Battery monomer, battery module and electric equipment

Abstract

The utility model discloses a battery monomer, a battery module and electric equipment. The battery cell includes a case, an electrode assembly, a first end cap, and an electrode terminal. The first end cover is provided with a first mounting hole and a second mounting hole; the electrode terminal comprises a positive terminal and a negative terminal, and the positive terminal and the negative terminal are both mounted on the first end cover; the positive terminal comprises a first connecting part and a positive pole protruding out of the first connecting part, the positive pole penetrates through the first mounting hole, and at least part of the positive pole is located on the second side of the first end cover; the negative terminal comprises a body and a negative pole, and the negative pole penetrates through the second mounting hole and is connected with the body. During welding, the positive pole, the negative pole and the body can provide welding points, so that the probability that the first end cover is welded through is reduced, and the probability that electrolyte flows out of the shell is reduced. The positive terminal and the negative terminal are both mounted on the first end cover, so that the spatial layout of the battery monomer can be optimized, and the capacity and the energy density of the battery monomer can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell, a battery module and an electrical device. Background Art

[0002] A battery cell usually consists of components such as a housing, an electrode assembly, and an end cap for sealing. An electrolyte and an electrode assembly are accommodated in the housing. In order to connect the electrode assembly to an external circuit, the end cap is connected to an external connecting device by welding. However, due to the relatively thin thickness of the end cap, the end cap is easily welded through during welding, resulting in the outflow of the electrolyte from the housing. Summary of the Utility Model

[0003] The utility model provides a battery cell, a battery module and an electrical device to solve at least one of the above technical problems.

[0004] The battery cell according to an embodiment of the utility model includes:

[0005] A housing;

[0006] An electrode assembly, which is arranged in the housing;

[0007] A first end cap, which is arranged at a first end of the housing and is provided with a first mounting hole and a second mounting hole;

[0008] Electrode terminals, which include a positive electrode terminal and a negative electrode terminal, and both the positive electrode terminal and the negative electrode terminal are mounted on the first end cap;

[0009] The positive electrode terminal includes a first connecting portion and a positive electrode column protruding from the first connecting portion. The first connecting portion is located on a first side of the first end cap, and the positive electrode column passes through the first mounting hole, and at least part of the positive electrode column is located on a second side of the first end cap;

[0010] The negative electrode terminal includes a body and a negative electrode column. The body is located on the second side of the first end cap, and the negative electrode column passes through the second mounting hole and is connected to the body.

[0011] In the battery cell according to an embodiment of the utility model, since the positive electrode column passes through the first mounting hole and at least part of the positive electrode column is located on the second side of the first end cap, and the body is located on the second side of the first end cap and the negative electrode column passes through the second mounting hole and is connected to the body, therefore, during welding, the positive electrode column, the negative electrode column and the body can provide welding points, which can reduce the probability of the first end cap being welded through, and thus reduce the probability of the electrolyte flowing out of the housing.

[0012] In addition, since both the positive terminal and the negative terminal are installed on the first end cap, the spatial layout of the battery cell can be optimized, improving the axial space utilization rate of the battery cell, providing more space for the electrode assembly and other structures, helping to increase the capacity of the battery cell, and improving the energy density of the battery cell. Moreover, this can also concentrate the electrical connection points of the battery cell, simplify the connection method of the external circuit, and facilitate assembly, charging, and discharging.

[0013] In some embodiments, the negative electrode post includes a second connecting portion and a protruding portion protruding from the second connecting portion. The second connecting portion is located on the first side of the first end cap. The second connecting portion is electrically connected to the electrode assembly, and the protruding portion passes through the second mounting hole and connects to the body.

[0014] In some embodiments, the positive terminal is electrically connected to the first end cap, the negative terminal is insulatingly installed on the first end cap, the first end cap is electrically connected to the second end of the electrode assembly. The battery cell further includes a second end cap, a first current collector, and a second current collector. The second end cap is disposed at the second end of the housing. The first current collector is electrically connected to the first end of the electrode assembly. The first current collector is electrically connected to the second connecting portion. The second current collector is electrically connected to the second end of the electrode assembly. The second current collector is electrically connected to the second end cap. Different polarities of current are output from the first end and the second end of the electrode assembly.

[0015] In some embodiments, both the first current collector and the second current collector are provided with liquid passing holes.

[0016] In some embodiments, the battery cell further includes a first insulating member. The body is installed on the first end cap through the first insulating member. The first insulating member includes a first part and a second part connected to the first part. The first part is located on the second side of the first end cap and is disposed between the body and the first end cap. The second part passes through the second mounting hole and is sleeved on the protruding portion.

[0017] In some embodiments, the first end cap is provided with a first connecting hole. The first insulating member includes a third part connected to the first part, and the third part is snap-connected to the first connecting hole.

[0018] In some embodiments, the battery cell further includes a second insulating member. The second insulating member is located on the first side of the first end cap and is disposed between the first end cap and the second connecting portion. The second insulating member is provided with a through hole. The through hole and the second mounting hole are arranged in sequence along the extending direction of the protruding portion, and the protruding portion passes through the second mounting hole and the through hole.

