CN216123004U

CN216123004U - Pre-charging circuit board and BDU and battery pack with same

Info

Publication number: CN216123004U
Application number: CN202122697763.4U
Authority: CN
Inventors: 徐彦博; 李宁宁; 郭成蒙
Original assignee: Beijing Key Power Technology Co ltd
Current assignee: Beijing Key Power Technology Co ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-03-22
Anticipated expiration: 2031-11-05

Abstract

The utility model discloses a pre-charging circuit board, a BDU (brain-side terminal unit) with the same and a battery pack with the same, wherein the pre-charging circuit board comprises a pre-charging resistor, and the pre-charging resistor comprises: a board body and a circuit layer; the circuit layer comprises a resistance wire arranged on the plate body, and a first bonding pad and a second bonding pad which are fixed on the plate body; two ends of the resistance wire are respectively connected with the first bonding pad and the second bonding pad so as to realize the electric connection of the first bonding pad and the second bonding pad. The pre-charging circuit board is an aluminum plate with the resistance wires arranged, the aluminum plate is large in area and good in heat dissipation performance, the specification size and arrangement of the resistance wires can be changed and adjusted according to different pre-charging resistance requirements, the design is flexible, the resistance wires are integrated on the base material through printing, the production efficiency is high, and the cost is low; in addition, because the heating loop current is small, the patch type heating fuse can be directly welded on the pre-charging circuit board, so that the pre-charging resistor and the heating fuse are highly integrated, the occupied space is small, and the cost is low.

Description

Pre-charging circuit board and BDU and battery pack with same

Technical Field

The utility model relates to the technical field of power batteries, in particular to a pre-charging circuit board, a BDU (brain-side terminal unit) with the same and a battery pack with the same.

Background

The motor controller of the new energy electric vehicle is provided with a large bus capacitor, the main relay is directly switched on under the condition of no pre-charging in cold start, the high voltage of the battery is directly loaded on the empty bus capacitor, namely instantaneous short circuit is realized, and the relay can be damaged by extremely large instantaneous current. In order to prevent the relay from being damaged, a pre-charging resistor is usually added, and a bus capacitor is pre-charged through a pre-charging resistor loop, so that a circuit when a main circuit is switched on can be controlled within a safety range, and normal operation of a system is ensured.

In the prior art, a pre-charging resistor, such as an aluminum-shell resistor, is provided with a metal aluminum shell on the outer side; or the cement resistor, the outside is ceramic, both install and take up the space greatly, the radiating effect is bad; for different resistance requirements, the pre-charging resistors with different specifications or a plurality of pre-charging resistors are used in series-parallel connection, and the use cost is high.

In addition, when ambient temperature is less than the minimum temperature of battery normal use, need heat the battery, for avoiding appearing the adhesion of heating relay, unable stop heating causes the dry combustion method battery, causes thermal safety, and heating circuit often sets up heating fuse, and heating fuse shell is ceramic or glass fibre at present, and the volume is great, and installation occupation space is big for integrated Battery Disconnect Unit (BDU) occupation space is big, and is with high costs.

Therefore, in view of the above technical problems, it is urgently required by those skilled in the art to develop a novel precharge circuit board, a BDU and a battery pack having the same.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pre-charging circuit board, a BDU and a battery pack with the same, wherein the pre-charging circuit board is used as a pre-charging resistor in a mode that a resistance wire is printed on a base material, so that the heat dissipation performance and the volume are improved, the production efficiency is high, the cost is low, and the occupied space is small so that the volume of the BDU is reduced.

In order to achieve the above purpose, the utility model provides the following technical scheme:

the pre-charging circuit board comprises a pre-charging resistor, wherein the pre-charging resistor comprises:

a plate body; and

a circuit layer;

the circuit layer comprises a resistance wire arranged on the plate body, and a first bonding pad and a second bonding pad which are fixed on the plate body;

and two ends of the resistance wire are respectively connected with the first bonding pad and the second bonding pad so as to realize the electric connection of the first bonding pad and the second bonding pad.

Further, the plate body comprises a metal substrate and an insulating layer arranged on the metal substrate;

the circuit layer is located on the insulating layer.

