Double-layer battery pack

Abstract

The invention belongs to the technical field of automobile battery packs, and discloses a double-layer battery pack which comprises a battery pack supporting bracket, a battery pack mounting bin; a protection bin; the BMS system is arranged on the upper end surface of the upper cover plate; the liquid cooling device comprises a liquid cooling sheet arranged in the protection bin, and a liquid inlet assembly and a liquid outlet assembly which are arranged in the protection bin; the liquid inlet assembly and the liquid outlet assembly are used for being connected with an external liquid cooling circulating device; cooling liquid in an external liquid cooling circulation device firstly enters the battery pack mounting bin through the liquid inlet assembly, then passes through all the liquid cooling pieces and finally flows out of the liquid outlet assembly. The structure is simple, longitudinal stacking and fixed connection of the battery packs can be achieved, it can be ensured that the space in the battery packs is simple, and quick assembly or disassembly of all components can be facilitated.

Description

Technical Field

[0001] The present invention belongs to the field of automobile battery packs, and in particular relates to a double-layer battery pack. Background Art

[0002] The battery pack is the main power source of electric vehicles. It is generally composed of multiple battery cells. The battery pack is installed between the battery cover and the bottom plate to form a battery pack. The battery pack is installed on the chassis of the electric vehicle to provide power. Since the power battery must have better performance and service life within a certain temperature range, the thermal management system of the battery pack must be efficient enough and reliable enough.

[0003] The BMS (Battery Management System) in the battery pack is the core to ensure the safe, efficient and reliable operation of the battery pack. The main functions of BMS include battery status monitoring, battery balancing management, battery protection, energy management, communication and information management, etc.

[0004] In a battery pack, since the battery modules are close to each other, they will affect each other during operation, such as insufficient heat dissipation. In addition, if you want to add or remove battery modules, you need to disassemble or replace the battery box with a larger capacity, which invisibly increases the complexity and cost of maintenance. Summary of the invention

[0005] In order to solve the problems in the related art, the present application provides a double-layer battery pack, which solves the problems existing in the current battery pack.

[0006] The technical solution of the present invention is as follows: A double-layer battery pack comprises: a battery pack support bracket, which is assembled in the frame of a vehicle; a battery pack installation compartment, which is arranged in the battery pack support bracket, and a transverse partition is provided in the battery pack installation compartment, and an upper battery pack module and a lower battery pack module are respectively installed above and below the transverse partition; a first battery cell end plate and a second battery cell end plate are installed in the battery pack installation compartment, the first battery cell end plate is connected to the upper battery pack module through a connecting line, and the second battery cell end plate is connected to the lower battery pack module through a connecting line; a high-voltage box module is provided at one end of the battery pack support bracket, and the high-voltage box module is connected to the first battery cell end plate and the second battery cell end plate through a connecting line; a protection compartment is arranged on the battery pack installation bracket At one end of the rack, two charging and discharging ports are respectively installed on the outside of the protection bin, one of the charging and discharging ports is electrically connected to the upper battery pack module through a connecting line, and the other charging and discharging port is electrically connected to the lower battery pack module through a connecting line; an upper cover is provided at the upper end of the protection bin; a BMS system is provided on the upper end surface of the upper cover; a liquid cooling device includes a liquid cooling plate provided in the protection bin, a liquid inlet assembly and a liquid outlet assembly provided in the protection bin; the liquid inlet assembly and the liquid outlet assembly are used to be connected to an external liquid cooling circulation device; the coolant in the external liquid cooling circulation device first enters the battery pack installation bin through the liquid inlet assembly, then passes through all the liquid cooling plates, and finally flows out from the liquid outlet assembly.

