Relay, power distribution device, battery pack and electric equipment

Abstract

The embodiment of the invention provides a relay, a power distribution device, a battery pack and electric equipment, and belongs to the technical field of relays. The relay includes: a housing; a driving assembly; the first relay assembly comprises a first movable contact and a first static contact, and a first interval is formed between the first movable contact and the first static contact; the second relay assembly comprises a second movable contact and a second static contact, the second movable contact is elastically connected with the first movable contact, a second interval is formed between the second movable contact and the second static contact, and the second interval is larger than the first interval; the driving assembly enables the first movable contact and the first static contact to be closed before the second movable contact and the second static contact. After the second movable contact and the second static contact are closed, the first movable contact moves away from the first static contact under the elastic effect so as to be disconnected with the first static contact. Through the arrangement of a pure mechanical structure, sequence control of loop closing is achieved, the structure is simpler and more compact, and control is easy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relays, and in particular to a relay, a power distribution device, a battery pack and a power consuming device. BACKGROUND

[0002] When a battery is charging or discharging, a pre-charging circuit needs to be closed first to balance the voltage and limit the current, and then a main circuit between the battery and a charging source or a power consuming device is closed, and subsequently the pre-charging circuit is disconnected to realize charging or discharging.

[0003] In the prior art, a separate pre-charging relay and a main relay need to be provided, and the two are connected through a timing control circuit to complete the sequential actions in the charging or discharging process.

[0004] However, such a configuration makes the structure of the relay complex. SUMMARY

[0005] The embodiments of the present application provide a relay, a power distribution device, a battery pack and a power consuming device to solve the problem of complex structure of the existing relay.

[0006] In a first aspect, the embodiments of the present application provide a relay, comprising:

[0007] a housing;

[0008] a driving assembly, the driving assembly being arranged in the housing, and a part of the driving assembly being movable relative to the housing;

[0009] a first relay assembly, the first relay assembly comprising a first movable contact and a first stationary contact, the first movable contact being connected to the driving assembly, the first stationary contact being connected to the housing, and the first movable contact and the first stationary contact having a first interval therebetween, the first movable contact being configured to be closed or disconnected with the first stationary contact;

[0010] a second relay assembly, the second relay assembly comprising a second movable contact and a second stationary contact, the second movable contact being elastically connected to the first movable contact, the second stationary contact being connected to the housing, and the second movable contact and the second stationary contact having a second interval therebetween, the second interval being greater than the first interval, the first movable contact being configured to be closed or disconnected with the first stationary contact.

[0011] In a possible implementation, the relay provided by the embodiments of the present application has that the first movable contact is elastically connected to the driving assembly.

[0012] In a possible implementation, the relay provided by the embodiments of the present application has that the first relay assembly further comprises a first elastic member, and the first movable contact is elastically connected to the driving assembly through the first elastic member.

[0013] The second relay assembly further comprises a second elastic member, and the second movable contact is elastically connected to the first movable contact through the second elastic member.

[0014] The elastic extension directions of the second elastic member and the first elastic member are consistent with the moving direction of the first movable contact.

[0015] In a possible implementation, the relay provided by the embodiment of the present application has the following technical effects: the rigidity of the second elastic member is greater than the rigidity of the first elastic member.

[0016] In a possible implementation, the relay provided by the embodiment of the present application has the following technical effects: the rigidity of the second elastic member is greater than or equal to 2.5 times the rigidity of the first elastic member, and less than or equal to 3 times the rigidity of the first elastic member.

[0017] In a possible implementation, the relay provided by the embodiment of the present application has the following technical effects: the rigidity of the first elastic member is greater than or equal to 50 N / m, and less than or equal to 80 N / m.

[0018] The rigidity of the second elastic member is greater than or equal to 120 N / m, and less than or equal to 180 N / m.

[0019] In a possible implementation, the relay provided by the embodiment of the present application has the following technical effects: the initial length of the second elastic member is less than the initial length of the first elastic member.

[0020] In a possible implementation, the relay provided by the embodiment of the present application has the following technical effects: the initial length of the first elastic member is greater than or equal to 7.5 mm, and less than or equal to 8.5 mm.

[0021] The initial length of the second elastic member is greater than or equal to 5.5 mm, and less than or equal to 6.5 mm.

[0022] In a possible implementation, the relay provided by the embodiment of the present application has the following technical effects: the first interval is greater than or equal to 1.9 mm, and less than or equal to 2.1 mm.

[0023] The second interval is greater than or equal to 4.8 mm, and less than or equal to 5.2 mm.

[0024] In a possible implementation, the relay provided by the embodiment of the present application has the following technical effects: the closing pressure of the second static contact is greater than the closing pressure of the first static contact.

[0025] In a possible implementation, the relay provided by the embodiment of the present application has the following technical effects: the closing pressure of the first static contact and the first movable contact is greater than or equal to 3 N.

[0026] The closing pressure of the second static contact and the second movable contact is greater than or equal to 8 N.

