Conversion switch and energy storage system
By introducing two moving contact sections and a drive mechanism into the changeover switch, combined with the magnetic circuit section and the push card, single-sided switching of the moving contact is realized, which solves the problem of poor adaptability of circuits with large current carrying capacity in the prior art, reduces the design requirements, and adapts to the switching of circuits with large current carrying capacity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-04-07
AI Technical Summary
Existing changeover switches have high requirements for moving contact design and are not suitable for switching circuits with significantly different current carrying capacities, and cannot effectively adapt to the switching needs of circuits with large and small current carrying capacities.
It adopts a changeover switch design with two moving contact parts. The first and second moving contact parts are driven by a drive mechanism to alternately contact the stationary contact part. Combined with the magnetic circuit part and the push card, the moving contact is switched on one side to meet the needs of different current-carrying circuits.
The design of the moving contact part is separated according to the current carrying capacity of the circuit, which reduces the design requirements and improves adaptability, especially in high current carrying capacity circuits where it can still switch effectively.
Smart Images
Figure CN224096582U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to switch technical field, especially a kind of conversion switch and energy storage system. BACKGROUND
[0002] Conversion switch is also called conversion switch, combination switch, and is a kind of switch that switches multiple circuits, which is composed of multiple contacts, and when switching circuits, the circuit is changed from one connection to another connection. At present, the conversion switch of prior art generally includes a contact unit or a plurality of contact units connected in series, each contact unit includes a moving contact and two static contacts, and the moving contact is switched with the two static contacts when being driven. This conversion switch is suitable for two circuits with similar current size, and is not suitable for two circuits with large difference in current size. This is because if the moving contact is designed according to the large current, the moving contact needs to be switched on both sides, the movement stroke is large, and the structure design of the moving contact is required to be high, and if the moving contact is designed according to the small current, it is not suitable for the large current circuit. SUMMARY
[0003] The utility model provides a kind of conversion switch and energy storage system according to the technical problems existing in prior art, it has two moving contact parts, and two moving contact parts are designed separately according to the different current of two circuits switched.
[0004] The utility model solves the technical problems by adopting the technical scheme of a kind of conversion switch, including first moving contact part, second moving contact part, static contact part and driving mechanism, and driving mechanism drives first moving contact part and second moving contact part to contact static contact part alternately.
[0005] In a preferred embodiment, the driving mechanism includes a magnetic circuit portion and a push card, the armature of the magnetic circuit portion is connected to the first moving contact part and the second moving contact part through the push card, and the armature drives the push card to move when switching between attraction and release states.
[0006] In a preferred embodiment, the push card includes a push body and two connecting rods extending in the same direction on the push body, the push body is connected to the armature, the first moving contact part and the second moving contact part are located between the two connecting rods, and the two connecting rods are respectively provided with a first card slot connected to the first moving contact part and a second card slot connected to the second moving contact part.
[0007] In a preferred embodiment, it further includes an auxiliary switch for indicating the working state of the first moving contact part or the second moving contact part, the auxiliary switch is driven by the push card to realize closing or opening, and the auxiliary switch is a micro switch.
[0008] In a preferred embodiment, the first moving contact portion and the second moving contact portion are located on opposite sides of the stationary contact portion.
[0009] In a preferred embodiment, the stationary contact portion includes a first stationary contact and a second stationary contact, the first moving contact portion is in contact with or separate from a first stationary contact point provided on the first stationary contact; one end of the second moving contact portion is fixed to the first stationary contact, and the other end of the second moving contact portion is in contact with or separate from a second stationary contact point provided on the second stationary contact.
[0010] In a preferred embodiment, the stationary contact portion includes a stationary contact with a first stationary contact point and a second stationary contact point. The first stationary contact point and the second stationary contact point are located on opposite sides of the stationary contact. The first moving contact portion is in contact with or separates from the first stationary contact point, and the second moving contact portion is in contact with or separates from the second stationary contact point.
