Conductive member, cover plate assembly, and battery cell

Abstract

The application provides a conductive piece, a cover plate assembly and a battery cell. The conductive piece comprises a current collector and a protrusion. The current collector has a first through hole. The protrusion is arranged on one side of the current collector and covers one end of the first through hole. The protrusion has a first side wall in the circumferential direction. The first side wall is provided with a second through hole. The second through hole is in communication with the first through hole. The application can limit the tab by the protrusion, improve the position stability of the tab bent on the end of the electrode assembly, improve the tab lifting condition, and make the second through hole located on the side wall with an included angle between the protrusion and the end face of the electrode assembly. Therefore, when the tab is lifted, the contact area between the tab and the second through hole can be reduced, the coverage of the lifted tab on the second through hole can be reduced, and the lifted tab can be prevented from blocking the second through hole. In this way, the smoothness of the pressure relief channel of the battery cell can be ensured, the smoothness of the exhaust pressure relief of the battery cell can be improved, and the reliability of the battery cell can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a conductive component, a cover plate assembly, and a battery cell. Background Technology

[0002] In related technologies, a battery cell includes a housing, an electrode assembly disposed within the housing, and a cover assembly that seals the opening of the housing. The cover assembly includes a cover plate that covers the housing, a conductive element mounted on the cover plate, and an insulating element that insulates the conductive element from the cover plate. One end of the conductive element is located inside the housing and connected to the tab of the electrode assembly; the other end of the conductive element is located outside the housing and connected to components such as connectors. To reduce the space occupied by the tab, the tab is bent and positioned at the end of the electrode assembly. Simultaneously, to improve the reliability of the battery cell, an explosion-proof valve is installed on the cover plate. When the internal pressure of the battery cell reaches a threshold, the explosion-proof valve opens to release pressure. Because the tab is made of foil, which is thin and flexible, when the internal pressure of the battery cell abnormally increases and pressure is released, the tab is prone to warping against the cover plate and blocking the pressure release channel, hindering the battery cell's pressure release and thus reducing its reliability. Utility Model Content

[0003] Embodiments of this application provide a conductive element, a cover plate assembly, and a battery cell, which can improve the reliability of the battery cell.

[0004] In a first aspect, embodiments of this application provide a conductive component, which includes a current collector and a protrusion. The current collector has a first through hole. The protrusion is disposed on one side of the current collector and covers one end of the first through hole. The protrusion has a first sidewall along its circumference, and a second through hole is disposed on the first sidewall, the second through hole communicating with the first through hole. This not only limits the tab by the protrusion, improving the positional stability of the tab bent at the end of the electrode assembly and mitigating tab warping, but also ensures that the second through hole is located on the sidewall where the protrusion forms an angle with the end face of the electrode assembly. Therefore, when the tab warps, the contact area between the tab and the second through hole is reduced, thus reducing the coverage of the second through hole by the warped tab and effectively preventing the warped tab from blocking the second through hole. This helps ensure the unobstructed pressure relief channel of the battery cell, improving the smoothness of pressure relief and thus enhancing the reliability of the battery cell.

[0005] In some embodiments, there are multiple second through holes, which are spaced apart along the connection line between the first sidewall and the current collector. Thus, providing multiple second through holes increases the area of ​​the air inlet of the cell's pressure relief channel, allowing high-pressure gas inside the cell to be introduced into the air inlet of the explosion-proof valve more quickly. This improves the efficiency of the explosion-proof valve in responding to air pressure to vent gas, thereby enhancing the reliability of the cell.

[0006] In some embodiments, a groove is provided on the side of the protrusion facing the first through hole, and multiple second through holes are connected to the first through hole through the groove. Thus, the connection structure between the second through holes and the first through hole can be simplified by providing the groove, thereby improving the forming efficiency of the conductive component.

[0007] In some embodiments, there are two first sidewalls, located on opposite sides of the protrusion, and each first sidewall has a second through hole. This increases the area of ​​the air inlet of the cell's pressure relief channel, thereby improving the efficiency of the explosion-proof valve in responding to air pressure for venting, and also enhances the structural symmetry of the protrusion, thus improving the stress state of the conductive components.

[0008] In some embodiments, along the axial direction of the first through hole, the bump has a height dimension H1 that satisfies: 1mm ≤ H1 ≤ 3mm. This avoids the bump height dimension H1 being too large, which would occupy too much space inside the battery cell, thus ensuring the energy density of the battery cell. It also avoids the bump height dimension H1 being too small, which would be detrimental to the forming of the second through hole, thereby reducing the forming difficulty of the conductive component and improving the forming efficiency.

