CN116454557A - Modularized BDU structure - Google Patents

Abstract

The invention discloses a modularized BDU structure which comprises an anode module and a cathode module, wherein an anode module mounting seat is arranged on the anode module, an anode module protecting cover is arranged on an upper end cover of the anode module mounting seat, a cathode module mounting seat is arranged on the cathode module, and a cathode module protecting cover is arranged on an upper cover of the cathode module mounting seat. The modularized BDU structure enables the BDU to be split according to the functional modules, different projects and different schematic diagrams only need to be matched with different modules, reusability is improved, the volume of a single BDU unit is reduced, the fragmentation space is utilized, and cost is saved. According to the modularized BDU structure, the BDU position is flexibly adjusted according to the positive and negative electrode positions of the battery, so that the BDU is arranged on the shortest path from the positive electrode and the negative electrode of the battery to the PACK plug-in, the high-voltage connection length of the battery is shortened, the safety and the stability of a PACK system are improved, and the high-voltage connection material cost is saved.

Description

A Modular BDU Structure

technical field

The invention relates to the technical field of power batteries, in particular to a modular BDU structure.

Background technique

The power battery system of a new energy vehicle is one of the most critical parts of the vehicle and one of the components with the highest safety requirements. With the continuous increase in energy density requirements of new energy vehicle batteries, the battery pack assembly (hereinafter referred to as PACK) occupies an increasing proportion of the internal battery space, and the installation space of its battery disconnect unit (hereinafter referred to as BDU) is becoming more and more cramped. , and presents a trend of fragmentation.

In the current power battery system of new energy vehicles, the battery CTP technology is the development direction of PACK battery integration. Compared with the CTM mode, it has the advantages of high space utilization, high production efficiency, and high energy density, but the longer distance between the positive and negative electrodes causes the battery The high-voltage connection (busbar or cable) to the BDU is too long, which has a negative impact on the safety, stability, and cost of the PACK system, and the shape and boundary of the PACK of different models affect the internal battery arrangement, and the reserved BDU installation space is not enough Similarly, developing new BDU products for each new project will greatly increase R&D costs.

Contents of the invention

The purpose of the present invention is to provide a modular BDU structure to solve the problem of the power battery system of new energy vehicles on the market proposed by the above-mentioned background technology. The safety, stability, and cost of the system all have negative impacts. At the same time, the installation space of BDUs is not the same, which causes the problem of increased R&D costs of BDUs.

In order to achieve the above object, the present invention provides the following technical solutions: a modular BDU structure, including a positive module and a negative module, the positive module is provided with a positive module mounting seat, and the positive module mounting seat is provided with a positive module protection on the end cover cover, the negative module is provided with a negative module mounting seat, and the negative module mounting seat is provided with a negative module protective cover.

Preferably, the positive electrode module is designed in a slender shape.

Preferably, a pre-charging resistor, a pre-charging relay, a main fuse and a main positive relay are installed in the mounting seat of the positive module, and the pre-charging resistor and the main fuse are installed in layers in the middle, and the pre-charging relay and the main positive relay are respectively located at sides.

Preferably, a positive input terminal block and a positive output terminal block are respectively installed on both sides of the positive pole module mounting base, and the positive pole output terminal base is provided with double connection points, and one of the connection points of the positive pole output terminal base is connected to the main circuit plug-in copper The other connection point is connected to the wire of the range extender plug-in.

Preferably, first mounting holes are evenly opened on the positive module mounting seat, and the first mounting holes are distributed in a triangle, and second mounting holes are evenly opened on the negative electrode module mounting seat, and the second mounting holes are also Triangular distribution.

Preferably, a current sensor and a main negative relay constituting the main negative circuit are installed in the negative module mounting base, and a negative input terminal block and a negative output terminal base are respectively installed on both sides of the negative electrode module mounting base.

Preferably, the negative output terminal block is also provided with double connection points, and one of the connection points of the negative output terminal block is connected to the copper bar of the range-extending plug-in, and the other connection point is connected to the wire of the main circuit plug-in.