[0011] In a preferred embodiment, the first moving contact portion adopts a short-circuit resistant structure, which includes a moving contact and a reaction spring. One end of the moving contact is rotatably connected to a contact lead, and a flexible conductive element is electrically connected between one end of the moving contact and the contact lead. The other end of the moving contact is provided with a first moving contact point for contacting or separating from the stationary contact portion. The reaction spring is provided on the side of the moving contact opposite to the stationary contact portion.
[0012] In a preferred embodiment, there are multiple moving contacts arranged in parallel, and each moving contact is provided with a first moving contact point and a reaction spring.
[0013] In a preferred embodiment, the second moving contact portion includes a moving spring that has a second moving contact for contacting or separating from the stationary contact portion.
[0014] This utility model also provides an energy storage system, including a charging and discharging circuit and a pre-charging circuit, and further including a changeover switch as described above. A first contact switch, composed of a first moving contact portion and a stationary contact portion, is connected to the charging and discharging circuit, and a second contact switch, composed of a second moving contact portion and a stationary contact portion, is connected in parallel with the pre-charging circuit.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] 1. Since this utility model includes a first moving contact part, a second moving contact part, a stationary contact part and a driving mechanism, and the driving mechanism drives the first moving contact part and the second moving contact part to alternately contact the stationary contact part, this utility model is convenient to design two moving contact parts separately according to the different current carrying capacity of the two circuits being switched, and both moving contact parts only need to be switched on one side. Therefore, even if a large current carrying capacity design is required, it is beneficial to reduce the design requirements.
[0017] 2. The driving mechanism of this utility model preferably includes the magnetic circuit part and the push card, which has the characteristics of simple structure and low cost.
[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the present invention is not limited to the embodiments. Attached Figure Description
[0019] Fig. 1 This is an exploded view of the changeover switch of this utility model (excluding the housing and auxiliary switch);
[0020] Fig. 2 This is a three-dimensional structural diagram of the changeover switch of this utility model (excluding the outer casing and auxiliary switch);
[0021] Fig. 3 This is a structural schematic diagram of the present invention (excluding the outer casing);
[0022] In the diagram, 1. First moving contact; 11. Moving contact; 111. First moving contact point; 12. Reaction spring; 13. Contact lead-out foot; 14. Flexible conductive element; 15. Rotating shaft; 2. Second moving contact; 21. Moving spring; 22. Second moving contact point; 3. First stationary contact; 31. First stationary contact point; 4. Second stationary contact; 41. Second stationary contact point; 5. Magnetic circuit part; 51. Coil frame; 52. Coil; 53. Iron core; 54. Armature; 55. Yoke; 56. Restoration spring; 6. Pushing clip; 61. Pushing body; 611. Third clip slot; 62. Connecting rod; 621. First clip slot; 622. Second clip slot; 7. Auxiliary switch. Detailed Implementation
[0023] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "multiple" refers to two or more.
[0024] Please see Figs. 1-3 As shown, a changeover switch of this utility model includes a first moving contact portion 1, a second moving contact portion 2, a stationary contact portion, and a driving mechanism. The driving mechanism drives the first moving contact portion 1 and the second moving contact portion 2 to alternately contact the stationary contact portion.
[0025] The first moving contact portion 1 and the second moving contact portion 2 are located on opposite sides of the stationary contact portion. The stationary contact portion specifically includes a first stationary contact 3 and a second stationary contact 4, which are arranged approximately perpendicular to the distribution direction of the first moving contact portion 1 and the second moving contact portion 2. The first moving contact portion 1 contacts or separates from the first stationary contact point 31 provided on the first stationary contact 3; one end of the second moving contact portion 2 is fixed to the first stationary contact 3, and the other end contacts or separates from the second stationary contact point 41 provided on the second stationary contact 4. In other embodiments, the stationary contact portion includes a stationary contact with a first stationary contact point and a second stationary contact point, located on opposite sides of the stationary contact, with the first moving contact portion contacting or separating from the first stationary contact point, and the second moving contact portion contacting or separating from the second stationary contact point.
