14.The battery cell according to claim 12 or 13, wherein The guide slope is arranged around the end cover and forms an annular region. 15.The battery cell according to any one of claims 12-14, wherein The end cover further includes a second surface facing toward the inside of the battery cell, and a second outer peripheral surface connecting the first surface and the second surface; An edge region of the first surface is provided with a first groove, one end of the first groove extends to the second outer peripheral surface, and at least part of the groove bottom wall of the first groove is configured as the guide slope. 16.The battery cell according to claim 15, wherein The first groove is a plurality of grooves, and the plurality of first grooves are arranged at intervals along the circumference of the end cover. 17.The battery cell according to claim 15 or 16, wherein The first surface is further provided with a second groove, the second groove is arranged at an end of the first groove away from the second outer peripheral surface, and the second groove communicates with the first groove. 18.The battery cell according to claim 17, wherein The second groove is an annular groove extending along the circumference of the first surface.

19. A battery device characterized by comprising: A battery device including the battery cell according to any one of claims 1-18. 20.The battery device according to claim 19, wherein A plurality of battery cells are arranged along a first direction, and a thermal insulation pad is arranged between adjacent two battery cells; The end cover has a first surface facing away from the inside of the battery cell, and the shell has a first outer peripheral surface facing away from the inside of the battery cell; The barrier includes a first part and a second part, the first part covers at least part of the first surface, and the second part covers at least part of the first outer peripheral surface, at least part of the second part is located between two battery cells adjacent along the first direction; Along the first direction, the projection of the second part does not overlap with the projection of the thermal insulation pad. 21.The battery device according to claim 20, wherein Along the first direction, the size of the thermal insulation pad is D3, and the maximum size of the second part is D4, satisfying: 0.2mm≤D4≤D3 / 2.

22. The battery device of any one of claims 19-21, wherein, The end cover is located below the shell along the direction of gravity.

23. An electrical device, comprising: The use device includes the battery cell according to any one of claims 1-18, and the battery cell is used to provide electric energy; or the battery device of any one of claims 19-22, the battery device being used to provide electrical energy.

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