Battery and electric device

Abstract

The utility model provides a battery and a power utilization device, and relates to the technical field of batteries. The battery comprises a shell, a cap, a roll core and a collector plate, a containing cavity is formed in the shell, the roll core and the collector plate are both arranged in the containing cavity, and the cap is connected with the shell to seal the containing cavity; the flow collecting disc is connected with the roll core and the inner bottom wall of the shell at the same time, a buffering part is arranged on the surface, facing the inner bottom wall of the shell, of the flow collecting disc in a protruding mode, and the buffering part abuts against the inner bottom wall of the shell; the current collecting plate meets the condition that H1 / H is more than 0.4 and less than or equal to 0.8, H1 is the height of the buffer part, H is the height of the current collecting plate, the probability that the battery passes a drop test is improved, and the safety is further ensured.

Description

TECHNICAL FIELD

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

[0002] With the continuous progress of technology, cylindrical batteries are particularly prominent in the field of electric vehicles. Through continuous technological innovation, such as the design of no tab and CTC structure, the performance and safety of batteries have been further improved. In addition, cylindrical batteries also show their unique advantages in the energy storage market, such as high safety and high rate performance, which makes them widely used in the energy storage field.

[0003] Cylindrical batteries are usually composed of a shell, a winding core, a current collector plate, and a cap, etc. The internal space of the shell is used to accommodate the winding core and the current collector plate, while the cap is responsible for closing the shell to ensure the stability of the internal environment of the battery. The winding core, as the core part of the battery, is responsible for storing electrical energy and is the key to the performance of the battery. In the process of drop test, the bottom of the existing cylindrical battery hits the test platform, and in this process, the drop test may not pass. When such a battery is applied to a power utilization device such as a car, it is difficult to ensure safety. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application includes, for example, providing a battery that improves the probability of passing the drop test and thus ensures safety.

[0005] The purpose of the present application also includes providing a power utilization device in which the battery improves the probability of passing the drop test and thus ensures safety.

[0006] Embodiments of the present application can be implemented as follows:

[0007] In a first aspect, embodiments of the present application provide a battery, which includes a shell, a cap, a winding core, and a current collector plate. The shell has an accommodation cavity. The winding core and the current collector plate are both arranged in the accommodation cavity. The cap is connected with the shell to close the accommodation cavity. The current collector plate is connected with the winding core and the inner bottom wall of the shell. The surface of the current collector plate facing the inner bottom wall of the shell is provided with a buffer portion. The buffer portion abuts against the inner bottom wall of the shell.

[0008] The current collector plate satisfies 0.4 < H1 / H ≤ 0.8, where H1 is the height of the buffer portion, and H is the height of the current collector plate. The height direction of the buffer portion is consistent with the height direction of the current collector plate.

[0009] Optionally, the number of buffer portions is multiple. The multiple buffer portions are uniformly and spacedly arranged along the circumference of the current collector plate.

[0010] Optionally, any two adjacent buffer portions on the current collecting disc are welding areas, and the current collecting disc is welded to the winding core at the welding areas.

[0011] Optionally, in a cross section parallel to the surface of the current collecting disc facing the winding core, the cross section of the buffer portion is trapezoidal, and the short side of the trapezoidal cross section of the buffer portion is closer to the center of the current collecting disc than the long side.

[0012] Optionally, the length of the short side of the trapezoidal cross section of the buffer portion is 2±0.1 mm, the length of the long side of the trapezoidal cross section of the buffer portion is 3±0.1 mm, and the height of the buffer portion is 4.5±0.1 mm.

[0013] Optionally, the battery further comprises a current collecting tab, the current collecting tab is arranged in the accommodating cavity, and the current collecting tab is connected to the cap and the winding core.

[0014] Optionally, the surface center of the current collecting disc facing the inner bottom wall of the shell is provided with a connecting portion, and the connecting portion is welded to the inner bottom wall of the shell.

[0015] Optionally, in a cross section parallel to the surface of the current collecting disc facing the winding core, the cross section of the connecting portion is circular, and the diameter of the connecting portion is 5.5-6.5 mm.

[0016] Optionally, the current collecting disc satisfies 0.4<H2 / H≤0.8, where H2 is the height of the connecting portion, and H is the height of the current collecting disc, and the height direction of the buffer portion is consistent with the height direction of the current collecting disc.

[0017] In a second aspect, the application also provides a power consuming device comprising the battery.

