Conductive member and battery pack

Abstract

The invention discloses a conductive member and a battery pack, the conductive member comprises at least one circuit board, the circuit board comprises an insulating layer and a conductive layer, and the insulating layer and the conductive layer are laminated along the thickness direction of the conductive member. The insulating layer is provided with a first fusing area, the conductive layer is provided with a second fusing area, and the first fusing area and the second fusing area are used for fusing when current flowing through the conductive component reaches a threshold value. And a time difference exists between the fusing time of the first fusing region and the fusing time of the second fusing region. Therefore, the circuit and the battery pack can be effectively protected by arranging the fusing areas in the circuit board of the conductive component, and the fusing areas which are fused later can be selectively fused according to the intensity and the duration of current by setting the mode that the fusing time of the two fusing areas is different, so that the service life of the circuit and the battery pack is prolonged, and the service life of the circuit and the battery pack is prolonged. Therefore, different protection measures under different fault conditions can be realized, and a more accurate protection effect can be provided for the circuit and the battery pack.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a conductive component and a battery pack. Background Art

[0002] With the widespread application of electric vehicles and energy storage systems, the safety of battery packs has become particularly important. During the operation of the battery pack, due to problems such as battery cell failure or battery management system failure, power outages or box disconnections may occur, making the battery cell or battery management system unable to work properly, which may cause a large amount of heat to be generated inside the battery pack, causing the temperature of the wiring harness to rise rapidly, which may cause the wiring harness to catch fire, resulting in a major safety hazard during the operation of the battery pack. Summary of the invention

[0003] In view of this, the present application provides a conductive component and a battery pack to solve the technical problem of battery unit failure leading to wiring harness fire in the prior art.

[0004] The present application provides a conductive component, which includes at least one circuit board. The circuit board includes an insulating layer and a conductive layer. The insulating layer and the conductive layer are stacked along a thickness direction of the conductive component.

[0005] The insulating layer is provided with a first fusing area, and the conductive layer is provided with a second fusing area, and the first fusing area and the second fusing area are used to be fused when the current flowing through the conductive component reaches a threshold value.

[0006] The time when the first fuse zone is blown is t1, the time when the second fuse zone is blown is t2, and t1 and t2 satisfy t1<t2.

[0007] In the embodiment of the present application, by setting a fuse zone in the circuit board of the conductive component, the circuit can be effectively protected. Since the insulating layer and the conductive layer of the circuit board respectively have a first fuse zone and a second fuse zone, and by setting the two fuse zones with different fuse times, a more precise protection effect can be provided to the circuit, so that the conductive component can be completely melted according to the actual working conditions to cut off the flow path of the current, or the conductive component can be incompletely melted to ensure the working stability of the electrical equipment in a short time.

[0008] In a possible implementation manner, the time t1 when the first fuse area is blown and the time t2 when the second fuse area is blown satisfy 10ms≤t2-t1≤50ms.

[0009] In a possible implementation manner, along the thickness direction of the conductive component, projections of the first fuse region and the second fuse region are staggered.

[0010] In a possible implementation manner, each fuse region is provided with a plurality of through holes, and the plurality of through holes are distributed at intervals along a direction perpendicular to a current transmission direction.

[0011] In a possible implementation manner, a fuse portion is formed between adjacent through holes, and on the same insulating layer or the same conductive layer, the length, width, and thickness of each fuse portion are equal.

[0012] In a possible implementation manner, the material of the first fuse region is polyimide, and the material of the second fuse region is copper.

[0013] In a possible implementation manner, the resistance of each fuse zone is R, and R satisfies 0.5Ω≤R≤150Ω, and / or the thickness of each fuse zone is h, and h satisfies 0.1mm≤h≤0.5mm.

[0014] In a possible embodiment, the conductive component includes a plurality of circuit boards, which are stacked along the thickness direction of the conductive component, and the projections of the first fuse zones of adjacent circuit boards at least partially overlap, and the projections of the second fuse zones at least partially overlap.

[0015] The number of layers of the circuit board is N, and N satisfies 2≤N≤10.

[0016] In a possible implementation, along the fusing order of the insulating layers, the thickness of the fusing zones of the multiple insulating layers increases successively, along the fusing order of the conductive layers, the resistance of the fusing zones of the multiple insulating layers decreases successively, or, the thickness of the fusing zones of the multiple insulating layers increases successively.

[0017] In a possible implementation manner, the insulating layer and the conductive layer further include non-fuse regions, and along the current transmission direction, each of the non-fuse regions is located at two sides of each of the fusing regions.

[0018] Wherein, in the insulating layer, the thickness of the melting area is smaller than the thickness of the non-melting area, and in the conductive layer, the thickness of the melting area is larger than the thickness of the non-melting area.

[0019] The present application also provides a battery pack, which includes a battery module, a motor control system and a conductive component, wherein the conductive component is any one of the conductive components described above, and the conductive component connects the battery module and the motor control system.