[0019] In some embodiments, there is a gap between the second insulating member, the second connecting portion and the first end cap. The battery cell further includes a sealing member, at least a part of the sealing member is located in the through hole, and the sealing member is used to seal the gap.

[0020] In some embodiments, the battery cell further includes a second end cap, the second end cap is disposed at the second end of the housing, the first end cap is provided with a first weak portion, and the second end cap is provided with a second weak portion.

[0021] In some embodiments, the first end cap is provided with a second connecting hole, the second end cap is provided with a third connecting hole, the first weak portion includes a first explosion-proof valve, the second weak portion includes a second explosion-proof valve, the first explosion-proof valve is installed in the second connecting hole, and the second explosion-proof valve is installed in the third connecting hole.

[0022] In some embodiments, there is an included angle between the first explosion-proof valve and the second explosion-proof valve, and the included angle is less than 10°.

[0023] In some embodiments, the positive terminal is integrally formed with the first end cap.

[0024] The battery module according to the embodiment of the present invention includes the battery cell according to any one of the above embodiments.

[0025] The electrical device according to the embodiment of the present invention includes the battery cell according to any one of the above embodiments or the battery module according to the above embodiment.

[0026] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0027] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0028] Figure 1 is a schematic structural diagram of the battery cell according to the embodiment of the present invention from the first perspective;

[0029] Figure 2 is an exploded view of the battery cell according to the embodiment of the present invention;

[0030] Figure 3 is a schematic structural diagram of the battery cell according to the embodiment of the present invention from the second perspective;

[0031] Figure 4 is Figure 3Cross-sectional view of the battery cell in the A-A direction;

[0032] Figure 5 is Figure 4 Enlarged view of part a of the battery cell;

[0033] Figure 6 is Figure 5 Enlarged view of part b of the battery cell;

[0034] Figure 7 Schematic structural view of the second current collector of the embodiment of the present invention;

[0035] Figure 8 Schematic structural view of the battery module of the embodiment of the present invention;

[0036] Figure 9 Schematic structural view of the electrical device of the embodiment of the present invention.

[0037] Description of reference numerals:

[0038] Battery cell 100; housing 10; first end 11 of the housing; second end 12 of the housing; electrode assembly 20; first end 21 of the electrode assembly; second end 22 of the electrode assembly; first end cap 30; first mounting hole 31; second mounting hole 32; electrode terminal 40; positive terminal 41; negative terminal 42; first connection portion 410; positive electrode post 411; body 420; negative electrode post 421; third mounting hole 4200; second connection portion 4210; protruding portion 4211; second end cap 50; first current collector 60; second current collector 70; liquid passing hole 101; first insulating member 80; first portion 81; second portion 82; first connection hole 33; third portion 83; second insulating member 90; through hole 91; gap 102; sealing member 103; first weak portion 34; second weak portion 51; second connection hole 35; third connection hole 52; first explosion-proof valve 340; second explosion-proof valve 510; liquid injection port 13; battery module 200; box body 210; electrical device 300. Detailed implementation manners

[0039] The following details the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0040] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0041] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0043] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0044] Please refer to Figure 1 and Figure 2 , the battery cell 100 of the embodiment of the present utility model includes a housing 10, an electrode assembly 20, a first end cap 30, and an electrode terminal 40. The electrode assembly 20 is disposed inside the housing 10; the first end cap 30 is disposed at the first end 11 of the housing 10 and is provided with a first mounting hole 31 and a second mounting hole 32; the electrode terminal 40 includes a positive terminal 41 and a negative terminal 42, and both the positive terminal 41 and the negative terminal 42 are mounted on the first end cap 30; the positive terminal 41 includes a first connecting portion 410 and a positive electrode post 411 protruding from the first connecting portion 410, and the first connecting portion 410 is located on the first side of the first end cap 30. Please continue to refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , the positive electrode post 411 passes through the first mounting hole 31, and at least part of the positive electrode post 411 is located on the second side of the first end cap 30; the negative terminal 42 includes a body 420 and a negative electrode post 421, the body 420 is located on the second side of the first end cap 30, and the negative electrode post 421 passes through the second mounting hole 32 and is connected to the body 420.

[0045] In the battery cell 100 of the embodiment of the present utility model, since the positive electrode post 411 passes through the first mounting hole 31 and at least part of the positive electrode post 411 is located on the second side of the first end cap 30, and the body 420 is located on the second side of the first end cap 30 and the negative electrode post 421 passes through the second mounting hole 32 and is connected to the body 420, therefore, during welding, the positive electrode post 411, the negative electrode post 421, and the body 420 can provide welding points, which can reduce the probability of the first end cap 30 being welded through, thereby reducing the probability of the electrolyte flowing out of the housing 10.

[0046] In addition, since both the positive terminal 41 and the negative terminal 42 are installed on the first end cap 30, the spatial layout of the battery cell 100 can be optimized, improving the axial space utilization rate of the battery cell 100, providing more space for the electrode assembly 20 and other structures, helping to increase the capacity of the battery cell 100, and enhancing the energy density of the battery cell 100. Moreover, this can also concentrate the electrical connection points of the battery cell 100, simplify the connection method of the external circuit, and facilitate assembly, charging, and discharging.