[0009] In some embodiments, the protrusion is a strip-shaped structure, with the first sidewall extending radially along the current collector. This allows the second through-hole to be arranged radially, increasing the number of layers the second through-hole covers when the electrode assembly is wound. This allows gas inside the cell to enter the second through-hole more quickly, improving the efficiency of the explosion-proof valve in responding to gas pressure for venting.

[0010] In some embodiments, the surface of the bump facing away from the collector has a width dimension W1, satisfying: 2mm≤W1≤3mm. This ensures that the bump has a sufficient width dimension W1 to facilitate the smooth flow of air when switching between the second through-hole and the first through-hole, thereby improving the smoothness of airflow, while also preventing the width dimension W1 of the bump from being too large and affecting the arrangement of other components and structures.

[0011] In some embodiments, the current collector has multiple first through holes and multiple protrusions, with each protrusion corresponding to one of the multiple first through holes; and / or, the protrusions are integrally formed with the current collector. This increases the contact area between the conductive element and the electrode tab, thereby improving the conductivity of the conductive element in limiting the electrode tab. It also reduces the number of connection points, avoiding stress concentration at these points and reducing the risk of breakage. Furthermore, the integral formation of the protrusions with the current collector improves manufacturing efficiency.

[0012] In some embodiments, a ring is provided on the side of the current collector facing away from the protrusion. The ring extends around the axis of the conductive element and is located on the side of the first through hole near the axis of the conductive element. In this way, the ring increases the compressive force of the current collector on the insulator located between the cover plate and the current collector, thereby improving the sealing performance between the current collector and the insulator at the ring, thus improving the reliability of the battery cell and preventing electrolyte leakage from the mating area between the current collector and the insulator.

[0013] In some embodiments, the conductive element further includes a terminal post, one end of which is connected to the surface of the current collector facing away from the protrusion, and the terminal post and the current collector are integrally formed. This reduces the number of connection points, avoids stress concentration at these points, and lowers the risk of breakage. Furthermore, the integral formation of the terminal post and the current collector improves manufacturing efficiency.

[0014] In some embodiments, the conductive element further includes a terminal, which is connected to the end of the electrode away from the current collector, and the terminal and electrode are integrally formed. This reduces the number of connection points, avoids stress concentration at these points, and lowers the risk of breakage. Furthermore, the integral formation of the terminal and electrode improves manufacturing efficiency.

[0015] In some embodiments, the outer diameter of the terminal is equal to the outer diameter of the pole post, and the terminal and pole post are coaxially arranged. Thus, the conductive element and the cover plate can be assembled through a simple insertion operation, thereby reducing the assembly difficulty of the cover plate assembly and improving its assembly efficiency.

[0016] Secondly, embodiments of this application provide a cover plate assembly, which includes a cover plate, an insulating component, a first sealing component, an explosion-proof valve, and the aforementioned conductive component. The cover plate is provided with a third through hole and a terminal hole. A current collector is located on one side of the cover plate, and a protrusion is located on the side of the current collector facing away from the cover plate. The first through hole and the third through hole are arranged opposite to each other. The insulating component is disposed between the cover plate and the current collector, and a fourth through hole is provided on the insulating component, which connects the third through hole and the second through hole. The first sealing component is disposed in the terminal hole to seal the cover plate and the terminal hole. The explosion-proof valve is disposed in the third through hole. In this way, it is beneficial to ensure the unobstructed flow of the pressure relief channel of the battery cell, thereby improving the smoothness of the battery cell's venting and pressure relief, and thus improving the reliability of the battery cell.

[0017] In some embodiments, the cover plate assembly further includes a second seal; a plurality of third through holes are provided on the cover plate, a plurality of first through holes are provided on the current collector, and a plurality of protrusions are provided, each corresponding one-to-one with a plurality of first through holes, and each first through hole corresponding one-to-one with a plurality of third through holes; wherein, some of the third through holes are provided with explosion-proof valves, and the remaining third through holes are provided with second seals. Thus, the required explosion-proof valve can be selected and installed on the cover plate according to the actual application environment of the battery cell, thereby improving the adjustability of the cover plate assembly and helping to reduce manufacturing costs.

[0018] In some embodiments, the second seal is a metal sheet, which is circumferentially welded into the corresponding third through hole. Thus, the contact portion between the metal sheet and the wall of the third through hole will undergo high-temperature melting to form a metallurgical bond, creating a weld. This reduces the gap between the second seal and the third through hole, improving the sealing performance between them and effectively preventing the penetration of media such as gases, liquids, and dust. It also prevents electrolyte leakage from the third through hole.

