Battery pack based on cylindrical lithium ion batteries

Abstract

The invention relates to the technical field of battery packs, in particular to a cylindrical lithium ion battery-based battery pack, which comprises a shell and a top plate mounted on the shell, two joints are arranged on the left side of the shell; the device further comprises a base. A base is fixedly connected in the shell; a plurality of circular grooves distributed in an array are formed in the base; a converter connected with the two connectors is installed in the shell, and the converter is connected with the two connectors. According to the battery pack based on the cylindrical lithium ion batteries obtained through the design, the top plate is manually detached from the shell by an operator, the cylindrical lithium batteries which are short-circuited, swelled or deteriorated in performance are accurately replaced, so that other operations are not needed, manual detachment is simple and rapid, the maintenance efficiency is improved, and the maintenance cost is reduced. And the cylindrical lithium battery with use value can be prevented from being discarded, the maintenance cost is reduced, and the waste of resources is reduced.

Description

Technical Field

[0001] This invention relates to the field of battery pack technology, and more specifically, to a battery pack based on cylindrical lithium-ion batteries. Background Technology

[0002] In the current selection of power batteries for electric vehicles, cylindrical lithium batteries have become the mainstream power supply solution for electric two-wheelers, three-wheelers, and some low-speed electric vehicles due to their significant advantages such as regular structure, high energy density, long cycle life, excellent cell consistency, and mature large-scale production technology. Their standardized shape facilitates modular integration and is beneficial for battery pack thermal management and automated assembly, thus leading to their widespread adoption.

[0003] However, in existing technologies, cylindrical lithium batteries are typically arranged in a dense array to form battery modules, and electrical connections and mechanical fixation are achieved through welding (such as laser welding and ultrasonic welding) or bolt fastening. While this rigid connection structure exhibits good electrical performance and structural stability during operation, it reveals significant drawbacks in battery pack maintenance or replacement: On the one hand, when individual cells need to be replaced due to aging, damage, or reaching the end of their service life, manual disassembly is extremely difficult due to the difficulty in removing the welded points without damage or the limited space of the bolts, resulting in time-consuming and inefficient maintenance; on the other hand, once a single cell in the module experiences a short circuit, bulge, or performance degradation, it is often impossible to replace the faulty cell alone, forcing the entire module or even the entire battery pack to be scrapped. This results in a large number of still usable cylindrical lithium batteries being discarded along with the battery, increasing user maintenance costs and seriously violating the sustainable development concepts of resource conservation and green recycling. Summary of the Invention

[0004] In order to overcome the shortcomings of existing battery packs, such as the difficulty in removing welded joints without damage or the limited space of bolts, which makes manual disassembly extremely difficult and leads to long maintenance time and low efficiency, this invention provides a battery pack based on cylindrical lithium-ion batteries.

[0005] The technical solution is as follows: A battery pack based on cylindrical lithium-ion batteries includes a shell and a top plate mounted on the shell; two connectors are provided on the left side of the shell; a base is also included; the base is fixedly connected inside the shell; the base has several circular grooves arranged in an array; a converter connected to the two connectors is installed inside the shell; a mounting plate is fixedly connected inside the shell; a partition is detachably connected between the converter and the mounting plate; the partition has several elliptical holes arranged in an array, and the elliptical holes are adapted to cylindrical lithium batteries; a cylindrical lithium battery is disposed in each circular groove and elliptical hole, and all cylindrical lithium batteries are arranged at an angle; an elliptical ring is disposed in each elliptical hole; a clamping component for limiting the cylindrical lithium batteries is connected to the top plate; a conductive component for transmitting current is connected to the base and the clamping component.

[0006] To further compress all the cylindrical lithium batteries, the clamping assembly includes fixing strips; two fixing strips are fixed to the lower surface of the top plate; two round rods are fixed to the opposing sides of the two fixing strips; support plates are slidably connected to the two round rods; and two springs in a compressed state are fixed between the support plates and the fixing strips.