[0027] In a possible implementation, the relay provided by the embodiment of the present application has the following technical effects: the driving assembly comprises:

[0028] The coil is arranged in the shell;

[0029] The third elastic member is arranged in the coil, and one end of the third elastic member is connected with the shell.

[0030] The armature is arranged at the other end of the third elastic member, and the armature is connected with the first elastic member.

[0031] The moving direction of the first movable contact is consistent with the elastic expansion direction of the third elastic member.

[0032] In a possible implementation, the relay provided by the embodiment of the present application further includes a control member, the control member is electrically connected with the coil, and the control member is used to control the current size flowing through the coil.

[0033] In a possible implementation, the relay provided by the embodiment of the present application, the elastic stiffness of the third elastic member is greater than the elastic stiffness of the second elastic member.

[0034] In a possible implementation, the relay provided by the embodiment of the present application, the elastic stiffness of the third elastic member is greater than or equal to 200 N / m and less than or equal to 300 N / m.

[0035] In a possible implementation, the relay provided by the embodiment of the present application, the initial length of the third elastic member is greater than the initial length of the first elastic member.

[0036] In a possible implementation, the relay provided by the embodiment of the present application, the initial length of the third elastic member is greater than or equal to 9.5 mm and less than or equal to 10.5 mm.

[0037] In a possible implementation, the relay provided by the embodiment of the present application further includes an insulating member, the insulating member is arranged between the driving assembly and the first movable contact, so that the driving assembly and the first movable contact are insulated and connected.

[0038] In addition, the insulating member is arranged between the first movable contact and the second movable contact, so that the first movable contact and the second movable contact are insulated and connected.

[0039] In a second aspect, the embodiment of the present application provides a power distribution device, including a device body and the above-mentioned relay arranged on the device body.

[0040] In a third aspect, the embodiment of the present application provides a battery pack, including a battery pack body and the above-mentioned power distribution device arranged on the battery pack body.

[0041] In a fourth aspect, the embodiment of the present application provides a power consumption equipment, including an equipment body and the above-mentioned battery pack arranged on the equipment body.

[0042] The relay provided by the embodiment of the application, the power distribution device, the battery pack and the electric equipment, the relay comprises a shell, a driving assembly, a first relay assembly and a second relay assembly arranged in the shell, the first moving contact of the first relay assembly is connected with the driving assembly, the first stationary contact is relatively fixed with the shell and has a first interval with the first moving contact, the second moving contact of the second relay assembly is elastically connected with the first moving contact, and the second stationary contact is also relatively fixed with the shell and has a second interval with the second moving contact, and the second interval is greater than the first interval. When the battery is charged and discharged, the driving assembly drives the first moving contact and the second moving contact to move towards the first stationary contact and the second stationary contact at the same time, and because the second interval is greater than the first interval, the first moving contact is closed with the first stationary contact first, then the second moving contact is closed with the second stationary contact under the elastic action, and then the first moving contact is disconnected with the first stationary contact under the elastic action. The first moving contact and the first stationary contact are arranged in the pre-charging circuit, and the second moving contact and the second stationary contact are arranged in the main circuit, so that the pre-charging circuit is closed before the main circuit, and the pre-charging circuit is disconnected after the main circuit is closed, thereby realizing the sequential action in the charging and discharging process. Compared with arranging a separate pre-charging relay and a main relay and connecting them through a timing control circuit, the relay provided by the application realizes the sequential control of the circuit closing through the elastic connection between the first moving contact and the second moving contact and the interval between the two moving contacts and the respective stationary contacts, and the structure is more simple and compact and easy to control. BRIEF DESCRIPTION OF DRAWINGS

[0043] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate one embodiment consistent with the application and, together with the description, serve to explain the principles of the application.

[0044] Figure 1 The structure schematic diagram of the relay provided by the embodiment of the application;

[0045] Figure 2 For Figure 1 The process schematic diagram of the relay closing Figure 1 ;

[0046] Figure 3 For Figure 1 The process schematic diagram of the relay closing Figure 2 ;

[0047] Figure 4 For Figure 1 The process schematic diagram of the relay closing Figure 3 ;

[0048] Figure 5 For Figure 1 The process schematic diagram of the relay closing Figure 4 ;

[0049] Figure 6 For Figure 1 Process diagram of relay closing Figure 5 .

[0050] Reference signs:

[0051] 100 - housing;

[0052] 200 - drive assembly; 210 - coil; 220 - third elastic member; 230 - armature; 240 - control member;

[0053] 300 - first relay assembly; 310 - first movable contact; 320 - first stationary contact; 330 - first elastic member;

[0054] 400 - second relay assembly; 410 - second movable contact; 420 - second stationary contact; 430 - second elastic member;

[0055] 500 - insulating member.

[0056] The specific embodiments of the present application have been shown and described by the above drawings, and will be described in more detail hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0057] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. The embodiments described below and the features in the embodiments can be combined with each other without conflict.

[0058] In the prior art, when the battery is charging and discharging, the pre-charge circuit needs to be closed first, then the main circuit between the battery and the charging source or the electrical equipment is closed, and then the pre-charge circuit is disconnected. For this, a separate pre-charge relay and a main relay need to be set, and the two are connected through a timing control circuit to complete the sequential action in the charging and discharging process.

