Active rapid equalizer for low-cost lithium battery

Abstract

The invention relates to the technical field of lithium battery equalizers, in particular to a low-cost lithium battery active rapid equalizer. The device comprises a protection mechanism, the protection mechanism comprises a shell, a top cover is arranged at the top of the shell, ventilation grooves are formed in the outer sides of a pair of side walls, away from each other, of the shell, and a heating part is arranged in the shell; temperature sensing mechanisms are arranged at the joints of the shell and the two ventilation grooves, each temperature sensing mechanism at least comprises a baffle arranged on the outer side of the shell, and heat dissipation mechanisms are arranged on the sides, away from the temperature sensing mechanisms, of the two ventilation grooves; according to the low-cost active rapid equalizer for the lithium battery, the stability of the field angle of the baffle can be ensured while heat dissipation is performed through the arranged heat dissipation mechanism. After the baffle is jacked open by the expansion air bag with the expanded volume, the driving piece drives the fan coaxially connected with the output shaft of the driving piece to rotate, and excessive heat in the shell is taken away from the periphery of the heating part; the baffle can be stably kept at the current elevation angle through suction force generated in the ventilation grooves.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery equalizers, and in particular to a low-cost active fast equalizer for lithium batteries. Background Art

[0002] The role of a lithium battery balancer is to use power electronics technology to keep the voltage deviation of a lithium-ion battery cell or battery pack within the expected range, thereby ensuring that each cell remains in the same state during normal use to avoid overcharging or over-discharging. Existing lithium battery balancers face many challenges in terms of heat dissipation under different working environments.

[0003] When the lithium battery balancer is used in an environment with a high ambient temperature, if the heat generated by the heating components inside the balancer is not dissipated in time, it will affect the voltage stabilization function of the balancer. The common treatment method is to set ventilation and heat dissipation components on the shell of the balancer. If it is set in an open form, although the heat dissipation effect is guaranteed, there will be the following defects: on the one hand, the open design makes it easy for dust to enter the inside of the balancer, especially in a humid working environment, water vapor entering the inside of the balancer will also reduce its service life; on the other hand, if the balancer is used in a low temperature environment, the open design will prevent the heat generated by the balancer from accumulating, and the working environment with too low temperature will also affect the voltage stabilization effect of the balancer on the lithium battery. If an intelligent control module is introduced, the balancer can automatically adjust the opening and closing of the heat dissipation mechanism at different working temperatures. Although the defects of the above-mentioned open design have been solved, new problems have also been brought about: First, the intelligent control module has high requirements for the working environment. For high and low temperature working environments with large temperature differences, it is necessary to set up additional supporting circuits and protection mechanisms for the intelligent control module. In addition, the intelligent control module also needs to consider the electromagnetic interference problem of the military equalizer itself during use. There are many difficulties to overcome in installing and using this type of high-precision electronic integrated components, which does not meet the low-cost requirements of the lithium battery equalizer. In addition, the temperature sensor takes a certain amount of time to detect temperature changes and transmit the signal to the control system, and then the control system controls the opening and closing of the baffle. There may be a certain delay in this process, resulting in a slow response speed. Moreover, when the temperature inside the equalizer rises, the intelligent control module cannot speed up the heat dissipation rate inside the shell without increasing the output power of the heat dissipation mechanism.

[0004] In view of this, we propose a low-cost active fast equalizer for lithium batteries to improve the shortcomings of the existing technology. Summary of the invention

[0005] The object of the present invention is to provide a low-cost active fast equalizer for lithium batteries to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides a low-cost active fast equalizer for lithium batteries, including a protection mechanism, the protection mechanism including a shell, a top cover is provided on the top of the shell, ventilation slots are provided on the outer sides of a pair of side walls away from the shell, and a heat generating component is provided in the shell;

[0007] Wherein, a temperature sensing mechanism is provided at the interface between the shell and the two ventilation slots, the temperature sensing mechanism at least comprises a baffle arranged on the outside of the shell, and the two ventilation slots are provided with a heat dissipation mechanism on the side away from the temperature sensing mechanism, the temperature sensing mechanism is used to control the connection state between the shell and the outside at different temperatures, and the heat dissipation mechanism is used to accelerate the speed of heat loss inside the shell;

[0008] When the shell is in a high temperature environment, the baffle opens the ventilation slots, and the temperature sensing mechanism can accelerate the circulation rate of hot air inside the shell, and the heat dissipation mechanism can ensure the stability of the baffle opening angle. When the shell is in a low temperature environment, the baffle closes the ventilation slots.

