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, the cap is connected with the shell to seal the containing cavity, the collector plate is connected with the roll core and the inner bottom wall of the shell at the same time, and the thickness of the collector plate is 0.1-0.5 mm. According to the battery, the good internal resistance can be guaranteed, and meanwhile the structural strength is guaranteed.

Description

TECHNICAL FIELD

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

[0002] The battery is an indispensable energy storage device in modern technology, and its performance directly affects the user experience and product reliability of many electronic devices. The battery internal resistance plays a key role in its overall performance. Poor internal resistance not only leads to reduced discharge capacity and charging efficiency in terms of performance, but also causes serious battery heating and safety problems.

[0003] The cylindrical battery gradually becomes a mainstream product in the new energy industry due to its high energy density, good capacity consistency, and support for large-rate charging and discharging. The current collector plate in the cylindrical battery has a certain influence on the internal resistance of the battery. The greater the thickness of the current collector plate, the greater the resistance, and the greater the internal resistance of the battery. In order to reduce the internal resistance of the battery, the thickness of the current collector plate can be reduced. However, if the thickness of the current collector plate is too small, it will reduce the strength of the current collector plate, thereby affecting the structural strength of the battery. UTILITY MODEL CONTENT

[0004] The purpose of the present application includes, for example, providing a battery that can ensure better internal resistance while ensuring structural strength.

[0005] The purpose of the present application also includes providing a power consumption device that can ensure better internal resistance of the battery while ensuring structural strength.

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

[0007] An embodiment of the present application provides a battery, which includes a shell, a cap, a roll core, and a current collector plate. The shell is provided with a receiving cavity. The roll core and the current collector plate are arranged in the receiving cavity. The cap is connected with the shell to close the receiving cavity. The current collector plate is connected with the roll core and the inner bottom wall of the shell. The thickness of the current collector plate is 0.1-0.5mm.

[0008] Optionally, the thickness of the current collector plate is 0.2-0.4mm.

[0009] Optionally, a plurality of through holes are uniformly and circumferentially arranged on the current collector plate. In a cross section parallel to the surface of the current collector plate facing the roll core, the cross section of each through hole includes a first circular arc, a second circular arc, and two third circular arcs. The centers of the first circular arc and the second circular arc are both the center of the current collector plate. Each third circular arc connects the two ends of the first circular arc and the second circular arc on the same side. The diameter of the first circular arc is smaller than the diameter of the second circular arc.

[0010] Optionally, the current collector plate satisfies:

[0011] D1=7.5*D4 / 32, D2=12.5*D4 / 32, D3=5*D4 / 32, wherein D1 is the diameter of the first circular arc, D2 is the diameter of the second circular arc, D3 is the diameter of the third circular arc, and D4 is the diameter of the winding core.

[0012] Optionally, a plurality of first bosses are uniformly spaced along the circumference of the current collecting disc towards the surface of the winding core, and each of the plurality of first bosses is welded with the tab of the winding core.

[0013] Optionally, the first boss is a rectangular boss, and the current collecting disc satisfies:

[0014] L=9.5*D4 / 32, W=3.5*D4 / 32, H=0.005*D4, D5=4.5*D4 / 32, wherein L is the length of the first boss, W is the width of the first boss, H is the height of the first boss, D4 is the diameter of the winding core, and D5 is the distance between the first boss and the center of the current collecting disc.

[0015] Optionally, a second boss is arranged at the center of the surface of the current collecting disc away from the winding core, the second boss is welded with the inner bottom wall of the shell, and the height of the second boss is 0.15-0.3 mm.

[0016] Optionally, the second boss is a circular boss, and the diameter of the second boss is 6.0-6.4 mm.

[0017] Optionally, the current collecting disc satisfies D0=30*D4 / 32, wherein D0 is the diameter of the current collecting disc, and D4 is the diameter of the winding core.

[0018] Optionally, the current collecting disc is made of O-state pure aluminum material.

[0019] The application also provides a power consumption device comprising the battery.

