Enhanced heat dissipation battery management and energy circuit breaking unit

Abstract

The utility model belongs to the technical field of new energy automobile power batteries, and particularly relates to an enhanced heat dissipation battery management and energy circuit breaking unit which comprises a BDU module, the BDU module comprises a shell, a main relay arranged in the shell, a BMS module and an auxiliary PCB arranged between the main relay and the BMS module, a pre-charging resistor, a pre-charging relay, a heating relay, a heating fuse and a heating output terminal are integrated on the auxiliary PCB; the main relay is inversely arranged in the shell, the main relay is connected with a connecting bar, the connecting bar is provided with a bulge towards the direction of the bottom shell, and a heat-conducting medium is filled between the bulge and the bottom shell; the BDU module provided by the utility model has high integration and excellent heat dissipation performance, and the BMS is integrated in the BDU, so that high and low voltage isolation is effectively realized; and in addition, the contact point of the main relay is connected with the connecting bar, and the connecting bar and the bulge are attached to the bottom shell through the insulating heat-conducting pad, so that heat generated by the main relay can be quickly guided into the bottom shell, and the heat can be quickly exchanged.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy vehicle power batteries, and specifically relates to an enhanced heat dissipation battery management and energy disconnection unit. Background Art

[0002] At present, new energy vehicle OEMs are making breakthroughs in the following two directions to improve vehicle range. The first is to improve the energy density of the battery itself, that is, to improve the energy density of the battery by adjusting the raw materials of the battery, the winding method of the film inside the battery, etc. That is, under the same size conditions, a single battery cell can store more electricity. The second is to make the most effective use of the internal space of the battery pack so that more batteries can be placed in the battery pack. Then the space for the corresponding power management and internal detection circuits will be compressed. At present, the space conflict inside the battery pack is becoming increasingly prominent.

[0003] According to the car companies' definition of vehicle models, different models have different charging and discharging currents, and the corresponding relay selection specifications need to meet the use specification requirements. The larger the relay, the higher the cost. Some electrical principles use 3-4 relays, which has a greater cost conflict on power management.

[0004] The energy management system inside the traditional battery pack is divided into the energy disconnect unit (BDU) and the battery management system (BMS). The BMS can closely monitor, control and distribute the reliable charging and discharging of the entire battery system during its service life. Accurate monitoring of current and voltage distribution is crucial. Each sampling point corresponds to a connector, and the control harness corresponds to multiple connectors, which is a major challenge to the stability and reliability of the product.

[0005] The use of relays in the prior art is carried out by natural heat dissipation, and natural heat dissipation relies on the hot air inside the relay to exchange heat with the air inside the battery pack through the relay housing. The thermal conductivity of the relay housing is 0.3-0.5W / mK, so its thermal conductivity efficiency is extremely low.

[0006] In order to solve the problem of low thermal conductivity of relays in the prior art, a solution is adopted in which a copper busbar (not specified) contacts the battery pack shell. However, in the above solution, the copper busbar is pre-buried inside the shell. This will cause safety risks. Because the part in contact with the relay dissipates a lot of heat, and the relay is in close contact with the shell during the process of transferring heat to the battery pack shell through the copper busbar, there is a risk of structural failure due to overheating. Utility Model Content

[0007] The purpose of the present invention is to provide a heat dissipation enhanced battery management and energy disconnection unit to solve the problems raised in the background technology.

[0008] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0009] A heat dissipation enhanced battery management and energy disconnection unit, comprising a BDU module, the BDU module comprising a housing and a main relay arranged in the housing;

[0010] The main relay is inverted in the housing, the main relay is connected with a connection row, the connection row is provided with a protrusion toward the bottom shell, and a heat-conducting medium is filled between the protrusion and the bottom shell.

[0011] As a further optimization solution of the present invention, a BMS module is provided in the BDU module.

[0012] As a further optimization solution of the utility model, an auxiliary PCB board is provided in the BDU module, and at least a pre-charging resistor, a pre-charging relay, a heating relay, a heating fuse and a heating output terminal are integrated on the auxiliary PCB board.

[0013] As a further optimization solution of the present utility model, a gap is provided between the BMS module, the auxiliary PCB board and the main relay.

[0014] As a further optimization solution of the present utility model, the auxiliary PCB board and the BMS module are connected via a centralized wiring harness.

[0015] As a further optimization solution of the utility model, the main relay includes a main positive relay, a main negative relay, a fast charging positive relay and a fast charging negative relay.

[0016] As a further optimization solution of the utility model, gaps are provided between the main relay, the pre-charging relay, the heating relay and the housing.

[0017] As a further optimization solution of the utility model, the connecting bar is a copper bar or an aluminum bar or a copper-coated aluminum bar.

[0018] As a further optimization scheme of the utility model, the heat-conducting medium is a solid material or a semi-solid material, the solid material is a thermal pad, and the semi-solid material is any one of thermally conductive gel, thermally conductive mud and thermally conductive potting glue.

