Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, a battery monomer body, an anti-explosion valve and a collector plate. An accommodating space is formed in the shell, and a cover plate is arranged on one side of the accommodating space; the battery monomer body is arranged in the accommodating space and is provided with an exhaust channel; the anti-explosion valve is arranged in the containing space and arranged on the cover plate. The collector plate is arranged on one side of the single battery body, covers one end of the exhaust channel and is provided with a fusible area, the fusible area covers at least part of one end of the exhaust channel, and the explosion-proof valve covers the fusible area. By adopting the structure, when the battery monomers are in thermal runaway, high-temperature flue gas can melt the meltable area of the current collecting disc, so that a larger flue gas channel is leaked from the current collecting disc, and the flue gas can trigger the anti-explosion valve on the cover plate after penetrating through the flue gas channel, so that the flue gas can be discharged to the outside of the battery monomers in time, the risk of non-directional pressure relief is reduced, and the service life of the battery monomers is prolonged. And the safety of the battery monomer is improved.

Description

TECHNICAL FIELD

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

[0002] The battery device generally comprises a box body and a plurality of battery monomers arranged in the box body, and the plurality of battery monomers are connected in series or in parallel to form a battery module. Among them, the existing battery monomer, when the battery monomer is in thermal runaway, the smoke in the battery monomer is difficult to be discharged in time, which easily causes the risk of non-directional pressure relief. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the present application provides a battery monomer, a battery device and a power utilization device, which can discharge the smoke in the battery monomer in time when the battery monomer is in thermal runaway, and improve the safety of the battery monomer.

[0004] To solve the above technical problems, one technical scheme adopted by the present application is to provide a battery monomer, which comprises a shell, a battery monomer body, an explosion-proof valve and a current collector. The shell forms an accommodation space, and a cover plate is arranged on one side of the accommodation space; the battery monomer body is arranged in the accommodation space, and the battery monomer body has an exhaust passage; the explosion-proof valve is arranged in the accommodation space, and the explosion-proof valve is arranged on the cover plate; the current collector is arranged on one side of the battery monomer body, the current collector covers one end of the exhaust passage, the current collector has a fusible area, the fusible area covers at least part of one end of the exhaust passage, and the explosion-proof valve covers the fusible area.

[0005] The battery monomer with the above structure has a fusible area in the current collector, and the explosion-proof valve covers the fusible area. When the battery monomer is in thermal runaway, the high-temperature smoke will melt the fusible area of the current collector, so that the current collector leaks a large smoke passage, and the smoke can pass through the smoke passage to trigger the explosion-proof valve on the cover plate, so that the smoke can be discharged to the outside of the battery monomer in time, reducing the risk of non-directional pressure relief and improving the safety of the battery monomer.

[0006] In one possible implementation, the current collector comprises a metal area, the metal area connects the fusible area, and the metal area is welded with the battery monomer body.

[0007] The current collector can be fixed on the battery monomer body through the metal area, the current collector can conduct current to the outside through the metal area, and the fusible area can melt to form a large smoke passage when thermal runaway occurs.

[0008] In a possible implementation, the current collecting plate comprises: a plastic piece connecting the metal area, the metal area having a flue gas passage, the plastic piece covering the flue gas passage, the plastic piece being the fusible area at a portion of the flue gas passage, the fusible area having a melting point less than 250 degrees Celsius.

[0009] The above can make the fusible area be in a solid state when the battery monomer is in a normal temperature range, increase the strength of the current collecting plate, reduce the possibility of mis-melting of the fusible area, and easily melt the fusible area by high-temperature flue gas.

[0010] In a possible implementation, the metal area is hot-melt connected with the plastic piece.

[0011] The above hot-melt can connect and fix the fusible area of the plastic and the metal area together. The current collecting plate has good integrity.

[0012] In a possible implementation, the thickness of the fusible area ranges from 0.8 millimeter to 1.5 millimeter.

[0013] The above thickness of the fusible area can have sufficient strength when the battery monomer is in a normal temperature range, and the fusible area can be completely melted faster when the battery monomer is in thermal runaway.

[0014] In a possible implementation, the thickness ranges from 1 millimeter to 1.2 millimeter.

[0015] The above thickness can better make the fusible area have sufficient strength and facilitate the melting of the fusible area.

[0016] In a possible implementation, the metal area is annular, and the fusible area is located at the center of the metal area.

