CN219066910U - Battery pack - Google Patents

Abstract

The utility model discloses a battery pack, comprising: the shell is provided with a signal interface, a first voltage positive phase interface, a second voltage positive phase interface and a voltage negative phase interface; the battery cell is used for outputting a first voltage, and the negative electrode of the battery cell is connected with a voltage negative interface; the PCB is integrated with a DCDC module and a battery management module, the battery management module is respectively connected with the positive electrode of the battery core, the signal interface and the first voltage positive interface, the DCDC module is connected with the second voltage positive interface, and the DCDC module is at least used for converting the first voltage into the second voltage; and the PCB is connected with the cooling assembly through the heat conducting piece so that heat generated by the PCB is conducted to the cooling assembly through the heat conducting piece. The DCDC module and the battery management module are integrated on a PCB, so that the size of the battery pack is reduced, and the miniaturization of the battery pack is realized. In addition, the cooling system can only be used for cooling all circuit structures of the battery pack, so that the cooling energy consumption is reduced, and the simplification of the structure of the battery pack is further realized.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

Lithium batteries are used as a novel energy source in the fields of power electronics, new energy automobiles and the like. In order to meet the national requirements of energy conservation and emission reduction, a 48V hybrid system is adopted on an automobile to become an effective solution.

However, the current 48V power battery system for the vehicle occupies too much space of the vehicle due to the large size, so that the installation layout of other load electric elements for the vehicle is limited, and the assembly of the vehicle is not facilitated. The existing 48V power battery system also has the problem of high cooling energy consumption, and is not beneficial to the realization of the reduction of the power consumption of the automobile.

Disclosure of Invention

The utility model aims to solve the problems of oversized power battery and high cooling energy consumption of the vehicle in the prior art.

To solve the above technical problems, an embodiment of the present application discloses a battery pack, including:

the shell is provided with a signal interface and a plurality of voltage interfaces, wherein the plurality of voltage interfaces comprise a first voltage positive phase interface, a second voltage positive phase interface and a voltage negative phase interface;

the battery cell is arranged in the shell and used for outputting a first voltage, and the negative electrode of the battery cell is connected with the voltage negative interface;

the PCB is arranged in the shell, a DCDC module and a battery management module are integrated on the PCB, the battery management module is respectively connected with the positive electrode of the battery core, the signal interface and the first voltage positive interface, the DCDC module is connected with the second voltage positive interface, and the DCDC module is at least used for converting the first voltage into the second voltage;

and the cooling assembly is arranged in the shell, and the PCB is connected with the cooling assembly through the heat conducting piece so that heat generated by the PCB is conducted to the cooling assembly through the heat conducting piece.

By adopting the technical scheme, the DCDC module and the battery management module are integrated on the PCB, so that the size of the battery pack is reduced, and the battery pack is convenient to miniaturize. In addition, in order to be convenient for the PCB board after the integration fully dispels the heat, this application has still set up cooling module and heat-conducting plate, and the heat-conducting plate contacts with PCB board and cooling module respectively to make the heat accessible heat-conducting plate that the PCB produced transmit cooling module, be convenient for realize the cooling of PCB board. And because DCDC module and battery management module integrate in a PCB board, consequently this application can only use a set of cooling system to realize the cooling of each circuit structure of battery package, has reduced the cooling power consumption, still further realizes the simplification of battery package structure. And the battery pack contains a cooling plate (specifically can be a water cooling plate) for cooling heating elements such as a battery core, a PCB (printed circuit board) and the like, and the cooling of the DCDC power part is changed from air cooling to water cooling, so that the power of the DCDC is improved from 1.8kW to 2.4kW, and the working performance of the DCDC is improved.

In some possible implementations, in the battery pack provided in the embodiments of the present application, the DCDC module and the battery management module share the same control circuit, and the control circuit is connected with the signal interface; the DCDC module further comprises a first power circuit connected with the control circuit, the battery management module further comprises a second power circuit connected with the control circuit, and the first power circuit and the second power circuit are both connected with the positive electrode of the battery cell.

Through comparing DCDC module as an independent part, make it connect with the battery management system of battery package through the pencil, the function integration of DCDC is packed the inside with the battery promptly this application, combines the circuit part of original same function, integrates on a control circuit, adopts a MCU (i.e. microprocessor) control, has simplified circuit structure, has reduced product cost.

