Collecting plate, battery and battery pack

Abstract

The invention relates to the technical field of batteries, and provides a current collecting plate, a battery and a battery pack, the current collecting plate is provided with a first side face arranged towards a pole group and a second side face arranged opposite to the first side face, and the first side face is provided with a welding area and a flow guide area; the welding area is used for being welded with tabs of a pole group; the flow guide area is arranged to be inclined in the direction from the first side face to the second side face so as to guide the electrolyte to flow towards the periphery of the current collecting disc. According to the collector plate disclosed by the invention, the welding region is connected with the tab, and the inclined flow guide region is beneficial to guiding an electrolyte to flow towards the periphery of the collector plate, so that the problem that the electrolyte is easy to gather on the side surface of the collector plate in the prior art can be solved, and the flowing property of the electrolyte in the battery can be improved; therefore, the electrolyte injection and infiltration time can be shortened, and the electrolyte injection and infiltration efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a current collecting tray, and a battery and a battery pack provided with the current collecting tray. Background Art

[0002] The current collector plate is a key component of cylindrical batteries, and its performance is particularly important for cylindrical batteries. Currently, when electrolyte is injected from the top of the battery, it tends to accumulate on the corresponding side of the current collector plate at the bottom, hindering the flow and dispersion of the electrolyte. Therefore, to achieve a good infiltration effect, the injection time must be extended, which is not conducive to improving the injection and infiltration efficiency of the electrolyte. Summary of the Invention

[0003] In view of this, the present invention aims to provide a current collecting tray to improve the electrolyte injection and infiltration efficiency.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A current collecting plate, comprising a first side surface facing the pole group and a second side surface opposite to the first side surface, wherein the first side surface comprises a welding area and a flow guide area;

[0006] The welding area is used to be welded to the pole tab of the pole group;

[0007] The guide area is arranged to be inclined along a direction from the first side surface to the second side surface, so as to guide the electrolyte to flow toward the outer periphery of the current collecting plate.

[0008] Furthermore, the guide area includes a guide groove provided on the first side surface.

[0009] Furthermore, the guide groove extends from the middle of the first side surface to the edge of the collecting plate, and is inclined in the direction from the first side surface to the second side surface.

[0010] Furthermore, the guide grooves are multiple and spaced apart along the circumference of the collecting plate; the first side surface is divided into multiple dividing surfaces by the multiple guide grooves, and at least one of the dividing surfaces constitutes the welding area.

[0011] Furthermore, an included angle α between two adjacent guide grooves projected on the first side surface satisfies: 30°≤α≤60°.

[0012] Furthermore, an included angle β between the bottom of the guide groove and the first side surface satisfies: 2.5°≤β≤5.5°.

[0013] Furthermore, the width d of the guide groove satisfies: 0.7 mm ≤ d ≤ 1.3 mm.

[0014] Furthermore, the second side surface is provided with a pole integrally formed with the collecting disc.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The current collecting plate described in the present invention is connected to the electrode ear through the welding area, and the inclined guide area is conducive to guiding the electrolyte to flow toward the periphery of the current collecting plate. It can solve the problem that the electrolyte is easily accumulated on the side of the current collecting plate in the prior art, and is conducive to improving the flow performance of the electrolyte inside the battery, which is conducive to increasing the wetting speed of the electrode group, thereby shortening the injection and infiltration time of the electrolyte, and further improving the injection and infiltration efficiency of the electrolyte.

[0017] Secondly, the guide groove provides a clear flow path for the electrolyte, which is conducive to guiding the electrolyte to flow in a set direction. The guide groove can also concentrate the electrolyte in the groove, which can help reduce the overflow of the electrolyte on the first side, thereby more effectively guiding the electrolyte to the periphery of the collecting disk, further optimizing the flow distribution of the electrolyte, and helping to increase the wetting speed of the electrode group. The guide groove is set to extend from the middle of the first side to the edge of the collecting disk, which allows the electrolyte to flow from the center to the edge of the collecting disk, effectively preventing the electrolyte from gathering in the middle of the collecting disk, and promoting its more even distribution throughout the collecting disk, thereby improving the effect and efficiency of liquid injection and infiltration.