[0007] To connect all the cylindrical lithium batteries, the conductive component further includes conductive strips; a conductive strip located above the fixing strip is embedded on the lower surface of the top plate; several conductive plates are fixedly connected to the support plate, and the upper part of all conductive plates is electrically connected to the conductive strip, while all conductive plates are in contact with all the cylindrical lithium batteries; a through groove communicating with all the circular grooves is opened on the base; a connecting piece is fixedly connected in the through groove; several conductive posts are arranged in an array on the connecting piece, and each conductive post is in contact with one cylindrical lithium battery.

[0008] To allow for connection with the outside air, a sealing plate is further included; a flow groove communicating with the inner wall of the shell is provided on the left and right sides of the shell; a sealing plate is connected to each flow groove by a damping sliding connection; and two grooves are provided on each sealing plate in a symmetrical arrangement.

[0009] To prevent dust from entering the housing, a filter cotton is further included; a filter cotton is fixed to the underside of each sealing plate and is located in the flow channel.

[0010] Furthermore, the filter cotton is designed to be folded.

[0011] The above settings facilitate the gathering of the filter cotton.

[0012] To further improve heat dissipation efficiency, the device also includes a fixing plate; the fixing plate is fixedly connected to the inner right wall of the casing; three fans are mounted on the fixing plate; a horizontal plate is fixedly connected to the left side of the right sealing plate, and the horizontal plate is in contact with the right side of the fixing plate.

[0013] Furthermore, the partition is made of heat-insulating material.

[0014] The above settings achieve the effect of heat insulation.

[0015] Furthermore, the elliptical ring is made of rubber.

[0016] The above settings achieve the effect of protecting cylindrical lithium batteries.

[0017] To remove dust adhering to the filter cotton, a second fixing plate is further included; the second fixing plate is fixedly connected to the left side of the base; several fans are embedded in the second fixing plate in an equidistant arrangement; an inclined plate is fixedly connected to the right side of the left sealing plate, and the inclined plate is in contact with the left side of the second fixing plate.

[0018] The beneficial effects of the present invention are as follows: The battery pack based on cylindrical lithium-ion batteries obtained by the present invention allows operators to manually remove the top plate from the outer shell and accurately replace the short-circuited, bulging, or degraded cylindrical lithium batteries without the need for other operations. Manual disassembly is simple and quick, improving maintenance efficiency. It also prevents usable cylindrical lithium batteries from being discarded along with the batteries, reducing maintenance costs and minimizing resource waste.

[0019] The battery pack based on cylindrical lithium-ion batteries obtained by the present invention, compared with the vertically arranged cylindrical lithium batteries, not only does not affect the replacement of cylindrical lithium batteries, but also reduces the phenomenon of reciprocating vibration and displacement of cylindrical lithium batteries. Furthermore, the elliptical ring tightly attached to the outer ring surface of the cylindrical lithium battery restricts the cylindrical lithium battery and plays a buffering role, preventing the separator from scratching the outer surface of the cylindrical lithium battery.

[0020] The battery pack based on cylindrical lithium-ion batteries obtained by the present invention uses a fan to continuously draw outside air into the outer shell and then continuously deliver it to the left side of the outer shell. The airflow carries the heat out of the outer shell, accelerating the heat dissipation efficiency of the battery pack. During the heat dissipation process, dust in the air will enter the outer shell. At this time, two unfolded filter cottons filter the dust in the air, preventing a large amount of dust from entering the outer shell and affecting the service life and performance of the battery pack.

