Full-tab collector plate and battery comprising same

Abstract

The all-tab battery comprises tabs, the current collecting plate comprises a plate surface, the plate surface is in a wave shape in the first direction, the first direction is the direction from the center of the plate surface to the periphery of the plate surface, the wave shape forms wave crests and wave troughs relative to the tabs, the wave crests protrude relative to the tabs, and the wave troughs are sunken relative to the tabs. The wave troughs are tightly connected with the tabs through a pressing effect, and the wavelengths of the wave crests and the wave troughs are gradually reduced or the amplitudes are gradually increased along the first direction; the uniformity degree of the number of the tabs in unit area contact in the troughs in the first direction is greater than the uniformity degree of the number of the tabs in unit area contact in the troughs of the current collecting plates with unchanged wavelengths and amplitudes. By adopting the technical scheme, the contact area of the current collecting plate and the tab can be increased, the contact uniformity of the current collecting plate and the tab can be improved, the conductivity of the current collecting plate of the full-tab battery can be improved, the non-uniform current distribution of the current collecting plate can be improved, and the conductivity consistency of the current collecting plate and the tab can be improved.

Description

Technical Field

[0001] The invention belongs to the field of current collecting plates, and relates to a full-ear battery current collecting plate and a battery. Background Art

[0002] In the existing manufacturing process of full-tab batteries, in order to ensure good contact between the tab and the collector plate, the tab is usually flattened (kneaded). This process aims to flatten the shape of the tab so that it fits tightly with the collector plate to allow current to flow.

[0003] In a full-ear battery, due to the large number and density of ear tabs, the untreated ear tabs may have certain curvature or irregularities, which prevents them from forming uniform and close contact with the surface of the collector plate. Through the flattening treatment, the surface of the ear tab can be flattened, which helps to optimize the connection quality between the ear tab and the collector plate. However, this process also has some problems and limitations. First, the flattening treatment requires the use of a certain mechanical force to flatten the ear tab, but during the flattening process, the metal structure of the ear tab may be affected by mechanical stress, resulting in material fatigue or damage, which in turn affects the conductivity and structural strength of the ear tab. Secondly, the flattening process usually requires precise process control to avoid excessive deformation or damage to the ear tab, which increases the complexity and cost of the production process. In addition, the effect of the flattening treatment depends on the accuracy and consistency of the process. In actual production, due to differences in the size, shape or material of the ear tab, the flattening treatment may not completely eliminate the uneven contact, and there is still a risk of local poor contact or excessive contact resistance, which in turn affects the overall performance and life of the battery.

[0004] In traditional battery design, the connection between the tabs and the current collector is achieved by welding after the tabs are flattened, and the current collector is a planar structure. This type of current collector has an uneven contact area when the tabs are in contact with the current collector. Since the distribution of the tabs is not completely uniform, local overheating or poor contact is prone to occur in the welding area, affecting the performance and life of the battery. In addition, stress concentration during welding may cause deformation of the tabs or the current collector, further exacerbating the problem of poor contact. As the battery capacity and energy density increase, the number and complexity of the tabs also increase, and the structure of the traditional planar current collector is difficult to meet the needs of efficient current conduction and reliable connection performance.

[0005] For example, patent document CN117317530A discloses a full-tab battery collector plate, a full-tab cylindrical battery and a welding method. After the tab is flattened, it is fixedly connected to the collector plate by welding, which results in uneven contact.

[0006] For example, patent document CN219067146U discloses a collector plate assembly of a full-tab battery and a full-tab battery. The collector plate is a planar structure. Since the collector plate is a planar structure, the contact surface between the tab and the collector plate after flattening mainly depends on welding points or local crimping, and it is difficult to achieve a uniform contact area. This will lead to uneven current distribution between the tab and the collector plate, excessive current density in some areas, and then cause local heating and increased resistance, affecting the performance and life of the battery.