[0020] In an embodiment of the present application, one end of the conductive component can be electrically connected to the battery module through a wiring harness, and the other end can be electrically connected to the motor control system through a wiring harness, so that the conductive component can be connected in series in the circuit between the battery module and the motor control system for transmitting current.

[0021] During the operation of the battery pack, the battery module may generate a large amount of current when a short circuit or other adverse situation occurs, and the conductive components will generate a large amount of heat when a large amount of current flows through them. This heat can cause the conductive components to melt, thereby cutting off the current flow path to avoid safety problems caused by excessive current during the operation of the circuit, and then can protect the wiring harness, battery module and motor control system in the circuit, which is beneficial to improve the safety of the battery pack during operation.

[0022] Among them, the conductive component includes at least a first fuse zone and a second fuse zone. By setting the first fuse zone and the second fuse zone to fuse in a preset order, there is a time difference in fusing time between the two, so that the conductive component can be selectively fused according to the intensity and duration of the current, and then different protection measures can be implemented in different fault conditions, which is conducive to further improving the versatility of the conductive component.

[0023] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A schematic diagram of the structure of a circuit board provided in this application in one embodiment; Figure 2 yes Figure 1 Schematic diagram of the structure along its thickness direction; Figure 3 It is a schematic diagram of the structure of the through hole and the fuse part provided in this application; Figure 4 It is a schematic structural diagram of a conductive component provided in the present application in one embodiment.

[0026] Description of reference numerals: 1- Circuit board; 11- insulation layer; 12- conductive layer; 13-Fuse zone; 131-first fuse area; 132-second fuse area; 133-through hole; 134-fuse unit; 14- non-fuse area; 2-conductive member; 21- a first circuit board; 211- a first insulating layer; 212-first conductive layer; 22- second circuit board; 221- second insulating layer; 222- a second conductive layer; 23- third circuit board; 231- third insulating layer; 232- a third conductive layer; 3- Wiring harness.

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0028] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0029] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0030] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0031] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0032] The embodiment of the present application provides a conductive member for a battery pack, such as Figure 1 and Figure 2 As shown, the conductive component 2 includes at least one circuit board 1 , and the circuit board 1 includes an insulating layer 11 and a conductive layer 12 . The insulating layer 11 and the conductive layer 12 are stacked along the thickness direction of the conductive component 2 .

[0033] In the embodiment of the present application, one end of the conductive component 2 is electrically connected to the battery module through the wiring harness 3, and the other end is electrically connected to the electrical equipment through the wiring harness 3, so that the conductive component 2 can be connected in series in the circuit for transmitting current.

[0034] Specifically, the conductive component 2 includes at least one circuit board 1, and the circuit board 1 includes a stacked insulating layer 11 and a conductive layer 12. The conductive layer 12 can be deposited on the insulating layer 11 by printing or laminating to improve the structural stability of the circuit board 1, thereby improving the reliability of the circuit board 1 during operation, and thus making the conductive component 2 have a strong overcurrent capacity to meet the overcurrent requirements in different circuits.

[0035] Among them, the insulating layer 11 is provided with a first melting area 131, and the conductive layer 12 is provided with a second melting area 132. Both the first melting area 131 and the second melting area 132 can be melted when the current flowing through the conductive component 2 reaches a threshold. Since the battery module may generate a large amount of current when a short circuit or other adverse conditions occur, and the conductive component 2 generates a large amount of heat when a large amount of current flows through it, the first melting area 131 of the insulating layer 11 and the second melting area 132 of the conductive layer 12 can be melted by the heat, so that the circuit board 1 and the conductive component 2 can be melted, and then the current flow path can be cut off. Therefore, through such a design method, it is possible to avoid safety problems caused by excessive current in the circuit during operation, such as high temperature causing the wiring harness 3 to catch fire, resulting in damage to the battery module and electrical equipment, so that the wiring harness 3, the battery module and various electrical equipment in the circuit can be protected, which is conducive to improving the safety of the battery pack during operation.

[0036] At the same time, the time when the first fuse area 131 is fused is t1, and the time when the second fuse area 132 is fused is t2, and t1 and t2 satisfy t1<t2. Since the first fuse area 131 and the second fuse area 132 are fused at different times, there is a time difference between the two, which is conducive to reducing the damage caused by instantaneous overload to the circuit and improving the safety of the circuit during operation. Therefore, through such a design method, the circuit can have more accurate fault protection.

[0037] Specifically, when the current flowing through the conductive component 2 exceeds a threshold value, the fuse zone 13 that blows first can, in a preset order, cause the circuit to be disconnected for a short time, thereby preventing the current from causing greater damage to the wiring harness 3 and various electrical equipment. Due to the existence of a time difference, the fuse zone 13 that blows later can be selectively blown according to the intensity and duration of the current, thereby achieving different protection measures in different fault conditions.

