A dual-layer battery pack system

Abstract

This invention belongs to the field of battery technology and provides a double-layer battery pack system, comprising: a housing with several mounting beams on its inner surface; a first liquid cooling plate mounted on the surface of the mounting beams; the first liquid cooling plate having several semi-enclosed first inner cavities, in which a first layer of battery cells is installed; a second liquid cooling plate mounted on the bottom surface of the housing, located below the mounting beams; the second liquid cooling plate and the mounting beams forming several semi-enclosed second inner cavities, in which a second layer of battery cells is installed; and several temperature-sensing brackets mounted on the surface of the battery cells away from the first liquid cooling plate. This invention provides a first liquid cooling plate on the mounting beams of the housing, which forms a semi-enclosed inner cavity structure. After the battery cells are installed in the inner cavity structure, their displacement under vibration can be reduced or avoided, improving stability and safety.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and specifically relates to a double-layer battery pack system. Background Technology

[0002] With the widespread application of lithium batteries in commercial vehicles and construction machinery, the industry has placed higher demands on the energy density and integration level of battery systems. At the same time, companies are facing pressure to reduce costs, and customers have strict limitations on battery pack space, making it inevitable to improve the integration level of battery packs.

[0003] However, many existing battery pack and module integration solutions have significant drawbacks. For example, battery cells in some battery systems are prone to displacement and shifting under complex operating conditions and vibration. This can not only cause battery system failure but also potentially trigger serious safety hazards such as thermal runaway, threatening equipment operation and personnel safety. Utility Model Content

[0004] To address the problems in the background art, this utility model proposes a double-layer battery pack system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A dual-layer battery pack system, comprising:

[0007] The box body has several mounting beams on its inner surface;

[0008] A first liquid cooling plate is mounted on the surface of the mounting beam; the first liquid cooling plate is provided with a plurality of semi-enclosed first inner cavities, and a first layer of battery cells is installed in the first inner cavities;

[0009] The second liquid cooling plate is installed on the bottom surface of the housing, located below the mounting beam;

[0010] The second liquid cooling plate and the mounting beam form several semi-enclosed second inner cavities, and the second inner cavities are equipped with the second layer of battery cells;

[0011] Several temperature-sensing brackets are mounted on the surface of the battery cell.

[0012] Preferably, in the housing, the mounting beam includes a plurality of longitudinal beams and a plurality of transverse beams;

[0013] Each of the longitudinal beams is arranged along the length of the box body and is connected to the inner sidewall of the box body;

[0014] Each of the aforementioned crossbeams is arranged along the width direction of the box body, perpendicular to the longitudinal beams, and its two ends are connected to the inner sidewalls of the box body;

[0015] The longitudinal beam, the transverse beam, and the second liquid cooling plate form the semi-enclosed second inner cavity.

[0016] Preferably, the longitudinal beam has a trapezoidal cross-section and is welded or riveted to the inner sidewall of the box body;

[0017] The crossbeam is a double-layer profile structure. The lower profile is bolted to the bottom of the box, and the upper profile is welded to the upper surface of the lower profile and connected to the inner side wall of the box at both ends by bolts.

[0018] Preferably, the first liquid cooling plate has integral skirts on both sides of its surface along the length direction;

[0019] Between the skirts on both sides of the surface of the first liquid cooling plate, several end plates are connected by bolts, thereby forming several semi-enclosed first inner cavities.

[0020] Preferably, on the first liquid cooling plate:

[0021] At least one end plate is located at one end of the first liquid cooling plate;

[0022] At least one end plate is located at the other end of the first liquid cooling plate.

[0023] Preferably, a plurality of screw holes are provided on the outer side of the skirt on the surface of the first liquid cooling plate for mounting the first liquid cooling plate on the mounting beam of the housing.

[0024] Preferably, the upper surface of the battery cell is provided with a plurality of tabs;

[0025] Each of the temperature-sensing brackets is connected to a corresponding tab.

[0026] Preferably, the surface of the temperature-sensing bracket is provided with mesh holes and slots;

[0027] After the temperature-sensing bracket is installed on the surface of the battery cell, the mesh holes correspond to the position of the cell explosion-proof valve integrated in the battery cell.

[0028] Several slots are provided and distributed on both sides of the mesh holes for fixing temperature sensors.

[0029] Preferably, the housing is bolted to a cover, which is used to protect the battery cell.

[0030] Preferably, both the first liquid cooling plate and the second liquid cooling plate have built-in cooling water channels, and the cooling water channels are respectively connected to corresponding water nozzles, which are installed on the end face of the housing.

[0031] The beneficial effects of this utility model are:

[0032] 1. The present invention provides a first liquid cooling plate on the mounting beam of the housing. The first liquid cooling plate can form a semi-enclosed inner cavity structure. After the battery unit is installed in the inner cavity structure, its displacement under vibration can be reduced or avoided, thereby improving stability and safety.