[0047] Specifically, the battery cell 100 can include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, etc., and the embodiments of the present utility model do not limit this. The battery cell 100 can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, and the embodiments of the present utility model do not limit this either. Generally, the battery cell 100 is divided into three types according to the encapsulation method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present utility model do not limit this either.

[0048] The housing 10 is the outer structure of the battery cell 100, which plays a role in protecting the internal components and containing the electrolyte. The housing 10 can be made of a metal material, and the housing 10 is electrically connected to both the first end cap 30 and the second end cap 50. Here, the electrical connection means that current can conduct among the housing 10, the first end cap 30, and the second end cap 50.

[0049] The electrode assembly 20 can include a positive electrode and a negative electrode active material. The positive electrode and the negative electrode active material can undergo an electrochemical reaction in the electrolyte contained inside the housing 10 to achieve the storage and conversion of electrical energy. The electrode assembly 20 can also include a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate, the negative electrode plate, and the separator can form the electrode assembly 20 by winding.

[0050] The first end cap 30 is a component provided at the first end 11 of the housing 10. The first end cap 30 and the housing 10 can be directly connected, such as fixed by means of bolts, welding, etc.; they can also be indirectly connected, such as connected through structures such as connection blocks and connection brackets. The first end cap 30 and the housing 10 are electrically connected.

[0051] Both the first mounting hole 31 and the second mounting hole 32 can be through holes opened on the first end cap 30. Both the first mounting hole 31 and the second mounting hole 32 can penetrate the first end cap 30 along the thickness direction of the first end cap 30. There is a gap between the first mounting hole 31 and the second mounting hole 32. The sizes of the first mounting hole 31 and the second mounting hole 32 can be the same or different. The shape of the first mounting hole 31 can be a regular shape such as a circle or a square, or an irregular shape.

[0052] The electrode terminal 40 is used to connect to an external circuit so that the electric energy generated by the battery cell 100 can be output. During the charge and discharge process of the battery cell 100, the positive and negative active materials in the electrode assembly 20 react with the electrolyte, and the tab of the electrode assembly 20 can be connected to the electrode terminal 40 to form a current loop. The positive terminal 41 can be positively charged, and the negative terminal 42 can be negatively charged.

[0053] The first connection portion 410 can be connected to the first side of the first end cap 30. The connection method can be a direct connection, such as being fixed by means of bolts, welding, etc.; it can also be an indirect connection, such as being connected through structures such as connection blocks and connection brackets.

[0054] The positive electrode post 411 can be integrally formed with the first connection portion 410 or separately formed. The thickness of the positive electrode post 411 can be greater than the thickness of the first end cap 30. A part of the structure of the positive electrode post 411 penetrates through the first mounting hole 31, and another part of the structure extends out of the first mounting hole 31 and is located on the second side of the first end cap 30. Among them, the first side of the first end cap 30 is the side of the first end cap 30 close to the electrode assembly 20, and the second side of the first end cap 30 is the side of the first end cap 30 far from the electrode assembly 20.

[0055] The body 420 can be sleeved on the negative electrode post 421, and the body 420 and the negative electrode post 421 can be conductively connected. The body 420 can be insulatingly mounted on the first end cap 30. The body 420 can be annular or other shapes.

[0056] In some embodiments, the body 420 is provided with a third mounting hole 4200. The second mounting hole 32 and the third mounting hole 4200 are arranged in sequence along the thickness direction of the first end cap 30. The negative electrode post 421 penetrates through the third mounting hole 4200, and at least part of the negative electrode post 421 is located on the second side of the first end cap 30.

[0057] The third mounting hole 4200 can be a through hole that penetrates the body 420 along the thickness direction of the body 420. The shape of the third mounting hole 4200 can be a regular shape such as a circle or a square, or an irregular shape. Among them, the thickness direction of the body 420 can be the same as the thickness direction of the first end cap 30.

[0058] The negative electrode terminal 421 can be strip-shaped or in other shapes. The length of the negative electrode terminal 421 can be greater than the sum of the thicknesses of the first end cap 30 and the body 420. The negative electrode terminal 421 can be coplanar with the outer surface of the body 420 facing away from the first end cap 30, or can protrude from or be recessed into the outer surface of the body 420 facing away from the first end cap 30. Or rather, the negative electrode terminal 421 can be located within the third mounting hole 4200 or can extend out of the third mounting hole 4200. The negative electrode terminal 421 and the body 420 can be integrally formed; or can be connected by means such as welding and interference fit connection.

[0059] Please refer to Figure 2 and Figure 6 , in some embodiments, the negative electrode terminal 421 includes a second connecting portion 4210 and a protruding portion 4211 protruding from the second connecting portion 4210. The second connecting portion 4210 is located on the first side of the first end cap 30. The second connecting portion 4210 is electrically connected to the electrode assembly 20. The protruding portion 4211 passes through the second mounting hole 32 and is connected to the body 420.

[0060] Thus, the protruding portion 4211 can provide an additional welding point. The second connecting portion 4210 enables the negative electrode terminal 421 to transmit the current output by the electrode assembly 20. Since the protruding portion 4211 and the second connecting portion 4210 are located on different sides of the first end cap 30, this further improves the space utilization rate of the battery cell 100, provides more space for the electrode assembly 20 and other structures, helps to increase the capacity of the battery cell 100, and improves the energy density of the battery cell 100.