[0018] Furthermore, multiple circumferentially spaced flow guides can guide the electrolyte toward the periphery of the current collecting plate from multiple locations, improving the electrolyte's flow. The welding area is located on the dividing surface separated by the flow guides, which helps improve the stability and reliability of the welding. The multiple dividing surfaces provide multiple welding positions to choose from, facilitating the flexible selection of appropriate welding positions based on the battery's internal structure and design requirements, thereby improving the flexibility and adaptability of the connection between the current collecting plate and the electrode assembly. The range of angle α ensures a more uniform dispersion of the electrolyte on the current collecting plate, preventing the flow guides from being too densely packed due to a small angle α, thereby affecting the welding area, nor does an excessively large angle α reduce the flow guide efficiency of the flow guides.

[0019] In addition, the setting of the angle β range can make the flow state of the electrolyte in the guide groove achieve a better balance. If the angle β is less than 2.5°, the guide groove will be too flat, and the electrolyte will flow slowly by gravity, which is not conducive to improving the dispersion speed of the electrolyte. If the angle β is greater than 5.5°, it will easily cause the electrolyte to flow too fast, and splashing problems will easily occur at the edge of the collecting plate.

[0020] In addition, the width d of the flow guide groove is set within a certain range to effectively guide the flow of the electrolyte. If the width d of the flow guide groove is less than 0.7mm, the electrolyte will encounter greater resistance during flow, slowing the flow rate and thus affecting the injection and infiltration efficiency of the electrolyte. If the width d of the flow guide groove is greater than 1.3mm, the structural strength of the collector plate will be weakened, and the area of the welding area will also be affected. The design of the terminal post and the collector plate being integrally formed makes the connection between the terminal post and the collector plate more secure, which helps to reduce problems such as poor contact and increased resistance caused by loose connections, thereby improving the stability and reliability of the battery structure and also helping to improve production efficiency.

[0021] In addition, another object of the present invention is to provide a battery, comprising an electrode group and the above-mentioned current collecting plate, wherein the electrode tab of the electrode group is connected to the welding area of the current collecting plate.

[0022] The battery of the present invention, by providing the above-mentioned current collecting plate, is conducive to improving the injection and infiltration efficiency of the electrolyte and can enhance the performance of the battery.

[0023] In addition, the present invention also provides a battery pack comprising the battery described above.

[0024] The battery pack of the present invention is provided with the above-mentioned batteries, which helps to improve its own performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 This is a schematic structural diagram of the current collecting plate according to the first embodiment of the present invention from one viewing angle;

[0027] Figure 2 This is a schematic structural diagram of the current collecting plate according to the first embodiment of the present invention from another perspective;

[0028] Figure 3 A bottom view of the current collecting plate according to the first embodiment of the present invention;

[0029] Figure 4 for Figure 3 AA direction cross-sectional view in.

[0030] Description of reference numerals:

[0031] 1. Collecting plate; 101. First side; 1011. Guide groove; 1012. Separation surface; 1013. Welding area; 102. Second side; 1021. Pole. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0033] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0034] In the description of the present invention, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0035] Furthermore, in the description of the present invention, unless otherwise expressly defined, the terms "mounted," "connected," "connect," and "connector" should be interpreted broadly. For example, they may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will appreciate the specific meanings of these terms in the present invention based on the specific circumstances.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0037] Example 1

[0038] This embodiment relates to a collecting tray 1, which solves the technical problem of unreasonable structure of the collecting tray 1 in the prior art by optimizing its own structure. During the electrolyte injection process, the electrolyte easily accumulates on the side of the bottom collecting tray 1, thereby affecting the electrolyte injection and infiltration efficiency and effect.

[0039] Overall, the current collecting tray 1 of this embodiment has a first side surface 101 facing the electrode assembly, and a second side surface 102 opposite the first side surface 101. The first side surface 101 includes a welding region 1013 and a flow guide region. The welding region 1013 is used for welding to the electrode tab of the electrode assembly. The flow guide region is arranged at an angle from the first side surface 101 toward the second side surface 102 to guide the electrolyte toward the periphery of the current collecting tray 1.

