Shunt, power distribution device, energy storage device and electrical equipment

Abstract

The application provides a shunt, a power distribution device, an energy storage device and an electric equipment, and relates to the technical field of batteries. The shunt comprises a main row, a transition connection row and a sampling circuit board. The main row comprises an alloy base and a connecting part connected with the alloy base. The connecting part and part of the alloy base are composed of the same components. The transition connection row is welded with the connecting part. The transition connection row and the connecting part are composed of different materials. The transition connection row is used for connecting an external circuit. At least part of the transition connection row and a connecting terminal of the external circuit are composed of the same components. The shunt provided by the application is beneficial to reducing the risk of primary cell corrosion at the connection between the shunt and the external circuit, and prolonging the service life of the shunt.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a shunt, power distribution device, energy storage device and electrical equipment. Background Technology

[0002] A shunt is an indispensable part of a battery management system, used to monitor the battery's recharge status in real time, ensuring battery safety and optimizing battery performance. In a battery system, the shunt is connected in series with the main circuit to detect the total current. Specifically, the shunt has two current terminals: one connected to the positive conductor of the battery pack, and the other connected to the negative input terminal of the load.

[0003] In the prior art, in order to save on the production cost of battery packs, when connecting the battery circuit to the shunt, the circuit terminals are made of aluminum busbars, while the shunt terminals are made of copper. The copper terminals and aluminum busbars are electrically connected through a detachable mechanical connection.

[0004] The above methods make both cells more susceptible to galvanic corrosion, shortening their lifespan, and increasing the contact resistance at the connection point, resulting in greater heat generation. Summary of the Invention

[0005] In view of the above problems, this application provides a shunt, a power distribution device, an energy storage device, and an electrical device, which helps to reduce the risk of galvanic corrosion at the connection between the shunt and the external circuit and extend the service life of the shunt.

[0006] On one hand, this application provides a shunt, comprising: a main busbar, including an alloy substrate and a connecting portion connected to the alloy substrate, wherein the connecting portion has a portion of the same composition as the alloy substrate; and a transition connecting busbar, welded to the connecting portion, wherein the transition connecting busbar is made of a different material than the connecting portion, the transition connecting busbar is used to connect to an external circuit, and at least a portion of the components of the transition connecting busbar are the same as the connection terminals of the external circuit.

[0007] In one possible implementation, the transition connection bar includes a transition connection bar with connection holes for external circuit connection terminals to pass through, so that the transition connection bar mates with and is welded to the connection terminal holes for external circuits.

[0008] In one possible implementation, the transition connection bar is provided with riveting holes for riveting and welding to the connection terminals of an external circuit via rivets.

[0009] In one possible implementation, the transition connection bar is adapted to be connected to the connection terminals of an external circuit using laser deep penetration welding or laser penetration welding.

[0010] In one possible implementation, the welding trajectory between the transition connection bus and the external circuit is circular or elliptical.

[0011] In one possible implementation, there are at least two connecting portions, and the number of transition connecting rows corresponds to the number of connecting portions.

[0012] In one possible implementation, there are two transition connection rows. One of the two transition connection rows is provided with a connection hole to mate with and weld to the connection terminal hole of the external circuit, and the other is provided with a riveting hole for riveting and welding to the connection terminal of the external circuit via a rivet.

[0013] In one possible implementation, the connecting portion and the transition connecting row are stacked and welded together.

[0014] In one possible implementation, both the alloy substrate and the connecting portion have a first surface along the thickness direction, and there is a height difference between the first surface of the alloy substrate and the first surface of the connecting portion; the transition connecting row has a connecting mating portion, which is stacked and connected to the connecting portion, and the first surface of the connecting mating portion is flush with the first surface of the alloy substrate.

[0015] In one possible implementation, the connecting portion and the transition connecting block are welded using one of electromagnetic pulse welding, ultrasonic welding, or brazing.

[0016] In one possible implementation, the alloy matrix further has a second surface opposite to the first surface along the thickness direction, and the shunt further includes a sampling circuit board disposed on the second surface and connected to the connection portion.