[0021] The battery pack based on cylindrical lithium-ion batteries obtained by the above design can achieve the effect of self-cleaning of two filter cottons by alternating operation of fan one and fan two. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the battery pack based on a cylindrical lithium-ion battery according to the present invention; Figure 2 This is a three-dimensional structural diagram of the battery pack based on cylindrical lithium-ion batteries of the present invention, including the outer shell, base, converter, mounting plate, separator, and cylindrical lithium battery. Figure 3 This is a three-dimensional structural diagram of the separator, cylindrical lithium battery, and elliptical ring of the battery pack based on the cylindrical lithium-ion battery of the present invention. Figure 4 This is a three-dimensional structural diagram of the clamping component and conductive component of the battery pack based on a cylindrical lithium-ion battery according to the present invention. Figure 5 This is a three-dimensional structural diagram of the base, connecting piece, and conductive post of the battery pack based on a cylindrical lithium-ion battery according to the present invention. Figure 6This is a three-dimensional structural diagram of the battery pack based on a cylindrical lithium-ion battery of the present invention, including the outer shell, sealing plate, filter cotton, fixing plate 1, fan 1, and horizontal plate. Figure 7 This is a three-dimensional structural diagram of the fixing plate 2, fan 2, and inclined plate of the battery pack based on cylindrical lithium-ion batteries according to the present invention.

[0023] Reference numerals: 1-Outer shell, 2-Top plate, 3-Base, 4-Converter, 5-Mounting plate, 6-Separator, 7-Cylindrical lithium battery, 8-Oval ring, 101-Fixing strip, 102-Round rod, 103-Support plate, 104-Spring, 105-Conductive strip, 106-Conductive sheet, 107-Connecting piece, 108-Conductive column, 201-Sealing plate, 202-Filter cotton, 203-Fixing plate one, 204-Fan one, 205-Horizontal plate, 206-Fixing plate two, 207-Fan two, 208-Slanted plate, 1001-Connector, 1002-Flow channel, 2001-Handle, 3001-Round groove, 3002-Through groove, 6001-Oval hole, 20101-Groove. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings.

[0025] Example 1: A battery pack based on cylindrical lithium-ion batteries, such as... Figures 1-6 As shown, it includes an outer shell 1 and a top plate 2; the top plate 2 is detachably connected to the outer shell 1; two connectors 1001 are provided on the left side of the outer shell 1; It also includes a base 3, a converter 4, a mounting plate 5, a partition 6, a cylindrical lithium battery 7, an elliptical ring 8, a clamping assembly, and a conductive assembly; the base 3 is fixedly connected to the inner bottom wall of the outer casing 1; the base 3 has several circular grooves 3001 arranged in an array; the converter 4 is installed on the inner left wall of the outer casing 1, and the converter 4 is connected to two connectors 1001; the mounting plate 5 is fixedly connected to the inner right wall of the outer casing 1; the partition 6 is detachably connected between the converter 4 and the mounting plate 5; the partition 6 has several elliptical holes 6001 arranged in an array, and the elliptical holes 6001 are adapted to the cylindrical lithium battery 7; each circular groove 3001 and elliptical hole 6001 is provided with a cylindrical lithium battery 7, and all cylindrical lithium batteries 7 are inclined; each elliptical hole 6001 is provided with an elliptical ring 8; a clamping assembly is connected to the top plate 2; and a conductive assembly is connected to the base 3 and the clamping assembly.

[0026] The clamping assembly includes a fixing strip 101, a round rod 102, a support plate 103, and a spring 104; two fixing strips 101 are fixedly connected to the lower surface of the top plate 2; two round rods 102 are fixedly connected to the opposing sides of the two fixing strips 101; the support plate 103 is slidably connected to the two round rods 102; two springs 104 are fixedly connected between the support plate 103 and the fixing strips 101, and the two springs 104 are in a compressed state.

[0027] The conductive component includes a conductive strip 105, a conductive sheet 106, a connecting piece 107, and a conductive post 108; the conductive strip 105 is embedded on the lower surface of the top plate 2, and the conductive strip 105 is located above the fixing strip 101; several conductive sheets 106 are fixedly connected to the support plate 103, and the upper part of all conductive sheets 106 is electrically connected to the conductive strip 105. At the same time, all conductive sheets 106 are in contact with all cylindrical lithium batteries 7; a through groove 3002 is provided on the base 3, and the through groove 3002 is connected to all circular grooves 3001; a connecting piece 107 is fixedly connected in the through groove 3002; several conductive posts 108 are arranged in an array on the connecting piece 107, and each conductive post 108 is in contact with one cylindrical lithium battery 7.

