Connection strip and battery

Abstract

This utility model provides a connector and a battery. The connector includes two conductive parts and a connecting part between the conductive parts. The conductive parts are used for electrical connection with the battery terminals. The connecting part includes multiple conductive wires. The cross-sectional area of ​​each conductive wire is small, making it prone to local melting under abnormal current. This improves the melting sensitivity of the connecting part and enhances the battery's safety under fault conditions such as overload or short circuit. Furthermore, the resistance per unit length of the connecting part is less than or equal to the resistance per unit length of the conductive parts. This makes it less likely for the connecting part to form localized hot spots during battery operation, ensuring that the current carrying capacity of the connecting part is greater than or equal to the current carrying capacity of the conductive parts. This avoids localized heating problems caused by high resistance in the connecting part under normal operating conditions, reduces the risk of heat accumulation, and improves the thermal stability and reliability of the connector.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, specifically to a connector and a battery. Background Technology

[0002] As power battery systems develop towards higher energy density and higher current carrying capacity, the aluminum busbar, as a key conductive component of the battery module, directly affects the safety performance of the battery pack due to its structural reliability. In related technologies, the aluminum busbar structure is typically formed from a single aluminum sheet through stamping or machining, with an arch bridge structure in the middle section to improve its flexibility in the face of thermal expansion and contraction or mechanical deformation of individual cells. To further enhance the safety of the battery pack under abnormal conditions such as short circuits or overloads, through-holes can be incorporated into the arch bridge section to reduce its current carrying capacity and guide the circuit to melt preferentially in the event of abnormal current, thereby protecting the individual cells.

[0003] However, the through-hole structure weakens the conductive path of the arch bridge section, thereby reducing the current-carrying capacity of the aluminum busbar. This results in the arch bridge section exhibiting higher resistance during normal battery operation, making it prone to significant Joule heating when current flows through, causing localized overheating problems. Heat accumulation not only affects the long-term stability of the structure but may also become a risk source for inducing thermal runaway, thus increasing the risk of battery pack overload. Utility Model Content

[0004] The present invention provides a connector and a battery to achieve directional fuse protection against overload faults without reducing the conductivity of the connector, thereby avoiding the technical problem of local overheating and overload risk caused by the weakening of the connector's current carrying capacity.

[0005] To achieve the above functions, the technical solution provided in this embodiment is as follows:

[0006] In a first aspect, this embodiment provides a connecting bar, including a connecting bar body, the connecting bar body comprising:

[0007] Two conductive parts are disposed opposite each other along a first direction, and the conductive parts are configured to be electrically connected to the terminals of the battery;

[0008] A connecting portion is provided between the two conductive portions. The connecting portion includes multiple conductive wires, and the resistance per unit length of the connecting portion is less than or equal to the resistance per unit length of the conductive portion.

[0009] According to one embodiment of the present invention, along a reference plane parallel to the second direction and the third direction, the cross-sectional area of ​​the outer contour of the connecting portion is greater than or equal to the cross-sectional area of ​​the conductive portion; wherein the second direction and the third direction are intersecting each other, and both the second direction and the third direction are perpendicular to the first direction.

[0010] According to one embodiment of the present invention, the conductive part is made of aluminum, and the connecting part is made of a metal material with a higher conductivity than aluminum.

[0011] According to one embodiment of the present invention, along a reference plane parallel to the second direction and the third direction, the cross-sectional area of ​​the outer contour of the connecting part is less than or equal to the cross-sectional area of ​​the conductive part; wherein, the second direction and the third direction are intersecting each other, and both the second direction and the third direction are perpendicular to the first direction.

[0012] According to one embodiment of the present invention, the connecting bar further includes two connecting sub-parts, and the two ends of the connecting sub-parts are respectively connected to the two conductive parts through the two connecting sub-parts;

[0013] Wherein, the resistance of the connecting sub-part is greater than the resistance of the conductive part, and the resistance of the connecting sub-part is greater than the resistance of the connecting part.

[0014] According to one embodiment of the present invention, multiple conductive wires are interwoven to form a mesh structure, and at least some of the conductive wires are connected to two conductive parts at both ends.

[0015] According to one embodiment of the present invention, the connecting portion includes two first connecting sub-parts, wherein one of the conductive portions is connected to the other conductive portion in sequence through the two first connecting sub-parts.