[0007] The prior art flattens the tab and then fixes it to a planar current collecting plate by welding. However, the problems of how to increase the contact area between the current collecting plate and the tab, improve the uniformity of the contact between the current collecting plate and the tab, improve the conductivity of the current collecting plate of a full-tab battery, improve the uneven current distribution of the current collecting plate, optimize the current distribution of the current collecting plate, improve the consistency of the conductivity between the current collecting plate and the tab, improve the uniformity of charging and discharging of the full-tab battery, improve the overall performance and safety of the full-tab battery, simplify the production process, and improve production efficiency have not been effectively solved. Summary of the invention

[0008] The purpose of the present invention is to solve the problem of how to increase the contact area between the current collecting plate and the pole lug, improve the uniformity of the contact between the current collecting plate and the pole lug, improve the conductivity of the current collecting plate of the full-pole lug battery, improve the uneven current distribution of the current collecting plate, optimize the current distribution of the current collecting plate, improve the consistency of the conductivity between the current collecting plate and the pole lug, improve the uniformity of charging and discharging of the full-pole lug battery, improve the overall performance and safety of the full-pole lug battery, simplify the production process, and improve production efficiency.

[0009] In a first aspect, the present invention provides a current collector of a full-tab battery, the full-tab battery including tabs, the current collector including a disk surface, the disk surface being wavy along a first direction, the first direction being a direction from the center of the disk surface to the periphery of the disk surface, the wavy shape forming crests and troughs relative to the tabs, the crests protruding relative to the tabs, the troughs recessed relative to the tabs, the troughs being tightly connected to the tabs by a pressing action, the wavelengths of the crests and troughs gradually decreasing or the amplitudes gradually increasing along the first direction, so that the uniformity of the number of tabs contacted per unit area in the troughs along the first direction is greater than the uniformity of the number of tabs contacted per unit area in the troughs of a current collector with constant wavelength and amplitude.

[0010] The adoption of the above technical scheme can increase the contact area between the collector plate and the tab, improve the uniformity of the contact between the collector plate and the tab, improve the conductivity of the collector plate of the full-tab battery, improve the uneven current distribution of the collector plate, optimize the current distribution of the collector plate, improve the consistency of conductivity between the collector plate and the tab, improve the uniformity of charging and discharging of the full-tab battery, improve the overall performance and safety of the full-tab battery, simplify the production process, and improve production efficiency.

[0011] According to another specific embodiment of the present invention, the peaks and troughs satisfy one of the following conditions: (a) along the first direction, the wavelength remains unchanged and the amplitude gradually increases; or (b) along the first direction, the amplitude remains unchanged and the wavelength gradually decreases.

[0012] According to another specific embodiment of the present invention, along the first direction, the amplitude of the first trough is 101%-140% of the amplitude of the second trough, or the wavelength of the first trough is 60%-99% of the wavelength of the second trough, wherein the first trough is the outermost trough around the disk surface, and the second trough is the innermost trough in the center of the disk surface.

[0013] According to another specific embodiment of the present invention, the disk surface has a front side, the front side is the contact surface between the disk surface and the pole ear, the second direction is the direction away from the front side along the axial direction of the disk surface, and the height change of the disk surface in the second direction satisfies:

[0014] z(r)=0.7×sin(0.5×r 0.36 ×r) (Formula 1)

[0015] Wherein, z(r) represents the height of the disk surface in the second direction, and r represents the radius of the disk surface.

[0016] According to another specific embodiment of the present invention, the current collecting disk further includes a terminal, and the terminal is integrally formed with the disk surface.

[0017] According to another specific embodiment of the present invention, the terminal is a hollow cylinder, and the side of the terminal has a hollow structure, which is used to fuse the terminal when the current flowing through the full-tab battery exceeds a preset current.

[0018] According to another specific embodiment of the present invention, the unfolded shape of the hollow structure along the side surface is a rectangle, and the total length of the hollow structure on the circumference where the terminal is located satisfies:

[0019]

[0020] Among them, L0 represents the total length of the hollow structure on the circumference of the terminal, T0 represents the thickness of the terminal, k0 represents the overcurrent coefficient of the terminal, I represents the preset current, and r0 represents the radius of the terminal.

[0021] According to another specific embodiment of the present invention, the area of ​​the hollow structure accounts for 5%-50% of the side area of ​​the terminal.

[0022] According to another specific embodiment of the present invention, a plurality of flow guide holes evenly distributed along the circumferential direction are provided on the wave crest.

[0023] In a second aspect, the present invention further provides a full-tab battery, comprising a positive electrode current collector plate and a negative electrode current collector plate, wherein the positive electrode current collector plate and the negative electrode current collector plate are both current collector plates of the full-tab battery described above.