[0028] It also includes a sealing plate 201; a flow groove 1002 is provided on the left and right sides of the outer shell 1, and the flow groove 1002 is connected to the inner wall of the outer shell 1; a sealing plate 201 is connected in a damped sliding manner in each flow groove 1002; two grooves 20101 are provided on each sealing plate 201, and the two grooves 20101 are symmetrically distributed vertically.

[0029] It also includes filter cotton 202; each sealing plate 201 has a filter cotton 202 fixedly attached to its lower side, and the filter cotton 202 is located in the flow channel 1002.

[0030] Furthermore, the filter cotton 202 is configured to be folded.

[0031] The further advantage of adopting the above method is that it makes it easier for operators to collect the filter cotton 202.

[0032] It also includes a fixing plate 203, a fan 204 and a horizontal plate 205; the fixing plate 203 is fixedly connected to the inner right wall of the outer casing 1, and the fixing plate 203 is located to the right of the cylindrical lithium battery 7; three fans 204 are installed on the fixing plate 203; the horizontal plate 205 is fixedly connected to the left side of the right sealing plate 201, and the horizontal plate 205 is in contact with the right side of the fixing plate 203.

[0033] Furthermore, the partition 6 is made of heat insulation material.

[0034] Furthermore, the elliptical ring 8 is made of rubber.

[0035] The working steps of this embodiment are as follows: The following directions are Figure 1 Using the reference point of the viewpoint, the direction where the outer shell 1 is located is the front. The rotations described below refer to viewpoints from front to back, from top to bottom, and from right to left. When the operator needs to replace the cylindrical lithium battery 7 inside the casing 1, the top plate 2 is manually removed from the casing 1, which moves the clamping assembly, conductive strip 105, and conductive sheet 106 out of the casing 1, so that the conductive sheet 106 no longer presses down on all the cylindrical lithium batteries 7. Then the operator removes all the cylindrical lithium batteries 7 from the separator 6 and replaces them with new cylindrical lithium batteries 7. In addition, when a single cylindrical lithium battery 7 is short-circuited, bulging, or degraded, it can also be accurately replaced without any other operations. Manual disassembly is simple and quick, improving maintenance efficiency and preventing usable cylindrical lithium batteries 7 from being discarded along with the battery, reducing maintenance costs and minimizing resource waste.

[0036] Because electric vehicles experience bumps and vibrations during riding, the cylindrical lithium batteries 7 inside the battery pack may vibrate and shift. Therefore, all the cylindrical lithium batteries 7 are tilted, and the vibration and shift of the cylindrical lithium batteries 7 are limited by the partition 6. At the same time, the elastic force of the two springs 104 forces the support plate 103 and several conductive plates 106 to adhere tightly to the upper ends of several cylindrical lithium batteries 7, fixing all the cylindrical lithium batteries 7 inside the outer casing 1 and preventing the cylindrical lithium batteries 7 from detaching from the conductive plates 106, which would affect the normal use of the lithium batteries. Furthermore, the tilted cylindrical lithium batteries 7 also facilitate airflow. Thus, compared to the vertically arranged cylindrical lithium batteries 7, the tilted arrangement of the cylindrical lithium batteries 7 not only does not affect the replacement of the cylindrical lithium batteries 7, but also reduces the reciprocating vibration and shift of the cylindrical lithium batteries 7.

[0037] It should be noted that when the cylindrical lithium battery 7 moves up and down, the elliptical ring 8 is tightly attached to the outer ring surface of the cylindrical lithium battery 7 to restrict the cylindrical lithium battery 7 and play a buffering role, preventing the separator 6 from scratching the outer surface of the cylindrical lithium battery 7.

