Electric connector and battery module

Abstract

The utility model discloses an electric connecting piece and a battery module, the electric connecting piece is used for electrically connecting two adjacent batteries, and the electric connecting piece comprises a first connecting part, a second connecting part and a transition part connected between the first connecting part and the second connecting part; the parts of the first connecting part and the second connecting part, which are used for being welded with a battery pole, are welding parts, stress holes are formed between the welding parts of the first connecting part and the second connecting part, and the stress holes are formed in the first connecting part and / or the second connecting part; and the first connecting part and / or the second connecting part penetrate through the thickness direction of the first connecting part and / or the second connecting part. According to the battery module, the stress hole is formed between the two welding parts, stress generated by high welding temperature can be released, and meanwhile, when the battery module is in a vibration environment, the stress hole can filter vibration waves, so that the influence of the vibration waves on the welding position can be reduced, and then the risk of unsoldering of the electric connecting piece can be reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to an electrical connector and a battery module. Background Technology

[0002] In related technologies, battery systems are classified from high to low system hierarchy. One classification method is battery pack, battery module, and battery. This means that most lithium battery manufacturers produce battery modules with the battery as the smallest unit. In existing technologies, batteries are first produced, then two or more batteries are assembled into a battery module by connecting them in series and parallel using electrical connectors. Finally, two or more battery modules are connected in series and parallel using electrical connectors to form a battery pack.

[0003] For battery systems, the most basic functional requirement is the ability to input and output electrical energy, making the safety and reliability of electrical connectors particularly important. Currently, electrical connectors are connected to the battery terminals by welding. After welding, the sheet-like electrical connectors are in a taut state. During subsequent use of the battery module, heat deformation or vibration can cause displacement, which can lead to the electrical connectors pulling on the weld joints and causing them to detach.

[0004] Therefore, how to reduce the risk of electrical connectors becoming detached due to vibration, thermal deformation, and other factors is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this application is to provide an electrical connector to reduce the risk of the electrical connector becoming detached due to vibration, thermal deformation, etc.

[0006] Another objective of this application is to provide a battery module having the aforementioned electrical connectors.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] The first aspect of this application provides an electrical connector for electrically connecting two adjacent batteries, including a first connecting portion and a second connecting portion and a transition portion connected between the first connecting portion and the second connecting portion;

[0009] The first and second connecting portions are welded to the battery terminals. A stress hole is provided between the welded portions of the first and second connecting portions, extending through their thickness direction. The electrical connector provided in this application has a stress hole between the welded portions of the first and second connecting portions. When the welded portions on the first and second connecting portions are welded to the battery terminals, stress can be generated at the weld joint. However, due to the presence of the stress hole, the stress generated by the high temperature of welding can be released as the welding position cools, preventing desoldering due to stress. Furthermore, placing the stress hole between the two welded portions allows it to filter vibration waves when the battery module is in a vibrating environment, thereby reducing the impact of vibration waves on the welding position and reducing the risk of desoldering of the electrical connector.

[0010] A second aspect of this application provides a battery module including an electrical connector as described in any of the preceding claims and at least two batteries, each battery including a terminal assembly, the terminal assembly being the current output terminal of the battery, and a first connection portion and a second connection portion being respectively welded to the surface of the terminal assemblies of two adjacent batteries.

[0011] The battery module provided in this application has all the technical effects of the aforementioned electrical connectors, which will not be elaborated further here. Attached Figure Description

[0012] 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a partial structural diagram of the battery module disclosed in an embodiment of this application;

[0014] Figure 2 This is a partial structural diagram of the battery module disclosed in an embodiment of this application;

[0015] Figure 3 This is a schematic diagram of the electrical connector disclosed in an embodiment of this application at one angle.

[0016] Figure 4 This is a schematic diagram of the electrical connector disclosed in an embodiment of this application from another angle.

[0017] Figure 5This is a top view of the electrical connector disclosed in the embodiments of this application;

[0018] Figure 6 This is a side view of the electrical connector disclosed in an embodiment of this application.

[0019] The meanings of the various reference numerals in the figure are as follows:

[0020] 100 - Electrical connector; 110 - First connection part; 111 - Stress hole; 112 - Welded part; 120 - Second connection part; 130 - Transition part; 140 - Stress relief notch;

[0021] 200-Crossbeam;

[0022] 300 is a battery. Detailed Implementation

[0023] The core of this application is to provide an electrical connector to reduce the risk of the electrical connector becoming detached due to vibration, thermal deformation, and other factors.

