Current collector plate, cover plate assembly and battery cell

Abstract

The application relates to a current collecting disc, a cover plate assembly and a battery cell, and belongs to the technical field of batteries. The current collecting disc comprises a disc body, a tail part and a flow passing piece; the edge of the disc body is provided with an opening; one end of the tail part is connected with one end of the disc body; the flow passing piece is arranged in the opening, part of the periphery of the flow passing piece is connected with the disc body, the flow passing piece has a protruding part protruding in a direction perpendicular to the disc body; the protruding part is configured to be in contact with the tail part when the current collecting disc is in a bent state. Through the above scheme, the flow passing piece can be arranged in the bending gap of the current collecting disc in the bent state to control the height size of the current collecting disc in the bent state, so that the height size of the battery cell is not affected, and the current collecting disc can pass current not only through the connection part between the disc body and the tail part but also through the contact between the flow passing piece and the tail part. In this way, the current passing area between the disc body and the tail part can be increased, so that the current passing capacity of the current collecting disc is improved, and the current passing capacity of the battery cell is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a current collector, cover plate assembly and battery cell. Background Technology

[0002] Battery cells (also known as battery units or single-cell batteries) are mainly divided into rechargeable secondary batteries and non-rechargeable primary batteries based on whether they are rechargeable. In related technologies, a battery cell includes a cover assembly, a housing, and an electrode assembly. The cover assembly includes a cover plate, a current collector, and terminals. The cover plate closes to the housing to define a cavity for containing the electrolyte and the electrode assembly. The terminals pass through the cover plate and are connected to the electrode assembly via the current collector.

[0003] As the requirements for battery charging and discharging power increase, the size of components involved in current flow in the battery cell is also increased to improve current flow capacity. However, the internal space of the battery cell is limited, and the size of components involved in current flow cannot be increased indefinitely. Therefore, how to improve the current flow capacity of the battery cell without affecting its size is the problem that this application aims to solve. Utility Model Content

[0004] This application provides a current collector, a cover plate assembly, and a battery cell, which can improve the current carrying capacity of the battery cell without affecting its size.

[0005] To achieve the above objectives, according to a first aspect of this application, a current collector is provided, comprising a body, a tail portion, and a current-carrying element; an opening is provided on the edge of the body; one end of the tail portion is connected to one end of the body; the current-carrying element is disposed at the opening, a portion of the periphery of the current-carrying element is connected to the body, and the current-carrying element has a protrusion extending in a direction perpendicular to the body; wherein the protrusion is configured to contact the tail portion when the current collector is bent. Thus, by providing the current-carrying element, the current collector can carry current not only through the connection between the body and the tail portion, but also through the current-carrying element. This increases the current-carrying area between the body and the tail portion, thereby improving the current-carrying capacity of the current collector and consequently improving the current-carrying capacity of the battery cell.

[0006] Optionally, a groove is provided on the side of the current-carrying component away from the protrusion, the groove corresponding to the protrusion, and the end of the groove away from the slot opening is located inside the protrusion. In this way, the current-carrying component can have a larger contact area with the tail end, and the material used in the current collector can be reduced to reduce the weight of the current collector, thereby helping to improve the energy density of the battery cell.

[0007] Optionally, the flow element is bent to form a protrusion on one side and a groove on the other side. This allows for simultaneous forming of the groove and protrusion through bending, improving the forming efficiency of the collector plate. Furthermore, the bending configuration enhances the elasticity of the flow element, facilitating elastic deformation by compression, thereby increasing the compressive force between the tail and the protrusion. This, in turn, improves the flow capacity and reliability between the protrusion and the tail.

[0008] Optionally, the tail has a width dimension W1, and in the direction of the tail width dimension W1, the protrusion has a width dimension W2, satisfying: 0 < W2 ≤ 70% W1. In this way, the width dimension W2 of the protrusion is prevented from being too large and exceeding the edge of the tail, thereby ensuring that the protrusion maintains an effective contact area with the tail.

[0009] Optionally, 30% W1≤W2≤45% W1. In this way, on the one hand, the protrusion can have a suitable width W2 to ensure the flow performance between the protrusion and the tail, and on the other hand, the size of the protrusion can be avoided from being too large and affecting the setting of other structures on the disk.

[0010] Optionally, the thickness of the current-carrying component is less than the thickness of the disk body. This shortens the heat conduction path of the current-carrying component, improves its efficiency, and thus enhances the heat dissipation efficiency of the current collector disk, thereby improving the heat dissipation efficiency of the battery cell.