[0020] The battery and the power consumption device provided by the application have the following advantages, for example: in order to ensure that the battery has a better internal resistance and at the same time ensure the structural strength of the battery, the application designs a battery, which comprises a shell, a cap, a winding core and a current collecting disc, the shell is internally provided with an accommodating cavity, the winding core and the current collecting disc are arranged in the accommodating cavity, the cap is connected with the shell to close the accommodating cavity, the current collecting disc is connected with the winding core and the inner bottom wall of the shell at the same time, and the thickness of the current collecting disc is 0.1-0.5 mm. In the case that the thickness of the current collecting disc is 0.1-0.5 mm, the thickness of the current collecting disc is in a relatively reasonable range, at this time, the internal resistance of the battery is smaller, and the strength of the current collecting disc is better, thereby ensuring that the battery has a better internal resistance and at the same time ensuring the structural strength of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 is a partial exploded structural view of a battery in the embodiments of the present application;

[0023] Figure 2 is a schematic view for showing the size of a current collecting plate in the embodiments of the present application;

[0024] Figure 3 is a schematic view of a first current collecting plate in the embodiments of the present application;

[0025] Figure 4 is a schematic view of a second current collecting plate in the embodiments of the present application;

[0026] Figure 5 is a schematic view of a third current collecting plate in the embodiments of the present application.

[0027] Figure: 100 - shell; 200 - roll core; 300 - current collecting plate; 310 - through hole; 311 - first circular arc; 312 - second circular arc; 313 - third circular arc; 320 - first boss; 330 - second boss. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings 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 herein can be arranged and designed in various different configurations.

[0029] 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 protection of the present application.

[0030] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] 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 shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] In addition, if the terms "first", "second" and the like are used only to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0034] As disclosed in the background art, the current collector plate in the cylindrical battery has a certain influence on the internal resistance of the battery, the greater the thickness of the current collector plate, the greater the resistance, and in turn the greater the internal resistance of the battery, the influence of the high internal resistance of the battery at least includes: 1, short service life: high internal resistance of the battery will cause current flow to be limited, generate heat, and low energy conversion efficiency, thereby shortening the service life of the battery; 2, capacity decline: high internal resistance of the battery will cause the battery operating voltage to drop, so that the battery cannot provide the original capacity, thereby reducing the battery capacity efficiency; 3, large heat generation: high internal resistance will cause more heat to be generated during the charging and discharging process inside the battery, causing the battery to thermally expand, and in severe cases, thermal runaway, i.e. reduced battery safety performance.

[0035] In order to reduce the internal resistance of the battery, the thickness of the current collector plate can be reduced, but if the thickness of the current collector plate is too small, it will reduce the strength of the current collector plate, and in turn affect the structural strength of the battery, the embodiments of the present application provide a battery, at least to solve the technical problem.

[0036] Please refer to Figures 1-3 The battery provided by the embodiments of the present application includes a shell 100, a cap, a roll core 200 and a current collector plate 300, the shell 100 is provided with an accommodation cavity, the roll core 200 and the current collector plate 300 are arranged in the accommodation cavity, the cap is connected with the shell 100 to close the accommodation cavity, the current collector plate 300 is connected with the roll core 200 and the inner bottom wall of the shell 100 at the same time, and the thickness of the current collector plate 300 is 0.1-0.5mm.

[0037] The current collector plate 300 is located between the roll core 200 and the inner bottom wall of the shell 100, and is connected with the roll core 200 and the inner bottom wall of the shell 100 at the same time, the thickness of the current collector plate 300 can be selected as 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm, it can be understood that as long as the thickness of the current collector plate 300 is within the range of 0.1-0.5mm, it is not limited.

[0038] In the case that the thickness of the current collecting plate 300 is 0.1-0.5mm, the thickness of the current collecting plate 300 is in a reasonable range, at this time, the internal resistance of the battery is smaller, and the strength of the current collecting plate 300 is better, thereby ensuring that the battery has a better internal resistance while ensuring the structural strength of the battery.

[0039] Thickness of current collector (mm) 0.1 0.2 0.3 0.4 0.5 0.6 0.8 Internal resistance (mΩ) 1.45 1.35 1.2 1.4 1.5 1.7 1.9

[0040] From the above data, it can be concluded that when the thickness of the current collecting plate 300 exceeds 0.5mm, the internal resistance of the battery increases more obviously, which is difficult to accept in the market, so the thickness of the current collecting plate 300 is set to 0.1-0.5mm, which is more reasonable.