[0024] Another key aspect of this application is to provide a battery module having the aforementioned electrical connectors.

[0025] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the application as described in the claims. Additionally, the complete composition represented in the embodiments below is not limited to what is necessary as the solution to the application described in the claims. It should be noted that, for ease of description, only the parts relevant to the application are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0026] like Figures 1-3 As shown in the embodiments of this application, the electrical connector 100 is used to realize the electrical connection between batteries 300 in a battery module. For example, the electrical connector 100 can be used to connect the positive terminal of one battery 300 and the negative terminal of another battery 300 to realize the series connection of the batteries 300; of course, the electrical connector 100 can also be used to connect the terminals of the same pole of two batteries 300 to realize the parallel connection of the batteries 300.

[0027] The electrical connector 100 includes a first connecting portion 110, a second connecting portion 120, and a transition portion 130 connecting the first connecting portion 110 and the second connecting portion 120. The first connecting portion 110 and the second connecting portion 120 are the portions used for electrical connection with the terminals of the two batteries 300.

[0028] It should be noted that a spacer may be present between the two batteries 300 connected by the electrical connector 100. The presence of the spacer allows for a greater distance between these two batteries 300 compared to other batteries 300 without a spacer. To enable the electrical connector 100 to electrically connect to both batteries 300, a transition portion 130 is provided between the first connecting portion 110 and the second connecting portion 120. This transition portion 130 allows for electrical conduction between the first connecting portion 110 and the second connecting portion 120, while also accommodating the distance between the terminals of the two batteries 300.

[0029] The spacer can be a crossbeam 200 inside the battery box. To ensure the stability of the battery after installation, the battery box is usually divided into multiple mounting cavities by the crossbeam 200. When the batteries 300 on both sides of the crossbeam 200 need to be electrically connected by the electrical connector 100, one of the first connecting part 110 and the second connecting part 120 is located on one side of the crossbeam 200, and the other is located on the other side of the crossbeam 200. The transition part 130 realizes the electrical connection between the first connecting part 110 and the second connecting part 120, and is located above the crossbeam 200.

[0030] Because the crossbeam 200 has a large width, the distance between the batteries 300 on both sides is relatively large, making the electrical connector 100 with superior vibration isolation performance disclosed in this embodiment more suitable. It should be noted that the electrical connector 100 disclosed in this embodiment is also suitable for any other adjacent batteries as long as there is a risk of vibration-induced desoldering, and is not limited to the specific application scenario of two batteries 300 separated by a spacer.

[0031] The first connecting part 110 and the second connecting part 120 are used for welding with the battery terminal, which is called the welding part 112. Usually, a positioning groove or positioning hole for positioning the battery terminal is provided at the welding part 112 to facilitate positioning with the battery terminal and improve welding accuracy and welding efficiency.

[0032] Both the first connecting portion 110 and the second connecting portion 120 have stress holes 111, and the stress holes 111 are disposed on the first connecting portion 110 and / or the second connecting portion 120. That is, stress holes 111 can be disposed only on the first connecting portion 110, or only on the second connecting portion 120, or stress holes 111 can be disposed on both the first connecting portion 110 and the second connecting portion 120. Regardless of whether the stress holes 111 are disposed on the first connecting portion 110 or the second connecting portion 120, the stress holes 111 should be located between the weld portion 112 of the first connecting portion 110 and the second connecting portion 120.

[0033] When stress holes 111 are provided on both the first connecting portion 110 and the second connecting portion 120, the stress holes 111 are located between the welded portion 112 and the transition portion 130. That is, the stress holes 111 on the first connecting portion 110 are located between the transition portion 130 and the welded portion 112 of the first connecting portion 110; the stress holes 111 on the second connecting portion 120 are located between the transition portion 130 and the welded portion 112 of the second connecting portion 120. This allows the stress holes 111 to absorb and filter vibration waves transmitted from the direction of the transition portion 130 or the direction of the other connecting portion, preventing strong vibration waves from acting on the welded portion 112 and causing detachment. It should be noted that as long as stress holes 111 are provided between the two welded portions 112, the stress after welding of the welded portion 112 can be released, and vibration waves transmitted to the welded portion 112 from other parts can also be filtered.