Further, the pre-charging circuit board also comprises a heating fuse;

the heating fuse is a patch type heating fuse;

the circuit layer further comprises a third bonding pad fixed on the board body;

and two ends of the heating fuse are respectively and electrically connected with the second bonding pad and the third bonding pad.

The utility model discloses a BDU (brain-based device) which comprises a bottom plate and a component fixed on the bottom plate, wherein the pre-charging circuit board is arranged between the bottom plate and the component.

Furthermore, the component is provided with a mounting hole, and the pre-charging circuit board is provided with an avoidance hole corresponding to the mounting hole;

the components and parts and the pre-charging circuit board are fixedly connected with the bottom plate through fasteners penetrating through the mounting holes and the avoiding holes.

Further, the bottom plate is an injection molding piece;

the bottom plate is provided with a groove matched with the pre-charging circuit board, and the pre-charging circuit board is embedded into the groove;

the bottom plate is provided with a convex part protruding towards the component, the peripheral surface of the convex part is matched with the avoidance hole, and the height of the convex part is greater than the thickness of the pre-charging circuit board;

the bottom surface of the component is fixed on the top surface of the convex part.

The utility model also discloses a battery pack which comprises a box body, wherein the BDU is arranged at the bottom of the box body.

In the technical scheme, the pre-charging circuit board, the BDU with the same and the battery pack have the following beneficial effects:

the pre-charging circuit board comprises pre-charging resistors, the pre-charging resistors are aluminum plates with resistance wires arranged, the aluminum plates are large in area and good in heat dissipation performance, the specification size and arrangement of the resistance wires can be changed and adjusted according to different pre-charging resistor requirements, the design is flexible, the resistance wires are integrated on a base material through printing, the production efficiency is high, and the cost is low; in addition, because the heating loop current is small, the patch type heating fuse can be directly welded on the pre-charging circuit board, so that the pre-charging resistor and the heating fuse are highly integrated, the occupied space is small, and the cost is low.

Utility model's pre-charge circuit board is plate body structure, and BDU has the bottom plate, and the pre-charge circuit board can be connected as an organic wholely with the BDU bottom plate, piles up the other components and parts of installation on the pre-charge circuit board, like the relay, has saved the face occupation space of bottom plate for the BDU volume reduces, and occupation space is little, reduce cost.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

Fig. 1 is a schematic structural diagram of a pre-charge circuit board according to an embodiment of the present invention;

fig. 2 is a first schematic structural diagram of a BDU with a pre-charging circuit board according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

fig. 4 is a second schematic structural diagram of a BDU with a pre-charging circuit board according to an embodiment of the present invention;

fig. 5 is a schematic circuit diagram of a pre-charge circuit board according to an embodiment of the utility model.

Description of reference numerals:

100. pre-charging the circuit board;

10. pre-charging a resistor;

11. a plate body; 111. avoiding holes;

12. a circuit layer; 121. a first pad; 122. a second pad; 123. a third pad; 124. a resistance wire;

20. heating the fuse;

200、BDU；

21. a base plate; 211. a convex portion;

22. a component; 23. a fastener;

1. a battery pack; 2. a main circuit fuse; 3. a positive relay; 4. heating the relay; 5. a heating device; 6. a charger; 7. a pre-charging relay; 8. and a negative relay.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1;

the first embodiment;

in the pre-charge circuit board 100 of the present embodiment, the pre-charge circuit board 100 includes a pre-charge resistor 10, and the pre-charge resistor 10 includes:

a plate body 11; and

a circuit layer 12;

the circuit layer 12 includes a resistance wire 124 disposed on the board body 11, and a first pad 121 and a second pad 122 fixed to the board body 11;

both ends of the resistance wire 124 are connected to the first pad 121 and the second pad 122, respectively, to achieve electrical connection of the first pad 121 and the second pad 122.

Among them, preferred are:

the plate body 11 includes a metal substrate and an insulating layer disposed on the metal substrate;

the circuit layer 12 is located on the insulating layer.

The pre-charge circuit board 100 disclosed in this embodiment includes a board body 11 and a circuit layer 12, wherein the board body 11 has the metal base and the insulating layer. And the pre-charging resistor of this embodiment one can be an aluminium base circuit board in fact, and the radiating effect that adopts this kind of mode to pass through aluminium base board plate body is good, and resistance wire 124 is printed on plate body 11 according to actual resistance requirement moreover, consequently, can guarantee that installation fixed position and plate body size are unified, and circuit board production technology is ripe at present stage moreover, simple structure, and use cost is low relatively.

