Conductive member, battery cell, and battery pack

Abstract

The application provides a conductive piece, a battery cell and a battery pack. The conductive piece comprises a first conductor and a second conductor. The first conductor comprises a first connecting part, a melting part and a second connecting part connected in sequence. The melting part is provided with a melting space. The second conductor is arranged in the melting space and is fixedly connected with the melting part to form a breakable connecting part. The second conductor is also electrically connected with the melting part. The breakable connecting part is configured to be at least partially disconnected when the temperature reaches a first threshold. The melting part is configured to be melted when the temperature reaches a second threshold. The first threshold is less than the second threshold. Through the above scheme, the overcurrent cross-sectional area of the conductive piece can be increased to reduce the resistance of the conductive piece, improve the overcurrent capacity of the conductive piece, and thus improve the energy efficiency of the battery cell. In addition, when the battery cell works abnormally, the breakable connecting part can be at least partially disconnected, so as to increase the current passing through the melting part, thereby facilitating the rapid melting of the melting part. In this way, the working performance 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 battery cell, and a battery pack. Background Technology

[0002] With the development of the new energy battery industry both domestically and internationally, the demand for batteries from energy storage and new energy vehicles is constantly increasing. While pursuing high energy density batteries, higher requirements are also being placed on battery reliability. To improve battery reliability, it is necessary to cut off the current path when a battery malfunctions to prevent safety accidents such as thermal runaway, fire, or explosion. Currently, three methods can be used to cut off the current path of a single battery cell (also known as a cell) when a cell malfunctions: overcharge safety device (OSD), current interruption device (CID), and fuse.

[0003] The short-circuit fuse structure involves creating a fusing space (e.g., a fusing hole, fusing groove, or fusing outlet) along the conductive path to reduce the overcurrent area of ​​a certain conductive component. When the overcurrent at that location reaches a threshold, the second conductor melts due to heat exceeding its melting point, thus interrupting the current path. Because of its simple structure and stable triggering parameters, the short-circuit fuse structure is a commonly used safety protection method for battery cells.

[0004] However, by creating a fusible space in the conductive components to reduce the current-carrying area, the current-carrying capacity will decrease, which will increase the internal resistance of the cell and affect the cell's performance. Utility Model Content

[0005] The embodiments of this application provide a conductive component, a battery cell, and a battery pack, which can improve the current carrying capacity of the conductive component, thereby reducing the internal resistance of the battery cell and improving the working performance of the battery cell.

[0006] In a first aspect, embodiments of this application provide a conductive element, which includes a first conductor and a second conductor; the first conductor includes a first connecting portion, a fusible portion, and a second connecting portion connected in sequence, and a fusible space is provided on the fusible portion; the second conductor is disposed in the fusible space and is fixedly connected to the fusible portion to form a breakable connecting portion; the second conductor is also electrically connected to the fusible portion; wherein the breakable connecting portion is configured to at least partially disconnect when the temperature reaches a first threshold; the fusible portion is configured to melt when the temperature reaches a second threshold; the first threshold is less than the second threshold.

[0007] In some embodiments, the second conductor is thermally fused to the inner wall of the fusion space to form a breakable connection portion, which is configured to melt when the temperature reaches a first threshold to reduce the connection area between the second conductor and the fusion portion.

[0008] In some embodiments, the second conductor is a conductive plastic component.

[0009] In some embodiments, the material of the conductive plastic part is one or more of conductive PPS, conductive ABS, conductive PC, and conductive PP.

[0010] In some embodiments, the second conductor includes a metal element and hot melt adhesive, a portion of the inner wall of the fusion-breaking space contacts a portion of the surface of the metal element, and another portion of the inner wall of the fusion-breaking space is connected to a portion of the surface of the metal element via the hot melt adhesive; the hot melt adhesive is configured to melt when a first threshold temperature is reached, thereby reducing the connection area between the second conductor and the fusion-breaking portion; or,

[0011] The second conductor includes a metal component and a thermoplastic alloy. The inner wall of the fusion space is connected to a portion of the surface of the metal component via the thermoplastic alloy. The thermoplastic alloy is configured to melt when the temperature reaches a first threshold to reduce the connection area between the second conductor and the fusion portion.

