Low-voltage lithium battery starting power supply

Abstract

The present application relates to the technical field of starting power supply, and discloses a low-voltage lithium battery starting power supply, comprising a lower shell, an upper shell connected to the top of the lower shell, two pole columns connected to the upper shell, an external plug connected to the upper shell, and a circuit mechanism arranged on the lower shell. The low-voltage lithium battery starting power supply has a modular design of precise fixation of the battery cell protection plate and the BMS circuit board, uses the battery cell protection plate as the installation carrier of the busbar, shortens the current transmission path and reduces the loss, integrates the AFE and the CAN connector of the BMS circuit board to realize data acquisition and external communication, replaces the traditional sealing glue process to realize quick disassembly, maintenance and assembly, and uses the flexible deformation buffer to buffer the vehicle vibration, so that the connection is not broken due to stress concentration, and the system reliability is improved from the aspects of circuit topology and mechanical buffer.

Description

Technical Field

[0001] This invention relates to the field of starting power supply technology, specifically a low-voltage lithium battery starting power supply. Background Technology

[0002] A low-voltage lithium-ion battery starter is a portable power supply device designed specifically for low-voltage automotive starting systems, with a lithium-ion battery as the core energy storage unit. It is mainly used to provide starting current for automotive engines, and is especially suitable for emergency starting scenarios when traditional lead-acid batteries are depleted or malfunctioning.

[0003] In existing technologies, traditional jumper power supply connectors generally employ rigid wires or rigid connection structures. The inherent characteristic of these structures is a lack of flexibility, making them unable to adapt to the continuous vibrations, shocks, and temperature cycles present in the vehicle environment. During vehicle operation, engine vibrations and road bumps cause periodic mechanical stresses in the connectors. Rigid wires or rigid connections cannot buffer this stress through their own deformation, leading to continuous stress concentration at the connection points. Like a repeatedly bent wire inevitably breaking at the bending point, this long-term accumulation directly causes metal fatigue at the connection points, resulting in loose contacts or wire breakage. Simultaneously, temperature changes cause differential thermal expansion and contraction in connectors made of different materials. Rigid connection structures cannot accommodate these dimensional differences, creating gaps or additional stress at the connection interface. This disrupts the stability of the original conductive path, leading to increased contact resistance, signal transmission interruptions, and other problems. These defects directly reduce the reliability of the jumper power supply and may even lead to safety hazards such as vehicle starting failure or short circuits. Summary of the Invention

[0004] Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a low-voltage lithium battery starting power supply, which solves the problem that rigid wires or rigid connectors in existing technologies are prone to unreliable power connections and safety hazards due to metal fatigue or contact failure caused by a lack of flexible deformation capabilities.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a low-voltage lithium battery starting power supply, comprising: a lower housing; an upper housing connected to the top of the lower housing; terminals connected to the upper housing; an external connector connected to the upper housing; a circuit mechanism disposed on the lower housing; a cell holder disposed on the inner wall of the lower housing, on which cylindrical cells are placed and supported; and a heat dissipation mechanism disposed on the lower housing. The upper part is used for internal heat dissipation; the circuit mechanism includes a cell protection board, on which a BMS circuit board is connected, and on which several busbars are connected, and on which flexible flexible connectors are connected; the cell bracket is connected to the inner wall of the lower housing, and the cell bracket is provided with a positioning part for fixing the cell bracket to the lower housing with bolts; the inner wall of the cell bracket is provided with a cylindrical groove for positioning the cylindrical cell; the cell bracket is provided with a central support block for further positioning the side of the cylindrical cell.

[0008] Preferably, a plurality of reinforcing ribs are arranged in an array on the inner wall of the lower housing, and a mounting ring is fixedly connected to the bottom of the side wall of the lower housing for connection and fixation.

[0009] Preferably, the heat dissipation mechanism includes a hollow cylinder, which is fixedly connected to the inner wall of the lower housing. A drive motor is fixedly connected to the inner wall of the hollow cylinder, and a main shaft is fixedly connected to the output shaft of the drive motor. Fan blades are fixedly connected to the main shaft, and a filter element is fixedly connected to the inner wall of the hollow cylinder.

[0010] Preferably, a circular ring block is fixedly connected to the main shaft, an L-shaped rod is slidably connected to the main shaft, a spring is connected between the L-shaped rod and the circular ring block, one end of the spring is fixedly connected to the L-shaped rod, the other end of the spring is fixedly connected to the circular ring block, bristles are provided on the L-shaped rod facing the filter element, and a wave ring is connected to the inner wall of the hollow cylinder.

