Filtering transformer for use in a battery management system for an automobile

Abstract

The utility model relates to the field of filter transformer, concretely relates to the filter transformer for the automobile electronic battery management system. Include: base, annular core, set up on the base and annular base with the base between be used for for fixing annular core's solid glue, and annular core's axis is perpendicular to base plane, coil winding, have three, every coil winding is wound on annular core and its positive and negative pole all downward in proper order pass through solid glue and base, isolation frame, set up in annular core middle part, this isolation frame has three for blocking adjacent two coil windings'separation board. Through the isolation frame in annular core through the physical blocking mode plays the electrical isolation function, effectively blocks the magnetic field interference between multiple windings. The structure solves the signal distortion problem caused by magnetic interference in the automobile BMS of traditional annular transformer, and simplifies the EMI filter circuit design.

Description

Technical Field

[0001] This utility model relates to the field of filter transformers, specifically to filter transformers used in automotive electronic battery management systems. Background Technology

[0002] The toroidal transformer, a key component of the automotive battery management system (BMS), is used to achieve high and low voltage isolation, noise filtering, and signal transmission. In existing technologies, such as the patent CN213601744U, a toroidal transformer is disclosed, which employs a composite structure of a toroidal magnetic core, copper sheets, and winding wires, and a six-pin uniformly distributed design, achieving some progress in miniaturization and integration. However, this toroidal transformer lacks physical separation between its multiple windings, resulting in a magnetic field coupling coefficient as high as 0.8–0.9 and inductance fluctuations exceeding ±10%, affecting the BMS's accuracy in detecting battery voltage (error > 5mV). Utility Model Content

[0003] To address the aforementioned issues, a filter transformer for automotive electronic battery management systems is provided. This transformer reduces the winding coupling coefficient through an isolation frame, thereby improving filtering accuracy and stability.

[0004] To address the problems of existing technologies, this utility model provides a filter transformer for automotive electronic battery management systems, comprising: a base; a toroidal iron core disposed on the base, with solid adhesive between the toroidal base and the base for fixing the toroidal iron core, and the axis of the toroidal iron core being perpendicular to the plane of the base; three coil windings, each coil winding being wound around the toroidal iron core with its positive and negative terminals passing downwards through the solid adhesive and the base; and an isolation frame disposed in the middle of the toroidal iron core, the isolation frame having three partitions for separating two adjacent coil windings.

[0005] Preferably, the top of the partition is higher than the upper end face of the annular iron core and has a connecting portion extending radially along the annular iron core, the connecting portion being connected to the upper end face of the annular iron core by solid glue.

[0006] Preferably, the isolation frame is a one-piece molded structure made of polyethylene terephthalate.

[0007] Preferably, the included angle between two adjacent partitions is 120 degrees.

[0008] Preferably, the maximum diameter of the filter transformer is 56mm.

[0009] Preferably, the maximum height of the filter transformer is 25mm.

[0010] Preferably, the nominal inductance of the filter transformer is 870 μH MIN.

[0011] Preferably, the maximum DC resistance of the filter transformer is 2.8mΩ.

[0012] Preferably, the operating temperature range of the filter transformer is -40℃ to 155℃.

[0013] The advantages of this invention compared to existing technologies are: electrical isolation is achieved through physical barrier within the toroidal core using an isolation frame. This structure solves the signal distortion problem caused by magnetic interference in traditional toroidal transformers in automotive BMS, and simplifies the design of EMI filter circuits. Attached Figure Description

[0014] Figure 1 This is a perspective view of the filter transformer of this utility model applied to the automotive electronic battery management system.

[0015] Figure 2 This is a top view of the filter transformer of this utility model applied to the automotive electronic battery management system.

[0016] Figure 3 This is a side view of the filter transformer of this utility model applied to an automotive electronic battery management system.

[0017] Figure 4 This is an exploded perspective view of the filter transformer of this utility model applied to the automotive electronic battery management system.