[0019] The beneficial effects of the utility model are:

[0020] (1) The BDU module proposed in this application has high integration. Specifically, the BMS is integrated inside the BDU and is designed in the same housing, which effectively isolates high and low voltages and minimizes the impact of EMC problems. The original two sets of housings are simplified to one set. The production cost is reduced. It also provides convenience for manufacturers' installation; and only one interface needs to be reserved for external communication.

[0021] (2) The BDU module proposed in the present application has excellent heat dissipation performance. Specifically, the contact point of the main relay is connected to the connecting bar, and the copper bar and the raised part are attached to the bottom shell through an insulating thermal pad. When the connecting bar is a copper bar, the thermal conductivity is about 400W / mK, which can quickly conduct the heat generated by the main relay to the bottom shell, and can quickly exchange heat. At the same time, compared with the prior art, by pre-burying the copper bar inside the shell, it can avoid the large heat generated by the contact part of the relay to cause the shell of the battery pack to heat up quickly, effectively avoiding the risk of structural failure due to overheating.

[0022] (3) The BDU module proposed in this application has an extremely compressed external size. Specifically, the BDU module can realize the use of downsized internal relays, reduce production costs, and reduce the size of internal components. It ensures the structural strength while reasonably arranging the devices. By integrating the BMS module inside the BDU module, more space can be provided for the battery pack to arrange the batteries.

[0023] (4) The BDU module proposed in this application has excellent product stability. By introducing an auxiliary PCB board, other auxiliary components are integrated into the auxiliary PCB board, which reduces the external wiring harness interface as much as possible and reduces the end-to-end snap-on connection, thereby improving product reliability and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the BDU module of the utility model from the right side perspective;

[0026] Figure 3 This is a schematic diagram of the structure of the BDU module of the utility model from the left side perspective;

[0027] Figure 4 This is a schematic diagram of the structure of the BDU module of the utility model from the bottom perspective;

[0028] Figure 5 This is a schematic diagram of the structure of the BDU module of the utility model from a top-down perspective;

[0029] Figure 6 This is a schematic diagram of the structure of the electrical components on the auxiliary PCB board inside the BDU module of the utility model;

[0030] Figure 7 It is a schematic diagram of the internal cross-sectional structure of the BDU module of the utility model.

[0031] In the figure: 1. BDU module; 2. main relay; 3. BMS module; 4. copper busbar; 5. heat-conducting medium; 6. auxiliary PCB board; 7. pre-charging resistor; 8. pre-charging relay; 9. heating relay; 10. heating fuse; 11. heating output terminal; 12. outer shell; 101. bottom shell. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0033] Example 1

[0034] like Figure 1-7 As shown, this embodiment proposes an enhanced heat dissipation battery management and energy circuit breaker unit, including a BDU module 1, the BDU module 1 includes a shell 12 and a main relay 2 arranged in the shell 12; the main relay 2 is inverted in the shell 12, the main relay 2 is connected to a connecting row 4, the connecting row 4 is provided with a protrusion toward the bottom shell 101, and the protrusion and the bottom shell 101 are filled with a heat conductive medium 5.

[0035] The connecting bar 4 may be a copper bar, an aluminum bar, or a copper-clad aluminum bar.

[0036] As a further preference, a BMS module 3 is provided in the BDU module 1 .

[0037] It can be understood that, compared with the prior art in which the BMS module and the BDU module in the battery pack are two sets of shells, the present application integrates the BMS module inside the BDU module, which reduces the production cost and provides convenience for the manufacturer's installation. The original need to install the BMS module and the BDU module separately has been changed to being integrated inside a shell 12 in the present application, that is, the work of each collection point can be realized inside, and only the external communication interface needs to be left in the shell. That is, the enhanced heat dissipation battery management and energy circuit breaker unit proposed in the present application is highly integrated.

[0038] Accordingly, by integrating the BMS module inside the BDU module, more space can be provided for arranging batteries in the battery pack.

[0039] As a further preference, an auxiliary PCB board 6 is provided in the BDU module 1 , and at least a pre-charging resistor 7 , a pre-charging relay 8 , a heating relay 9 , a heating fuse 10 and a heating output terminal 11 are integrated on the auxiliary PCB board 6 .

[0040] As a further preferred combination Figure 5, the BMS module 3, the auxiliary PCB board 6 and the main relay 2 are arranged in sequence with gaps between them.

[0041] As a further preferred embodiment, gaps are provided between the main relay 2 , the pre-charging relay 8 , the heating relay 9 and the housing 12 .

[0042] It is understandable that in this application, all relay components inside the BDU module are installed in the air, that is, to achieve contact with the shell as much as possible, give priority to ensuring the contact between the connecting bar 4 and the heat-conducting medium 5 on the bottom shell 101, and reduce safety risks. It has more convenient installation properties and realizes the diversification of copper busbar structures. Compared with the copper busbar pre-embedded method in the prior art, it reduces production costs.