[0011] Optionally, when the collector plate is in the unfolded state, the distance between the surface of the protrusion away from the plate body and the plate body is E; when the collector plate is in the bent state, the distance between the opposite surfaces of the plate body and the tail is e, satisfying: 1e < E ≤ 3e. Thus, after the collector plate is folded, the current-carrying component is clamped between the tail and the electrode assembly. That is, the current-carrying component has an interference fit with the gap between the tail and the electrode assembly in the height direction, thereby allowing the current-carrying component to have a supporting force on the tail and the electrode tab, maintaining stable contact between the current-carrying component and the tail and the electrode tab, thereby improving the reliability of current flow between the current-carrying component and the tail, as well as the reliability of current flow between the collector plate and the electrode tab.

[0012] Optionally, the flow-through component includes a main body and a protrusion. The main body is disposed at the opening, and one end of the main body is connected to the disk body. The protrusion is connected to the main body. The main body is configured to connect to the electrode tab. This increases the flow area between the current collector and the electrode tab, thereby improving the current-through capacity of the current collector.

[0013] Optionally, the disc body is provided with a pressure relief clearance port, which is connected to an opening. In this way, the clearance area for pressure relief on the disc body can be increased through the opening, thereby improving the smoothness and speed of fluid flow through the disc body when the battery cell is depressurized.

[0014] Optionally, when the collector plate is in the deployed state, the opening is located on the side of the plate body away from the tail, and the end of the flow-through component near the tail is connected to the collector plate. This improves the structural symmetry of the plate body, making the collector plate more uniformly stressed, thereby improving the stress state of the collector plate and enhancing its reliability.

[0015] Optionally, the tail portion includes a first sub-section and a second sub-section, with the second sub-section connecting the first sub-section and the disk body; wherein, when the current collector is in a bent state, the second sub-section is folded between the first sub-section and the disk body. This increases the elasticity of the current collector in the bent state, thereby increasing the compression of the current collector and ensuring stable contact between the current collector and the electrode post and electrode assembly, thus improving the reliability of the connection between the current collector and the electrode post and electrode assembly.

[0016] Optionally, the disc body protrudes outward on the side opposite to the protrusion to form a protruding tab welding area on that side, and a recess is formed on the side of the disc body near the protrusion. This creates a gap between the disc body and the electrode assembly, facilitating electrolyte flow and improving the wetting efficiency of the electrode assembly. And / or, a through groove is provided at the bending point of the manifold, extending along the center line of the bend. When the manifold is bent, the through groove is located on the concave surface of the manifold. This reduces the resistance of the material used to form the concave surface of the manifold to bending, thus improving the smoothness of the manifold bending.

[0017] Optionally, the collector plate also includes a connector, one end of which is connected to the end of the flow-through component away from the center of the plate body, and the other end is configured to connect to the tail portion near the opening when the collector plate is in a bent state. This increases the flow area between the plate body and the tail portion, thereby improving the flow capacity of the collector plate.

[0018] Optionally, the tail section includes a first sub-section and a second sub-section, with the second sub-section connecting the first sub-section and the disk body. When the collector disk is in a bent state, the second sub-section folds between the first sub-section and the disk body, forming a bend between the first and second sub-sections. The connector is configured to engage with the bend when the collector disk is bent. This achieves both a connection between the connector and the portion of the tail section near the opening and a simple and reliable connection structure between the connector and the tail section.

[0019] Optionally, a slot is provided at the tail end. When the collector plate is bent, the protrusion inserts into the slot and contacts the inner wall of the slot. This increases the contact area between the flow-through component and the tail end, thereby improving their flow capacity. Furthermore, the interference fit between the flow-through component and the slot prevents the collector plate from springing back relative to the tail end after bending, thus improving the stability of the collector plate in a bent state.

[0020] Secondly, embodiments of this application provide a cover plate assembly, which includes a cover plate, an electrode post, a lower plastic component, and the aforementioned current collector; the electrode post passes through the cover plate; the tail end away from the plate body is connected to the electrode post; the lower plastic component is disposed between the cover plate and the current collector. This reduces the resistance of the current collector, thereby reducing Joule heat generated by the battery cell during charging and discharging, and thus improving the charging and discharging efficiency of the battery cell.

[0021] Thirdly, embodiments of this application provide a battery cell comprising a housing, an electrode assembly, and the aforementioned cover assembly; the electrode assembly is disposed within the housing; the cover is closed to the housing, a current collector is connected to the electrode assembly, and a current collector is folded and disposed between the electrode assembly and the cover. This reduces the resistance of the current collector, thereby reducing Joule heat generated during charging and discharging, and thus improving the charging and discharging efficiency of the battery cell.

[0022] In the current collector of this embodiment, by providing a current-carrying component and ensuring that the component contacts the tail end when the current collector is bent, the current-carrying component can be arranged within the bending gap of the bent current collector to control its height and avoid affecting the battery cell height. Furthermore, the current-carrying component can carry current not only through the connection between the collector body and the tail end but also through the contact between the component and the tail end. This not only increases the current-carrying area between the collector body and the tail end, thus improving the current-carrying capacity of the current collector and the battery cell, but also allows some current to bypass the connection between the collector body and the tail end, flowing directly through the component, thereby shortening the current-carrying path between the collector body and the tail end. This reduces the resistance of the current collector, thereby reducing Joule heat generated by the battery cell during charging and discharging, and further improving the battery cell's current-carrying capacity.

