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 disc body is provided with a winding core positioning hole; one end of the tail part is connected with one end of the disc body; the flow passing piece is connected with the disc body and is arranged close to the winding core positioning hole and extends along the circumference of the winding core positioning hole; the flow passing piece is configured to be in contact with the tail part when the current collecting disc is in a bent state. According to 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, the current collecting disc can pass current not only through the connecting part between the disc body and the tail part but also through the flow passing piece, thereby the current passing area between the disc body and the tail part can be increased, 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, in a first aspect, embodiments of this application provide a current collector, which includes a body, a tail, and a current-carrying element. The body has a core positioning hole; one end of the tail is connected to one end of the body; the current-carrying element is connected to the body and disposed near the core positioning hole, extending circumferentially along the core positioning hole; wherein the current-carrying element is configured to contact the tail when the current collector is bent. This allows the current collector to carry current not only through the connection between the body and the tail, but also through the current-carrying element, thereby increasing the current-carrying area between the body and the tail, thus improving the current-carrying capacity of the current collector and consequently improving the current-carrying capacity of the battery cell.

[0006] Optionally, the flow-through component extends in a ring shape along the circumference of the core positioning hole. This increases the flow area between the disc body and the tail, and also improves the structural symmetry of the collector disc, thereby improving the uniformity of stress on the collector disc.

[0007] Optionally, when the collector plate is in a bent state, the distance between the opposing surfaces of the plate body and the tail is e; when the collector plate is in an unfolded state, the height of the flow-through component is E, satisfying: e < E ≤ 3e. Thus, after the collector plate is folded, the flow-through component is clamped between the tail and the plate body. That is, the flow-through component has an interference fit with the gap between the tail and the plate body in the height direction, thereby providing a supporting force against the tail and maintaining stable contact between the flow-through component and the tail, thus improving the reliability of the flow between the flow-through component and the tail.

[0008] Optionally, the inner diameter of the flow-through component is not less than the diameter of the core positioning hole. This avoids the flow-through component's arrangement affecting the positioning fit between the core positioning hole and the electrode assembly, thereby improving the ease of operation and efficiency of connecting the current collector and the electrode assembly.

[0009] Optionally, a groove is provided on the side of the disk body away from the current-carrying element. The groove is positioned opposite to the current-carrying element, and the end of the groove away from the slot opening is located inside the current-carrying element. In this way, the current-carrying element can have a larger contact area with the tail end, and the material used in the current-carrying element can be reduced to reduce the weight of the current-carrying disk, thereby helping to improve the energy density of the battery cell.

[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, the flow-through component and the disk body are integrated. This reduces the number of connection points on the collector disk, thereby reducing stress concentration at the connection points between the flow-through component and the disk body, and thus improving the reliability of the connection between the flow-through component and the disk body.

[0012] 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.

[0013] Optionally, a through groove is provided at the connection between the first sub-part and the second sub-part. The through groove extends along the bending center line between the first and second sub-parts, and when the manifold is bent, the through groove is located on the concave surface between the first and second sub-parts. In this way, when bending between the first and second sub-parts, the through groove can reduce the material resistance of the formed concave surface to the bending, thereby improving the smoothness of the manifold bending.

[0014] Optionally, a through groove is provided at the connection between the tail and the disc body. The through groove extends along the bending center line between the tail and the disc body, and when the collector disc is bent, the through groove is located on the concave surface between the tail and the disc body. In this way, when bending between the tail and the disc body, the through groove can reduce the material resistance of the formed concave surface to bending, thereby improving the smoothness of the collector disc bending.

[0015] Optionally, the disc body protrudes outward on the side opposite to the current-flowing component, forming a protruding tab welding area on that side, and a recess is formed on the side of the disc body closer to the current-flowing component. This creates a gap between the disc body and the electrode assembly, facilitating electrolyte flow and improving the wetting efficiency of the electrode assembly.

[0016] Optionally, there are two tab welding areas; wherein the two tab welding areas are symmetrically distributed about the core positioning hole; and / or, when the current collector is in the unfolded state, the current collector has a length direction, and the two tab welding areas are located on both sides of the length direction. In this way, the structural symmetry of the current collector can be improved, which is conducive to improving the uniformity of stress on the current collector, thereby improving the reliability of the cell.