[0038] When the battery pack is charging, if a large amount of heat is generated inside and cannot be quickly dissipated from the outer casing 1, the operator reaches into the groove 20101 of the right sealing plate 201 and pushes the right sealing plate 201 and the horizontal plate 205 upwards together. The horizontal plate 205 is moved above the fan 204, and the filter cotton 202 below is pulled upwards. At this time, the fixing plate 203 and the horizontal plate 205 separately isolate a portion of the space inside the outer casing 1, and this portion of the space is connected to the outside air through the right flow channel 1002. Then, the left... The sealing plate 201 on the square moves upward, opening the flow channel 1002 on the left. Then, the three fans 204 are controlled to rotate in the forward direction, drawing outside air into the housing 1 and continuously supplying it to the left side of the housing 1. The airflow carries the heat out of the housing 1, accelerating the heat dissipation efficiency of the battery pack. During the heat dissipation process, dust in the air will enter the housing 1. At this time, the two unfolded filter cotton 202 filters the dust in the air, preventing a large amount of dust from entering the housing 1 and affecting the service life and performance of the battery pack.

[0039] When the battery pack is discharging and the two sealing plates 201 on the outer casing 1 are not open, control the three fans 204 to rotate forward, continuously transport the gas on the right side of the outer casing 1 to the left, so that the gas inside the outer casing 1 circulates internally, accelerating the dissipation of heat inside the battery pack.

[0040] It should be noted that conductive lines are provided inside the outer casing 1 and the top plate 2, and these conductive lines are used to connect the converter 4, the conductive strip 105, and the connecting piece 107 in series.

[0041] It should be noted that the space inside the housing 1 is divided into an upper space and a lower space by the converter 4, mounting plate 5, partition 6 and elliptical ring 8. This prevents the airflow generated by the fan 204 from entering the upper space, which would allow dust to enter the gap between the cylindrical lithium battery 7 and the conductive sheet 106, causing electrical short circuits, increased resistance and oxidation.

[0042] Example 2: Based on Example 1, such as Figure 7 As shown, it also includes a second fixing plate 206, a second fan 207, and an inclined plate 208; the second fixing plate 206 is fixedly connected to the left side of the base 3; three fans 207 are embedded in the second fixing plate 206 and are distributed at equal intervals; the inclined plate 208 is fixedly connected to the right side of the left sealing plate 201, and the inclined plate 208 is in contact with the left side of the second fixing plate 206.

[0043] A handle 2001 is provided on the top plate 2 to facilitate the operator to carry the battery pack.

[0044] The working principle of this embodiment is as follows: Because a large amount of dust adheres to the outside air, and when outside air passes through the right filter cotton 202 and enters the housing 1, the dust in the air will adhere to the right filter cotton 202. As the working time increases, a large amount of dust will accumulate on the right filter cotton 202, causing the filter pores on the filter cotton 202 to become clogged, affecting the normal airflow. Therefore, after the three fans 204 have been working for a period of time, the three fans 204 are controlled to be turned off. At this time, because the two sealing plates 201 are in the open state, the inclined plate 208 connected to the left sealing plate 201 also moves along with the sealing plate 201 when the sealing plate 201 is opened, so that the inclined plate 208 is located in the three The upper left of fan 207 is located, while fixed plate 206 and inclined plate 208 also separately partition a part of the space inside the outer casing 1. This part of the space is connected to the outside air through the left flow channel 1002. By controlling the three fans 207 to reverse, the outside air is drawn into the outer casing 1, forming an airflow that continuously delivers air to the right side of the outer casing 1. The airflow carries the heat inside the outer casing 1, passes through the right filter cotton 202 and is discharged from the outer casing 1. At the same time, the dust attached to the right filter cotton 202 is blown away. In this way, by the alternating operation of fan 1 204 and fan 207, the two filter cottons 202 can achieve a self-cleaning effect.

[0045] It should be noted that the fan 204 and fan 207 inside the casing 1 can be turned on simultaneously. When fan 204 rotates forward, fan 207 is controlled to rotate in reverse to accelerate the extraction of gas from the casing 1, thereby improving the heat dissipation efficiency of the battery pack.

[0046] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims should be given the broadest interpretation so as to cover all variations and equivalent structures and functions.