In some possible implementations, in the battery pack provided by the embodiments of the present application, the control circuit includes a microprocessor, a power chip, and a CAN chip, where an input end of the power chip is connected to the second voltage source, an output end of the power chip is connected to the CAN chip and the microprocessor, and the CAN chip is further connected to the microprocessor and the signal interface, respectively; the microprocessor is also connected with the first power circuit and the second power circuit respectively.

Compare in setting up battery management module's control circuit and power circuit respectively on two PCBs, the centre is connected through copper bar and flexible flat cable, this application is with control circuit and power circuit integration on a PCB board, distributes in the different positions of PCB board for satisfy radiating while reduced the complicated connection between original each PCB board, also further reduced the cost of manufacture of product.

In some possible implementations, in the battery pack provided by the embodiments of the present application, the heat conducting member includes a heat conducting plate disposed in the housing, and the PCB board is disposed on a side surface of the battery cell and parallel to the heat conducting plate; the heat conducting plate, the PCB and the battery core are arranged above the cooling component, one surface of the PCB, which faces the heat conducting plate, is contacted with the heat conducting plate, and the lower end surface of the heat conducting plate is connected with the cooling component.

In some possible implementations, in the battery pack provided in the embodiments of the present application, a plurality of grooves or protrusions are provided on a side of the heat conducting plate facing the PCB board, and the plurality of grooves or protrusions are used for contacting with electrical components on the PCB board.

In some possible implementations, in the battery pack provided by the embodiments of the present application, a heat-conducting adhesive is disposed between the heat-conducting plate and the PCB board.

In some possible implementations, in the battery pack provided in the examples of the present application, the cooling assembly includes:

the cooling plate is paved at the bottom of the battery cell;

the circulating pipeline is arranged on the cooling plate, and cooling liquid flows in the circulating pipeline;

the liquid inlet is arranged on the cooling plate and is connected with one end of the circulating pipeline;

the liquid outlet is arranged on the cooling plate and is connected with the other end of the circulating pipeline.

In some possible embodiments, in the battery pack provided in the examples of the present application, the cooling liquid is water.

In some possible implementations, in the battery pack provided in the embodiments of the present application, the cooling plate and the heat conducting plate are made of metal materials, and the lower end surface of the heat conducting plate is welded on the cooling plate.

In some possible implementations, in the battery pack provided in the embodiments of the present application, the case includes a case body and an upper cover and a lower cover connected to the case body, wherein the upper cover and/or the lower cover is detachably connected to the case body.

Drawings

Fig. 1 is a schematic view of the overall structure of a battery pack according to an embodiment of the present application;

FIG. 2 is an exploded view of a battery pack according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a PCB board according to an embodiment of the present disclosure;

fig. 4 is a schematic circuit diagram of a battery pack according to an embodiment of the present disclosure;

fig. 5 is a schematic circuit diagram of a control circuit according to an embodiment of the present application.

Detailed Description

Further advantages and effects of the present application will be readily apparent to those skilled in the art from the present disclosure, by describing embodiments of the present application with specific examples. While the description of the present application will be presented in conjunction with the preferred embodiments, it is not intended that the features of this application be limited to only this implementation. Rather, the purpose of the description presented in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the present application. The following description contains many specific details in order to provide a thorough understanding of the present application. The present application may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the focus of the application. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

It should be noted that in this specification, like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present embodiment, it should be noted that, the orientation or positional relationship indicated by the terms "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is conventionally put in use, are merely for convenience of description and simplification of the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium; either mechanically or electrically. The specific meaning of the above terms in the present embodiment can be understood in a specific case by those of ordinary skill in the art.

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

As shown in fig. 1 to 4, an embodiment of the present application provides a battery pack including a housing 1 and a battery cell 3, a PCB (Printed Circuit Board, PCB) board 2, and a cooling assembly 4 disposed within the housing 1.