[0017] Optionally, a pressure relief vent is provided on the edge of the panel. This allows the high-pressure fluid inside the cell to quickly flow into the cell's explosion-proof valve through the pressure relief vent, causing the explosion-proof valve to open rapidly for venting and pressure relief, thus ensuring the reliability of the cell.

[0018] Optionally, there are multiple flow-through components, which are arranged sequentially outward along the radial direction of the disk body. This increases the flow-through area between the disk body and the tail section, thereby improving the flow-through capacity of the collector disk.

[0019] 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.

[0020] 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.

[0021] The beneficial effects of the embodiments of this application are as follows: In the embodiments of this application, by setting a current-carrying element and making it contact the tail end when the current collector is bent, the current-carrying element can be arranged using the bending gap of the current collector in the bent state to control the height of the current collector in the bent state and avoid affecting the height of the battery cell. Furthermore, the current-carrying element can carry current not only through the connection between the current collector and the tail end, but also through the contact between the current-carrying element and the tail end. This not only increases the current-carrying area between the current collector 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 current collector and the tail end and flow directly through the current-carrying element, shortening the current-carrying path between the current collector 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 thus improving the current-carrying capacity and charging / discharging efficiency of the battery cell.

[0022] 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.

[0023] 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.

[0024] 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 cross-sectional view of the manifold in its deployed state, provided in an embodiment of this application; 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 outlet; 118-Through groove; 12 - Tail; 121 - First sub-section; 122 - Second sub-section; 13-Flow-through components. Detailed Implementation

[0025] 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.

[0026] 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, 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 indicated technical features. Thus, features defined with "first" and "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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The following combination Figures 1 to 5 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.

[0033] 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.

[0034] Understandably, the housing 200 is also used to store electrode liquid.

[0035] 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.

[0036] 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.

[0037] 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 tab of the electrode assembly 300. The lower plastic component 103 is disposed between the cover plate 101 and the collector plate 10; specifically, the lower plastic component 103 is located between the end of the collector plate 10 connected to the electrode post 102 and the cover plate 101.

[0038] 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.

[0039] 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.

[0040] It is understood that the lower plastic component 103 is used to insulate the cover plate 101 from the internal conductive components of the battery cell 1000. Specifically, the lower plastic component 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 component 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.

[0041] Please see Figure 3 and Figure 4 This application provides a collector tray 10. The collector tray 10 includes a tray body 11, a tail portion 12, and a flow-through component 13. The tray body 11 has a core positioning hole 111. One end of the tail portion 12 is connected to one end of the tray body 11. The flow-through component 13 is connected to the tray body 11 and is disposed near the core positioning hole 111. The flow-through component 13 extends circumferentially along the core positioning hole 111. The flow-through component 13 is configured to contact the tail portion 12 when the collector tray 10 is in a bent state.

[0042] 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.

[0043] 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.

[0044] 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).

[0045] 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.

[0046] 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.

[0047] 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 battery cell 1000 during charging and discharging, which helps to improve the charging and discharging efficiency of the battery cell 1000, enabling the current collector 10 to withstand high power and high current operating conditions.

[0048] In addition, by placing the flow-through component 13 near the core positioning hole 111, the portion of the disc body 11 near the core positioning hole 111 can be connected to the flow-through component 13. This avoids the flow-through component 13 affecting the area of ​​the disc body 11 used for welding with the electrode tab, thereby ensuring the ease of operation and reliability of welding between the disc body 11 and the electrode tab.

[0049] Furthermore, by placing the flow passage 13 close to the core positioning hole 111, the structure of the flow collector 10 can be made more symmetrical, which is conducive to improving the uniformity of the force on the flow collector 10 and thus improving the structural reliability of the flow collector 10.

[0050] 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.

[0051] Please see Figure 3 In some embodiments, the flow-through element 13 extends in a ring shape along the circumference of the core positioning hole 111. This increases the flow-through area between the disk body 11 and the tail 12, and also improves the structural symmetry of the collector disk 10, thereby improving the uniformity of the force distribution on the collector disk 10.

[0052] It is understandable that the shape of the projection of the flow-through component 13 onto the plane of the disk body 11 is not limited to a circle, but can also be an ellipse, a polygon, etc.

[0053] For example, the flow-through component 13 is a ring structure, and its projection onto the plane of the disk body 11 is circular.

[0054] Please see Figure 4 and Figure 5 In some embodiments, when the collector plate 10 is in a bent state, the distance between the opposite surfaces of the plate body 11 and the tail 12 is e, and when the collector plate 10 is in an unfolded state, the height of the flow passage 13 is E, satisfying: e < E ≤ 3e.