[0017] The above can better facilitate the alignment of the fusible area and the exhaust passage formed on the battery monomer body, and can also make the metal area and the fusible area have a larger connection area.

[0018] In a possible implementation, the fusible area completely covers one end of the exhaust passage.

[0019] The above can completely leak out of the exhaust passage after the fusible area is melted, facilitating the exhaust of high-temperature gas.

[0020] In a possible implementation, the ratio of the area of the fusible area to the area of the current collecting plate ranges from 0.25 to 0.5.

[0021] The above ratio is not less than 0.25, so that the flue gas passage formed after the fusible area is melted is large enough to quickly exhaust flue gas. The ratio is not greater than 0.5, so that the current collecting plate can have a large enough metal area to conduct current.

[0022] In a possible implementation, the fusible area is circular.

[0023] In the above, the fusible area is circular, and the circular smoke passage is formed after the fusible area is melted, so that the smoke can flow more smoothly and the vortex is reduced.

[0024] In a possible implementation, one or more sides of the fusible area are connecting portions, and the connecting portions are hot-melt connected with the metal area.

[0025] In the above, the connecting portions can increase the contact area between the fusible area and the metal area, increase the connection strength, and improve the integrity of the current collector plate.

[0026] In a possible implementation, the battery monomer body includes a tab, and the metal area includes a welding portion, and the welding portion is welded with the tab.

[0027] In the above, the metal area of the current collector plate can be in conduction with the battery monomer body, and the current collector plate can conveniently conduct the current.

[0028] In a possible implementation, the welding portion is a plurality of welding portions, the plurality of welding portions are arranged in a circumferential direction, the welding portion is in a strip shape, and the extension direction of the welding portion is from the center of the metal area to the edge of the metal area.

[0029] In the above, the conduction effect of the current collector plate and the battery monomer body can be improved.

[0030] To solve the above technical problems, another technical solution adopted by the present application is to provide a battery device, which includes one or more battery monomers, and the battery monomer is the battery monomer described above.

[0031] In the above, the current collector plate has a fusible area, and the explosion-proof valve is covered on the fusible area. When the battery monomer is in thermal runaway, the high-temperature smoke can melt the fusible area of the current collector plate, so that the current collector plate leaks a large smoke passage. The smoke can pass through the smoke passage to trigger the explosion-proof valve on the cover plate, so that the smoke can be discharged to the outside of the battery monomer in time, the risk of non-directional pressure relief is reduced, and the safety of the battery monomer is improved.

[0032] To solve the above technical problems, another technical solution adopted by the present application is to provide a power utilization device, which includes a battery device, and the battery device is the battery device described above, and the battery device is used to provide electric energy.

[0033] The above power utilization device, the current collecting disc has a meltable area, the explosion-proof valve covers the meltable area, when the battery monomer is in thermal runaway, the high-temperature flue gas can melt the meltable area of the current collecting disc, so that the current collecting disc leaks a larger flue gas passage, the flue gas can pass through the flue gas passage and trigger the explosion-proof valve on the cover plate, so that the flue gas can be discharged to the outside of the battery monomer in time, reducing the risk of non-directional pressure relief, and improving the safety of the battery monomer.

[0034] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creating laborious work.

[0036] Figure 1 Structure diagram of a vehicle according to one or more embodiments;

[0037] Figure 2 Structure diagram of a battery monomer according to some embodiments;

[0038] Figure 3 Structure diagram of a battery monomer according to some embodiments; Figure 2 Structure diagram of a current collecting disc in a battery monomer according to an embodiment;

[0039] Figure 4 Structure diagram of a current collecting disc in a battery monomer according to an embodiment; Figure 3 Structure diagram of a current collecting disc according to an embodiment;

[0040] Figure 5 Structure diagram of a current collecting disc according to an embodiment; Figure 2 Structure diagram of a current collecting disc according to another embodiment;

[0041] Figure 6 Structure diagram of a current collecting disc according to another embodiment; Figure 5 Structure diagram of a current collecting disc according to another embodiment.

[0042] Wherein, 1000, vehicle; 200, controller; 300, motor; 100, battery device; 110, battery monomer; 11, battery monomer body; 111, exhaust passage; 12, shell; 121, containing space; 122, cover plate; 13, explosion-proof valve; 14, current collecting disc; 141, meltable area; 142, metal area; 40, plastic part; 421, welding part; 143, flue gas passage; 41, connecting part. DETAILED DESCRIPTION

[0043] The embodiments of the technical solutions of the present application will be described in detail below. 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.