[0024] The above technical solution can increase the contact area between the collector plate and the tab, improve the uniformity of the contact between the collector plate and the tab, improve the conductivity of the collector plate of the full-tab battery, improve the uneven current distribution of the collector plate, improve the consistency of conductivity between the collector plate and the tab, simplify the production process, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram showing the structure of a current collecting plate in the prior art is shown;

[0026] Figure 2 Schematic diagram of the cross-sectional structure of the current collector of the full-tab battery in the embodiment of the present invention Figure 1 ;

[0027] Figure 3 Schematic diagram of the cross-sectional structure of the current collector of the full-tab battery in the embodiment of the present invention Figure 2 ;

[0028] Figure 4 A schematic diagram showing the structure of a current collecting plate of a full-tab battery in an embodiment of the present invention is shown;

[0029] Figure 5 Schematic diagram of the cross-sectional structure of the current collector of the full-tab battery in the embodiment of the present invention Figure 3 .

[0030] Explanation of symbols

[0031] 1 current collecting plate, 2 terminals, 3 plate surface, 4 welding wire, 5 pole ear, 6 winding core, 7 crest, 8 trough, 9 guide hole, 10 hollow structure. DETAILED DESCRIPTION

[0032] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0033] It should be noted that in this specification, similar reference numerals and letters denote 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 the subsequent drawings.

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] like Figure 1 As shown, the current collecting disk 1 of the prior art is a planar structure, and the pole lugs of the full-ear battery are flattened and welded to the pole lugs through the welding wires 4 on the disk surface 3 of the current collecting disk 1. Since the effect of the flattening of the pole lugs depends on the accuracy and consistency of the process, it may cause problems of uneven conductivity. The current collecting disk is a planar structure, with a small contact area with the pole lugs and limited conductivity. The prior art uses welding to fix the pole lugs to the disk surface 3 of the current collecting disk 1, and there is a problem of inconsistent conductivity uniformity at the welding point. The flattening and welding process procedures are complicated, and it is easy to produce problems such as metal chips and weld beads, which affect the consistency and performance of the full-ear battery. At the same time, flattening will also cause clogging of the guide holes, reducing the infiltration rate of the electrolyte inside the winding core.

[0036] First, refer to Figure 2 The present invention provides a current collector of a full-tab battery, the full-tab battery includes a tab 5, the current collector 1 includes a disk surface 3, the disk surface is wavy along a first direction, and the first direction is a direction from the center of the disk surface to the periphery of the disk surface, for example Figure 2 In the X direction shown, the wave shape forms a crest 7 and a trough 8 relative to the pole lug 5, the crest 7 protrudes relative to the pole lug 5, the trough 8 is recessed relative to the pole lug 5, the trough 8 is tightly connected to the pole lug 5 by compression, and the wavelength of the crest 7 and the trough 8 gradually decreases or the amplitude gradually increases along the first direction, so that the uniformity of the number of pole lugs 5 contacted per unit area in the trough 8 along the first direction is greater than the uniformity of the number of pole lugs 5 contacted per unit area in the trough 8 of the current collecting plate 1 with constant wavelength and amplitude.

[0037] Under the action of the pressing force, the extension direction of the pole ear 5 is consistent with that of the disk surface 3, and the pole ear 5 is in close contact with the disk surface 3. Compared with the prior art, the flattening process is saved, and manual flattening may cause the uniformity of the pole ear 5 after flattening to be inconsistent, thereby avoiding the uneven contact between the collector plate 1 and the pole ear 5 caused by manual flattening, and improving the consistency of the conductivity of the collector plate 1 and the pole ear 5.

