Relay, battery assembly and electric device

Abstract

The utility model relates to the field of batteries, and discloses a relay, a battery assembly and an electric device. The relay comprises a housing which is provided with a polygonal hole which is communicated with the interior of the housing; the fixed contact penetrates through the polygonal hole, one end of the fixed contact is arranged in the shell, the other end of the fixed contact is arranged outside the shell, the fixed contact comprises a prism structure, at least part of the prism structure is arranged in the polygonal hole, and the hole wall of the polygonal hole is located in the circumferential direction of the prism structure to limit the prism structure; and the movable contact is arranged in the shell in a reciprocating motion manner and is used for being connected with or separated from the static contact. The static contact comprises a prism structure which can be matched with the polygonal hole in a limiting manner, so that the shell can form circumferential limiting on the static contact through the polygonal hole, the static contact is prevented from rotating, the stability of the static contact is improved, the problem of loose connection between the static contact and the busbar caused by rotation of the static contact is solved, and the reliability of the busbar is improved. Therefore, the stability of the connection between the static contact and the busbar is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to relays, battery assemblies, and electrical devices. Background Technology

[0002] Relays, as key switching components, are widely used in the high-voltage circuits of battery packs to control the transmission of high-voltage electricity. With the rapid development of electric vehicles, the requirements for the safety, reliability, and performance of battery packs are increasing, making the role of relays, as an important component, particularly prominent.

[0003] A relay typically includes a housing, a stationary contact, and a moving contact. One end of the stationary contact is located inside the housing, while the other end extends outside the housing and is used to connect to a busbar. The moving contact is located inside the housing and is used to engage or disengage from the stationary contact.

[0004] However, due to vibration and other reasons, the stationary contact is prone to rotation, which can cause the connection between the stationary contact and the busbar to loosen, affecting the stability of current transmission. Utility Model Content

[0005] In view of this, the present invention provides a relay, a battery assembly, and an electrical device to solve or improve the problem that stationary contacts are prone to rotation.

[0006] In a first aspect, this utility model provides a relay, comprising:

[0007] An outer casing, wherein a polygonal hole is provided on the outer casing, and the polygonal hole communicates with the interior of the outer casing;

[0008] A stationary contact is provided through the polygonal hole, with one end of the stationary contact located inside the housing and the other end located outside the housing. The stationary contact includes a prism structure, at least a portion of which is located inside the polygonal hole. The wall of the polygonal hole limits the prism structure in the circumferential direction.

[0009] A moving contact is disposed within the housing and is reciprocally movable, and is used to engage or disengage with the stationary contact.

[0010] In one optional embodiment, the prism structure is disposed at the end of the stationary contact away from the moving contact, the stationary contact further includes a connecting post, the connecting post being a cylindrical structure, one end of the connecting post being connected to the end of the prism structure facing the moving contact, and the other end of the connecting post extending toward the moving contact.

[0011] In one alternative embodiment, the prism structure is configured as an aluminum prism, the connecting post is configured as a copper connecting post, and the prism structure and the connecting post are welded together.

[0012] In one optional embodiment, the outer peripheral wall of the prism structure facing the connecting post is provided with an annular groove, so that the end of the prism structure facing the connecting post forms a connecting part, the cross-sectional area of ​​the connecting part is smaller than the cross-sectional area of ​​the prism structure, and the cross-sectional area of ​​the connecting part is larger than the cross-sectional area of ​​the connecting post.

[0013] In one alternative embodiment, the stationary contact further includes a tapered structure disposed at the end of the connecting post away from the prism structure, and the cross-sectional area of ​​the tapered structure gradually decreases along the direction from the prism structure to the connecting post.

[0014] In one alternative embodiment, the end face of the stationary contact opposite to the moving contact is provided with a blind hole.

[0015] In one optional embodiment, the housing is provided with a partition, the number of polygonal holes is two, the two polygonal holes are distributed on both sides of the partition, the number of stationary contacts is two, and the stationary contacts are correspondingly inserted through the polygonal holes.