Preferably, the pre-charge circuit board 100 further includes a heating fuse 20;

the heating fuse 20 is a patch type heating fuse;

the circuit layer 12 further includes a third pad 123 fixed to the board body 11;

both ends of the heating fuse 20 are electrically connected to the second pad 122 and the third pad 123, respectively.

The circuit principle of the heating fuse 20 is shown by fig. 5, one end of the main circuit fuse 2 is electrically connected with the anode of the battery pack 1, the other end of the main circuit fuse is electrically connected with one end of the anode relay 3, one end of the cathode relay 4 is electrically connected with the cathode of the battery pack 1, the pre-charging circuit comprises a pre-charging resistor 10 and a pre-charging relay 7, two ends of the charger 6 are respectively electrically connected with the other ends of the anode relay 3 and the cathode relay 4, the heating circuit is connected with two ends of the charger 6 in parallel, and the heating circuit sequentially comprises the heating relay 4, the heating device 5 and the heating fuse 20 which are connected in series. The pre-charging resistor 10 and the heating fuse 20 are both electrically connected to the other end of the negative relay 4, and the pre-charging resistor 10 and the heating fuse 20 are integrated on the pre-charging circuit board 100.

Structurally, the circuit layer 12 further includes a third pad 123, two ends of the heating fuse 20 are electrically connected to the second pad 122 and the third pad 123, and in the first embodiment, a patch-type heating fuse is used to replace a fuse in the prior art, and the patch-type heating fuse can be directly welded to the pre-charging resistor 10 without being fixed by an insulating mounting support, so that the cost is greatly reduced.

Example two:

see fig. 2-5.

The utility model discloses a BDU, which comprises a bottom plate 21 and a component 22 fixed on the bottom plate 21, wherein a pre-charging circuit board 100 is arranged between the bottom plate 21 and the component 22.

The component 22 has a mounting hole, and the pre-charge circuit board 100 has an avoidance hole 111 corresponding to the mounting hole;

the component 22 and the pre-charge circuit board 100 are fastened to the base plate 21 by fasteners passing through the mounting holes and the relief holes 111.

The second embodiment discloses a BDU having the pre-charge circuit board 100, which includes a board body 11 and a component 22, wherein the component 22 has a mounting hole, the pre-charge circuit board 100 has an avoiding hole 111 corresponding to the mounting hole, the component 22 and the pre-charge circuit board 100 are fixed on the bottom board 21 through the mounting hole, and the pre-charge circuit board 100 is located between the bottom board 21 and the component 22.

Preferably, the bottom plate 21 of the second embodiment is an injection molded part;

the bottom plate 21 is provided with a groove matched with the pre-charging circuit board 100, and the pre-charging circuit board 100 is embedded in the groove;

the bottom plate 21 is formed with a convex portion 211 protruding toward the component 22, the outer peripheral surface of the convex portion 211 is fitted with the relief hole 111, and the height of the convex portion 211 is greater than the thickness of the pre-charge circuit board 100;

the bottom surface of the component 22 is fixed to the top surface of the convex portion 211.

In the embodiment, as further explained and illustrated by taking the bottom plate 21 as an injection-molded part, the bottom plate 21 is provided with a groove for accommodating the pre-charge circuit board 100, the inner surface of the bottom of the groove is at least partially provided with a convex portion 211, the outer peripheral surface of the convex portion 211 is matched with the relief hole 111, the top surface of the convex portion 211 is higher than the thickness of the pre-charge circuit board 100, the fastener is a bolt, passes through the mounting hole of the component 22 and is connected with a threaded sleeve embedded in the convex portion 211 so as to fix the component 22 on the top surface of the convex portion 211, certainly, there may be no protrusion, the bottom of the mounting hole of the component 22 is fixed on the upper surface of the pre-charge circuit board 100, there may also be no groove, the pre-charge circuit board 100 may be adhered to the bottom plate 21 by a structural adhesive, it should be noted that the surface of the pre-charge circuit board 100 is sprayed with a moisture-proof insulating paint, the shell of the component 22 is an insulating layer, and the component 22 may be a relay or other devices on the BDU.