Preferably, the protective cover of the positive module and the protective cover of the negative module are respectively provided with a first terminal block protective case and a second terminal block protective case integrally formed, and the first terminal block protective case is arranged on the positive input terminal block, The positive output terminal block, and the second terminal block protective shell is arranged on the negative input terminal block and the negative output terminal block.

Compared with the existing integrated BDU technology, the beneficial effect of the present invention is: the modular BDU structure allows the BDU to be split according to functional modules, and different projects and different schematic diagrams only need to select different modules, which improves the reusability and reduces the size of the BDU. The volume of a single BDU unit makes use of the debris space and saves costs. The modular BDU structure flexibly adjusts the position of the BDU according to the positions of the positive and negative poles of the battery, so that it is set on the shortest path from the positive and negative poles of the battery to the PACK plug-in, thereby shortening the length of the high-voltage connection of the battery and improving the safety and stability of the PACK system. Save the cost of high-voltage connection materials.

Description of drawings

Fig. 1 is a schematic diagram of the connection structure between a modular BDU structure main body and a battery pack assembly in the present invention;

Fig. 2 is a schematic diagram of the top view structure inside the positive module of a modular BDU structure of the present invention;

Fig. 3 is a top view of the positive module of a modular BDU structure of the present invention;

4 is a schematic diagram of the internal three-dimensional structure of the positive module of a modular BDU structure of the present invention;

5 is a perspective view of a positive module of a modular BDU structure of the present invention;

Fig. 6 is a schematic diagram of the internal top view structure of the negative electrode module of a modular BDU structure of the present invention;

Fig. 7 is a top view of a negative electrode module of a modular BDU structure of the present invention;

8 is a schematic diagram of the internal three-dimensional structure of the negative module of a modular BDU structure of the present invention;

FIG. 9 is a perspective view of a negative electrode module of a modular BDU structure according to the present invention.