[0017] In one possible implementation, the alloy matrix is ​​a copper-manganese alloy; the connecting part is made of copper metal; and the transition connecting strip is made of aluminum metal.

[0018] Secondly, this application provides a power distribution device, including the aforementioned shunt.

[0019] Thirdly, this application provides an energy storage device, including: an energy storage module; the aforementioned shunt, wherein the power distribution device is electrically connected to the energy storage module and an external power-consuming device respectively.

[0020] Fourthly, this application provides an electrical device, including an electrical device and the aforementioned energy storage device, wherein the electrical device is electrically connected to the energy storage device.

[0021] The shunt, power distribution device, energy storage device, and electrical equipment provided in this application include a shunt with a main busbar and a transition connection busbar. The connection part of the main busbar is electrically connected to an external circuit through the transition connection busbar, thereby connecting the shunt in series with the external circuit to achieve current monitoring of the external circuit. Furthermore, the transition connection busbar and the connection part are made of different materials and are connected by welding. This allows the transition connection busbar and the connection part to be integrated at the molecular and atomic microscopic level, thus avoiding galvanic reactions between them and slowing down the corrosion rate of the transition connection busbar and the connection part. In addition, the transition connection busbar can be made of the same material as the connection terminals of the external circuit, thereby avoiding galvanic reactions, extending the service life of the shunt, and improving the reliability of the energy storage device and electrical equipment. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is an exploded view of the structure of the shunt in an embodiment of this application;

[0024] Figure 2 This is a diagram showing the usage state of the shunt in an embodiment of this application;

[0025] Figure 3 for Figure 2 A structural diagram from another angle;

[0026] Figure 4 This is a schematic diagram of the welding trajectory of the shunt in an embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the welding trajectory of a shunt in another embodiment of this application.

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

[0029] 100-Splitter;

[0030] 110 - Main row; 111 - Alloy matrix; 112 - Connecting part;

[0031] 120 - Transition connecting strip; 121 - Connecting hole; 122 - Riveting hole; 123 - Welding trajectory; 124 - Connecting mating part;

[0032] 130 - Sampling circuit board;

[0033] 10 - Connection terminal. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0035] In existing technologies, to save on battery pack production costs, some battery packs use aluminum busbars as the positive electrode conductor and copper terminals as the current terminals of the shunt. The copper terminals and aluminum busbars are electrically connected via detachable mechanical connections such as bolts. However, this mechanical connection between the copper terminals and aluminum busbars makes them susceptible to galvanic corrosion. As the anode, the aluminum busbar rapidly forms an oxide film on its surface, increasing its thickness and contact resistance. This, in turn, generates significant Joule heat at the connection point, potentially burning out the shunt.

[0036] In view of this, this application provides a shunt, an energy storage device, and an electrical device. The shunt includes a main busbar and a transition connection busbar. The connection portion of the main busbar is electrically connected to an external circuit through the transition connection busbar, thereby connecting the shunt in series with the external circuit to achieve real-time monitoring of the current in the external circuit. Furthermore, the transition connection busbar and the connection portion are made of different materials and are connected by welding. This prevents the formation of a galvanic cell reaction between the transition connection busbar and the connection portion, which helps to slow down the corrosion rate of the transition connection busbar and the connection portion. In addition, the transition connection busbar can be made of the same material as the connection terminals of the external circuit, thereby avoiding galvanic cell reactions, which helps to extend the service life of the shunt and improve the reliability of the energy storage device and the electrical device.

[0037] It should be noted that the shunt provided in this application can be applied to various energy storage devices.

[0038] See Figures 1 to 3 As shown, this application embodiment provides a shunt 100, including: a main busbar 110, a transition connection busbar 120, and a sampling circuit board 130.

[0039] The main row 110 includes an alloy substrate 111 and a connecting part 112 connected to the alloy substrate 111, wherein the material of the connecting part 112 is the same as the material of some components of the alloy substrate 111.