[0011] Preferably, a hollow tube is fixedly connected to the outer wall of the main shaft, and rigid rods are symmetrically slidably connected to the inner wall of the hollow tube. A second spring is provided between the rigid rod and the inner wall of the hollow tube. One end of the second spring is fixedly connected to the rigid rod, and the other end of the second spring is fixedly connected to the inner wall of the hollow tube. A semi-ring cover is fixedly connected to the rigid rod, and two semi-ring covers are symmetrically arranged outside the hollow tube.

[0012] Preferably, the mounting ring fixedly connected to the bottom side wall of the lower housing extends outward to form a flange structure, and the snap-fit ​​connection between the upper housing and the lower housing is provided with mutually cooperating L-shaped hooks and slots.

[0013] Preferably, the positioning part of the battery cell bracket is provided with a through bolt hole, and the inner wall of the bolt hole is provided with an annular protrusion. The battery cell bracket is bolted to the lower housing through the positioning parts at the four corners.

[0014] Preferably, one end of the pole is embedded inside the upper housing, and the other end extends to the outside of the upper housing to form a terminal block.

[0015] Preferably, an insulating gasket is provided between the battery cell protection board and the BMS circuit board, and a notch is provided on the busbar to avoid the explosion-proof valve of the cylindrical battery cell.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, the present invention provides a low-voltage lithium battery starting power supply, which has the following beneficial effects:

[0018] 1. This low-voltage lithium battery starting power supply adopts a modular design in which the cell protection board and the BMS circuit board are precisely fixed. By using the cell protection board as the mounting carrier of the bus, the current transmission path is shortened and the loss is reduced. The BMS circuit board integrates AFE and CAN connectors to realize data acquisition and external communication, replacing the traditional sealing process to achieve quick disassembly and maintenance. At the same time, the bending and folding structure of the flexible connecting bus uses flexible deformation to buffer vehicle vibration and avoid stress concentration leading to connector breakage. The system reliability is improved from both circuit topology and mechanical buffering aspects.

[0019] 2. This low-voltage lithium battery starting power supply innovatively adopts a three-point positioning system of positioning part, cylindrical groove and central support block for its cell bracket. The positioning part is rigidly connected to the lower shell by bolts to ensure overall stability. The cylindrical groove fits against the outer wall of the cell to restrict axial movement and circumferential rotation. The central support block forms radial support from the side. The three work together to form a physical limiting structure, so that the cylindrical cell can resist vehicle vibration and impact without sealing. This solves the problems of difficult disassembly and high cost of traditional sealing process and realizes modular fixing of the cell.

[0020] 3. This low-voltage lithium battery starting power supply integrates a dynamic cleaning and intelligent protection dual system in its heat dissipation mechanism. When the drive motor drives the main shaft to rotate, the L-shaped rod slides axially back and forth under the action of the wave ring and spring, so that the bristles sweep and clean the filter in all directions to prevent dust from clogging and affecting heat dissipation. At the same time, the rigid rod in the hollow tube overcomes the tension of the spring due to centrifugal force, which drives the semi-ring cover to open and close automatically, realizing open air intake during heat dissipation and closed protection when the machine stops. It can adapt to the working conditions without additional control components.

[0021] 4. This low-voltage lithium battery starting power supply has a housing connection system that increases the installation contact area through the flanged structure of the mounting ring on the lower housing. Combined with the L-shaped hook of the upper housing and the snap-fit ​​connection of the slot, it not only improves the overall fixing stability, but also achieves quick assembly and sealing protection. The busbar adopts aluminum busbars connected in series with cylindrical battery cells and has an explosion-proof valve clearance gap. While optimizing current transmission, it also reserves space for battery cell pressure relief. The multiple structural designs ensure the safe operation of the equipment in the complex environment of the vehicle.

[0022] 5. This low-voltage lithium battery starting power supply features a safety protection mechanism that runs through the circuit and structural design. The insulating gasket between the cell protection board and the BMS circuit board prevents short circuit risks. The BMS circuit board integrates charging and discharging control and safety protection functions to monitor the system status in real time. The flexible connection of the bending soft strip and the rigid fixation of the three-point positioning form a dynamic and static anti-vibration system. The automatic cleaning of the filter ensures unobstructed heat dissipation channels. It constructs all-round protection from three aspects: electrical safety, structural stability, and thermal management, meeting the high reliability requirements of low-voltage lithium battery starting power supplies. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the external connector of the present invention;