[0044] 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 in the specification and the claims and the above description of the drawings are intended to cover the non-exclusive inclusion.

[0045] 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, unless otherwise explicitly and specifically limited, 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).

[0046] In this paper, the "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0047] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0048] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] At present, from the development of market situation, the use of battery is more and more widely, not only the battery is applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0051] Among them, the battery device usually includes a box body and a plurality of battery monomers arranged in the box body, and the plurality of battery monomers are connected in series or parallel to form a battery module. Among them, the existing battery monomer, when the battery monomer is thermal runaway, the smoke in the battery monomer is difficult to discharge in time, which is easy to cause the risk of non-directional pressure relief.

[0052] Based on the above consideration, in order to solve the technical problem that the smoke is difficult to discharge in time when the battery monomer is thermal runaway in the prior art, the present application provides a battery monomer, a battery device and a power utilization device. The current collector plate of the battery monomer has a fusible area, and the high-temperature smoke can melt the fusible area to trigger the explosion-proof valve of the cover plate, so that the smoke can be discharged to the outside of the battery monomer in time.

[0053] The following embodiments are described for convenience with a vehicle as an example of a power utilization device according to an embodiment of the present application.

[0054] Please refer to Figure 1 , Figure 1 is a structural schematic view of a vehicle according to one or more embodiments.

[0055] The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0056] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also 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.

[0057] In order to improve the performance of the electric device, the present application provides a battery cell in a battery device, please refer to Figure 2 , Figure 2 FIG. 1 is a schematic diagram of an internal structure of a battery cell according to some embodiments.

[0058] In some embodiments, the battery cell 110 includes a housing 12, a battery cell body 11, an explosion-proof valve 13, and a current collector plate 14. The housing 12 forms an accommodation space 121, and is provided with a cover plate 122 on one side of the accommodation space 121. The battery cell body 11 is arranged in the accommodation space 121, and has an exhaust passage 111. The explosion-proof valve 13 is arranged in the accommodation space 121, and is arranged on the cover plate 122. The current collector plate 14 is arranged on one side of the battery cell body 11, covers one end of the exhaust passage 111, and has a fusable zone 141 covering at least part of the one end of the exhaust passage 111, and the explosion-proof valve 13 covers the fusable zone 141.

[0059] The battery cell body 11 is used to generate electrochemical reactions, which includes positive electrode material (not shown) and negative electrode material (not shown). In this embodiment, the battery cell body 11 is a winding structure, which includes a positive electrode sheet (not shown), a negative electrode sheet (not shown), and a separator (not shown). Among them, the positive electrode sheet, the separator, the negative electrode sheet, and the separator are sequentially stacked and wound into a cylindrical structure. In some other embodiments, the battery cell body 11 can also be in a laminated structure. In addition, in this embodiment, the battery cell body 11 and the shell 12 are in a cylindrical shape, and in some other embodiments, the battery cell body 11 and the shell 12 can also be in a rectangular shape, an irregular polygonal shape, etc. Among them, the shell 12 is used to protect the battery cell body 11, and the shell 12 is also used to provide an electrically isolated environment for the battery cell body 11. The current collector 14 is used to collect the current of the battery cell body 11 and conduct the current to the outside of the battery cell 110 through the current collector 14. In this embodiment, the current collector 14 and the explosion-proof valve 13 are located on the negative side of the battery cell body 11, and in some other embodiments, the current collector 14 and the explosion-proof valve 13 can also be arranged on the positive side of the battery cell body 11. Among them, the explosion-proof valve 13 is used to release pressure when the pressure inside the shell 12 is too high to reduce the risk of explosion of the battery cell 110. The related art provides a battery cell 110, and in the related art, the current collector is not provided with a fusible area, and in order to improve the structural reliability of the current collector, the current collector can only be designed with a small smoke passage, and when the battery cell is in thermal runaway, the smoke is difficult to pass through the current collector to trigger the explosion-proof valve. In this embodiment, the current collector 14 has a fusible area 141, which is in a solid state when the battery cell 110 is in a normal temperature range, and can make the current collector 14 have sufficient strength. When the battery cell 110 is in thermal runaway, the fusible area 141 can melt, so that the current collector 14 can leak a larger smoke passage 143, and the smoke can pass through the smoke passage 143 to trigger the explosion-proof valve 13 on the cover plate 122, so that the smoke can be discharged to the outside of the battery cell 110 in time.