[0040] The transition connection bus 120 is welded to the connection part 112. The transition connection bus 120 and the connection part 112 are made of different materials. The transition connection bus 120 is used to connect external circuits. At least some components of the transition connection bus 120 and the connection terminal 10 of the external circuit are the same.

[0041] In this embodiment, the connecting portion 112 of the transition connecting row 120 and the main row 110 are made of different materials. Therefore, in order to avoid a galvanic cell reaction between the transition connecting row 120 and the main row 110, the transition connecting row 120 and the connecting portion 112 need to be fixed together by welding. This makes the transition connecting row 120 and the connecting portion 112 integrated at the molecular and atomic microscopic level, thereby avoiding a galvanic cell reaction between the transition connecting row 120 and the connecting portion 112. This helps to slow down the corrosion rate of the transition connecting row 120 and the connecting portion 112, thereby extending the service life of the shunt 100 and improving the reliability of the shunt 100.

[0042] Meanwhile, the transition connection bus 120 and the connection terminal 10 of the external circuit share at least some components. In other words, they may only be partially the same, or they may be completely identical. For example, one of the transition connection bus 120 and the connection terminal 10 of the external circuit may be made of aluminum alloy, and the other may be made of aluminum; or both may be made of aluminum. In this way, the transition connection bus 120 and the connection terminal 10 can be connected together by mechanical crimping, bolting, or other methods. This allows for a rapid and stable electrical connection between the transition connection bus 120 and the connection terminal 10. Furthermore, because they are made of the same material, a galvanic cell reaction will not occur, thus avoiding corrosion or oxide film formation at the transition connection bus 120 or the connection terminal 10. This maintains a low contact resistance and helps ensure the safety and stability of the shunt 100.

[0043] Therefore, the shunt 100 provided in this application embodiment can reduce the possibility of galvanic cell reaction without affecting the convenience of the connection between the shunt 100 and the external circuit, thereby slowing down corrosion, maintaining a low contact resistance between the shunt 100 and the external circuit, which is beneficial to extending the service life of the shunt 100 and ensuring the continuous and stable operation of the shunt 100.

[0044] In addition, the number of transition connection bars 120 corresponds to the number of connection parts 112. The number of connection parts 112 can be set to at least two. The connection parts 112 are respectively connected to the positive and negative terminals of the external circuit through the transition connection bars 120. For example, when there are two connection parts 112, the two connection parts 112 are respectively located on opposite sides of the alloy substrate 111. The sampling circuit board is electrically connected to the two connection parts 112 respectively to realize the sampling and monitoring of the current. Alternatively, since the material of the connection part 112 is at least partially the same as that of the alloy substrate 111, the connection part 112 can also be set to one. In this case, the connection part 112 and the alloy substrate 111 are respectively connected to the positive and negative terminals of the external circuit. That is, the alloy substrate 111 can act as one of the connection parts 112. This application embodiment does not limit this and can make reasonable selection according to actual needs.

[0045] Optionally, the shunt 100 may also include a sampling circuit board 130, which is connected to the connection part 112. In a specific implementation, the sampling circuit board 130 is not in direct contact with the external circuit; the two are independent of each other. The sampling circuit board 130 is electrically connected to the connection part 112, thereby enabling the connection part 112 to sample, amplify, and digitize the current in the loop, achieving real-time monitoring of the current in the external circuit.

[0046] The specific materials of the alloy substrate 111, the connecting part 112 and the transition connecting row 120 are not limited in this application embodiment, as long as at least some components of the alloy substrate 111 are the same as those of the connecting part 112. This is beneficial to reduce contact resistance, reduce energy loss and heat generation, and improve the energy efficiency and measurement accuracy of the shunt 100.

[0047] For example, the alloy substrate 111 is a copper-manganese alloy; the connecting part 112 is made of copper metal; and the transition connecting strip 120 is made of aluminum metal.