[0012] In some embodiments, the second connection portion includes two sub-connection portions, both of which are connected to the fusible portion, and the fusible space is located between the two sub-connection portions.

[0013] In some embodiments, the first conductor further includes a crossbeam located between the two sub-connecting portions and spaced apart from the first connecting portion. The two ends of the crossbeam are respectively connected to the two sub-connecting portions, and the surface of the second conductor away from the first connecting portion is connected to the crossbeam.

[0014] In some embodiments, the crossbeam and the sub-connector are integrally formed.

[0015] In some embodiments, the first conductor further includes a crossbeam located between the two sub-connecting portions and spaced apart from the first connecting portion. The two ends of the crossbeam are respectively connected to the two sub-connecting portions, and the end of the second conductor away from the first connecting portion overlaps with the crossbeam.

[0016] In some embodiments, the second conductor has a first surface along its thickness direction, the first surface being provided with an overlap groove, and the crossbeam is located in the overlap groove.

[0017] In some embodiments, the second conductor has a second surface opposite to the first surface, and the first and second surfaces are respectively flush with two surfaces in the thickness direction of the first conductor.

[0018] In some embodiments, the inner walls of the overlapping grooves are all in contact with the surface of the crossbeam; and / or, the crossbeam and the sub-connecting part are integrally formed.

[0019] In some embodiments, the first conductor is made of aluminum.

[0020] In some embodiments, the first threshold is between 60°C and 150°C.

[0021] Secondly, embodiments of this application provide a battery cell, which includes a housing, an electrode assembly, a terminal post, and the aforementioned conductive element; the housing has a receiving cavity; the electrode assembly is disposed in the receiving cavity; the terminal post passes through the housing; the conductive element is disposed in the receiving cavity and located between the electrode assembly and the terminal post, a first connecting portion is connected to the terminal post, and a second connecting portion is connected to the electrode assembly.

[0022] Thirdly, embodiments of this application provide a battery pack, which includes the aforementioned battery cells, and there are multiple battery cells electrically connected to each other.

[0023] The beneficial effects of the embodiments of this application are as follows:

[0024] In the embodiments of this application, by providing a second conductor in the fusion space of the fusion section, and ensuring that the breakable connection formed by the second conductor and the fusion section disconnects when the temperature reaches a first threshold, the current-carrying cross-sectional area of ​​the conductive component can be increased to reduce its resistance during normal operation, thereby improving its current-carrying capacity, reducing the internal resistance of the battery cell, and ultimately improving its energy efficiency. Furthermore, in case of abnormal operation, the breakable connection can be disconnected, ensuring that the fusion section can quickly melt and break the battery cell circuit, thus guaranteeing the reliability of the battery cell. This improves the performance of the battery cell. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the structure of the first conductive element provided in the embodiments of this application;

[0027] Figure 2 This is an exploded view of the first conductive element provided in the embodiments of this application;

[0028] Figure 3 This is a schematic diagram of the structure of the second conductive element provided in the embodiments of this application;

[0029] Figure 4 This is a schematic diagram of the structure of the third conductive element provided in the embodiments of this application;

[0030] Figure 5 This is a schematic diagram of the structure of the fourth conductive element provided in the embodiments of this application;

[0031] Figure 6 This is an exploded view of the fourth conductive element provided in the embodiments of this application;

[0032] Figure 7 This is a schematic diagram of the structure of the fifth conductive element provided in the embodiments of this application;

[0033] Figure 8 This is an exploded view of the fifth conductive element provided in the embodiments of this application;

[0034] Figure 9 This is a partial cross-sectional view of the fifth conductive element provided in the embodiments of this application.