[0059] However, such a setting makes the relay structure more complex, and makes the relay control inconvenient and the reliability poor.

[0060] To overcome the defects in the prior art, the relay, power distribution device, battery pack and electric device provided by the embodiments of the present application, the relay comprises a housing and a driving assembly, a first relay assembly and a second relay assembly arranged in the housing, the first moving contact of the first relay assembly is connected with the driving assembly, the first stationary contact is relatively fixed with the housing and has a first interval with the first moving contact, the second moving contact of the second relay assembly is elastically connected with the first moving contact, and the second stationary contact is also relatively fixed with the housing and has a second interval with the second moving contact, the second interval being greater than the first interval. In this way, when the battery is charging and discharging, the driving assembly drives the first moving contact and the second moving contact to move towards the first stationary contact and the second stationary contact at the same time, and since the second interval is greater than the first interval, the first moving contact is closed with the first stationary contact first, then the second moving contact is closed with the second stationary contact under the elastic action, and subsequently the first moving contact is disconnected with the first stationary contact under the elastic action. By arranging the first moving contact and the first stationary contact in the pre-charging circuit and arranging the second moving contact and the second stationary contact in the main circuit, the pre-charging circuit can be closed before the main circuit, and the pre-charging circuit is disconnected after the main circuit is closed, thereby realizing the sequential action in the charging and discharging process. Compared with arranging a separate pre-charging relay and a main relay and connecting them through a timing control circuit, the relay provided by the present application realizes the sequential control of the circuit closure through the elastic connection between the first moving contact and the second moving contact and the interval between the two moving contacts and the respective stationary contacts by a pure mechanical structure, so that the structure is more simple and compact and easy to control.

[0061] The content of the present application will be described in detail below with reference to the drawings, so that those skilled in the art can understand the content of the present application more clearly and in detail.

[0062] Referring to Figures 1 to 6 The embodiments of the present application provide a relay, comprising:

[0063] The housing 100;

[0064] The driving assembly 200 is arranged in the housing 100, and part of the driving assembly 200 moves relative to the housing 100;

[0065] The first relay assembly 300 comprises a first moving contact 310 and a first stationary contact 320, the first moving contact 310 is connected with the driving assembly 200, the first stationary contact 320 is connected with the housing 100, the first moving contact 310 and the first stationary contact 320 have a first interval D1 therebetween, and the first moving contact 310 is used to close or disconnect with the first stationary contact 320;

[0066] The second relay assembly 400 includes a second movable contact 410 and a second fixed contact 420, the second movable contact 410 is elastically connected with the first movable contact 310, and the second fixed contact 420 is connected to the housing 100, and the second movable contact 410 and the second fixed contact 420 have a second interval D2, the second interval D2 is greater than the first interval D1, and the second movable contact 410 is used to close or open the second fixed contact 420.

[0067] It can be understood that the housing 100 has a mounting space for mounting the driving assembly 200, the first relay assembly 300 and the second relay assembly 400.

[0068] The driving assembly 200, the first relay assembly 300 and the second relay assembly 400 are all arranged in the housing 100, and the driving assembly 200 is arranged in one of the chambers of the housing 100 and can be partially moved relative to the housing 100.

[0069] The first relay assembly 300 and the second relay assembly 400 are arranged in another chamber of the housing 100, the first movable contact 310 of the first relay assembly 300 is connected with the driving assembly 200 to move under the driving of the driving assembly 200, and the second movable contact 410 of the second relay assembly 400 is elastically connected with the first movable contact 310, so that the first movable contact 310 can drive the second movable contact 410 to move, and under the elastic action, the movement of the second movable contact 410 has hysteresis compared with the first movable contact 310.

[0070] The first movable contact 310 and the first fixed contact 320 are arranged in a pre-charging circuit connected with the battery, the pre-charging circuit is provided with a pre-charging resistor, and the second movable contact 410 and the second fixed contact 420 are arranged in a main circuit connected with the battery, and the main circuit is connected with a charging source or a power consumption device. In this way, when the first movable contact 310 and the first fixed contact 320 are closed, the pre-charging circuit is conducted, so as to balance the voltage and limit the current between the battery and the charging source or the power consumption device, when the second movable contact 410 and the second fixed contact 420 are closed, the main circuit is conducted, and then the pre-charging circuit is disconnected, so as to transmit the current between the battery and the charging source or the power consumption device, and realize the charging and discharging.

[0071] Therefore, the relay provided by the embodiment of the present application comprises a shell 100, a driving assembly 200, a first relay assembly 300 and a second relay assembly 400 arranged in the shell 100, the first moving contact 310 of the first relay assembly 300 is connected with the driving assembly 200, the first stationary contact 320 is relatively fixed with the shell 100 and has a first interval D1 with the first moving contact 310, the second moving contact 410 of the second relay assembly 400 is elastically connected with the first moving contact 310, and the second stationary contact 420 is also relatively fixed with the shell 100 and has a second interval D2 with the second moving contact 410, the second interval D2 is greater than the first interval D1.