[0040] The collecting plate 1 described in this embodiment is connected to the electrode ear through the welding area 1013, and through the inclined guide area, it is beneficial to guide the electrolyte to flow toward the periphery of the collecting plate 1, which is beneficial to solving the problem in the prior art that the electrolyte is easily accumulated on the side of the collecting plate 1, and is beneficial to improving the flow performance of the electrolyte inside the battery, and is beneficial to increasing the wetting speed of the electrode group, thereby shortening the electrolyte injection and infiltration time, and further improving the electrolyte injection and infiltration efficiency.

[0041] Based on the above overall introduction, an exemplary structure of the collecting plate 1 in this embodiment is as follows: Figures 1 to 4 As shown in . Among them, Figure 4 The vertical downward arrow on the right side of the middle collecting plate 1 is in the direction from the first side surface 101 to the second side surface 102 .

[0042] The collecting plate 1 in this embodiment is disc-shaped to facilitate application on cylindrical batteries. During the electrolyte injection process, the first side 101 of the collecting plate 1 is set upward and the second side 102 is set downward. As a preferred embodiment, the diversion area includes a diversion groove 1011 provided on the first side 101. The diversion groove 1011 here can provide a clear flow path for the electrolyte, which is conducive to guiding the electrolyte to flow in a set direction ( Figure 4 The flow guide groove 1011 can also concentrate the electrolyte in the groove, which can help reduce the overflow of the electrolyte on the first side 101, thereby more effectively guiding the electrolyte to the periphery of the collecting plate 1, which is conducive to further optimizing the flow distribution of the electrolyte.

[0043] As a preferred embodiment, Figure 3 and Figure 4 As shown in FIG, the guide groove 1011 extends from the middle of the first side 101 to the edge of the collecting tray 1 and is arranged obliquely in the direction from the first side 101 to the second side 102. This arrangement allows the electrolyte to flow from the center to the edge of the collecting tray 1, effectively preventing the electrolyte from gathering in the middle of the collecting tray 1 and promoting a more even distribution of the electrolyte throughout the collecting tray 1, thereby improving the efficiency and effectiveness of the injection and infiltration.

[0044] In some embodiments, multiple guide grooves 1011 are spaced apart circumferentially along the collecting plate 1; the first side surface 101 is divided into multiple partition surfaces 1012 by the multiple guide grooves 1011, at least one of which constitutes a welding region 1013. The multiple circumferentially spaced guide grooves 1011 can guide the electrolyte toward the periphery of the collecting plate 1 from multiple locations, thereby enhancing the electrolyte diversion effect. Compared to a single guide groove 1011, the arrangement of multiple guide grooves 1011 can prevent the electrolyte from flowing too fast or too slow in certain areas, ensuring that the electrolyte can flow more effectively outward, thereby improving the electrolyte injection and infiltration effect.

[0045] In addition, at least one of the partition surfaces 1012 is used as a welding area 1013 and connected to the tab, which helps improve the stability and reliability of the tab welding. The multiple partition surfaces 1012 provide multiple optional welding positions, which facilitates the flexible selection of appropriate welding positions according to the internal structure and design requirements of the battery, thereby improving the flexibility and adaptability of the connection between the current collecting plate 1 and the electrode group. In specific implementations, the tab is preferably arranged into a disc shape, which can facilitate the adaptation of the multiple partition surfaces 1012, thereby facilitating the welding connection of the tab to the welding area 1013 according to welding requirements.

[0046] As a preferred embodiment, refer to Figure 3 As shown in , the included angle α between the projections of two adjacent guide grooves 1011 on the first side surface 101 satisfies the following conditions: 30°≤α≤60°. The range of included angle α here ensures a more uniform dispersion of the electrolyte on the current collecting plate 1. A too small included angle α will not result in the guide grooves 1011 being too densely packed together and affecting the welding area 1013, nor will an excessively large included angle α result in reduced guide efficiency of the guide grooves 1011.