[0016] According to one embodiment of the present invention, in the connected conductive portion and the first connecting sub-part, the line width of the conductive wire on the side closer to the conductive portion is greater than the line width of the conductive wire on the side farther from the conductive portion.

[0017] According to one embodiment of the present invention, the mesh structure of the connecting part is provided with a plurality of through holes, and in the connected conductive part and the first connecting sub-part, the diameter of the through hole closer to the conductive part is larger than the diameter of the through hole farther away from the conductive part.

[0018] According to one embodiment of the present invention, the connecting bar further includes a protective layer, which at least covers the outer side surface of the connecting portion.

[0019] Secondly, this utility model also provides a battery, including the connecting bar described in the first aspect embodiment.

[0020] The beneficial effects of the embodiments of this utility model are as follows: This utility model provides a connector and a battery. The connector includes two conductive parts and a connecting part between the conductive parts. The conductive parts are used for electrical connection with the battery terminals. The connecting part includes multiple conductive wires. The cross-sectional area of ​​each conductive wire is small, making it easy to partially melt under abnormal current, thereby improving the melting sensitivity of the connecting part and enhancing the safety of the battery under fault conditions such as overload or short circuit. Furthermore, the unit length resistance of the connecting part is less than or equal to the unit length resistance of the conductive parts, making it less likely for the connecting part to form local hot spots during battery operation. This ensures that the current carrying capacity of the connecting part is greater than or equal to the current carrying capacity of the conductive parts, thereby avoiding the problem of local heating caused by high resistance in the connecting part under normal operating conditions, reducing the risk of heat accumulation, and improving the thermal stability and reliability of the connector. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the description of the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the connecting bar provided in an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the first structure of the connecting bar body provided in an embodiment of the present utility model;

[0024] Figure 3 Provided for the embodiments of this utility model Figure 2 A top view of the connecting bar body in the diagram;

[0025] Figure 4 Provided for the embodiments of this utility model Figure 3 Enlarged view of point A in the middle;

[0026] Figure 5 This is a schematic diagram of a second structure of the connecting bar body provided in an embodiment of the present utility model;

[0027] Figure 6 This is a schematic diagram of the battery structure provided in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Connecting bar; 11-Connecting bar body; 12-Protective layer; 111-Conductive part; 112-Connecting part; 1121-Conductive wire; 1120-Mesh structure; 1120A-Through hole; 113-Connecting sub-part; 1122-First connecting sub-part; X-First direction; Y-Second direction; Z-Third direction; 2-Battery; 21-Battery casing; 22-Cover plate assembly. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, 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.

[0031] This embodiment provides a connecting bar 1. Please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 and Figure 4 ;in, Figure 1 This is a schematic diagram of the connecting bar provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the first structure of the connecting bar body provided in an embodiment of the present utility model; Figure 3 Provided for the embodiments of this utility model Figure 2 A top view of the connecting bar body in the diagram; Figure 4 Provided for the embodiments of this utility model Figure 3 Enlarged schematic diagram at point A; the connecting bar 1 includes a connecting bar body 11 and a protective layer 12. The connecting bar body 11 includes two conductive parts 111 and a connecting part 112 connecting the two conductive parts 111.

[0032] The two conductive parts 111 are arranged opposite each other along the first direction X and are configured to be electrically connected to the positive and negative terminals of the battery 2, thereby realizing the conductive series or parallel connection of multiple battery cells; the connecting part 112 is disposed between the two conductive parts 111, and is used to carry the working current under normal operating conditions, and at the same time to realize directional melting when the current is abnormal, thereby blocking the fault current and improving the overall safety of the battery 2; wherein, the first direction X can be the length direction of the connecting row 1.

[0033] The protective layer 12 at least covers the outer surface of the connecting portion 112. Depending on the material of the protective layer 12, it can have different effects. For example, if a coating material with insulating properties is selected, the protective layer 12 can suppress heat dissipation from the surface of the connecting portion 112 while improving its oxidation resistance. It can further enhance heat accumulation under overload through local thermal resistance effect, ensure priority of melting, and enhance the long-term stability of the structure. Alternatively, if a nickel sheet or other metal cladding layer with oxidation resistance is selected, the protective layer 12 can be set on the outside of the connecting portion 112 to form environmental isolation and structural protection for the connecting portion 112 without affecting its melting function. This improves the environmental adaptability and structural safety of the connecting busbar 1, thereby enhancing the stability and reliability of the connecting portion 112 under high current carrying and melting operation modes.