[0038] The wavelength of the wave crest 7 and the wave trough 8 along the first direction gradually decreases or the amplitude gradually increases, so that the uniformity of the number of pole lugs contacted per unit area in the wave trough 8 along the first direction is greater than the uniformity of the number of pole lugs contacted per unit area in the wave trough 8 of the current collector 1 with constant wavelength and amplitude. Since the pole lugs 5 are evenly spaced when the full-pole lug battery core is unfolded, after the core 6 is rolled, the number of pole lugs in the outer layer of the disk surface periphery of the core 6 with the same thickness is greater than the number of pole lugs 5 in the inner layer of the disk surface center. The structure in which the wavelength of the wave crest 7 and the wave trough 8 along the first direction gradually decreases or the amplitude gradually increases can more evenly contact the pole lugs per unit area, improve the uniformity of conductivity, and improve the contact quality between the current collector and the pole lug 5. At the same time, the improvement of contact uniformity helps to improve the electrical performance of the battery, reduce contact resistance, and thus reduce power loss. At the same time, the structure in which the wavelength of the crest 7 and the trough 8 gradually decreases or the amplitude gradually increases along the first direction compensates for the contact area between the trough 8 and the pole lug 5, so that the contact area of ​​the trough 8 region is gradually adjusted as the position changes, so that the pole lugs 5 at different positions along the disk surface 3 can distribute the current more evenly. Compared with the scheme in which the amplitude and wavelength remain unchanged from the inside to the outside, the uniformity of the contacting pole lugs is increased, uneven conductivity is avoided, the uniformity of conductivity is improved, and the uniformity of charging and discharging of the full-pole lug battery is improved. This design helps to solve the problem of uneven current distribution in the inner and outer circles of the collector disk 1, optimizes the current distribution of the battery during operation, reduces local heating or excessive resistance, and thus improves the overall performance and safety of the battery.

[0039] The adoption of the above technical scheme can increase the contact area between the collector plate and the tab, improve the uniformity of the contact between the collector plate and the tab, improve the conductivity of the collector plate of the full-tab battery, improve the uneven current distribution of the collector plate, optimize the current distribution of the collector plate, improve the consistency of conductivity between the collector plate and the tab, improve the uniformity of charging and discharging of the full-tab battery, improve the overall performance and safety of the full-tab battery, simplify the production process, and improve production efficiency.

[0040] According to another specific embodiment of the present invention, the peak 7 and the trough 8 meet one of the following conditions: (a) along the first direction, the wavelength remains unchanged and the amplitude gradually increases; or (b) along the first direction, the amplitude remains unchanged and the wavelength gradually decreases. With the above technical solution, the collector plate 1 of the full-tab battery has a simple process and low design and manufacturing cost. Only a single variable needs to be controlled, and the wavelength remains unchanged and the amplitude gradually increases along the first direction; or the amplitude remains unchanged and the wavelength gradually decreases along the first direction, so as to achieve the effect of improving the conductivity of the collector plate 1 of the full-tab battery and improving the uneven current distribution of the collector plate 1. Since the number of tabs on the outer ring of the winding core is greater than that on the inner ring, the number of tabs contacted by the periphery of the collector plate 1 is greater than the number of tabs contacted by the center of the collector plate 1 at the same thickness along the first direction. The design wavelength remains unchanged and the amplitude gradually increases to increase the contact area between the periphery of the collector plate and the tabs, and ensure that the number of tabs contacted per unit area in the trough 8 is equal. The design is that along the first direction, the amplitude remains unchanged and the wavelength gradually decreases, which can reduce the number of pole lugs in contact with the periphery of the collecting plate 1 and ensure that the number of pole lugs in contact per unit area in the trough 8 is equal.

[0041] According to another specific embodiment of the present invention, Figure 3 As shown, along the first direction, the amplitude of the first trough 81 is 101%-140% of the amplitude of the second trough 82, or the wavelength of the first trough 81 is 60%-99% of the wavelength of the second trough 82, wherein the first trough 81 is the outermost trough at the periphery of the disk surface, and the second trough 82 is the innermost trough at the center of the disk surface. With the above technical solution, the amplitude of the first trough 81 is 101%-140% of the amplitude of the second trough 82, the total contact area between the first trough 81 of the disk surface 3 in the peripheral area of ​​the collector disk 1 and the pole ear is larger than the total contact area between the second trough 82 in the center of the disk surface 3 and the pole ear, the number of pole ears contacted by the first trough 81 of the disk surface 3 in the peripheral area of ​​the collector disk 1 is larger than the number of pole ears contacted by the second trough 82 of the disk surface 3 in the center of the collector disk, and the number of pole ears contacted by the corresponding unit area of ​​the trough 8 is equal, thereby improving the uniformity of current distribution. The wavelength of the first wave valley 81 is 60%-99% of the wavelength of the second wave valley 82 , so that the number of lugs contacting per unit area of ​​the first wave valley 81 at the periphery of the current collecting disk 1 and the second wave valley 82 at the center of the current collecting disk 1 is equal, thereby improving the uniformity of current distribution.