[0019] In some embodiments, the explosion-proof valve is a metal sheet with grooves on its surface, and the explosion-proof valve is circumferentially welded into the corresponding third through hole. In this way, the burst pressure and burst path of the explosion-proof valve can be precisely set by adjusting the structural parameters of the grooves, thereby improving the reliability of the battery cell.

[0020] In some embodiments, a stepped groove is provided on the wall of the third through hole, the stepped groove being located away from the manifold, and the periphery of the explosion-proof valve is located within the stepped groove. This allows for quick positioning and installation of the explosion-proof valve via the stepped groove, thereby improving the assembly efficiency of the cover plate assembly.

[0021] In some embodiments, the cover assembly further includes an insulating member disposed between the cover and the current collector. The insulating member has a fourth through hole that connects to the third through hole and the second through hole. The insulating member provides insulation between the cover and the current collector to improve the reliability of the battery cell.

[0022] In some embodiments, the first seal and the insulating element are integrally connected. This reduces the number of parts in the cover assembly and the number of assembly steps, thereby improving assembly efficiency.

[0023] 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 assembly is closed to the housing, and a protrusion facing away from the current collector surface is connected to the electrode assembly. This facilitates ensuring the unobstructed flow of the battery cell's pressure relief channel, thereby improving the smoothness of pressure relief and thus enhancing the battery cell's reliability.

[0024] The beneficial effects of the embodiments of this application are as follows:

[0025] In the embodiments of this application, by providing a protrusion on one side of the current collector and opening a hole on the side of the protrusion near the current collector, on the one hand, the protrusion can limit the tab, improving the positional stability of the tab bent at the end of the electrode assembly and improving the tab lifting situation; on the other hand, the second through hole is located on the side wall where the protrusion and the end face of the electrode assembly form an angle, thereby reducing the contact area between the tab and the second through hole when the tab lifts, thus reducing the coverage of the second through hole by the lifted tab, and effectively preventing the lifted tab from blocking the second through hole. This helps to ensure the unobstructed pressure relief channel of the battery cell, improving the smoothness of battery cell venting and pressure relief, thereby improving the reliability of the battery cell. Attached Figure Description

[0026] 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 accompanying 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.

[0027] Figure 1 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0028] Figure 2 This is a structural schematic diagram of the first cover plate assembly provided in the embodiments of this application;

[0029] Figure 3 This is a schematic diagram of the structure of a second cover plate assembly provided in an embodiment of this application;

[0030] Figure 4 yes Figure 2 Sectional view of AA;

[0031] Figure 5 This is a schematic diagram of the structure of the cover plate provided in an embodiment of this application;

[0032] Figure 6 yes Figure 5 Sectional view of BB;

[0033] Figure 7 This is a schematic diagram of the structure of the first conductive element provided in the embodiments of this application;

[0034] Figure 8 This is a schematic diagram of the structure of the first conductive element provided in the embodiments of this application from another perspective;

[0035] Figure 9 yes Figure 7 Sectional view of CC;

[0036] Figure 10 yes Figure 8Sectional view of DD;

[0037] Figure 11 This is a schematic diagram of the structure of the second conductive element provided in the embodiments of this application;

[0038] Figure 12 This is a schematic diagram of the structure of the second conductive element provided in the embodiments of this application from another perspective;

[0039] Figure 13 This is a schematic diagram of the structure of the third conductive element provided in the embodiments of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1000 - Cell; 200 - Housing; 300 - Electrode assembly;

[0042] 100 - Cover plate assembly; 20 - Cover plate; 21 - Pole post hole; 22 - Third through hole; 23 - Step groove;

[0043] 30 - Explosion-proof valve; 31 - Score; 40 - Insulating component; 41 - Fourth through hole; 50 - First seal; 60 - Second seal;

[0044] 10 - Conductive components;

[0045] 11-Current collector; 111-First through hole; 112-Ring body; 113-Connecting groove;

[0046] 12-Protrusion; 121-First sidewall; 122-Second through hole; 123-Groove;

[0047] 13-pole; 14-terminal. Detailed Implementation

[0048] 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 some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] 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.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of 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.

[0051] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0052] 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.

[0053] The following combination Figures 1 to 13 The present application provides a detailed description of a conductive element 10, a cover plate assembly 100, and a battery cell 1000 provided in the embodiments of this application.

[0054] Please see Figure 1 This application provides a battery cell 1000. The battery cell 1000 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 20 of the cover plate assembly 100 covers the housing 200. The protrusion 12 on the conductive element 10 of the cover plate assembly 100, facing away from the current collector 11, is connected to the electrode assembly 300.