[0034] Specifically, the connecting part 112 includes multiple conductive wires 1121, and at least two ends of the conductive wires 1121 are respectively connected to two conductive parts 111. Since the multiple conductive wires 1121 are not integrally connected, each conductive wire 1121 can deform relatively independently when thermally expanded or subjected to mechanical stress, thereby reducing the displacement constraint between adjacent conductive wires 1121. This causes the stress distribution to gradually change from a concentrated form to a dispersed transmission form along multiple paths, reducing the local stress concentration problem caused by the uneven deformation of the connecting part 112 as a whole, avoiding the accumulation of local plastic deformation, and improving the mechanical stability and service life of the connecting part 112 under complex working conditions.

[0035] Meanwhile, since the cross-sectional area of ​​each conductive wire 1121 constituting the connection portion 112 is relatively small, when the battery 2 experiences an overload or short circuit, some of the conductive wires 1121 will rapidly heat up due to a significant increase in current density, forming melting points. As some of the conductive wires 1121 melt, the original current path is cut off, and the current is forced to be redistributed to the adjacent unmelted conductive wires 1121, leading to a further increase in the current density of the adjacent conductive wires 1121, triggering new local melting, and gradually forming a chain-like melting mechanism. This mechanism makes the connection portion 112 directional and predictable during the failure process, effectively cutting off the fault current, protecting the battery 2 terminals and related structures from high-temperature damage, and improving the safety of the battery 2.

[0036] Furthermore, in this embodiment, the resistance per unit length of the connecting portion 112 is less than or equal to the resistance per unit length of the conductive portion 111. It should be noted that the resistance per unit length refers to the resistance value of the conductor per unit length, calculated using the formula: r = 1 / (σA), where σ is the conductivity of the conductor, and A is the cross-sectional area of ​​the conductive path. The resistance per unit length is one of the key parameters affecting the current-carrying capacity of a conductor.

[0037] The "current-carrying capacity" refers to the amount of current that a unit structure can stably carry within a limited voltage drop and allowable temperature rise range. This capacity is affected by various factors such as the conductivity of the material, cross-sectional area, and structural layout. If the current-carrying capacity of the connection part 112 is insufficient, it will usually manifest as a high resistance per unit length, generating significant Joule heating under continuous operating current. This leads to heat accumulation in localized areas, making it difficult to dissipate heat in a timely manner, increasing the risk of heat accumulation in the conductor, and potentially inducing thermal runaway, affecting the conductor's stability and service life.

[0038] Based on the above principles, it can be understood that by setting the resistance per unit length of the connecting part 112 to be less than or equal to the resistance per unit length of the conductive part 111, the connecting part 112 will not become a high-resistance area on the current path during the operation of the battery 2, thus avoiding the formation of local heat points on the connecting part 112 and ensuring that the current is more evenly distributed in the connecting bar 1.

[0039] Meanwhile, under similar heat dissipation conditions, since the connection part 112 has a smaller resistance per unit length, its thermal resistance is lower and its current carrying capacity is stronger. This reduces the risk that the connection part 112 will become a "current bottleneck" or "thermal runaway trigger point" under high current conditions, thereby improving the thermal stability and operational reliability of the connection bus 1. During normal operation of the battery 2, the current can be more evenly distributed in various areas of the connection bus 1, improving the thermal stability and safety of the connection bus 1 under high current conditions.

[0040] Please continue to combine Figures 1 to 4 In one embodiment, multiple conductive wires 1121 are wavy and interwoven to form a mesh structure 1120, thereby improving the morphological stability of the connection portion 112.

[0041] Specifically, the wave-like weaving causes the conductive wires 1121 to exhibit a periodic undulating waveform in their extension direction. At each intersection, the crest of one conductive wire 1121 interlocks with the trough of another conductive wire 1121, thereby constructing an interlocking structure within the plane of the connecting portion 112. This structure helps to suppress relative slippage between adjacent conductive wires 1121 during stress, enhancing the shear deformation resistance of the connecting portion 112. Simultaneously, the three-dimensional interlocking network formed by the interlaced weaving can disperse external forces to multiple conductive wires 1121 through the elastic deformation path of the geometric waveform, reducing the risk of a single conductive wire 1121 breaking due to stress concentration, thereby improving the mechanical reliability and deformation buffering capacity of the connecting portion 112.

