Zero wire harness integrated battery management electrical architecture

Abstract

The utility model relates to a zero wire harness integrated battery management electrical architecture, comprising a positive loop, a negative loop and a BMS module, the positive loop is provided with a main positive relay, the main positive relay is connected in parallel with a pre-charging module, and the negative loop is provided with a main negative relay and a current sensor; the BMS module controls on and off of the main positive relay and the main negative relay through a plurality of control loops, and the BMS module collects electric signals of the main positive relay, the main negative relay and the current sensor through a plurality of signal collection loops. According to the zero wire harness integrated battery management electrical framework, part of components are integrated on the PCBA board, most of circuits such as the positive pole loop, the pre-charging module, the control loop and the signal acquisition loop are integrated on the PCBA board, a wire harness structure is not needed, the product structure is greatly simplified, finally, the BMS module is integrated in the BDU shell, and the BDU shell is more compact in structure and more compact in structure. And after integration, the automation degree is increased, and cost reduction and efficiency improvement are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, and in particular to a zero-wire harness integrated battery management electrical architecture. Background Art

[0002] BDU (Battery Disconnect Unit) is a type of power distribution box designed for the inside of a battery pack. According to the location of the BDU in the battery pack, it can be divided into an in-battery box installation type and an out-of-box installation type.

[0003] BMS (Battery Management System) is used to cooperate with the device that monitors the status of energy storage batteries, intelligently manage and maintain each battery unit to prevent overcharging and over-discharging of the battery, extend the battery life, and monitor the battery status. The traditional BMS system consists of components such as battery packs, wiring harnesses, structural parts, and BMS protection boards.

[0004] Traditionally, BDU and BMS are arranged separately, which occupies a relatively large space inside the battery system. The industry adopts the traditional wiring harness connection method, which makes the entire product messy and unsightly, inefficient, and the wiring terminals are prone to loosening, wire connections are not connected properly, and wire ends fall off, leading to circuit failures and even vehicle fires. In addition, the placement of parts requires multiple installations, which is inefficient, and the production and assembly process is complicated, resulting in high costs. Utility Model Content

[0005] The embodiment of the utility model provides a zero-wire harness integrated battery management electrical architecture to solve the problem in the prior art that the product structure is complicated due to the separate arrangement of the BDU and the BMS.

[0006] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0007] A zero-wire integrated battery management electrical architecture includes a positive circuit, a negative circuit and a BMS module, wherein the positive circuit is provided with a main positive relay, the main positive relay is connected in parallel with a pre-charging module, and the negative circuit is provided with a main negative relay and a current sensor; the BMS module controls the opening and closing of the main positive relay, the main negative relay and the pre-charging module respectively through multiple control circuits, and the BMS module collects electrical signals of the main positive relay, the main negative relay, the pre-charging module and the current sensor respectively through multiple signal acquisition circuits.

[0008] Furthermore, the pre-charging module includes a pre-charging relay and a pre-charging resistor, and the pre-charging relay is connected in series with the pre-charging resistor.

[0009] Furthermore, the positive circuit is connected in parallel with a fast charging relay.

[0010] Furthermore, the positive circuit is connected in parallel with a heating positive circuit, a heating relay and a heating fuse are provided on the heating positive circuit, and the heating relay is connected in series with the heating fuse; the negative circuit is connected in parallel with a heating negative circuit.

[0011] Furthermore, it includes a shell, a PCBA board and a BMS bracket, the PCBA board is fixed at the bottom or inside of the shell; the PCBA board integrates a positive circuit, a pre-charging module, a control circuit and a signal acquisition circuit; the shell is provided with a through hole for the protruding structure on the PCBA board to pass through; if there is no relative distance between the electrical contacts of the electrical components on the shell and the corresponding electrical contacts on the PCBA board, the shell is provided with a receiving groove for inserting the electrical components; if there is a relative distance between the electrical contacts of the electrical components on the shell and the corresponding electrical contacts on the PCBA board, the shell is provided with a mounting position for installing the electrical components, and a copper busbar connecting the mounting position and the corresponding electrical contacts on the PCBA is provided in the shell; the BMS module is fixed to the shell through the BMS, and the BMS module is electrically connected to the PCBA.

[0012] Furthermore, the accommodating groove is provided with a partition surrounding the electrical component.