[0038] Take the case where the conductive component 2 only includes one circuit board 1 as an example.

[0039] When a fault occurs, the first fuse zone 131 is blown first in a preset order. If the current intensity is still high and lasts for a long time at this time, the conductive component 2 will continue to heat up. After the second fuse zone 132 is completely blown, the conductive component 2 will be completely blown, thereby cutting off the current flow path and protecting the circuit. If the current intensity is low and the high-intensity current lasts for a short time, the temperature of the conductive component 2 will no longer rise, and the second fuse zone 132 will be in a state of not starting to blow or not completely blowing, so that the conductive component 2 can still transmit current to ensure the working performance of the battery pack, thereby ensuring the working stability of the electrical equipment in a short time, and then waiting for the arrival of maintenance personnel while ensuring the safety of the circuit. At the same time, if a fault occurs again in the future, the second fuse zone 132 will also be blown under preset conditions to cut off the current flow path and protect the circuit.

[0040] More specifically, the fusing time of the two can be controlled by setting at least one of the material, resistance, size range and heat distribution of the first fusing zone 131 and the second fusing zone 132 to be different, so as to increase the diversity of the control methods. This allows the corresponding control method to be selected according to different usage environments, which is beneficial to expanding the scope of use of the conductive component 2 and, while providing good protection for the battery pack, reduces the design difficulty and production cost of the conductive component 2, which is more in line with actual production needs.

[0041] Therefore, this embodiment can effectively protect the circuit by setting the fuse zone 13 in the circuit board 1 of the conductive component 2, and because the insulating layer 11 and the conductive layer 12 of the circuit board 1 respectively have the first fuse zone 131 and the second fuse zone 132, and by setting the two fuse zones 13 with different fuse times, it can provide a more accurate protection for the circuit, so as to achieve complete melting of the conductive component 2 according to the actual working conditions to cut off the flow path of the current, or to achieve incomplete melting of the conductive component 2 to ensure the working stability of the electrical equipment in a short time.

[0042] In a possible implementation, the conductive component 2 and the wiring harness 3 can be electrically connected by welding to reduce the possibility of loosening or breaking between the two, and enable the connection to withstand a certain range of vibration or temperature changes, which is beneficial to improving the stability and reliability of the connection between the conductive component 2 and the wiring harness 3. At the same time, the method of achieving electrical connection by welding can also make the connection between the conductive component 2 and the wiring harness 3 have good conductivity, which is beneficial to improving the transmission efficiency of the current and the stability of the current during the transmission process. In addition, compared with other processing methods, welding has a relatively low cost and is easy to operate, which is more in line with actual production needs.

[0043] In a specific implementation manner, the time t1 when the first fuse region 131 is blown and the time t2 when the second fuse region 132 is blown satisfy 10ms≤t2-t1≤50ms.

[0044] In the embodiment of the present application, t2-t1 can specifically be 10ms, 12ms, 14ms, 16ms, 18ms, 20ms, 22ms, 24ms, 26ms, 28ms, 30ms, 32ms, 34ms, 36ms, 38ms, 40ms, 42ms, 44ms, 46ms, 48ms, 50ms, etc.

[0045] When the difference in fusing time between the first fusing zone 131 and the second fusing zone 132 is too small (for example, t2-t1 is less than 10 ms), the overall overcurrent protection capability of the conductive component 2 is poor, resulting in the need for replacement after each fusing, resulting in high maintenance costs.

[0046] When the time difference between the first fuse zone 131 and the second fuse zone 132 is too large (for example, t2-t1 is greater than 50ms), the high-intensity current in the circuit lasts too long, which can easily cause damage to electrical equipment during transmission, resulting in a higher safety risk. The greater the time difference, the longer the second fuse zone 132 takes to blow, which will affect the time for subsequent diagnosis and maintenance.

[0047] Therefore, when the melting time difference between the first melting zone 131 and the second melting zone 132 satisfies 10ms≤t2-t1≤50ms, the conductive component 2 has good overload protection capability and can prevent high-intensity current from flowing in the circuit for a long time, which is beneficial to reducing safety hazards and ensuring the normal working state of the circuit.

[0048] In a specific embodiment, Figure 1 and Figure 2 As shown, along the thickness direction of the conductive component 2, the projections of the first fuse region 131 and the second fuse region 132 are staggered.

[0049] In the embodiment of the present application, by staggering the first fuse zone 131 and the second fuse zone 132 along the thickness direction of the conductive component 2, heat concentration can be avoided during the heating process of the conductive component 2, thereby reducing the possibility of the second fuse zone 132 being melted faster under the influence of the first fuse zone 131, and further reducing the possibility of the melting time difference between the first fuse zone 131 and the second fuse zone 132 being reduced, thereby ensuring the overcurrent protection capability of the conductive component 2.