[0035] Figure 10 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0036] Figure 11 This is a schematic diagram of the battery pack structure provided in an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100 - Conductive component;

[0039] 10 - First conductor;

[0040] 11-First connecting part;

[0041] 12-Second connecting part; 121-Sub-connecting part;

[0042] 13-Fuse section; 131-Fuse space;

[0043] 14-Crossbeam;

[0044] 20 - Second conductor; 211 - Metal part; 212 - Hot melt adhesive; 213 - Hot melt alloy; 214 - Overlap groove;

[0045] 21 - First surface; 22 - Second surface;

[0046] 30 - Disconnectable connection part;

[0047] 400 - Battery cell; 41 - Housing; 42 - Electrode assembly; 43 - Terminal post; 44 - Sealing ring; 45 - Lower plastic part;

[0048] 500 - Battery pack; 51 - Cover; 52 - Box body; 53 - Mounting cavity. Detailed Implementation

[0049] 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 the 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. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0050] 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.

[0051] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in a product that includes said element.

[0052] The following combination Figures 1 to 11 The conductive component 100, the battery cell 400, and the battery pack 500 provided in the embodiments of this application will be described in detail.

[0053] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the first conductive element 100 provided in the embodiments of this application. Figure 2This is an exploded view of a first conductive element 100 provided in an embodiment of this application. In a first aspect, an embodiment of this application provides a conductive element 100. The conductive element 100 includes a first conductor 10 and a second conductor 20. The first conductor 10 includes a first connecting portion 11, a fusing portion 13, and a second connecting portion 12 connected sequentially. A fusing space 131 is provided on the fusing portion 13. The second conductor 20 is disposed within the fusing space 131. The second conductor 20 is fixedly connected to the fusing portion 13 to form a breakable connection portion 30. The second conductor 20 is also electrically connected to the fusing portion 13. The breakable connection portion 30 is configured to at least partially disconnect when a first temperature threshold is reached. The fusing portion 13 is configured to melt when a second temperature threshold is reached. The first threshold is less than the second threshold.

[0054] It is understandable that the fusing space 131 can be a fusing hole, fusing groove, or fusing outlet, etc., which can reduce the current-carrying cross-sectional area of ​​the fusing part 13. The current-carrying cross-sectional area refers to the area of ​​the cross section that carries the current, which is the area of ​​the cross section perpendicular to the direction of current transmission.

[0055] For example, at least a portion of the circumferential surface of the second conductor 20 is connected to the surface of the fuse portion 13 used to define the fuse space 131 to form a breakable connection portion 30.

[0056] For example, the second conductor 20 can be heat-fused to the fuse portion 13 via plastic to form a breakable connection portion 30. When the temperature of the breakable connection portion 30 reaches a first threshold, the plastic of the breakable connection portion 30 melts, breaking at least a partial connection between the second conductor 20 and the fuse portion 13, thereby increasing the current flowing through the fuse portion 13 to facilitate the fuse portion 13 reaching a second threshold and melting. For example, when the temperature of the breakable connection portion 30 reaches the first threshold, the plastic of the breakable connection portion 30 melts, breaking the connection between the second conductor 20 and the fuse portion 13, thereby bypassing the second conductor 20, that is, preventing the second conductor 20 from carrying current, and allowing all current to flow through the fuse portion 13.

[0057] As another example, the second conductor 20 can also overlap or abut against the fuse portion 13 using a shape memory alloy to form a breakable connection portion 30. When the temperature of the breakable connection portion 30 reaches a first threshold, the shape memory alloy deforms, causing at least a portion of the connection between the second conductor 20 and the fuse portion 13 to move away from each other, thereby breaking at least a portion of the connection between the second conductor 20 and the fuse portion 13, thereby increasing the current passing through the fuse portion 13, so that the temperature of the fuse portion 13 reaches the second threshold and melts. For example, when the temperature of the breakable connection portion 30 reaches the first threshold, all connection portions between the breakable connection portion 30 and the fuse portion 13 are moved away from each other, so that the second conductor 20 is bypassed, that is, the second conductor 20 does not carry current, and all current is carried through the fuse portion 13.