Claims

1. A cylindrical lithium-ion battery-based battery pack, comprising a shell (1) and a top plate (2) mounted on the shell (1); the left side of the shell (1) is provided with two connectors (1001); characterized in that, It also includes a base (3); the base (3) is fixedly connected inside the outer shell (1); the base (3) has a number of circular grooves (3001) arranged in an array; the outer shell (1) is equipped with a converter (4) connected to two connectors (1001), and the converter (4) is connected to the two connectors (1001); the outer shell (1) is fixedly connected with a mounting plate (5); a partition (6) is detachably connected between the converter (4) and the mounting plate (5); the partition (6) has a number of elliptical grooves arranged in an array. A circular hole (6001) and an elliptical hole (6001) are adapted to a cylindrical lithium battery (7); a cylindrical lithium battery (7) is provided in each circular groove (3001) and elliptical hole (6001), and all cylindrical lithium batteries (7) are inclined; an elliptical ring (8) is provided in each elliptical hole (6001); a clamping assembly for limiting the cylindrical lithium battery (7) is connected to the top plate (2); a conductive assembly for transmitting current is connected to the base (3) and the clamping assembly.

2. The cylindrical lithium-ion battery-based battery pack of claim 1, wherein, The clamping assembly includes a fixing strip (101); two fixing strips (101) are fixed to the lower surface of the top plate (2); two round rods (102) are fixed to the opposing sides of the two fixing strips (101); a support plate (103) is slidably connected to the two round rods (102); and two springs (104) in a compressed state are fixed between the support plate (103) and the fixing strip (101).

3. A battery pack based on a cylindrical lithium-ion battery according to claim 2, characterized in that, The conductive component includes a conductive strip (105); the lower surface of the top plate (2) is embedded with a conductive strip (105) located on the upper side of the fixing strip (101); a number of conductive pieces (106) are fixedly connected to the support plate (103), and the upper part of all conductive pieces (106) is electrically connected to the conductive strip (105). At the same time, all conductive pieces (106) are in contact with all cylindrical lithium batteries (7); a through groove (3002) is opened on the base (3) and communicates with all the circular grooves (3001); a connecting piece (107) is fixedly connected in the through groove (3002); a number of conductive posts (108) arranged in an array are provided on the connecting piece (107), and each conductive post (108) is in contact with a cylindrical lithium battery (7).

4. A battery pack based on a cylindrical lithium-ion battery according to claim 1, characterized in that, It also includes a sealing plate (201); a flow groove (1002) communicating with the inner wall of the outer shell (1) is provided on the left and right sides of the outer shell (1); a sealing plate (201) is provided in each flow groove (1002) with damping sliding connection; and two grooves (20101) are provided on each sealing plate (201) in a symmetrical arrangement.

5. A battery pack based on a cylindrical lithium-ion battery according to claim 4, characterized in that, It also includes filter cotton (202); each sealing plate (201) has a filter cotton (202) fixed to its lower side, and the filter cotton (202) is located in the flow channel (1002).

6. A battery pack based on a cylindrical lithium-ion battery according to claim 5, characterized in that, The filter cotton (202) is folded.

7. A battery pack based on a cylindrical lithium-ion battery according to claim 6, characterized in that, It also includes a fixing plate 1 (203); the fixing plate 1 (203) is fixed to the inner right wall of the outer shell (1); three fans 1 (204) are installed on the fixing plate 1 (203); a horizontal plate (205) is fixed to the left side of the right sealing plate (201), and the horizontal plate (205) is in contact with the right side of the fixing plate 1 (203).

8. A battery pack based on a cylindrical lithium-ion battery according to claim 1, characterized in that, The partition (6) is made of heat insulation material.

9. A battery pack based on a cylindrical lithium-ion battery according to claim 1, characterized in that, The elliptical ring (8) is made of rubber.

10. A battery pack based on a cylindrical lithium-ion battery according to claim 7, characterized in that, It also includes a second fixing plate (206); the second fixing plate (206) is fixedly connected to the left side of the base (3); a number of fans (207) are embedded in the second fixing plate (206) and are evenly distributed; a sloping plate (208) is fixedly connected to the right side of the left sealing plate (201), and the sloping plate (208) is in contact with the left side of the second fixing plate (206).

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