[0042] Furthermore, along the reference plane (YZ plane) formed by the second direction Y and the third direction Z, the cross-sectional area of ​​the outer contour of the connecting part 112 is greater than or equal to the cross-sectional area of ​​the conductive part 111, thereby making the resistance per unit length of the connecting part 112 less than or equal to the resistance per unit length of the conductive part 111; wherein, the second direction Y and the third direction Z are intersecting each other, and both the second direction Y and the third direction Z are perpendicular to the first direction X, the second direction Y can be the width direction of the connecting row 1, and the third direction Z can be the thickness direction of the connecting row 1.

[0043] It should be noted that the "outer contour cross-sectional area of ​​the connecting part 112" refers to the area of ​​the plane corresponding to the connecting part 112 enclosed by a complete geometric shape that is as small as possible. The outer contour cross-sectional area includes the sum of the cross-sectional areas of all the conductive wires 1121 constituting the connecting part 112 and the gap area between the conductive wires 1121.

[0044] Specifically, the connecting part 112 and the conductive part 111 can be made of the same metal material, such as aluminum or aluminum alloy, which are commonly used conductor materials. By setting the material of the connecting part 112 to be the same as that of the conductive part 111, the conductivity of the material of the connecting part 112 is equal to that of the material of the conductive part 111.

[0045] It should be noted that, since the connecting part 112 is a braided structure, there are certain gaps between adjacent conductive wires 1121 inside the connecting part 112, resulting in the actual cross-sectional area of ​​the connecting part 112 being smaller than the solid metal cross-sectional area of ​​the conductive part 111. To avoid the increase in resistance per unit length of the connecting part 112, this embodiment sets the outer contour cross-sectional area of ​​the connecting part 112 to be greater than or equal to the cross-sectional area of ​​the conductive part 111. This ensures that, under the condition that the materials of the connecting part 112 and the conductive part 111 are the same, the resistance per unit length of the connecting part 112 is less than or equal to the resistance per unit length of the conductive part 111. This avoids the additional voltage drop and heat accumulation problems caused by local high resistance in the connecting part 112, further improving the electrical stability and structural safety of the connecting bus 1.

[0046] It is understandable that, since the maximum resistance in the entire conductive path is not concentrated in the connection part 112, the current can be more evenly distributed in all parts of the connection bar 1 when the battery 2 is working normally. This will prevent the formation of obvious voltage drop concentration or local heating area in the connection part 112, thereby reducing the risk of temperature rise and thermal runaway caused by high local resistance and improving the overall thermal stability and safety of the connection bar 1.

[0047] Please continue to combine Figures 1 to 4 In one embodiment, the connecting strip 1 further includes two connecting sub-parts 113, and the two ends of the connecting part 112 are respectively connected to the two conductive parts 111 through the two connecting sub-parts 113; wherein, the resistance of the connecting sub-part 113 is greater than the resistance of the conductive part 111, and the resistance of the connecting sub-part 113 is greater than the resistance of the connecting part 112.

[0048] It should be noted that, according to Joule's law of heating, the amount of heat generated in a conductor under current-carrying conditions is Q = I. 2 Rt, where Q is the heat generated per unit time, I is the load current, R is the resistance, and t is the current carrying time. It can be seen that under the same current and working time conditions, the greater the resistance of the conductor, the more obvious its temperature rise.

[0049] Understandably, when the connector 1 is operating normally, the connector sub-part 113 will exhibit a relatively higher operating temperature due to its higher resistance. However, when an abnormal current situation such as overload or short circuit occurs, the connector sub-part 113 will reach the melting temperature first due to its faster local heat accumulation, thereby forming a local melting point at that location. This achieves controllable circuit breaking protection for the entire connector 1, thereby preventing the melting point of the connector 1 from being close to the battery 2 terminal (i.e., preventing damage to the terminal structure caused by the high-temperature melting of the conductive part 111). This keeps the melting area away from the core cell part, avoids damage to the terminal structure, reduces the risk of heat diffusion, and improves the safety of the battery 2.