[0058] As another example, an expansion member can also be configured. When the temperature of the disconnectable connection 30 reaches a first threshold, the expansion member expands due to heat and pushes at least a portion of the second conductor 20 away from the first conductor 10, thereby breaking at least a portion of the connection between the second conductor 20 and the fuse 13, thereby increasing the current passing through the fuse 13, so that the temperature of the fuse 13 reaches the second threshold and melts. For example, when the temperature of the disconnectable connection 30 reaches the first threshold, the expansion member expands due to heat and pushes the second conductor 20 entirely away from the first conductor 10, thereby breaking all connections between the second conductor 20 and the fuse 13, thereby bypassing the second conductor 20, that is, the second conductor 20 does not transmit current, and all current is transmitted through the fuse 13.

[0059] It is understandable that when the battery cell 400 is working normally, the current can be transmitted through the second conductor 20 to increase the cross-sectional area of ​​the current flow between the first conductor 10 and the second conductor 20.

[0060] According to the law of resistance: (In this formula, ρ is the resistivity of the material, L is the length in the direction of current transmission, and S is the cross-sectional area of ​​the current flow.) It can be seen that by setting the second conductor 20, the cross-sectional area of ​​the current flow of the conductive element 100 between the first connection part 11 and the second connection part 12 can be increased, thereby reducing the resistance of the conductive element 100 located between the first connection part 11 and the second connection part 12, thereby reducing the resistance of the conductive element 100 and improving the current flow capacity of the conductive element 100.

[0061] It is understandable that when an abnormal situation such as a short circuit in the battery cell 400 causes the temperature of the conductive component 100 to rise, the disconnectable connection 30 will at least partially disconnect when the temperature reaches a first threshold (e.g., 100°C), thereby allowing more current between the first conductor 10 and the second conductor 20 to flow through the fuse 13. This reduces the current-carrying cross-section between the first conductor 10 and the second conductor 20, and rapidly increases the current flowing through the fuse 13. According to Joule's law: Q=I 2 As shown in Rt, the heat generated by the fuse 13 increases with the increase of the current in the fuse 13. When the temperature of the fuse 13 reaches the second threshold (e.g., 600°C) due to the accumulated heat, the fuse 13 melts, disconnecting the first connection 11 and the second connection 12. The melting current of the fuse 13 can be selected as 14C / 0.5s (i.e., the current that melts in 0.5 seconds is 14C, where C is the rated capacity of the cell 400).

[0062] In this embodiment, by providing a second conductor 20 in the fusing space 131 of the fusing portion 13, and ensuring that the breakable connection 30 formed by the second conductor 20 and the fusing portion 13 is at least partially disconnected when the temperature reaches a first threshold, the current-carrying cross-sectional area of ​​the conductive element 100 can be increased to reduce the resistance of the conductive element 100 during normal operation of the battery cell 400, thereby improving the current-carrying capacity of the conductive element 100, reducing the internal resistance of the battery cell 400, and thus improving the energy efficiency of the battery cell 400. Furthermore, when the battery cell 400 malfunctions, the breakable connection 30 can be at least partially disconnected, thereby increasing the current passing through the fusing portion, facilitating the rapid melting of the fusing portion 13, disconnecting the battery cell 400 circuit, and ensuring the reliability of the battery cell 400. Thus, the working performance of the battery cell 400 can be improved.

[0063] In some embodiments, the second conductor 20 is thermally fused to the inner wall of the fusion-breaking space 131 to form a breakable connection portion 30. The breakable connection portion 30 is configured to melt when the temperature reaches a first threshold to reduce the connection area between the second conductor 20 and the fusion-breaking portion 13. For example, the connection between the second conductor 20 and the first conductor 10 can be completely broken, thereby causing the second conductor 20 to detach from the first conductor 10. In this way, the connection structure between the second conductor 20 and the fusion-breaking portion 13 is simple and easy to form, thereby reducing the manufacturing cost of the conductive element 100 and improving the processing efficiency of the conductive element 100.

[0064] For example, the second conductor 20 may be conductive polyethylene, conductive hot melt adhesive, or conductive plastic, etc.