[0048] Understandably, copper-manganese alloy has low resistivity, which allows for the production of milliohm-level resistors with high stability and low temperature drift, thus ensuring the accuracy of current measurement in shunt 100. The copper metal in the connection part 112 has even lower resistance, preventing the introduction of additional voltage drop or temperature rise errors. At the same time, copper metal has good thermal conductivity, which is conducive to rapid heat dissipation, reducing the internal temperature of shunt 100 and extending the service life of shunt 100.

[0049] Alternatively, the alloy matrix 111 can also be made of manganese-nickel-copper alloy, constantan, etc., and the connecting part 112 is made of copper metal. Manganese-nickel-copper alloy and constantan also have good conductivity and resistance stability, which can meet the measurement accuracy requirements of the shunt 100.

[0050] Furthermore, in order to save on the overall production cost of the energy storage device, the connection terminal 10 of the external circuit is made of aluminum. Therefore, in order to maintain the same material as the connection terminal 10, the transition connection bar 120 is also made of aluminum. In this way, no galvanic reaction will occur between the transition connection bar 120 and the connection terminal 10, which will help extend the service life of the shunt 100 and ensure the continuous, safe and stable operation of the shunt 100.

[0051] In addition, the connection part 112 and the transition connection bus 120 are welded using one of the following methods: electromagnetic pulse technology welding (EMPT), ultrasonic welding, and brazing. This application embodiment does not limit this method, and the appropriate method can be selected based on the specific materials of the connection part 112 and the transition connection bus 120. When the connection part 112 is made of copper and the transition connection bus 120 is made of aluminum, EMPT welding or ultrasonic welding can be used. Both of these welding methods are solid-state welding, which can seal the weld seam within the joint area between the transition connection bus 120 and the connection part 112, thereby preventing external electrolyte from entering the weld seam. The absence of an exposed copper-aluminum interface enables physical isolation of the galvanic cell circuit, which helps to reduce the corrosion rate at the connection between the transition connection bus 120 and the connection part 112, thereby extending the service life of the shunt 100 and ensuring the working performance of the shunt 100.

[0052] See also some of the possible implementation methods. Figures 1 to 3 As shown, the transition connection bar 120 of this application embodiment is provided with a connection hole 121. The connection hole 121 is used for the connection terminal 10 of the external circuit to pass through, so that the transition connection bar 120 and the connection terminal 10 of the external circuit form a hole-shaft fit and are welded.

[0053] In practical implementation, the external terminals are directly inserted into the pre-reserved connection holes 121 of the transition connection bar 120 and the holes are welded together with the shaft. A complete metallurgical weld is formed between the hole wall of the connection hole 121 and the connection terminal 10, which helps to expand the effective conductive cross-section and make the current path short and uniform. This reduces the contact resistance and heat generation between the transition connection bar 120 and the connection terminal 10, thus ensuring the working performance of the shunt 100. In addition, the shaft-hole fit and welding method helps to improve the tensile, shear, and vibration resistance of the connection, reduces the possibility of the shunt 100 loosening during operation, and thus improves the overall electrical stability and long-term reliability of the energy storage device.

[0054] See also some of the possible implementation methods. Figures 1 to 3 As shown, the transition connection bar 120 of this application embodiment is provided with a riveting hole 122, which is used to rivet and weld with the connection terminal 10 of the external circuit through a riveting piece.

[0055] In some embodiments, the connecting terminal 10 is first riveted through the riveting hole 122 on the transition connecting strip 120, and then the riveting area is partially fused and welded. This allows for the superposition of metallurgical welds on top of the high strength of mechanical riveting. Thus, a dual connection of riveting and welding is formed between the hole wall of the connecting hole 121 and the connecting terminal 10, changing the conductive path from point contact to full-circuit surface contact, which helps reduce resistance in the circuit. Furthermore, riveting helps eliminate assembly gaps between the transition connecting strip 120 and the connecting terminal 10, and welding is less likely to produce porosity or cracks, thereby improving the stability of the connection between the connecting terminal 10 and the connecting hole 121.