[0047] In a specific implementation, the angle α can be, for example, 30°, 35°, 40°, 42°, 44°, 45°, 46°, 48°, 50°, 55°, or 60°. The angle α is preferably 45°. In this case, the number of guide grooves 1011 is 8, and the number of dividing surfaces 1012 is also 8. The setting of the angle α within the range does not affect the structural strength of the current collecting plate 1 or the welding effect with the tab, while also having the effect of guiding the electrolyte.

[0048] The electrolyte collected on the first side 101 flows toward the periphery of the current collecting plate 1 via the multiple guide grooves 1011. This effectively guides the electrolyte, improving the injection efficiency and infiltration effect of the electrolyte. It should be noted that the angle α between the projections of two adjacent guide grooves 1011 on the first side 101 is equal to the central angle of the dividing surface 1012. Of course, the value of the angle α can be adjusted according to actual use requirements during implementation, as long as it meets the requirements.

[0049] As a preferred embodiment, Figure 4 As shown in , the angle β between the bottom of the guide groove 1011 and the first side surface 101 satisfies the following conditions: 2.5°≤β≤5.5°. The bottom of the guide groove 1011 is an inclined surface, and the angle β is set within a certain range to achieve a better flow state of the electrolyte in the guide groove 1011, which is conducive to increasing the flow rate of the electrolyte in the guide groove 1011. If the angle β is less than 2.5°, the guide groove 1011 will be too flat, and the speed of the electrolyte flowing by gravity will be slow, which is not conducive to increasing the dispersion speed of the electrolyte. If the angle β is greater than 5.5°, it is easy to cause the electrolyte to flow too fast, which is prone to splashing at the edge of the collecting plate 1.

[0050] In a specific implementation, the angle β can be, for example, 2.5°, 2.6°, 2.8°, 3°, 3.5°, 4°, 4.5°, 4.8°, or 5°. The angle β is preferably 4°, as this provides the best electrolyte diversion effect in the diversion groove 1011. Of course, the value of the angle β can also be adaptively adjusted according to usage requirements.

[0051] As a preferred embodiment, Figure 4 As shown in , in this embodiment, the width d of the guide groove 1011 satisfies the following conditions: 0.7 mm ≤ d ≤ 1.3 mm. The width d of the guide groove 1011 within this range can effectively guide the flow of the electrolyte. If the width d of the guide groove 1011 is less than 0.7 mm, the electrolyte will experience greater resistance during flow, slowing the flow rate and thus affecting the injection and infiltration efficiency of the electrolyte. If the width d of the guide groove 1011 is greater than 1.3 mm, the structural strength of the current collecting plate 1 will be weakened, and the area of the welding area 1013 will also be affected.

[0052] In this embodiment, the width d of the guide groove 1011 can be, for example, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, or 1.3 mm, etc. During implementation, the value of the width d of the guide groove 1011 can also be adjusted according to needs.

[0053] This embodiment optimizes the parameters of the guide grooves 1011, such as the width d of the guide grooves 1011, the angle α between the projections of two adjacent guide grooves 1011 on the first side 101, and the angle β between the bottom of the guide grooves 1011 and the first side 101. This not only takes into account the flow efficiency of the electrolyte, but also the production process requirements of the current collecting tray 1. In actual production, whether stamping, etching, or other forming processes, the guide grooves 1011 required by these parameters can be easily processed. The above parameter ranges cooperate with each other, making the production process of the current collecting tray 1 more stable and conducive to improving production efficiency while ensuring the performance of the current collecting tray 1.

[0054] Specifically, a suitable width d helps ensure that the electrolyte has sufficient channels and flows smoothly, without being clogged due to being too narrow or dispersed due to being too wide. The angle α determines the distribution density and angle of the guide groove 1011, allowing the electrolyte to spread evenly along a specific path and range on the collecting plate, avoiding localized accumulation or loss. The angle β controls the flow speed and direction of the electrolyte within the guide groove 1011, allowing it to flow along the groove at an appropriate speed and flow out smoothly. Combined with the width d and the angle α, it helps achieve uniform distribution of the electrolyte on the collecting plate, thereby improving the injection and infiltration effect of the electrolyte, and further improving the stability and consistency of battery performance.