[0042] According to another specific embodiment of the present invention, referring to Figure 2 and Figure 3 The disk surface 3 has a front side, which is the contact surface between the disk surface 3 and the pole ear 5. The second direction is the direction away from the front side along the axial direction of the disk surface 3. For example, the second direction Figure 3 In the Z direction shown, the height change of the disk surface 3 in the second direction satisfies:

[0043] z(r)=0.7×sin(0.5×r 0.36×r) (Formula 1)

[0044] Wherein, z(r) represents the height of the disk surface 3 in the second direction, and r represents the radius of the disk surface 3. The disk surface 3 is wavy along the first direction, and the height change of the disk surface 3 in the second direction satisfies Formula 1. With the above technical solution, along the first direction Z, the amplitude remains unchanged, the amplitude is 0.7, and the wavelength g(r)=0.5×r 0.36 , the wavelength gradually decreases along the first direction as r increases, which can accurately make the number of pole ears contacted per unit area in the trough 8 along the first direction uniform. In the actual production process, it is only necessary to design and manufacture the collector plate 1 according to Formula 1 to improve production efficiency and reduce production costs. The height design according to Formula 1 can better adapt to the current distribution problem of the full-pole ear battery. The height difference of the disk surface 3 helps to compensate for the uneven distribution of current in different radius areas, ensuring that the collector plate 1 can evenly contact the pole ears from the center to the periphery, obtain relatively balanced current transmission, reduce the undercurrent caused by the uneven contact area of ​​the collector plate 1 with the pole ears 5, and improve the overall electrical performance of the battery.

[0045] In some embodiments, continue to refer to Figure 2 and Figure 3 , the height variation of the disk 3 in the second direction satisfies:

[0046]

[0047] Wherein, z(r) represents the height of the disk surface 3 in the second direction, r represents the radius of the disk surface 3, f(r) represents the amplitude of the disk surface 3, and g(r) represents the wavelength.

[0048] In some embodiments, along the first direction, as the radius r gradually increases, the amplitude f(r) gradually increases. At the same time, the wavelength g(r) may decrease as the radius r increases, or the wavelength g(r) may remain unchanged. The wavelength g(r) may also increase as the radius r increases, but it must be satisfied that the rate of change of the increase in wavelength g(r) is smaller than the rate of change of the increase in amplitude f(r). The specific formulas of the amplitude f(r) and the wavelength g(r) are not limited here, as long as the uniformity of the number of pole lugs contacted per unit area in the trough 8 along the first direction X is greater than the uniformity of the number of pole lugs contacted per unit area in the trough 8 of the collector plate 1 with constant wavelength and amplitude.

[0049] In some embodiments, along the first direction, as the radius r gradually increases, the wavelength g(r) gradually decreases. At the same time, the amplitude f(r) may increase as the radius r increases, or the amplitude f(r) may remain unchanged. The amplitude f(r) may also decrease as the radius r increases, but it must be satisfied that the rate of change of the decrease in the amplitude f(r) is smaller than the rate of change of the decrease in the wavelength g(r). The specific formulas of the amplitude f(r) and the wavelength g(r) are not limited here, as long as the uniformity of the number of pole lugs contacting per unit area in the trough 8 along the first direction is greater than the uniformity of the number of pole lugs contacting per unit area in the trough 8 of the collector plate 1 with constant wavelength and amplitude.

[0050] According to another specific embodiment of the present invention, the current collecting plate 1 further comprises a terminal 2, and the terminal 2 is integrally formed with the plate surface 3. Figure 1 , in the prior art, the terminal 2 is connected to the disk surface 3 by welding, and there is also the problem of uneven conductivity at the welding point. The welding method of the terminal 2 and the disk surface 3 in the prior art may generate contact resistance at the welding point, increasing the loss in current transmission. The welding process is easily affected by human or equipment accuracy, resulting in inconsistency in product quality. For example, the size of the welding point, the quality of welding, etc. will directly affect the electrical and mechanical properties. Using the above technical solution, the one-piece molding design of the present invention can completely avoid the existence of welding points, thereby eliminating the energy loss caused by welding resistance, so that the current can be more efficiently conducted between the terminal 2 and the disk surface 3 of the collector disk 1, and the conductivity of the collector disk 1 of the full-ear battery is improved. Through one-piece molding, the connection quality of the terminal 2 and the disk surface 3 can be kept consistent, reducing the process deviation that may occur during the production process, and ensuring that the performance of the product meets the consistency.

