A BMS on-board transformer

Abstract

The utility model discloses a kind of BMS vehicle-mounted transformers, it includes plastic shell, the magnetic component group being contained in the plastic shell inside and the several metal terminals being inserted in the both sides of the plastic shell, receiving groove is provided on the plastic shell, the magnetic component group is at least provided with a group and is contained in the receiving groove, the magnetic component group includes the first magnetic ring with the isolation high pressure effect and the second magnetic ring with the noise reduction effect, the first magnetic ring with the second magnetic ring all include magnetic ring body and the several lead wires being led from the magnetic ring body, the lead wire is welded in the metal terminal to realize the electrical connection of both. The utility model can significantly improve the performance, reliability and production efficiency of BMS vehicle-mounted transformer, while reducing production cost.

Description

Technical Field

[0001] This utility model belongs to the field of electronic component technology, and in particular relates to a BMS vehicle-mounted transformer. Background Technology

[0002] BMS (Battery Management System) vehicle-mounted transformers are magnetic components used in new energy applications. They serve functions such as impedance matching, high-voltage isolation, and noise suppression, and are primarily used in battery management systems. Conventional BMS vehicle-mounted transformers combine their plastic housing and metal terminals using a molding process. This involves first stamping the metal terminals and then injection molding them into a single structure with the plastic housing, followed by cutting off the leads from the metal terminals. This method is complex, wastes metal materials, and results in high production costs.

[0003] To address the aforementioned issues, modular transformers have been designed. For example, Chinese Patent Publication CN204332600U discloses a network transformer, which includes a shell made of colloid, an interior groove containing a coil, an insulating adhesive between the groove and the coil, a locking slot at the edge of the shell, a welding groove between the locking slot and the groove, and a lead wire groove inside the shell. One end of the lead wire groove communicates with the edge of the groove, and the other end communicates with the locking slot. The lead wire groove passes through the welding groove. The transformer also includes a PCB base plate that matches the opening of the shell. The PCB base plate has pads corresponding to the welding groove, and metal terminals are provided on the welding side of the pads. This solution requires designing a PCB base plate, first designing the pads and metal terminals on the PCB base plate, positioning the PCB base plate at the bottom of the shell, and then welding the pads and leads together. This not only complicates the assembly process but also increases production costs due to the need to design a PCB base plate with pads and metal terminals.

[0004] Therefore, it is necessary to provide a BMS vehicle-mounted transformer to solve the above-mentioned technical problems. Utility Model Content

[0005] The main objective of this invention is to provide a BMS vehicle-mounted transformer that can significantly improve the performance, reliability, and production efficiency of BMS vehicle-mounted transformers, while reducing production costs.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: A BMS vehicle-mounted transformer, comprising a plastic housing, a magnetic component assembly housed inside the plastic housing, and a plurality of metal terminals inserted into both sides of the plastic housing. The plastic housing is provided with a receiving groove, and at least one set of the magnetic component assembly is provided and all are housed in the receiving groove. The magnetic component assembly includes a first magnetic ring with the function of isolating high voltage and a second magnetic ring with the function of reducing noise. Both the first magnetic ring and the second magnetic ring include a magnetic ring body and a plurality of leads extending from the magnetic ring body. The leads are welded to the metal terminals to achieve electrical connection between the two.

[0007] Furthermore, the metal terminal includes an insert portion whose lower end is inserted into the plastic housing, a first welding portion formed by bending horizontally upward to the left or right from the insert portion, and a second welding portion disposed between the insert portion and the first welding portion and extending horizontally forward or backward.

[0008] Furthermore, the first welded portion is located above the plastic housing.

[0009] Furthermore, the plastic housing has several mounting slots on both sides for mounting the metal terminals.

[0010] Furthermore, the mounting groove includes a first groove for fixing the insert portion and a second groove for accommodating the second welding portion.

[0011] Furthermore, both sides of the insertion part are provided with several fixing protrusions that can be inserted into the first groove.

[0012] Furthermore, the plastic housing has a wire groove on one side of the second cavity and a wire-holding groove on the other side of the second cavity. The wire groove, the second cavity, and the wire-holding groove are interconnected, and the wire groove is connected to the receiving groove.

[0013] Furthermore, the magnetic ring body is fixed in the receiving groove by dispensing adhesive.

[0014] Furthermore, the lead wire is welded to the second welding part by laser welding.

[0015] Furthermore, the magnetic component group is provided in two sets.