[0007] As a further improvement, the battery pack mounting compartment forms an upper mounting cavity above the transverse partition, an upper box body is mounted in the upper mounting cavity, and an upper box body cover is mounted on the upper box body; the upper battery pack module is mounted in the upper box body; a plurality of liquid cooling fins are provided on the inner side surface of the upper box body, and all of the liquid cooling fins are connected in sequence; an upper box body liquid inlet and an upper box body liquid outlet are provided on the upper box body; the battery pack mounting compartment forms a lower mounting cavity below the transverse partition, a lower box body is mounted in the lower mounting cavity, and a lower box body cover is mounted on the lower box body; the lower battery pack module is mounted in the lower box body; a plurality of liquid cooling fins are provided on the inner side surface of the lower box body, and all of the liquid cooling fins are connected in sequence; a lower box body liquid inlet and an upper box body liquid outlet are provided on the lower box body; the upper box body liquid inlet and the lower box body liquid inlet are connected to the liquid inlet assembly, and the upper box body liquid outlet and the lower box body liquid outlet are connected to the liquid outlet assembly.

[0008] As a further improvement, the liquid inlet assembly includes a first liquid inlet pipeline and a second liquid inlet pipeline installed on the battery pack support bracket; the first liquid inlet pipeline is connected to the liquid inlet of the upper box body, and the second liquid inlet pipeline is connected to the liquid inlet of the lower box body.

[0009] As a further improvement, the liquid outlet assembly includes a first liquid outlet pipeline and a second liquid outlet pipeline installed on the battery pack support bracket; the first liquid outlet pipeline is connected to the upper box liquid outlet, and the second liquid outlet pipeline is connected to the lower box liquid outlet.

[0010] As a further improvement, the high-voltage box module includes a box body and a box cover that match each other, a high-voltage box mainboard is arranged in the box body, and heat dissipation fins are arranged on the high-voltage box mainboard; the high-voltage box mainboard is connected to the first battery cell end plate, the second battery cell end plate, and the two charging and discharging ports through connecting wires.

[0011] As a further improvement, the BMS system includes a BMS installation cavity installed on the upper cover plate, in which a BMS controller, a wireless communication module, a display module and an information acquisition module are installed; a plurality of temperature sensors, humidity sensors and leakage detection sensors are installed in the battery pack installation compartment and the protection compartment; all sensors are connected to the BMS controller via connecting wires.

[0012] By adopting the above technical solution, compared with the prior art, the beneficial effects of the technology of this patent are: The present invention not only has a simple structure and can realize the longitudinal stacking and fixing of the battery pack, but also can ensure the simplicity of the space inside the battery pack and can facilitate the quick assembly or disassembly of various components.

[0013] The present invention has a good heat dissipation effect, and adopts liquid cooling, with high heat exchange efficiency, and can cool and dissipate heat for two battery packs at the same time. The electrical connection is stable, which can effectively promote the stable operation of the battery pack and effectively improve the service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the double-layer battery pack of the present invention.

[0016] Figure 2 It is a schematic diagram of the internal structure of the double-layer battery pack of the present invention.

[0017] Figure 3 It is a schematic diagram of the top view of the protective compartment of the double-layer battery pack of the present invention.

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the protection compartment of the double-layer battery pack of the present invention.

[0019] In the figure: 1. Battery pack support bracket; 2. Upper cover; 3. BMS installation cavity; 4. First liquid outlet pipeline; 5. Liquid outlet assembly; 6. High-voltage box mainboard; 7. Charge and discharge ports; 8. Heat dissipation fins; 9. Charge and discharge ports; 10. Liquid inlet assembly; 11. First liquid inlet pipeline; 12. Box body; 13. Liquid cooling plate; 14. Upper battery pack module; 15. Second liquid inlet pipeline; 16. Second liquid outlet pipeline. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0021] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0022] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the first information, and similarly, the second information may also be referred to as the second information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0023] Example 1

[0024] like Figure 1-4 As shown, a double-layer battery pack includes a battery pack support bracket 1, and the battery pack support bracket 1 is assembled inside the frame of a vehicle.