[0023] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0025] Figure 1 This is a schematic diagram of the battery cell structure provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the cover plate assembly provided in an embodiment of this application; Figure 3 This is a schematic diagram of the collector disk in its deployed state, provided in an embodiment of this application. Figure 4 This is a side view of the manifold in a bent state provided in an embodiment of this application; Figure 5 This is a schematic diagram of the internal structure of the collector disk provided in an embodiment of this application; Figure 6 This is a side view of the data collector in its deployed state, provided in an embodiment of this application; Figure 7 This is a schematic diagram of the internal structure of another collector disk provided in an embodiment of this application; Figure 8 This is a schematic diagram illustrating the fit between the protrusion and the tail provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures: 1000 - Cell; 200 - Housing; 300 - Electrode assembly; 100-Cover assembly; 101-Cover; 102-Pole post; 103-Lower plastic part; 104-Upper plastic part; 105-Terminal; 106-Explosion-proof valve; 10-Collector disk; 11-Disc body; 111-Core positioning hole; 112-Groove; 115-Electrode welding area; 116-Recess; 117-Pressure relief port; 118-Through groove; 119-Opening; 12-Tail section; 121-First sub-section; 122-Second sub-section; 123-Slot; 124-Protrusion; 125-Bend section; 13-Flow passage component; 134-Protrusion; 135-Main body; 14-Connector. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0028] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such a product.

[0032] Before introducing the current collector, cover plate assembly, and battery cell provided in the embodiments of this application, the relevant technologies of this application will be introduced first. In the relevant technologies, with the increasing requirements for battery charging and discharging power, the current-carrying components of the battery cell are also increased in size to improve the current-carrying capacity. For example, the thickness of the current collector can be increased to improve the current-carrying capacity of the current collector. However, simply increasing the thickness of the current collector has limited effect on improving the current-carrying capacity of the current collector, and at the same time, it will cause the current collector to occupy a large space inside the battery cell, affecting the energy density of the battery cell. Furthermore, a larger thickness of the current collector will increase the bending moment resistance of the current collector, thereby increasing the difficulty of bending the current collector and resulting in low bending forming efficiency. In addition, a larger thickness of the current collector will also increase the difficulty of welding the current collector to components such as electrode assemblies.

[0033] Furthermore, to improve the ease of welding the current-carrying components to the terminals and electrode assemblies, the current collector is designed as a bent component. That is, during cell assembly, the current collector is flattened, with one end welded to the terminal and the other end welded to the tab of the electrode assembly. After welding, the current collector is bent, folding it along the axial direction of the cell so that it is positioned between the electrode assembly and the cover plate. This results in a longer current path when current flows through the current collector, requiring the current to be transferred from one end to the other. A longer current path means an increased conductive distance for the current collector. According to the resistance formula R=ρL / S (where ρ is resistivity, L is the current path length, and S is the cross-sectional area of ​​the current path), an increased current path length L directly leads to an increase in the current collector's own resistance R. Increased resistance leads to increased Joule heat generated during cell charging and discharging, resulting in a decrease in the cell's charging and discharging efficiency.

[0034] Based on this, embodiments of this application provide a current collector, a cover plate assembly, and a battery cell, which can effectively improve the current carrying capacity of the current collector and shorten the current carrying path of the current carrying components, thereby improving the charging and discharging efficiency of the battery cell.

[0035] The following combination Figures 1 to 8 The present application provides a detailed description of a current collector 10, a cover plate assembly 100, and a battery cell 1000 provided in the embodiments of this application.

[0036] Please see Figure 1 This application provides a battery cell 1000, which includes a housing 200, an electrode assembly 300, and a cover plate assembly 100. The electrode assembly 300 is disposed within the housing 200. The cover plate 101 of the cover plate assembly 100 covers the housing 200, and the terminal post 102 of the cover plate assembly 100 is connected to the electrode assembly 300.

[0037] Understandably, the housing 200 is also used to store electrode liquid.

[0038] It is understood that in the embodiments of this application, the battery cell 1000 may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and the embodiments of this application are not limited thereto. The battery cell 1000 may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0039] The electrode assembly 300 includes a positive electrode, a separator, and a negative electrode stacked sequentially. The separator insulates and isolates the positive and negative electrodes and provides channels for the flow of metal ions. The cell 1000 primarily relies on the movement of metal ions between the positive and negative electrodes to achieve charging and discharging. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector protrudes beyond the edge of the coated positive current collector, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector without the negative electrode active material layer protrudes from the edge of the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc.