[0033] 2. This utility model has a high degree of integration, and is equipped with a first liquid cooling plate and a second liquid cooling plate, which improves the heat dissipation effect of the battery pack structure.

[0034] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of a double-layer battery pack system according to the present invention is shown;

[0037] Figure 2 A structural schematic diagram of the box body and mounting beam of this utility model is shown;

[0038] Figure 3 A schematic diagram of the structure of the first liquid cooling plate of this utility model is shown;

[0039] Figure 4 A schematic diagram of the temperature-sensing bracket of this utility model is shown.

[0040] In the diagram: 1. Box cover; 2. Box body; 201. Longitudinal beam; 202. Cross beam; 3. Battery unit; 301. Battery cover plate; 4. First liquid cooling plate; 401. Skirt; 402. End plate; 5. Temperature sensing bracket; 501. Mesh hole; 502. Slot; 6. Second liquid cooling plate. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] like Figure 1 As shown, a double-layer battery pack system includes a cover 1, a housing 2, a battery cell 3, a first liquid cooling plate 4, a second liquid cooling plate 6, and several water nozzles 7.

[0043] Multiple mounting beams are provided on the inner surface of the housing 2 to provide a stable support foundation for each component of the system. The first liquid cooling plate 4 is fixed to the surface of the mounting beams and has multiple semi-enclosed first inner cavities to accommodate the installation of the first layer of battery units 3. This structural design effectively improves heat dissipation efficiency by increasing the contact area between the battery and the liquid cooling plate, ensuring the temperature stability of the battery during charging and discharging. In addition, the inner cavity of the first liquid cooling plate 4 can prevent the battery units 3 from moving during vibration, thus improving the stability of the battery units 3.

[0044] The cover 2 is connected to the box body 1 by bolts. It can protect the battery unit 3, and the surface of the battery unit 3 is also covered with a battery cover plate 301.

[0045] In addition, the second liquid cooling plate 6 is installed below the mounting beam on the bottom surface of the housing 2, forming a double-layer liquid cooling system with the first liquid cooling plate 4. This allows for all-around temperature regulation of the battery pack, reducing the temperature difference within the battery pack and improving the overall performance and safety of the battery system. Several temperature-sensing brackets 5 are installed on the surface of the battery cell 3 (e.g., Figure 1 In the first layer of battery cells 3, a temperature-sensing bracket 5 is installed on the upper surface, which can monitor the changes in battery surface temperature in real time. The collected data can be used as a basis for adjusting the system temperature control strategy, making the liquid cooling system operate more efficiently. Moreover, the second liquid cooling plate 6, when combined with the mounting beam, can form several semi-enclosed second inner cavities, which can be used to install the second layer of battery cells 3.

[0046] In addition, cooling water channels are provided inside the first liquid cooling plate 4 and the second liquid cooling plate 6. These cooling water channels are respectively connected to the corresponding water nozzles 7 (located on the end face of the housing 2), which serve as coolant flow interfaces to ensure that the coolant circulates within the first and second liquid cooling plates and maintains the continuous operation of the system's thermal management function.

[0047] like Figure 2As shown, to improve the stability of the box 2, the mounting beams can be set up as follows: First, longitudinal beams 201 are set along the length of the box 2, and each longitudinal beam 201 is connected to the inner wall of the box 2 by welding, riveting, or splicing with slots. Then, each transverse beam 202 is set along the width of the box 2, perpendicular to the longitudinal beams 201, and both ends are connected to the inner sidewall of the box 2 by bolts.

[0048] Optionally, in Figure 2 In the structure, four longitudinal beams 201 are provided, and two beams are welded to the side walls on both sides of the housing 2. A space for the installation of crossbeams 202 is reserved between the two longitudinal beams 201. Three crossbeams 202 are provided. Furthermore, the longitudinal beams 201 have a trapezoidal cross-section; the crossbeams 202 have a double-layer profile structure. The lower profile is bolted to the bottom of the housing 2, and the upper profile (shorter than the lower profile) is welded to the upper surface of the lower profile and bolted to the internal side walls of the housing 2 at both ends. Therefore, the mounting beams, combined with the second liquid-cooled plate 6, can form two second internal cavities.

[0049] like Figure 3 As shown, integral skirts 401 are provided on both sides of the surface of the first liquid cooling plate 4 along the length direction; between the skirts 401 on both sides of the surface of the first liquid cooling plate 4, several end plates 402 are connected by bolts, thereby forming several semi-enclosed inner cavities. One end plate 402 is located at one end of the first liquid cooling plate 4, the second end plate 402 is located at the other end of the first liquid cooling plate 4, and the last end plate 402 is located in the middle of the first liquid cooling plate 4, finally forming two semi-enclosed first inner cavities.

[0050] It should be noted that after the battery unit 3 is installed in the semi-enclosed inner cavity, the skirt 401 and the end plate 402 can restrict the movement of the battery unit 3 under vibration.