[0065] In some embodiments, the second conductor 20 is a conductive plastic part. This allows the second conductor 20 to be both conductive and lightweight, contributing to the lightweight design of the battery cell 400. Furthermore, the conductive plastic part can be directly injection molded, a simple molding method that results in high molding efficiency and low molding cost.

[0066] For example, a conductive plastic part is injection molded into the fused space 131. This allows the conductive plastic part to be tightly bonded to the surface of the first conductor 10.

[0067] It can be understood that conductive plastic parts refer to components formed by mixing conductive materials (such as toner) into plastic.

[0068] In some embodiments, the material of the conductive plastic part is one or more of conductive PPS (Polyphenylene Sulfide), conductive ABS (Acrylonitrile Butadiene Styrene), conductive PC (Polycarbonate), and conductive PP (Polypropylene).

[0069] Among them, conductive PPS is easy to process and has low cost, conductive ABS is easy to process and has low cost, conductive PC has good impact resistance, and conductive PP has good moisture resistance.

[0070] In addition to the above-described method of thermally fusing the second conductor 20 with the inner wall of the fusion space 131, the following embodiments can also be used. Please refer to... Figure 3 , Figure 3 This is a schematic diagram of the structure of the second conductive element 100 provided in an embodiment of this application. In some embodiments, the second conductor 20 includes a metal element 211 and a hot melt adhesive 212. A portion of the inner wall of the fusion-breaking space 131 is in contact with a portion of the surface of the metal element 211. Another portion of the inner wall of the fusion-breaking space 131 is connected to a portion of the surface of the metal element 211 via the hot melt adhesive 212. The hot melt adhesive 212 is configured to melt when the temperature reaches a first threshold to reduce the connection area between the second conductor 20 and the fusion-breaking portion 13. For example, the hot melt adhesive 212 is configured to disconnect the connection between the first conductor 10 and the second conductor 20 when the temperature reaches the first threshold, allowing the second conductor 20 to detach from the first conductor 10.

[0071] It is understood that a portion of the inner wall of the fusible space 131 contacts a portion of the surface of the metal part 211 in order to achieve electrical connection between the metal part 211 and the fusible part 13.

[0072] In addition to the two methods described above for achieving thermal fusion connection between the second conductor 20 and the inner wall of the fusion space 131, the following embodiments can also be used. Please refer to... Figure 4 , Figure 4 This is a schematic diagram of the structure of a third conductive element 100 provided in an embodiment of this application. In some embodiments, the second conductor 20 includes a metal element 211 and a thermoplastic alloy 213. The inner wall of the fusion-breaking space 131 is connected to a portion of the surface of the metal element 211 via the thermoplastic alloy 213. The thermoplastic alloy 213 is configured to melt when the temperature reaches a first threshold, thereby reducing the connection area between the second conductor 20 and the fusion-breaking portion 13. For example, the thermoplastic alloy 213 is configured to disconnect the connection between the first conductor 10 and the second conductor 20 when the temperature reaches the first threshold, allowing the second conductor 20 to detach from the first conductor 10.

[0073] For example, the hot-melt alloy 213 can be a Wood's alloy with a melting point of 70°C to 100°C. The hot-melt alloy 213 can be a bismuth-tin alloy with a melting point of approximately 138°C. The hot-melt alloy 213 can also be an indium-based alloy with a melting point of 100°C to 150°C.

[0074] Please see Figure 1 In some embodiments, the second connecting portion 12 includes two sub-connecting portions 121. The two sub-connecting portions 121 are connected to the fuse portion 13. The fuse space 131 is located between the two sub-connecting portions 121. In this way, the second connecting portion 12 can be connected to multiple target objects through the two sub-connecting portions 121 respectively, thereby improving the ease of operation of connecting the second connecting portion 12 to the target objects.