[0072] Therefore, when the battery is charged and discharged, the driving assembly 200 drives the first moving contact 310 and the second moving contact 410 to move towards the first stationary contact 320 and the second stationary contact 420 at the same time, and since the second interval D2 is greater than the first interval D1, the first moving contact 310 is closed with the first stationary contact 320 first, and then the second moving contact 410 is closed with the second stationary contact 420 under the elastic action, and then the first moving contact 310 is disconnected with the first stationary contact 320 under the elastic action.

[0073] The first moving contact 310 and the first stationary contact 320 are arranged in the pre-charging circuit, and the second moving contact 410 and the second stationary contact 420 are arranged in the main circuit, so that the pre-charging circuit is closed before the main circuit, and the pre-charging circuit is disconnected after the main circuit is closed, thereby realizing the sequential action in the charging and discharging process.

[0074] Compared with arranging a separate pre-charging relay and a main relay and connecting them through a timing control circuit, the relay provided by the present application realizes the sequential control of the circuit closure through the elastic connection between the first moving contact 310 and the second moving contact 410 and the control of the interval between the two moving contacts and the respective stationary contacts, and the structure is more simple and compact and easy to control.

[0075] It should be noted that in the relay provided by the embodiment of the present application, when the first relay assembly 300 is connected to the pre-charging circuit, the second relay assembly 400 can be connected to the main positive circuit or the main negative circuit; when the second relay assembly 400 is connected to the main positive circuit, the first relay assembly 300 can also be connected to the boost circuit; in addition, the relay provided by the embodiment of the present application can be flexibly applied to other related devices or systems which need to realize the timing control of the circuit closure, and the present application does not limit this.

[0076] Referring to Figure 1 The first moving contact 310 is elastically connected with the driving assembly 200.

[0077] Understandably, based on the elastic connection between the first moving contact 310 and the second moving contact 410, further elastically connecting the first moving contact 310 to the drive assembly 200 allows the first moving contact 310 to be completely within the elastic structure, which helps optimize the closing and opening process between the first moving contact 310 and the first stationary contact 320. During closing, the elastic force allows the first moving contact 310 to approach the first stationary contact 320 more smoothly, reducing bounce and improving contact reliability. During opening, the elastic effect allows the first moving contact 310 to quickly move away from the first stationary contact 320, reducing the possibility of arcing and improving the safety and stability of the relay.

[0078] This also makes it easier to ensure that the first moving contact 310 can be smoothly disconnected from the first stationary contact 320 while the second moving contact 410 remains tightly closed with the second stationary contact 420.

[0079] Among them, reference Figure 1 As shown, the first relay assembly 300 also includes a first elastic element 330, and the first moving contact 310 is elastically connected to the drive assembly 200 through the first elastic element 330.

[0080] The second relay assembly 400 also includes a second elastic element 430, and the second moving contact 410 is elastically connected to the first moving contact 310 through the second elastic element 430.

[0081] The elastic extension and contraction directions of the second elastic element 430 and the first elastic element 330 are both consistent with the movement direction of the first moving contact 310.

[0082] Both the first elastic element 330 and the second elastic element 430 can be configured as helical springs, making the relay structure simpler and more compact, and easier to implement timing control. The linear elasticity of the helical spring can accurately transmit the driving force of the drive assembly 200, causing the first moving contact 310 and the second moving contact 410 to move according to a preset displacement.

[0083] The stiffness and length of the helical spring can be precisely adjusted according to specific design requirements, thereby achieving precise control over the contact closing pressure, closing time, and opening time. For example, by appropriately selecting the stiffness of the first elastic element 330 and the second elastic element 430, it can be ensured that a suitable closing pressure is achieved between the first stationary contact 320 and the first moving contact 310, and between the second stationary contact 420 and the second moving contact 410, thus guaranteeing the stability of the circuit connection.

[0084] In some embodiments, the stiffness of the second elastic member 430 is greater than the stiffness of the first elastic member 330.

[0085] In this way, when the first movable contact 310 is first closed with the first stationary contact 320, the first movable contact 310 applies an upward force to the lower end of the second elastic member 430, and the upper end of the second elastic member 430 is driven to close the second movable contact 410 with the second stationary contact 420, and the second elastic member 430 as a whole tends to be compressed. After the second movable contact 410 is closed with the second stationary contact 420, the second elastic member 430 tends to be stretched to reset, and because the second elastic member 430 has a large stiffness, the second elastic member 430 can overcome the elastic force of the first elastic member 330 to stretch, and the first movable contact 310 is disconnected with the first stationary contact 320, completing the sequential operation.

[0086] For example, the stiffness of the second elastic member 430 is greater than or equal to 2.5 times the stiffness of the first elastic member 330, and less than or equal to 3 times the stiffness of the first elastic member 330.

[0087] This stiffness ratio range can ensure that during the charging and discharging process of the battery, when the driving assembly 200 drives the contacts to move, the first movable contact 310 can be smoothly closed with the first stationary contact 320 first, then the second movable contact 410 can be closed with the second stationary contact 420 at the right time, and then the first movable contact 310 is disconnected with the first stationary contact 320, ensuring that the sequence of closing the loop meets the design requirements.