[0060] Through the above structure, the current collector 14 has a fusible area 141, and the explosion-proof valve 13 covers the fusible area 141, and when the battery cell 110 is in thermal runaway, the high-temperature smoke will melt the fusible area 141 of the current collector 14, so that the current collector 14 leaks a larger smoke passage 143, and the smoke can pass through the smoke passage 143 to trigger the explosion-proof valve 13 on the cover plate 122, so that the smoke can be discharged to the outside of the battery cell 110 in time, reducing the risk of non-directional pressure relief and improving the safety of the battery cell 110.

[0061] Please refer to Figure 3 and Figure 4 , Figure 3 for Figure 2 the structure diagram of an embodiment of the current collector in a battery cell; Figure 4 for Figure 3An exploded schematic view of the structure of the current collecting plate. In some embodiments, the current collecting plate 14 comprises a metal region 142, which connects the fusible region 141, and which is welded to the battery monomer body 11.

[0062] In the present embodiment, the metal region 142 is copper, which has good chemical stability and is not prone to reaction inside the battery monomer 110. In addition, copper is an excellent conductive material and is easy to process. In other embodiments, the metal region 142 can also be made of aluminum. In the present embodiment, the negative electrode of the battery monomer body 11 also comprises a tab for leading out the current of the negative electrode sheet, and the metal region 142 of the current collecting plate 14 is specifically welded to the tab. In addition, the connection between the metal region 142 of the current collecting plate 14 and the fusible region 141 can be hot melt connection, clamping connection, fixed part connection, etc.

[0063] As described above, the current collecting plate 14 can be fixed to the battery monomer body 11 through the metal region 142, the current collecting plate 14 can conduct current to the outside through the metal region 142, and the fusible region 141 can melt to form a larger smoke passage 143 in the event of thermal runaway.

[0064] In some embodiments, the fusible region 141 is a plastic part 40, and the melting point of the fusible region 141 is less than 250 degrees Celsius.

[0065] In the present embodiment, the plastic part 40 is polypropylene, the melting point of which is 164 degrees Celsius, and the polypropylene is solid when the battery monomer 110 is in the normal temperature range, which can increase the strength of the current collecting plate 14. When the thermal runaway temperature of the battery monomer 110 reaches 164 degrees Celsius, the polypropylene can quickly melt to allow smoke to pass through. In other embodiments, the plastic part 40 can also be polycarbonate, and the melting point of polycarbonate is 220 degrees Celsius. The plastic part 40 of polycarbonate can also reach the melting temperature when the battery monomer 110 is in thermal runaway. In addition, in the present embodiment, the fusible region 141 is a plastic part 40, and in some other embodiments, the fusible region 141 can also be rubber, low-melting-point metal, resin, etc.

[0066] As described above, the fusible region 141 can be solid when the battery monomer 110 is in the normal temperature range, which can increase the strength of the current collecting plate 14, reduce the possibility of mis-melting of the fusible region 141, and the fusible region 141 can be easily melted by high-temperature smoke.

[0067] In some embodiments, the metal region 142 is hot melt connected to the plastic part 40.

[0068] The hot-melt connection can firmly connect the plastic and the metal together. In the embodiment, the plastic part 40 is locally heated at a temperature of the melting point of the plastic part 40 or slightly higher than the melting point, and then the plastic part 40 is brought into contact with the metal area 142 and a certain pressure is applied. After the plastic part 40 cools down, the metal area 142 and the plastic part 40 are connected.

[0069] As described above, the hot-melt connection of the plastic has higher connection strength, and the overall integrity of the current collector plate 14 is good.

[0070] In the embodiment, the current collector plate 14 includes the plastic part 40, the plastic part 40 connects the metal area 142, the metal area 142 has a flue gas passage 143 in the center, the plastic part 40 covers the flue gas passage 143, and the part of the plastic part 40 located in the flue gas passage 143 is the fusible area 141. The large-area plastic part 40 completely covers the flue gas passage 143 of the metal area 142 and is hot-melt connected with the metal area 142 together, wherein the area of the plastic part 40 located in the flue gas passage 143 is the fusible area 141.