[0075] Please see Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of the fourth conductive element 100 provided in the embodiments of this application. Figure 6 This is an exploded view of the fourth conductive element 100 provided in the embodiments of this application. In some embodiments, the first conductor 10 further includes a crossbeam 14. The crossbeam 14 is located between two sub-connecting portions 121 and is spaced apart from the first connecting portion 11. Both ends of the crossbeam 14 are connected to the two sub-connecting portions 121 respectively. The surface of the second conductor 20 away from the first connecting portion 11 is connected to the crossbeam 14. In this way, the displacement of the second conductor 20 can be restricted by the crossbeam 14, and the connection area between the second conductor 20 and the first conductor 10 can be increased to improve the connection strength between the second conductor 20 and the first conductor 10, prevent the second conductor 20 from falling off the first conductor 10 at will, and thus improve the structural reliability of the conductive element 100.

[0076] The crossbeam 14 is located on the side of the fusion space 131 away from the first connecting part 11.

[0077] It is understood that the surface of the second conductor 20 away from the first connection portion 11 can be electrically connected to the crossbeam 14.

[0078] Specifically, a portion of the circumferential surface of the second conductor 20 is connected to the fuse portion 13, and the remaining portion is connected to the crossbeam 14.

[0079] In some embodiments, the crossbeam 14 and the sub-connector 121 are integrally formed. This improves the stress state of the connection between the crossbeam 14 and the sub-connector 121, thereby increasing the connection strength between the crossbeam 14 and the sub-connector 121 and improving the structural reliability of the conductive component 100.

[0080] Please see Figure 7 and Figure 8 , Figure 7This is a schematic diagram of the structure of the fifth conductive element 100 provided in the embodiments of this application. Figure 8 This is an exploded view of the fifth conductive element 100 provided in the embodiments of this application. In some embodiments, the first conductor 10 further includes a crossbeam 14. The crossbeam 14 is located between two sub-connecting portions 121 and is spaced apart from the first connecting portion 11. Both ends of the crossbeam 14 are connected to the two sub-connecting portions 121 respectively. The end of the second conductor 20 away from the first connecting portion 11 overlaps with the crossbeam 14. In this way, not only can the connection strength between the second conductor 20 and the first conductor 10 be improved by the crossbeam 14, but the overlapping can also increase the mating area between the second conductor 20 and the crossbeam 14, which is beneficial to improving the connection strength between the second conductor 20 and the crossbeam 14 and preventing the second conductor 20 from falling off the first conductor 10 at will. In this way, the structural reliability of the conductive element 100 can be improved.

[0081] In addition, the displacement of the second conductor 20 can be restricted by the crossbeam 14, thereby improving the positional stability of the second conductor 20 and improving the structural reliability of the conductive component 100.

[0082] The crossbeam 14 is located on the side of the fusion space 131 away from the first connecting part 11.

[0083] Please see Figure 8 In some embodiments, the second conductor 20 has a first surface 21 along its thickness direction. The first surface 21 is provided with an overlap groove 214. The crossbeam 14 is located in the overlap groove 214. Thus, the overlap groove 214 increases the mating area between the second conductor 20 and the crossbeam 14, thereby improving the connection reliability between the second conductor 20 and the crossbeam 14.

[0084] Please see Figure 9 , Figure 9 This is a partial cross-sectional view of the fifth conductive element 100 provided in an embodiment of this application. In some embodiments, the second conductor 20 has a second surface 22 opposite to the first surface 21. The first surface 21 and the second surface 22 are respectively flush with two surfaces in the thickness direction of the first conductor 10. In this way, the surface flatness of the conductive element 100 can be improved to avoid the conductive element 100 scraping against other components, thereby facilitating the ease of connecting the conductive element 100 to other components.

[0085] It is understood that the side of the crossbeam 14 away from the bottom of the lap groove 214 is flush with one side of the first conductor 10, and the side of the crossbeam 14 facing the bottom of the lap groove 214 is lower than the other side of the bottom of the first groove. In this way, after the second conductor 20 is installed in the fusion space 131, the first surface 21 and the second surface 22 are respectively flush with the two surfaces in the thickness direction of the first conductor 10.