[0050] Specifically, the connecting part 112 and the conductive part 111 can be connected by laser welding. A transition section is formed between the two through laser welding, constituting the connecting sub-part 113. The material of the connecting part 112 is copper, and the material of the conductive part 111 is aluminum. Copper and aluminum are dissimilar metals, and direct welding between them easily forms intermetallic compounds at the interface. These compounds are brittle and have low electrical conductivity, making it easier for a high-resistance layer (connecting sub-part 113) to form in the welded area compared to the connecting part 112 and the conductive part 111. At the same time, the rapid heating and cooling during laser welding will cause grain coarsening, uneven structure, and residual stress superposition, thereby further increasing the resistance of the connecting sub-part 113.

[0051] Under normal operating conditions of battery 2, the connector 113 will generate weak but continuous Joule heat, which can be rapidly conducted and diffused through the high thermal conductivity path of the connector 112. At the same time, due to the electrochemical potential difference between copper and aluminum, when the copper-aluminum interface is in a humid environment or under electrolyte conditions such as electrolyte residue, slow electrochemical corrosion and oxidation reactions are likely to occur, which will further increase the local resistance of the connector 113.

[0052] As mentioned above, when battery 2 is under abnormal operating conditions such as overload or short circuit, the resistance of the connecting sub-part 113 is significantly higher than that of the adjacent parts. According to Joule's law, the connecting sub-part 113 will become the position in the connecting row 1 that is most likely to heat up and reach the melting condition first. Combined with the interface fragility caused by interface corrosion and oxidation during long-term operation, the connecting sub-part 113 finally achieves a rapid and directional melting protection function.

[0053] Please continue to combine Figures 1 to 4 In one embodiment, the connecting portion 112 includes two first connecting sub-portions 1122, wherein one conductive portion 111 is connected to the other conductive portion 111 in sequence through the two first connecting sub-portions 1122; wherein, in the connected conductive portion 111 and the first connecting sub-portions 1122, the line width of the conductive wire 1121 on the side closer to the conductive portion 111 is greater than the line width of the conductive wire 1121 on the side farther away from the conductive portion 111, thereby making the connecting portion 112 exhibit a distribution structure in which the line width of the conductive wire 1121 gradually increases from the middle region to the two sides.

[0054] It is understandable that, since the larger the line width of the conductive wire 1121, the larger its cross-sectional area and the corresponding increase in its heat dissipation specific surface area, by setting the line width of the conductive wire 1121 on the side closer to the conductive part 111 to be greater than the line width of the conductive wire 1121 on the side farther from the conductive part 111 in the connected conductive part 111 and the first connecting sub-part 1122, the side of the conductive wire 1121 closer to the conductive part 111 has better heat dissipation, thereby enhancing the heat dissipation conduction effect between the connecting part 112 and the conductive part 111, so that the heat generated by the battery 2 during normal operation can be further dissipated, reducing the local temperature rise of the connecting part 112, and improving the thermal stability and operational safety of the connecting bus 1.

[0055] Meanwhile, when battery 2 experiences abnormal operating conditions such as overload or short circuit, the middle region of the connection portion 112 is located in the inner region where heat flow is concentrated due to its distance from the external heat dissipation path, resulting in relatively poor heat dissipation conditions. By setting the line width of the conductive wire 1121 on the side away from the conductive part 111 to be smaller than the line width of the conductive wire 1121 on the side close to the conductive part 111 in the connected conductive part 111 and the first connecting sub-part 1122, the current density per unit cross-sectional area of ​​the conductive wire 1121 in the middle region of the connection portion 112 is increased, making it easier for Joule heat to accumulate. This causes the local temperature to rise rapidly in a short time and melt first, forming the initial break point. As the conductive path in this part is interrupted, the current will be redistributed to the thicker conductive wires 1121 on both sides of the connection portion 112, allowing them to bear a larger current and further increasing the current density, which in turn triggers a new local melt, gradually advancing the chain melt process, thereby protecting the battery 2's terminal structure from high-temperature damage and improving the operational safety and engineering reliability of the battery 2.

[0056] Furthermore, the mesh structure 1120 of the connecting portion 112 is provided with a plurality of through holes 1120A, and in the connected conductive portion 111 and the first connecting sub-portion 1122, the aperture of the through hole 1120A near the conductive portion 111 is larger than the aperture of the through hole 1120A away from the conductive portion 111, thereby making the connecting portion 112 exhibit a distribution structure in which the aperture of the through hole 1120A gradually increases from the middle region to the two sides.