[0055] Furthermore, the width d can ensure the flow of electrolyte while also taking into account the conductive area and mechanical strength of the collecting plate 1. The reasonable setting of the angle α helps to avoid the adverse effects of the guide grooves 1011 being too dense or sparse on the collecting plate structure, and ensures that the collecting plate 1 has sufficient strength to withstand the pressure inside the battery and the external forces. The size of the angle β optimizes the flow of electrolyte while minimizing the degree to which the depth and shape of the guide grooves 1011 weaken the structural strength of the collecting plate. In this embodiment, the three parameters of width d, angle α and angle β cooperate with each other to achieve a good electrolyte diversion function while maximizing the structural performance of the collecting plate 1, thereby improving the reliability and life of the collecting plate during battery use.

[0056] In some embodiments, the guide grooves 1011 in this embodiment can also be arranged upwardly and inclined from one side of the first side 101 to the other side. In this case, the electrolyte accumulated on the first side 101 can also flow from the bottom to the top through the guide grooves 1011, which can also reduce the problem of electrolyte accumulation on the first side 101 to a certain extent. In this case, the guide grooves 1011 can be arranged in a plurality of radially spaced intervals along the positive electrode guide plate. The first side 101 can still be divided into multiple dividing surfaces 1012 by the multiple guide grooves 1011, and some or all of the dividing surfaces 1012 can be selected as welding areas 1013 to be welded to the tab. However, to ensure the guiding effect of the guide grooves 1011, the thickness of the current collecting plate 1 should be appropriately increased to ensure the structural strength and stability of the current collecting plate 1 while achieving a good guiding effect.

[0057] As a preferred embodiment, the second side 102 is provided with a terminal post 1021 integrally formed with the current collecting disc 1. In this case, the current collecting disc 1 is specifically the positive electrode current collecting disc 1, and the terminal post 1021 is the positive electrode post. The integral design of the terminal post 1021 and the current collecting disc 1 strengthens the connection between the terminal post 1021 and the current collecting disc 1, thereby reducing problems such as poor contact and increased resistance caused by loose connections, thereby improving the stability and reliability of the battery structure.

[0058] Furthermore, the integrated manufacturing method can reduce assembly steps during the production process, eliminating the need for separate processes such as welding or riveting to connect the pole 1021 to the collector plate 1. This simplifies the production process, improves production efficiency, and reduces production costs and quality risks that may arise from multi-step assembly. In specific implementations, the pole 1021 is disposed in the middle of the second side surface 102. The pole 1021 preferably has a circular cross-section and is coaxial with the collector plate 1.

[0059] In this embodiment, the end of each guide groove 1011 facing the middle of the collecting plate 1 is preferably located outside the projection of the pole 1021 on the first side surface 101. This is beneficial to ensuring the structural strength of the connection between the collecting plate 1 and the pole 1021, and is also beneficial to improving the stability and reliability of the collecting plate 1 during use.

[0060] When the collecting tray 1 is used as the collecting tray 1 for the positive electrode of the battery, during the process of inverting the battery and injecting the electrolyte, the collecting tray 1 is set downward, and the electrolyte is injected at the negative end of the battery. At this time, the electrolyte flowing to the first side 101 can flow from the middle of the collecting tray 1 to the periphery through the multiple guide grooves 1011, thereby improving the flow effect of the electrolyte, and improving the injection efficiency and infiltration effect, which is beneficial to improving the injection efficiency without losing the infiltration effect of the electrode group.

[0061] When the collecting plate 1 is used as the collecting plate 1 for the negative electrode of the battery, during the process of injecting electrolyte into the battery, the collecting plate 1 is set downward. At this time, the electrolyte flowing to the first side 101 can flow from the middle of the collecting plate 1 to the periphery through multiple guide grooves 1011, thereby achieving a better electrolyte dispersion effect.