[0025] The battery pack installation compartment is arranged in the battery pack support bracket 1. A transverse partition is provided in the battery pack installation compartment. The upper battery pack module 14 and the lower battery pack module are respectively installed above and below the transverse partition. The first battery cell end plate and the second battery cell end plate are installed in the battery pack installation compartment. The first battery cell end plate is connected to the upper battery pack module 14 through a wire, and the second battery cell end plate is connected to the lower battery pack module through a wire. A high-voltage box module is provided at one end of the battery pack support bracket 1. The high-voltage box module is connected to the first battery cell end plate and the second battery cell end plate through a wire. The high-voltage box module includes a box body 12 and a box cover that match each other. A high-voltage box mainboard 6 is provided in the box body 12, and a heat dissipation fin 8 is provided on the high-voltage box mainboard 6. The high-voltage box mainboard 6 is connected to the first battery cell end plate and the second battery cell end plate, and the two charge and discharge ports 9 and 7 through connecting wires.

[0026] The liquid cooling device includes a liquid cooling plate 13 arranged in the protective compartment, a liquid inlet component 10 and a liquid outlet component 5 arranged in the protective compartment; the liquid inlet component 10 and the liquid outlet component 5 are used to be connected to an external liquid cooling circulation device; the coolant in the external liquid cooling circulation device first enters the battery pack installation compartment through the liquid inlet component 10, then passes through all the liquid cooling plates 13, and finally flows out from the liquid outlet component 5.

[0027] The battery pack installation compartment forms an upper installation cavity above the transverse partition, and an upper box body is installed in the upper installation cavity, an upper box body cover is installed on the upper box body, and an upper battery pack module 14 is installed in the upper box body. A plurality of liquid cooling plates 13 are provided on the inner side surface of the upper box body, and all the liquid cooling plates 13 are connected in sequence, and an upper box body liquid inlet and an upper box body liquid outlet are provided on the upper box body. The battery pack installation compartment forms a lower installation cavity below the transverse partition, and a lower box body is installed in the lower installation cavity, and a lower box body cover is installed on the lower box body. The lower battery pack module is installed in the lower box body, and a plurality of liquid cooling plates 13 are provided on the inner side surface of the lower box body, and all the liquid cooling plates 13 are connected in sequence, and a lower box body liquid inlet and an upper box body liquid outlet are provided on the lower box body. The upper box body liquid inlet and the lower box body liquid inlet are connected to the liquid inlet assembly 10, and the upper box body liquid outlet and the lower box body liquid outlet are connected to the liquid outlet assembly 5.

[0028] The liquid inlet assembly 10 includes a first liquid inlet pipeline 11 and a second liquid inlet pipeline 15 installed on the battery pack support bracket 1. The first liquid inlet pipeline 11 is connected to the liquid inlet of the upper box, and the second liquid inlet pipeline 15 is connected to the liquid inlet of the lower box. The liquid outlet assembly 5 includes a first liquid outlet pipeline 4 and a second liquid outlet pipeline 16 installed on the battery pack support bracket 1, the first liquid outlet pipeline 4 is connected to the liquid outlet of the upper box, and the second liquid outlet pipeline 16 is connected to the liquid outlet of the lower box.

[0029] The protective compartment is provided at one end of the battery pack mounting bracket, and two charging and discharging ports 9 and 7 are respectively installed on the outer side of the protective compartment, one charging and discharging port 7 is electrically connected to the upper battery pack module 14 through a connecting line, and the other charging and discharging port 9 is electrically connected to the lower battery pack module through a connecting line. An upper cover plate 2 is provided at the upper end of the protective compartment.

[0030] The BMS system is provided on the upper end surface of the upper cover plate 2. The BMS system includes a BMS installation cavity 3 installed on the upper cover plate 2, in which a BMS controller, a wireless communication module, a display module and an information acquisition module are installed; a plurality of temperature sensors, humidity sensors and leakage detection sensors are installed in the battery pack installation compartment and the protection compartment; all sensors are connected to the BMS controller via connecting wires.

[0031] The present invention has a good heat dissipation effect, and adopts liquid cooling, with high heat exchange efficiency, and can cool and dissipate heat for two battery packs at the same time. The electrical connection is stable, which can effectively promote the stable operation of the battery pack and effectively improve the service life of the battery pack.