[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of the lower shell of the present invention;

[0026] Figure 4 This is a schematic diagram of the cross-section of the hollow cylinder in this invention;

[0027] Figure 5 This is a schematic diagram of the hollow tube structure in this invention;

[0028] Figure 6 This is a schematic diagram of the cross-sectional structure of the hollow tube portion in this invention;

[0029] Figure 7 This is a schematic diagram of the lower housing of the present invention;

[0030] Figure 8 This is a schematic diagram of the circuit mechanism structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of the flexible flexible connecting strip of the present invention;

[0032] Figure 10 This is a schematic diagram of the structure of the battery cell bracket of the present invention;

[0033] Figure 11 This is a schematic diagram of the cylindrical groove of the present invention.

[0034] In the diagram: 1. Lower housing; 11. Reinforcing rib; 12. Mounting ring; 2. Upper housing; 3. Heat dissipation mechanism; 31. Hollow cylinder; 32. Drive motor; 33. Main shaft; 34. Fan blade; 35. Filter element; 36. Circular ring block; 37. Spring one; 38. L-shaped rod; 39. Brush bristles; 310. Wave ring; 311. Hollow tube; 312. Spring two; 313. Rigid rod; 314. Semi-ring cover; 4. Terminal post; 5. External connector; 6. Circuit mechanism; 61. Cell protection board; 62. BMS circuit board; 63. Busbar; 64. Bending flexible connector; 7. Cell bracket; 71. Positioning part; 73. Cylindrical groove; 74. Central support block; 8. Cylindrical cell. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figures 1-11A low-voltage lithium battery starting power supply includes: a lower housing 1; an upper housing 2 connected to the top of the lower housing 1; two terminals 4 connected to the upper housing 2; an external connector 5 connected to the upper housing 2; a circuit mechanism 6 disposed on the lower housing 1; a cell support 7 disposed on the inner wall of the lower housing 1, on which a cylindrical cell 8 is placed and supported; and a heat dissipation mechanism 3 disposed on the lower housing 1. The upper part is used for internal heat dissipation; the circuit mechanism 6 includes a cell protection board 61, on which a BMS circuit board 62 is connected, and several busbars 63 are connected to the BMS circuit board 62. Flexible connecting strips 64 are connected to the busbars 63. In the circuit mechanism 6, the cell protection board 61 and the BMS circuit board 62 are precisely fixed, and the cell protection board 61 also serves as a mounting carrier for the busbars 63 to optimize the current path. The BMS circuit board 62 collects data and communicates with the outside via AFE and CAN connectors, integrating charging and discharging control and safety... Full protection function, replacing traditional sealing process to achieve modular disassembly and assembly; busbar 63 uses aluminum busbar to connect four cylindrical cells 8 in series, and connects to BMS circuit board 62 through external connector 5; the bending design of flexible connector 64 buffers vehicle vibration through flexible deformation, avoids stress concentration leading to connector breakage, and simplifies the installation process; cell bracket 7 is connected to the inner wall of lower housing 1, and the cell bracket 7 is provided with positioning part 71 for fixing the cell bracket 7 to lower housing 1 with bolts, and the inner wall of cell bracket 7... A cylindrical groove 73 is provided for positioning the cylindrical battery cell 8. A central support block 74 is provided on the battery cell bracket 7 for further positioning of the side of the cylindrical battery cell 8. The positioning part 71 is rigidly connected to the lower housing 1 by bolts to ensure the overall stability of the battery cell bracket 7. The inner wall of the cylindrical groove 73 fits against the outer wall of the cylindrical battery cell 8, restricting the axial movement and circumferential rotation of the battery cell. The central support block 74 forms radial support from the side of the battery cell, and together with the cylindrical groove 73, it forms a "three-point positioning" structure to offset the impact force under vehicle vibration. The synergistic effect of the three components allows the four cylindrical battery cells 8 to be firmly fixed by physical positioning without the need for sealing, which avoids the difficulties and costs of disassembly and assembly in traditional sealing processes.

[0037] Several reinforcing ribs 11 are arranged in an array on the inner wall of the lower housing 1, and a mounting ring 12 is fixedly connected to the bottom of the side wall of the lower housing 1 for connection and fixation.