[0055] Specifically, the protrusion 12 is welded to the electrode tab away from the surface of the current collector 11.

[0056] It is understood that the battery cell 1000 may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment is not limited to this. The battery cell 1000 may be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to this either. The battery cell 1000 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to this either.

[0057] For example, cell 1000 is a cylindrical cell 1000.

[0058] It is understandable that the casing 200 contains an electrolyte that provides a suitable environment for the electrochemical reaction.

[0059] The electrode assembly 300 includes a positive electrode sheet, a separator, and a negative electrode sheet stacked or stacked and wound sequentially. The electrode assembly 300 relies on the movement of metal ions between the positive and negative electrode sheets to output or store electrical energy. The positive electrode sheet 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 serves 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 current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the uncoated negative current collector serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can pass through without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0060] Please see Figures 2-4 The cover plate assembly 100 provided in the embodiments of this application includes a cover plate 20, an explosion-proof valve 30, and a conductive component 10. The cover plate 20 is provided with a third through hole 22, such as... Figure 5 and Figure 6 As shown. The manifold 11 is located on one side of the cover plate 20. The explosion-proof valve 30 is disposed in the third through hole 22, as shown. Figure 4 As shown.

[0061] Please refer to Figure 7 , Figure 8 and Figure 9 The conductive element 10 provided in the embodiments of this application includes a current collector 11 and a protrusion 12. The current collector 11 has a first through hole 111. The protrusion 12 is disposed on one side of the current collector 11 and covers one end of the first through hole 111. The protrusion 12 has a first sidewall 121 in the circumferential direction. A second through hole 122 is provided on the first sidewall 121. The second through hole 122 communicates with the first through hole 111. The protrusion 12 of the conductive element 10 is located on the side of the current collector 11 away from the cover plate 20. The first through hole 111 and the third through hole 22 are disposed opposite to each other.

[0062] It can be understood that the portion of the sidewall of the protrusion 12 near the collector 11 is the first sidewall 121. That is, the first sidewall 121 is located between the collector 11 and the surface of the protrusion 12 facing away from the collector 11.

[0063] For example, when the current collector 11 is applied to the cylindrical cell 1000, the current collector 11 is disc-shaped or fan-shaped.

[0064] It is understandable that the surface of the bump 12 facing away from the current collector 11 is configured to connect with the tab.

[0065] When the internal pressure of the battery cell 1000 increases, the gas inside the battery cell 1000 passes through the second through hole 122 and the first through hole 111 in sequence and enters the third through hole 22, where it comes into contact with the explosion-proof valve 30. When the internal pressure of the battery cell 1000 reaches the threshold of the explosion-proof valve 30, the explosion-proof valve 30 is opened, allowing the high-pressure gas flow inside the battery cell 1000 to be released and depressurized by passing through the second through hole 122, the first through hole 111, the third through hole 22, and the explosion-proof valve 30 in sequence.

[0066] In this embodiment, by providing a protrusion 12 on one side of the current collector 11 and opening a hole on the side of the protrusion 12 near the current collector 11, on the one hand, the protrusion 12 can limit the tab, improving the positional stability of the tab bent at the end of the electrode assembly 300 and improving the tab lifting situation. On the other hand, the second through hole 122 is located on the side wall where the protrusion 12 forms an angle with the end face of the electrode assembly 300, thereby reducing the contact area between the tab and the second through hole 122 when the tab lifts, thus reducing the coverage of the second through hole 122 by the lifted tab, and effectively preventing the lifted tab from blocking the second through hole 122. In this way, it is beneficial to ensure the unobstructed pressure relief channel of the battery cell 1000, thereby improving the smoothness of the pressure relief of the battery cell 1000 and thus improving the reliability of the battery cell 1000.

[0067] In addition, the current collector 11 of this conductive component 10 has no bending parts, which can reduce the space occupied by the current collector 11 in the battery cell 1000 and avoid poor cover closing and excessive core pressure caused by bending of the current collector 11.

[0068] It is understood that the cover plate 20 also includes an insulating element 40 and a first sealing element 50; the cover plate 20 is also provided with a pole post hole 21. The insulating element 40 is disposed between the cover plate 20 and the current collector 11 to insulate and isolate the current collector 11 and the cover plate 20. The insulating element 40 is provided with a fourth through hole 41, which connects to the third through hole 22 and the second through hole 122. The first sealing element 50 is disposed in the pole post hole 21 to seal the cover plate 20 and the pole post 13.