Specifically, the housing 1 is provided with a signal interface 111, a first voltage positive interface 112, a second voltage positive interface 114, and a voltage negative interface 113. The battery core 3 is used for outputting a first voltage, and the DCDC module and the battery management module are integrated on the PCB 2. The positive electrode of the battery cell 3 is connected with the battery management module, and the negative electrode of the battery cell 3 is connected with the voltage negative interface 113. The DCDC module and the battery management module are respectively connected with the positive electrode of the battery core 3, the first voltage positive interface 112, the signal interface 111 and the second voltage positive interface 114, specifically, the battery management module is respectively connected with the positive electrode of the battery core 3, the signal interface 111, the first voltage positive interface 112 and the DCDC module, at least used for providing the first voltage to the DCDC module, the DCDC module is connected with the second voltage positive interface 114, and the DCDC module is at least used for converting the first voltage output by the battery core 3 into the second voltage. The PCB board 2 is also connected to the cooling assembly 4 through a heat-conducting member 5 so that heat generated from the PCB board 2 is conducted to the cooling assembly 4 through the heat-conducting member 5.

Specifically, the first voltage positive-phase interface 112, the second voltage positive-phase interface 114, and the voltage negative-phase interface 113 are connected to the battery management module, the DCDC module, and the battery cell 3 through the copper bar 8, respectively.

Further, the first voltage is higher than the second voltage, specifically, the first voltage is 48V, the second voltage is 12V, that is, the voltage of the battery cell 3 is 48V, and the dcdc module is used for converting the 48V voltage output by the battery cell 3 into 12V voltage for output. The positive interfaces of the first voltage and the second voltage are different, but they may share one negative interface, namely the voltage negative interface 113. The battery pack can be used in a 48V hybrid system of an automobile.

In the battery pack of the application, the DCDC module and the battery management module are integrated on the PCB 2, so that the size of the battery pack is reduced, and the battery pack is convenient to miniaturize. In addition, in order to be convenient for the PCB board 2 after the integration fully dispel the heat, this application has still set up cooling module 4 and heat conduction board, and the heat conduction board contacts with PCB board 2 and cooling module 4 respectively to make the heat accessible heat conduction board that the PCB produced transmit cooling module 4, be convenient for realize the cooling of PCB board 2. And because DCDC module and battery management module integrate in a PCB board 2, consequently this application can only use a set of cooling system to realize the cooling of each circuit structure of battery package, has reduced the cooling energy consumption, and further realizes the simplification of battery package structure.

For example, referring to fig. 3 to 5, in the PCB board 2, the DCDC module and the battery management module share a set of control circuits 200, and the control circuits 200 are connected to the second voltage source 7 and the signal interface 111, respectively; the DCDC module further comprises a first power circuit 100 connected to the control circuit 200, and the battery management module further comprises a second power circuit 300 connected to the control circuit 200, wherein both the first power circuit 100 and the second power circuit 300 are connected to the positive electrode of the battery cell 3. The first power circuit 100 of the DCDC module is configured to convert a first voltage into a second voltage, and the power circuit in the battery management module has a switching function.

Compared with the DCDC module serving as an independent part and connected with a battery management system of a battery pack through a wire harness, the DCDC module is integrated into the battery pack, circuit parts with the same functions are combined and integrated on the control circuit 200, and the control circuit is controlled by the MCU (i.e. the microprocessor 203), so that the circuit structure is simplified, and the product cost is reduced. And the battery pack contains a cooling plate 43 (specifically, a water cooling plate) to cool the heating elements such as the battery core 3 and the PCB 2, so that the cooling of the DCDC power part is changed from air cooling to water cooling, the power of the DCDC is improved from 1.8kW to 2.4kW, and the working performance of the DCDC is improved.

In addition, compare in setting up battery management module's control circuit 200 and power circuit respectively on two PCBs 2, the centre is connected through copper bar and flexible flat cable, and this application is with control circuit 200 and power circuit integration on a PCB board 2, distributes in the different positions of PCB board 2 for reduce the complicated connection between original each PCB board 2 when satisfying the heat dissipation, also further reduced the cost of manufacture of product.