[0050] At the same time, distributing the two components in a staggered manner along the thickness direction of the conductive component 2 can also facilitate diagnosis and maintenance by the staff, thereby shortening maintenance time and improving work efficiency.

[0051] In a specific embodiment, Figure 1 and Figure 3 As shown, the fuse region 13 is provided with a plurality of through holes 133 , and the plurality of through holes 133 are distributed at intervals along a direction perpendicular to the transmission direction of the current.

[0052] In the embodiment of the present application, by providing a through hole 133 in each fuse zone 13, the structural strength of each fuse zone 13 can be appropriately reduced, so that each fuse zone 13 is easier to melt under high temperature conditions, and the possibility of each fuse zone 13 melting for too long is reduced, and the melting efficiency of each fuse zone 13 is improved, thereby ensuring that the conductive component 2 can be melted in time within the preset time, so as to improve the protection of the circuit.

[0053] At the same time, by distributing multiple through holes 133 at intervals perpendicular to the current transmission direction, the overall current flow cross-sectional area of ​​each fuse zone 13 can be reduced, so that when the current flows through the conductive component 2, it can flow between two adjacent through holes 133, so that when the high-intensity current flows, there can be higher heat between two adjacent through holes 133, so as to further accelerate the fusing efficiency of each fuse zone 13.

[0054] In a possible implementation, a plurality of through holes 133 are spaced apart along a direction perpendicular to the current transmission direction, and the spacing between two adjacent through holes 133 is equal, so as to ensure the uniformity of heat distribution in each melting zone 13, thereby further shortening the melting time of each melting zone 13.

[0055] In a possible implementation, the plurality of through holes 133 may be distributed at intervals perpendicular to the current transmission direction and also distributed at intervals along the current transmission direction, so that the plurality of through holes 133 are distributed in a mesh shape on each fuse region 13 .

[0056] In a possible implementation manner, the shape of the through hole 133 may be one or more of a circle, an ellipse, a triangle and a rectangle, or may be a polygon or other irregular shapes.

[0057] In a possible implementation, the through hole 133 may be formed by punching, which is simple to operate and easy to implement, and is beneficial to improving the processing efficiency of the through hole 133 .

[0058] In a specific embodiment, Figure 1 and Figure 3 As shown, fuse parts 134 are formed between adjacent through holes 133 , and on the same insulating layer 11 or the same conductive layer 12 , the length, width and thickness of each fuse part 134 are equal.

[0059] In the embodiment of the present application, by arranging multiple through holes 133 in each fuse zone 13, a fuse portion 134 can be formed between two adjacent through holes 133, thereby reducing the overall current flow cross-sectional area of ​​each fuse zone 13, so that when the current flows through the conductive component 2, it can flow through each fuse portion 134, and then during the flow of high-intensity current, each fuse portion 134 can have a higher heat, so as to further accelerate the fusing efficiency of each fuse zone 13.

[0060] At the same time, when multiple through holes 133 are evenly distributed in each fuse zone 13, the length, width and thickness of each fuse part 134 are equal, so that the flow cross-sectional area of ​​each fuse part 134 is equal, so that each fuse part 134 can be melted at the same time under high temperature conditions, which is beneficial to improving the consistency of each fuse zone 13 when melting.

[0061] In a specific implementation, the material of the first fuse region 131 is polyimide, and the material of the second fuse region 132 is copper.

[0062] In the embodiment of the present application, when the materials of the first fuse region 131 and the second fuse region 132 are polyimide and copper respectively, the first fuse region 131 and the second fuse region 132 have good flexibility, so that the first fuse region 131 and the second fuse region 132 can be bent, thereby further expanding the use range of the conductive component 2, so that the conductive component 2 can be applied to a flexible circuit. At the same time, polyimide has good heat resistance and mechanical strength, and copper has good conductivity and ductility, which is conducive to improving the working performance of the conductive component 2.

[0063] In a possible implementation, the insulating layer 11 is made of polyimide as a whole, and the conductive layer 12 is made of copper as a whole. With such a design, the material of the first fuse region 131 is consistent with the material of other regions in the insulating layer 11, and the material of the second fuse region 132 is consistent with the material of other regions in the conductive layer 12, so that the insulating layer 11 and the conductive layer 12 can be an integrally formed structure, which is conducive to improving the overall consistency of the insulating layer 11 and the conductive layer 12.

[0064] At the same time, when the material of each fuse zone 13 is consistent with that of other areas of each layer, the resistance, size range and heat distribution of each fuse zone 13 can be changed to ensure that the first fuse zone 131 and the second fuse zone 132 are easier to fuse than other areas in the insulating layer 11 and the conductive layer 12, respectively, thereby ensuring the stability and reliability of the conductive component 2 during operation.