[0069] Please see Figure 7 and Figure 8 In some embodiments, there are multiple second through holes 122, which are spaced apart along the connection line between the first sidewall 121 and the current collector 11. Thus, providing multiple second through holes 122 increases the area of ​​the air inlet of the pressure relief channel of the battery cell 1000, allowing high-pressure gas inside the battery cell 1000 to be introduced into the air inlet of the explosion-proof valve 30 more quickly. This improves the efficiency of the explosion-proof valve 30 in responding to air pressure for venting, thereby enhancing the reliability of the battery cell 1000.

[0070] Please see Figure 9 In some embodiments, a groove 123 is provided on the side of the protrusion 12 facing the first through hole 111. Multiple second through holes 122 are connected to the first through hole 111 through the groove 123. Thus, the connection structure between the second through holes 122 and the first through hole 111 can be simplified by providing the groove 123, thereby improving the molding efficiency of the conductive component 10.

[0071] For example, a protrusion 12 may be formed on one side of the manifold 11, and a groove 123 and a first through hole 111 may be formed on the other side.

[0072] Please see Figure 10 In some embodiments, there are two first sidewalls 121. The two first sidewalls 121 are located on both sides of the protrusion 12. Each of the two first sidewalls 121 is provided with a second through hole 122. In this way, the area of ​​the air inlet of the pressure relief channel of the battery cell 1000 can be increased to improve the efficiency of the explosion-proof valve 30 in responding to air pressure to exhaust gas, and the structural symmetry of the protrusion 12 can be improved to facilitate the improvement of the stress state of the conductive component 10.

[0073] Please see Figure 10 In some embodiments, along the axial direction of the first through hole 111, the protrusion 12 has a height dimension H1 that satisfies: 1mm≤H1≤3mm.

[0074] It is understood that the height dimension H1 of the bump 12 includes, but is not limited to, 1.01mm, 1.05mm, 1.09mm, 1.13mm, 1.17mm, 1.21mm, 1.25mm, 1.29mm, 1.33mm, 1.37mm, 1.41mm, 1.45mm, 1.49mm, 1.53mm, 1.57mm, 1.61mm, 1.65mm, 1.69mm, 1.73mm, 1.77mm, 1.81mm, 1.85mm, 1.89mm, 1.93mm, 1.97mm, 2.02mm, 2.06mm, 2.1mm, 2.5mm, 2.9mm, and 3mm.

[0075] In this embodiment, by limiting the height dimension H1 of the bump 12, on the one hand, the height dimension H1 of the bump 12 can be avoided from being too large and occupying too much space inside the cell 1000, thereby ensuring the energy density of the cell 1000; on the other hand, the height dimension H1 of the bump 12 can be avoided from being too small and not conducive to the forming of the second through hole 122, thereby reducing the forming difficulty of the conductive component 10 and improving the forming efficiency.

[0076] Please see Figure 8In some embodiments, the protrusion 12 is a strip structure, and the first sidewall 121 extends radially along the collector 11.

[0077] It is understood that in the wound electrode assembly 300, gas is spirally discharged along the winding direction of the electrode assembly 300. Extending the protrusion 12 radially along the current collector 11 allows the second through hole 122 to be arranged radially, thereby increasing the number of layers of the wound electrode assembly 300 covered by the second through hole 122. This allows the gas inside the cell 1000 to enter the second through hole 122 more quickly, thereby improving the efficiency of the explosion-proof valve 30 in responding to gas pressure to exhaust gas.

[0078] Please see Figure 10 In some embodiments, the surface of the protrusion 12 facing away from the current collector 11 has a width dimension W1, which satisfies: 2mm≤W1≤3mm.

[0079] It is understood that the width dimension W1 includes, but is not limited to, 2mm, 2.03mm, 2.05mm, 2.07mm, 2.09mm, 2.11mm, 2.13mm, 2.15mm, 2.17mm, 2.19mm, 2.21mm, 2.23mm, 2.25mm, 2.27mm, 2.29mm, 2.31mm, 2.33mm, 2.35mm, 2.37mm, 2.39mm, 2.42mm, 2.45mm, 2.48mm, 2.51mm, 2.54mm, 2.57mm, 2.61mm, 2.65mm, 2.72mm, 2.85mm, and 3mm.

[0080] In this embodiment, by limiting the width dimension W1, on the one hand, it can be ensured that the protrusion 12 has a sufficient width dimension W1 to facilitate the smooth flow of air when the airflow changes direction between the second through hole 122 and the first through hole 111, thereby improving the smoothness of airflow. On the other hand, it can prevent the width dimension W1 of the protrusion 12 from being too large and affecting the setting of other components and structures.