[0009] As a further improvement of the present technical solution, the protection mechanism also includes a pair of extension frames arranged on the side of the two shells away from the ventilation slots, the extension frames are spaced apart from the inner side walls of the shells, and the protection mechanism also includes a placement seat arranged at the interface between the shells and the two ventilation slots.

[0010] As a further improvement of the present technical solution, the temperature sensing mechanism also includes a temperature sensing airbag arranged on the side of the extension frame away from the ventilation slot, and the temperature sensing mechanism also includes an expansion airbag arranged on the side of the placement seat close to the ventilation slot, and a number of ventilation pipes are connected between the temperature sensing airbag and the expansion airbag.

[0011] As a further improvement of the technical solution, the baffle is arranged on a side of the expansion airbag away from the shell, and the top of the expansion airbag is rotatably connected to the inner wall of the ventilation groove.

[0012] As a further improvement of the technical solution, the expansion coefficient of the lower part of the expansion airbag is greater than the expansion coefficient of the upper part of the expansion airbag.

[0013] As a further improvement of the present technical solution, the heat dissipation mechanism includes a limit frame arranged at one end of the ventilation slot away from the shell, the outer wall of the limit frame is in close contact with the inner wall of the ventilation slot notch, a fan is arranged in the limit frame, a driving member is arranged on the side of the fan close to the shell, and the fan is coaxially connected to the output shaft of the driving member.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In the low-cost lithium battery active fast equalizer, the baffle is opened at high temperature by the temperature sensing mechanism, and can be closed at low temperature when heat dissipation is not required. Specifically, when the equalizer works in a high temperature environment, the gas filled in the temperature-sensing airbag expands due to heat, and the volume of the gas in the expanded airbag also increases due to heat, thereby pushing open the baffle originally sealed on the outside of the placement seat, and the temperature-sensing airbag that expands due to heat expands toward one side of the heat-generating component. On the premise of ensuring that the air inside the shell and the outside can circulate, the volume expansion of the temperature-sensing airbag occupies a part of the original gas circulation space, so that the rate at which the hot air inside the shell flows from the ventilation slot to the outside is accelerated; when the equalizer works in a low temperature environment, the gas in the expanded airbag shrinks in volume when it is cold, and the expanded airbag returns to its original shrunk state. After losing the support of the expansion force of the expanded airbag, the baffle is reset under the action of its own gravity, thereby being close to the placement seat, reducing the heat loss inside the shell, and preventing external dust, water vapor and other substances from entering the shell.

[0016] 2. In this low-cost lithium battery active fast equalizer, the heat dissipation mechanism can ensure the stability of the baffle angle while dissipating heat. Specifically, after the baffle is pushed open by the expanded airbag, the driver drives the fan coaxially connected to its own output shaft to rotate. On the one hand, the excess heat inside the shell is drawn away from the heat-generating components; on the other hand, the suction force generated in the ventilation slot enables the baffle to be stably maintained at the current elevation angle, ensuring that the heat can be stably dissipated from the opening of the baffle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a partial cutaway schematic diagram of the present invention;

[0019] Figure 3 It is a cutaway view of the protection mechanism of the present invention;

[0020] Figure 4 The heat flow diagram inside the protection mechanism of the present invention;

[0021] Figure 5 It is a cutaway view of the temperature sensing mechanism of the present invention;

[0022] Figure 6 It is a cutaway front view of the heat dissipation mechanism of the present invention.

[0023] The meaning of each number in the figure is:

[0024] 10. Protective mechanism; 11. Shell; 12. Top cover; 13. Ventilation slot; 14. Heating component; 15. Extension frame; 16. Placement seat;

[0025] 20. Temperature sensing mechanism; 21. Temperature sensing airbag; 22. Inflatable airbag; 23. Ventilation pipe; 24. Baffle;

[0026] 30. Heat dissipation mechanism; 31. Limiting frame; 32. Fan; 33. Driving part. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] See also Figure 1-Figure 2 As shown, the purpose of this embodiment is to provide a low-cost active fast equalizer for lithium batteries, including a protection mechanism 10, the protection mechanism 10 includes a shell 11, a top cover 12 is provided on the top of the shell 11, a pair of side walls away from the shell 11 are provided with ventilation grooves 13 on the outside, and a heat generating component 14 is provided in the shell 11;