[0051] According to another specific embodiment of the present invention, Figure 4 and Figure 5 As shown, the terminal 2 is a hollow cylinder, and the side of the terminal 2 has a hollow structure 10, which is used to fuse the terminal when the current flowing through the full-ear battery exceeds the preset current. With the above technical solution, the design of the hollow structure 10 can actively fuse the terminal 2 when the current exceeds the preset value, which plays a role in overcurrent protection, effectively preventing problems such as battery overheating and component damage caused by overcurrent, and ensuring the safe operation of the current collecting plate of the full-ear battery. By fusing the terminal 2, the current can be quickly cut off to prevent the damage to the full-ear battery caused by overcurrent. Preferably, there are multiple hollow structures 10 of the terminal 2, and the hollow structures 10 are symmetrically distributed along the axial axis of the terminal 2.

[0052] According to another specific embodiment of the present invention, the unfolded shape of the hollow structure 10 along the side is a rectangle, and the total length of the hollow structure 10 on the circumference where the terminal 2 is located satisfies:

[0053]

[0054] Among them, L0 represents the total length of the hollow structure 10 on the circumference of the terminal 2, T0 represents the thickness of the terminal 2, k0 represents the overcurrent coefficient of the terminal 2, I represents the preset current, and r0 represents the radius of the terminal 2. By adopting the above technical scheme, the total length of the hollow structure can be designed according to different preset currents under the conditions of different terminal radii, different terminal 2 thicknesses and different overcurrent coefficients according to terminals of different materials, and then different hollow areas can be determined. The parameters can be adjusted according to different battery specifications and application scenarios to control the fusing behavior. For example, the radius r0 and thickness T0 of the terminal 2 can be adjusted according to actual needs while maintaining the overcurrent protection function of the collector plate of the full-pole ear battery. The present invention can flexibly adapt to different types of batteries and application requirements, and improve the adaptability and versatility of the collector plate overcurrent protection of the full-pole ear battery. The total length L0 of the hollow structure 10 is calculated by formula 2, which can ensure that the terminal 2 is accurately fused when the preset current is reached, and improve the accuracy of the collector plate overcurrent protection of the full-pole ear battery.

[0055] According to another specific embodiment of the present invention, the area of ​​the hollow structure accounts for 5%-50% of the side area of ​​the terminal. The above technical solution is adopted to retain a certain material strength while ensuring the fusing function. The terminal 2 can still maintain sufficient mechanical strength under normal operating current and will not easily break or fail, thereby ensuring the overall structural stability of the collector plate 1 and the full-ear battery. Within the area range of this hollow structure 10, it can be ensured that when the current exceeds the preset current, the terminal 2 can be reliably fused and cut off the current, preventing overcurrent and overheating inside the battery, and avoiding safety problems caused by overload.

[0056] According to another specific embodiment of the present invention, Figure 4 As shown, a plurality of flow guide holes 9 evenly distributed along the circumferential direction are provided on the wave crest 7. The wave trough 8 is tightly connected to the pole ear by compression, and the flow guide holes 9 are evenly arranged along the axial direction on the wave crest 7. With the above technical solution, the arrangement of the flow guide holes 9 evenly distributed along the circumferential direction can ensure the uniform distribution of the electrolyte, so that the electrolyte can smoothly flow into the winding core under the collecting plate 1, ensure the infiltration path of the electrolyte, and improve the infiltration and reflux speed of the electrolyte, thereby improving the overall performance and cycle efficiency of the battery. By designing the flow guide holes 9 for evenly injecting the electrolyte, the reliability and consistency of the battery can be effectively improved, thereby enhancing the working efficiency and service life of the battery.

[0057] In a second aspect, the present invention further provides a full-tab battery, comprising a positive electrode current collector plate and a negative electrode current collector plate, wherein the positive electrode current collector plate and the negative electrode current collector plate are both current collector plates of the full-tab battery described above.