[0043] As a further preferred embodiment, the auxiliary PCB board 6 and the BMS module 3 are connected via a centralized wiring harness. Accordingly, in the present application, an auxiliary PCB board 6 is introduced inside the BDU module, so that other auxiliary devices (including at least pre-charging resistor 7, pre-charging relay 8, heating relay 9, heating fuse 10 and heating output terminal 11) are integrated onto the auxiliary PCB board 6, so that the external wiring harness interface of the entire BDU module 1 is reduced as much as possible, the end-to-end snap-on connection is reduced, and the product reliability and stability are improved.

[0044] As a further preferred combination Figure 2 and 3 The main relay 2 includes a main positive relay, a main negative relay, a fast charging positive relay and a fast charging negative relay.

[0045] As further preferred, the heat-conducting medium 5 is a solid material or a semi-solid material, the solid material is a thermal pad, and the semi-solid material is any one of thermally conductive gel, thermally conductive mud and thermally conductive potting glue.

[0046] Combination Figure 7 When the heat-conducting medium 5 is made of solid material, such as a thermal pad, the thermal pad is embedded in the surface of the bottom shell 101 (by opening a notch on the surface of the corresponding protrusion of the bottom shell 101); if it is a semi-solid material, it is placed under the protrusion of the connecting row 4 (on the surface of the bottom shell 101) by tooling coating, gluing, etc.

[0047] It should be emphasized here that Figure 2 and 3 , connected to the connecting row 4 through the contact points of the main relay 2 (including the main positive relay, the main negative relay, the fast charging positive relay and the fast charging negative relay), and the main relay 2 is inverted, and the raised part of the connecting row 4 is attached to the bottom shell 101 through the heat-conducting medium 5, and the thermal conductivity of the connecting row 4 is about 400W / mK, which can quickly conduct the heat generated by the main relay to the bottom shell 101, and can quickly exchange heat, that is, the BDU module in this application has better heat dissipation efficiency.

[0048] For example, in the present application, the BDU module 1 has a more excellent heat dissipation performance, so that the relays inside the BDU module 1 can be used with reduced specifications, for example, replacing 250A relays with 150A specifications, and replacing 200A relays with 100A specifications. (The failure mode of the relay is: the temperature exceeds the structural safety temperature of the shell, and the heat source of the relay comes from the current passing through. The relay itself has resistance, so the greater the current passing through the relay of the same specification, the greater the heat generated.) That is, the BDU module 1 proposed in the present application can realize the use of reduced specifications of internal relays, reduce production costs, and at the same time reduce the size of internal components, ensuring the structural strength while reasonably arranging the devices.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An enhanced heat dissipation battery management and energy disconnection unit, characterized in that: The BDU module (1) comprises a housing (12) and a main relay (2) arranged in the housing (12); The main relay (2) is placed upside down in the housing (12); the main relay (2) is connected to a connection row (4); the connection row (4) is provided with a protrusion facing the bottom housing (101); a heat-conducting medium (5) is filled between the protrusion and the bottom housing (101).

2. The enhanced heat dissipation battery management and energy disconnection unit according to claim 1, characterized in that: The BDU module (1) is provided with a BMS module (3).

3. The enhanced heat dissipation battery management and energy disconnection unit according to claim 2, characterized in that: The BDU module (1) is provided with an auxiliary PCB board (6), on which at least a pre-charging resistor (7), a pre-charging relay (8), a heating relay (9), a heating fuse (10) and a heating output terminal (11) are integrated.

4. The enhanced heat dissipation battery management and energy disconnection unit according to claim 3, characterized in that: A gap is provided between the BMS module (3), the auxiliary PCB board (6) and the main relay (2).

5. The enhanced heat dissipation battery management and energy disconnection unit according to claim 3, characterized in that: The auxiliary PCB board (6) and the BMS module (3) are connected via a centralized wiring harness.

6. The enhanced heat dissipation battery management and energy disconnection unit according to claim 1, characterized in that: The main relay (2) comprises a main positive relay, a main negative relay, a fast charging positive relay and a fast charging negative relay.

7. The enhanced heat dissipation battery management and energy disconnection unit according to claim 3, characterized in that: Gaps are provided between the main relay (2), the pre-charging relay (8), the heating relay (9) and the housing (12).

8. The enhanced heat dissipation battery management and energy disconnection unit according to claim 1, characterized in that: The connecting bar (4) is a copper bar, an aluminum bar, or a copper-clad aluminum bar.

9. The enhanced heat dissipation battery management and energy disconnection unit according to claim 1, characterized in that: The heat-conducting medium (5) is a solid material or a semi-solid material, the solid material is a heat-conducting pad, and the semi-solid material is any one of a heat-conducting gel, a heat-conducting mud, and a heat-conducting potting glue.

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