In the figure: 1. The main positive pole of the battery; 2. The main negative pole of the battery; 3. The main circuit plug-in; 4. The positive module; 41. The pre-charging resistor; , the first installation hole; 461, the positive input wiring seat; 462, the positive output wiring seat; 47, the positive module mounting seat; 48, the first wiring seat protective shell; 49, the positive module protective cover; 5, the battery pack assembly; 6. Negative pole module; 61. Negative pole module mounting seat; 62. Second installation hole; 631. Negative pole input wiring seat; 632. Negative pole output wiring seat; 64. Main negative relay; 65. Current sensor; 66. Negative pole module protective cover ; 67. The protective shell of the second terminal block; 7. The range-extending plug-in.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments of the battery pack assembly are only part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1-9, in the first embodiment of the present invention, the present invention provides a kind of technical scheme: comprise anode module 4 and anode module 6, anode module 4 is elongated design, this structure anode module 4 passes elongate shape design, can utilize the debris space, strong installation flexibility, and strong reusability, the positive module 4 is provided with a positive module mounting seat 47, and the positive electrode module mounting seat 47 is installed with a pre-charging resistor 41, a pre-charging relay 42, and a main fuse 43 And the main positive relay 44, and the pre-charging resistance 41 and the main positive relay 43 are installed in layers in the middle, and the pre-charging relay 42 and the main positive relay 44 are respectively on both sides. circuit, the pre-charging resistor 41 and the pre-charging relay 42 form a pre-charging circuit, through the staggered installation of the pre-charging resistor 41 and the main fuse 43, the positive module 4 can be installed by making full use of the height under the condition of minimizing the width, so as to reduce the Due to the volume of the small positive module 4, positive input terminal blocks 461 and positive output terminal blocks 462 are respectively installed on both sides of the positive electrode module mounting base 47, and the positive output terminal blocks 462 are provided with double connection points, and one of the positive output terminal blocks 462 One connection point is connected to the copper bar of the main circuit plug-in 3, and the other connection point is connected to the wire of the range-extending plug-in 7. In this structure, the positive input terminal block 461 and the positive output terminal block 462 are used for the input and output wiring processing of the positive electrode module 4, and the positive electrode The input terminal block 461 and the positive output terminal block 462 can support connections from three directions, and are effectively compatible with various installation situations. The positive output terminal block 462 can be compatible with the two circuit plug-ins of the battery pack of the extended-range vehicle by setting double connection points. Requirements, the first mounting holes 45 are evenly opened on the positive module mounting base 47, and the first mounting holes 45 are distributed in a triangle. In this structure, the positive electrode module mounting base 47 can be fixed with the battery pack through the first mounting holes 45, which can realize The stable positioning of the positive module 4, and the upper end cover of the positive module mounting seat 47 is provided with a positive module protective cover 49, and the positive module protective cover 49 and the negative module protective cover 66 are respectively provided with an integrated first terminal block protective shell 48 and a second terminal block. Two terminal block protective shells 67, and the first terminal block protective shell 48 covers the positive input terminal block 461 and the positive output terminal block 462, and the second terminal block protective shell 67 covers the negative input terminal block 631 and the negative output terminal block. On the terminal block 632, this structure enables the positive input terminal block 461, the positive output terminal block 462, the positive input terminal block 461, and the positive output terminal block 462 to receive wiring protection treatment. The first terminal block protective shell 48 and the second terminal block The protective case 67 can be flexibly connected with the positive module protective cover 49 and the negative module protective cover 66 respectively, so that the wiring processing on the positive terminal block 46 and the negative terminal block 63, the negative terminal module 6 is provided with a negative terminal module mounting seat 61, and the negative terminal module is installed The current sensor 65 and the main negative relay 64 forming the main negative circuit are installed in the seat 61, and the negative pole input terminal block 631 and the negative pole output terminal base 632 are respectively installed on both sides of the negative pole module mounting base 61. The negative loop formed by the negative relay 64 plays the role of current collection. The negative output terminal block 632 is also provided with double connection points, and one of the connection points of the negative output terminal block 632 is connected to the copper bar of the range extender plug-in 7, and the other connection point is connected to the The main circuit plug-in 3 wires are connected. The negative input terminal block 631 and the negative output terminal block 632 of this structure are used for the input and output wiring processing of the negative module 6. The negative input terminal block 631 and the negative output terminal block 632 can also support connections from three directions. The connection is effectively compatible with various installation situations. The output end of the negative terminal block 63 is provided with double connection points, which is compatible with the requirements of the two circuit plug-ins of the extended-range vehicle battery pack, and the upper cover of the negative module mounting seat 61 is equipped with a negative module protective cover. 66. Second mounting holes 62 are evenly opened on the negative electrode module mounting base 61, and the second mounting holes 62 are also triangularly distributed. In this structure, the negative electrode module mounting base 61 is fixed to the battery pack through the second mounting holes 62, which can realize Stable positioning of the negative module 6 .

Embodiment 2: On the basis of the previous embodiment, it also includes a battery pack assembly 5, the battery pack assembly 5 is equipped with the battery main positive pole 1 and the battery main negative pole 2, and the positive pole module 4 and the negative pole module 6 are arranged on the battery pack On the assembly 5, and the positive module 4 and the negative module 6 are close to the battery main positive pole 1 and the battery main negative pole 2 respectively, the negative pole module 6 is located in the front trapezoidal space of the battery pack assembly 5 shell, and the negative pole module 6 adopts the side length The boundary dimension design, the trapezoidal space at the front of the battery pack assembly 5 shell of this structure is usually used for the installation of the battery management system. In the power battery system of new energy vehicles, the shorter the distance from the main negative electrode 2 of the battery to the current sensor 65, The smaller the impact on the accuracy of current collection, the negative module 6 is arranged in the trapezoidal space at the front of the battery pack assembly 5 housing, realizing a space arrangement with short communication distances from the current sensor 65 to the BMS and short distances to the battery and the main negative electrode 2 of the battery. Cloth, killing two birds with one stone, the negative electrode module 6 adopts the border size design with similar side lengths to obtain a larger usable area with a smaller aspect ratio, and utilizes the triangular areas on both sides of the trapezoidal space at the front of the battery pack assembly 5 housing.