[0056] See also some of the possible implementation methods. Figures 1 to 3 As shown, the transition connection bar 120 of this application embodiment is adapted to be connected to the connection terminal 10 of the external circuit by laser deep penetration welding or laser penetration welding.

[0057] In practical implementation, laser deep penetration welding or laser through-welding produces welds with a large aspect ratio, narrow fusion zone, and small heat-affected zone, which helps reduce the joint resistance and temperature rise between the transition connection bus 120 and the connection terminal 10 of the external circuit. Furthermore, the faster welding speed and concentrated heat input help reduce the deformation of the transition connection bus 120 and the connection terminal 10, eliminating the need for subsequent shaping and simplifying the installation steps of the shunt 100.

[0058] In some embodiments, reference Figure 2 and Figure 3 The shunt 100 may include two transition connection bars 120. One transition connection bar 120 is provided with a riveting hole 122 so as to be riveted and welded to the connection terminal 10 of the external circuit through a riveting piece. The other transition connection bar 120 is provided with a connection hole 121 so that the connection terminal 10 of the external circuit can pass through, so that the transition connection bar 120 and the connection terminal 10 of the external circuit can form a hole-shaft fit and be welded.

[0059] Thus, the shunt 100 of this embodiment can be connected to connection terminals 10 of different structures in external circuits, which provides greater connection flexibility and expands the scope of application.

[0060] See also some of the possible implementation methods. Figure 3 , Figure 4 and Figure 5 As shown, in this embodiment of the application, the welding trajectory 123 between the transition connection bar 120 and the external circuit is circular or elliptical.

[0061] It should be noted that the length of the welding trajectory 123 is the continuous conductive length of the weld between the transition connection bus 120 and the connection terminal 10 along the current direction. Therefore, the length of the welding trajectory 123 directly determines the effective conductive cross-sectional area and resistance. The current carrying capacity of the transition connection bus 120 is approximately linearly positively correlated with the length of the welding trajectory 123.

[0062] Furthermore, given a fixed length for the welding trajectory 123, the welding trajectory 123 is set to a circle, such as... Figure 4 As shown, this welding trajectory 123 does not involve abrupt stops or reversals, which helps improve stability and overall strength. Furthermore, when the installation space for the shunt 100 is limited, the welding trajectory 123 can be set to an ellipse, such as... Figure 5 As shown, this reduces the space occupied by the welding trajectory 123 along the minor axis of the ellipse while keeping the length of the welding trajectory 123 unchanged, which helps to reduce the size of the transition connection row 120 and improve space utilization.

[0063] Of course, the specific shape of the welding trajectory 123 is not limited in this embodiment of the application. The transition connection 120 can be reasonably set according to the requirements of the current carrying capacity and the size of the installation space.

[0064] See also some of the possible implementation methods. Figures 1 to 3 As shown, in this embodiment of the application, the connecting portion 112 and the transition connecting row 120 are stacked and welded together.

[0065] Understandably, when assembling the shunt 100, the connecting part 112 and the transition connecting bar 120 can be overlapped to partially stack the connecting part 112 and the transition connecting bar 120, and then the two can be welded together. This can increase the contact area between the connecting part 112 and the transition connecting bar 120, thereby reducing the contact resistance between the connecting part 112 and the transition connecting bar 120, which helps to slow down the oxidation rate of the transition connecting bar 120, reduce local heat generation, and thus extend the service life of the shunt 100 and ensure the continuous and stable operation of the shunt 100.

[0066] See also some of the possible implementation methods. Figures 1 to 3 As shown, in this embodiment of the application, both the alloy substrate 111 and the connecting portion 112 have a first surface along the thickness direction, and there is a height difference between the first surface of the alloy substrate 111 and the first surface of the connecting portion 112; the transition connecting row 120 has a connecting mating portion 124, which is stacked and connected to the connecting portion 112, and the first surface of the connecting mating portion 124 is flush with the first surface of the alloy substrate 111.