[0041] In a preferred embodiment, the thickness of the current collecting plate 300 is 0.2-0.4mm, and the strength of the current collecting plate 300 in this thickness range is better, and the internal resistance of the battery can be basically limited to within 1.4mΩ.

[0042] It should be pointed out that the thickness of the current collecting plate 300 is related to the diameter of the winding core 200, if the diameter of the winding core 200 changes, the thickness of the current collecting plate 300 needs to be adjusted accordingly with the diameter of the winding core 200, in the present embodiment, the thickness of the new current collecting plate 300 = the thickness of the original current collecting plate 300 * the diameter of the new winding core 200 / 32, for example, the thickness of the original current collecting plate 300 is 0.1mm, and the diameter of the new winding core 200 is 64mm, then the thickness of the new current collecting plate 300 is 0.2mm.

[0043] In the present embodiment, a plurality of through holes 310 are uniformly and circumferentially arranged on the current collecting plate 300, and on the cross section parallel to the surface of the current collecting plate 300 facing the winding core 200, the cross section of each through hole 310 includes a first circular arc 311, a second circular arc 312 and two third circular arcs 313, the centers of the first circular arc 311 and the second circular arc 312 are both the center of the current collecting plate 300, each third circular arc 313 connects the two ends of the first circular arc 311 and the second circular arc 312 on the same side, and the diameter of the first circular arc 311 is smaller than that of the second circular arc 312.

[0044] On the cross section of each through hole 310, the first circular arc 311, one of the third circular arcs 313, the second circular arc 312 and the other third circular arc 313 are connected in sequence, the two third circular arcs 313 are connected with the two ends of the first circular arc 311 respectively, and the two third circular arcs 313 are connected with the two ends of the second circular arc 312 respectively, and the first circular arc 311 is closer to the center of the current collecting plate 300 than the second circular arc 312.

[0045] By uniformly and circumferentially arranging a plurality of through holes 310 on the current collecting plate 300, the current collecting plate 300 can be welded and positioned, and the absorption of electrolyte can be accelerated.

[0046] Exemplarily, if the number of the through holes 310 is three, the adjacent two through holes 310 are arranged at an included angle of 120°.

[0047] In this embodiment, the current collector plate 300 satisfies: D1=7.5*D4 / 32, D2=12.5*D4 / 32, and D3=5*D4 / 32, wherein D1 is the diameter of the first circular arc 311, D2 is the diameter of the second circular arc 312, D3 is the diameter of the third circular arc 313, and D4 is the diameter of the winding core 200.

[0048] It should be noted that the diameter D1 of the first circular arc 311, the diameter D2 of the second circular arc 312, and the diameter D3 of the third circular arc 313 are all related to the diameter D4 of the winding core 200, and when the diameter D4 of the winding core 200 changes, the diameter D1 of the first circular arc 311, the diameter D2 of the second circular arc 312, and the diameter D3 of the third circular arc 313 are adjusted accordingly.

[0049] Exemplarily, when the diameter D4 of the winding core 200 is 32 mm, the diameter D1 of the first circular arc 311 is 7.5 mm, the diameter D2 of the second circular arc 312 is 12.5 mm, and the diameter D3 of the third circular arc 313 is 5 mm.

[0050] In this embodiment, the surface of the current collector plate 300 facing the winding core 200 is uniformly spaced in the circumferential direction of the current collector plate 300 and is provided with a plurality of first bosses 320, and the plurality of first bosses 320 are all welded with the tab of the winding core 200.

[0051] The number of the first bosses 320 is consistent with the number of the through holes 310, and the first bosses 320 and the through holes 310 are alternately arranged in the circumferential direction of the current collector plate 300; the current collector plate 300 provided with the first bosses 320 is a negative current collector plate 300, the end surface of the winding core 200 facing the current collector plate 300 is provided with a negative tab, and the plurality of first bosses 320 are all connected to the negative tab in the form of laser welding, and the welding line of laser welding can be in the form of dots or a continuous line, and the continuous line can be in the form of a straight line, a wavy line, or a broken line.