[0018] The numbers in the diagram are: 1. Base; 2. Toroidal core; 3. Coil winding; 4. Isolation frame; 41. Connecting part; 5. Solid glue. Detailed Implementation

[0019] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0020] See Figures 1-4 As shown, a filter transformer used in an automotive electronic battery management system includes: a base; a toroidal core mounted on the base with solid adhesive between the toroidal base and the base for fixing the toroidal core, and the axis of the toroidal core being perpendicular to the plane of the base; three coil windings, each coil winding wound around the toroidal core with its positive and negative terminals passing downwards through the solid adhesive and the base; and a separator frame located in the middle of the toroidal core, the separator frame having three partitions for separating two adjacent coil windings.

[0021] The top of the partition is higher than the upper end face of the annular iron core and is provided with a connecting part that extends radially along the annular iron core. The connecting part is connected to the upper end face of the annular iron core by solid glue.

[0022] The isolation frame is a one-piece molded structure made of polyethylene terephthalate, which provides electrical isolation through physical barrier. The included angle between two adjacent partitions is 120 degrees.

[0023] The maximum diameter of this filter transformer is 56mm. The maximum height of this filter transformer is 25mm.

[0024] Electrical performance of the filter transformer of this invention:

[0025] Inductance (L): The nominal inductance is 870μH MIN, and the reference value is 1.22mH.

[0026] DC resistance (DCR): The maximum DC resistance is 2.8mΩ, and the reference value is 2.5mΩ.

[0027] Rated current (R Current MAX): Simultaneously satisfying both the saturation current value and the temperature rise current, the rated current is ultimately the smaller of the two.

[0028] Turns: 8 turns per winding, 3 windings in total.

[0029] Withstand voltage test (HI-POT TEST): Test conditions: 2000V AC voltage (frequency: 50Hz), test time 3 seconds.

[0030] Operating temperature (Ope.Temp): The operating temperature range is -40℃ to 155℃. Under operating conditions, the product temperature (ambient temperature + temperature rise) should not exceed 155℃.

[0031] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A filter transformer used in an automotive electronic battery management system, characterized in that, include: Base A ring-shaped iron core is mounted on a base, and solid glue for fixing the ring-shaped iron core is provided between the ring-shaped base and the base. The axis of the ring-shaped iron core is perpendicular to the plane of the base. The coil winding has three coil windings, each coil winding is wound on a toroidal iron core and its positive and negative poles pass downwards through solid glue and the base in sequence; An isolation frame, located in the middle of the toroidal core, has three partitions for separating two adjacent coil windings.

2. The filter transformer for an automotive electronic battery management system according to claim 1, characterized in that, The top of the partition is higher than the upper end face of the annular iron core and is provided with a connecting part that extends radially along the annular iron core. The connecting part is connected to the upper end face of the annular iron core by solid glue.

3. The filter transformer for an automotive electronic battery management system according to claim 1, characterized in that, The isolation frame is a one-piece molded structure made of polyethylene terephthalate.

4. The filter transformer for an automotive electronic battery management system according to claim 3, characterized in that, The angle between two adjacent partitions is 120 degrees.

5. The filter transformer for an automotive electronic battery management system according to claim 1, characterized in that, The maximum diameter of this filter transformer is 56mm.

6. The filter transformer for an automotive electronic battery management system according to claim 1, characterized in that, The maximum height of this filter transformer is 25mm.

7. The filter transformer for an automotive electronic battery management system according to claim 1, characterized in that, The nominal inductance of this filter transformer is 870μH MIN.

8. The filter transformer for an automotive electronic battery management system according to claim 1, characterized in that, The maximum DC resistance of this filter transformer is 2.8mΩ.

9. The filter transformer for an automotive electronic battery management system according to claim 1, characterized in that, The operating temperature range of this filter transformer is -40℃ to 155℃.

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