[0040] Please see Figure 2 This application provides a cover plate assembly 100. The cover plate assembly 100 includes a cover plate 101, an electrode post 102, a lower plastic component 103, and a collector plate 10. The electrode post 102 passes through the cover plate 101. One end of the collector plate 10 is connected to the electrode post 102, and the other end is connected to the electrode tab of the electrode assembly 300. The lower plastic component 103 is disposed between the end of the collector plate 10 connected to the electrode post 102 and the cover plate 101.

[0041] Specifically, the current collector 10 is folded and disposed between the electrode assembly 300 and the cover plate 101. At this time, the lower plastic part 103 is located between the cover plate 101 and the current collector 10 in the folded state. When the current collector 10 is folded, the body 11 and the tail 12 of the current collector 10 are folded together, thereby forming an arc transition zone at the connection between the body 11 and the tail 12. Due to the deformation of the arc transition zone caused by bending, the inner side is compressed and the outer side is stretched. Therefore, under the limiting effect of the material inside the arc transition zone and the rebound effect of the current collector 10, a gap is formed between the body 11 and the tail 12, which can be called the bending gap. The current-carrying component 13 provided in the embodiment of this application is disposed within this bending gap so as not to occupy additional space of the cell 1000, so that the placement of the current-carrying component 13 does not affect the size of the cell 1000.

[0042] It is understood that the cover plate assembly 100 may also include an explosion-proof valve 106, an upper plastic part 104, and a sealing ring. The explosion-proof valve 106 is mounted on the cover plate 101. Additionally, when the pole post 102 is an inverted T-shaped pole post 102, the cover plate assembly 100 may also include a terminal 105. Specifically, the large-diameter end of the pole post 102 is located on the side of the lower plastic part 103 facing away from the cover plate 101, and the small-diameter end of the pole post 102 passes through the lower plastic part 103 and the cover plate 101 in sequence before connecting to the terminal 105. The upper plastic part 104 is disposed between the terminal 105 and the cover plate 101 to insulate and isolate the terminal 105 and the cover plate 101. The sealing ring is ring-shaped on the pole post 102 and located between the pole post 102 and the cover plate 101 to seal the mating part between the cover plate 101 and the pole post 102, preventing electrolyte leakage from this part.

[0043] It is understood that the lower plastic part 103 is used to insulate the cover plate 101 from the internal conductive parts of the battery cell 1000. Specifically, the lower plastic part 103 insulates the cover plate 101 from the large-diameter end of the electrode post 102, the cover plate 101 from the current collector 10, and the cover plate 101 from the electrode assembly 300. At the same time, the cover plate 101 can be axially pressed against the electrode assembly 300 by the lower plastic part 103 to improve the synchronization between the electrode assembly 300 and the housing 200 and prevent the electrode assembly 300 from shaking relative to the housing 200.

[0044] Please see Figure 3 and Figure 4 This application provides a manifold 10. The manifold 10 includes a body 11, a tail portion 12, and a flow-through component 13. An opening 119 is provided on the edge of the body 11. One end of the tail portion 12 is connected to one end of the body 11. The flow-through component 13 is disposed at the opening 119. A portion of the periphery of the flow-through component 13 is connected to the body 11. The flow-through component 13 has a protrusion 134 extending in a direction perpendicular to the body 11. The protrusion 134 is configured to contact the tail portion 12 when the manifold 10 is in a bent state.

[0045] It is understood that the disk body 11, the tail section 12, and the current-carrying component 13 are all conductive structures. For example, when the current collector 10 is connected to the positive electrode tab of the battery cell 1000, and the positive electrode tab is made of aluminum foil, the disk body 11, the tail section 12, and the current-carrying component 13 are all made of aluminum. As another example, when the current collector 10 is connected to the negative electrode tab of the battery cell 1000, and the negative electrode tab is made of copper foil, the disk body 11, the tail section 12, and the current-carrying component 13 are all made of copper.

[0046] It is understood that the disk body 11 and the tail 12 are integrally set so that when the collector disk 10 is in the unfolded state, the disk body 11 and the tail 12 are respectively welded to the electrode assembly 300 and the pole post 102. After the welding is completed, the collector disk 10 can be folded and set between the pole post 102 and the electrode assembly 300 by bending the collector disk 10.

[0047] For example, the manifold 10 is bent once to be folded between the pole post 102 and the electrode assembly 300. In this case, the side view of the manifold 10 can be U-shaped (or C-shaped).

[0048] For example, the collector plate 10 is bent twice to fold between the electrode post 102 and the electrode assembly 300. In this case, the side view of the collector plate 10 can be Z-shaped, such as... Figure 4 As shown.

[0049] It is understandable that the flow-through component 13 can be integrally set with the disk body 11 or welded to the disk body 11.

[0050] The disk body 11 is provided with a core positioning hole 111, which is used to determine the relative position between the current collector 10 and the electrode assembly 300 when the current collector 10 is welded to the electrode assembly 300.