[0034] The stress hole 111 extends through the thickness direction of the first connecting part 110 and / or the second connecting part 120, so as to better release stress and better filter vibration.

[0035] Furthermore, the orthographic projection of the stress hole 111 on the surface of the electrical connector can be arc-shaped, for example, it can be an arc protruding towards the transition portion 130. Setting the protruding direction of the arc-shaped hole in this way can better protect the weld portion 112, improve the overall stress release of the electrical connector, and avoid deformation between two adjacent weld portions 112 due to stress, which could lead to electrical connection failure between the batteries 300.

[0036] The first connecting part 110, the transition part 130, and the second connecting part 120 can be designed as an integral structure. The integral structure has better strength, and the transition between different parts is less prone to stress concentration caused by the connection, and is therefore less likely to break due to vibration.

[0037] In summary, the electrical connector disclosed in this application has a stress hole 111 between the welding portion 112 of the first connecting portion 110 and the second connecting portion 120. When the welding portion 112 on the first connecting portion 110 and the second connecting portion 120 is welded to the battery terminal, although stress can be generated at the welding point due to the high welding temperature and the different cooling rates at different locations, the presence of the stress hole 111 allows the stress generated by the high welding temperature to be released by the deformation of the material near the stress hole 111 as the welding point cools down. This avoids desoldering due to the presence of stress.

[0038] In addition, by placing the stress hole 111 between the two welded parts 112, the stress hole 111 can filter the vibration wave when the battery module is in a vibrating environment, thereby reducing the impact of the vibration wave on the welded position and thus reducing the risk of electrical connector desoldering.

[0039] When the battery 300 vibrates, the deformation of the material near the stress hole 111 can be used to make the welded part 112 move with the battery 300 as the battery 300 vibrates, and will not desolder due to the vibration of the battery 300.

[0040] In one specific embodiment of this application, the central angle of the stress hole 111 can be designed to be 60° to 120°. Those skilled in the art will understand that a larger central angle (e.g., 120°) will affect the strength of the electrical connector 100; conversely, a smaller central angle (e.g., 60°) will affect the filtering range of vibration waves, preventing vibration waves from passing through the stress hole 111 and thus affecting the vibration isolation effect. Considering both aspects, those skilled in the art can choose a value between 60° and 120° (inclusive), such as 90°, to balance the vibration isolation range and the strength of the electrical connector 100. The specific value can be selected based on the application scenario, taking into account the weight of both the vibration isolation range and the strength of the electrical connector 100.

[0041] To ensure that the distances from each location of the stress hole 111 to the weld portion 112 are equal, in this embodiment, the stress hole 111 is designed to be concentrically arranged with at least one of the weld portions 112. When the stress hole 111 is provided only on one of the first connecting portion 110 and the second connecting portion 120, the stress hole 111 can be concentrically arranged with the weld portion 112 on the corresponding connecting portion. When the stress hole 111 is provided on both the first connecting portion 110 and the second connecting portion 120, the stress hole 111 is concentrically arranged with the weld portion 112 on the corresponding connecting portion. It should be noted that the stress hole 111 provided on the first connecting portion 110 and the second connecting portion 120 is not limited to one, and multiple stress holes can be provided as needed.

[0042] This design allows for better and faster protection of the welded portion 112, enabling stress release and resulting in a more effective and timely stress relief. Furthermore, it ensures that each location of the stress holes 111 provides the same vibration isolation effect on the welded portion 112, guaranteeing uniform vibration isolation.

[0043] For ease of understanding, the line connecting the welded portion 112 on the first connecting portion 110 and the welded portion 112 on the second connecting portion 120 is defined as the welded portion line. In a specific embodiment of this application, the stress holes 111 on the first connecting portion 110 and the stress holes 111 on the second connecting portion 120 are both symmetrical along the welded portion line. In other words, the stress holes 111 are symmetrical along the vertical line from the welded portion 112 to the transition portion 130, making the vertical distance between each position of the stress holes 111 and the transition portion 130 relatively close, ensuring that the vibration filtering effect at different positions of the stress holes 111 is similar. Moreover, with this arrangement, a larger area can be covered between the welded portion 112 and the transition portion 130 without changing the central angle of the stress holes 111.