[0088] In specific implementation, the stiffness of the first elastic member 330 is greater than or equal to 50 N / m, and less than or equal to 80 N / m;

[0089] The stiffness of the second elastic member 430 is greater than or equal to 120 N / m, and less than or equal to 180 N / m.

[0090] The stiffness of the first elastic member 330 can be set to 50 N / m, 60 N / m, 70 N / m, or 80 N / m, and the stiffness of the second elastic member 430 can be set to 120 N / m, 130 N / m, 140 N / m, 150 N / m, 160 N / m, 170 N / m, or 180 N / m, which is not limited in the present application.

[0091] In some embodiments, with reference to Figure 1 As shown in the figure, the initial length of the second elastic member 430 is less than the initial length of the first elastic member 330.

[0092] The shorter second elastic member 430 can reach the required elastic force more quickly when it is compressed, providing sufficient closing pressure for the second movable contact 410 and the second stationary contact 420, ensuring stable conduction of the main loop, and meeting the requirements of large current transmission of the main loop.

[0093] And the longer first elastic member 330 can make the closing pressure between the first moving contact 310 and the first stationary contact 320 relatively moderate, which can not only ensure the normal conduction of the pre-charge circuit, but also prevent the excessive wear of the contacts caused by excessive pressure, prolong the service life of the contacts, and also make the first moving contact 310 and the first stationary contact 320 easily disconnect after the second moving contact 410 and the second stationary contact 420 are closed.

[0094] In specific implementation, the initial length of the first elastic member 330 is greater than or equal to 7.5 mm and less than or equal to 8.5 mm;

[0095] The initial length of the second elastic member 430 is greater than or equal to 5.5 mm and less than or equal to 6.5 mm.

[0096] For example, the length of the first elastic member 330 can be set to 7.5 mm, 8.0 mm or 8.5 mm, and the length of the second elastic member 430 can be set to 5.5 mm, 6.0 mm or 6.5 mm, which are not limited in the present application.

[0097] In some embodiments, the relay provided by the embodiments of the present application has a first interval D1 greater than or equal to 1.9 mm and less than or equal to 2.1 mm;

[0098] The second interval D2 is greater than or equal to 4.8 mm and less than or equal to 5.2 mm.

[0099] The appropriate interval setting can ensure that the pre-charge circuit and the main circuit are closed and disconnected in the preset order during the charging and discharging of the battery, avoid abnormal conditions of the circuit, and ensure the voltage balance and stable current transmission between the battery and the charging source or the electrical equipment.

[0100] And, through the parameter setting of the first elastic member 330 and the second elastic member 430, the closing pressure of the second stationary contact 420 is greater than that of the first stationary contact 320.

[0101] In this way, the closing pressure of the second stationary contact 420 is greater than that of the first stationary contact 320, and the second elastic member 430 has a large stiffness to provide sufficient force to ensure a suitable closing pressure between the second moving contact 410 and the second stationary contact 420, and to ensure the stable conduction of the main circuit. The first elastic member 330 has a small stiffness to meet the closing pressure requirement of the first moving contact 310 and the first stationary contact 320 in the pre-charge circuit, while avoiding damage to the contacts caused by excessive pressure.

[0102] For example, the closing pressure of the first stationary contact 320 and the first moving contact 310 is greater than or equal to 3 N;

[0103] The closing pressure of the second stationary contact 420 and the second movable contact 410 is greater than or equal to 8 N.

[0104] The closing pressure of the first stationary contact 320 and the first movable contact 310 is greater than or equal to 3 N, which can ensure that the pre-charging circuit is reliably turned on during the charging and discharging of the battery. Sufficient closing pressure can reduce the contact resistance and reduce the heating phenomenon caused by poor contact, ensure the normal implementation of the voltage balance and current limiting function during the pre-charging process, and prepare for the subsequent conduction of the main circuit.

[0105] The closing pressure of the second stationary contact 420 and the second movable contact 410 is greater than or equal to 8 N, for carrying larger current. Higher closing pressure can make the contacts tightly contact, significantly reduce the contact resistance, reduce energy loss and heating, ensure the stable transmission of large current of the main circuit, avoid circuit failure caused by poor contact, such as overheating, fusing and the like, and improve the reliability and safety of the entire battery.

[0106] Also, in some embodiments, referring to Figures 1 to 6 As shown, the driving assembly 200 includes:

[0107] The coil 210 is arranged in the housing 100;

[0108] The third elastic member 220 is inserted into the coil 210, and one end of the third elastic member 220 is connected with the housing 100;

[0109] The armature 230 is arranged at the other end of the third elastic member 220, and the armature 230 is connected with the first elastic member 330;

[0110] The moving direction of the first movable contact 310 is consistent with the elastic expansion direction of the third elastic member 220.