[0065] In a possible implementation, the circuit board 1 may be a flexible circuit board. Since the flexible circuit board is easy to integrate, there is no need to significantly change the overall structure of the battery pack, which is conducive to reducing the complexity of installing the conductive member 2 and can effectively reduce the cost of modifying the battery pack. When the circuit board 1 is a flexible circuit board, the conductive member 2 can adapt to the internal structure of various battery packs, which is conducive to further improving the versatility of the conductive member 2.

[0066] In a specific implementation manner, the resistance of each fuse region 13 is R, and R satisfies 0.5Ω≤R≤150Ω.

[0067] In the embodiment of the present application, the resistance of each fuse area 13 can be 0.5Ω, 5Ω, 10.5Ω, 15Ω, 20.5Ω, 25Ω, 30.5Ω, 35Ω, 40.5Ω, 45Ω, 50.5Ω, 55Ω, 60.5Ω, 65Ω, 70.5Ω, 75Ω, 80.5Ω, 85Ω, 90.5Ω, 95Ω, 100.5Ω, 105Ω, 110.5Ω, 115Ω, 120.5Ω, 125Ω, 130.5Ω, 135Ω, 140.5Ω, 145Ω, 150Ω, etc.

[0068] When the resistance of each fuse zone 13 is too small (for example, R is less than 0.5Ω), under normal working conditions, when the current flows through the conductive component 2, it will generate high heat and cause each fuse zone 13 to fuse quickly, resulting in failure of the overcurrent capacity of the conductive component 2, thereby failing to ensure the normal operation of the circuit. When the resistance of each fuse zone 13 is too large (for example, R is greater than 150Ω), under normal working conditions, it is not easy for the current to flow through the conductive component 2, resulting in failure of the electrical equipment in the circuit to work normally. Therefore, when the resistance of each fuse zone 13 satisfies 0.5Ω≤R≤150Ω, the current can flow smoothly through the conductive component 2 without generating much heat, so as to ensure that the conductive component 2 has good overcurrent capacity while improving the overload protection capability of the conductive component 2.

[0069] In a specific implementation manner, the thickness of each fuse region 13 is h, and h satisfies 0.1 mm≤h≤0.5 mm.

[0070] In the embodiment of the present application, the thickness of each fuse zone 13 can be 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, 0.42mm, 0.44mm, 0.46mm, 0.48mm, 0.5mm, etc.

[0071] When the thickness of each fuse zone 13 is too small (for example, h is less than 0.1mm), the flow cross-sectional area of ​​the fuse zone 13 is too small, resulting in the conductive component 2 being unable to meet the flow demand, thereby affecting the normal operation of each electrical device. When the thickness of each fuse zone 13 is too large (for example, h is greater than 0.5mm), the overall thickness of the conductive component 2 is too large, resulting in too much space occupied by the conductive component 2, thereby affecting the space utilization. Therefore, when the thickness of each fuse zone 13 satisfies 0.1mm≤h≤0.5mm, the overall thickness of the conductive component 2 is moderate and has good flow capacity, so as to meet the flow demand while improving the space utilization of the installation space of the conductive component 2.

[0072] In a specific embodiment, Figure 1 and Figure 4 As shown, the conductive component 2 includes multiple circuit boards 1. Along the thickness direction of the conductive component 2, the multiple circuit boards 1 are stacked, and the projections of the first fuse zones 131 of adjacent circuit boards 1 at least partially overlap, and the projections of the second fuse zones 132 at least partially overlap.

[0073] In the embodiment of the present application, the conductive component 2 includes a plurality of circuit boards 1 stacked along the thickness direction thereof, one end of each circuit board 1 is electrically connected to the battery module through the same wiring harness 3, and the other end is electrically connected to the electrical device through the same wiring harness 3, so that the plurality of circuit boards 1 are connected in series in the circuit for transmitting current. Such a design can further improve the overcurrent capacity of the conductive component 2 to meet the overcurrent requirements in different circuits.

[0074] Among them, each circuit board 1 has an independent fusing function, which can provide multiple protections for the circuit, so that after the first fusing area 13 is blown, the subsequent fusing areas 13 can still protect the circuit, which is conducive to further improving the safety of the circuit during operation. In addition, by providing multiple circuit boards 1 with independent fusing functions, the number of circuit repairs can be reduced, thereby reducing maintenance costs.

[0075] At the same time, along the thickness direction of the conductive member 2, the projections of the first fuse zones 131 of each circuit board 1 at least partially overlap, and the projections of the second fuse zones 132 of each circuit board 1 at least partially overlap. With such a design, local heat concentration can be avoided during the heating process of the conductive member 2, thereby reducing the possibility of the second fuse zone 132 being melted faster under the influence of the two adjacent first fuse zones 131, and further reducing the possibility of the melting time difference between the first fuse zone 131 and the second fuse zone 132 being reduced, so as to ensure the overcurrent protection capability of the conductive member 2.

