Battery cell, battery device and electric device

Abstract

The utility model provides a battery cell, a battery device and a power utilization device. The battery monomer comprises an electrode terminal, the electrode terminal comprises a body part, a connecting part and an insulating part arranged between the body part and the connecting part, the body part is at least partially arranged in the connecting part, the connecting part is provided with a through hole, and the insulating part comprises an insulating part body wrapping the connecting part; and the bulge is arranged on the periphery of the insulating part body far away from the body part and is arranged opposite to the through hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, and more particularly to a battery cell, a battery device, and a power utilization device. BACKGROUND

[0002] In recent years, with the rapid development of new energy technology, new energy vehicles are increasingly widely used and gradually replace traditional fuel vehicles to become one of the mainstream transportation tools. As the power source of new energy vehicles, power batteries are one of the core equipment of new energy vehicles. Therefore, the safety performance of power batteries has become the focus of attention.

[0003] With the development of battery technology, the life and safety problems of battery cells need to be solved urgently. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide a battery cell, a battery device, and a power utilization device, which can effectively improve the life of the battery cell and help solve the safety problem of the battery cell.

[0005] In a first aspect of the present application, a battery cell is provided. The battery cell includes an electrode terminal, the electrode terminal including a body portion, a connecting portion, and an insulating portion provided between the body portion and the connecting portion, the body portion being at least partially provided in the connecting portion, the connecting portion having a through hole, and the insulating portion including an insulating portion body covering the connecting portion and a protrusion provided at the outer periphery of the insulating portion body away from the body portion and oppositely arranged with the through hole.

[0006] By oppositely arranging the protrusion provided at the outer periphery of the insulating portion body away from the body portion with the through hole, the strength of the region near the through hole of the connecting portion in the insulating portion can be locally strengthened, thereby avoiding stress concentration in this region.

[0007] In some embodiments, the protrusion completely covers the corresponding through hole.

[0008] By making the protrusion completely cover the corresponding through hole, stress concentration can be further avoided.

[0009] In some embodiments, the number of protrusions is the same as the number of through holes.

[0010] By making the number of protrusions the same as the number of through holes, stress concentration at each through hole can be avoided.

[0011] In some embodiments, the protrusions are formed along the entire periphery of the insulating portion body.

[0012] By forming the protrusion along the entire circumference of the insulating portion body, the strength of the insulating portion can be further enhanced, and since it is formed along the entire circumference, the forming mold and process are simpler.

[0013] In some embodiments, the size of the protrusion in the height direction is not higher than the upper surface of the insulating portion body.

[0014] By making the size of the protrusion in the height direction not higher than the upper surface of the insulating portion body, the external space of the electrode terminal can be saved, and the connection is facilitated when the busbar components are connected in series, parallel, or mixed connection.

[0015] In some embodiments, the through holes are symmetrically arranged in the circumferential direction of the connecting portion.

[0016] By symmetrically arranging the through holes in the circumferential direction of the connecting portion, the injection molding operation of the insulating portion can be more efficient, and the stress is more uniform.

[0017] In some embodiments, the body portion has at least one groove in the circumferential direction.

[0018] By the body portion having at least one groove in the circumferential direction, the flow path can be facilitated. Here, the groove plays the role of a flow channel.

[0019] In some embodiments, the position of the groove in the circumferential direction of the body portion is opposite to the position of at least one of the through holes of the connecting portion.

[0020] By the position of the groove in the circumferential direction of the body portion being opposite to the position of at least one of the through holes of the connecting portion, the length of the flow path can be shortened.

[0021] In some embodiments, the number of grooves is the same as the number of through holes of the connecting portion.

[0022] By making the number of grooves the same as the number of through holes of the connecting portion, the length of the flow path can be further shortened.

[0023] In some embodiments, the battery monomer includes a shell, the electrode terminal is arranged in the shell, the body portion is at least partially arranged between the connecting portion and the shell, and the connecting portion is connected to the shell.

[0024] In the second aspect of the present application, a battery device is provided, which includes the above-mentioned battery monomer.

[0025] By improving the service life of the battery monomer itself, the service life of the battery device including the above-mentioned battery monomer is also improved.

[0026] In a third aspect of the present application, a power consuming device is provided, which includes the above battery device.

[0027] By improving the service life of the battery cell and the battery device, the working time of the power consuming device is prolonged, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] These and various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustration only and are not intended to limit the application thereto. Like reference numerals are used to refer to like elements throughout the several views of the drawings.

[0029] Figure 1 is a schematic exploded perspective view of an electrode terminal disclosed in an embodiment of the present application.

[0030] Figure 2 is a schematic overall perspective view of an electrode terminal disclosed in an embodiment of the present application.

[0031] Figure 3 is a schematic perspective view of an electrode terminal disclosed in another embodiment of the present application. Figure 2 A-A sectional view thereof.