[0055] 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.

[0056] For example, 1.05e≤E≤1.2e.

[0057] In this embodiment, by means of the above-mentioned limitations, after the collector plate 10 is folded, the flow-through component 13 is clamped between the tail 12 and the plate body 11. That is, the flow-through component 13 is interference-fitted with the gap between the tail 12 and the plate body 11 in the height direction, so that the flow-through component 13 has a supporting force on the tail 12, so that the flow-through component 13 and the tail 12 maintain stable contact, thereby improving the reliability of the flow between the flow-through component 13 and the tail 12.

[0058] Please see Figure 5 In some embodiments, the inner diameter of the flow-through element 13 is not less than the diameter of the core positioning hole 111. In this way, the arrangement of the flow-through element 13 can be avoided from affecting the positioning fit between the core positioning hole 111 and the electrode assembly 300, so as to improve the ease of operation and efficiency of connecting the collector plate 10 and the electrode assembly 300.

[0059] Please see Figure 5 In some embodiments, a groove 112 is provided on the side of the disk 11 facing away from the current-carrying element 13. The groove 112 is disposed opposite to the current-carrying element 13, and the end of the groove 112 away from the slot opening is disposed inside the current-carrying element 13. In this way, the current-carrying element 13 can have a larger contact area with the tail 12, and the material used in the current-carrying element 13 can be reduced to reduce the weight of the current collector disk 10, thereby helping to improve the energy density of the battery cell 1000.

[0060] 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.

[0061] 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.

[0062] Please see Figure 5 In some embodiments, the flow-through element 13 is integrally formed with the disk body 11. This reduces the number of connection points of the collector disk 10, thereby reducing stress concentration at the connection between the flow-through element 13 and the disk body 11, which helps to improve the reliability of the connection between the flow-through element 13 and the disk body 11.

[0063] For example, the flow element 13 is formed by partial stamping of the disc body 11.

[0064] Please see Figure 3 and Figure 4In 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. This increases the elasticity of the collector disk 10 in the bent state, thereby increasing the compression of the collector disk 10, allowing it to maintain stable contact with the electrode post 102 and the electrode assembly 300, thus improving the reliability of the connection between the collector disk 10 and the electrode post 102 and the electrode assembly 300.

[0065] 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.

[0066] 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.

[0067] Please see Figure 3 In some embodiments, a through groove 118 is provided at the connection between the first sub-part 121 and the second sub-part 122. The through groove 118 extends along the bending center line between the first sub-part 121 and the second sub-part 122. When the collector plate 10 is in a bent state, the through groove 118 is located on the concave surface between the first sub-part 121 and the second sub-part 122. Thus, when bending between the first sub-part 121 and the second sub-part 122, the through groove 118 can reduce the resistance of the material forming the concave surface to bending, thereby improving the smoothness of bending of the collector plate 10.

[0068] Specifically, the through groove 118 between the second sub-part 122 and the disc body 11 is located on the side of the disc body 11 closer to the flow member 13, and 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 member 13.

[0069] It can be understood that the collector plate 10, when in its unfolded state, has a length direction and a width direction perpendicular to the length direction, and the bending center line is parallel to the width direction.

[0070] Please see Figure 3In some embodiments, a through groove 118 is provided at the connection between the tail portion 12 and the disk body 11. The through groove 118 extends along the bending center line between the tail portion 12 and the disk body 11, and when the collector disk 10 is in a bent state, the through groove 118 is located on the concave surface between the tail portion 12 and the disk body 11. In this way, when bending between the tail portion 12 and the disk body 11, the through groove 118 can reduce the resistance of the material of the formed concave surface to bending, thereby improving the smoothness of bending of the collector disk 10.

[0071] Please see Figure 3 and Figure 5 In some embodiments, the disc 11 protrudes outward on the side opposite to the flow element 13 to form a protruding tab welding area 115 on the side of the disc 11 opposite to the flow element 13, and a recess 116 is formed on the side of the disc 11 close to the flow element 13. This creates a gap between the disc 11 and the electrode assembly 300 to facilitate electrolyte flow and improve the wetting efficiency of the electrode assembly 300.