[0081] Please see Figure 7 and Figure 8 In some embodiments, a plurality of first through holes 111 are provided on the current collector 11. There are multiple protrusions 12. Each of the multiple protrusions 12 corresponds one-to-one with a plurality of first through holes 111. In this way, the contact area between the conductive element 10 and the electrode tab can be increased, thereby improving the limiting effect of the conductive element 10 on the electrode tab.

[0082] For example, the first through hole 111 has five protrusions 12.

[0083] For example, a plurality of first through holes 111 are evenly spaced around the axis of the conductive element 10.

[0084] It is understood that at least one protrusion 12 is provided with a second through hole 122, such as Figure 6 and Figure 7 As shown, each protrusion 12 may also be provided with a second through hole 122, such as... Figure 11 and Figure 12 As shown, a second through hole 122 may also be provided on part of the protrusion 12.

[0085] For example, when each protrusion 12 is provided with a second through hole 122, a connecting groove 113 can be provided on the surface of the current collector 11 facing away from the protrusion 12. The connecting groove 113 connects two adjacent first through holes 111, such as... Figure 13 As shown. Thus, the various first through holes 111 can be connected via the connecting groove 113, allowing the explosion-proof valve 30 to have multiple air inlet ports when it is installed, thereby improving the reliability of the explosion-proof valve 30 when it is braked. Furthermore, with each through hole corresponding to one explosion-proof valve 30, the air inlet ports of each explosion-proof valve 30 can be connected, so that pressure relief can be performed when any one of the explosion-proof valves 30 is braked. This improves the reliability of the battery cell 1000.

[0086] In some embodiments, the bump 12 is integrally formed with the current collector 11. This reduces the number of connection points, avoids stress concentration at these points, and lowers the risk of breakage. Furthermore, the integral formation of the bump 12 with the current collector 11 improves manufacturing efficiency.

[0087] For example, a protrusion 12 may be formed on one side of the manifold 11, and a groove 123 and a first through hole 111 may be formed on the other side.

[0088] Please see Figure 7 and Figure 9 In some embodiments, a ring 112 is provided on the side of the current collector 11 opposite to the protrusion 12. The ring 112 extends around the axis of the conductive member 10, and the ring 112 is located on the side of the first through hole 111 near the axis of the conductive member 10. It is understood that the ring 112 abuts against the insulating member 40.

[0089] In this way, the pressure exerted by the current collector 11 on the insulating member 40 located between the cover plate 20 and the current collector 11 can be increased by the ring body 112, thereby improving the sealing performance between the current collector 11 and the insulating member 40 at the ring body 112, thereby improving the reliability of the battery cell 1000 and preventing electrolyte leakage from the mating part between the current collector 11 and the insulating member 40.

[0090] Furthermore, the arrangement of the ring 112 makes the contact surface between the conductive element 10 and the insulating element 40 at the ring 112 not planar, but multiple contact surfaces arranged at an angle, thereby increasing the resistance of the electrolyte flowing through the ring 112, so that the electrolyte leaks from the mating part between the current collector 11 and the insulating element 40.

[0091] Please see Figure 7 , Figure 11 and Figure 13 In some embodiments, the conductive element 10 further includes a terminal post 13. One end of the terminal post 13 is connected to the surface of the current collector 11 facing away from the protrusion 12. The terminal post 13 and the current collector 11 are integrally formed. This reduces the number of connection points, avoids stress concentration due to connection points, and reduces the risk of breakage. Furthermore, the integral formation of the terminal post 13 and the current collector 11 improves manufacturing efficiency and minimizes the internal resistance of the conductive element 10.

[0092] Please see Figure 7 , Figure 11 and Figure 13 In some embodiments, the conductive element 10 further includes a terminal 14, which is connected to the end of the electrode 13 away from the current collector 11. The terminal 14 and the electrode 13 are integrally formed. This reduces the number of connection points, avoids stress concentration at connection points, and reduces the risk of breakage. Furthermore, the integral formation of the terminal 14 and the electrode 13 improves manufacturing efficiency and minimizes the internal resistance of the conductive element 10.

[0093] Please see Figure 9 In some embodiments, the outer diameter of terminal 14 is equal to the outer diameter of pole post 13. Terminal 14 and pole post 13 are coaxially arranged. Thus, the conductive element 10 and cover plate 20 can be assembled by a simple insertion operation, thereby reducing the assembly difficulty of cover plate assembly 100 and improving the assembly efficiency of cover plate assembly 100.

