Lithium battery pack with multiple units connected in series

Abstract

The lithium battery pack comprises a shell, a sealing plate is connected to the top end of the shell, a ventilation opening is formed in the outer wall of the sealing plate, an air inlet is formed in the bottom end of the shell, sealing assemblies are arranged on one side of the air inlet and one side of the ventilation opening, and the sealing assemblies are arranged on the other side of the air inlet and one side of the ventilation opening. The inner wall of the shell is partitioned into a plurality of cavities through partition plates, lithium battery units are placed in the cavities, cooling fins are arranged on the side walls of the lithium battery units, a plurality of air guide blocks are connected to the bottom ends of the partition plates, cooling fans are arranged between the air guide blocks and the air inlets, and filter plates with holes are arranged on the inner walls of the ventilation openings and the inner walls of the air inlets. According to the lithium battery pack, the lithium battery cells in the battery pack are divided into a plurality of units through the partition plates and the heat dissipation fins, so that the number of the cells through which heat dissipation airflow flows is reduced, and the temperature difference between the cells at the airflow inlet and the airflow outlet is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a multi-unit lithium battery pack connected in series. Background Art

[0002] A battery pack is the packaging of lithium batteries. The voltage and capacity of a single lithium battery cell sometimes cannot meet the needs of users. At this time, the cells need to be connected in series or parallel. The series or parallel connection of several cells plus a protective plate is a battery pack.

[0003] After searching, the Chinese patent publication number CN213150945U discloses a protective battery pack for lithium batteries, including a box body, an opening is opened on the front wall of the box body, a door body is movably embedded in the opening, a handle is fixedly installed on the outer upper wall of the box body, and a pair of clamping structures with the same structure are installed on both sides of the box body.

[0004] This patent uses an exhaust fan set on one side to dissipate heat for lithium batteries. The temperature difference between the batteries at the air flow inlet and outlet is often large. Over time, the consistency between the battery cells will deteriorate rapidly, and the life of the battery pack will be reduced. Utility Model Content

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a multi-unit lithium battery pack connected in series.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A multi-cell series-connected lithium battery pack comprises a shell, a closing plate connected to the top of the shell, a vent provided on the outer wall of the closing plate, an air inlet provided at the bottom of the shell, a closing assembly provided on one side of the air inlet and the vent, an inner wall of the shell is partitioned into a plurality of cavities by a partition plate, the partition plate is made of a heat-insulating material, a lithium battery cell is placed inside the cavity, a heat dissipation fin is provided on the side wall of the lithium battery cell, a plurality of air guide blocks are connected to the bottom end of the partition plate, the number of the air guide blocks corresponds to the number of the cavities, a heat dissipation fan is provided between the air guide block and the air inlet, and a filter plate with holes is provided on the inner wall of the vent and the air inlet.

[0008] As a further solution of the present invention: a temperature sensor is provided on one side of the lithium battery unit, a heating plate is provided on the side of the air guide block adjacent to the lithium battery unit, and a control management module is provided inside the shell.

[0009] As a further solution of the present invention: the closing assembly located on the air inlet side includes a movable rod and a plurality of perforated plates, the perforated plates are rotatably connected to the shell, and the holes on the perforated plates correspond to the perforated filter plates.

[0010] As a further solution of the present invention: the moving rod is slidably connected to the shell, one side of the moving rod is connected to an electric telescopic rod, and a rack is fixed to the outer wall of one side of the moving rod.

[0011] As a further solution of the present invention: a gear ring is provided on the outer wall of the perforated plate, and the gear ring is meshed with the rack transmission.

[0012] As a further solution of the present invention: the perforated plate and the moving rod in the closing assembly located on one side of the vent are connected to a frame arranged on the top end of the shell.

[0013] As a further solution of the present invention: the closing plate and the shell are connected by multiple fixing components, the fixing components include a moving block and a connecting hook 1, a groove is opened at one end of the shell, the moving block is slidably connected to the inner wall of the groove, the connecting hook 1 is fixed to both sides of the bottom end of the closing plate, and the top end of the moving block is rotatably connected to the connecting hook 2, and the connecting hook 1 is limitedly matched with the connecting hook 2.