[0051] Optionally, in order to improve heat dissipation and achieve weight reduction, Figure 4 The end plate 402 can adopt an internally hollow profile structure. Moreover, on the surface of the first liquid cooling plate 4, several screw holes are provided on the outer side of the skirt 401. These screw holes are used with bolts to install the first liquid cooling plate 4 onto the mounting beam of the housing 2.

[0052] like Figure 4 As shown, the surface of the temperature sensing bracket 5 is provided with mesh holes 501 and slots 502. The mesh holes 501 correspond to the position of the cell explosion-proof valve integrated in the battery unit 3, maintaining internal pressure balance within the cell and ensuring battery safety. The slots 502 are symmetrically distributed on both sides of the mesh holes 501, securely housing the temperature sensor and enabling accurate monitoring of the temperature of the battery unit 3.

[0053] During installation, the temperature sensing bracket 5 can be electrically connected to the tabs on the surface of the battery unit 3. This connection method not only simplifies the wiring layout of the temperature monitoring system, but also provides a stable power supply and signal transmission path for the temperature sensor through the tabs, thereby improving the system integration and reliability.

[0054] In conclusion, Figures 1-4 The high degree of structural integration solves the problem that vibration of the upper battery cell 3 can easily cause the battery system to fail or even lead to dangerous situations such as thermal runaway. The upper cold plate skirt 401 design effectively prevents the upper battery cell 3 from shifting, greatly improving the reliability and safety of the battery system.

[0055] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-layer battery pack system, characterized in that, include: The box body (2) has several mounting beams on its inner surface; The first liquid cooling plate (4) is installed on the surface of the mounting beam; The first liquid cooling plate (4) is provided with several semi-enclosed first inner cavities, and the first layer of battery cells (3) are installed in the first inner cavities; The second liquid cooling plate (6) is installed on the bottom surface of the inner side of the box (2) and is located below the mounting beam; The second liquid cooling plate (6) and the mounting beam form several semi-enclosed second inner cavities, and the second inner cavities are equipped with second-layer battery cells (3). Several temperature-sensing brackets (5) are mounted on the surface of the battery cell (3).

2. The dual-layer battery pack system according to claim 1, characterized in that, In the box body (2), the mounting beam includes a plurality of longitudinal beams (201) and a plurality of transverse beams (202); Each of the longitudinal beams (201) is arranged along the length of the box body (2) and is connected to the inner sidewall of the box body (2); Each of the crossbeams (202) is arranged along the width direction of the box (2), perpendicular to the longitudinal beam (201), and its two ends are connected to the inner sidewall of the box (2); The longitudinal beam (201), the transverse beam (202), and the second liquid cooling plate (6) form the semi-enclosed second inner cavity.

3. The dual-layer battery pack system according to claim 2, characterized in that, The longitudinal beam (201) has a trapezoidal cross-section and is welded or riveted to the inner sidewall of the box (2); The crossbeam (202) is a double-layer profile structure. The lower profile is installed at the bottom of the box (2) by bolts, and the upper profile is welded to the upper surface of the lower profile and connected to the inner side wall of the box (2) by bolts at both ends.

4. A dual-layer battery pack system according to claim 1, characterized in that, On both sides of the surface of the first liquid cooling plate (4), an integral skirt (401) is provided along the length direction; Between the skirts (401) on both sides of the surface of the first liquid cooling plate (4), several end plates (402) are connected by bolts, thereby forming several semi-enclosed first inner cavities.

5. A dual-layer battery pack system according to claim 4, characterized in that, On the first liquid cooling plate (4): At least one end plate (402) is located at one end of the first liquid cooling plate (4); At least one end plate (402) is located at the other end of the first liquid cooling plate (4).

6. A dual-layer battery pack system according to claim 4, characterized in that, On the surface of the first liquid cooling plate (4), a plurality of screw holes are provided on the outer side of the skirt (401) for mounting the first liquid cooling plate (4) on the mounting beam of the housing (2).

7. A dual-layer battery pack system according to claim 1, characterized in that, The upper surface of the battery cell (3) is provided with several tabs; Each of the temperature-sensing brackets (5) is connected to the corresponding tab.

8. A dual-layer battery pack system according to claim 1, characterized in that, The surface of the temperature-sensing bracket (5) is provided with a mesh hole (501) and a slot (502); After the temperature-sensing bracket (5) is installed on the surface of the battery cell (3), the mesh hole (501) corresponds to the position of the cell explosion-proof valve integrated in the battery cell (3); Several slots (502) are provided and distributed on both sides of the mesh hole (501) for fixing the temperature sensor.

9. A dual-layer battery pack system according to any one of claims 1-8, characterized in that, The housing (2) is bolted to a cover (1), which is used to protect the battery unit (3).

10. A dual-layer battery pack system according to any one of claims 1-8, characterized in that, The first liquid cooling plate (4) and the second liquid cooling plate (6) are both equipped with cooling water channels, and the cooling water channels are respectively connected to corresponding water nozzles (7), which are installed on the end face of the housing (2).

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