[0051] In this embodiment, by providing a current-carrying component 13 and ensuring that it contacts the tail portion 12 when the current collector 10 is bent, the current-carrying component 13 can be arranged within the bending gap of the bent current collector 10 to control its height and avoid affecting the height of the battery cell 1000. Furthermore, the current collector 10 can carry current not only through the connection between the plate body 11 and the tail portion 12, but also through the contact between the current-carrying component 13 and the tail portion 12. This not only increases the current-carrying area between the plate body 11 and the tail portion 12, thus improving the current-carrying capacity of the current collector 10 and the battery cell 1000, but also allows some current to bypass the connection between the plate body 11 and the tail portion 12 and flow directly through the current-carrying component 13, shortening the current-carrying path between the plate body 11 and the tail portion 12. This reduces the resistance of the current collector 10, thereby reducing the Joule heat generated by the cell 1000 during charging and discharging, which in turn helps to improve the overcurrent capability and charging and discharging efficiency of the cell 1000.

[0052] Furthermore, by placing the flow-through component 13 in the opening 119 and connecting a portion of its periphery to the collector plate 10, another portion of the periphery of the flow-through component 13 is left suspended. Thus, when the protrusion 134 contacts the tail 12 to achieve flow passage, the deformation of the connection between the flow-through component 13 and the collector plate 10 can be increased based on the side where the flow-through component 13 is suspended. This increases the compressive force formed by the contact between the tail 12 and the protrusion 134, thereby improving both the reliability of flow passage between the protrusion 134 and the tail 12 and increasing the contact area between the flow-through component 13, the protrusion 134, and the tail 12, thereby enhancing the flow capacity.

[0053] Furthermore, the current collector 10 provided in this embodiment not only improves the current carrying capacity of the current collector 10, but also takes into account the characteristics of the current collector 10 being easy to weld and fold for installation.

[0054] Please see Figure 5 In some embodiments, a groove 112 is provided on the side of the current-carrying member 13 opposite to the protrusion 134. The groove 112 is correspondingly provided to the protrusion 134, and the end of the groove 112 away from the slot opening is disposed inside the protrusion 134. In this way, the current-carrying member 13 can have a larger contact area with the tail 12, and the material used in the current collector 10 can be reduced to reduce the weight of the current collector 10, thereby facilitating the improvement of the energy density of the battery cell 1000.

[0055] In addition, the above settings can increase the surface area of ​​the current collector 10, thereby increasing the heat dissipation area of ​​the current collector 10 and improving the heat dissipation efficiency of the battery cell 1000.

[0056] Please see Figure 5 In some embodiments, the flow passage 13 is bent to form a protrusion 134 on one side and a groove 112 on the other side. This allows for the simultaneous forming of the groove 112 and the protrusion 134 through bending, improving the forming efficiency of the collector plate 10. Furthermore, the bending configuration enhances the elasticity of the flow passage 13, facilitating its elastic deformation under pressure. This increases the compressive force between the tail portion 12 and the protrusion 134, thereby improving the flow capacity and reliability between the protrusion 134 and the tail portion 12.

[0057] Please see Figure 6 In some embodiments, the tail portion 12 has a width dimension W1, and in the direction of the width dimension W1 of the tail portion 12, the protrusion 134 has a width dimension W2, satisfying: 0 < W2 ≤ 70% W1.

[0058] It is understood that the width dimension W2 of the protrusion 134 includes, but is not limited to, 2.41%W1, 4.83%W1, 7.24%W1, 9.66%W1, 12.07%W1, 14.48%W1, 16.9%W1, 19.31%W1, 21.72%W1, 24.14%W1, 26.55%W1, 28.97%W1, 31.38%W1, and 33%. .79%W1, 36.21%W1, 38.62%W1, 41.03%W1, 43.45%W1, 45.86%W1, 48.28%W1, 50.69%W1 , 53.10%W1, 55.52%W1, 57.93%W1, 60.34%W1, 62.76%W1, 65.17%W1, 67.59%W1, 70%W1.

[0059] In this embodiment, by limiting the above, the width W2 of the protrusion 134 can be prevented from being too large and extending beyond the edge of the tail 12, thereby ensuring that the protrusion 134 and the tail 12 maintain an effective contact area.

[0060] For example, 30% W1≤W2≤45% W1.

[0061] It is understood that the width W2 of the protrusion 134 includes, but is not limited to, 30%W1, 30.52%W1, 31.03%W1, 31.55%W1, 32.07%W1, 32.59%W1, 33.10%W1, 33.62%W1, 34.14%W1, 34.66%W1, 35.17%W1, 35.69%W1, 36.21%W1, and 36.72%. %W1, 37.24%W1, 37.76%W1, 38.28%W1, 38.79%W1, 39.31%W1, 39.83%W1, 40.34%W1, 40.86 %W1, 41.38%W1, 41.89%W1, 42.41%W1, 42.93%W1, 43.45%W1, 43.96%W1, 44.48%W1, 45%W1.