[0014] As a further solution of the present invention: a limiting groove is provided on the side wall of the groove, and the two side walls of the connecting hook slide in cooperation with the limiting groove. The limiting groove consists of a vertical groove and an arc groove at the top. The bottom end of the moving block is connected by a spring, and the other end of the spring is connected to the shell.

[0015] Compared with the prior art, the present invention provides a multi-cell lithium battery pack with the following advantages:

[0016] The utility model divides the lithium battery cells in the battery pack into multiple units by providing a partition plate and heat dissipation fins, thereby reducing the number of cells through which the heat dissipation airflow flows and reducing the temperature difference between the cells at the airflow inlet and outlet.

[0017] The utility model is provided with a sealing component, which seals the vents and air inlets when the lithium battery unit is heated, thereby reducing heat exchange between the inside of the shell and the outside and lowering energy consumption for maintaining temperature.

[0018] The utility model is provided with a fixing assembly, and the closing plate can be fixed and disassembled by pulling the moving block, which is more convenient to operate than fixing with bolts.

[0019] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. The utility model has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a multi-unit lithium battery pack connected in series proposed by the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of a multi-cell lithium battery pack proposed by the present invention;

[0022] Figure 3 This is a schematic diagram of the structure between the ventilation port and the air inlet of a multi-unit lithium battery pack connected in series proposed by the present invention;

[0023] Figure 4 This is a schematic diagram of the closed assembly structure of a multi-unit lithium battery pack connected in series proposed by the present invention;

[0024] Figure 5 This is a schematic diagram of the fixed assembly structure of a multi-unit series-connected lithium battery pack proposed by the present invention.

[0025] In the figure: 1. Shell; 2. Closing plate; 3. Ventilation port; 4. Lithium battery unit; 5. Heat dissipation fin; 6. Partition plate; 7. Air inlet; 8. Cooling fan; 9. Air guide block; 10. Closing assembly; 11. Perforated plate; 12. Moving rod; 13. Gear ring; 14. Rack; 15. Fixed assembly; 16. Moving block; 17. Connecting hook 1; 18. Spring; 19. Connecting hook 2; 20. Limiting groove. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. Example

[0028] A multi-cell lithium battery pack, such as Figures 1 to 4As shown, it includes a shell 1, the top of the shell 1 is connected to a closing plate 2, the outer wall of the closing plate 2 is provided with a vent 3, the bottom of the shell 1 is provided with an air inlet 7, and a closing component 10 is provided on one side of the air inlet 7 and the vent 3. The inner wall of the shell 1 is divided into multiple cavities by a partition plate 6, and the partition plate 6 is made of heat-insulating material. A lithium battery unit 4 is placed inside the cavity, and the lithium battery unit 4 is composed of multiple battery cells. Multiple lithium battery units 4 are connected in series, and the side walls of the lithium battery unit 4 are provided with heat dissipation fins 5. The bottom end of the partition plate 6 is connected to multiple air guide blocks 9, and the number of the air guide blocks 9 corresponds to the number of cavities. A heat dissipation fan 8 is provided between the air guide block 9 and the air inlet 7, and the inner walls of the vent 3 and the air inlet 7 are both provided with a perforated filter plate. A temperature sensor is provided on one side of the lithium battery unit 4, and a heating plate is provided on the side adjacent to the air guide block 9 and the lithium battery unit 4. A control and management module is provided inside the shell 1, and the control and management module includes a control submodule and an information collection and analysis submodule.

[0029] The closing assembly 10 located on the side of the air inlet 7 includes a moving rod 12 and a plurality of perforated plates 11, the perforated plates 11 are rotatably connected to the shell 1, the holes on the perforated plates 11 correspond to the perforated filter plates, the moving rod 12 is slidably connected to the shell 1, one side of the moving rod 12 is connected to an electric telescopic rod, a rack 14 is fixed to the outer wall of one side of the moving rod 12, a gear ring 13 is provided on the outer wall of the perforated plates 11, the gear ring 13 is in transmission engagement with the rack 14, and the perforated plates 11 and the moving rod 12 in the closing assembly 10 located on the side of the vent 3 are connected to a frame provided at the top of the shell 1.