[0071] In some embodiments, the thickness of the fusible area 141 ranges from 0.8 mm to 1.5 mm.

[0072] In the embodiment, the thickness of the fusible area 141 is 1 mm. In some other embodiments, the thickness of the fusible area 141 can also be 0.8 mm, 0.9 mm, 1.3 mm, 1.5 mm, etc. In some preferred embodiments, the thickness of the fusible area 141 ranges from 1 mm to 1.2 mm. For example, the thickness of the fusible area 141 can be 1 mm, 1.05 mm, 1.15 mm, 1.2 mm, etc.

[0073] When the fusible area 141 has the above thickness, it can have sufficient strength and facilitate the melting of the fusible area 141 when the battery monomer 110 is in thermal runaway.

[0074] Further, in some embodiments, the thickness of the fusible area 141 is not greater than the thickness of the metal area 142.

[0075] In the embodiment, the thickness of the fusible area 141 is 1 mm. The thickness of the metal area 142 can be 1 mm, 1.1 mm, 1.2 mm, etc. The thickness of the fusible area 141 is not greater than the thickness of the metal area 142, which on the one hand facilitates the melting of the fusible area 141 at high temperature, and on the other hand, the fusible area 141 does not affect the connection of the metal area 142 to the battery monomer body 11.

[0076] In some embodiments, the metal area 142 is annular, and the fusible area 141 is located in the center of the metal area 142.

[0077] In the embodiment, the battery cell body 11 is in a cylindrical shape in a winding type, and the current collecting plate 14 is arranged on a bottom surface of the battery cell body 11, wherein the metal area 142 is in a circular ring shape, so that the shape of the current collecting plate 14 can be adapted to the shape of the bottom surface of the battery cell body 11. In other embodiments, the metal area 142 can also be in a rectangular ring shape, an irregular polygon ring shape, etc.

[0078] As described above, the fusible area 141 is located in the center of the metal area 142, which is more convenient for the fusible area 141 to be aligned with the exhaust passage 111 formed on the battery cell body 11, and can also make the metal area 142 have a larger connection area with the fusible area 141.

[0079] In some embodiments, the fusible area 141 completely covers one end of the exhaust passage 111.

[0080] In the embodiment, the fusible area 141 completely covers one end of the exhaust passage 111, that is, after the fusible area 141 is melted, the smoke passage 143 can completely leak out of the exhaust passage 111 of the battery cell body 11, so that the high-temperature smoke can be more quickly discharged from the battery cell body 11 to trigger the explosion-proof valve 13 through the current collecting plate 14. In other embodiments, the fusible area 141 can also partially cover the opening of one end of the exhaust passage 111.

[0081] As described above, after the fusible area 141 is melted, it can completely leak out of the exhaust passage 111, which is convenient for the discharge of high-temperature gas.

[0082] In some embodiments, the ratio of the area of the fusible area 141 to the area of the current collecting plate 14 ranges from 0.25 to 0.5.

[0083] In the embodiment, the ratio of the area of the fusible area 141 to the area of the current collecting plate 14 is 0.25. In some other embodiments, the ratio of the area of the fusible area 141 to the area of the current collecting plate 14 can also be 0.3, 0.4, 0.5, etc. other reasonable values. Among them, the ratio of the area of the fusible area 141 to the area of the current collecting plate 14 is not less than 0.25, so that the fusible area 141 has sufficient area, and after the fusible area 141 is melted, the high-temperature smoke can be quickly discharged through the smoke passage 143. The ratio of the area of the fusible area 141 to the area of the current collecting plate 14 ranges from 0.5, so that the metal area 142 of the current collecting plate 14 has sufficient area, and the metal area 142 can conduct current.

[0084] As described above, the ratio is not less than 0.25, so that the smoke passage 143 formed after the fusible area 141 is melted is large enough to quickly discharge the smoke. The ratio is not greater than 0.5, so that the current collecting plate 14 has a large enough area of the metal area 142 to conduct current.

[0085] In some embodiments, the fusible area 141 is circular.