[0086] In some embodiments, the inner walls of the overlap groove 214 are all in contact with the surface of the crossbeam 14. This increases the mating area between the overlap groove 214 and the crossbeam 14, thereby improving the connection reliability between the second conductor 20 and the crossbeam 14.

[0087] In some embodiments, the crossbeam 14 and the sub-connector 121 are integrally formed. This improves the stress state of the connection between the crossbeam 14 and the sub-connector 121, thereby increasing the connection strength between the crossbeam 14 and the sub-connector 121 and improving the structural reliability of the conductive component 100.

[0088] In some embodiments, the first conductor 10 is made of aluminum. This allows the first conductor 10 to have good conductivity while also controlling its weight.

[0089] In some embodiments, the first threshold is between 60°C and 150°C.

[0090] It is understandable that the value of the first threshold can be adjusted according to the application requirements of the conductive component 100. For example, in environments with high safety requirements, the first threshold can be set to a smaller value. In scenarios where the reliability of the battery cell 400 is high, the first threshold can be set to a larger value.

[0091] Please see Figure 10 , Figure 10 This is a schematic diagram of the structure of the battery cell 400 provided in an embodiment of this application. In a second aspect, embodiments of this application also provide a battery cell 400. The battery cell 400 includes a housing 41, an electrode assembly 42, a terminal post 43, and the aforementioned conductive element 100. The housing 41 has a receiving cavity. The electrode assembly 42 is disposed in the receiving cavity. The terminal post 43 passes through the housing 41; the conductive element 100 is disposed in the receiving cavity and located between the electrode assembly 42 and the terminal post 43. A first connecting portion 11 is connected to the terminal post 43, and a second connecting portion 12 is connected to the electrode assembly 42.

[0092] It is understood that the electrode assembly 42 includes a positive electrode, a separator, and a negative electrode stacked in sequence.

[0093] It is understandable that there are two poles 43 and two conductive elements 100. One conductive element 100 connects one pole 43 to the positive electrode plate, and the other conductive element 100 connects the other pole 43 to the negative electrode plate.

[0094] It is understood that the battery cell 400 may also include a lower plastic component 45 and a sealing ring 44, which seals and insulates the housing 41 from the electrode post 43. The lower plastic component 45 is disposed inside the housing 41 and insulates the housing 41 from the electrode assembly 42.

[0095] For example, the first connecting part 11 is welded to the pole post 43, and the second connecting part 12 is welded to the tab of the electrode assembly 42.

[0096] It is understood that the battery cell 400 includes the aforementioned conductive element 100, and the battery cell 400 has all the beneficial effects of the conductive element 100, which will not be repeated here in this embodiment.

[0097] Please see Figure 11 , Figure 11 This is a schematic diagram of the structure of the battery pack 500 provided in an embodiment of this application. In a third aspect, an embodiment of this application provides a battery pack 500. The battery pack 500 includes the aforementioned battery cells 400, and there are multiple battery cells 400 electrically connected.

[0098] It is understood that the battery pack 500 may also include a cover 51 and a housing 52. The cover 51 and the housing 52 fit together to define a mounting cavity 53, and the battery cell 400 is disposed within the mounting cavity 53.

[0099] It is understood that the battery pack 500 includes the aforementioned battery cell 400, and the battery pack 500 has all the beneficial effects of the battery cell 400, which will not be repeated here in this embodiment.

[0100] 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 (100), characterized in that, include: The first conductor (10) includes a first connecting portion (11), a fusing portion (13), and a second connecting portion (12) connected in sequence, wherein a fusing space (131) is provided on the fusing portion (13); and A second conductor (20) is disposed within the fusible space (131). The second conductor (20) is fixedly connected to the fusible part (13) to form a breakable connection part (30). The second conductor (20) is also electrically connected to the fusible part (13). The disconnectable connection (30) is configured to disconnect at least partially when the temperature reaches a first threshold. The fuse (13) is configured to melt when the temperature reaches a second threshold. The first threshold is less than the second threshold.