[0062] In this embodiment, the above-mentioned limitations can, on the one hand, ensure that the protrusion 134 has a suitable width W2 to guarantee the flow performance between the protrusion 134 and the tail 12, and on the other hand, prevent the protrusion 134 from being too large and affecting the arrangement of other structures on the disk body 11.

[0063] Please see Figure 5 In some embodiments, the thickness D11 of the current-carrying element 13 is smaller than the thickness D12 of the disk body 11. This shortens the heat conduction path of the current-carrying element 13, improves the efficiency of the current-carrying element 13, and thus improves the heat dissipation efficiency of the current collector 10, thereby improving the heat dissipation efficiency of the battery cell 1000.

[0064] Please see Figure 4 and Figure 5 In some embodiments, when the collector disk 10 is in the unfolded state, the distance between the surface of the protrusion 134 away from the disk body 11 and the disk body 11 is E. When the collector disk 10 is in the bent state, the distance between the opposite surfaces of the disk body 11 and the tail 12 is e, satisfying: 1e<E≤3e.

[0065] It is understood that the height dimension E of the flow passage 13 includes, but is not limited to, 1.1e, 1.2e, 1.3e, 1.4e, 1.5e, 1.6e, 1.7e, 1.8e, 1.9e, 2.0e, 2.1e, 2.2e, 2.3e, 2.4e, 2.5e, 2.6e, 2.7e, 2.8e, 2.9e, and 3e.

[0066] For example, 1.5e≤E≤2.5e.

[0067] In this embodiment, by means of the above-mentioned limitations, after the current collector 10 is folded, the current flow element 13 is clamped between the tail 12 and the electrode assembly 300. That is, the current flow element 13 is interference-fitted with the gap between the tail 12 and the electrode assembly 300 in the height direction, so that the current flow element 13 has a supporting force on the tail 12 and the electrode tab, so that the current flow element 13 maintains stable contact with the tail 12 and the electrode tab, thereby improving the reliability of current flow between the current flow element 13 and the tail 12 and the reliability of current flow between the current collector 10 and the electrode tab.

[0068] Please see Figure 5 In some embodiments, the flow element 13 includes a body 135 and a protrusion 134. The body 135 is disposed in the opening 119, and one end of the body 135 is connected to the disk body 11. The protrusion 134 is connected to the body 135. The body 135 is configured to connect to a tab. It is understandable that the connection between the main body 135 and the electrode tab can be welding, abutting, or contact.

[0069] In this embodiment, the current flow area between the current collector 10 and the electrode tab can be increased by the above-mentioned limitations, so as to improve the current flow capacity of the current collector 10.

[0070] Please see Figure 3 In some embodiments, the disc body 11 is provided with a pressure relief port 117, which is connected to the opening 119. In this way, the pressure relief area on the disc body 11 can be increased through the opening 119, so as to improve the smoothness and speed of fluid passing through the disc body 11 when the battery cell 1000 is depressurized.

[0071] It is understandable that the pressure relief port 117 is used for the passage of high-pressure fluid inside the battery cell 1000, so that the fluid can quickly flow into the explosion-proof valve 106 of the battery cell 1000, so that the explosion-proof valve 106 can open quickly to release air and pressure, ensuring the reliability of the battery cell 1000.

[0072] It is understood that, when projected onto a plane parallel to the disc body 11, at least a portion of the explosion-proof valve 106 coincides with the pressure relief port 117.

[0073] Please see Figure 3 In some embodiments, when the collector plate 10 is in the unfolded state, the opening 119 is located on the side of the plate body 11 away from the tail 12, and the end of the flow-through component 13 near the tail 12 is connected to the collector plate 10. This improves the structural symmetry of the plate body 11, making the collector plate 10 more uniformly stressed, thereby improving the stress state of the collector plate 10 and enhancing its reliability.

[0074] Please see Figure 3 In some embodiments, the tail portion 12 includes a first sub-portion 121 and a second sub-portion 122. The second sub-portion 122 connects the first sub-portion 121 and the disk body 11. When the collector disk 10 is in a bent state, the second sub-portion 122 is folded between the first sub-portion 121 and the disk body 11. In this way, the elasticity of the collector disk 10 in the bent state can be increased, thereby increasing the compression of the collector disk 10, so that the collector disk 10 can maintain stable contact with the pole post 102 and the electrode assembly 300, thereby improving the reliability of the connection between the collector disk 10 and the pole post 102 and the electrode assembly 300.

[0075] It is understandable that the bending direction between the second sub-part 122 and the disk body 11 is opposite to the bending direction between the second sub-part 122 and the first sub-part 121.