[0032] Those skilled in the art will readily conceive of other embodiments of the invention after considering the specification and practicing the invention herein. This application is intended to cover any variation, use, or adaptation of the invention that follows the general principles of the invention and includes common knowledge or customary techniques in the art not covered by the invention. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0033] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A double-layer battery pack, characterized in that: include: The battery pack support bracket is assembled in the vehicle frame; A battery pack installation compartment is arranged in the battery pack support bracket, a transverse partition is arranged in the battery pack installation compartment, and an upper battery pack module and a lower battery pack module are respectively installed above and below the transverse partition; The battery pack installation compartment is provided with a first battery cell end plate and a second battery cell end plate, the first battery cell end plate is connected to the upper battery pack module via a connecting line, and the second battery cell end plate is connected to the lower battery pack module via a connecting line; a high-voltage box module is provided at one end of the battery pack support bracket, and the high-voltage box module is connected to the first battery cell end plate and the second battery cell end plate via a connecting line; A protection compartment is provided at one end of the battery pack mounting bracket, two charging and discharging ports are respectively installed on the outer side of the protection compartment, one of the charging and discharging ports is electrically connected to the upper battery pack module through a connecting line, and the other charging and discharging port is electrically connected to the lower battery pack module through a connecting line; an upper cover plate is provided at the upper end of the protection compartment; The BMS system includes a device disposed on the upper end surface of the upper cover plate; The liquid cooling device includes a liquid cooling plate arranged in the protective compartment, a liquid inlet assembly and a liquid outlet assembly arranged in the protective compartment; the liquid inlet assembly and the liquid outlet assembly are used to be connected to an external liquid cooling circulation device; the coolant in the external liquid cooling circulation device first enters the battery pack installation compartment through the liquid inlet assembly, then passes through all the liquid cooling plates, and finally flows out from the liquid outlet assembly.

2. A double-layer battery pack according to claim 1, characterized in that: The battery pack installation compartment forms an upper installation cavity above the transverse partition, an upper box is installed in the upper installation cavity, and an upper box cover is installed on the upper box; the upper battery pack module is installed in the upper box; a plurality of liquid cooling fins are arranged on the inner side of the upper box, and all the liquid cooling fins are connected in sequence; an upper box liquid inlet and an upper box liquid outlet are arranged on the upper box; The battery pack installation compartment forms a lower installation cavity below the transverse partition, a lower box is installed in the lower installation cavity, and a lower box cover is installed on the lower box; the lower battery pack module is installed in the lower box; a plurality of liquid cooling plates are arranged on the inner side of the lower box, and all the liquid cooling plates are connected in sequence; a lower box liquid inlet and an upper box liquid outlet are arranged on the lower box; The upper box body liquid inlet and the lower box body liquid inlet are connected to the liquid inlet assembly, and the upper box body liquid outlet and the lower box body liquid outlet are connected to the liquid outlet assembly.

3. A double-layer battery pack according to claim 2, characterized in that: The liquid inlet assembly includes a first liquid inlet pipeline and a second liquid inlet pipeline installed on the battery pack support bracket; the first liquid inlet pipeline is connected to the liquid inlet of the upper box body, and the second liquid inlet pipeline is connected to the liquid inlet of the lower box body.

4. A double-layer battery pack according to claim 3, characterized in that: The liquid outlet assembly includes a first liquid outlet pipeline and a second liquid outlet pipeline installed on the battery pack support bracket; the first liquid outlet pipeline is connected to the upper box liquid outlet, and the second liquid outlet pipeline is connected to the lower box liquid outlet.

5. A double-layer battery pack according to claim 4, characterized in that: The high-voltage box module includes a box body and a box cover that match each other. A high-voltage box mainboard is arranged in the box body, and a heat dissipation fin is arranged on the high-voltage box mainboard. The high-voltage box mainboard is connected to the first battery cell end plate, the second battery cell end plate, and two charging and discharging ports through connecting wires.

6. A double-layer battery pack according to claim 5, characterized in that: The BMS system includes a BMS installation cavity installed on the upper cover plate, in which a BMS controller, a wireless communication module, a display module and an information acquisition module are installed; a plurality of temperature sensors, humidity sensors and leakage detection sensors are installed in the battery pack installation compartment and the protection compartment; all sensors are connected to the BMS controller via connecting wires.

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