Certainly, the bottom plate 21 disclosed in the second embodiment may also be a sheet metal part, in fig. 4, the bottom plate 21 selects a metal plate, the metal plate is press-riveted with a screw protruding toward the component 22, the screw sequentially penetrates through the avoiding hole 111 of the pre-charging circuit board 100 and the mounting hole of the component 22 and the fastener located above the mounting hole, at this time, the fastener is a nut, and a heat-conducting adhesive is disposed between the pre-charging circuit board 100 and the metal bottom plate, so that the total volume of the BDU can be reduced by adopting the pre-charging circuit board 100 and the mounting mode, and the cost can be reduced by about 70%.

Example three:

the pre-charging circuit board 100 is the pre-charging resistor 10, the pre-charging resistor 10 is an aluminum plate with the arranged resistance wires, the aluminum plate has good large-area heat dissipation performance, the specification size and the arrangement of the resistance wires can be changed and adjusted according to different requirements of the pre-charging resistor, the design is flexible, the resistance wires 124 are integrated on a base material through printing, the production efficiency is high, and the cost is low; in addition, because the heating loop current is small, a patch type heating fuse can be directly welded on the pre-charging circuit board 100, so that the pre-charging resistor 10 and the heating fuse 20 are highly integrated, the occupied space is small, and the cost is low.

Utility model discloses a pre-charge circuit board 100 is the plate body structure, and BDU has bottom plate 21, and pre-charge circuit board 100 can be connected as an organic wholely with BDU bottom plate 21, piles up other components and parts 22 of installation on pre-charge circuit board 100, like the relay, has saved the face occupation space of bottom plate 21 for the BDU volume reduces, and occupation space is little, reduce cost.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the utility model. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the utility model.

Claims

1. Pre-filled circuit board, characterized in that, this pre-filled circuit board (100) includes pre-filled resistance, pre-filled resistance includes:

a plate body (11); and

a circuit layer (12);

the circuit layer (12) comprises a resistance wire (124) arranged on the board body (11), and a first bonding pad (121) and a second bonding pad (122) which are fixed on the board body (11);

two ends of the resistance wire (124) are respectively connected with the first bonding pad (121) and the second bonding pad (122) so as to realize the electric connection of the first bonding pad (121) and the second bonding pad (122).

2. The pre-charge circuit board according to claim 1, wherein the board body includes a metal substrate, and an insulating layer disposed on the metal substrate;

the circuit layer (12) is located on the insulating layer.

3. The pre-charge circuit board according to claim 2, wherein the pre-charge circuit board (100) further comprises a heating fuse (20);

the heating fuse (20) is a patch type heating fuse;

the circuit layer (12) further comprises a third pad (123) fixed on the board body (11);

both ends of the heating fuse (20) are electrically connected to the second pad (122) and the third pad (123), respectively.

BDU comprising a backplane (21) and a component (22) fixed on said backplane (21), characterized in that between said backplane (21) and said component (22) there is a pre-charge circuit board (100) according to any of claims 1 to 3.

5. A BDU according to claim 4, wherein the component (22) is provided with a mounting hole, and the pre-charging circuit board (100) is provided with a avoiding hole (111) corresponding to the mounting hole;

the component (22) and the pre-charging circuit board (100) are fixedly connected with the bottom plate (21) through fasteners penetrating through the mounting holes and the avoiding holes (111).

6. A BDU according to claim 5, characterized in that said bottom plate (21) is an injection molded piece;

the bottom plate (21) is provided with a groove matched with the pre-charging circuit board (100), and the pre-charging circuit board (100) is embedded into the groove;

a convex part (211) protruding towards the component (22) is formed on the bottom plate (21), the outer peripheral surface of the convex part (211) is matched with the avoidance hole (111), and the height of the convex part (211) is larger than the thickness of the pre-charging circuit board (100);

the bottom surface of the component (22) is fixed to the top surface of the convex portion (211).

7. Battery pack comprising a case, characterized in that the bottom of the case is fitted with a BDU as defined in any one of claims 4 to 6.