[0016] In one alternative embodiment, the housing includes a shell and a cover, the shell having an opening, the cover being removably closed to the opening, and the polygonal hole being disposed on the shell wall opposite to the opening.

[0017] Secondly, this utility model also provides a battery assembly, including a busbar and a relay as described above, wherein the busbar is connected to the portion of the stationary contact located outside the housing.

[0018] Thirdly, this utility model also provides an electrical device, including the relay as described above or the battery assembly as described above.

[0019] The relay provided by this utility model has a polygonal hole on the housing and the stationary contact includes a prism structure that can be matched with the polygonal hole for limiting. This allows the housing to circumferentially limit the stationary contact through the polygonal hole, preventing the stationary contact from rotating. This improves the stability of the stationary contact and avoids the problem of loose connection between the stationary contact and the busbar due to the rotation of the stationary contact, thereby improving the stability of the connection between the stationary contact and the busbar.

[0020] The battery assembly and electrical device provided by this utility model include the relay provided by this utility model, and therefore also include all the above-mentioned advantages of the relay. Attached Figure Description

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

[0022] Figure 1 This is a schematic diagram of the structure of the relay provided in the embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of a relay provided in an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the connection structure between the coil and the moving contact of the relay provided in this embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the stationary contact provided in the embodiment of this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Relay; 101. Housing; 1011. Polygonal hole; 1012. Separator; 1013. Housing; 1014. Cover; 102. Stationary contact; 1021. Prismatic structure; 1022. Connecting post; 1023. Connecting part; 1024. Conical structure; 1025. Blind hole; 1026. Annular groove; 103. Moving contact; 104. Coil; 105. Drive rod; 2. Busbar. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In related technologies, relays typically include a housing, a stationary contact, and a moving contact. One end of the stationary contact is located inside the housing, while the other end extends outside the housing and is used to connect to a busbar. The moving contact is reciprocatingly located inside the housing and is used to engage or disengage with the stationary contact.

[0030] However, stationary contacts are usually designed as cylindrical structures and typically lack circumferential positioning structures. Therefore, under vibration loads and other conditions, stationary contacts are prone to rotation, which can cause the connection between the stationary contact and the busbar to loosen and affect the stability of current transmission.

[0031] To address or improve the problem of stationary contacts easily rotating, this utility model provides a relay, a battery assembly, and an electrical device.

[0032] The following is combined with Figures 1 to 4 The present invention describes the relay 1 provided in the embodiments of the present invention.

[0033] Specifically, relay 1 includes a housing 101, a stationary contact 102, and a moving contact 103.

[0034] The outer shell 101 is provided with a polygonal hole 1011, which is connected to the interior of the outer shell 101, that is, the polygonal hole 1011 penetrates the shell wall of the outer shell 101.

[0035] The stationary contact 102 passes through the polygonal hole 1011, with one end of the stationary contact 102 located inside the housing 101 and the other end located outside the housing 101. The portion of the stationary contact 102 located outside the housing 101 is used to connect to the busbar 2.

[0036] Furthermore, the stationary contact 102 includes a prism structure 1021, at least a portion of which passes through a polygonal hole 1011. The wall of the polygonal hole 1011 limits the prism structure 1021 in the circumferential direction. Specifically, when the prism structure 1021 passes through the polygonal hole 1011, the inner wall of the polygonal hole 1011 limits the prism structure 1021, restricting its degree of freedom in the circumferential direction. The circumferential direction of the prism structure 1021 is the direction of rotation about its axis.

[0037] The moving contact 103 is reciprocally disposed inside the housing 101, and is used to engage or disengage with the stationary contact 102. When the moving contact 103 is engaged with the stationary contact 102, the relay 1 is in a conducting state and can be used to conduct current. When the moving contact 103 is disengaged from the stationary contact 102, the relay 1 is in an open state and can disconnect the current path.

[0038] In this embodiment, by providing a polygonal hole 1011 on the housing 101 and including a prism structure 1021 that can be limited and matched with the polygonal hole 1011, the housing 101 can form a circumferential limit on the static contact 102 through the polygonal hole 1011, preventing the static contact 102 from rotating, thereby improving the stability of the static contact 102. This also avoids the problem of loosening of the connection between the static contact 102 and the busbar 2 due to the rotation of the static contact 102, thus improving the stability of the connection between the static contact 102 and the busbar 2.