[0061] Specifically, the second connecting portion 4210 and the protruding portion 4211 can be integrally formed or can be separately formed. The second connecting portion 4210 can be electrically connected to the electrode assembly 20 in a form of direct contact, or can be indirectly electrically connected through other components.

[0062] During assembly, the positioning of the protruding portion 4211 can be achieved through the second mounting hole 32 and the third mounting hole 4200. The length of the protruding portion 4211 can be greater than the sum of the thicknesses of the first end cap 30 and the body 420. The protruding portion 4211 can be coplanar with the outer surface of the body 420 facing away from the first end cap 30, or can protrude from or be recessed into the outer surface of the body 420 facing away from the first end cap 30. Or rather, the protruding portion 4211 can be located within the third mounting hole 4200 or can extend out of the third mounting hole 4200. The protruding portion 4211 and the body 420 can be integrally formed; or can be connected by means such as welding and interference fit connection.

[0063] In some embodiments, the protruding portion 4211 can pass through the third mounting hole 4200, and at least part of the protruding portion 4211 is located on the second side of the first end cap 30.

[0064] Please refer to Figure 1 、 Figure 2 and Figure 6 In some embodiments, the positive terminal 41 is electrically connected to the first end cap 30, the negative terminal 42 is insulatingly mounted on the first end cap 30, the first end cap 30 is electrically connected to the second end 22 of the electrode assembly 20, the battery cell 100 further includes a second end cap 50, a first current collector 60 and a second current collector 70. The second end cap 50 is disposed at the second end 12 of the housing 10. The first current collector 60 is electrically connected to the first end 21 of the electrode assembly 20, the first current collector 60 is electrically connected to the second connection portion 4210, the second current collector 70 is electrically connected to the second end 22 of the electrode assembly 20, the second current collector 70 is electrically connected to the second end cap 50, and the first end 21 and the second end 22 of the electrode assembly 20 output currents of different polarities.

[0065] Thus, the use of the first current collector 60 and the second current collector 70 helps to more evenly distribute the current, reduce the overheating problem caused by too high local current density, reduce the temperature rise of the battery cell 100, and improve the rate performance of the battery cell 100. In addition, the use of the first current collector 60 and the second current collector 70 can provide a large contact area, thereby improving the current transmission path, reducing the internal resistance, and improving the rate performance of the battery cell 100.

[0066] The current output from the first end 21 of the electrode assembly 20 can be conducted to the second connection portion 4210 through the first current collector 60, so that the negative electrode post 421 is charged. The current output from the second end 22 of the electrode assembly 20 can be conducted to the second end cap 50 through the second current collector 70 and conducted to the first end cap 30 via the housing 10, so that the positive electrode post 411 is charged. Since the first end 21 and the second end 22 of the electrode assembly 20 output currents of different polarities, the current polarities on the positive electrode post 411 and the negative electrode post 421 are different. Since both the positive electrode post 411 and the negative electrode post 421 are mounted on the first end cap 30, the connection mode of the external circuit can be simplified, facilitating assembly and charging / discharging.

[0067] Specifically, the positive terminal 41 and the first end cap 30 can be electrically connected by direct contact. For example, the positive terminal 41 and the first end cap 30 can be connected by welding so that current can be conducted between the positive terminal 41 and the first end cap 30. The positive terminal 41 and the first end cap 30 can also be electrically connected using a conductive gasket or a conductive adhesive.

[0068] A washer or other structure made of plastic, rubber or other materials with good electrical insulation properties can be provided between the negative terminal 42 and the first end cap 30 to achieve insulation isolation therebetween.

[0069] The first end 11 and the second end 12 of the housing 10 are opposite ends of the housing 10. The second end cap 50 is a component disposed at the second end 12 of the housing 10. The second end cap 50 and the housing 10 can be directly connected, such as fixed by means of bolt connection, welding, etc.; they can also be indirectly connected, such as connected through structures such as connection blocks and connection brackets. The second end cap 50 and the housing 10 are electrically connected.

[0070] The first current collector 60 and the second current collector 70 can be conductive structures made of materials with high electrical conductivity, such as copper or aluminum, to reduce resistance loss and improve the charge and discharge efficiency of the battery cell 100.

[0071] The first current collector 60 can include two mutually bent parts. One part can be electrically connected to the first end 21 of the electrode assembly 20, and the other part can be electrically connected to the second connection portion 4210. Among them, the part electrically connected to the electrode assembly 20 can be set as a disc shape to provide a large conductive area.

[0072] Between the first current collector 60 and the second connection portion 4210, and between the first current collector 60 and the first end 21 of the electrode assembly 20, electrical connection can be achieved by direct contact. For example, between the first current collector 60 and the second connection portion 4210, and between the first current collector 60 and the first end 21 of the electrode assembly 20, both can be fixed by laser welding so that current can conduct between the first end 21 of the electrode assembly 20, the first current collector 60, and the second connection portion 4210. Between the first current collector 60 and the second connection portion 4210, and between the first current collector 60 and the first end 21 of the electrode assembly 20, electrical connection can also be achieved using conductive gaskets or conductive adhesives.