[0030] Among them, a temperature sensing mechanism 20 is provided at the interface between the shell 11 and the two ventilation slots 13, and the temperature sensing mechanism 20 at least includes a baffle 24 arranged on the outside of the shell 11. The two ventilation slots 13 are provided with a heat dissipation mechanism 30 on the side away from the temperature sensing mechanism 20. The temperature sensing mechanism 20 is used to control the connection state between the shell 11 and the outside at different temperatures, and the heat dissipation mechanism 30 is used to accelerate the speed of heat dissipation inside the shell 11;

[0031] When the housing 11 is in a high temperature environment, the baffle 24 opens the ventilation slot 13 to connect the interior of the housing 11 with the external environment, and the temperature sensing mechanism 20 can accelerate the circulation rate of hot air inside the housing 11, while the heat dissipation mechanism 30 can ensure the stability of the opening angle of the baffle 24 while accelerating the speed of heat dissipation inside the housing 11. When the housing 11 is in a low temperature environment, the baffle 24 closes the ventilation slot 13 to prevent the temperature inside the housing 11 from being too low, and can also prevent external dust and other substances from entering the interior of the housing 11 to affect the stability of the voltage stabilization function of the equalizer;

[0032] In the existing lithium battery balancer, the devices that easily generate heat during operation (i.e., the heat generating components 14) mainly include: power semiconductor devices, inductance elements, resistance elements, and integrated circuit chips. These are the electronic components that are more likely to generate heat in the existing mainstream lithium battery balancer, and no special explanation is given here.

[0033] Working principle: When the temperature of the external environment is high, the heat generated by the heat-generating component 14 is difficult to dissipate in time through natural convection and radiation. The heat accumulates in the shell 11 to a certain extent, and the temperature sensing mechanism 20 senses the temperature change inside the shell 11, thereby increasing its volume to push the baffle 24 upward, so that the inside of the shell 11 is connected to the outside world, and at the same time, the power supply of the heat dissipation mechanism 30 is turned on to speed up the speed at which the heat inside the shell 11 is dissipated to the outside world. At the same time, the suction force generated by the heat dissipation mechanism 30 when it is working ensures the stability of the opening angle of the baffle 24, thereby ensuring the stability of the heat dissipation from the opening of the baffle 24;

[0034] When the external ambient temperature is low, the temperature sensing mechanism 20 also senses the change in the temperature inside the shell 11, thereby shrinking in volume. At this time, there is no longer a need for heat dissipation inside the shell 11, and the power supply of the heat dissipation mechanism 30 is turned off. The baffle 24 loses the supporting force brought by the volume expansion of the temperature sensing mechanism 20, and gradually closes the ventilation slot 13 under its own action, thereby ensuring the sealing between the inside of the shell 11 and the outside world, preventing the heat generated by the heat-generating component 14 from being excessively dissipated, thereby affecting the voltage stabilizing function of the equalizer for the lithium battery.

[0035] When the equalizer works in a high temperature environment, the volume of the temperature sensing mechanism 20 expands. If the ventilation slot 13 is blocked, the heat dissipation effect of the heat generating component 14 will be affected, thereby affecting the voltage stabilization function of the equalizer for the lithium battery. Therefore, a special position limit is made for the position of the temperature sensing mechanism 20, so that it can sense the temperature while ensuring that the gas inside the housing 11 can circulate normally.

[0036] like Figure 3As shown, the protection mechanism 10 also includes a pair of extension frames 15 arranged on the side of the two shells 11 away from the ventilation slots 13, and the extension frames 15 are spaced apart from the inner wall of the shell 11. The protection mechanism 10 also includes a placement seat 16 arranged at the interface between the shell 11 and the two ventilation slots 13.

[0037] The improvement lies in that: since a certain distance is provided between the extension frame 15 and the interface between the shell 11 and the ventilation slot 13, when the temperature sensing mechanism 20 senses that the temperature inside the shell 11 has risen, its own volume expands. During this process, the temperature sensing mechanism 20 will only expand toward one side of the heat-generating component 14, leaving space for the circulation of gas in the shell 11.