[0072] Please see Figure 3 In some embodiments, there are two tab welding areas 115. The two tab welding areas 115 are symmetrically distributed about the core positioning hole 111. In this way, the structural symmetry of the current collector 10 can be improved, which helps to improve the uniformity of the force on the current collector 10, thereby improving the reliability of the cell 1000.

[0073] Please see Figure 3 In some embodiments, there are two tab welding areas 115. When the current collector 10 is in the unfolded state, the current collector 10 has a length direction, and the two tab welding areas 115 are located on both sides of the length direction. In this way, the structural symmetry of the current collector 10 can be improved, which is conducive to improving the uniformity of stress on the current collector 10, thereby improving the reliability of the battery cell 1000.

[0074] Please see Figure 3 In some embodiments, the edge of the disc body 11 is provided with a pressure relief port 117. In this way, the high-pressure fluid in the battery cell 1000 can quickly flow into the explosion-proof valve 106 of the battery cell 1000 through the pressure relief port 117, so that the explosion-proof valve 106 can be opened quickly to release air and pressure, and ensure the reliability of the battery cell 1000.

[0075] 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.

[0076] In some embodiments, there are multiple flow-through elements 13, which are arranged sequentially outward along the radial direction of the disk body 11. This increases the flow-through area between the disk body 11 and the tail 12, thereby improving the flow-through capacity of the collector disk 10.

[0077] 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.

[0078] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0079] 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 a core positioning hole (111); The tail (12) is connected at one end to one end of the disc body (11); as well as A flow-through component (13) is connected to the disc body (11) and is disposed near the core positioning hole (111). The flow-through component (13) extends circumferentially along the core positioning hole (111). The flow-through component (13) is configured to contact the tail (12) when the flow collector (10) is in a bent state.

2. The collector disk (10) according to claim 1, characterized in that, The flow-through element (13) extends in a ring shape along the circumference of the core positioning hole (111).

3. The collector disk (10) according to claim 1, characterized in that, When the collector plate (10) is in a bent state, the distance between the opposite surfaces of the plate body (11) and the tail (12) is e. When the collector plate (10) is in an unfolded state, the height of the flow passage (13) is E, satisfying: e < E ≤ 3e.

4. The collector disk (10) according to claim 1, characterized in that, The inner diameter of the flow-through component (13) is not less than the diameter of the core positioning hole (111).

5. The collector disk (10) according to any one of claims 1-4, characterized in that, A groove (112) is provided on the side of the disk body (11) away from the flow-through component (13). The groove (112) is disposed opposite to the flow-through component (13), and the end of the groove (112) away from the slot is disposed inside the flow-through component (13).

6. The collector disk (10) according to claim 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 claim 5, characterized in that, The flow-through component (13) is integrally formed with the disk body (11).

8. The collector disk (10) according to any one of claims 1-4, 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).

9. The collector disk (10) according to claim 8, characterized in that, A through groove (118) is provided at the connection between the first sub-part (121) and the second sub-part (122). The through groove (118) extends along the bending center line between the first sub-part (121) and the second sub-part (122), and when the collector plate (10) is in a bent state, the through groove (118) is located on the concave surface between the first sub-part (121) and the second sub-part (122).

10. The collector disk (10) according to any one of claims 1-4, characterized in that, A through groove (118) is provided at the connection between the tail (12) and the disk (11). The through groove (118) extends along the bending center line between the tail (12) and the disk (11), and when the collector disk (10) is bent, the through groove (118) is located on the concave surface between the tail (12) and the disk (11).

11. The collector disk (10) according to any one of claims 1-4, characterized in that, The disc body (11) protrudes outward on the side away from the flow member (13) to form a protruding tab welding area (115) on the side of the disc body (11) away from the flow member (13), and a recess (116) is formed on the side of the disc body (11) close to the flow member (13).

12. The collector disk (10) according to claim 11, characterized in that, There are two electrode welding areas (115); The two electrode welding areas (115) are symmetrically distributed about the core positioning hole (111); And / or, when the collector plate (10) is in the unfolded state, the collector plate (10) has a length direction, and the two electrode welding areas (115) are respectively located on both sides of the length direction.

13. The collector disk (10) according to any one of claims 1-4, characterized in that, The edge of the disc (11) is provided with a pressure relief port (117).

14. The collector disk (10) according to any one of claims 1-4, characterized in that, There are multiple flow passage elements (13), and the multiple flow passage elements (13) are arranged sequentially outward along the radial direction of the disk body (11).

15. 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 1-14, 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).

16. 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 15, 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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