[0073] The second current collector 70 can include two mutually bent parts. One part can be electrically connected to the second end 22 of the electrode assembly 20, and the other part can be electrically connected to the second end cap 50. Among them, the part electrically connected to the electrode assembly 20 can be set as a disc shape to provide a large conductive area.

[0074] Between the second current collector 70 and the second end cap 50, and between the second current collector 70 and the second end 22 of the electrode assembly 20, electrical connection can be achieved by direct contact. For example, between the second current collector 70 and the second end cap 50, and between the second current collector 70 and the second end 22 of the electrode assembly 20, both can be fixed by laser welding so that current can conduct between the second end 22 of the electrode assembly 20, the second current collector 70, and the second end cap 50.

[0075] A conductive gasket or conductive adhesive can also be used to achieve electrical connection between the second current collector 70 and the second end cap 50, as well as between the second current collector 70 and the second end 22 of the electrode assembly 20.

[0076] Both the first end 21 and the second end 22 of the electrode assembly 20 can be made by processes such as flattening or stacking and cutting. The first end 21 of the electrode assembly 20 can be the end that outputs negative electricity in the electrode assembly 20, and the negative electricity output by the electrode assembly 20 can pass through the first current collector 60, the second connecting portion 4210, the protruding portion 4211, and the body 420, so that the negative terminal 42 is negatively charged.

[0077] The second end 22 of the electrode assembly 20 can be the end that outputs positive electricity in the electrode assembly 20, and the positive electricity output by the electrode assembly 20 can pass through the second current collector 70, the second end cap 50, the housing 10, and then conduct to the first end cap 30, and further conduct to the positive terminal 41, so that the positive terminal 41 is positively charged.

[0078] Please refer to Figure 2 and Figure 7 , in some embodiments, both the first current collector 60 and the second current collector 70 are provided with liquid passing holes 101.

[0079] In this way, the setting of the liquid passing holes 101 can enable the electrolyte to penetrate into various positions of the electrode assembly 20, thereby accelerating the infiltration of the electrolyte into the electrode assembly 20, which helps to improve the energy conversion efficiency of the battery cell 100 and reduce the performance loss caused by uneven distribution of the electrolyte.

[0080] Specifically, the liquid passing holes 101 are through holes opened in the first current collector and the second current collector for the electrolyte to pass through. After the electrolyte is injected into the housing 10, the electrolyte can fall onto various positions on the first end 21 and the second end 22 of the electrode assembly 20 through the liquid passing holes 101.

[0081] Please refer to Figure 2 and Figure 6 , in some embodiments, the battery cell 100 further includes a first insulating member 80. The body 420 is mounted on the first end cap 30 through the first insulating member 80. The first insulating member 80 includes a first portion 81 and a second portion 82 connected to the first portion 81. The first portion 81 is located on the second side of the first end cap 30 and is disposed between the body 420 and the first end cap 30; the second portion 82 passes through the second mounting hole 32 and is sleeved on the protruding portion 4211.

[0082] In this way, the first insulating member 80 can isolate the flow of current between the body 420 of the negative terminal 42 and the first end cap 30, and isolate the flow of current between the first end cap 30 and the protruding portion 4211 of the negative electrode post 421, thereby avoiding short circuits and improving the reliability of the battery cell 100.

[0083] In addition, the first part 81 of the first insulating member 80 is located on the second side of the first end cap 30 and is disposed between the body 420 and the first end cap 30, which provides additional support for the negative electrode post 421 and helps improve the structural stability of the battery cell 100.

[0084] Specifically, the first insulating member 80 can be a sealing ring or a spacer block made of an insulating rubber material or an insulating plastic material. When the first insulating member 80 is a sealing ring, the first insulating member 80 can not only provide an insulating function but also provide a sealing function to seal the gap 102 between the body 420 and the first end cap 30. The body 420 and the first insulating member 80 can be connected by means of snap connection, adhesion, etc. The first insulating member 80 and the bracket of the body 420 can be connected by means of snap connection, adhesion, etc.

[0085] The first part 81 and the second part 82 can be integrally formed or separately formed. The first part 81 can be the main contour shape part of the first insulating member 80, and the second part 82 can be a structure protruding from the first part 81.

[0086] During assembly, there can be a gap between the protruding portion 4211 and the second mounting hole 32. The second part 82 can be sleeved on the protruding portion 4211 and fill the above-mentioned gap.

[0087] In one embodiment, the body 420 can be in a circular ring shape, the first insulating member 80 has a circular groove with a size adapted to the body 420, and the body 420 can be fixed in the groove. The body 420 and the first insulating member 80 can be fixed by means of hot melt connection.

[0088] Please refer to Figure 6 , in some embodiments, the first end cap 30 is provided with a first connection hole 33, and the first insulating member 80 includes a third part 83 connected to the first part 81, and the third part 83 is snap-connected to the first connection hole 33.

[0089] In this way, through the snap connection between the first connection hole 33 provided on the first end cap 30 and the third part 83 of the first insulating member 80, the fixing of the insulating member at the end cap position is enhanced, ensuring the stability of the insulating member in the battery cell 100.