When using the modular BDU structure, firstly the positive module 4 is installed with the pre-charging resistor 41, the pre-charging relay 42, the main fuse 43 and the main positive relay 44 through the positive module mounting base 47, and the positive module protective cover 49 is set on the positive pole. The internal main positive circuit and the pre-charging circuit are protected on the module mounting base 47, the negative module 6 is installed with the current sensor 65 and the main negative relay 64 through the negative module mounting base 61, and the negative module protective cover 66 is set on the negative module mounting base 61 for the protection of the internal main and negative circuits. When installing the positive module 4 and the negative module 6, the positive module 4 with a slender design is fixed on the reinforcing beam between the battery pack assembly 5 shell and the battery, and Fix the casing of the battery pack assembly 5 and the mounting seat 47 of the positive electrode module through bolts at the first mounting hole 45, and then fix the negative electrode module 6 designed with a similar side length to the front of the casing of the battery pack assembly 5 One side of the trapezoidal space, and the battery pack assembly 5 housing and the positive module mounting seat 47 are fixed by bolts at the second mounting hole 62, and then the positive input wiring for input and output wiring on the positive module 4 is passed. The seat 461 and the positive output terminal block 462 are connected to the positive module 4 with the main positive electrode 1 of the battery and the main circuit plug-in 3, and then through the negative input terminal block 631 and the negative output terminal block 632 on the negative module 6 for input and output wiring to the negative electrode The module 6 is connected with the main negative electrode 2 of the battery, the range extender plug-in 7 and the BMS, and then the first terminal block protective shell 48 and the second terminal block protective shell 67 are covered respectively for the positive input terminal block 461, the positive output terminal block 462, and the negative terminal block. The input terminal block 631 and the negative output terminal block 632 are protected to complete a series of work.

Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or perform equivalent replacements for some of the technical features. Within the spirit and principles of the present invention, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.

Claims (8)

1. A modular BDU structure, comprising a positive module (4) and a negative module (6), characterized in that: the positive module (4) is provided with a positive module mount (47), and the positive module mount ( 47) The upper end cover is provided with a positive module protective cover (49), the negative module (6) is provided with a negative module mounting seat (61), and the upper cover of the negative module mounting seat (61) is provided with a negative module protective cover (66 ). 2. A modular BDU structure according to claim 1, characterized in that: the positive module (4) is designed in an elongated shape. 3. A modular BDU structure according to claim 1, characterized in that: a pre-charging resistor (41), a pre-charging relay (42), a main fuse (43) are installed in the positive module mounting seat (47) ) and the main positive relay (44), and the pre-charging resistance (41) and the main insurance (43) are installed in layers in the middle, and the pre-charging relay (42) and the main positive relay (44) are respectively on both sides. 4. A modular BDU structure according to claim 1, characterized in that: positive input terminal blocks (461) and positive output terminal blocks (462) are respectively installed on both sides of the positive electrode module mounting base (47) , and the positive output terminal block (462) is provided with double connection points, and one of the connection points of the positive output terminal block (462) is connected to the copper bar of the main circuit plug-in (3), and the other connection point is connected to the wire of the range-extending plug-in (7) connect. 5. A modular BDU structure according to claim 1, characterized in that: first mounting holes (45) are evenly opened on the positive module mounting seat (47), and the first mounting holes (45) It is distributed in a triangle, and second installation holes (62) are evenly opened on the negative module installation seat (61), and the second installation holes (62) are also distributed in a triangle. 6. A modular BDU structure according to claim 4, characterized in that: a current sensor (65) forming a main negative circuit and a main negative relay (64) are installed in the negative module mounting seat (61), In addition, negative pole input terminal blocks (631) and negative pole output terminal bases (632) are respectively installed on both sides of the negative pole module mounting seat (61). 7. A modular BDU structure according to claim 6, characterized in that: the negative output terminal block (632) is also provided with double connection points, and one of the connection points of the negative output terminal block (632) is connected to the extended range The plug-in (7) is connected to the copper bar, and the other connection point is connected to the lead of the main circuit plug-in (3). 8. A modular BDU structure according to claim 7, characterized in that: the protective cover of the positive module (49) and the protective cover of the negative module (66) are respectively provided with an integrally formed first terminal block protective shell (48) and the second terminal block protective shell (67), and the first terminal block protective shell (48) is covered on the positive input terminal block (461), the positive output terminal block (462), and the second terminal block protection The shell (67) is covered on the negative pole input terminal block (631) and the negative pole output terminal base (632).