[0052] Exemplarily, the number of the first bosses 320 is three, the adjacent two first bosses 320 are arranged at an included angle of 120°, the number of the through holes 310 is also three, and the three first bosses 320 and the three through holes 310 are alternately arranged in the circumferential direction of the current collector plate 300, and the included angle between any first boss 320 and the adjacent through hole 310 is 60°.

[0053] The height H of the first boss 320 is 0.1-0.3 mm, which can effectively increase the contact area between the current collector plate 300 and the negative tab of the roll core 200, increase the contact compaction degree between the current collector plate 300 and the roll core 200, increase the conductive effect, reduce the internal resistance, reduce the heat generation, and be beneficial to large-rate charging and discharging of the battery.

[0054] In this embodiment, the first boss 320 is a rectangular boss, and the current collector plate 300 satisfies: L=9.5*D4 / 32, W=3.5*D4 / 32, H=0.005*D4, D5=4.5*D4 / 32, wherein L is the length of the first boss 320, W is the width of the first boss 320, H is the height of the first boss 320, D4 is the diameter of the roll core 200, and D5 is the distance between the first boss 320 and the center of the current collector plate 300.

[0055] It should be noted that the length L of the first boss 320, the width W of the first boss 320, the height H of the first boss 320, and the distance D5 between the first boss 320 and the center of the current collector plate 300 are all related to the diameter D4 of the roll core 200, wherein the distance D5 between the first boss 320 and the center of the current collector plate 300 is the distance between the edge of the first boss 320 close to the center of the current collector plate 300 and the center of the current collector plate 300.

[0056] When the diameter D4 of the roll core 200 changes, the length L of the first boss 320, the width W of the first boss 320, the height H of the first boss 320, and the distance D5 between the first boss 320 and the center of the current collector plate 300 are adjusted accordingly with the diameter D4 of the roll core 200.

[0057] For example, when the diameter D4 of the roll core 200 is 32 mm, the length L of the first boss 320 is 9.5 mm, the width W of the first boss 320 is 3.5 mm, the height H of the first boss 320 is 0.16 mm, and the distance D5 between the first boss 320 and the center of the current collector plate 300 is 4.5 mm.

[0058] In other embodiments, the first boss 320 can also be a trapezoidal boss or other polygonal boss, as long as it is convenient for welding with the negative tab of the roll core 200.

[0059] In this embodiment, the surface center of the current collector plate 300 away from the roll core 200 is provided with a second boss 330, the second boss 330 is welded with the inner bottom wall of the shell 100, and the height of the second boss 330 is 0.15-0.3 mm, for example, the height of the second boss 330 can be selected as 0.15 mm, 0.2 mm, 0.25 mm or 0.3 mm.

[0060] The second boss 330 is located at the center of the surface of the current collector plate 300 away from the roll core 200, and is connected to the inner bottom wall of the shell 100 by ultrasonic welding. The ultrasonic welding process can ensure that the current collector plate 300 and the shell 100 are fully fused to ensure the welding strength. The ultrasonic welding uses a circular high-speed steel needle with an effective welding diameter of 3-5 mm, which can ensure sufficient welding strength to prevent the battery from vibrating and causing the welding point to fall off and increase the internal resistance.

[0061] The second boss 330 can extend into the groove at the bottom of the shell 100, which facilitates the full contact between the current collector plate 300 and the bottom of the shell 100, thereby increasing the conductivity and reducing the internal resistance, which is beneficial to the large-rate charging and discharging of the battery.

[0062] In this embodiment, the second boss 330 is a circular boss, and the diameter of the second boss 330 is 6.0-6.4 mm.

[0063] The center of the second boss 330 coincides with the center of the current collector plate 300, and the diameter of the second boss 330 can be selected as 6.0 mm, 6.2 mm or 6.4 mm. For example, when the diameter of the second boss 330 is 6.2 mm, the diameter of the second boss 330 allows a tolerance of 0.5 mm, i.e. the diameter of the second boss 330 is 6.2 mm ± 0.5, which can be compatible with a roll needle with a diameter of 5 mm or 6 mm, overcoming the poor welding caused by the positioning deviation of the current collector plate 300, and improving the welding efficiency and rate.