[0076] In addition, the above settings can also make the current collector 10 have a longer length in the unfolded state, so as to reduce the mutual interference between the welding of the current collector 10 and the electrode post 102 and the welding of the current collector 10 and the electrode assembly 300, thereby improving the reliability of the cell 1000.

[0077] Please see Figures 3 to 5 In some embodiments, the disc body 11 protrudes outward on the side opposite to the protrusion 134 to form a protruding tab welding area 115 on the side of the disc body 11 opposite to the protrusion 134, and a recess 116 is formed on the side of the disc body 11 near the protrusion 134. This allows for a gap between the disc body 11 and the electrode assembly 300, facilitating electrolyte flow and improving the wetting efficiency of the electrode assembly 300.

[0078] Please see Figure 3In some embodiments, a through groove 118 is provided at the bending portion of the collector plate 10. The through groove 118 extends along the center line of the bend, and when the collector plate 10 is in a bent state, the through groove 118 is located on the concave surface of the collector plate 10. In this way, the resistance of the material used to form the concave surface of the collector plate 10 to bending can be reduced, thereby improving the smoothness of bending of the collector plate 10.

[0079] Specifically, the through groove 118 is provided at the connection between the second sub-part 122 and the disk body 11, and at the connection between the second sub-part 122 and the first sub-part 121. The through groove 118 at the connection between the second sub-part 122 and the disk body 11 is located on the side of the disk body 11 closer to the flow-through member 13, while the through groove 118 between the second sub-part 122 and the first sub-part 121 is located on the side of the second sub-part 122 away from the flow-through member 13.

[0080] Please see Figure 7 In some embodiments, the collector plate 10 further includes a connector 14. One end of the connector 14 is connected to the end of the flow-through member 13 away from the center of the plate body 11, and the other end is configured to connect to the portion of the tail 12 near the opening 119 when the collector plate 10 is in a bent state. In this way, the flow-through area between the plate body 11 and the tail 12 can be increased, thereby improving the flow-through capacity of the collector plate 10.

[0081] It is understandable that the connection between the connector 14 and the part of the tail 12 near the opening 119 can be welding, snap-fitting, contact, etc.

[0082] Please see Figure 7 In some embodiments, the tail portion 12 includes a first sub-portion 121 and a second sub-portion 122. The second sub-portion 122 connects the first sub-portion 121 and the disk body 11. When the collector disk 10 is in a bent state, the second sub-portion 122 folds between the first sub-portion 121 and the disk body 11. A bend 125 is formed between the first sub-portion 121 and the second sub-portion 122. The connector 14 is configured to engage with the bend 125 when the collector disk 10 is in a bent state. This achieves a connection between the connector 14 and the portion of the tail portion 12 near the opening 119, while also ensuring a simple and reliable connection structure between the connector 14 and the tail portion 12.

[0083] In addition, by fastening the connector 14 to the bend 125, the compressive force between the protrusion 134 and the tail 12 can be increased based on the fastening, so that the flow between the protrusion 134 and the tail 12 is stable and reliable.

[0084] Please see Figure 8In some embodiments, a slot 123 is provided at the tail 12. When the collector plate 10 is bent, the protrusion 134 is inserted into the slot 123 and contacts the inner wall of the slot 123. In this way, the contact area between the flow-through component 13 and the tail 12 can be increased to improve the flow capacity between them. Also, the interference fit between the flow-through component 13 and the slot 123 can prevent the plate body 11 from springing back relative to the tail 12 after the collector plate 10 is bent, thereby improving the stability of the collector plate 10 in the bent state.

[0085] Specifically, the protrusion 134 extends into the slot 123 and is interference-fitted with the slot 123, and the end of the protrusion 134 away from the disc body 11 contacts the bottom surface of the slot 123.

[0086] Specifically, the card slot 123 is located in the second sub-part 122.

[0087] Specifically, a protrusion 124 is provided on the side of the second sub-part 122 opposite to the slot 123, and the protrusion 124 and the slot 123 are correspondingly arranged along the thickness direction of the second sub-part 122. When the collector plate 10 is in a bent state, the protrusion 124 contacts the first sub-part 121. In this way, the flow area between the first sub-part 121 and the second sub-part 122 can be increased, thereby improving the flow capacity of the collector plate 10.

[0088] For example, the bottom of the slot 123 is disposed within the protrusion 124, thereby increasing the depth of the slot 123 and increasing the mating area between the slot 123 and the protrusion 134, thereby increasing the contact area between the flow member 13 and the tail 12, which helps to improve the flow capacity between them.

[0089] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0090] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0091] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A collector disk (10), characterized in that, include: The disc body (11) has an opening (119) on its edge; The tail (12) is connected at one end to one end of the disc body (11); as well as A flow passage (13) is disposed in the opening (119), and a portion of the periphery of the flow passage (13) is connected to the disk body (11). The flow passage (13) has a protrusion (134) protruding in a direction perpendicular to the disk body (11). The protrusion (134) is configured to contact the tail (12) when the collector plate (10) is bent.