[0111] In this way, the relay is an electromagnetic relay, which has simple and compact structure and is easy to control. When the coil 210 is powered, a magnetic field is generated, which generates a force on the armature 230. The armature 230 moves upward against the elastic force of the third elastic member 220, and since the armature 230 is connected with the first movable contact 310 through the first elastic member 330, and the first movable contact 310 is connected with the second movable contact 410 through the second elastic member 430, the movement of the armature 230 drives the first movable contact 310 and the second movable contact 410 to move.

[0112] The moving direction of the first movable contact 310 is consistent with the elastic expansion direction of the third elastic member 220, ensuring the efficiency and stability of the driving process. The expansion of the third elastic member 220 can be directly and smoothly converted into the linear movement of the first movable contact 310, avoiding additional friction and energy loss due to inconsistent movement directions, and ensuring the accuracy and reliability of the action of the first movable contact 310.

[0113] When the coil 210 is powered off, the magnetic field disappears, and the third elastic member 220 returns to its original state, pulling the armature 230 back to the initial position, and then making the first movable contact 310 and the second movable contact 410 also return to the initial position, realizing the automatic reset function of the contacts, so that the relay can work reliably under different control signals, improving the stability and operability of the entire circuit system.

[0114] The number of turns of the coil 210 can be set to be greater than or equal to 495 turns and less than or equal to 505 turns, and the direct current resistance at room temperature is 2.5Ω, so that the maximum suction force of the coil 210 under 24v current is 80N, and the armature 230 can be set to DT4C pure iron, the coercive force of which is less than or equal to 32A / m, and the mass is less than or equal to 50g, so that when the coil 210 is powered off, the armature 230 can be reset under the action of the third elastic member 220 with an acceleration of 0.5m / s².

[0115] In addition, the material of the first movable contact 310 can be AgSnO2 (containing 12% SnO2), and the contact diameter is 3mm, and the material of the second movable contact 410 can be CuW (containing 70% W), and the contact diameter is 5mm.

[0116] Further, referring to Figure 1 As shown in the figure, the driving assembly 200 further comprises a control member 240, the control member 240 is electrically connected with the coil 210, and the control member 240 is used for controlling the current size of the coil 210.

[0117] The control member 240 can change the current size of the coil 210, and the current size determines the strength of the magnetic field generated by the coil 210. By accurately controlling the current, the magnetic force on the armature 230 can be accurately adjusted, and then the elastic force on the first elastic member 330, the second elastic member 430 and the third elastic member 220 is adjusted, so as to realize the opening and timing control of the relay. For example, the controller can be connected with the battery management system of the vehicle.

[0118] The elastic stiffness of the third elastic member 220 is greater than the elastic stiffness of the second elastic member 430.

[0119] This configuration allows the third elastic element 220 to have the greatest elastic stiffness among the three elastic elements, so that the third elastic element 220 has a large elastic force when the second moving contact 410 and the second stationary contact 420 are closed. When the coil 210 is de-energized, the third elastic element 220 can quickly drive the first stationary contact 320 and the second stationary contact 420 to move down, and cause the second moving contact 410 and the second stationary contact 420 to quickly disconnect, avoiding arcing.

[0120] For example, the elastic stiffness of the third elastic element 220 is greater than or equal to 200 N / m and less than or equal to 300 N / m.

[0121] The elastic stiffness of the third elastic element 220 can be set to 200 N / m, 220 N / m, 240 N / m, 260 N / m, 280 N / m or 300 N / m, and this application does not limit it.

[0122] Furthermore, the initial length of the third elastic element 220 is greater than the initial length of the first elastic element 330.

[0123] The longer third elastic element 220 provides more travel space for the movement of the armature 230, ensuring that the first moving contact 310 has sufficient displacement to reliably close or open with the first stationary contact 320. After the coil 210 is de-energized, the third elastic element 220 can generate a larger restoring force when it rebounds, more forcefully driving the armature 230 back to its initial position.

[0124] For example, the initial length of the third elastic member 220 is greater than or equal to 9.5 mm and less than or equal to 10.5 mm.

[0125] The initial length of the third elastic member 220 can be set to 9.5 mm, 10.0 mm or 10.5 mm, and this application does not limit it.

[0126] In addition, refer to Figure 1 As shown, the relay provided in this application embodiment also includes an insulating member 500, which is disposed between the drive assembly 200 and the first moving contact 310 to make the drive assembly 200 and the first moving contact 310 insulated from each other.

[0127] Furthermore, an insulating member 500 is disposed between the first moving contact 310 and the second moving contact 410 to make the first moving contact 310 and the second moving contact 410 insulated from each other.

[0128] Specifically, the insulating element 500 can be an insulating disc, which is respectively disposed on the opposite side of the armature 230 and the first moving contact 310 and connected to the first elastic element 330. It is also disposed on the opposite side of the first moving contact 310 and the second moving contact 410 and connected to the second elastic element 430. In this way, the insulating element 500 is used to insulate the moving contact and the elastic element, so that the contact performance is more stable.