[0013] Furthermore, a connecting rod corresponding to the positive and negative electrical contacts of the electrical component is provided on the mounting position, the outer end of the connecting rod is a threaded end, and the threaded end is compressed and connected to the electrical contacts of the electrical component through a nut, and a copper busbar conductive to the connecting rod is provided in the shell, and the copper busbar is connected to the corresponding electrical contacts on the PCBA board.

[0014] Furthermore, the BMS module and the PCBA are directly connected via a plug-in.

[0015] The utility model embodiment has the following advantages:

[0016] The utility model adopts a zero-wiring harness integrated battery management electrical architecture that eliminates the wiring harness structure used in the traditional electrical architecture, integrates some components on the PCBA board, and fixes the components with larger size and weight through the shell, and connects the electrical contacts of the electrical components with the electrical contacts on the PCBA board as much as possible. These electrical components are equivalent to being integrated on the PCBA board. Moreover, the manufacturing process technology of the PCBA board is mature and has high stability, which can fully meet the various requirements of current, voltage resistance, and insulation design in current products. The control circuit, high-voltage acquisition circuit, pre-charging circuit, heating circuit and other lower current lines are integrated on the PCBA board, without the need for a wiring harness structure, which greatly simplifies the product structure, and finally realizes the integration of the BMS module in the BDU shell. After integration, the degree of automation is increased, and the production efficiency is high, thereby reducing the cost of the product and achieving the effect of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0019] Figure 1 A circuit diagram of a zero-wire harness integrated battery management electrical architecture provided by an embodiment of the utility model, in which the dot-dashed line is a low-voltage control loop of the BMS module;

[0020] Figure 2 An exploded view of a zero-wiring-harness integrated battery management electrical architecture provided by an embodiment of the utility model;

[0021] Figure 3 An assembly diagram of a housing, a BMS module and various electrical components in a zero-wire integrated battery management electrical architecture provided by an embodiment of the utility model;

[0022] Figure 4 This is a structural diagram of a shell in a zero-wire harness integrated battery management electrical architecture provided in an embodiment of the utility model.

[0023] In the figure:

[0024] 1. Shell; 2. Positive circuit; 3. Negative circuit; 4. BMS module; 5. Main positive relay; 6. Pre-charge relay; 7. Pre-charge resistor; 8. Fast charge relay; 9. Heating positive circuit; 10. Heating relay; 11. Heating fuse; 12. Main negative relay; 13. Current sensor; 14. Heating negative circuit; 15. PCBA board; 16. BMS bracket; 17. Accommodating groove; 18. Installation position; 19. Connecting rod; 20. Upper cover. DETAILED DESCRIPTION

[0025] The following is a specific embodiment of the present invention. People familiar with the technology can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. Obviously, the described embodiment is a part of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Figure 1 It is a circuit diagram of a zero-wire integrated battery management electrical architecture, which includes, from top to bottom, a positive circuit 2, a negative circuit 3 and a BMS module 4. K1 on the positive circuit 2 is a main positive relay 5, and the main positive relay 5 is connected in parallel to a pre-charging module. K2 in the pre-charging module is a pre-charging relay 6, and the pre-charging relay 6 is connected in series to a pre-charging resistor 7 and then in parallel to the main positive relay 5.

[0027] The positive pole loop 2 is connected in parallel with the fast charging loop, and K3 in the fast charging loop is a fast charging relay 8, so as to realize the parallel connection of the positive pole loop 2 and the fast charging loop.

[0028] The positive circuit 2 is connected in parallel to the heating positive circuit 9. In the heating positive circuit 9, K4 is a heating relay 10, and FUSE is a heating fuse 11. The heating relay 10 is connected in series with the heating fuse 11 and then connected in parallel to the main positive relay 5.

[0029] K5 in the negative electrode circuit 3 is a main negative relay 12, and the main negative relay 12 is connected in series with a current sensor 13, wherein the current sensor 13 is arranged between the main negative relay 12 and the negative electrode of the battery. If a heating circuit is provided, the negative electrode output side of the negative electrode circuit 3 is connected in parallel with a heating negative electrode circuit 14.