[0064] In other embodiments, the second boss 330 can also be a rectangular boss or an elliptical boss, as long as it is convenient for welding with the inner bottom wall of the shell 100.

[0065] In this embodiment, the current collector plate 300 satisfies D0 = 30*D4 / 32, where D0 is the diameter of the current collector plate 300, and D4 is the diameter of the roll core 200.

[0066] It should be noted that the diameter D0 of the current collector plate 300 is related to the diameter D4 of the roll core 200, and when the diameter D4 of the roll core 200 changes, the diameter D0 of the current collector plate 300 is adjusted accordingly.

[0067] For example, when the diameter D4 of the roll core 200 is 32 mm, the diameter D0 of the current collector plate 300 is 30 mm, and at this time the diameter D0 of the current collector plate 300 allows a tolerance of 0.5 mm, i.e. the diameter D0 of the current collector plate 300 is 30 ± 0.5 mm. Compared with the aluminum-nickel composite strip, the current collector plate 300 can effectively increase the contact area with the roll core 200. In the case that the contact area between the current collector plate 300 and the roll core 200 is large enough, the assembly rework caused by the positioning deviation of the current collector plate 300 and the scrap rate can be reduced, and the production efficiency and rate of the equipment process can be improved.

[0068] In this embodiment, the current collector plate 300 is made of O-state pure aluminum material.

[0069] O-state pure aluminum is a material that has been completely annealed, with an aluminum content of more than 90%. The cost of O-state pure aluminum is 2 / 3 lower than that of aluminum-nickel composite material. The current collector plate 300 is made of O-state pure aluminum material, which can effectively improve the conductivity of the current collector plate 300, and effectively reduce the internal resistance of the battery and reduce heating. In other embodiments, the current collector plate 300 can also be made of aluminum-nickel mixed material.

[0070] The battery provided by the embodiments of the present application has at least the following beneficial effects: by providing the through hole 310 on the current collector plate 300, the infiltration of the electrolyte can be accelerated, the liquid injection efficiency can be improved, and the laser welding positioning can be facilitated, which can effectively improve the welding efficiency and success rate; the current collector plate 300 is made of O-state pure aluminum material, which can effectively eliminate metal chips and other foreign matter generated by laser welding, greatly reduce the battery K value and cost; by limiting the diameter and thickness of the current collector plate 300, the conductive area can be effectively increased, the internal resistance of the battery can be reduced, and the assembly efficiency and success rate can be effectively improved; by providing the first protrusion and the second protrusion on the current collector plate 300, the contact area with the winding core 200 and the shell 100 is respectively increased, the contact compactness is higher, and the conductivity is stronger, which effectively solves the problems of large internal resistance, heating and other problems among the winding core 200, the shell 100 and the current collector plate 300 in the prior art, increases the large-rate charge and discharge performance and safety performance of the battery; the current collector plate 300 and the bottom of the shell 100 are welded by ultrasonic welding process, which ensures the welding strength, generates less heat, effectively reduces the metal foreign matter generated by aluminum melting, and greatly reduces the battery K value; the current collector plate 300 is welded by ultrasonic welding process combined with laser welding process, which has faster welding speed, higher welding strength, stable structure and higher reliability.

[0071] The manufacturing process of the battery is illustrated by three embodiments. In the first embodiment, the battery is a cylindrical full-tab sodium ion battery with a diameter of 32 mm and a height of 140 mm. In the second embodiment, the battery is a cylindrical full-tab sodium ion battery with a diameter of 26 mm and a height of 70 mm. In the third embodiment, the battery is a cylindrical full-tab sodium ion battery with a diameter of 46 mm and a height of 80 mm.

[0072] Please refer to Figure 3 , the manufacturing process of the battery of the first embodiment is as follows:

[0073] Step one, rub the positive and negative tabs of the winding core 200, and perform short circuit test.