[0018] The battery and the power consuming device provided by the embodiments of the application have the following beneficial effects, for example: in order to improve the probability of passing the drop test, a battery is designed, the battery comprises a shell, a cap, a winding core and a current collecting disc, the shell is provided with an accommodating cavity, the winding core and the current collecting disc are arranged in the accommodating cavity, the cap is connected to the shell to close the accommodating cavity, the current collecting disc is connected to the winding core and the inner bottom wall of the shell, the surface of the current collecting disc facing the inner bottom wall of the shell is provided with a buffer portion, the buffer portion abuts against the inner bottom wall of the shell, the buffer portion can effectively buffer when the battery is subjected to the drop test, thereby ensuring the safety of the battery, and when the current collecting disc satisfies 0.4<H1 / H≤0.8, the buffer portion can effectively buffer, and the buffer portion does not affect the internal space of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0020] Fig. 1 The exploded view of the battery in the embodiments of the present application;

[0021] Fig. 2 The schematic diagram of the first perspective view of the current collecting disc in the embodiments of the present application;

[0022] Fig. 3 The schematic diagram of the second perspective view of the current collecting disc in the embodiments of the present application.

[0023] Figure: 100 - shell; 200 - roll core; 300 - current collecting disc; 310 - buffer part; 320 - welding area; 330 - connecting part; 400 - current collecting sheet; 500 - insulating gasket. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0026] It should be noted that: similar numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0027] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the utility model product is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it should not be understood as a limitation of the present application.

[0028] In addition, if the terms "first", "second" and the like are used herein, they are merely used to distinguish one entity from another, and do not imply or suggest relative importance.

[0029] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0030] As disclosed in the background section, in the process of the existing cylindrical battery in the drop test, the bottom of the battery hits the test platform, and in this process, due to the absence of a buffer structure at the bottom of the battery, the drop test may fail, and it is difficult to ensure safety when such a battery is applied to an electric device such as a car. The embodiments of the present application provide a battery at least to solve the technical problem.

[0031] Please refer to Figs. 1-3 The battery provided by the embodiments of the present application includes a shell 100, a cap (not shown in the figure), a winding core 200, and a current collecting disc 300. The shell 100 is provided with an accommodating cavity, and the winding core 200 and the current collecting disc 300 are arranged in the accommodating cavity. The cap is connected with the shell 100 to close the accommodating cavity. The current collecting disc 300 is connected with the winding core 200 and the inner bottom wall of the shell 100. The surface of the current collecting disc 300 facing the inner bottom wall of the shell 100 is provided with a buffer portion 310, and the buffer portion 310 abuts against the inner bottom wall of the shell 100.

[0032] The shell 100 is a cylindrical single-pass shell with one end open. The shell 100 can be made of aluminum or stainless steel. The outer part of the shell 100 is provided with a heat-shrinkable insulating film. The cap is connected to the end of the shell 100 where the opening is provided to close the accommodating cavity. The battery further includes a current collecting tab 400 arranged in the accommodating cavity. The current collecting tab 400 is located between the cap and the winding core 200, and the current collecting disc 300 is located between the winding core 200 and the inner bottom wall of the shell 100.

[0033] It should be noted that the winding core 200 is formed by winding a positive electrode tab, a separator, and a negative electrode tab. The winding core 200 is provided with a positive electrode tab and a negative electrode tab. The positive electrode tab and the negative electrode tab of the winding core 200 are obtained by flattening the reserved foil area during coating. The positive electrode tab of the winding core 200 is close to the current collecting tab 400. The positive electrode tab of the winding core 200 is connected with the current collecting tab 400 in a laser welding manner. The negative electrode tab of the winding core 200 is close to the current collecting disc 300. The negative electrode tab of the winding core 200 is connected with the current collecting disc 300 in a laser welding manner.

[0034] The current collector tab 400 can be an irregular-shaped metal sheet, generally circular, and is provided with an aluminum rectangular tab handle. An insulating gasket 500 is provided between the current collector tab 400 and the cap, and the tab handle is welded to the cap through the insulating gasket 500. The body of the current collector tab 400 is welded to the flat surface of the positive tab of the winding core 200.

[0035] In the process of preparing the battery, after the winding core 200 is wound, the positive and negative tab foils are flattened to obtain positive and negative tabs. Then, the positive current collector tab 400 is connected to the flat surface of the positive tab by laser welding, and the negative current collector disc 300 is connected to the flat surface of the negative tab. Finally, the shell 100 and the cap are assembled to form the battery.

[0036] The battery in this embodiment is a sodium ion battery. In other embodiments, the battery can also be a lithium ion battery, and the like, without limitation.

[0037] The buffer portion 310 is protruded on the surface of the current collector disc 300 facing the inner bottom wall of the shell 100, and abuts against the inner bottom wall of the shell 100. During the drop test of the battery, the bottom of the battery hits the test platform. The buffer portion 310 can absorb part of the impact by deforming itself, effectively buffer, effectively avoid the large displacement or impact of the winding core 200 in the shell 100, causing the electrical connection of the battery to be disconnected, the battery to be invalid, and the winding core 200 in the shell 100 to be protected, thereby ensuring the safety of the battery.