[0032] Figure 4 is a schematic overall perspective view of an electrode terminal disclosed in another embodiment of the present application.

[0033] Figure 5 is a schematic perspective view of a battery cell including an electrode terminal disclosed in an embodiment of the present application.

[0034] Figure 6 is a schematic view of a battery device including the battery cell of the present application.

[0035] Figure 7 is a schematic view of a power consuming device including the battery device of the present application.

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] 10: insulating portion; 11: insulating portion body; 12, 12': protrusion; 20: connecting portion; 22: through hole; 30: body portion; 32: groove; 100, 200: electrode terminal; 300: housing; 311: end cap; 312: case; 400: electrode assembly; 421, 422: tab; 500: battery cell; 600: battery device; 601: battery module; 602: box; 6021: first box; 6022: second box; 700: motor; 800: controller; 1000: vehicle (power consuming device). DETAILED DESCRIPTION

[0038] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0039] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0041] In this paper, "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 various places 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.

[0042] 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 means that there are three cases of A alone, A and B together, and B alone.

[0043] In the description of the embodiments of the present application, the technical terms based on the indicated orientation or positional relationship shown in the drawings are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the indicated devices or elements must have a specific orientation, be configured and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0044] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] In the existing electrode terminal formed by injection molding, since the connecting portion has a through hole, stress concentration is easily generated at the interface between the insulating portion and the connecting portion, especially in the region near the through hole of the connecting portion, thereby causing plastic cracking failure. In particular, for small size terminals, if the terminal withstand voltage strength is lower than the valve opening pressure of the explosion-proof valve, thermal runaway of the battery can occur.

[0046] To solve the above problems, the application provides a battery monomer, a battery device comprising the battery monomer, and a power consumption device comprising the battery device. By locally strengthening the interface between the insulating portion and the connecting portion, the internal space of the battery monomer is not occupied, the terminal withstand voltage strength can be effectively strengthened, and plastic cracking failure caused by stress concentration can be avoided. Therefore, the service life of the battery monomer and the battery device comprising the battery monomer is greatly improved, the working time of the power consumption device is prolonged, and the cost is reduced. By improving the terminal withstand voltage strength, especially for small size terminals, the safety and reliability of the battery monomer can be improved.

[0047] In the present application, the battery monomer can include a lithium ion secondary battery monomer, a lithium ion primary battery monomer, a lithium-sulfur battery monomer, a sodium lithium ion battery monomer, a sodium ion battery monomer, or a magnesium ion battery monomer, etc. The present application embodiments are not limited thereto. The battery monomer can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The present application embodiments are also not limited thereto.

[0048] The battery device mentioned in the embodiments of the present application refers to a single physical module comprising one or more battery monomers to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module or a battery pack, etc. The battery generally includes a box for packaging one or more battery monomers. The box can prevent liquids or other foreign matters from affecting the charging or discharging of the battery monomers.

[0049] The technical solutions described in the embodiments of the present application are applicable to battery devices and power consumption devices using battery devices. The power consumption device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle 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 electric automobile, or an extended range electric automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above power consumption devices.

[0050] The following embodiments are for the convenience of illustration. First, an electrode terminal 100 according to an embodiment of the present application is described.

[0051] In the present embodiment, as shown in Figure 5 , the battery cell 500 includes the electrode terminal 100, which includes a body portion 30, a connecting portion 20, and an insulating portion 10 provided between the body portion 30 and the connecting portion 20, the body portion 30 being at least partially provided in the connecting portion 20, the connecting portion 20 having a through hole 22, and the insulating portion 10 including an insulating portion body 11 covering the connecting portion 20 and protrusions provided at the outer periphery of the insulating portion body 10 away from the body portion 30 and opposite to the through hole 22. Figures 1-3

[0052] More specifically, as shown in Figures 1-3 , the connecting portion 20 of the electrode terminal 100 according to the present application has four through holes 22 in the circumferential direction, and the insulating portion 10 is formed by injection molding via the through holes 22 in a state where the body portion 30 is inserted into the connecting portion 20, thereby forming the insulating portion 10 at the inner and outer peripheries of the connecting portion 20.

[0053] Here, for the convenience of illustration, Figure 1 is a schematic exploded perspective view of the electrode terminal according to an embodiment of the present application, but in fact, since the insulating portion 10 is formed by injection molding at the inner and outer peripheries of the connecting portion 20, i.e., the body portion 30, the connecting portion 20, and the insulating portion 10 are integrated, the three are not separable.

[0054] In the present embodiment, by injection molding, the insulating portion 10 has the insulating portion body 11 and four protrusions 12 (the four protrusions 12 are symmetric in pairs) protruding from the insulating portion body 11, and the protrusions 12 are provided opposite to the corresponding four through holes 22 (see Figure 2 and Figure 3 ). The protrusions 12 penetrate the through holes 22, i.e., the protrusions 12 are formed at both the outer periphery side and the inner periphery side of the insulating portion 10.