[0038] The heat dissipation mechanism 3 includes a hollow cylinder 31, which is fixedly connected to the inner wall of the lower housing 1. A drive motor 32 is fixedly connected to the inner wall of the hollow cylinder 31, and a main shaft 33 is fixedly connected to the output shaft of the drive motor 32. Fan blades 34 are fixedly connected to the main shaft 33, and a filter element 35 is fixedly connected to the inner wall of the hollow cylinder 31. After the drive motor 32 starts, it drives the fan blades 34 to rotate through the main shaft 33, forming a directional airflow inside the hollow cylinder 31, accelerating the air circulation inside the equipment to achieve heat dissipation. The filter element 35 is fixed to the inner wall of the hollow cylinder 31 and can filter dust and impurities in the incoming airflow to prevent them from affecting the normal operation of the drive motor 32 and internal components. The overall structure is fixed to the inner wall of the lower housing 1 through the hollow cylinder 31, forming an independent heat dissipation air duct system.

[0039] A circular ring block 36 is fixedly connected to the main shaft 33, and an L-shaped rod 38 is slidably connected to the main shaft 33. A spring 37 is connected between the L-shaped rod 38 and the circular ring block 36. One end of the spring 37 is fixedly connected to the L-shaped rod 38, and the other end of the spring 37 is fixedly connected to the circular ring block 36. Brush bristles 39 are provided on the L-shaped rod 38, with the brush bristles 39 facing the filter element 35. A wave ring 310 is connected to the inner wall of the hollow cylinder 31. When the main shaft 33 rotates, the L-shaped rod 38 slidably connected to it rotates synchronously. During the rotation, the end of the L-shaped rod 38 contacts the wave ring 310 on the inner wall of the hollow cylinder 31. Because the surface of the wave ring 310 has a wavy structure with uneven surfaces, the L-shaped rod 38 will periodically reciprocate along the axis of the main shaft 33 when it rotates under the action of the spring 37. The protrusion of the wave ring 310 pushes the L-shaped rod 38 to compress the spring 37, and the spring 37 rebounds and resets at the concave part. The bristles 39 on the L-shaped rod 38 sweep and beat the surface of the filter element 35 in all directions as the L-shaped rod 38 rotates and slides axially. This can effectively remove attached dust, fibers and other blockages, and prevent the pores of the filter element 35 from being blocked by long-term accumulated impurities. The dynamic beating enhances the impurity removal ability.

[0040] A hollow tube 311 is fixedly connected to the outer wall of the main shaft 33. Rigid rods 313 are symmetrically slidably connected to the inner wall of the hollow tube 311. A second spring 312 is installed between the rigid rod 313 and the inner wall of the hollow tube 311. One end of the second spring 312 is fixedly connected to the rigid rod 313, and the other end is fixedly connected to the inner wall of the hollow tube 311. A semi-ring cover 314 is fixedly connected to the rigid rod 313. Two semi-ring covers 314 are symmetrically arranged outside the hollow tube 31. When the main shaft 33 rotates, the hollow tube 311 fixed to its outer wall rotates synchronously. At this time, the rigid rod 313, slidably connected inside the hollow tube 311, slides outward against the tension of the second spring 312 due to centrifugal force, causing the semi-ring cover 314 at the end of the rigid rod 313 to expand radially outward. Two symmetrical semi-ring covers 314 gradually open from a closed state, eventually exposing the air inlet outside the hollow cylinder 31. When the main shaft 33 stops rotating and the centrifugal force disappears, the rebound force of the second spring 312 pulls the rigid rod 313 back to the center of the hollow tube 311, and the semi-ring covers 314 close accordingly, covering the opening area outside the hollow cylinder 31 again, forming a physical barrier. No additional control components are needed; the opening and closing are automatically switched entirely by the rotation state of the main shaft 33, achieving intelligent adaptation of "open for heat dissipation, protected when stopped," simplifying the structure while improving reliability.