[0030] The BMS module 4 controls the opening and closing of the main positive relay 5, the main negative relay 12 and the pre-charging module through multiple control loops, wherein the BMS module 4 controls the relay through the low-voltage loop. For the pre-charging module, the BMS module 4 controls the opening and closing of the pre-charging relay 6. If a fast-charging loop is provided, the BMS module 4 controls the opening and closing of the fast-charging relay 8 through the low-voltage drop. If a heating loop is provided, the BMS module 4 controls the opening and closing of the heating relay 10 through the low-voltage drop.

[0031] The BMS module 4 collects electrical signals from the main positive relay 5, the main negative relay 12, the pre-charging module and the current sensor 13 through multiple signal collection circuits. The BMS module 4 needs to set collection points at both ends of each relay. Since the positive circuit 2, the pre-charging circuit, the fast charging circuit and the positive heating circuit are all connected in parallel, a collection point is set after these four circuits are connected in parallel, and a collection point is set on the other side of the relay in each circuit. In this way, the battery side collection points of the four circuits can be merged, greatly simplifying the circuit structure.

[0032] In order to simplify the product structure, this technology integrates the battery management system (BMS) and the neutral harness high-voltage distribution box (BDU), such as Figure 2 As shown, the BMS module 4 is integrated into the BDU housing 1, the electrical components in the BDU are integrated onto the PCBA board 15, and then the housing 1 is used to position each electrical component so that the electrical contacts between the electrical components and the PCBA are at the minimum distance. If there is a relative displacement between the two electrical contacts, the copper bus in the housing 1 is used to achieve connection, and finally the technical solution of zero-wire harness integration of BMS and BDU is realized. The solution specifically includes a housing 1, a PCBA board 15 and a BMS bracket 16. The PCBA board 15 is fixed at the bottom or inside of the housing 1, so that the housing 1 can cover the PCBA board 15 to play a role in protection, heat insulation and electrical insulation.

[0033] The PCBA board 15 integrates the positive circuit 2, the pre-charging module, the control circuit and the signal acquisition circuit. Figure 2 As shown, in this embodiment, the pre-charging relay 6, the prediction resistor, and the heating relay 10 are arranged on the PCBA board 15. Since the shell 1 covers the upper part of the PCBA board 15, a through hole for the pre-charging relay 6, the prediction resistor, and the heating relay 10 to pass through needs to be provided on the shell 1. Moreover, since the pre-charging module is connected in parallel with the heating positive electrode circuit 9, and the current required by the pre-charging relay 6 and the heating relay 10 is relatively low, such as 10A, the pre-charging relay 6, the prediction resistor, and the heating relay 10 are all arranged together, preferably in the central area of ​​the PCBA board 15, so that the main positive relay 5 (250A) and the fast charging relay 8 (150A) requiring large current can be separately arranged on both sides to ensure that the electrical spacing standards are met between each electrical component.

[0034] In the present technology, the electrical contacts of each electrical component are directly connected to the corresponding electrical contacts on the PCBA board 15 as much as possible. Since the size and shape of electrical components are different, and the electrical spacing must be met, if all electrical components achieve a one-to-one correspondence between the electrical contacts on the PCBA board 15, the area of ​​the PCBA board 15 will be too large, which will cause the product volume to be too large, which is contrary to the starting point of the present technology. Therefore, the electrical contacts of core electrical components such as relays are made to correspond to the electrical contacts on the PCBA board 15, and auxiliary electrical components such as current sensors 13 and heating fuses 11 are connected through copper busbars.

[0035] Specifically, Figure 3-4 As shown, if there is no relative distance between the electrical contacts of the electrical components on the housing 1 and the corresponding electrical contacts on the PCBA board 15, the housing 1 is provided with a receiving groove 17 for inserting the electrical components, and the receiving groove 17 corresponds to the electrical contacts of the electrical components on the PCBA board 15, as shown in FIG. Figure 2 , 3 As shown, the housing 1 is provided with three receiving grooves 17 for receiving the main positive relay 5, the main negative relay 12, and the fast charging relay 8 respectively. According to the distance relationship between the circuits and the current required by the electrical components, the main positive relay 5 and the main negative relay 12 are respectively arranged on both sides of the PCBA board 15, and the fast charging relay 8 is arranged on one side of the main positive relay 5. Specifically, the receiving groove 17 is provided with a partition surrounding the electrical component, and a buckle structure is provided on the top of the partition for buckling the electrical component. The material of the partition is a heat-conductive material, which is used to protect the electrical component and can also export heat.