[0030] The temperature sensor detects the temperature of the environment in which the lithium battery unit 4 is located. When the temperature is higher than the optimal operating temperature of the lithium battery, the electric telescopic rod drives the moving rod 12 to move, and drives the perforated plate 11 to rotate through the gear ring 13 and the rack 14, so that the holes of the perforated plate 11 are aligned with the perforated filter plate, and then the cooling fan 8 is started to accelerate the flow of air, so that the air enters through the air inlet 7, and flows through the heat dissipation fins 5 after being guided by the air guide block 9 for heat dissipation, and the hot air flows out from the vent 3. When the temperature is lower than the optimal operating temperature of the lithium battery, the electric telescopic rod drives the moving rod 12 to move, and drives the perforated plate 11 to rotate through the gear ring 13 and the rack 14, so that the holes of the perforated plate 11 are misaligned with the perforated filter plate, the vent 3 and the air inlet 7 are closed, and the electric heating plate heats the space where the lithium battery unit 4 is located to avoid low power discharge from the lithium battery due to low temperature.

[0031] By providing the partition plate 6 and the heat dissipation fins 5, the lithium battery cells in the battery pack are divided into multiple units, the number of cells through which the heat dissipation airflow flows is reduced, and the temperature difference between the cells at the airflow inlet and outlet is reduced.

[0032] By providing the sealing assembly 10 , when the lithium battery unit 4 is heated, the vent 3 and the air inlet 7 are sealed, thereby reducing the heat exchange between the inside of the housing 1 and the outside, and reducing the energy consumption for maintaining the temperature. Example

[0033] A multi-cell lithium battery pack is provided. Based on Example 1, this embodiment makes the following improvements: Figure 1 、 Figure 5 As shown, the closing plate 2 and the shell 1 are connected by multiple fixing components 15, and the fixing component 15 includes a moving block 16 and a connecting hook 17. A groove is provided at one end of the shell 1, and the moving block 16 is slidably connected to the inner wall of the groove. The connecting hook 17 is fixed to both sides of the bottom end of the closing plate 2. The top of the moving block 16 is rotatably connected to the connecting hook 2 19, and the connecting hook 17 is limitedly matched with the connecting hook 2 19. The side wall of the groove is provided with a limiting groove 20, and the side wall of the connecting hook 2 19 is slidably matched with the limiting groove 20. The limiting groove 20 consists of a vertical groove and an arc groove at the top. The bottom end of the moving block 16 is connected by a spring 18, and the other end of the spring 18 is connected to the shell 1.

[0034] When fixing the closing plate 2, first place the closing plate 2 on the top of the shell 1, lift one end of the closing plate 2, pull the moving block 16 at the same end upward, and the connecting hook 2 19 moves upward along the limiting groove 20. When the connecting hook 2 19 moves to the arc section of the limiting groove 20, the connecting hook 2 19 is rotated outward, and then the closing plate 2 is lowered, and the connecting hook 1 17 falls accordingly. Then, the connecting hook 2 19 is reset vertically, and the moving block 16 is released. The spring 18 pulls the moving block 16 to reset, so that the connecting hook 2 19 moves down and engages with the connecting hook 1 17 to complete the fixation of the closing plate 2. When disassembling, pull the moving block 16 at one end upward, and the connecting hook 2 19 moves upward along the limiting groove 20. When the connecting hook 2 19 moves to the arc section of the limiting groove 20, the connecting hook 2 19 is rotated outward, and then one end of the closing plate 2 is lifted.

[0035] By providing the fixing assembly 15 , the closing plate 2 can be fixed and removed by pulling the moving block 16 , which is more convenient to operate than fixing with bolts.