As shown in fig. 5, the control circuit 200 includes a microprocessor 203, a power chip 201, and a CAN chip 202, wherein an input terminal of the power chip 201 is connected to the second voltage source 7, an output terminal of the power chip 201 is connected to the CAN chip 202 and the microprocessor 203, respectively, for supplying power to the CAN chip 202 and the microprocessor 203 (specifically, the power chip 201 may supply 5V voltage to the CAN chip 202 and the microprocessor 203, respectively), an input terminal of the CAN chip 202 is further connected to the signal interface 111, for receiving a signal output by the signal interface 111, and an output terminal of the CAN chip 202 is connected to an input terminal of the microprocessor 203, so that data interaction between the CAN chip 202 and the microprocessor 203 is possible. The output of the microprocessor 203 is connected to the first power circuit and the second power circuit, respectively. Specifically, as shown in fig. 5, pwm_phx_ H, PWM _phx_ L, temp _mes and ai_mes signals output by the microprocessor 203 are output to the first power circuit 100 of the DCDC module. The iss_gate_control and temp_mes signals output by the microprocessor 203 are output to the second power circuit 300 of the battery management module.

Specifically, the second voltage source 7 is a power source whose power supply voltage is a second voltage, such as a 12V battery. When the battery pack is used in an automotive system (the automobile also contains a 12V low voltage battery), the second voltage positive interface 114 of the battery pack is connected to the positive electrode of the 12V battery for charging the 12V battery, and the 12V battery is connected to a 12V electrical load for supplying voltage to the 12V electrical network load.

The battery cell 3 is also provided with an explosion-proof valve 6 for preventing the battery cell 3 from explosion due to the influence of temperature and other factors.

Illustratively, with continued reference to fig. 2, the heat-conducting member 5 includes a heat-conducting plate disposed parallel to the PCB, the PCB 2 and the heat-conducting plate are both disposed on the side of the cell 3 and the heat-conducting plate abuts between the cell 3 and the PCB 2; the heat conducting plate, the PCB 2 and the battery core 3 are arranged above the cooling component 4, one surface of the PCB 2 facing the heat conducting plate is contacted with the heat conducting plate, and the lower end surface of the heat conducting plate is connected with the cooling component 4.

Specifically, the side of the heat conducting plate facing the PCB board 2 is provided with a plurality of grooves or protrusions for contacting with the electrical components on the PCB board 2. The arrangement of the grooves or the protrusions facilitates the full contact between the electric elements on the PCB 2 and the heat conducting plate, so that heat generated by the electric elements can be more rapidly conducted to the heat conducting plate, and the electric elements are prevented from being damaged due to heat accumulation.

Further, a heat conducting glue is further arranged between the PCB 2 and the heat conducting plate, so that heat conduction between the PCB 2 and the heat conducting plate is facilitated.

Illustratively, as shown in FIG. 2, the cooling assembly 4 includes a cooling plate 43. Specifically, the cooling plate 43 is provided with a circulation line, a liquid inlet 41 and a liquid outlet 42, and a cooling liquid (the cooling liquid is water) is arranged in the circulation line in a flowing manner, and the liquid inlet 41 and the liquid outlet 42 are respectively connected with two ends of the circulation line. Optionally, the liquid inlet 41 and the liquid outlet 42 are respectively provided with an elbow, so that connection with a circulation pipeline is facilitated.

Specifically, the cooling liquid circulates in the circulation pipeline, the heat generated by each electric element on the PCB board 2 is conducted to the cooling plate 43 by the heat conducting plate, so that the temperature of the cooling plate 43 rises, the cooling liquid in the circulation pipeline absorbs the heat of the cooling plate 43 due to the low temperature of the cooling liquid in the circulation pipeline, the temperature of the cooling plate 43 is reduced, the cooling liquid after absorbing the heat flows out to the cooling source arranged outside the battery pack through the liquid outlet 42, the cooling liquid releases the heat at the cooling source, the temperature is reduced, and then the cooling liquid flows back to the circulation pipeline through the liquid inlet 41, and the cooling liquid is reciprocated.

Specifically, the cooling plate 43 and the heat conducting plate are made of metal materials, and the lower end surface of the heat conducting plate is welded on the cooling plate 43. Further, the cooling plate 43 is disposed perpendicular to the heat conducting plate, so that the heat conducting plate and the cooling plate 43 can be welded conveniently.

Further, the housing 1 includes a housing main body 11 and an upper cover 12 and a lower cover 13 connected to the housing main body 11, wherein the upper cover 12 and/or the lower cover 13 are detachably connected to the housing main body 11, so that the housing 1 is convenient to detach.