[0058] By adopting the above technical solution, the contact area between the collector plate 1 and the pole lug 5 can be increased, the uniformity of the contact between the collector plate 1 and the pole lug 5 can be improved, the conductivity of the collector plate 1 of the full pole lug battery can be improved, the uneven current distribution of the collector plate 1 can be improved, the consistency of the conductivity between the collector plate 1 and the pole lug 5 can be improved, the production process can be simplified, and the production efficiency can be improved. The improvement of contact uniformity helps to improve the electrical performance of the battery, reduce the contact resistance, and thus reduce the power loss. At the same time, the structure in which the wavelength of the peak 7 and the trough 8 along the first direction X gradually decreases or the amplitude gradually increases makes the contact area of ​​the trough 8 area gradually adjust with the change of position, so that the pole lug 5 at different positions along the disk surface can distribute the current more evenly. Compared with the solution with constant amplitude and wavelength from inside to outside, the uniformity of the contacted pole lug is increased, uneven conductivity is avoided, and the uniformity of conductivity is improved. This design helps to solve the problem of uneven current distribution in the inner and outer circles of the collector plate, optimizes the current distribution of the battery during operation, reduces local heating or excessive resistance, and thus improves the overall performance and safety of the battery.

[0059] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A current collector of a full-tab battery, the full-tab battery comprising tabs, characterized in that: The current collecting disk includes a disk surface, the disk surface is wavy along a first direction, the first direction is a direction from the center of the disk surface to the periphery of the disk surface, the wavy shape forms a crest and a trough relative to the pole ear, the crest is protruding relative to the pole ear, the trough is recessed relative to the pole ear, and the trough is tightly connected to the pole ear through a pressing action, The wavelength of the crest and the trough gradually decreases or the amplitude gradually increases along the first direction, so that the uniformity of the number of pole ears contacted per unit area in the trough along the first direction is greater than the uniformity of the number of pole ears contacted per unit area in the trough of the collecting plate with constant wavelength and amplitude.

2. The current collecting plate of the full-tab battery according to claim 1, characterized in that: The peak and the trough satisfy one of the following conditions: (a) Along the first direction, the wavelength remains unchanged and the amplitude gradually increases; Or (b) along the first direction, the amplitude remains unchanged and the wavelength gradually decreases.

3. The current collecting plate of the full-tab battery according to claim 2, characterized in that: Along the first direction, the amplitude of the first wave valley is 101%-140% of the amplitude of the second wave valley, or the wavelength of the first wave valley is 60%-99% of the wavelength of the second wave valley, The first wave valley is the outermost wave valley around the disk surface, and the second wave valley is the innermost wave valley at the center of the disk surface.

4. The current collecting plate of the full-tab battery according to claim 2, characterized in that: The disk surface has a front side, the front side is the contact surface between the disk surface and the tab, the second direction is the direction away from the front side along the axial direction of the disk surface, and the height change of the disk surface in the second direction satisfies: z(r)=0.7×sin(0.5×r 0.36 ×r) (Formula 1) Wherein, z(r) represents the height of the disk surface in the second direction, and r represents the radius of the disk surface.

5. The current collecting plate of the full-tab battery according to claim 1, characterized in that: The current collecting disk further comprises a terminal, and the terminal is integrally formed with the disk surface.

6. The current collecting plate of the full-tab battery according to claim 5, characterized in that: The terminal is a hollow cylinder, and the side surface of the terminal has a hollow structure, which is used to fuse the terminal when the current flowing through the full-tab battery exceeds a preset current.

7. The current collecting plate of the full-tab battery according to claim 6, characterized in that: The unfolded shape of the hollow structure along the side surface is a rectangle, and the total length of the hollow structure on the circumference where the terminal is located satisfies: Among them, L0 represents the total length of the hollow structure on the circumference of the terminal, T0 represents the thickness of the terminal, k0 represents the overcurrent coefficient of the terminal, I represents the preset current, and r0 represents the radius of the terminal.

8. The current collecting plate of the full-tab battery according to claim 6, characterized in that: The area of ​​the hollow structure accounts for 5%-50% of the side area of ​​the terminal.

9. The current collecting plate of the full-tab battery according to claim 1, characterized in that: The wave crest is provided with a plurality of flow guide holes evenly distributed along the circumferential direction.

10. A full-tab battery, characterized in that: It comprises a positive electrode current collector disc and a negative electrode current collector disc, and both the positive electrode current collector disc and the negative electrode current collector disc are current collector discs of the full-tab battery as described in any one of claims 1 to 9.

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