[0090] In addition, the snap connection structure can be disassembled and reinstalled conveniently, facilitating the maintenance or replacement of the first insulating member 80 and improving the maintainability of the battery cell 100.

[0091] Specifically, the first connection hole 33 may be a through hole or a blind hole extending in the thickness direction of the first end cap 30. The shape of the first connection hole 33 may be a regular shape such as a circle or a square, or an irregular shape.

[0092] Please refer to Figure 6 , in some embodiments, the battery cell 100 further includes a second insulating member 90. The second insulating member 90 is located on the first side of the first end cap 30 and is disposed between the first end cap 30 and the second connection portion 4210. The second insulating member 90 is provided with a through hole 91. The through hole 91 and the second mounting hole 32 are arranged in sequence along the extending direction of the protruding portion 4211. The protruding portion 4211 passes through the second mounting hole 32 and the through hole 91. Wherein, the extending direction of the protruding portion 4211 may be the same as the thickness direction of the first end cap 30.

[0093] In this way, the second insulating member 90 can isolate the flow of current between the second connection portion 4210 of the negative electrode post 421 and the first end cap 30, and isolate the flow of current between the first end 21 of the electrode assembly 20 and the first end cap 30, thereby avoiding short circuit and improving the reliability of the battery cell 100.

[0094] Specifically, the second insulating member 90 may be an insulating spacer or insulating plate made of insulating rubber material or insulating plastic material. The second insulating member 90 can be connected to the first end cap 30 by hot melting, bonding or other means.

[0095] The through hole 91 may be a through hole extending in the thickness direction of the second insulating member 90. The shape of the through hole 91 may be a regular shape such as a circle or a square, or an irregular shape. Wherein, the thickness direction of the second insulating member 90 may be the same as the thickness direction of the first end cap 30.

[0096] The second insulating member 90 may be disposed between the first end cap 30 and the second connection portion 4210. The second insulating member 90 may be in contact with the surface of the first end cap 30 close to the electrode assembly 20. The second insulating member 90 may be in contact with the surface of the second connection portion 4210 away from the electrode assembly 20, or may be spaced from the surface of the second connection portion 4210 away from the electrode assembly 20.

[0097] In some embodiments, the through hole 91, the second mounting hole 32 and the third mounting hole 4200 are arranged in sequence along the extending direction of the protruding portion 4211. The protruding portion 4211 passes through the second mounting hole 32, the third mounting hole 4200 and the through hole 91.

[0098] Please refer to Figure 6, in some embodiments, there is a gap 102 between the second insulating member 90, the second connecting portion 4210 and the first end cap 30. The battery cell 100 further includes a seal 103, and at least a part of the seal 103 is located in the through hole 91. The seal 103 is used to seal the gap 102.

[0099] In this way, by providing the seal 103 between the second insulating member 90, the second connecting portion 4210 and the first end cap 30, the gap 102 between these components can be effectively sealed, so as to prevent external substances, such as water, dust, etc., from entering the interior of the housing 10 through the through hole 91.

[0100] Specifically, the aperture of the through hole 91 can be larger than the aperture of the second mounting hole 32 to facilitate the setting of the seal 103. The seal 103 can be a sealing ring or a sealing pad made of materials such as rubber, silicone resin, etc. The seal 103 can abut against two opposite surfaces of the first end cap 30 and the second connecting portion 4210 to seal the gap 102.

[0101] Please refer to Figure 1 and Figure 2 , in some embodiments, the first end cap 30 is provided with a first weak portion 34, and the second end cap 50 is provided with a second weak portion 51.

[0102] It can be understood that when the battery cell 100 undergoes thermal runaway, the pressure inside the housing 10 increases, and the first weak portion 34 and the second weak portion 51 can rupture to achieve pressure relief and can dissipate the heat inside the housing 10. Since both the first end cap 30 and the second end cap 50 are provided with weak portions, the heat dissipation effect is better.

[0103] Specifically, the first weak portion 34 and the second weak portion 51 are configured to rupture when the internal temperature or pressure of the housing 10 exceeds a threshold value, so as to achieve pressure relief and heat dissipation. The number of the first weak portion 34 and the second weak portion 51 can be one or more.

[0104] The first weak portion 34 and the second weak portion 51 can be formed by thinning the material, such as making indentations, grooving, etc. on the first end cap 30 and the second end cap 50. On the first end cap 30 and the second end cap 50, the thickness of the peripheral area of the first weak portion 34 and the second weak portion 51 is greater than the thickness at the first weak portion 34 and the second weak portion 51.

[0105] In some embodiments, the first weak portion 34 and the second weak portion 51 include indentations, and the indentations can be linear. When the internal temperature or pressure of the battery cell 100 exceeds the threshold value, the weak portion is torn and broken at the indentation, so as to achieve pressure relief and heat dissipation.

[0106] Please refer to Figure 1 and Figure 2, in some embodiments, the first end cap 30 is provided with a second connection hole 35, the second end cap 50 is provided with a third connection hole 52, the first weak portion 34 includes a first explosion-proof valve 340, the second weak portion 51 includes a second explosion-proof valve 510, the first explosion-proof valve 340 is installed in the second connection hole 35, and the second explosion-proof valve 510 is installed in the third connection hole 52.