[0044] like Figure 5 As shown in a specific embodiment of this application, the minimum distance between the welded portion 112 and the transition portion 130 is h, and the radius of the stress hole 111 is r. Therefore, the range of r / h is 0.5-0.9. The smaller the value of r / h, the more difficult it is for the stress hole 111 to release stress in a timely manner, which can easily lead to the failure of the welded portion 112 connection. Conversely, the larger the value of r / h, the larger the size of the stress hole 111, which will affect the overall current-carrying capacity of the electrical connector, causing severe localized heat generation and posing a safety risk to the battery's internal structure.

[0045] For ease of understanding, in this embodiment, the arrangement direction of the first connecting portion 110, the transition portion 130, and the second connecting portion 120 is defined as the first direction, and the direction perpendicular to the first direction within the plane containing the first connecting portion 110 and the second connecting portion 120 is defined as the second direction, such as... Figure 5 As shown.

[0046] The welding part 112 is not located in the middle of the first connecting part 110 and the second connecting part 120; in the second direction, the welding part 112 is biased to one side. Experiments have verified that when the crossbeam 200 and other spacers vibrate, the vibration waves are transmitted to the transition part 130, and then act on the location of the welding part 112, affecting the weld joint. The vibration waves with greater destructive force on the weld joint mainly originate from the position of the transition part 130 near the welding part 112, while positions farther from the welding part 112 are less prone to weld detachment due to the attenuation of the vibration waves during transmission.

[0047] Based on this, in this embodiment, along the second direction, the transition portion 130 has a stress relief notch 140 on the side near the stress hole 111, and the stress relief notch 140 is formed by the first connecting portion 110, the transition portion 130 and the second connecting portion 120.

[0048] For ease of understanding, the two sides of the transition portion 130 along the second direction are defined as the first side and the second side, respectively. The first side is the side away from the stress hole 111, while the second side is the side closer to the stress hole 111. The stress avoidance notch 140 can be understood as follows: the first side of the transition portion 130 can be designed to be flush with the end faces of the corresponding sides of the first connecting portion 110 and the second connecting portion 120, or even protrude from the end faces of the corresponding sides of the first connecting portion 110 and the second connecting portion 120; of course, it can also be recessed within the end faces of the corresponding sides of the first connecting portion 110 and the second connecting portion 120. The second side of the transition portion 130 must be recessed within the end faces of the corresponding sides of the first connecting portion 110 and the second connecting portion 120. That is, without severely damaging the strength of the electrical connector, the area of ​​the transition portion 130 close to the solder joint is removed, so that the vibration of the battery box will not be transmitted to the solder joint location along a shorter propagation path.

[0049] It should be noted that, considering the strength of the transition section 130, there may be situations where the positions corresponding to the stress holes 111 cannot be completely removed. In such cases, vibration waves will inevitably propagate to the solder joint position along a shorter propagation path. Therefore, the vibration isolation function of the stress holes 111 can be used to dissipate the vibration energy, reduce the energy of the vibration waves transmitted to the solder joint position, and thus reduce the destructive effect of the vibration waves on the solder joint position.

[0050] like Figure 5 and Figure 6 As shown, in a specific embodiment of this application, the transition portion 130 may have a wave structure. For example, the transition portion 130 may be a wave structure formed by alternating connections of several convex and concave arc portions. The convex and concave arc portions protrude in different directions, and their directions of protrusion are opposite. If a specific direction is taken as a reference, then one is a convex arc portion and the other is a concave arc portion, which can be understood as one being a wave crest and the other being a wave trough, and the wave crest and wave trough are related to the coordinate system. It should be noted that the aforementioned "several" may be greater than or equal to 2. That is, the number of convex and concave arc portions may both be two or more. Those skilled in the art can design the specific number of convex and concave arc portions according to application requirements.

[0051] In this embodiment, the entire transition section 130 can be designed as a wave structure, or only a portion or several portions can be designed as a wave structure. The wave structure design increases the elasticity and flexibility of the transition section 130. The undulations and bends of the wave structure allow the transition section 130 to absorb and disperse vibrational energy through its own deformation when subjected to vibration, thereby reducing the vibration transmission efficiency. This is similar to the working principle of vibration isolation elements such as springs or rubber, which store and release energy through deformation to achieve a vibration reduction effect.

[0052] Secondly, wave structures can also alter the propagation path of vibrations. Due to the undulations of the convex and concave sections, vibrations encounter more resistance and reflections during propagation, causing the vibrational energy to gradually attenuate. This change in propagation path helps to further reduce the impact of vibrations on surrounding structures.