[0036] If there is a relative distance between the electrical contacts of the electrical component on the housing 1 and the corresponding electrical contacts on the PCBA board 15, a mounting position 18 for mounting the electrical component is provided on the housing 1, and a copper bar connecting the mounting position 18 and the corresponding electrical contacts on the PCBA is provided in the housing 1. Specifically, a connecting rod 19 corresponding to the positive and negative electrical contacts of the electrical component is provided on the mounting position 18, the outer end of the connecting rod 19 is a threaded end, the electrical contacts of the electrical component are linear structures or sheet structures sleeved around the connecting rod 19, the threaded end is pressed and connected to the electrical contacts of the electrical component by a nut, and a copper bar connected to the connecting rod 19 is provided in the housing 1, and the copper bar is connected to the corresponding electrical contacts on the PCBA board 15.

[0037] The BMS module 4 is fixed to the housing 1 through a BMS bracket 16. The BMS module 4 is directly connected to the PCBA by a plug-in, without the need for extra wires and copper bars, forming a standard structure with the lowest manufacturing and construction costs. Since the BMS module 4 is a plate-like structure, and each electrical component on the PCBA board 15 in this technology has a certain height, the BMS module 4 is arranged perpendicular to the PCBA board 15, which can minimize the product structure and maximize the space utilization of the product.

[0038] The housing 1 is provided with an upper cover 20 for enclosing the various electrical components and the BMS module 4 for protection.

[0039] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A zero-wire integrated battery management electrical architecture, characterized by: It includes a positive circuit, a negative circuit and a BMS module. The positive circuit is provided with a main positive relay, the main positive relay is connected in parallel with the pre-charging module, and the negative circuit is provided with a main negative relay and a current sensor; The BMS module controls the opening and closing of the main positive relay, the main negative relay and the pre-charging module through multiple control loops, and collects electrical signals of the main positive relay, the main negative relay, the pre-charging module and the current sensor through multiple signal acquisition loops.

2. The zero harness integrated battery management electrical architecture according to claim 1, characterized in that: The pre-charging module comprises a pre-charging relay and a pre-charging resistor, and the pre-charging relay is connected in series with the pre-charging resistor.

3. The zero harness integrated battery management electrical architecture according to claim 1, characterized in that: The positive pole loop is connected in parallel with the fast charging relay.

4. The zero harness integrated battery management electrical architecture according to claim 1, characterized in that: The positive electrode circuit is connected in parallel with a heating positive electrode circuit, a heating relay and a heating fuse are provided on the heating positive electrode circuit, and the heating relay is connected in series with the heating fuse; The negative electrode loop is connected in parallel with a heating negative electrode loop.

5. A zero-wire integrated battery management electrical architecture according to any one of claims 1 to 4, characterized in that: It includes a housing, a PCBA board and a BMS bracket, wherein the PCBA board is fixed at the bottom or inside of the housing; The PCBA board integrates a positive electrode circuit, a pre-charging module, a control circuit and a signal acquisition circuit; The housing is provided with a through hole for the raised structure on the PCBA board to pass through; If there is no relative distance between the electrical contacts of the electrical component on the housing and the corresponding electrical contacts on the PCBA board, a receiving groove for inserting the electrical component is provided on the housing; If there is a relative distance between the electrical contacts of the electrical component on the housing and the corresponding electrical contacts on the PCBA, a mounting position for mounting the electrical component is provided on the housing, and a copper busbar connecting the mounting position and the corresponding electrical contacts on the PCBA is provided in the housing; The BMS module is fixed on the housing through the BMS, and the BMS module is electrically connected to the PCBA.

6. The zero harness integrated battery management electrical architecture according to claim 5, characterized in that: The accommodating groove is provided with a partition which surrounds the electrical component.

7. The zero harness integrated battery management electrical architecture according to claim 5, characterized in that: The mounting position is provided with a connecting rod corresponding to the positive and negative electrical contacts of the electrical component respectively, the outer end of the connecting rod is a threaded end, and the threaded end is compressed and connected to the electrical contact of the electrical component through a nut, and a copper busbar conductive with the connecting rod is provided in the shell, and the copper busbar is connected to the corresponding electrical contacts on the PCBA board.

8. The zero harness integrated battery management electrical architecture according to claim 1, characterized in that: The BMS module and the PCBA are directly connected using a plug-in.

Images