[0041] The mounting ring 12, which is fixedly connected to the bottom side wall of the lower housing 1, extends outward to form a flange structure. The snap-fit ​​connection between the upper housing 2 and the lower housing 1 is provided with mutually cooperating L-shaped hooks and slots. The flange structure of the mounting ring 12 of the lower housing 1 can increase the contact area with the external mounting surface to improve the fixing stability. The L-shaped hooks and slots of the upper housing 2 and the lower housing 1 cooperate to achieve quick snap-fit ​​assembly and ensure the sealing of the housing connection. The positioning part 71 of the cell bracket 7 is provided with a through bolt hole. The inner wall of the bolt hole is provided with an annular protrusion. The cell bracket 7 is bolted to the lower housing 1 through the positioning parts 71 at the four corners. The through bolt holes of the positioning part 71 of the cell bracket 7 are used to pass bolts through to achieve rigid fixation with the lower housing 1. The annular protrusion on the inner wall of the bolt hole can enhance the thread connection. To prevent loosening, the four-corner positioning part 71 connection design ensures that the cell bracket 7 is subjected to uniform force and avoids local deformation. One end of the pole post 4 is embedded inside the upper housing 2, and the other end extends to the outside of the upper housing 2 to form a terminal. The end of the pole post 4 embedded inside the upper housing 2 can be electrically connected to the internal circuit mechanism 6. The terminal extending to the outside facilitates the connection of external loads or charging equipment to realize power transmission. An insulating gasket is provided between the cell protection board 61 and the BMS circuit board 62. A notch is provided on the busbar 63 to avoid the explosion-proof valve of the cylindrical cell 8. The insulating gasket between the cell protection board 61 and the BMS circuit board 62 can prevent the two from contacting and short-circuiting. The notch on the busbar 63 provides a pressure relief space for the explosion-proof valve of the cylindrical cell 8 to avoid structural obstruction when the explosion-proof valve is opened.

[0042] In summary, this low-voltage lithium-ion battery starting power supply features a cell protection board 61 precisely fixed to the BMS circuit board 62 during use, while also serving as a mounting carrier for the busbar 63 to optimize the current path. The BMS circuit board 62 collects data and communicates with external systems via AFE and CAN connectors, integrating charge / discharge control and safety protection functions, and replacing traditional encapsulation processes to achieve modular assembly and disassembly. The busbar 63 uses an aluminum busbar to connect four cylindrical cells 8 in series, and connects to the BMS circuit board 62 via external connectors 5. The flexible flexible connector 64's bending design buffers vehicle vibration through flexible deformation, avoiding stress concentration that could lead to connector breakage, while also simplifying the installation process.

[0043] The positioning part 71 rigidly connects the cell bracket 7 to the lower housing 1 with bolts, ensuring the overall stability of the cell bracket 7. The inner wall of the cylindrical groove 73 fits against the outer wall of the cylindrical cell 8, restricting the axial movement and circumferential rotation of the cell. The central support block 74 forms radial support from the side of the cell, and together with the cylindrical groove 73, it forms a "three-point positioning" structure to offset the impact force under vehicle vibration. The synergistic effect of these three components allows the four cylindrical cells 8 to be firmly fixed by physical positioning without the need for sealing, avoiding the difficulties and costs associated with traditional sealing processes.