[0094] Please see Figure 4 In some embodiments, the cover plate assembly 100 further includes a second sealing element 60. A plurality of third through holes 22 are provided on the cover plate 20. A plurality of first through holes 111 are provided on the manifold 11. There are multiple protrusions 12. Each of the multiple protrusions 12 corresponds one-to-one with a plurality of first through holes 111. Each of the multiple first through holes 111 corresponds one-to-one with a plurality of third through holes 22. Explosion-proof valves 30 are provided in some of the third through holes 22, while the second sealing elements 60 are provided in the remaining third through holes 22.

[0095] It is understood that at least one third through hole 22 is equipped with an explosion-proof valve 30, such as Figure 2 As shown. Alternatively, each third through hole 22 can be equipped with an explosion-proof valve 30, such as... Figure 3 As shown.

[0096] In this embodiment, through the above settings, the required explosion-proof valve 30 can be selected and installed on the cover plate 20 according to the actual application environment of the battery cell 1000, thereby improving the adjustability of the cover plate assembly 100 and reducing manufacturing costs.

[0097] In some embodiments, the second seal 60 is a metal sheet. The second seal 60 is circumferentially welded into the corresponding third through hole 22. Thus, the contact portion between the metal sheet and the hole wall of the third through hole 22 will be metallurgically bonded through high-temperature melting to form a weld, thereby reducing the gap between the second seal 60 and the third through hole 22, improving the sealing performance between them, effectively preventing the penetration of media such as gas, liquid, and dust, and also preventing electrolyte leakage from the third through hole 22.

[0098] Please see Figure 4 In some embodiments, the explosion-proof valve 30 is a metal sheet with grooves 31 on its surface, and the explosion-proof valve 30 is circumferentially welded into the corresponding third through hole 22. In this way, the rupture pressure and rupture path of the explosion-proof valve 30 can be precisely set by adjusting the structural parameters of the grooves 31 (such as the depth and shape of the grooves 31), thereby improving the reliability of the battery cell 1000.

[0099] Please see Figures 4 to 6 In some embodiments, a stepped groove 23 is provided on the wall of the third through hole 22, and the stepped groove 23 is located away from the manifold 11, with the periphery of the explosion-proof valve 30 located in the stepped groove 23. In this way, the explosion-proof valve 30 can be quickly positioned and installed through the stepped groove 23, which helps to improve the assembly efficiency of the cover plate assembly 100.

[0100] Please see Figure 4 In some embodiments, the cover plate assembly 100 further includes an insulating member 40 disposed between the cover plate 20 and the current collector 11. The insulating member 40 has a fourth through hole 41, which connects to the third through hole 22 and the second through hole 122. The insulating member 40 insulates and isolates the cover plate 20 and the current collector 11 to improve the reliability of the battery cell 1000.

[0101] For example, the insulating element 40 is a plastic part. It can be injection molded between the cover plate 20 and the conductive element 10.

[0102] Please see Figure 4 In some embodiments, the cover plate assembly 100 further includes a first sealing element 50. The cover plate 20 has a pole post hole 21. The first sealing element 50 is located within the pole post hole 21. The first sealing element 50 is used to seal the cover plate 20 and the pole post 13; wherein, the first sealing element 50 is integrally connected with the insulating element 40. It can be understood that the first sealing element 50 is circumferentially disposed between the pole post 13 and the pole post hole 21.

[0103] Please see Figure 4 In some embodiments, the first sealing element 50 and the insulating element 40 are integrated. This reduces the number of parts in the cover assembly 100 and the number of assembly steps, thereby improving assembly efficiency.

[0104] For example, after assembling the cover plate 20 and the conductive component 10, they are placed in an injection mold. The cover plate 20 and the current collector 11 are spaced apart to form the injection cavity of the insulating component 40. The walls of the pole post 13 and the pole post hole 21 are spaced apart to form the injection cavity of the first sealing component 50. After the mold is closed, molten plastic is injected into the two injection cavities. After the molten plastic has cured, the cover plate 20 and the conductive component 10 are removed, and the cover plate assembly 100, which is integrally formed by injection molding, is obtained.

[0105] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A conductive element (10), characterized in that, include: The current collector (11) has a first through hole (111); A protrusion (12) is disposed on one side of the current collector (11) and covers one end of the first through hole (111). The protrusion (12) has a first sidewall (121) in the circumferential direction. A second through hole (122) is disposed on the first sidewall (121) and the second through hole (122) communicates with the first through hole (111).

2. The conductive element (10) according to claim 1, characterized in that, There are multiple second through holes (122), and the multiple second through holes (122) are spaced apart along the connection line between the first sidewall (121) and the current collector (11).