[0129] The following combination Figures 1 to 6 Taking the example of a battery equipped with this relay supplying power to a vehicle, the working process of the relay provided in this application embodiment will be explained as follows:

[0130] Reference Figure 1 and Figure 2 As shown, when the battery is powered off, the armature 230 is in the lower position under the action of the third elastic member 220. At the same time, the first moving contact 310 and the second moving contact 410 are separated from their corresponding stationary contacts. There is a first gap D1 between the first moving contact 310 and the first stationary contact 320, and a second gap D2 between the second moving contact 410 and the second stationary contact 420. The precharge circuit and the main circuit are both in the disconnected state.

[0131] Reference Figure 1 and Figure 3 As shown, when the battery receives the signal from the vehicle and starts the power-on process, the electromagnetic force of the coil 210 causes the third elastic element 220 to extend upward and the armature 230 to move upward. At the same time, under the connection of the first elastic element 330 and the second elastic element 430, the first moving contact 310 and the second positive moving contact approach their corresponding stationary contact.

[0132] Reference Figure 1 and Figure 4 As shown, by setting the stiffness ratio and initial length of the first elastic element 330 and the second elastic element 430, and setting the first interval D1 and the second interval D2 between the first moving contact 310 and the second moving contact 410 and their corresponding stationary contact, the precharge circuit is closed 20-50 ms after the coil 210 is energized, by utilizing the buffering effect of the second elastic element 430.

[0133] Reference Figure 1 and Figure 5 As shown, the second moving contact 410 further contacts the second stationary contact 420 under the action of the second elastic element 430, so that the main circuit closes 100-200 ms after the precharge circuit is closed;

[0134] Reference Figure 1 and Figure 6As shown, after the main loop is closed, the coil 210 current is adjusted to retract at least one of the first elastic member 330 and the third elastic member 220 by a stroke, so that the pre-charge loop is disconnected after the main loop is closed for 10-30 ms, but the main loop remains closed, that is, the battery pack continues to supply power in the power-on state;

[0135] When the battery pack is powered off, the coil 210 current is disconnected to disconnect the main loop, and the relay returns to Figure 2 the state shown.

[0136] The embodiments of the present application also provide a power distribution device, which comprises a device body and the relay in any of the above embodiments arranged on the device body.

[0137] The relay has been described in detail in the above embodiments, and will not be repeated here.

[0138] Further, the embodiments of the present application also provide a battery pack, which comprises a battery pack body and the power distribution device arranged on the battery pack body.

[0139] The embodiments of the present application also provide a power consumption device, which comprises a device body and the battery pack arranged on the device body.

[0140] The power distribution device, the battery pack and the power consumption device provided by the embodiments of the present application are provided by arranging the relay, the relay comprises a housing 100 and a driving assembly 200, a first relay assembly 300 and a second relay assembly 400 arranged in the housing 100, the first moving contact 310 of the first relay assembly 300 is connected with the driving assembly 200, the first stationary contact 320 is relatively fixed with the housing 100 and has a first interval D1 with the first moving contact 310, the second moving contact 410 of the second relay assembly 400 is elastically connected with the first moving contact 310, and the second stationary contact 420 is also relatively fixed with the housing 100 and has a second interval D2 with the second moving contact 410, the second interval D2 is greater than the first interval D1. In this way, during the battery charging and discharging, the driving assembly 200 drives the first moving contact 310 and the second moving contact 410 to move towards the first stationary contact 320 and the second stationary contact 420 at the same time, and since the second interval D2 is greater than the first interval D1, the first moving contact 310 is closed with the first stationary contact 320 first, and then the second moving contact 410 is closed with the second stationary contact 420 under the elastic action, and then the first moving contact 310 is disconnected with the first stationary contact 320 under the elastic action.

[0141] The first moving contact 310 and the first stationary contact 320 are arranged in the pre-charge loop, and the second moving contact 410 and the second stationary contact 420 are arranged in the main loop, so that the pre-charge loop is closed before the main loop, and the pre-charge loop is disconnected after the main loop is closed, realizing the sequential action in the charging and discharging process.

[0142] Compared with setting a separate pre-charging relay and a main relay and connecting the two through a timing control circuit, the relay provided by the application is connected through the elastic connection between the first moving contact 310 and the second moving contact 410, and the interval between the two moving contacts and the respective stationary contacts is controlled, so that the sequence control of the loop closure is realized by a pure mechanical structure, and the structure is more simple and compact and easy to control.

[0143] It should be noted that the phrases "one embodiment", "an embodiment", "some embodiments", "exemplary embodiment", "some embodiments" and the like as used herein do not necessarily refer to the same embodiment, although they can. The use of the terms "at least one" and "one or more" does not exclude the use of "zero or more", unless explicitly stated otherwise. Thus, such phrases can not be exhaustive when describing a particular feature, structure or characteristic, but such terms can also pertain to further or additional features, structures or characteristics.

[0144] In general, terminology can be understood at least in part from usage in context. For example, terms, words and / or phrases used in this patent document can be used according to their meaning in the context of the relevant art and / or as expressly given by a preceding or following sentence in this patent document.

[0145] It will be readily understood that the terms "on", "above", and "on top of", as used herein, should be interpreted in the broadest context to mean not only "directly on something" but also "on something with intervening feature(s) or layer(s) therebetween", and that "above" or "on top of" not only includes the meaning of "above" or "on top of something" but also can include the meaning of "above" or "on top of something" without intervening feature(s) or layer(s) therebetween (i.e., directly on something).