[0044] After the drive motor 32 starts, it drives the fan blades 34 to rotate via the main shaft 33, forming a directional airflow inside the hollow cylinder 31 to accelerate air circulation and achieve heat dissipation. The filter element 35 is fixed to the inner wall of the hollow cylinder 31 and can filter dust and impurities in the incoming airflow to prevent them from affecting the normal operation of the drive motor 32 and internal components. The overall structure is fixed to the inner wall of the lower housing 1 via the hollow cylinder 31, forming an independent heat dissipation air duct system. When the main shaft 33 rotates, the L-shaped rod 38 slidably connected to it rotates synchronously. During the rotation, the end of the L-shaped rod 38 contacts the corrugated ring 310 on the inner wall of the hollow cylinder 31. Because the surface of the wave ring 310 has an undulating wave-shaped structure, under the action of spring 37, the L-shaped rod 38 will periodically reciprocate along the axial direction of the main shaft 33 during rotation. The protrusions of the wave ring 310 push the L-shaped rod 38 to compress the spring 37, and the spring 37 rebounds and resets at the concave parts. The bristles 39 on the L-shaped rod 38, along with the rotation and axial sliding of the L-shaped rod 38, sweep and beat the surface of the filter element 35 in all directions, which can effectively remove attached dust, fibers and other blockages, and prevent the pores of the filter element 35 from being blocked by long-term accumulated impurities. The dynamic beating enhances the impurity removal ability. When the main shaft 33 rotates, the hollow tube 311 fixed on its outer wall rotates synchronously. At this time, the rigid rod 313, which is slidably connected in the hollow tube 311, slides outward against the tension of spring 312 due to centrifugal force, causing the semi-ring cap 314 at the end of the rigid rod 313 to expand radially outward. Two symmetrical semi-ring covers 314 gradually open from a closed state, eventually exposing the air inlet outside the hollow cylinder 31. When the main shaft 33 stops rotating and the centrifugal force disappears, the rebound force of the second spring 312 pulls the rigid rod 313 back to the center of the hollow tube 311, and the semi-ring covers 314 close accordingly, covering the opening area outside the hollow cylinder 31 again, forming a physical barrier. No additional control components are needed; the opening and closing are automatically switched entirely by the rotation state of the main shaft 33, achieving intelligent adaptation of "open for heat dissipation, protected when stopped," simplifying the structure while improving reliability.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A low-voltage lithium battery starting power supply, characterized in that: include: Lower housing (1); Upper housing (2), which is connected to the top of lower housing (1); Two pole posts (4) are connected to the upper housing (2); External connector (5), the upper housing (2) is connected to the external connector (5); Circuit mechanism (6), said circuit mechanism (6) is disposed on the lower housing (1); A cell bracket (7) is provided on the inner wall of the lower housing (1), and a cylindrical cell (8) is placed on the cell bracket (7). The cell bracket (7) is used to support the cylindrical cell (8). Heat dissipation mechanism (3), which is disposed on the lower housing (1) and is used to dissipate heat from the interior; The circuit mechanism (6) includes a cell protection board (61), a BMS circuit board (62) is connected to the cell protection board (61), a plurality of busbars (63) are connected to the BMS circuit board (62), and a flexible flexible busbar (64) is connected to the busbars (63). The cell bracket (7) is connected to the inner wall of the lower housing (1). The cell bracket (7) is provided with a positioning part (71) for fixing the cell bracket (7) and the lower housing (1) with bolts. A cylindrical groove (73) is provided on the inner wall of the cell bracket (7) for positioning the cylindrical cell (8). A middle support block (74) is provided on the cell bracket (7) for further positioning the side of the cylindrical cell (8). The heat dissipation mechanism (3) includes a hollow cylinder (31). The hollow cylinder (31) is fixedly connected to the inner wall of the lower housing (1). A drive motor (32) is fixedly connected to the inner wall of the hollow cylinder (31). The output shaft of the drive motor (32) is fixedly connected to a main shaft. 33), a fan blade (34) is fixedly connected to the main shaft (33), a filter element (35) is fixedly connected to the inner wall of the hollow cylinder (31), a ring block (36) is fixedly connected to the main shaft (33), an L-shaped rod (38) is slidably connected to the main shaft (33), a spring (37) is connected between the L-shaped rod (38) and the ring block (36), one end of the spring (37) is fixedly connected to the L-shaped rod (38), the other end of the spring (37) is fixedly connected to the ring block (36), bristles (39) are provided on the L-shaped rod (38), the bristles (39) face the filter element (35), and a wave ring (310) is connected to the inner wall of the hollow cylinder (31).

2. The low-voltage lithium battery starting power supply according to claim 1, characterized in that: The inner wall of the lower housing (1) is provided with a number of reinforcing ribs (11), and the bottom of the side wall of the lower housing (1) is fixedly connected with an installation ring (12), which is used for connection and fixation.

3. The low-voltage lithium battery starting power supply according to claim 2, characterized in that: A hollow tube (311) is fixedly connected to the outer wall of the main shaft (33). A rigid rod (313) is symmetrically slidably connected to the inner wall of the hollow tube (311). A spring (312) is provided between the rigid rod (313) and the inner wall of the hollow tube (311). One end of the spring (312) is fixedly connected to the rigid rod (313), and the other end of the spring (312) is fixedly connected to the inner wall of the hollow tube (311). A semi-ring cover (314) is fixedly connected to the rigid rod (313). The two semi-ring covers (314) are symmetrically arranged outside the hollow cylinder (31).

4. The low-voltage lithium battery starting power supply according to claim 1, characterized in that: The mounting ring (12) fixedly connected to the bottom side wall of the lower housing (1) extends outward to form a flange structure. The snap-fit ​​connection between the upper housing (2) and the lower housing (1) is provided with an L-shaped hook and a slot that cooperate with each other.

5. A low-voltage lithium battery starting power supply according to claim 1, characterized in that: The positioning part (71) of the battery cell bracket (7) is provided with a through bolt hole, and the inner wall of the bolt hole is provided with an annular protrusion. The battery cell bracket (7) is bolted to the lower housing (1) through the positioning parts (71) at the four corners.

6. A low-voltage lithium battery starting power supply according to claim 1, characterized in that: One end of the pole post (4) is embedded inside the upper housing (2), and the other end extends to the outside of the upper housing (2) to form a terminal block.

7. A low-voltage lithium battery starting power supply according to claim 1, characterized in that: An insulating pad is provided between the cell protection board (61) and the BMS circuit board (62), and a notch is provided on the busbar (63) to avoid the explosion-proof valve of the cylindrical cell (8).

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