[0016] Compared with the prior art, the beneficial effects of this utility model of a BMS vehicle-mounted transformer are as follows: (1) The metal terminals are directly inserted into the plastic housing, which can realize the electrical connection with the lead wire of the magnetic component group and the electrical connection with other products. Compared with the existing technology, it saves the PCB base plate, realizes the electrical connection directly through the metal terminals, simplifies the structure, and reduces production costs and assembly complexity, and improves production efficiency. (2) The magnetic component group includes a first magnetic ring that isolates high voltage and a second magnetic ring that reduces noise. It simultaneously achieves high voltage isolation and electromagnetic interference suppression, thereby improving transformer safety and signal stability. The magnetic component group is provided with at least one set. When multiple sets of magnetic component groups are provided, they can specifically handle interference in different frequency bands and adapt to the needs of complex vehicle environments. (3) The wire groove connects the receiving groove and the second groove, and the wire clamping groove fixes the position of the lead wire; the lead wire passes through the wire groove and the second groove in sequence and is clamped into the wire clamping groove. After positioning, it is welded to ensure that the lead wire is accurately positioned above the second welding part, which facilitates automated welding, reduces manual intervention, and improves welding consistency and reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the BMS vehicle-mounted transformer according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the plastic shell according to an embodiment of the present invention; Figure 3 This is an embodiment of the present utility model. Figure 2 A magnified view of the structure at point A in the middle; Figure 4 This is a schematic diagram of the structure of the metal terminal in an embodiment of the present invention; The numbers in the image represent: 100-BMS vehicle-mounted transformer; 1-Plastic housing, 11-Receiving slot, 12-Mounting slot, 121-First slot, 122-Second slot, 13-Wire slot, 14-Wire clamping slot; 2-Magnetic component assembly, 21-First magnetic ring, 211-Magnetic ring body, 212-Lead wire, 22-Second magnetic ring; 3-Metal terminal, 31-Insertion part, 311-Fixing protrusion, 32-First welding part, 33-Second welding part. Detailed Implementation

[0018] Please refer to Figures 1-4This embodiment is a BMS vehicle-mounted transformer 100, which includes a plastic housing 1, a magnetic component group 2 housed inside the plastic housing 1, and a plurality of metal terminals 3 inserted on both sides of the plastic housing 1. The plastic housing 1 is provided with a receiving groove 11. At least one magnetic component group 2 is provided and is housed in the receiving groove 11. The magnetic component group 2 includes a first magnetic ring 21 with the function of isolating high voltage and a second magnetic ring 22 with the function of reducing noise. The first magnetic ring 21 and the second magnetic ring 22 both include a magnetic ring body 211 and a plurality of leads 212 led out from the magnetic ring body 211. The leads 212 are welded to the metal terminals 3 to realize the electrical connection between the two.

[0019] In this embodiment, two sets of magnetic component groups 2 are provided, namely, two first magnetic rings 21 and two second magnetic rings 22. The two sets of magnetic component groups 2 can specifically optimize interference in different frequency bands. In other embodiments, the number of magnetic component groups 2 can be set according to the actual situation, and the number of magnetic component groups 2 is not limited here.

[0020] In this embodiment, the magnetic ring body 211 is fixed in the receiving groove 11 by dispensing adhesive. The type and composition of the adhesive are not limited here; they can be selected according to the actual situation. In other embodiments, the magnetic ring body 211 can also be positioned in the receiving groove 11 by other methods, such as limiting structures or positioning structures. Furthermore, the posture of the magnetic ring body 211 in the receiving groove 11 is not limited; that is, the magnetic ring body 211 can be placed flat or upright, adjusted accordingly according to the size of the receiving groove 11. This is not restricted here. Several leads 212 are drawn out from the magnetic ring body 211. These leads include positive wires, negative wires, ground wires, etc., or wires of other polarities. Therefore, the number of leads 212 drawn out from the magnetic ring body 211 is not limited here and can be adjusted according to the actual situation.

[0021] The metal terminal 3 includes an insertion portion 31 that inserts its lower end into the plastic housing 1, a first welding portion 32 formed by bending horizontally upwards to the left or right from the insertion portion 31, and a second welding portion 33 disposed between the insertion portion 31 and the first welding portion 32 and extending horizontally forward or backward. The first welding portion 32 is used for welding with other products to realize the welding of the BMS transformer 100 to other products, and the second welding portion 33 is used for welding with the lead wire 212 to realize the electrical connection between the lead wire 212 and the metal terminal 3. The insertion portion 31 of the metal terminal 3 can be directly inserted into the plastic housing 1, the second welding portion 33 can realize the electrical connection with the lead wire 212 of the magnetic component assembly 2, and the first welding portion 32 can realize the electrical connection with the product. Compared with the prior art, the PCB base plate is reduced, and the metal terminal 3 can be used directly to realize the electrical connection with the lead wire 212 and other products, which simplifies the process and reduces production costs.