[0026] In a preferred embodiment, the drive mechanism includes a magnetic circuit portion 5 and a pusher 6. The armature 54 of the magnetic circuit portion 5 is connected to the first moving contact portion 1 and the second moving contact portion 2 via the pusher 6. When the armature 54 switches between engaging and disengaging states, it drives the pusher 6 to move, causing the pusher 6 to drive the first moving contact portion 1 and the second moving contact portion 2 to alternately contact the stationary contact portion. In other embodiments, the drive mechanism includes a motor and a transmission assembly. The motor is driveably connected to the first and second moving contact portions via the transmission assembly.
[0027] In this embodiment, the pusher 6 includes a pusher body 61 and two connecting rods 62 disposed on the pusher body 61 and extending in the same direction. The pusher body 61 is connected to the armature 54. The first moving contact portion 1 and the second moving contact portion 2 are located between the two connecting rods 62. The two connecting rods 62 are respectively provided with a first slot 621 that connects and cooperates with the first moving contact portion 1 and a second slot 622 that connects and cooperates with the second moving contact portion 2. The pusher body 61 is provided with a third slot 611, which is used to connect the armature 54.
[0028] In this embodiment, the first moving contact portion 1 adopts a short-circuit resistant structure, which includes a moving contact 11 and a reaction spring 12. One end of the moving contact 11 is rotatably connected to one end of a contact lead 13 via a rotating shaft 15, and a flexible conductive element 14 is electrically connected between one end of the moving contact 11 and one end of the contact lead 13. The other end of the moving contact 11 is provided with a first moving contact 111 for contacting or separating from the stationary contact portion (i.e., the first stationary contact 3). The reaction spring 12 is provided on the side of the moving contact 11 facing away from the stationary contact portion. As a preferred embodiment, the first moving contact portion 1 has multiple moving contacts 11 arranged in parallel. Each moving contact 11 is provided with a first moving contact point and a reaction spring 12. This achieves a parallel structure of multiple contact points, improving current carrying capacity. Furthermore, it ensures that when the first moving contact portion 1 is closed with the stationary contact portion, each first moving contact point of the first moving contact portion 1 reliably contacts the stationary contact portion (i.e., the first stationary contact 3), preventing uneven surfaces caused by machining errors that would prevent some first moving contacts from contacting the stationary contact portion. The first slot 621 of the connecting rod 62 is connected to both the moving contact 11 and the reaction spring 12, which is used to achieve contact overtravel.
[0029] The second moving contact portion 2 includes a moving spring 21, which has a second moving contact 22 for contacting or separating from the stationary contact portion. Specifically, one end of the moving spring 21 is fixed to the first stationary contact 3, and the moving spring 21 and the first stationary contact 3 can be fixed by riveting or welding. The other end of the moving spring 21 is provided with the second moving contact 22. In this embodiment, two first moving contacts and two second moving contacts 22 are used as examples, and correspondingly, two first stationary contacts 31 and two second stationary contacts 41 are also provided.
[0030] This invention also includes an auxiliary switch for indicating the working state of the first moving contact portion 1 or the second moving contact portion 2. This auxiliary switch is driven by the push card 6 to achieve closure or opening. Specifically, the auxiliary switch is a micro switch located on one side of the push body 61 of the push card 6 and is driven by the push body 61.
[0031] In this embodiment, the magnetic circuit part 5 includes, in addition to the armature 54, a coil frame 51 with a coil 52 wound around it, a yoke 55, an iron core 53, and a restoring spring 56. The iron core 53 passes through the shaft hole of the coil frame 51. The yoke 55 is L-shaped, with one side fixedly connected to one end of the iron core 53 and the other side located outside the coil frame 51. The armature 54 is rotatably positioned at the blade edge on the other side of the yoke 55 by means of the restoring spring 56. The armature 54 is L-shaped, with one side used for magnetic attraction with the other end of the iron core 53, and the other side connected to the push card 6 to push the push card 6 to move. Specifically, the other side of the armature 54 is inserted into the third slot 611 provided in the push body 61.