[0107] Thus, the first explosion-proof valve 340 and the second explosion-proof valve 510, as structured components, provide a more reliable overpressure protection mechanism. The first explosion-proof valve 340 and the second explosion-proof valve 510 can open at a specific pressure to release the pressure without completely damaging the first end cap 30 and the second end cap 50.

[0108] Specifically, the second connection hole 35 can be a through hole or a blind hole extending along the thickness direction of the first end cap 30. The shape of the second connection hole 35 can be a regular shape such as a circle or a square, or an irregular shape. The third connection hole 52 can be a through hole or a blind hole extending along the thickness direction of the second end cap 50. The shape of the third connection hole 52 can be a regular shape such as a circle or a square, or an irregular shape. Among them, the thickness direction of the second end cap 50 can be the same as the thickness direction of the first end cap 30.

[0109] The first explosion-proof valve 340 and the second explosion-proof valve 510 can be closed rings, such as circular rings, rectangular rings, etc. The internal area surrounded by them and the annular area where the first explosion-proof valve 340 and the second explosion-proof valve 510 are located form a pressure relief area, or the internal area surrounded by them, the areas where the first explosion-proof valve 340 and the second explosion-proof valve 510 are located, and a certain range outside the first explosion-proof valve 340 and the second explosion-proof valve 510 form a pressure relief area.

[0110] When the internal temperature or pressure of the housing 10 exceeds the threshold, part or all of the first explosion-proof valve 340 and the second explosion-proof valve 510 are torn, so that the pressure relief area turns up relative to other areas of the first end cap 30 and the second end cap 50 or the pressure relief area is separated from the first end cap 30 and the second end cap 50 to more quickly achieve pressure relief.

[0111] Please refer to Figure 3 , in some embodiments, there is an included angle e between the first explosion-proof valve 340 and the second explosion-proof valve 510, and the included angle e is less than 10°. For example, the included angle e can be 1°, 3°, 5°, 7°, 9°, etc.

[0112] In this way, having a specific included angle e between the first explosion-proof valve 340 and the second explosion-proof valve 510 can provide an anti-mistake design, thereby preventing the first explosion-proof valve 340 and the second explosion-proof valve 510 from being wrongly installed or reversely installed during the assembly of the battery cell 100, and ensuring the correct positions and directions of the first explosion-proof valve 340 and the second explosion-proof valve 510. In addition, an included angle e less than 10° can avoid the problem that the first explosion-proof valve 340 or the second explosion-proof valve 510 is blocked by other structures and causes the function to fail.

[0113] Specifically, the included angle e between the first explosion-proof valve 340 and the second explosion-proof valve 510 refers to the angle between the line connecting the geometric center of the orthographic projection of the first explosion-proof valve 340 and the geometric center of the orthographic projection of the first end cap 30 and the line connecting the geometric center of the orthographic projection of the second explosion-proof valve 510 and the geometric center of the orthographic projection of the first end cap 30.

[0114] In some embodiments, the positive terminal 41 and the first end cap 30 are integrally formed.

[0115] In this way, the integral formation provides a more stable and firm connection, avoiding connection failure between the positive terminal 41 and the first end cap 30. Moreover, the integral formation reduces the possible gaps when the positive terminal 41 is connected to the first end cap 30, which helps to improve the sealing performance of the battery cell 100, prevent electrolyte leakage or external substances from invading. In addition, the integral formation can improve production efficiency, thereby reducing the overall production cost of the battery cell 100.

[0116] Please refer to Figure 1 、 Figure 2 and Figure 6 , in a specific embodiment, the positive terminal 41 can be welded to the first end cap 30, and the first explosion-proof valve 340 can be installed into the second connection hole 35. The negative terminal 42, the first insulating member 80, the first end cap 30, the second insulating member 90, and the sealing member 103 can be assembled together by a riveting process. The first current collector 60 can be welded to the negative electrode post 421. The second current collector 70 can be welded to the second end cap 50, and the second explosion-proof valve 510 can be installed into the third connection hole 52.

[0117] The first end 21 and the second end 22 of the electrode assembly 20 can be made by a process of flattening or stacking and cutting, and after being made, they are installed into the housing 10. The second end 22 of the electrode assembly 20 can be welded to the second current collector 70. The first end 21 of the electrode assembly 20 can be welded to the first current collector 60. The first end cap 30 can be welded to the first end 11 of the housing 10, and the second end cap 50 can be welded to the second end 12 of the housing 10.

[0118] The housing 10 may be provided with a liquid injection port 13. The electrolyte can be injected into the interior of the housing 10 through the liquid injection port 13. After the liquid injection is completed, the liquid injection port 13 is welded and sealed. After the electrolyte is injected into the interior of the housing 10, it can be evenly distributed to the end face of the electrode assembly 20 through the liquid passing holes 101.

[0119] Please refer to Figure 1 and Figure 8 The battery module 200 according to the embodiment of the present invention includes the battery cell 100 of any one of the above embodiments.