[0067] In practical implementation, a height difference is set between the alloy substrate 111 and the connecting part 112 to provide a certain installation space for the transition connection row 120. After the connecting mating part 124 is welded together with the connecting part 112, the connecting mating part 124 is flush with the alloy substrate 111, which can make the overall outer surface of the shunt 100 smooth, reduce the inductive effect generated by the current at corners or step surfaces, thereby improving the current measurement accuracy of the shunt 100, reducing measurement errors, and improving the accuracy and response speed of current sampling.

[0068] In addition, the fact that the first surface of the connecting mating part 124 is flush with the first surface of the alloy substrate 111 helps to reduce assembly errors when assembling the splitter 100, and allows the connecting mating part 124 and the alloy substrate 111 to be quickly aligned, which helps to improve the assembly efficiency of the splitter 100.

[0069] See also some of the possible implementation methods. Figures 1 to 3 As shown, the alloy substrate 111 of this application embodiment also has a second surface opposite to the first surface along the thickness direction, and the sampling circuit board 130 is disposed on the second surface.

[0070] In some embodiments, the sampling circuit board 130 and the transition connection bar 120 are respectively disposed on both sides of the alloy substrate 111, which is beneficial for achieving electrical and thermal isolation while ensuring signal integrity and mechanical stability. Specifically, this layout allows the sensitive electronic components on the sampling circuit board 130 to be kept away from the heat and electromagnetic interference that will inevitably be generated when a large current passes through the transition connection bar 120 and the alloy substrate 111, which is beneficial for improving the accuracy and stability of the sampling signal.

[0071] At the same time, it can also facilitate the assembly and maintenance of the shunt 100. Each component does not interfere with each other and is independent, making the operation more convenient and reducing the impact on other components when debugging the sampling circuit board 130 or replacing the transition connection bar 120.

[0072] This application also provides a power distribution device, including the above-described shunt.

[0073] The structure and working principle of the splitter 100 have been described in detail in the above embodiments, and will not be repeated here.

[0074] In this embodiment of the application, the use of the above-described shunt 100 helps to extend the service life of the power distribution device.

[0075] See Figure 1 As shown in the figure, this application embodiment also provides an energy storage device, including: an energy storage module and the above-mentioned power distribution device, wherein the power distribution device is electrically connected to the energy storage module and an external power consumption device respectively.

[0076] The structure and working principle of the splitter 100 have been described in detail in the above embodiments, and will not be repeated here.

[0077] In this embodiment of the application, the use of the above-mentioned shunt 100 helps to extend the service life of the energy storage device. At the same time, the shunt 100 is electrically connected to the energy storage module and the power control unit, thereby real-time monitoring of operating conditions such as current in the energy storage module and transmitting the monitoring signal to the power distribution device, ensuring that the energy storage device can operate continuously, safely and stably, which helps to improve the reliability of the energy storage device.

[0078] The energy storage device can be a battery pack, a storage battery, etc., the energy storage module can be a battery pack, and the electronic control unit can be a battery management system. This application does not limit these aspects.

[0079] See Figure 1 As shown in the figure, this application embodiment also provides an electrical device, including an electrical device and the above-mentioned energy storage device.

[0080] In this embodiment of the application, by using the above-mentioned energy storage device, it is beneficial to ensure the efficient operation of electrical equipment, and the problems of the energy storage device can be detected in a timely manner through the monitoring of the shunt 100, so as to carry out inspection and maintenance of the energy storage device, which helps to reduce the maintenance cost of electrical equipment and ensure the safe operation of electrical equipment.

[0081] The electrical equipment can be various devices such as vehicles, communication equipment, energy storage systems, and aircraft, and this application does not limit this.