[0036] Working principle: The temperature sensor detects the temperature of the environment in which the lithium battery unit 4 is located. When the temperature is higher than the optimal working temperature of the lithium battery, the electric telescopic rod drives the moving rod 12 to move, and drives the perforated plate 11 to rotate through the gear ring 13 and the rack 14, so that the holes of the perforated plate 11 are aligned with the perforated filter plate, and then the cooling fan 8 is started to accelerate the flow of air, so that the airflow enters through the air inlet 7, and flows through the heat dissipation fins 5 after being guided by the air guide block 9 for heat dissipation, and the hot air flows out from the vent 3. When the temperature is lower than the optimal working temperature of the lithium battery, the electric telescopic rod drives the moving rod 12 to move, and drives the perforated plate 11 to rotate through the gear ring 13 and the rack 14, so that the holes of the perforated plate 11 are misaligned with the perforated filter plate, the vent 3 and the air inlet 7 are closed, and the electric heating plate heats the space where the lithium battery unit 4 is located to prevent the lithium battery from discharging electricity due to low temperature. When the locking cam 17 is lowered, the locking cam 17 is lowered and the locking cam 17 is released, ...

[0037] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-cell lithium battery pack, comprising a housing (1), characterized in that: The top of the shell (1) is connected to a closing plate (2), the outer wall of the closing plate (2) is provided with a vent (3), the bottom of the shell (1) is provided with an air inlet (7), and a closing component (10) is provided on one side of the air inlet (7) and the vent (3). The inner wall of the shell (1) is divided into a plurality of cavities by a partition plate (6), the partition plate (6) is made of a heat-insulating material, a lithium battery unit (4) is placed inside the cavity, and a heat dissipation fin (5) is provided on the side wall of the lithium battery unit (4). The bottom of the partition plate (6) is connected to a plurality of air guide blocks (9), the number of the air guide blocks (9) corresponds to the number of the cavities, a heat dissipation fan (8) is provided between the air guide block (9) and the air inlet (7), and the inner walls of the vent (3) and the air inlet (7) are both provided with a filter plate with holes.

2. The multi-cell lithium battery pack according to claim 1, characterized in that: A temperature sensor is provided on one side of the lithium battery unit (4), a heating plate is provided on the side of the air guide block (9) adjacent to the lithium battery unit (4), and a control management module is provided inside the housing (1).

3. The multi-cell lithium battery pack according to claim 1, characterized in that: The closing assembly (10) located on one side of the air inlet (7) includes a moving rod (12) and a plurality of perforated plates (11), wherein the perforated plates (11) are rotatably connected to the housing (1), and the holes on the perforated plates (11) correspond to the perforated filter plates.

4. The multi-cell lithium battery pack according to claim 3, characterized in that: The moving rod (12) is slidably connected to the housing (1), one side of the moving rod (12) is connected to an electric telescopic rod, and a rack (14) is fixed to an outer wall of one side of the moving rod (12).

5. The multi-cell lithium battery pack according to claim 3, characterized in that: A toothed ring (13) is provided on the outer wall of the perforated plate (11), and the toothed ring (13) is in driving engagement with the rack (14).

6. The multi-cell lithium battery pack according to claim 1, characterized in that: The perforated plate (11) and the moving rod (12) in the closing assembly (10) located on one side of the vent (3) are connected to a frame arranged at the top end of the housing (1).

7. The multi-cell lithium battery pack according to claim 1, characterized in that: The closing plate (2) and the shell (1) are connected via a plurality of fixing components (15), wherein the fixing components (15) include a moving block (16) and a connecting hook (17). A groove is provided at one end of the shell (1), and the moving block (16) is slidably connected to the inner wall of the groove. The connecting hook (17) is fixed to both sides of the bottom end of the closing plate (2). The top end of the moving block (16) is rotatably connected to a connecting hook (19), and the connecting hook (17) and the connecting hook (19) are limitedly matched.

8. The multi-cell lithium battery pack according to claim 7, characterized in that: The side wall of the groove is provided with a limiting groove (20), and the side wall of the second connecting hook (19) is slidably matched with the limiting groove (20), and the limiting groove (20) is composed of a vertical groove and an arc groove at the top. The bottom end of the moving block (16) is connected by a spring (18), and the other end of the spring (18) is connected to the housing (1).

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