[0086] In the embodiment, the exhaust passage 111 on the battery cell body 11 is in the shape of a cylinder. The shape is set so that the high-temperature flue gas flows more smoothly and is less likely to generate turbulence and vortex, making the flue gas discharge more smooth. The fusible area 141 is in the shape of a circle, and after the fusible area 141 melts, the flue gas passage 143 on the current collector plate 14 is also in the shape of a circle, which can make the high-temperature flue gas flow smoothly and facilitate the alignment of the flue gas passage 143 and the exhaust passage 111. In other embodiments, the fusible area 141 can also be in the shape of a square, a triangle, an irregular polygon, or other reasonable shapes.

[0087] As described above, the fusible area 141 is in the shape of a circle, and after the fusible area 141 melts, the flue gas passage 143 in the shape of a circle is formed, which can make the flue gas flow more smoothly and reduce vortex.

[0088] Please refer to Figure 5 and Figure 6 , Figure 5 for Figure 2 the structure of another embodiment of the current collector plate in a battery cell; Figure 6 for Figure 5 the structure of another embodiment of the current collector plate in a battery cell;

[0089] The connection part 41 and the fusible area 141 are integrally formed, and in the embodiment, the connection part 41 and the fusible area 141 are both plastic parts 40. The fusible area 141 is circumferentially spaced apart by four connection parts 41. The connection part 41 is used to be thermally fused with the metal area 142, and the connection part 41 can increase the connection area of the fusible area 141 and the metal area 142 and increase the strength of the current collector plate 14. In some other embodiments, the number of connection parts 41 can also be one, two, five, or other reasonable numbers. In addition, in the embodiment, the connection part 41 is in the shape of a long strip, and in some other embodiments, the connection part 41 can also be in the shape of a circle, a triangle, an irregular polygon, or other shapes.

[0090] As described above, the connection part 41 can increase the contact area of the fusible area 141 and the metal area 142 and increase the connection strength, and the current collector plate 14 has better integrity.

[0091] In some embodiments, the battery cell body 11 includes a tab, and the metal area 142 includes a welding part 421 that is welded with the tab.

[0092] In the embodiment, the tab is used to connect the negative tab of the battery monomer body 11, and the tab is welded with the metal area 142 to guide the current to the current collector 14 through the tab. Among them, the number of welding portions 421 is multiple, and the multiple welding portions 421 are arranged circumferentially. In some other embodiments, only one welding portion 421 can be provided. In the embodiment, the multiple welding portions 421 are arranged circumferentially, the welding portion 421 is in a strip shape, and the extension direction of the welding portion 421 is from the center of the metal area 142 to the edge of the metal area 142. In some other embodiments, the shape of the welding portion 421 can also be circular, triangular, irregular polygon, etc.

[0093] The welding of the current collector 14 and the battery monomer body 11 is better in conduction effect.

[0094] The application also provides a battery device 100, which comprises one or more battery monomers 110, and the battery monomer 110 is the battery monomer 110 described in any of the above embodiments.

[0095] The battery device 100 has the fusible area 141 of the current collector 14, and the explosion-proof valve 13 covers the fusible area 141. When the battery monomer 110 is in thermal runaway, the high-temperature smoke melts the fusible area 141 of the current collector 14, so that the current collector 14 leaks a large smoke passage 143, and the smoke can pass through the smoke passage 143 to trigger the explosion-proof valve 13 on the cover plate 122, so that the smoke can be discharged to the outside of the battery monomer 110 in time, reducing the risk of non-directional pressure relief and improving the safety of the battery monomer 110.

[0096] The application also provides a power utilization device. The power utilization device comprises the battery device 100. It should be noted that the battery device 100 in the embodiment is the battery device 100 described in the above embodiments, which will not be described here.

[0097] The battery device 100 has the fusible area 141 of the current collector 14, and the explosion-proof valve 13 covers the fusible area 141. When the battery monomer 110 is in thermal runaway, the high-temperature smoke melts the fusible area 141 of the current collector 14, so that the current collector 14 leaks a large smoke passage 143, and the smoke can pass through the smoke passage 143 to trigger the explosion-proof valve 13 on the cover plate 122, so that the smoke can be discharged to the outside of the battery monomer 110 in time, reducing the risk of non-directional pressure relief and improving the safety of the battery monomer 110.