[0032] This utility model also includes a housing (not shown in the figure), and the aforementioned drive mechanism, first moving contact portion 1, second moving contact portion 2 and stationary contact portion are disposed inside the housing.
[0033] This utility model discloses a changeover switch in which, in its initial state, the moving contact 11 is separated from the first stationary contact 3, and the moving spring 21 is in contact with the second stationary contact 4. When the coil 52 is energized, the magnetic circuit 5 generates a magnetic field, and one side of the armature 54 is attracted by the iron core 53 and rotates. During this process, the other side of the armature 54 pushes the pusher 6 to move away from the magnetic circuit 5, causing the two connecting rods 62 of the pusher 6 to drive the moving contact 11 to move closer to the first stationary contact 3, so that the first moving contact point on the moving contact 11 contacts the first stationary contact point 31 on the first stationary contact 3. At the same time, the two connecting rods 62 of the pusher 6 drive the other end of the moving spring 21 to move away from the second stationary contact 4, so that the second moving contact point 22 on the moving spring 21 separates from the second stationary contact point 41 of the second stationary contact 4. When coil 52 is de-energized, the magnetic field generated by magnetic circuit part 5 disappears. Armature 54 swings back to its original position under the action of reset spring 56, and drives push card 6 to move in the opposite direction. Push card 6 drives moving contact 11 to move away from first stationary contact 3, so that the first moving contact on moving contact 11 separates from the first stationary contact 31 on first stationary contact 3. At the same time, moving spring 21 moves towards second stationary contact 4 under its own reaction force or driven by push card 6, so that the second moving contact 22 on moving spring 21 contacts the second stationary contact 41 of second stationary contact 4.
[0034] This utility model discloses a changeover switch that can be applied to an energy storage system. The energy storage system includes a charging and discharging circuit and a pre-charging circuit. A pre-charging resistor is connected to the pre-charging circuit. In application, a first contact switch composed of a first moving contact part 1 and a first stationary contact part 3 is connected to the charging and discharging circuit, and a second contact switch composed of a second moving contact part 2 and a second stationary contact part 4 is connected in parallel with the pre-charging resistor.
[0035] In the initial state, the second contact switch is closed. The charging and discharging circuit is usually also connected to a switch assembly for controlling whether the charging and discharging circuit is open or closed. When it is necessary to connect the charging and discharging circuit, the switch assembly closes, and the capacitor or similar capacitive load is charged through the pre-charging resistor. When the current drops to a certain level, the battery management system detects that the voltage difference of the battery pack has reached a balance, and the coil of the magnetic circuit part 5 is energized, causing the first contact switch to close. At the same time, the second contact switch opens, so that the charging and discharging circuit can work normally. Meanwhile, the pre-charging circuit is disconnected to avoid shunting and energy consumption.
[0036] The first contact switch mentioned above is located in the charging and discharging circuit and has a relatively large current carrying capacity (around 400A). Therefore, the first moving contact part 1 adopts a short-circuit protection design. The second contact switch is used for pre-charging and has a relatively small current carrying capacity (around 50A). Therefore, the second contact switch can be implemented using a moving spring 21 with a relatively small current carrying capacity.
[0037] Therefore, the present invention provides a changeover switch that uses two moving contact parts (i.e., the first moving contact part 1 and the second moving contact part 2) to switch between two circuits. This makes it easy to design the two moving contact parts separately according to the different current carrying capacity of the two circuits being switched, and both moving contact parts only need to be switched on one side. Therefore, even when designing for large current carrying capacity, it is beneficial to reduce design requirements.