2. The conductive element (100) according to claim 1, characterized in that, The second conductor (20) is thermally fused to the inner wall of the fused space (131) to form the breakable connection (30), which is configured to melt when the temperature reaches a first threshold to reduce the connection area between the second conductor (20) and the fused space (13).

3. The conductive element (100) according to claim 2, characterized in that, The second conductor (20) is a conductive plastic part.

4. The conductive element (100) according to claim 3, characterized in that, The conductive plastic part is made of one or more of conductive PPS, conductive ABS, conductive PC, and conductive PP.

5. The conductive element (100) according to claim 2, characterized in that, The second conductor (20) includes a metal element (211) and hot melt adhesive (212). A portion of the inner wall of the fused space (131) contacts a portion of the surface of the metal element (211), and another portion of the inner wall of the fused space (131) is connected to a portion of the surface of the metal element (211) via the hot melt adhesive (212). The hot melt adhesive (212) is configured to melt when the temperature reaches a first threshold to reduce the connection area between the second conductor (20) and the fused portion (13). The second conductor (20) includes a metal part (211) and a thermoplastic alloy (213), the inner wall of the fused space (131) being connected to a portion of the surface of the metal part (211) via the thermoplastic alloy (213); the thermoplastic alloy (213) is configured to melt when the temperature reaches a first threshold to reduce the connection area between the second conductor (20) and the fused portion (13).

6. The conductive element (100) according to any one of claims 1-5, characterized in that, The second connecting part (12) includes two sub-connecting parts (121), both of which are connected to the fuse part (13), and the fuse space (131) is located between the two sub-connecting parts (121).

7. The conductive element (100) according to claim 6, characterized in that, The first conductor (10) further includes a crossbeam (14), which is located between the two sub-connecting portions (121) and spaced apart from the first connecting portion (11). The two ends of the crossbeam (14) are respectively connected to the two sub-connecting portions (121), and the surface of the second conductor (20) away from the first connecting portion (11) is connected to the crossbeam (14).

8. The conductive element (100) according to claim 7, characterized in that, The crossbeam (14) and the sub-connecting part (121) are integrally formed.

9. The conductive element (100) according to claim 6, characterized in that, The first conductor (10) further includes a crossbeam (14), which is located between the two sub-connecting portions (121) and spaced apart from the first connecting portion (11). The two ends of the crossbeam (14) are respectively connected to the two sub-connecting portions (121), and the end of the second conductor (20) away from the first connecting portion (11) overlaps with the crossbeam (14).

10. The conductive element (100) according to claim 9, characterized in that, Along the thickness direction of the second conductor (20), the second conductor (20) has a first surface (21) with an overlap groove (214) provided on the first surface (21), and the crossbeam (14) is located in the overlap groove (214).

11. The conductive element (100) according to claim 10, characterized in that, The second conductor (20) has a second surface (22) opposite to the first surface (21), and the first surface (21) and the second surface (22) are flush with two surfaces in the thickness direction of the first conductor (10), respectively.

12. The conductive element (100) according to claim 10, characterized in that, The inner walls of the overlapping grooves (214) are all in contact with the surface of the crossbeam (14); and / or, The crossbeam (14) and the sub-connecting part (121) are integrally formed.

13. The conductive element (100) according to any one of claims 1-5, characterized in that, The first conductor (10) is made of aluminum.

14. The conductive element (100) according to any one of claims 1-5, characterized in that, The first threshold is between 60°C and 150°C.

15. A battery cell (400), characterized in that, include: The outer casing (41) has a receiving cavity; Electrode assembly (42) is disposed in the receiving cavity; A pole post (43) is inserted through the outer casing (41); and The conductive element (100) as described in any one of claims 1-14 is disposed in the receiving cavity and located between the electrode assembly (42) and the electrode post (43), wherein the first connecting portion (11) is connected to the electrode post (43) and the second connecting portion (12) is connected to the electrode assembly (42).

16. A battery pack (500), characterized in that, Includes the battery cell (400) as described in claim 15, wherein there are multiple battery cells (400) and the multiple battery cells (400) are electrically connected.

Images