[0076] In addition, in the process of stacking multiple circuit boards 1 along the thickness direction of the conductive component 2, the insulating layer 11 of one circuit board 1 is tightly fitted with the conductive layer 12 of the adjacent circuit board 1, which can not only shorten the overall thickness of the conductive component 2 to save installation space, but also improve the heat transfer efficiency between the circuit boards 1, so that the insulating layer 11 in each circuit board 1 can be fused under the action of the adjacent conductive layer 12, and the tightly fitted multiple circuit boards 1 can also effectively avoid internal short circuits in the conductive component 2, thereby improving the stability and reliability of the conductive component 2 during operation.

[0077] In a specific implementation manner, the number of layers of the circuit board 1 is N, and N satisfies 2≤N≤10.

[0078] Specifically, the number of layers of the circuit board 1 can be 2, 3, 4, 5, 6, 7, 8, 9, 10, etc. When the number of layers of the circuit board 1 is too small (for example, N is less than 2), the conductive component 2 cannot play a multiple protection role for the circuit, so that the overload protection capacity of the conductive component 2 is reduced. When the number of layers of the circuit board 1 is too large (for example, N is greater than 10), the overall thickness of the conductive component 2 is too large. During the installation process, the conductive component 2 occupies too much space, which not only affects the space utilization rate, but also leads to an increase in the production cost of the conductive component 2. Therefore, when the number of layers of the circuit board 1 satisfies 2≤N≤10, the number of layers of the circuit board 1 is moderate, so that the overall thickness of the conductive component 2 is moderate, so that the conductive component 2 has multiple overload protection capabilities, which can improve the safety of the circuit during operation, and at the same time, can also reduce the production cost of the conductive component 2.

[0079] In one possible embodiment, the outer edges of each circuit board 1 are flush along the thickness of the conductive component 1 so that the length and width of each circuit board 1 are equal, so that the multiple circuit boards 1 can be easily positioned during the stacking process, which is beneficial to improving the assembly efficiency of the multiple circuit boards 1.

[0080] In a specific embodiment, Figure 1 and Figure 4 As shown, along the fusing order of the insulating layer 11, the thickness of the fusing zones 13 of the multiple insulating layers 11 increases successively, and along the fusing order of the conductive layer 12, the resistance of the fusing zones 13 of the multiple conductive layers 12 decreases successively, or, the thickness of the fusing zones 13 of the multiple conductive layers 12 increases successively.

[0081] In the embodiment of the present application, since the insulating layer 11 and the conductive layer 12 are made of different materials, it is possible to control the fusing order of each layer by setting different thicknesses between multiple insulating layers 11 and different resistances or thicknesses between multiple conductive layers 12, so that there is a time difference between the fusing times of each layer, so as to satisfy the multiple protection functions of the conductive component 2 for the circuit.

[0082] Specifically, on the same circuit board 1, since the insulating layer 11 is made of polyimide and the conductive layer 12 is made of copper, during the melting process of the conductive component 2, the first melting area 131 with a lower melting point will melt first, and the second melting area 132 with a higher melting point will melt later.

[0083] Specifically, when the insulating layers 11 of the circuit boards 1 are made of the same material, in a high temperature environment, the first melting area 131 with a thinner thickness will melt first, and the first melting area 131 with a thicker thickness will melt later.

[0084] Specifically, when the conductive layers 12 of each circuit board 1 are made of the same material and the dimensions of each second fuse zone 132 along the thickness direction of the conductive component 2 are the same, when a high-intensity current flows through the conductive component 2, the second fuse zone 132 with a larger resistance generates more heat, and the second fuse zone 132 with a smaller resistance generates less heat, so that the second fuse zone 132 with a larger resistance will melt first, and the second fuse zone 132 with a smaller resistance will melt later.

[0085] Specifically, when the conductive layer 12 of each circuit board 1 is made of the same material and the dimensions of each second fuse zone 132 along the current transmission direction are the same, when a high-intensity current flows through the conductive component 2, the second fuse zone 132 with a thinner thickness generates more heat, and the second fuse zone 132 with a thicker thickness generates less heat, so that the second fuse zone 132 with a thinner thickness will melt first, and the second fuse zone 132 with a thicker thickness will melt later.

[0086] Therefore, this embodiment controls the fusing order of each fusing zone 13 by adjusting the thickness of each first fusing zone 131 and the resistance or thickness of each second fusing zone 132, so that the fusing times of two adjacent fusing zones 13 in the fusing order are different, thereby providing more accurate protection for the circuit, so as to achieve complete fusing of the conductive component 2 according to actual working conditions to cut off the current flow path, or to achieve incomplete fusing of the conductive component 2 to ensure the working stability of the electrical equipment in a short time.