[0039] In addition, the moving contact 103 can engage or disengage from the stationary contact 102, thereby controlling the relay 1 to switch between the on and off states to realize the circuit switching.

[0040] In some embodiments provided by this utility model, the number of sides of the prism structure 1021 is the same as the number of sides of the polygonal hole 1011, and they correspond one-to-one.

[0041] In this embodiment, since each side of the prism structure 1021 and the polygonal hole 1011 is perfectly matched, the compatibility between the two components can be ensured, and precise alignment can be guaranteed during installation, reducing assembly errors.

[0042] In addition, since each face of the prism structure 1021 can be limited by the contact point on the polygonal hole 1011 and prevent the prism structure 1021 from rotating, the prism structure 1021 can be provided with the best circumferential limiting effect.

[0043] Furthermore, since the prism structure 1021 and each side of the polygonal hole are subjected to uniform force, local stress concentration can be effectively avoided, thus extending the service life of the component.

[0044] Optionally, the polygonal hole 1011 is configured as a square hole, and correspondingly, the prism structure 1021 is configured as a quadrangular prism structure 1021. In this embodiment, since the four faces are evenly stressed, this design can effectively avoid local stress concentration and extend the service life of the component. In addition, the machining of square holes and quadrangular prisms is relatively simple, usually requiring only standard milling machines, drilling machines, or CNC machine tools, which can reduce manufacturing costs and improve production efficiency.

[0045] Of course, the polygonal hole 1011 can also be set as a pentagonal hole or a hexagonal hole, and correspondingly, the prism structure 1021 can be set as a pentagonal prism or a hexagonal prism.

[0046] Of course, in embodiments not shown in this utility model, the number of sides of the prism structure 1021 and the number of sides of the polygonal hole 1011 may be different. Optionally, the number of sides of the polygonal hole 1011 is greater than the number of sides of the prism structure 1021. For example, the polygonal hole 1011 is a hexagonal hole, while the prism structure 1021 is a triangular prism or a quadrangular prism. This is not limited.

[0047] refer to Figures 1-3 As shown, in some embodiments provided by this utility model, the prism structure 1021 is disposed at one end of the stationary contact 102 away from the moving contact 103. For example, one end of the prism structure 1021 is disposed inside the polygonal hole 1011, and the other end protrudes out of the polygonal hole 1011 away from the opening of the moving contact 103.

[0048] The stationary contact 102 also includes a connecting post 1022, which is a cylindrical structure. One end of the connecting post 1022 is connected to the end of the prism structure 1021 facing the moving contact 103, and the other end of the connecting post 1022 extends toward the moving contact 103. That is, the end of the connecting post 1022 away from the prism structure 1021 is used to engage or disengage with the moving contact 103. Optionally, the connecting post 1022 and the prism structure 1021 are integrally formed, or the connecting post 1022 and the prism structure 1021 are welded together.

[0049] In this embodiment, the prism structure 1021 is engaged with the cylindrical connecting post 1022, and the prism structure 1021 can be engaged with the polygonal hole 1011 on the outer shell 101 to prevent the stationary contact 102 from rotating circumferentially.

[0050] By extending the connecting post 1022 into the interior of the housing 101, the portion of the stationary contact 102 extending into the interior of the housing 101 in this embodiment can be the same as or similar to the structure of the existing stationary contact 102. This reduces the task of adapting and improving the internal structure of the housing 101, reduces the cost and time of redesign and manufacturing, lowers the cost of improving the relay 1, and ensures the connection stability between the connecting post 1022 and the moving contact 103 or other components.

[0051] In some embodiments provided by this utility model, the prism structure 1021 is set as an aluminum prism, the connecting column 1022 is set as a copper connecting column, and the prism structure 1021 and the connecting column 1022 are welded together.