[0057] Specifically, since the larger the diameter of the through hole 1120A, the larger the gap between adjacent conductive wires 1121 will be, thus providing a better heat dissipation channel and improving the heat dissipation performance of the corresponding part of the connection portion 112; therefore, by setting the diameter of the through hole 1120A near the conductive portion 111 to be larger than the diameter of the through hole 1120A away from the conductive portion 111 in the connected conductive portion 111 and the first connecting sub-part 1122, the side of the first connecting sub-part 1122 near the conductive portion 111 has a stronger heat dissipation capacity, which can effectively diffuse the heat generated in the interface area between the connection portion 112 and the conductive portion 111 during normal operation of the battery 2, reduce the local temperature rise in this area, further improve the thermal stability and electrical operation safety of the connection bus 1, and avoid structural damage or safety hazards caused by heat accumulation near the battery 2 terminals.

[0058] Meanwhile, when the battery 2 experiences abnormal operating conditions such as overload or short circuit, by setting the aperture of the through hole 1120A away from the conductive part 111 to be smaller than the aperture of the through hole 1120A close to the conductive part 111 in the connected conductive part 111 and the first connecting sub-part 1122, the heat dissipation effect of the middle region of the connecting part 112 is reduced, making it easier for the middle region of the connecting part 112 to accumulate heat. When the current rises sharply in a short time, this region heats up faster and melts first due to limited heat dissipation, forming an initial break point. This helps to limit the melting behavior to the part of the connecting part 112 away from the battery 2 terminal, avoiding problems such as material melting, deformation or contact failure caused by the battery 2 terminal being directly exposed to high temperature, and further improving the structural safety and response controllability of the battery 2 under overload failure conditions.

[0059] Please combine Figure 1 and Figure 5 In one embodiment, the connecting part 112 is made of copper or other metals with higher conductivity than aluminum, while the conductive part 111 can be made of common conductive materials such as aluminum or aluminum alloys. Since the connecting part 112 and the conductive part 111 are made of different materials, and the conductivity of copper is significantly higher than that of aluminum, the conductivity of the material of the connecting part 112 is greater than that of the material of the conductive part 111.

[0060] Furthermore, along the reference plane (YZ plane) formed by the second direction Y and the third direction Z, the cross-sectional area of ​​the outer contour of the connecting part 112 is smaller than the cross-sectional area of ​​the conductive part 111. Since the conductor's resistance per unit length, the conductor's conductivity, and the conductor's cross-sectional area satisfy the relationship: r = 1 / (σA), where r is the conductor's resistance per unit length, σ is the conductor's conductivity, and A is the conductor's cross-sectional area; therefore, although the cross-sectional area of ​​the connecting part 112 is smaller than the cross-sectional area of ​​the conductive part 111, by selecting a material with higher conductivity (e.g., copper), the resistance increase trend caused by the reduction in cross-sectional area of ​​the connecting part 112 can be effectively compensated, and the resistance per unit length of the connecting part 112 can be less than or equal to the resistance per unit length of the conductive part 111.

[0061] It is understood that this embodiment improves the conductive path by increasing the material conductivity, thereby ensuring that the connection part 112 has a current carrying capacity equivalent to or higher than that of the conductive part 111, suppressing the local heating problem caused by the high resistance of the connection part 112 under normal operating current, controlling the local heating of the connection part 112 during operation, and improving the electrical safety and thermal stability of the connection bus 1.

[0062] Meanwhile, by setting the outer contour cross-sectional area of ​​the connecting part 112 to be smaller than the cross-sectional area of ​​the conductive part 111, the internal space of the battery 2 is saved, the structural integration is improved, and the material usage and manufacturing cost are reduced, which provides favorable support for realizing the miniaturization and lightweight design of the battery 2.

[0063] Please continue, please combine Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 This embodiment also provides a battery 2, including a battery casing 21, a cell assembly (not shown in the figure), a protective film (not shown in the figure), a cover plate assembly 22, and the connection bar 1 described in any of the above embodiments.