[0087] In a possible implementation, Figure 4 As shown, along the thickness direction of the conductive member 2, the conductive member 2 includes a first circuit board 21, a second circuit board 22, and a third circuit board 23 which are stacked. The first circuit board 21 includes a first insulating layer 211 and a first conductive layer 212 which are stacked, the second circuit board 22 includes a second insulating layer 221 and a second conductive layer 222 which are stacked, and the third circuit board 23 includes a third insulating layer 231 and a third conductive layer 232 which are stacked.

[0088] When the conductive component 2 is melted from top to bottom in a preset order, the thickness of the first insulating layer 211, the second insulating layer 221 and the third insulating layer 231 gradually increases; the resistance of the first conductive layer 212, the second conductive layer 222 and the third conductive layer 232 gradually decreases, wherein the second melting areas 132 of the three have the same size along their thickness direction and the size along the current transmission direction gradually decreases, or the thickness of the first conductive layer 212, the second conductive layer 222 and the third conductive layer 232 gradually increases, wherein the second melting areas 132 of the three have the same size along the current transmission direction.

[0089] When the conductive component 2 is blown from bottom to top in a preset order, the thickness of the first insulating layer 211, the second insulating layer 221 and the third insulating layer 231 gradually decreases; the resistance of the first conductive layer 212, the second conductive layer 222 and the third conductive layer 232 gradually increases, wherein the second fuse zones 132 of the three have the same size along their thickness direction and the size along the current transmission direction gradually increases, or the thickness of the first conductive layer 212, the second conductive layer 222 and the third conductive layer 232 gradually decreases, wherein the second fuse zones 132 of the three have the same size along the current transmission direction.

[0090] When the conductive component 2 is blown from the inside to the outside in a preset order, the thickness of the second insulating layer 221, the third insulating layer 231 and the first insulating layer 211 gradually increases; the resistance of the second conductive layer 222, the third conductive layer 232, and the first conductive layer 212 gradually decreases, wherein the second fuse zones 132 of the three have the same size along their thickness direction and the size along the current transmission direction gradually decreases, or the thickness of the second conductive layer 222, the third conductive layer 232, and the first conductive layer 212 gradually increases, wherein the second fuse zones 132 of the three have the same size along the current transmission direction.

[0091] When the conductive component 2 is blown from the outside to the inside according to a preset order, the thickness of the first insulating layer 211, the third insulating layer 231 and the second insulating layer 221 gradually increases; the resistance of the third conductive layer 232, the first conductive layer 212 and the second conductive layer 222 gradually decreases, wherein the second fuse zones 132 of the three have the same size along their thickness direction and the size along the current transmission direction gradually decreases, or the thickness of the third conductive layer 232, the first conductive layer 212 and the second conductive layer 222 gradually increases, wherein the second fuse zones 132 of the three have the same size along the current transmission direction.

[0092] In a specific embodiment, Figure 1 As shown, the insulating layer 11 and the conductive layer 12 further include non-fuse regions 14 . Along the current transmission direction, each non-fuse region 14 is located on both sides of each fuse region 13 .

[0093] In the embodiment of the present application, the insulating layer 11 includes at least two first non-fuse regions (not marked in the figure), and the conductive layer 12 includes at least two second non-fuse regions (not marked in the figure).

[0094] Specifically, along the current transmission direction, the first fuse zone 131 is set between the two first non-fuse zones so that the end of the first fuse zone 131 cannot be connected to the wiring harness 3, thereby reducing the possibility of the wiring harness 3 being heated and catching fire during the melting of the first fuse zone 131; accordingly, along the current transmission direction, the second fuse zone 132 is set between the two second non-fuse zones so that the end of the second fuse zone 132 cannot be connected to the wiring harness 3, thereby reducing the possibility of the wiring harness 3 being heated and catching fire during the melting of the second fuse zone 132, which is beneficial to improving the overall safety of the circuit.

[0095] In the thickness direction of the conductive component 2 , in the insulating layer 11 , the thickness of the melting area 13 is smaller than that of the non-melting area 14 , and in the conductive layer 12 , the thickness of the melting area 13 is larger than that of the non-melting area 14 .

[0096] Specifically, take the case where the conductive component 2 includes only one circuit board 1. In the insulating layer 11, the thickness of the first fuse region 131 is less than the thickness of the first non-fuse regions on both sides thereof, so that when a high-intensity current flows through the conductive component 2, the first fuse region 131 is more easily fused than the first non-fuse regions; in the conductive layer 12, the thickness of the second fuse region 132 is greater than the thickness of the second non-fuse regions on both sides thereof, so that when a high-intensity current flows through the conductive component 2, the second fuse region 132 is more easily fused than the second non-fuse regions.

[0097] Therefore, this embodiment can prevent the melting zone 13 from damaging the components connected to and / or adjacent to the conductive member 2 during the melting process by setting the melting zone 13 between the two non-melting zones 14, which is beneficial to improving the overall safety of the battery pack. At the same time, by setting the thickness of the first melting zone 131 to be smaller than the thickness of the first non-melting zone, and the thickness of the second melting zone 132 to be larger than the thickness of the second non-melting zone, the melting zones 13 of each layer are easier to melt, and this method is easy to implement and more in line with actual production needs.