[0052] In this embodiment, by setting the prism structure 1021 as an aluminum prism and the connecting column 1022 as a copper connecting column, and welding the two together, the prism structure 1021 can be connected to the aluminum busbar 2, thereby reducing the weight and cost of the busbar 2, avoiding the problem of electrochemical corrosion between the stationary contact 102 and the busbar 2, and avoiding the problem of loose connection or connection stress caused by the different materials and inconsistent thermal expansion coefficients of the stationary contact 102 and the busbar 2.

[0053] In addition, the connecting post 1022 is made of copper with excellent conductivity, which can provide low resistance in the current transmission path and ensure efficient current transmission.

[0054] Optionally, the prism structure 1021 and the connecting column 1022 can be connected by explosive bonding process, friction welding or brazing.

[0055] In some embodiments provided by this utility model, the outer peripheral wall of the end of the prism structure 1021 facing the connecting post 1022 is provided with an annular groove 1026, so that the end of the prism structure 1021 facing the connecting post 1022 forms a connecting portion 1023. It can be understood that the connecting portion 1023 is connected to the connecting post 1022.

[0056] The cross-sectional area of ​​the connecting part 1023 is smaller than that of the prism structure 1021, and the cross-sectional area of ​​the connecting part 1023 is larger than that of the connecting column 1022. It is understood that the cross-sectional area described here refers to the area of ​​the cross-section perpendicular to the axial direction of the prism structure.

[0057] In this embodiment, the prism structure 1021 is connected to the connecting post 1022 via the connecting portion 1023. The cross-sectional area of ​​the connecting portion 1023 is smaller than that of the prism structure 1021, and the cross-sectional area of ​​the connecting portion 1023 is larger than that of the connecting post 1022. Thus, the cross-sectional area of ​​the connecting portion 1023 is between that of the prism structure 1021 and the connecting post 1022, which can form a gradual transition area. This can enhance the mechanical strength of the connection point and ensure more uniform force transmission between different cross sections, thereby reducing stress concentration and improving connection stability.

[0058] In addition, the design of the connecting part 1023 can ensure that the current is more uniform in the transmission path between the prism structure 1021 and the connecting post 1022, reduce the non-uniformity of local current density, help reduce contact resistance, improve current transmission efficiency, and reduce energy loss and heat generation.

[0059] Optionally, the prism structure 1021 and the connecting part 1023 are integrated into one structure, and both the prism structure 1021 and the connecting part 1023 are made of aluminum. The connecting post 1022 is made of copper and is combined with the connecting part 1023.

[0060] Optionally, the connecting portion 1023 is configured as a cylindrical structure, with its two ends connected to the prism structure 1021 and the connecting post 1022, respectively. In this embodiment, the design of the cylindrical connecting portion 1023 makes the cross-sectional change smoother, avoiding sharp edges or abrupt changes, thereby reducing the risk of stress concentration.

[0061] In some embodiments of this invention, the stationary contact further includes a tapered structure 1024. The tapered structure 1024 is disposed at the end of the connecting post 1022 away from the prism structure 1021, and its cross-sectional area gradually decreases along the direction from the prism structure 1021 to the connecting post 1022. That is, the end of the tapered structure 1024 away from the prism structure 1021 is used to engage with the moving contact 103.

[0062] In this embodiment, since the cross-sectional area of ​​the tapered structure 1024 gradually decreases, the tapered structure 1024 can provide a greater contact force when in contact. That is, as the moving contact 103 is inserted, the tapered structure 1024 will gradually compress the moving contact 103 and increase the contact pressure to ensure good electrical contact between the moving contact 103 and the stationary contact 102.

[0063] In some embodiments of this utility model, a blind hole 1025 is provided on the end face of the stationary contact 102 facing away from the moving contact 103. In this embodiment, by providing a blind hole 1025 on the end face of the stationary contact 102, the blind hole 1025 can be used as a positioning hole during welding, ensuring the precise alignment of the stationary contact 102 and the busbar 2 during the welding process, which helps to reduce welding errors and improve welding quality and reliability.