[0120] Since the battery module 200 includes the above-mentioned battery cell 100, it includes at least all the beneficial effects of the above-mentioned battery cell 100, which will not be elaborated here.

[0121] Specifically, the battery module 200 includes a box body 210 for encapsulating one or more battery cells 100. A plurality of battery cells 100 can be accommodated in the box body 210, and the box body 210 can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells 100. As a carrier of the battery cells 100, the box body 210 plays a key role in the safe operation and protection of the battery cells 100. The box body 210 needs to meet the requirements of strength and stiffness as well as the protection grade requirements of the electrical equipment shell, and at the same time provide collision protection.

[0122] Please refer to Figure 1 、 Figure 8 and Figure 9 The electrical equipment 300 according to the embodiment of the present invention includes the battery cell 100 of any one of the above embodiments or the battery module 200 of the above embodiment.

[0123] Since the electrical equipment 300 includes the above-mentioned battery module 200 or battery cell 100, it includes at least all the beneficial effects of the above-mentioned battery module 200 or battery cell 100, which will not be elaborated here.

[0124] Specifically, the electrical equipment 300 can use the battery module 200 or the battery cell 100 as a power source. The electrical equipment 300 can be, but is not limited to, portable energy storage devices, power banks, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, and so on.

[0125] Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0126] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "certain embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0127] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: The battery cell comprises: case; an electrode assembly, wherein the electrode assembly is disposed in the housing; A first end cover, the first end cover is arranged at the first end of the housing and is provided with a first mounting hole and a second mounting hole; An electrode terminal, the electrode terminal comprising a positive terminal and a negative terminal, the positive terminal and the negative terminal are both mounted on the first end cover; The positive terminal comprises a first connecting portion and a positive electrode column protruding from the first connecting portion, the first connecting portion is located on a first side of the first end cover, the positive electrode column is passed through the first mounting hole, and at least part of the positive electrode column is located on a second side of the first end cover; The negative terminal includes a body and a negative pole, wherein the body is located on the second side of the first end cover, and the negative pole is passed through the second mounting hole and connected to the body.

2. The battery cell according to claim 1, characterized in that: The negative electrode column includes a second connecting portion and a protruding portion protruding from the second connecting portion, the second connecting portion is located on the first side of the first end cover, the second connecting portion is conductively connected to the electrode assembly, and the protruding portion passes through the second mounting hole and is connected to the body.

3. The battery cell according to claim 2, characterized in that: The positive terminal is conductively connected to the first end cover, the negative terminal is insulated and installed on the first end cover, the first end cover is conductively connected to the second end of the electrode assembly, the battery cell also includes a second end cover, a first current collector and a second current collector, the second end cover is arranged at the second end of the shell, the first current collector is conductively connected to the first end of the electrode assembly, the first current collector is conductively connected to the second connecting portion, the second current collector is conductively connected to the second end of the electrode assembly, the second current collector is conductively connected to the second end cover, and the first end of the electrode assembly and the second end of the electrode assembly output currents of different polarities.

4. The battery cell according to claim 3, characterized in that: The first current collecting member and the second current collecting member are both provided with liquid passing holes.

5. The battery cell according to claim 3, characterized in that: The battery cell also includes a first insulating member, and the body is installed on the first end cover through the first insulating member. The first insulating member includes a first part and a second part connected to the first part. The first part is located on the second side of the first end cover and is arranged between the body and the first end cover; the second part is passed through the second mounting hole and is sleeved on the protrusion.

6. The battery cell according to claim 5, characterized in that: The first end cover is provided with a first connecting hole, and the first insulating member includes a third portion connected to the first portion, and the third portion is engaged with the first connecting hole.

7. The battery cell according to claim 3, characterized in that: The battery cell also includes a second insulating member, which is located on the first side of the first end cover and is arranged between the first end cover and the second connecting portion. The second insulating member is provided with a through hole, and the through hole and the second mounting hole are arranged in sequence along the extension direction of the protrusion, and the protrusion is penetrated by the second mounting hole and the through hole.

8. The battery cell according to claim 7, characterized in that: There is a gap between the second insulating member, the second connecting portion and the first end cover. The battery cell further includes a sealing member, at least a portion of which is located in the via hole, and the sealing member is used to seal the gap.

9. The battery cell according to claim 1, characterized in that: The battery cell further includes a second end cover, which is disposed at the second end of the housing, the first end cover is provided with a first weak portion, and the second end cover is provided with a second weak portion.

10. The battery cell according to claim 9, characterized in that: The first end cover is provided with a second connecting hole, the second end cover is provided with a third connecting hole, the first weak portion includes a first explosion-proof valve, the second weak portion includes a second explosion-proof valve, the first explosion-proof valve is installed in the second connecting hole, and the second explosion-proof valve is installed in the third connecting hole.

11. The battery cell according to claim 10, characterized in that: An included angle is formed between the first explosion-proof valve and the second explosion-proof valve, and the included angle is less than 10°.

12. The battery cell according to claim 1, characterized in that: The positive terminal and the first end cover are integrally formed.

13. A battery module, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 12.

14. An electrical device, characterized in that: It comprises the battery cell according to any one of claims 1 to 12 or the battery module according to claim 13.

Images