[0098] An embodiment of the present application further provides a battery pack, which includes a battery module, a motor control system and a conductive component 2, wherein the conductive component 2 is any of the conductive components 2 described above, and the conductive component 2 connects the battery module and the motor control system.

[0099] In an embodiment of the present application, one end of the conductive component 2 can be electrically connected to the battery module through a wiring harness 3, and the other end can be electrically connected to the motor control system through a wiring harness 3, so that the conductive component 2 can be connected in series in the circuit between the battery module and the motor control system for transmitting current.

[0100] During the operation of the battery pack, the battery module may generate a large amount of current when a short circuit or other adverse conditions occur, and the conductive component 2 will generate a large amount of heat when a large amount of current flows through it. The heat can cause the conductive component 2 to melt, thereby cutting off the current flow path to avoid safety problems caused by excessive current during the operation of the circuit, thereby protecting the wiring harness 3, battery module and motor control system in the circuit, which is beneficial to improving the safety of the battery pack during operation.

[0101] Among them, the conductive component 2 includes at least a first fuse zone 131 and a second fuse zone 132. By setting the first fuse zone 131 and the second fuse zone 132 to fuse in a preset order, there is a time difference in the fusing time between the two, so that the conductive component 2 can be selectively fused according to the intensity and duration of the current, and then different protection measures can be implemented in different fault conditions, which is conducive to further improving the versatility of the conductive component 2.

[0102] In a possible implementation, the battery pack may be a battery pack for an electric vehicle or a battery pack for an energy storage system.

[0103] The above describes in detail the structure, features and effects of the present application based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present application, but the present application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of the present application, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present application.

Claims

1. A conductive member, characterized in that: The conductive member includes at least one circuit board, the circuit board includes an insulating layer and a conductive layer, and the insulating layer and the conductive layer are stacked along the thickness direction of the conductive member; The insulating layer is provided with a first fusing area, and the conductive layer is provided with a second fusing area, wherein the first fusing area and the second fusing area are used to be fusing when the current flowing through the conductive component reaches a threshold value; The time when the first fuse zone is blown is t1, the time when the second fuse zone is blown is t2, and t1 and t2 satisfy t1<t2.

2. The conductive member according to claim 1, characterized in that The time t1 when the first fuse area is blown and the time t2 when the second fuse area is blown satisfy 10ms≤t2-t1≤50ms.

3. The conductive member according to claim 1, characterized in that Along the thickness direction of the conductive component, projections of the first fuse region and the second fuse region are staggered.

4. The conductive member according to claim 1, characterized in that Each fuse area is provided with a plurality of through holes, and the plurality of through holes are distributed at intervals along a direction perpendicular to the transmission direction of the current.

5. The conductive member according to claim 4, characterized in that: A fuse portion is formed between adjacent through holes, and on the same insulating layer or the same conductive layer, the length, width and thickness of each fuse portion are equal.

6. The conductive member according to any one of claims 1 to 5, characterized in that: The material of the first fuse region is polyimide, and the material of the second fuse region is copper.

7. The conductive member according to any one of claims 1 to 5, characterized in that: The resistance of each fuse zone is R, and R satisfies 0.5Ω≤R≤150Ω, and / or the thickness of each fuse zone is h, and h satisfies 0.1mm≤h≤0.5mm.

8. The conductive member according to any one of claims 1 to 5, characterized in that: The conductive component includes a plurality of circuit boards, and along the thickness direction of the conductive component, the plurality of circuit boards are stacked, and projections of the first fuse zones of adjacent circuit boards at least partially overlap, and projections of the second fuse zones at least partially overlap; The number of layers of the circuit board is N, and N satisfies 2≤N≤10.

9. The conductive member according to claim 8, characterized in that Along the fusing order of the insulating layers, the thickness of the fusing zones of the multiple insulating layers increases successively, along the fusing order of the conductive layers, the resistance of the fusing zones of the multiple insulating layers decreases successively, or, the thickness of the fusing zones of the multiple insulating layers increases successively.

10. The conductive member according to any one of claims 1 to 5, characterized in that: The insulating layer and the conductive layer further include non-fusing areas, and along the current transmission direction, each of the non-fusing areas is located on both sides of each of the fusing areas; Wherein, in the insulating layer, the thickness of the fuse region is smaller than the thickness of the non-fuse region, and in the conductive layer, the thickness of the fuse region is larger than the thickness of the non-fuse region.

11. A battery pack, characterized in that: The battery pack includes a battery module, a motor control system and a conductive component, wherein the conductive component is the conductive component described in any one of claims 1 to 9, and the conductive component connects the battery module and the motor control system.

Images