[0022] In this embodiment, laser welding can be used to weld the lead wire 212 onto the second welding part 33. This method offers high welding precision, a small heat-affected zone, and avoids damage to the plastic shell 1. It is suitable for automated production and improves the yield rate.

[0023] In other embodiments, the lead 212 can also be soldered onto the second welding machine part 33 in other ways, and the soldering method of the lead 212 is not limited here.

[0024] In this embodiment, six metal terminals 3 are provided on both sides of the plastic housing 1, and one or two leads 212 are welded to each metal terminal 3. In other embodiments, the number of metal terminals 3 can be set according to the actual situation.

[0025] The plastic housing 1 has several mounting slots 12 on both sides for mounting metal terminals 3. The mounting slots 12 include a first slot 121 for fixing the insertion part 31 and a second slot 122 for accommodating the second welding part 33. The first welding part 32 is located above the plastic housing 1 to facilitate welding of other products.

[0026] Both sides of the insertion part 31 are provided with a number of fixing protrusions 311 that can be inserted into the first groove 121. The method of using fixing protrusions 311 to insert can make the assembly and positioning of the metal terminal 3 and the plastic housing 1 more reliable.

[0027] The plastic housing 1 has a wire groove 13 on one side of the second cavity 122 and a wire-holding groove 14 on the other side of the second cavity 122. The wire groove 13, the second cavity 122, and the wire-holding groove 14 are interconnected, and the wire groove 13 is connected to the receiving groove 11, so that the lead wire 212 can pass through the wire groove 13 and the second cavity 122 in sequence, and finally be held in the wire-holding groove 14. After the metal terminal 3 is installed on the plastic housing 1, the second welding part 33 is horizontally positioned in the second cavity 122. Then the lead wire 212 passes through the wire groove 13 and the second cavity 122 in sequence, and finally is held in the wire-holding groove 14. At this time, the lead wire 212 is located directly above the second welding part 33, and the lead wire 212 can be welded to the second welding part 33 to realize the electrical connection between the lead wire 212 and the metal terminal 3. After the lead wire 212 passes through the wire groove and the second groove in sequence, it is inserted into the wire clamping groove, positioned, and then welded to ensure that the lead wire 212 is accurately positioned above the second welding part 22, which facilitates automated welding, reduces manual intervention, and improves welding consistency and reliability.

[0028] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A BMS vehicle-mounted transformer, characterized in that: It includes a plastic housing, a magnetic component assembly housed inside the plastic housing, and several metal terminals inserted into both sides of the plastic housing. The plastic housing is provided with a receiving groove, and at least one set of magnetic component assemblies is provided, all of which are housed in the receiving groove. The magnetic component assembly includes a first magnetic ring that has the function of isolating high voltage and a second magnetic ring that has the function of reducing noise. Both the first magnetic ring and the second magnetic ring include a magnetic ring body and several leads extending from the magnetic ring body. The leads are soldered to the metal terminals to achieve electrical connection between the two.

2. The BMS vehicle-mounted transformer as described in claim 1, characterized in that: The metal terminal includes an insert portion whose lower end is inserted into a plastic housing, a first welding portion formed by bending horizontally upwards to the left or right from the insert portion, and a second welding portion disposed between the insert portion and the first welding portion and extending horizontally forward or backward.

3. A BMS vehicle-mounted transformer as described in claim 2, characterized in that: The first welded part is located above the plastic shell.

4. A BMS vehicle-mounted transformer as described in claim 2, characterized in that: The plastic housing has several mounting slots on both sides for mounting the metal terminals.

5. A BMS vehicle-mounted transformer as described in claim 4, characterized in that: The mounting groove includes a first slot for fixing the insert portion and a second slot for accommodating the second welding portion.

6. A BMS vehicle-mounted transformer as described in claim 5, characterized in that: Both sides of the insertion part are provided with several fixing protrusions that can be inserted into the first slot.

7. A BMS vehicle-mounted transformer as described in claim 5, characterized in that: The plastic housing has a wire groove on one side of the second cavity and a wire-holding groove on the other side of the second cavity. The wire groove, the second cavity, and the wire-holding groove are interconnected, and the wire groove is connected to the receiving groove.

8. A BMS vehicle-mounted transformer as described in claim 1, characterized in that: The magnetic ring body is fixed in the receiving groove by dispensing adhesive.

9. A BMS vehicle-mounted transformer as described in claim 2, characterized in that: The lead wire is welded to the second welding part by laser welding.

10. A BMS vehicle-mounted transformer as described in claim 1, characterized in that: The magnetic component group is provided in two sets.

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