[0064] In some embodiments provided by this utility model, the outer shell 101 is provided with a partition 1012, the number of polygonal holes 1011 is two, the two polygonal holes 1011 are distributed on both sides of the partition 1012, the number of stationary contacts 102 is two, and the stationary contacts 102 are correspondingly inserted through the polygonal holes 1011.

[0065] In this embodiment, the two stationary contacts 102 are respectively connected to the two ends of the circuit to be controlled. When the moving contact 103 is engaged with the two stationary contacts 102, the moving contact 103 conducts the two stationary contacts 102, and the relay 1 is in the conducting state. When the moving contact 103 is disengaged from the two stationary contacts 102, the two stationary contacts 102 are disconnected, and the relay 1 is in the off state.

[0066] By providing a separator 1012 between the two stationary contacts 102, the separator 1012 can prevent short circuits caused by contact between the components such as the busbar 2 connected to the two stationary contacts 102.

[0067] In some embodiments provided by this utility model, the relay 1 further includes a coil 104 and a transmission rod 105. Both the coil 104 and the transmission rod 105 are disposed inside the housing 101. The coil 104 is connected to the transmission rod 105 in a driving connection, and the transmission rod 105 is connected to the moving contact 103.

[0068] When the coil 104 is energized, the coil 104 drives the moving contact 103 to engage with the stationary contact 102 via the transmission rod 105. When the coil 104 is de-energized, the transmission rod 105 resets under the action of gravity or elastic force, thereby disengaging the moving contact 103 from the stationary contact 102.

[0069] In some embodiments provided by this utility model, the outer casing 101 includes a housing 1013 and a cover 1014.

[0070] The housing 1013 has an opening, and the cover 1014 is detachably closed in the opening. The polygonal hole 1011 is provided on the housing wall of the housing 1013 away from the opening.

[0071] In this embodiment, an opening is provided on the housing 1013 to facilitate the installation or removal of components inside the housing 1013. A cover 1014 is detachably closed to the opening to allow the housing 1013 to be closed or opened.

[0072] Alternatively, the cover 1014 can be detachably connected to the housing 1013 via a snap-fit ​​structure or threaded fasteners.

[0073] It is understood that the features or technical means in the above embodiments can be combined with each other. Based on this, in some embodiments provided by this utility model, the relay 1 includes a housing 101, a contact point and a moving contact 103.

[0074] The outer casing 101 has a polygonal hole 1011 that communicates with the interior of the outer casing 101, meaning the polygonal hole 1011 penetrates the casing wall of the outer casing 101. A stationary contact 102 passes through the polygonal hole 1011, with one end of the stationary contact 102 located inside the outer casing 101 and the other end located outside the outer casing 101. The portion of the stationary contact 102 located outside the outer casing 101 is used to connect to the busbar 2.

[0075] The stationary contact 102 includes a prism structure 1021 and a connecting post 1022. The prism structure 1021 is located at one end of the stationary contact 102 away from the moving contact 103, and at least a portion of the prism structure 1021 passes through a polygonal hole 1011. The polygonal hole 1011 limits the prism structure 1021 in the circumferential direction. The number of sides of the prism structure 1021 is the same as the number of sides of the polygonal hole 1011, and they correspond one-to-one.

[0076] The prism structure 1021 has a connecting portion 1023 at one end facing the moving contact 103, and a connecting post 1022 is a cylindrical structure. The connecting post 1022 is connected to the end of the connecting portion 1023 away from the prism structure 1021. The cross-sectional area of ​​the connecting portion 1023 is smaller than the cross-sectional area of ​​the prism structure 1021, and the cross-sectional area of ​​the connecting portion 1023 is larger than the cross-sectional area of ​​the connecting post 1022.

[0077] The end of the connecting post 1022 away from the prism structure 1021 is configured as a tapered structure 1024, and the cross-sectional area of ​​the tapered structure 1024 gradually decreases along the direction from the prism structure 1021 to the connecting post 1022. The end of the tapered structure 1024 away from the prism structure 1021 is used to engage with the moving contact 103.

[0078] The movable contact 103 is reciprocally disposed inside the housing 101 and is used to engage or disengage with the connecting post 1022.