The battery pack has a voltage conversion function, can convert 48V voltage into 12V voltage, is directly connected with a 12V power utilization network through a 12V+ interface (namely a second voltage normal phase interface 114), and improves the applicability of the battery pack; and the PCB in the battery pack of this application has contained control circuit 200 and power circuit, through selecting MCU that has suitable interface quantity for DCDC module and battery management module share a control circuit 200, and control circuit 200 only contains an MCU, a power chip 201 and a CAN chip 202, has simplified the circuit structure of battery pack, has reduced the cost of manufacture of product. In addition, in the battery pack of the application, the PCB 2 is located on the side face of the battery core 3 and is connected with the water cooling plate (namely the cooling plate 43) through a heat conducting metal plate, so that the PCB 2 can fully conduct heat generated by the heat conducting metal plate to the water cooling system at the bottom through the heat conducting plate, and the cooling performance of the battery pack is enhanced.

While the present application has been shown and described with respect to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that the foregoing is a further detailed description of the present application in conjunction with the specific embodiments and is not intended to limit the practice of the present application to such descriptions. Various changes in form and detail may be made therein by those skilled in the art, including a few simple inferences or alternatives, without departing from the spirit and scope of the present application.

Claims (10)

1. A battery pack, comprising:

the shell is provided with a signal interface and a plurality of voltage interfaces, wherein the voltage interfaces comprise a first voltage positive interface, a second voltage positive interface and a voltage negative interface;

the battery cell is arranged in the shell and used for outputting a first voltage, and the negative electrode of the battery cell is connected with the voltage negative interface;

the PCB is arranged in the shell, a DCDC module and a battery management module are integrated on the PCB, the battery management module is respectively connected with the anode of the battery cell, the signal interface, the first voltage positive interface and the DCDC module, the DCDC module is also connected with the second voltage positive interface, and the DCDC module is at least used for converting the first voltage into the second voltage;

and the cooling assembly is arranged in the shell, and the PCB is connected with the cooling assembly through a heat conduction piece so that heat generated by the PCB is conducted to the cooling assembly through the heat conduction piece.

2. The battery pack of claim 1, wherein the DCDC module and the battery management module share the same control circuit, the control circuit being connected with the signal interface; the DCDC module further comprises a first power circuit connected with the control circuit, the battery management module further comprises a second power circuit connected with the control circuit, and the first power circuit and the second power circuit are both connected with the positive electrode of the battery cell.

3. The battery pack of claim 2, wherein the control circuit comprises a microprocessor, a power chip and a CAN chip, wherein an input end of the power chip is connected with the second voltage source, an output end of the power chip is connected with the CAN chip and the microprocessor respectively, and the CAN chip is also connected with the microprocessor and the signal interface respectively; the microprocessor is also respectively connected with the first power circuit and the second power circuit.

4. The battery pack of claim 1, wherein the heat conductive member comprises a heat conductive plate disposed within the housing, the PCB being disposed on a side of the cell and parallel to the heat conductive plate; the heat conducting plate, the PCB and the battery cell are arranged above the cooling assembly, one surface of the PCB facing the heat conducting plate is contacted with the heat conducting plate, and the lower end surface of the heat conducting plate is connected with the cooling assembly.

5. The battery pack of claim 4, wherein a side of the heat conductive plate facing the PCB is provided with a plurality of grooves or protrusions for contacting electrical components on the PCB.

6. The battery pack of claim 4, wherein a thermal conductive adhesive is disposed between the thermal conductive plate and the PCB.

7. The battery pack of claim 4, wherein the cooling assembly comprises:

the cooling plate is laid at the bottom of the battery cell;

the circulating pipeline is arranged on the cooling plate, and cooling liquid flows in the circulating pipeline;

the liquid inlet is arranged on the cooling plate and is connected with one end of the circulating pipeline;

the liquid outlet is arranged on the cooling plate and is connected with the other end of the circulating pipeline.

8. The battery pack of claim 7, wherein the cooling fluid is water.

9. The battery pack of claim 7, wherein the cooling plate and the heat conducting plate are made of metal materials, and a lower end surface of the heat conducting plate is welded to the cooling plate.

10. The battery pack according to claim 1, wherein the case includes a case main body and upper and lower covers connected to the case main body, wherein the upper cover and/or the lower cover is detachably connected to the case main body.

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