[0074] Step two, laser weld the positive tab of the winding core 200 after rubbing to the positive current collector plate 300, and the welding tension is greater than or equal to 12N.

[0075] Step three, laser welding the first boss 320 on the negative current collector 300 with the negative tab of the roll core 200, the welding line is a straight line, the diameter of the welding line is 1mm, the length is 7.5mm, the welding tension is greater than or equal to 8N, after welding, short circuit test is carried out, unqualified products are removed, and the qualified roll core 200 is loaded into the shell 100.

[0076] Step four, placing the shell 100 on the base of the ultrasonic device to fix the shell 100.

[0077] Step five, using an ultrasonic round head welding needle to pass through the center hole of the roll core 200 and press down, so that the second boss 330 of the negative current collector 300 is welded with the bottom of the shell 100, and the welding tension is greater than or equal to 34N.

[0078] The difference between example two and example one is that Figure 4 , the welding line in step three is a broken line, the diameter of the welding line is 0.2mm, and the length is 5.7mm.

[0079] The difference between example three and example one is that Figure 5 , the welding line in step three is a point, the diameter of the welding line is 0.8mm, and the length is 11.6mm.

[0080] The embodiments of the present application also provide an electric device comprising the above-mentioned battery. For example, the electric 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 and a spacecraft, etc. The embodiments of the present application do not specially limit the above-mentioned electric device.

[0081] In summary, the embodiments of the present application provide a battery and an electric device. When the thickness of the current collector 300 is 0.1-0.5mm, the thickness of the current collector 300 is in a relatively reasonable range, at this time, the internal resistance of the battery is smaller, and the strength of the current collector 300 is better, thereby ensuring that the battery has a better internal resistance while ensuring the structural strength of the battery.

[0082] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical range disclosed in the present application can be easily thought of by those skilled in the art, which should be covered in 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 close the containing cavity, the current collecting plate is connected with the roll core and the inner bottom wall of the shell, and the thickness of the current collecting plate is 0.1-0.5mm.

2. The battery of claim 1, wherein, The thickness of the current collecting plate is 0.2-0.4mm.

3. The battery of claim 1, wherein, A plurality of through holes are uniformly and circumferentially arranged on the current collecting plate, and in a cross section parallel to the surface of the current collecting plate facing the roll core, the cross section of each through hole comprises a first circular arc, a second circular arc and two third circular arcs, the centers of the first circular arc and the second circular arc are both the center of the current collecting plate, each third circular arc connects the two ends of the first circular arc and the second circular arc on the same side, and the diameter of the first circular arc is smaller than the diameter of the second circular arc.

4. The battery of claim 3, wherein, The current collecting plate satisfies: D1=7.5*D4 / 32, D2=12.5*D4 / 32, D3=5*D4 / 32, wherein D1 is the diameter of the first circular arc, D2 is the diameter of the second circular arc, D3 is the diameter of the third circular arc, and D4 is the diameter of the roll core.

5. The battery of claim 1, wherein, A plurality of first bosses are uniformly and circumferentially arranged on the surface of the current collecting plate facing the roll core, and the plurality of first bosses are all welded with the tab of the roll core.

6. The battery of claim 5, wherein, The first boss is a rectangular boss, and the current collecting plate satisfies: L=9.5*D4 / 32, W=3.5*D4 / 32, H=0.005*D4, D5=4.5*D4 / 32, wherein L is the length of the first boss, W is the width of the first boss, H is the height of the first boss, D4 is the diameter of the roll core, and D5 is the distance between the first boss and the center of the current collecting plate.

7. The battery of claim 1, wherein, A second boss is arranged at the center of the surface of the current collecting plate away from the roll core, the second boss is welded with the inner bottom wall of the shell, and the height of the second boss is 0.15-0.3mm.

8. The battery of claim 7, wherein, The second boss is a circular boss, and the diameter of the second boss is 6.0-6.4mm.

9. The battery of claim 1, wherein, The current collecting plate satisfies: D0=30*D4 / 32, wherein D0 is the diameter of the current collecting plate, and D4 is the diameter of the roll core.

10. The battery of claim 1, wherein, The current collecting plate is made of O-state pure aluminum material.

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

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