[0146] In addition, spatially relative terms, such as "beneath", "below", "lower", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90° or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0147] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A relay characterized by comprising: The application relates to a relay device, comprising: a housing (100); a driving assembly (200) arranged in the housing (100) and partially movable relative to the housing (100); a first relay assembly (300) comprising a first movable contact (310) connected to the driving assembly (200) and a first stationary contact (320) connected to the housing (100), the first movable contact (310) and the first stationary contact (320) having a first interval therebetween, the first movable contact (310) being configured to be closed or opened with the first stationary contact (320); a second relay assembly (400) comprising a second movable contact (410) elastically connected to the first movable contact (310) and a second stationary contact (420) connected to the housing (100), the second movable contact (410) and the second stationary contact (420) having a second interval therebetween, the second interval being greater than the first interval, the second movable contact (410) being configured to be closed or opened with the second stationary contact (420).

2. The relay according to claim 1, characterized in that The first movable contact (310) is elastically connected to the driving assembly (200).

3. The relay according to claim 2, characterized in that The first relay assembly (300) further comprises a first elastic member (330), the first movable contact (310) being elastically connected to the driving assembly (200) through the first elastic member (330). The second relay assembly (400) further comprises a second elastic member (430), the second movable contact (410) being elastically connected to the first movable contact (310) through the second elastic member (430). The elastic extension directions of the second elastic member (430) and the first elastic member (330) are consistent with the moving direction of the first movable contact (310).

4. The relay according to claim 3, characterized in that The rigidity of the second elastic member (430) is greater than the rigidity of the first elastic member (330).

5. The relay of claim 4, wherein The rigidity of the second elastic member (430) is greater than or equal to 2.5 times the rigidity of the first elastic member (330) and less than or equal to 3 times the rigidity of the first elastic member (330).

6. The relay of claim 5, wherein The rigidity of the first elastic member (330) is greater than or equal to 50 N / m and less than or equal to 80 N / m. The rigidity of the second elastic member (430) is greater than or equal to 120 N / m and less than or equal to 180 N / m.

7. The relay of claim 3, wherein The initial length of the second elastic member (430) is less than the initial length of the first elastic member (330).

8. The relay according to claim 7, characterized in that The initial length of the first elastic member (330) is greater than or equal to 7.5 mm and less than or equal to 8.5 mm. The initial length of the second elastic member (430) is greater than or equal to 5.5 mm and less than or equal to 6.5 mm.

9. The relay of claim 1, wherein The first interval is greater than or equal to 1.9 mm and less than or equal to 2.1 mm. The second interval is greater than or equal to 4.8 mm and less than or equal to 5.2 mm.

10. The relay of claim 1, wherein The closing pressure of the second stationary contact (420) is greater than the closing pressure of the first stationary contact (320).

11. The relay according to claim 10, characterized in that The closing pressure of the first stationary contact (320) and the first movable contact (310) is greater than or equal to 3 N; The closing pressure of the second stationary contact (420) and the second movable contact (410) is greater than or equal to 8 N.

12. A relay according to any one of claims 3-8, characterised in that The drive assembly (200) comprises: a coil (210) disposed in the housing (100); a third elastic member (220) inserted in the coil (210), and one end of the third elastic member (220) is connected with the housing (100); an armature (230) disposed at the other end of the third elastic member (220), and the armature (230) is connected with the first elastic member (330); The moving direction of the first movable contact (310) is consistent with the elastic expansion direction of the third elastic member (220).

13. The relay of claim 12, wherein, The drive assembly (200) further comprises a control member (240) electrically connected with the coil (210), and the control member (240) is used for controlling the current size of the coil (210).

14. The relay of claim 12, wherein, The elastic stiffness of the third elastic member (220) is greater than the elastic stiffness of the second elastic member (430).

15. The relay of claim 14, wherein, The elastic stiffness of the third elastic member (220) is greater than or equal to 200 N / m and less than or equal to 300 N / m.

16. The relay of claim 12, wherein, The initial length of the third elastic member (220) is greater than the initial length of the first elastic member (330).

17. The relay of claim 16, wherein, The initial length of the third elastic member (220) is greater than or equal to 9.5 mm and less than or equal to 10.5 mm.

18. The relay according to any one of claims 1 to 11, characterized in that Further comprising an insulating member (500) disposed between the drive assembly (200) and the first movable contact (310) to insulate and connect the drive assembly (200) and the first movable contact (310); And the insulating member (500) is disposed between the first movable contact (310) and the second movable contact (410) to insulate and connect the first movable contact (310) and the second movable contact (410).

19. A power distribution device, comprising: The device body and the relay as claimed in any one of claims 1-18 disposed on the device body.

20. A battery pack, characterized by The battery pack body and the power distribution device as claimed in claim 19 disposed on the battery pack body.

21. An electrical device, comprising: The equipment body and the battery pack as claimed in claim 20 disposed on the equipment body.

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