[0038] In this embodiment, the number of buffer portions 310 is multiple, and the multiple buffer portions 310 are uniformly and spacedly arranged along the circumference of the current collector disc 300.

[0039] By uniformly and spacedly arranging multiple buffer portions 310 along the circumference of the current collector disc 300, the multiple buffer portions 310 can all play a buffering role, further improving the pass rate of the battery in the drop test.

[0040] Exemplarily, the number of buffer portions 310 is six or eight. Of course, it can be understood that the number of buffer portions 310 can be determined according to actual needs, as long as it can play an effective buffering effect.

[0041] In this embodiment, the welding area 320 is arranged between any two adjacent buffer portions 310 on the current collector disc 300, and the current collector disc 300 is welded to the winding core 200 at the multiple welding areas 320.

[0042] The welding track of the welding area 320 can be a radial straight line, an extension line of which passes through the center of the current collector plate 300. When laser welding is performed according to the welding track on the current collector plate 300 and the negative tab of the core 200, the welding stability can be ensured.

[0043] In this embodiment, the cross-sectional shape of the buffer portion 310 is trapezoidal, and the short side of the trapezoidal cross section of the buffer portion 310 is closer to the center of the current collector plate 300 than the long side.

[0044] The median line of the short side or the long side of the trapezoidal cross section of the buffer portion 310 passes through the center of the current collector plate 300. In other embodiments, the cross-sectional shape of the buffer portion 310 can also be rectangular or circular, which is not limited.

[0045] Further, the length of the short side of the trapezoidal cross section of the buffer portion 310 is 2±0.1 mm, the length of the long side of the trapezoidal cross section of the buffer portion 310 is 3±0.1 mm, and the height of the buffer portion 310 is 4.5±0.1 mm.

[0046] For example, the length of the short side of the trapezoidal cross section of the buffer portion 310 is 1.9 mm, 2.0 mm or 2.1 mm, the length of the long side of the trapezoidal cross section of the buffer portion 310 is 2.9 mm, 3.0 mm or 3.1 mm, and the height of the buffer portion 310 is 4.4 mm, 4.5 mm or 4.6 mm.

[0047] In this embodiment, the current collector plate 300 satisfies 0.4

[0048] On the one hand, by limiting H1 / H>0.4, the buffer portion 310 can play a good buffering role. If the height H1 of the buffer portion 310 is too small, it cannot play a good buffering role. On the other hand, by limiting H1 / H≤0.8, the buffer portion 310 basically does not affect the internal space of the battery in the height direction of the battery, thereby reducing the influence on the energy density of the battery.

[0049] For example, the current collector plate 300 satisfies H1 / H=0.5, or H1 / H=0.6, or H1 / H=0.7, or H1 / H=0.8. The ratio of the height H1 of the buffer portion 310 to the height H of the current collector plate 300 can be determined according to actual production needs.

[0050] In this embodiment, the current collector plate 300 is provided with a connecting portion 330 at the surface center of the inner bottom wall of the shell 100, and the connecting portion 330 is welded to the inner bottom wall of the shell 100.

[0051] It should be noted that the plurality of buffering portions 310 are arranged around the connecting portion 330, and the connecting portion 330 and the buffering portion 310 can be formed by stamping process, that is, on the surface of the current collector plate 300 facing the inner bottom wall of the shell 100, the connecting portion 330 and the buffering portion 310 are in a convex shape, and on the surface of the current collector plate 300 facing the winding core 200, the connecting portion 330 and the buffering portion 310 are in a concave shape.

[0052] In other embodiments, the connecting portion 330 and the buffering portion 310 can also be formed on the surface of the current collector plate 300 facing the inner bottom wall of the shell 100 by additive process, and at this time, the surface of the current collector plate 300 facing the winding core 200 has no concave area.

[0053] In the cross section parallel to the surface of the current collector plate 300 facing the winding core 200, the cross-sectional shape of the connecting portion 330 is circular, and the diameter of the connecting portion 330 is 5.5-6.5mm.

[0054] Exemplarily, the diameter of the connecting portion 330 is 5.5mm, 6.0mm or 6.5mm, and of course, it can be understood that in the cross section parallel to the surface of the current collector plate 300 facing the winding core 200, the cross-sectional shape of the connecting portion 330 can also be rectangular or other polygonal shape, which is not limited.

[0055] In the embodiment, the current collector plate 300 satisfies: 0.4

[0056] Exemplarily, the current collector plate 300 satisfies: H2 / H=0.5, or H2 / H=0.6, or H2 / H=0.7, or H2 / H=0.8, and the ratio of the height H2 of the connecting portion 330 to the height H of the current collector plate 300 can be determined according to actual production needs.

[0057] The beneficial effects of the battery of the present application are illustrated by the examples and comparative examples:

[0058] Example one: the battery made by using the current collector plate 300 in the embodiment of the present application, wherein the height H of the current collector plate 300 is 0.25mm, the height H1 of the buffering portion 310 is 0.15mm, the height H2 of the connecting portion 330 is 0.15mm, H1 / H=0.6, and H2 / H=0.6.