[0062] The current collecting tray 1 in this embodiment provides a clear flow path for the electrolyte by providing an inclined flow guide area on the first side 101 of the current collecting tray 1, specifically a plurality of circumferentially spaced flow guide grooves 1011 whose bottoms form a specific angle β (2.5°≤β≤5.5°) with the first side 101. The angle α between adjacent flow guide grooves 1011 projected on the first side 101 is a reasonable value (40°≤α≤50°), and the flow guide grooves 1011 have an appropriate width d (0.7mm≤d≤1.3mm). This facilitates uniform flow of the electrolyte from the center to the edge of the first side 101, helps minimize aggregation, thereby improving the uniformity of electrolyte distribution within the battery and enhancing the efficiency and effectiveness of electrolyte injection and infiltration.

[0063] Furthermore, the inclined guide groove 1011 uses the gravity component to accelerate the flow rate of the electrolyte, so that the electrolyte can flow rapidly, which is beneficial to shorten the electrolyte infiltration time, thereby improving the electrolyte infiltration efficiency, reducing the injection and infiltration effect of the electrolyte, and further improving production efficiency.

[0064] In addition, by optimizing the setting of the guide grooves 1011, the electrolyte can flow and infiltrate better, making the battery performance more stable, which is beneficial to improving the consistency of the overall performance of the battery and extending the service life of the battery. The reasonable separation surface 1012 separated by multiple guide grooves 1011 and the comprehensive influence of various parameters on the structure can help ensure that the collecting plate 1 has good strength while achieving the diversion function, so that it can withstand the internal pressure and external stress of the battery, and is not easy to deform or break, and is also beneficial to improving the structural stability and reliability of the battery. The separation surface 1012 separated by the guide grooves 1011 serves as a welding area 1013, which facilitates the welding of the pole ear and the collecting plate 1, and is beneficial to improving the welding quality. The welding position can be flexibly selected according to needs, which is beneficial to enhancing the adaptability of the connection between the collecting plate 1 and the pole group.

[0065] Example 2

[0066] This embodiment relates to a battery, comprising an electrode group and the current collecting disk 1 in the first embodiment, wherein the electrode tab of the electrode group is connected to the welding area 1013 of the current collecting disk 1 .

[0067] The battery of this embodiment is provided with the above-mentioned current collecting plate 1, which is beneficial to improving the infiltration efficiency of the electrolyte and enhancing the performance of the battery.

[0068] Example 3

[0069] This embodiment relates to a battery pack, including the battery described above.

[0070] The battery pack described in this embodiment is helpful in improving its own performance by providing the above-mentioned batteries.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A collecting plate, characterized in that: The current collecting plate has a first side surface facing the pole group and a second side surface opposite to the first side surface, and the first side surface has a welding area and a flow guide area; The welding area is used to be welded to the pole tab of the pole group; The guide area is arranged to be inclined along a direction from the first side surface to the second side surface, so as to guide the electrolyte to flow toward the outer periphery of the current collecting plate.

2. The collecting plate according to claim 1, characterized in that: The guide area includes a guide groove provided on the first side surface.

3. The collecting tray according to claim 2, characterized in that: The guide groove extends from the middle of the first side surface to the edge of the collecting plate, and is inclined along the direction from the first side surface to the second side surface.

4. The collecting tray according to claim 3, characterized in that: The guide grooves are multiple and spaced apart along the circumference of the collecting plate; The first side surface is divided into a plurality of dividing surfaces by the plurality of guide grooves, and at least one of the dividing surfaces constitutes the welding area.

5. The collecting tray according to claim 4, characterized in that: An included angle α between projections of two adjacent guide grooves on the first side surface satisfies: 30°≤α≤60°.

6. The collecting tray according to claim 2, characterized in that: An included angle β between the bottom of the guide groove and the first side surface satisfies: 2.5°≤β≤5.5°.

7. The collecting tray according to claim 2, characterized in that: The width d of the guide groove satisfies: 0.7 mm ≤ d ≤ 1.3 mm.

8. The collecting tray according to any one of claims 1 to 7, characterized in that: The second side surface is provided with a pole integrally formed with the collecting disc.

9. A battery, characterized in that: The method comprises a pole group and the current collecting disk according to any one of claims 1 to 8, wherein the pole lugs of the pole group are connected to the welding area of the current collecting disk.

10. A battery pack, characterized in that: A battery comprising the battery of claim 9.

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