[0064] The battery casing 21 has a mounting cavity; the battery cell assembly is installed in the mounting cavity, and the battery cell assembly includes multiple battery cells; the connecting bar 1 is used to realize the conductive connection between the battery cell terminals, and when the battery 2 experiences an overload fault, the abnormal current is blocked by the directional melting of the connecting part 112, thereby improving the safety of the battery 2; the protective film is located in the mounting cavity and covers the outer surface of the battery cell assembly; the cover plate assembly 22 is used to seal the mounting cavity.

[0065] It is understood that the connection bar 1 has been described in detail in the above embodiments and will not be repeated here; in particular, since the battery 2 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated here.

[0066] It should be noted that the type of battery 2 can be flexibly selected according to the needs of the actual application scenario, and the battery 2 can be adapted to a variety of electrical devices. Specifically, since the battery 2 provided in this embodiment has the characteristics of stable structure and high assembly precision, it can meet the differentiated performance requirements of different electrical devices for the battery 2. Therefore, the electrical devices can include, but are not limited to, at least one of vehicles, energy storage power supplies, consumer electronics, medical devices, or smart city devices. In this embodiment, the specific type of electrical device is not limited, and can be adapted and selected according to the actual application scenario.

[0067] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. 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 utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A connecting bar (1), characterized in that, Includes a connecting bar body (11), the connecting bar body (11) comprising: Two conductive parts (111) are disposed opposite each other along a first direction, and the conductive parts (111) are configured to be electrically connected to the terminals of the battery (2); A connecting part (112) is connected between two conductive parts (111). The connecting part (112) includes multiple conductive wires (1121), and the resistance per unit length of the connecting part (112) is less than or equal to the resistance per unit length of the conductive part (111).

2. The connecting bar (1) according to claim 1, characterized in that, Along a reference plane parallel to the second direction and the third direction, the cross-sectional area of ​​the outer contour of the connecting part (112) is greater than or equal to the cross-sectional area of ​​the conductive part (111); wherein the second direction and the third direction are intersecting each other, and both the second direction and the third direction are perpendicular to the first direction.

3. The connecting bar (1) according to claim 1, characterized in that, The conductive part (111) is made of aluminum, and the connecting part (112) is made of a metal material with a higher conductivity than aluminum.

4. The connecting bar (1) according to claim 3, characterized in that, Along a reference plane parallel to the second direction and the third direction, the cross-sectional area of ​​the outer contour of the connecting part (112) is less than or equal to the cross-sectional area of ​​the conductive part (111); wherein the second direction and the third direction are intersecting each other, and both the second direction and the third direction are perpendicular to the first direction.

5. The connecting bar (1) according to claim 3, characterized in that, The connecting bar (1) further includes two connecting sub-parts (113), and the two ends of the connecting part (112) are respectively connected to the two conductive parts (111) through the two connecting sub-parts (113); The resistance of the connecting sub-part (113) is greater than the resistance of the conductive part (111), and the resistance of the connecting sub-part (113) is greater than the resistance of the connecting part (112).

6. The connecting bar (1) according to any one of claims 1 to 5, characterized in that, Multiple conductive wires (1121) are interwoven to form a mesh structure (1120), and at least some of the conductive wires (1121) are connected to two conductive parts (111) at both ends.

7. The connecting bar (1) according to claim 6, characterized in that, The connecting part (112) includes two first connecting sub-parts (1122), one of the conductive parts (111) is connected to the other conductive part (111) in sequence through the two first connecting sub-parts (1122).

8. The connecting bar (1) according to claim 7, characterized in that, In the connected conductive portion (111) and the first connecting sub-portion (1122), the line width of the conductive wire (1121) on the side closer to the conductive portion (111) is greater than the line width of the conductive wire (1121) on the side farther away from the conductive portion (111).

9. The connecting bar (1) according to claim 7, characterized in that, The mesh structure (1120) of the connecting part (112) is provided with a plurality of through holes (1120A), and in the connected conductive part (111) and the first connecting sub-part (1122), the diameter of the through hole (1120A) closer to the conductive part (111) is larger than the diameter of the through hole (1120A) farther away from the conductive part (111).

10. The connecting bar (1) according to any one of claims 1 to 5, characterized in that, The connecting row (1) further includes a protective layer (12), which at least covers the outer side of the connecting part (112).

11. A battery (2), characterized in that, Includes the connecting row (1) as described in any one of claims 1 to 10.

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