[0038] The present invention provides an energy storage system, including a charging and discharging circuit and a pre-charging circuit, wherein a pre-charging resistor is connected to the pre-charging circuit; it also includes a changeover switch as described above, wherein a first contact switch composed of a first moving contact portion 1 and a stationary contact portion is connected to the charging and discharging circuit, and a second contact switch composed of a second moving contact portion 2 and a stationary contact portion is connected in parallel with the pre-charging circuit.
[0039] For details on the structure and working principle of changeover switches, please refer to the previous description; they will not be repeated here.
[0040] The present invention relates to a changeover switch and a battery energy storage system. The parts not described herein are the same as or can be implemented using existing technologies.
[0041] The above embodiments are only used to further illustrate a switching type and energy storage system of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.
Claims
1. A changeover switch, characterized in that: It includes a first moving contact portion, a second moving contact portion, a stationary contact portion, and a driving mechanism. The driving mechanism drives the first moving contact portion and the second moving contact portion to alternately contact the stationary contact portion. The driving mechanism includes a magnetic circuit portion and a pusher. The armature of the magnetic circuit portion is connected to the first moving contact portion and the second moving contact portion through the pusher. When the armature switches between the attracting and releasing states, it drives the pusher to move.
2. The changeover switch according to claim 1, characterized in that: The pusher includes a pusher body and two connecting rods disposed on the pusher body and extending in the same direction. The pusher body is connected to the armature. The first moving contact portion and the second moving contact portion are located between the two connecting rods. The two connecting rods are respectively provided with a first slot that connects and cooperates with the first moving contact portion and a second slot that connects and cooperates with the second moving contact portion.
3. The changeover switch according to claim 1 or 2, characterized in that: It also includes an auxiliary switch for indicating the working state of the first moving contact portion or the second moving contact portion, the auxiliary switch being driven by the push card to achieve closure or opening; the auxiliary switch is a micro switch.
4. The changeover switch according to claim 1, characterized in that: The first moving contact portion and the second moving contact portion are located on opposite sides of the stationary contact portion.
5. The changeover switch according to claim 1, characterized in that: The stationary contact portion includes a first stationary contact and a second stationary contact. The first moving contact portion is in contact with or separates from a first stationary contact point provided on the first stationary contact. One end of the second moving contact portion is fixed to the first stationary contact, and the other end of the second moving contact portion is in contact with or separates from a second stationary contact point provided on the second stationary contact.
6. The changeover switch according to claim 1, characterized in that: The stationary contact portion includes a stationary contact, which has a first stationary contact point and a second stationary contact point. The first stationary contact point and the second stationary contact point are located on opposite sides of the stationary contact. The first moving contact portion is in contact with or separates from the first stationary contact point, and the second moving contact portion is in contact with or separates from the second stationary contact point.
7. The changeover switch according to claim 1, 4, 5, or 6, characterized in that: The first moving contact portion adopts a short-circuit resistant structure, which includes a moving contact and a reaction spring. One end of the moving contact is rotatably connected to a contact lead-out foot, and a flexible conductive element is electrically connected between one end of the moving contact and the contact lead-out foot. The other end of the moving contact is provided with a first moving contact point for contacting or separating from the stationary contact portion. The reaction spring is provided on the side of the moving contact opposite to the stationary contact portion.
8. The changeover switch according to claim 7, characterized in that: The moving contact is provided in multiple ways, and the multiple moving contacts are arranged in parallel. Each moving contact is provided with the first moving contact point and the reaction spring.
9. The changeover switch according to claim 1, 4, 5, or 6, characterized in that: The second moving contact portion includes a moving spring, which has a second moving contact for contacting or separating from the stationary contact portion.
10. An energy storage system, comprising a charging / discharging circuit and a pre-charging circuit, characterized in that: It also includes a changeover switch as described in any one of claims 1-9, wherein a first contact switch consisting of a first moving contact portion and a stationary contact portion is connected to the charging and discharging circuit, and a second contact switch consisting of a second moving contact portion and a stationary contact portion is connected in parallel with the pre-charging circuit.