[0082] In summary, the shunt 100 provided in this application embodiment includes a main busbar 110, a transition connection busbar 120, and a sampling circuit board 130. The main busbar 110 includes an alloy substrate 111 and a connecting portion 112. The alloy substrate 111 is a copper-manganese alloy, the connecting portion 112 is a copper metal component, and the transition connection busbar 120 is an aluminum metal component. The connecting portion 112 and the transition connection busbar 120 are fixed together by EMPT welding, ultrasonic welding, or brazing, sealing the weld seam within the joint area between the two to prevent external electrolyte from entering between the transition connection busbar 120 and the connecting portion 112. This facilitates physical isolation of the galvanic cell circuit, reduces the oxidation rate of the transition connection bar 120, and thus slows down corrosion. The connection terminal 10 of the external circuit is made of aluminum, which is consistent with the material of the transition connection bar 120, thereby preventing galvanic cell reactions. Therefore, the shunt 100 in this embodiment can slow down corrosion at the connection between the shunt 100 and the external circuit, maintain a low contact resistance, and thus help extend the service life of the shunt 100, ensure the continuous and stable operation of the shunt 100, and improve the reliability of energy storage devices and electrical equipment.

[0083] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0084] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0085] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0086] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A shunt, characterized in that, include: The main row includes an alloy matrix and a connecting portion connected to the alloy matrix, wherein the connecting portion has some of the same components as the alloy matrix; A transition connection bar is welded to the connecting part. The transition connection bar is made of a different material than the connecting part. The transition connection bar is used to connect to an external circuit. At least some components of the transition connection bar are the same as those of the connection terminals of the external circuit.

2. The shunt according to claim 1, characterized in that, The transition connection bar is provided with connection holes. The connection hole is used for the connection terminals of the external circuit to pass through, so that the transition connection row can be shaft-fitted with the connection terminal hole of the external circuit and welded.

3. The shunt according to claim 1, characterized in that, The transition connection bar is provided with riveting holes. The rivet hole is used to rivet and weld the connection terminal of the external circuit with a rivet post.

4. The shunt according to claim 2 or 3, characterized in that, The transition connection bar is suitable for connection to the external circuit terminals using laser deep penetration welding or laser penetration welding.

5. The shunt according to claim 4, characterized in that, The welding trajectory between the transition connection bar and the external circuit is circular or elliptical.

6. The shunt according to any one of claims 1-5, characterized in that, There are at least two connecting parts, and the number of transition connecting rows corresponds to the number of connecting parts.

7. The shunt according to claim 6, characterized in that, There are two transition connection bars. One of the two transition connection bars is provided with a connection hole to mate with and weld to the connection terminal hole of the external circuit. The other is provided with a riveting hole for riveting and welding to the connection terminal of the external circuit through a rivet.

8. The shunt according to claim 6, characterized in that, The connecting part and the transition connecting row are stacked and welded.

9. The shunt according to claim 8, characterized in that, Both the alloy matrix and the connecting portion have a first surface along the thickness direction. There is a height difference between the first surface of the alloy matrix and the first surface of the connecting portion; The transition connection row has a connecting mating part, which is stacked and connected to the connecting part.

10. The shunt according to claim 9, characterized in that, The first surface of the connecting mating part is flush with the first surface of the alloy substrate.

11. The shunt according to claim 8, characterized in that, The connecting part and the transition connecting block are welded using one of the following methods: electromagnetic pulse welding, ultrasonic welding, or brazing.

12. The shunt according to claim 9, characterized in that, The alloy matrix also has a second surface that is opposite to the first surface along the thickness direction. The splitter further includes a sampling circuit board, which is disposed on the second surface and connected to the connecting portion.

13. The shunt according to any one of claims 1-5, characterized in that, The alloy matrix is ​​a copper-manganese alloy; the connecting part is made of copper metal; and the transition connecting strip is made of aluminum metal.

14. A power distribution device, characterized in that, include: The shunt as described in any one of claims 1-13.

15. An energy storage device, characterized in that, include: Energy storage modules; The power distribution device of claim 14, wherein the power distribution device is used for electrical connection with the energy storage module and external power consumption devices.

16. An electrical appliance, characterized in that, include: The electrical device and the energy storage device according to claim 15, wherein the electrical device is electrically connected to the energy storage device.

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