[0053] Furthermore, wave structures can also increase damping. Damping is a physical quantity that describes the rate at which the vibration energy of a system decays. Increasing damping allows vibrations to decay more quickly, thereby reducing the amplitude and duration of the vibrations. Through its unique shape and material, the wave structure can increase the damping of the electrical connector 100 to a certain extent, further improving the vibration isolation effect.

[0054] In this embodiment, the wave structure includes at least one convex arc portion and concave arc portions located on both sides of the convex arc portion, i.e., it consists of two concave arc portions and one convex arc portion. After the electrical connector is installed, the convex arc portion protrudes away from the battery, and the concave arc portion protrudes towards the battery; in other words, the outer surface of the convex arc portion (i.e., the surface away from the battery) is a convex arc surface, while the outer surface of the concave arc portion (i.e., the surface away from the battery) is a concave arc surface. It should be noted that the specific number of convex and concave arc portions can be designed by those skilled in the art according to requirements and is not limited to the above example.

[0055] In one specific embodiment of this application, the thicknesses of the first connecting portion 110 and the second connecting portion 120 can be designed to be equal. Furthermore, since the heights of the terminals of each battery are the same, the first connecting portion 110 and the second connecting portion 120 should be on the same plane to facilitate connection with the terminals of the two batteries. Those skilled in the art will understand that the thicknesses of the first connecting portion 110 and the second connecting portion 120 can also be designed differently depending on the requirements, and should be determined based on the application scenario of the battery module.

[0056] The thickness of the transition portion 130 can be designed to be greater than the thickness of either the first connecting portion 110 or the second connecting portion 120. The first connecting portion 110 and the second connecting portion 120 are fixed to the battery by welding. The battery provides fixed support for the first connecting portion 110 and the second connecting portion 120. Therefore, the first connecting portion 110 and the second connecting portion 120 do not have high requirements for strength and resistance to deformation; they only need to achieve electrical connection.

[0057] Although the transition portion 130 is located above the partition (such as the crossbeam 200), it does not serve to fix it to the crossbeam 200. For example, it can be suspended above the crossbeam 200, or its arc-shaped surface protruding towards the crossbeam 200 can be used to abut against the crossbeam 200. However, in either case, it does not need to be fixed to the crossbeam. The transition portion 130 needs to have a certain resistance to deformation, so the thickness of the transition portion 130 is designed to be greater than the thickness of the first connecting portion 110 and the second connecting portion 120. In addition, a thicker transition portion 130 also has better flow capacity.

[0058] In one specific embodiment of this application, the stress holes 111 on the first connecting portion 110 and the stress holes 111 on the second connecting portion 120 can be designed to have the same shape and are symmetrically arranged along the transition portion 130. It should be noted that the symmetrical arrangement of the two stress holes 111 of the electrical connector 100 along the transition portion 130 is influenced by the position of the welding portion 112. That is, when the welding portion 112 on the first connecting portion 110 and the welding portion 112 on the second connecting portion 120 are symmetrically arranged along the transition portion 130, the stress holes 111 on the first connecting portion 110 and the stress holes 111 on the second connecting portion 120 can also be symmetrically arranged along the transition portion 130. The final arrangement of the two welding portions 112 and the two stress holes 111 of the electrical connector 100 should be determined based on the positional relationship of the batteries in the battery module.

[0059] like Figure 1 As shown in the illustration, this application also discloses a battery module, including the electrical connector 100 disclosed in the above embodiment and at least two batteries 300. Each battery 300 includes a terminal assembly (e.g., a positive terminal and a negative terminal), which serves as the current output terminal of the battery 300. The first connecting portion 110 and the second connecting portion 120 of the electrical connector 100 are respectively welded to the surfaces of the terminal assemblies of two adjacent batteries 300. The battery module disclosed in this application, having the aforementioned electrical connector 100, possesses all the technical effects of the aforementioned electrical connector 100, which will not be elaborated upon further here.

[0060] The battery module also includes a battery housing, within which a crossbeam 200 is provided. The crossbeam 200 divides the battery housing into multiple mounting areas, each of which contains several batteries. The batteries on both sides of the crossbeam 200 are electrically connected via the electrical connector 100 disclosed in the above embodiment, and a transition portion 130 spans across the crossbeam 200. Since the electrical connector 100 disclosed in the above embodiment has superior vibration isolation capabilities, and the two batteries 300 separated by the crossbeam 200 have a greater distance, they are more susceptible to desoldering due to vibration. Connecting the batteries 300 on both sides of the crossbeam 200 via the electrical connector 100 disclosed in the above embodiment reduces the risk of desoldering due to vibration.