3. The conductive element (10) according to claim 2, characterized in that, A groove (123) is provided on the side of the protrusion (12) facing the first through hole (111), and a plurality of second through holes (122) are connected to the first through hole (111) through the groove (123).

4. The conductive element (10) according to claim 1, characterized in that, There are two first sidewalls (121), which are located on both sides of the protrusion (12) respectively, and each of the two first sidewalls (121) is provided with a second through hole (122).

5. The conductive element (10) according to any one of claims 1-4, characterized in that, Along the axial direction of the first through hole (111), the protrusion (12) has a height dimension H1, which satisfies: 1mm≤H1≤3mm.

6. The conductive element (10) according to any one of claims 1-4, characterized in that, The protrusion (12) is a strip structure, and the first sidewall (121) extends radially along the collector (11).

7. The conductive element (10) according to claim 6, characterized in that, The surface of the protrusion (12) facing away from the current collector (11) has a width dimension W1, which satisfies: 2mm≤W1≤3mm.

8. The conductive element (10) according to any one of claims 1-4, characterized in that, The current collector (11) is provided with a plurality of first through holes (111), and there are a plurality of protrusions (12), with each of the plurality of protrusions (12) corresponding to a plurality of first through holes (111); And / or, the protrusion (12) is integrally disposed with the current collector (11).

9. The conductive element (10) according to any one of claims 1-4, characterized in that, A ring (112) is provided on the side of the current collector (11) away from the protrusion (12). The ring (112) extends around the axis of the conductive element (10) and is located on the side of the first through hole (111) close to the axis of the conductive element (10).

10. The conductive element (10) according to any one of claims 1-4, characterized in that, The conductive element (10) further includes a pole (13), one end of which is connected to the surface of the current collector (11) away from the protrusion (12), and the pole (13) and the current collector (11) are integrally formed.

11. The conductive element (10) according to claim 10, characterized in that, The conductive element (10) further includes a terminal (14), which is connected to the end of the pole (13) away from the current collector (11), and the terminal (14) and the pole (13) are integrally formed.

12. The conductive element (10) according to claim 11, characterized in that, The outer diameter of the terminal (14) is equal to the outer diameter of the pole post (13), and the terminal (14) and the pole post (13) are coaxially arranged.

13. A cover plate assembly (100), characterized in that, include: The cover plate (20) is provided with a third through hole (22) and a pole hole (21); The conductive element (10) according to any one of claims 1-12, wherein the current collector (11) is located on one side of the cover plate (20), the protrusion (12) is located on the side of the current collector (11) away from the cover plate (20), and the first through hole (111) is disposed opposite to the third through hole (22); An insulating component (40) is disposed between the cover plate (20) and the current collector (11). The insulating component (40) is provided with a fourth through hole (41), which connects the third through hole (22) and the second through hole (122). A first sealing element (50) is disposed in the pole hole (21) to seal the cover plate (20) and the pole (13); and An explosion-proof valve (30) is disposed in the third through hole (22).

14. The cover plate assembly (100) according to claim 13, characterized in that, The cover plate assembly (100) also includes a second seal (60); A plurality of third through holes (22) are provided on the cover plate (20), a plurality of first through holes (111) are provided on the collector (11), and there are a plurality of protrusions (12), each of the plurality of protrusions (12) corresponding to a plurality of first through holes (111), and each of the plurality of first through holes (111) corresponding to a plurality of third through holes (22). The explosion-proof valve (30) is provided in some of the third through holes (22), and the second sealing element (60) is provided in the remaining third through holes (22).

15. The cover plate assembly (100) according to claim 14, characterized in that, The second seal (60) is a metal sheet, and the second seal (60) is circumferentially welded into the corresponding third through hole (22).

16. The cover plate assembly (100) according to claim 13, characterized in that, The explosion-proof valve (30) is a metal sheet with grooves (31) on its surface, and the explosion-proof valve (30) is circumferentially welded to the corresponding third through hole (22).

17. The cover plate assembly (100) according to claim 16, characterized in that, A stepped groove (23) is provided on the wall of the third through hole (22). The stepped groove (23) is located away from the manifold (11), and the periphery of the explosion-proof valve (30) is located in the stepped groove (23).

18. The cover plate assembly (100) according to any one of claims 13-17, characterized in that, The first sealing element (50) is integrated with the insulating element (40).

19. 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 described in any one of claims 13-18, wherein the cover plate (20) covers the housing (200), and the protrusion (12) is connected to the electrode assembly (300) on the surface opposite to the current collector (11).

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