[0055] In Figure 1 and Figure 2 , the four protrusions 12 and the four through holes 22 are shown, here, the number of the through holes 22 can be one or more, and the positions are arbitrary in the circumferential direction, as long as injection molding via the through holes 22 can be ensured, but from the uniformity and efficiency of injection molding, the through holes can be a plurality of symmetric ones.

[0056] ​In addition, the number of protrusions 12 is at least one. By arranging protrusions on the outer periphery of the insulating portion body 11 away from the body portion 30 and opposite the through holes, the strength of the through holes of the connecting portion 20 can be locally strengthened, thereby avoiding plastic cracking failure due to stress concentration, thereby effectively improving the voltage strength and thrust strength of the terminal.

[0057] Here, the protrusions can be formed by grooving the inner cavity of a mold (not shown), and of course other methods can also be used.

[0058] Of course, the electrode terminal 100 of the present application can also include components other than the body portion 30, the connecting portion 20, and the insulating portion 10 as needed, for example, a seal can also be further provided from the perspective of sealing.

[0059] According to some embodiments of the present application, the protrusions 12 completely cover the corresponding through holes 22.

[0060] By making the protrusions 12 completely cover the corresponding through holes 22, stress concentration can be further avoided.

[0061] According to some embodiments of the present application, the number of protrusions is the same as the number of through holes 22. As Figure 1 shown, four protrusions 12 are formed corresponding to the four through holes 22 of the connecting portion 20, thereby avoiding stress concentration at each through hole.

[0062] According to some embodiments of the present application, the protrusions are formed along the entire periphery of the insulating portion body 11. Figure 4 is a schematic overall perspective view of an electrode terminal 200 disclosed by another embodiment of the present application. As Figure 4 shown, in the electrode terminal 200, protrusions 12' are formed along the entire periphery of the outer surface of the insulating portion body 11.

[0063] Thus, the strength of the insulating portion can be further strengthened, and since it is formed along the entire periphery, the forming mold and process are simpler.

[0064] According to some embodiments of the present application, the size of the protrusions 12 in the height direction is not higher than the upper surface of the insulating portion body 11.

[0065] Thus, the external space of the electrode terminal can be saved, and connection is facilitated when connecting in series, parallel, or mixed connection through the busbar.

[0066] According to some embodiments of the present application, the through holes 22 are symmetrically arranged in the circumferential direction of the connecting portion 20.

[0067] By arranging the through holes 22 symmetrically in the circumferential direction of the connecting portion 20, the injection molding operation of the insulating portion can be more efficient, and the stress is more uniform.

[0068] According to some embodiments of the present application, the body portion 30 has at least one groove 32 in the circumferential direction.

[0069] By providing the groove 32 on the outer circumferential side of the body portion 30, the flow path can be easily formed. Here, the groove 32 functions as a flow channel.

[0070] According to some embodiments of the present application, in the electrode terminal 100, the position of the groove 32 in the circumferential direction of the body portion 30 is opposite to the position of the at least one through hole 22 of the connecting portion 20.

[0071] By the position of the groove 32 in the circumferential direction of the body portion 30 being opposite to the position of the at least one through hole 22 of the connecting portion 20, the length of the flow path can be shortened.

[0072] According to some embodiments of the present application, the number of grooves 32 is the same as the number of through holes 22 of the connecting portion 20.

[0073] By making the number of grooves 32 the same as the number of through holes 22 of the connecting portion 20, the injection molding efficiency can be improved.

[0074] As shown in FIG. 1, the battery cell 500 includes a housing 300 and an electrode assembly 400. Figure 5

[0075] The housing 300 is used to accommodate the electrode assembly 400 and other components such as electrolyte. The housing 300 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. As an example, the housing 300 can include a shell body 312 and an end cap 311.

[0076] The shell body 312 can be a hollow structure with one end open, or a hollow structure with opposite ends open. The shell body 312 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0077] The electrode assembly 400 has tabs 421, 422 connected to the electrode terminal 100.

[0078] According to some embodiments of the present application, the battery cell 500 includes a housing 300, the electrode terminal 100 is disposed in the housing 300, the body portion 30 is at least partially disposed between the connecting portion 20 and the housing 300, and the connecting portion 20 is connected to the housing 300.

[0079] Figure 6 FIG. 1 is a structural schematic diagram of a battery device according to an embodiment of the present application.

[0080] In Figure 6 ​In this embodiment, the battery device 600 includes a battery module 601 and a housing 602. The battery module 601 is formed by arranging and fixing multiple battery cells into an independent module. As an example, the battery module 601 can be formed by bundling multiple battery cells together with cable ties. As an example, the battery cell assembly can be the battery module 601, which can be housed within the housing by fixing the battery module 601 to the housing. As an example, the battery cell assembly can also be housed within the housing 602 by directly fixing multiple battery cells 500 to the housing 602.