[0079] It is understood that in this embodiment, relay 1 combines the features of the above embodiments, and thus integrates the corresponding technical effects.

[0080] This utility model embodiment also provides a battery assembly.

[0081] Specifically, the battery assembly includes a busbar 2 and a relay 1 as described above. The busbar 2 is connected to the portion of the stationary contact 102 located outside the housing 101.

[0082] It should be noted that the battery assembly includes relay 1, and therefore includes all the advantages of relay 1 mentioned above.

[0083] Optionally, the busbar 2 is welded to the stationary contact 102. For example, the busbar 2 and the stationary contact 102 can be connected by laser welding.

[0084] This utility model embodiment also provides an electrical device.

[0085] Specifically, the electrical device includes the relay 1 as described above or the battery assembly as described above.

[0086] It should be noted that the electrical device includes relay 1, and therefore includes all the advantages of relay 1 mentioned above.

[0087] It should also be noted that electrical devices include, but are not limited to, new energy vehicles or energy storage systems.

[0088] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A relay, characterized in that, include: The outer shell (101) is provided with a polygonal hole (1011) which communicates with the interior of the outer shell (101); A stationary contact (102) is provided through the polygonal hole (1011), with one end of the stationary contact (102) located inside the housing (101) and the other end located outside the housing (101). The stationary contact (102) includes a prism structure (1021), at least a portion of which is located inside the polygonal hole (1011). The wall of the polygonal hole (1011) limits the prism structure (1021) in the circumferential direction. A movable contact (103) is provided within the housing (101) and is reciprocally movable, and is used to engage or disengage with the stationary contact (102).

2. The relay according to claim 1, characterized in that, The prism structure (1021) is located at one end of the stationary contact (102) away from the moving contact (103). The stationary contact (102) also includes a connecting post (1022), which is a cylindrical structure. One end of the connecting post (1022) is connected to the prism structure (1021), and the other end extends toward the moving contact (103).

3. The relay according to claim 2, characterized in that, The prism structure (1021) is an aluminum prism, and the connecting column (1022) is a copper connecting column. The prism structure (1021) and the connecting column (1022) are welded together.

4. The relay according to claim 2, characterized in that, The outer peripheral wall of the prism structure (1021) facing the connecting column (1022) is provided with an annular groove (1026) so that the end of the prism structure (1021) facing the connecting column (1022) forms a connecting part (1023). The cross-sectional area of ​​the connecting part (1023) is smaller than the cross-sectional area of ​​the prism structure (1021), and the cross-sectional area of ​​the connecting part (1023) is larger than the cross-sectional area of ​​the connecting column (1022).

5. The relay according to claim 2, characterized in that, The stationary contact also includes a tapered structure (1024), which is located at the end of the connecting post (1022) away from the prism structure (1021), and the cross-sectional area of ​​the tapered structure (1024) gradually decreases along the direction from the prism structure (1021) to the connecting post (1022).

6. The relay according to any one of claims 1-5, characterized in that, The stationary contact (102) has a blind hole (1025) on its end face away from the moving contact (103).

7. The relay according to any one of claims 1-5, characterized in that, The outer casing (101) is provided with a partition (1012), and there are two polygonal holes (1011). The two polygonal holes (1011) are distributed on both sides of the partition (1012). There are two stationary contacts (102), and the stationary contacts (102) are correspondingly inserted through the polygonal holes (1011).

8. The relay according to any one of claims 1-5, characterized in that, The outer casing (101) includes a shell (1013) and a cover (1014). The shell (1013) has an opening, and the cover (1014) is detachably closed in the opening. The polygonal hole (1011) is provided on the shell wall of the shell (1013) away from the opening.

9. A battery assembly, characterized in that, Includes a bus (2) and a relay (1) as claimed in any one of claims 1-8, wherein the bus (2) is connected to the portion of the stationary contact (102) located outside the housing (101).

10. An electrical appliance, characterized in that, Includes the relay (1) as described in any one of claims 1-8 or the battery assembly as described in claim 9.

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