[0098] Finally, in a specific application scenario, in view of the problem that the smoke in the existing battery monomer 110 is difficult to be discharged in time and is prone to non-directional pressure relief risk. The battery monomer 110 of the application includes a shell 12, a battery monomer body 11, an explosion-proof valve 13 and a current collector plate 14. The shell 12 forms a containing space 121, and a cover plate 122 is arranged on one side of the containing space 121; the battery monomer body 11 is arranged in the containing space 121, and the battery monomer body 11 has an exhaust passage 111; the explosion-proof valve 13 is arranged in the containing space 121, and the explosion-proof valve 13 is arranged on the cover plate 122; the current collector plate 14 is arranged on one side of the battery monomer body 11, the current collector plate 14 covers one end of the exhaust passage 111, and the current collector plate 14 has a fusible area 141, the fusible area 141 covers at least part of one end of the exhaust passage 111, and the explosion-proof valve 13 covers the fusible area 141. The current collector plate 14 includes a metal area 142, the metal area 142 is connected to the fusible area 141, and the metal area 142 is welded to the battery monomer body 11. The fusible area 141 is a plastic piece 40, and the melting point of the fusible area 141 is less than 250 degrees Celsius. The metal area 142 is hot melt connected to the plastic piece 40. The thickness of the fusible area 141 is 1 millimeter. The metal area 142 is annular, and the fusible area 141 is located in the center of the metal area 142. The fusible area 141 completely covers one end of the exhaust passage 111. The fusible area 141 has a plurality of sides connected to the metal area 142.

[0099] In the foregoing manner, the current collector plate 14 has the fusible area 141, and the explosion-proof valve 13 covers the fusible area 141. When the battery monomer 110 is in thermal runaway, the high-temperature smoke will melt the fusible area 141 of the current collector plate 14, so that the current collector plate 14 leaks a large smoke passage 143, and the smoke can pass through the smoke passage 143 to trigger the explosion-proof valve 13 on the cover plate 122, so that the smoke can be discharged to the outside of the battery monomer 110 in time, reducing the risk of non-directional pressure relief and improving the safety of the battery monomer 110.

[0100] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and description of the application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing forming a receiving space and provided with a cover plate on one side of the receiving space; a battery cell body provided in the receiving space, the battery cell body having an exhaust passage; an explosion-proof valve provided in the receiving space, the explosion-proof valve being provided on the cover plate; a current collector plate provided on one side of the battery cell body, the current collector plate covering one end of the exhaust passage, the current collector plate having a fusible region, the fusible region covering at least part of one end of the exhaust passage, the explosion-proof valve covering the fusible region.

2. The battery cell according to claim 1, wherein the current collector plate comprises a metal region, the metal region being connected to the fusible region, the metal region being welded to the battery cell body.

3. The battery cell of claim 2, wherein, the current collector plate comprises: a plastic piece connected to the metal region, the metal region having a flue passage, the plastic piece covering the flue passage, a portion of the plastic piece located in the flue passage being the fusible region, the fusible region having a melting point less than 250 degrees Celsius.

4. The battery cell according to claim 3, wherein the metal region is heat-fused to the plastic piece.

5. The battery cell according to claim 3, wherein the thickness of the fusible region ranges from 0.8 mm to 1.5 mm.

6. The battery cell according to claim 5, wherein the thickness ranges from 1 mm to 1.2 mm.

7. The battery cell according to claim 2, wherein the metal region is annular, and the fusible region is located in the center of the metal region.

8. The battery cell according to claim 7, wherein the fusible region completely covers one end of the exhaust passage.

9. The battery cell according to claim 7, wherein the ratio of the area of the fusible region to the area of the current collector plate ranges from 0.25 to 0.

5.

10. The battery cell according to claim 7, wherein the fusible region is circular.

11. The battery cell according to claim 7, wherein one or more sides of the fusible region are connecting portions, the connecting portions being heat-fused to the metal region.

12. The battery cell according to claim 2, wherein the battery cell body comprises a tab, and the metal region comprises a welding portion, the welding portion being welded to the tab.

13. The battery cell according to claim 12, wherein the welding portion is in a plurality, the plurality of welding portions being arranged in a circumferential direction, the welding portion being in a strip shape, and the welding portion extending from the center of the metal region to the edge of the metal region.

14. A battery device characterized by comprising: The battery device comprises one or more battery cells, the battery cell being the battery cell according to any one of claims 1-13.

15. An electrical device, comprising: The electric device comprises the battery device according to claim 14, the battery device being used to provide electric energy.

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