2. The collector disk (10) according to claim 1, characterized in that, The flow-through component (13) has a groove (112) on the side away from the protrusion (134). The groove (112) is correspondingly provided to the protrusion (134), and the end of the groove (112) away from the slot is provided inside the protrusion (134).

3. The collector disk (10) according to claim 2, characterized in that, The flow passage (13) is bent to form the protrusion (134) on one side of the flow passage (13) and the groove (112) on the other side of the flow passage (13).

4. The collector disk (10) according to claim 1, characterized in that, The tail (12) has a width dimension W1, and in the direction of the width dimension W1 of the tail (12), the protrusion (134) has a width dimension W2, satisfying: 0 < W2 ≤ 70% W1.

5. The collector disk (10) according to claim 4, characterized in that, 30% W1≤W2≤45% W1.

6. The collector disk (10) according to any one of claims 1-5, characterized in that, The thickness of the flow-through component (13) is less than the thickness of the disk body (11).

7. The collector disk (10) according to any one of claims 1-5, characterized in that, When the collector plate (10) is in the unfolded state, the distance between the surface of the protrusion (134) away from the plate body (11) and the plate body (11) is E. When the collector plate (10) is in the bent state, the distance between the opposite surfaces of the plate body (11) and the tail (12) is e, satisfying: 1e<E≤3e.

8. The collector disk (10) according to any one of claims 1-5, characterized in that, The flow-through component (13) includes a main body (135) and a protrusion (134). The main body (135) is disposed in the opening (119), and one end of the main body (135) is connected to the disk body (11). The protrusion (134) is connected to the main body (135). The main body (135) is configured to be connected to the electrode tab.

9. The collector disk (10) according to any one of claims 1-5, characterized in that, The disc body (11) is provided with a pressure relief port (117), which is connected to the opening (119).

10. The collector disk (10) according to any one of claims 1-5, characterized in that, When the collector plate (10) is in the unfolded state, the opening (119) is located on the side of the plate body (11) away from the tail (12), and the end of the flow-through component (13) near the tail (12) is connected to the collector plate (10).

11. The collector disk (10) according to any one of claims 1-5, characterized in that, The tail portion (12) includes a first sub-part (121) and a second sub-part (122), the second sub-part (122) connecting the first sub-part (121) and the disc body (11); When the collector plate (10) is in a bent state, the second sub-part (122) is folded between the first sub-part (121) and the plate body (11).

12. The collector disk (10) according to any one of claims 1-5, characterized in that, The disc body (11) protrudes outward on the side away from the protrusion (134) to form a protruding tab welding area (115) on the side of the disc body (11) away from the protrusion (134), and a recess (116) is formed on the side of the disc body (11) close to the protrusion (134). And / or, a through groove (118) is provided at the bent part of the collector plate (10), the through groove (118) extends along the center line of the bend, and the through groove (118) is located on the concave surface of the collector plate (10) when the collector plate (10) is in a bent state.

13. The collector disk (10) according to any one of claims 1-5, characterized in that, The collector plate (10) also includes a connector (14), one end of which is connected to the end of the flow member (13) away from the center of the plate body (11), and the other end is configured to be connected to the part of the tail (12) near the opening (119) when the collector plate (10) is in a bent state.

14. The collector disk (10) according to claim 13, characterized in that, The tail portion (12) includes a first sub-part (121) and a second sub-part (122), the second sub-part (122) connecting the first sub-part (121) and the disk body (11); when the collector disk (10) is in a bent state, the second sub-part (122) is folded between the first sub-part (121) and the disk body (11), and a bent portion (125) is formed between the first sub-part (121) and the second sub-part (122); The connector (14) is configured to engage with the bent portion (125) when the collector plate (10) is in a bent state.

15. The collector disk (10) according to any one of claims 1-5, characterized in that, A slot (123) is provided at the tail (12). When the collector plate (10) is bent, the protrusion (134) is inserted into the slot (123) and contacts the inner wall of the slot (123).

16. A cover plate assembly (100), characterized in that, include: Cover plate (101); The pole post (102) is inserted through the cover plate (101); The collector plate (10) as described in any one of claims 1-15, wherein the tail portion (12) at one end away from the plate body (11) is connected to the pole post (102); and The lower plastic part (103) is disposed between the cover plate (101) and the manifold (10).

17. A battery cell (1000), characterized in that, include: Casing (200); An electrode assembly (300) is disposed within the housing (200); as well as The cover plate assembly (100) as claimed in claim 16, wherein the cover plate (101) covers the housing (200), the disk (11) is connected to the electrode assembly (300), and the collector disk (10) is folded between the electrode assembly (300) and the cover plate (101).

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