[0059] Example Two: A battery is made by using the current collector plate 300 in the embodiments of the present application, wherein the height H of the current collector plate 300 is 0.25 mm, the height H1 of the buffer portion 310 is 0.2 mm, the height H2 of the connecting portion 330 is 0.2 mm, H1 / H=0.8, and H2 / H=0.8.

[0060] Comparative Example: The main difference between the comparative example and the examples one and two is that the buffer portion 310 is not provided on the current collector plate 300.

[0061] The batteries made in the examples one, two and the comparative example are respectively subjected to drop tests, wherein the number of the batteries made in the examples one, two and the comparative example is 20, and the test results are as follows:

[0062] During the 1-meter drop test, 20 batteries made in the example one pass, 20 batteries made in the example two pass, and 19 batteries made in the comparative example pass.

[0063] During the 1.5-meter drop test, 20 batteries made in the example one pass, 20 batteries made in the example two pass, and 17 batteries made in the comparative example pass.

[0064] During the 2-meter drop test, 19 batteries made in the example one pass, 20 batteries made in the example two pass, and 14 batteries made in the comparative example pass.

[0065] It can be seen that in the drop test, the test pass rate of the batteries made in the examples one and two is higher than that of the batteries made in the comparative example, and the current collector plate 300 provided with the buffer portion 310 has obvious protective effect on the batteries; and by comparing the example one with the example two, the greater the ratio of the height H1 of the buffer portion 310 to the height H of the current collector plate 300, the higher the height of the buffer portion 310 relative to the current collector plate 300, and the higher buffer portion 310 can have better buffering effect when the battery is subjected to the drop test.

[0066] The embodiments of the present application also provide a power consumption device including the above battery. For example, the power consumption device can be a vehicle, a ship, a spacecraft, etc. The vehicle can be a fuel automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid electric vehicle, or a range extended vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, etc. The embodiments of the present application do not specially limit the above power consumption device.

[0067] In summary, the embodiments of the present application provide a battery and an electric device. The plurality of buffer portions 310 are uniformly and evenly spaced around the center of the current collecting disc 300 on the surface of the current collecting disc 300 facing the inner bottom wall of the shell 100. When the battery is subjected to a drop test, the plurality of buffer portions 310 can effectively buffer, effectively avoid the large displacement or impact of the roll core 200 in the shell 100, cause the electrical connection of the battery to be disconnected, and the battery to be invalid, and protect the roll core 200 in the shell 100, thereby ensuring the safety of the battery.

[0068] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery, characterized by, The battery comprises a shell, a cap, a roll core and a current collecting plate, the shell is internally provided with a containing cavity, the roll core and the current collecting plate are arranged in the containing cavity, the cap is connected with the shell to seal the containing cavity, the current collecting plate is connected with the roll core and the inner bottom wall of the shell, the surface of the current collecting plate facing the inner bottom wall of the shell is provided with a buffer portion, and the buffer portion abuts against the inner bottom wall of the shell. The current collecting plate satisfies 0.4 2. The battery of claim 1, wherein, The surface center of the current collecting plate facing the inner bottom wall of the shell is provided with a connecting portion, and the connecting portion is welded with the inner bottom wall of the shell.

3. The battery of claim 2, wherein, In the cross section parallel to the surface of the current collecting plate facing the roll core, the cross section shape of the connecting portion is circular, and the diameter of the connecting portion is 5.5-6.5 mm.

4. The battery of claim 2, wherein, The current collecting plate satisfies 0.4 5. The battery of claim 1, wherein, The number of the buffer portions is multiple, and the multiple buffer portions are uniformly and spacedly arranged along the circumference of the current collecting plate.

6. The battery of claim 5, wherein, Between any two adjacent buffer portions on the current collecting plate, there is a welding area, and the current collecting plate is welded with the roll core at the multiple welding areas.

7. The battery of claim 1, wherein, In the cross section parallel to the surface of the current collecting plate facing the roll core, the cross section shape of the buffer portion is trapezoidal, and the short side of the trapezoidal cross section of the buffer portion is closer to the center of the current collecting plate than the long side.

8. The battery of claim 7, wherein, The length of the short side of the trapezoidal cross section of the buffer portion is 2±0.1 mm, the length of the long side of the trapezoidal cross section of the buffer portion is 3±0.1 mm, and the height of the buffer portion is 4.5±0.1 mm.

9. The battery of claim 1, wherein, The battery further comprises a current collecting tab, the current collecting tab is arranged in the containing cavity, and the current collecting tab is connected with the cap and the roll core.

10. An electrical device, characterized by The battery comprises the battery according to any one of claims 1-9.

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