[0061] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0062] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0063] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0064] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An electrical connector, characterized in that, For electrically connecting two adjacent batteries, it includes a first connecting part (110) and a second connecting part (120) and a transition part (130) connecting the first connecting part (110) and the second connecting part (120); The portion of the first connecting part (110) and the second connecting part (120) used for welding with the battery terminal is a welding part (112). A stress hole (111) is provided between the welding parts of the first connecting part (110) and the second connecting part (120). The stress hole (111) is provided on the first connecting part (110) and / or the second connecting part (120) and penetrates through the thickness direction of the first connecting part (110) and / or the second connecting part (120).

2. The electrical connector as claimed in claim 1, characterized in that, The stress hole (111) has an arc-shaped orthographic projection on the surface of the electrical connector.

3. The electrical connector as described in claim 2, characterized in that, The orthographic projection of the stress hole (111) on the surface of the electrical connector is an arc shape that protrudes toward the transition portion (130).

4. The electrical connector as described in claim 3, characterized in that, The first connecting part (110) and the second connecting part (120) are both provided with stress holes (111).

5. The electrical connector as claimed in claim 1, characterized in that, The central angle of the stress hole (111) is 60° to 120°; And / or, The stress hole (111) is arranged concentrically with at least one of the welded parts (112).

6. The electrical connector as claimed in claim 1, characterized in that, The line connecting the welding part (112) on the first connecting part (110) and the welding part (112) on the second connecting part (120) is the welding part connection line; The first connecting part (110) and the second connecting part (120) are both provided with stress holes (111), and the stress holes (111) on the first connecting part (110) and the stress holes (111) on the second connecting part (120) are symmetrical along the line connecting the welding parts.

7. The electrical connector as claimed in claim 1, characterized in that, The minimum distance from the welded part (112) to the transition part (130) is h, and the radius of the stress hole (111) is r, then the range of r / h is 0.5-0.

9.

8. The electrical connector as claimed in claim 1, characterized in that, The first connecting part (110), the transition part (130) and the second connecting part (120) are arranged in a first direction. In the plane where the first connecting part (110) and the second connecting part (120) are located, the direction perpendicular to the first direction is the second direction. Along the second direction, the transition portion (130) has a stress relief notch (140) on the side near the stress hole (111), the stress relief notch (140) being surrounded by the first connecting portion (110), the transition portion (130) and the second connecting portion (120).

9. The electrical connector as described in any one of claims 1-8, characterized in that, The transition section (130) has a wave-like structure.

10. The electrical connector as claimed in claim 9, characterized in that, The transition section (130) is a wave structure formed by alternating connections of several convex and concave arc sections.

11. The electrical connector as claimed in any one of claims 1-8, characterized in that, The first connecting portion (110) and the second connecting portion (120) have the same thickness; And / or, The thickness of the transition portion (130) is greater than the thickness of either the first connecting portion (110) or the second connecting portion (120); And / or, The first connecting part (110), the transition part (130) and the second connecting part (120) are an integral structure.

12. The electrical connector as described in any one of claims 1-8, characterized in that, The first connecting portion (110) and the second connecting portion (120) are both provided with stress holes (111), and the stress holes (111) on the first connecting portion (110) and the stress holes (111) on the second connecting portion (120) have the same shape and are arranged symmetrically along the transition portion (130).

13. A battery module, characterized in that, Includes an electrical connector as described in any one of claims 1-12 and at least two batteries (300), each battery (300) including a terminal assembly, the terminal assembly being the current output terminal of the battery (300), the first connection portion (110) and the second connection portion (120) being respectively welded to the surface of the terminal assembly of two adjacent batteries (300).

14. The battery module as described in claim 13, characterized in that, Each of the batteries is disposed in a battery box, and a crossbeam (200) is provided in the battery box. The crossbeam (200) divides the battery box into multiple installation areas, and each installation area is provided with a number of batteries (300). The transition portion (130) of the electrical connector (100) for connecting the batteries on both sides of the crossbeam (200) spans across the crossbeam (200).

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