[0081] exist Figure 6 In the design, the housing 602 includes a first housing 6021 and a second housing 6022. The first housing 6021 and the second housing 6022 are fastened together to form a closed space inside the housing 602 to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 6021 can be a top cover or a bottom plate.

[0082] According to some embodiments of this application, this application provides a battery device 600, which includes a battery cell 500.

[0083] As described above, the lifespan of the battery device of this application is also improved due to the increased lifespan of the individual battery cells.

[0084] Please refer to Figure 7 , Figure 7 This is a schematic diagram of the structure of a vehicle (electrical device) provided in one embodiment of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 600 is installed inside the vehicle 1000, and the battery device 600 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 600 can be used to power the vehicle 1000; for example, the battery device 600 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 800 and a motor 700. The controller 800 is used to control the battery to supply power to the motor 700, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0085] The battery device 600 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0086] According to some embodiments of this application, this application provides an electrical device 1000, which includes a battery device 600.

[0087] By increasing the lifespan of the battery unit, the operating time of electrical devices that include the battery unit is extended, thereby reducing costs.

[0088] like Figures 1-3 As shown in Figure 5, the battery cell 500 includes an electrode terminal 100. The electrode terminal 100 includes a body portion 30, a connecting portion 20, and an insulating portion 10 disposed between the body portion 30 and the connecting portion 20. The body portion 30 is at least partially disposed within the connecting portion 20. The connecting portion 20 has a through hole 22. The insulating portion 10 includes an insulating body 11 covering the connecting portion 20 and a protrusion disposed on the outer periphery of the insulating body 10 away from the body portion 300 and opposite to the through hole 22. Further, the protrusion 12 completely covers the corresponding through hole 22. The number of protrusions is the same as the number of through holes 22. The height dimension of the protrusion 12 is not higher than the upper surface of the insulating body 11. The through holes 22 are symmetrically arranged in the circumferential direction of the connecting portion. In addition, the body portion 30 has at least one groove 32 in the circumferential direction. The position of the groove 32 in the circumferential direction of the body portion 30 is opposite to the position of at least one through hole 22 of the connecting portion 20. The number of grooves 32 is the same as the number of through holes 22 of the connecting portion 20.

[0089] According to the above preferred embodiment, the strength of the area near the through hole of the connection in the insulation part can be locally strengthened, thereby avoiding stress concentration in the area and shortening the length of the injection flow path, thus improving injection efficiency.

[0090] It should be noted that there are no restrictions on the shape of the protrusion in this application, as long as it can provide local reinforcement to the through hole. However, from the perspective of mold structure, the protrusion can have a simple shape. In addition, there are no special requirements for the materials of the body part 30, the connecting part 20 and the insulating part 10. PPS is generally used for the plastic coating, Al is generally used for the connecting part, and Al or Cu is generally used for the terminals depending on whether they are positive or negative.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments applied herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by comprising: an electrode terminal, the electrode terminal includes a body portion, a connecting portion, and an insulating portion provided between the body portion and the connecting portion, the body portion is at least partially provided within the connecting portion, the connecting portion has a through-hole, the insulating portion includes: an insulating portion body that covers the connecting portion; and a protrusion provided at an outer periphery of the insulating portion body away from the body portion and disposed opposite the through-hole.

2. The battery cell according to claim 1, characterized in that: the protrusion completely covers the corresponding through-hole.

3. The battery cell according to claim 2, characterized in that: the number of protrusions is the same as the number of through-holes.

4. The battery cell according to claim 3, characterized in that: the protrusions are formed around the entire periphery of the insulating portion body.

5. The battery cell according to any one of claims 1 to 4, characterized in that: a dimension of the protrusion in a height direction is not higher than an upper surface of the insulating portion body.

6. The battery cell according to any one of claims 1 to 4, characterized in that: the through-holes are symmetrically disposed in a circumferential direction of the connecting portion.

7. The battery cell according to any one of claims 1 to 4, characterized in that: the body portion has at least one groove in a circumferential direction.

8. The battery cell according to claim 7, characterized in that: a position of the groove in the circumferential direction of the body portion is opposite a position of at least one of the through-holes of the connecting portion.

9. The battery cell according to claim 8, characterized in that: the number of grooves is the same as the number of through-holes of the connecting portion.

10. The battery cell according to any one of claims 1 to 4, characterized in that the battery cell includes a housing, the electrode terminal is provided to the housing, the body portion is at least partially provided between the connecting portion and the housing, the connecting portion is connected to the housing.

11. A battery device, characterized by: the battery device includes the battery cell according to any one of claims 1 to 10.

12. An electric device, characterized by: the electric device includes the battery device according to claim 11.

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