[0038] When the lithium battery equalizer is used in an environment with a high ambient temperature, if the heat generated by the heat-generating component 14 inside the equalizer is not dissipated in time, it will affect the voltage stabilization function of the equalizer. A common treatment method is to set a ventilation and heat dissipation component on the outer shell of the equalizer. If it is set in an open form, although the heat dissipation effect is guaranteed, there will be the following defects: on the one hand, the open design makes it easy for dust to enter the inside of the equalizer, especially in a humid working environment, and the water vapor entering the inside of the equalizer will also reduce its service life; on the other hand, if the equalizer is used in a low temperature environment, the open design will prevent the heat generated by the equalizer from accumulating, and the working environment with too low temperature will also affect the voltage stabilization effect of the equalizer on the lithium battery. Therefore, a temperature sensing mechanism 20 is provided to open the baffle 24 at high temperature and close the baffle 24 when heat dissipation is not required at low temperature.

[0039] Figure 4 and Figure 5 The state of the temperature sensing mechanism 20 under different temperature working environments and the flow direction of heat dissipated from the inside of the housing 11 to the outside are shown. First, the specific structure of the temperature sensing mechanism 20 is disclosed. The temperature sensing mechanism 20 also includes a temperature sensing airbag 21 arranged on the side of the extension frame 15 away from the ventilation slot 13, and the temperature sensing mechanism 20 also includes an expansion airbag 22 arranged on the side of the placement seat 16 close to the ventilation slot 13. A plurality of ventilation pipes 23 are connected between the temperature sensing airbag 21 and the expansion airbag 22;

[0040] Furthermore, the expansion coefficient of the lower part of the expansion bag 22 is greater than the expansion coefficient of the upper part of the expansion bag 22. The material of the upper part of the expansion bag 22 is fluororubber, and the material of the lower part of the expansion bag 22 is butyl rubber. The shape of the expansion bag 22 is set to be a hollow rectangular ring. When the gas in the upper and lower parts of the expansion bag 22 rises to the same temperature, the lower part of the expansion bag 22 expands to a larger volume, so that the baffle 24 rotates upward at a certain inclination angle and ensures the inclination angle. At the same time, the "small at the top and large at the bottom" shape of the expansion bag 22 provides support for the upwardly tilted baffle 24.

[0041] When the equalizer works in a high temperature environment, the temperature-sensing airbag 21 senses the heat that is hard to dissipate accumulated around the heat-generating component 14, and the temperature-sensing airbag 21 is filled with gas (generally nitrogen is used, the chemical properties of nitrogen are stable, and the preparation process is mature, and the cost is lower than other inert gases) and expands due to heat. At the same time, the volume of the gas in the expanded airbag 22 increases due to heat, thereby pushing open the baffle 24 originally sealed on the outside of the placement seat 16, and the temperature-sensing airbag 21 that is heated and expanded expands toward one side of the heat-generating component 14. The closer the distance to the heat source, the more sensitive the temperature-sensing airbag 21 is to the temperature. The more sensitive the perception, the more the volume of the temperature-sensing airbag 21 expands and occupies a part of the original gas circulation space under the premise of ensuring that the air inside the shell 11 can circulate with the outside world, so that the rate at which the hot air inside the shell 11 flows from the ventilation slot 13 to the outside world is accelerated; when the equalizer works in a low-temperature environment, a large part of the heat generated by the heat-generating component 14 can be dissipated through the temperature difference with the outside environment of the shell 11. If the baffle 24 is opened to dissipate heat, the working temperature of the heat-generating component 14 will be too low, which will also affect the voltage stabilization effect of the equalizer on the lithium battery. At this time, the gas in the expansion airbag 22 shrinks in volume when it is cold, and the expansion airbag 22 returns to its original deflated state. After losing the support of the expansion force of the expansion airbag 22, the baffle 24 is reset under the action of its own gravity, so as to be close to the placement seat 16, and the expansion airbag 22 made of rubber (butyl rubber and fluororubber) ensures the sealing between the inside of the shell 11 and the outside world, reduces the heat loss inside the shell 11, and prevents external dust, water vapor and other substances from entering the inside of the shell 11.

[0042] Explanation on the rationality of pushing the baffle 24 open by the expansion of the volume of the expansion airbag 22 in the temperature sensing mechanism 20:

[0043] The ideal gas state equation is PV = nRT, where P is the gas pressure, V is the gas volume, n is the amount of gas, R is the ideal gas constant, and T is the absolute temperature. Assuming that the initial volume V of the inflated airbag 22 is known, 0 , initial pressure P 0 and temperature T 0 , when the temperature rises to T 1 According to the equation, the pressure P at this time can be calculated 1 Then, the expansion force generated can be estimated based on the surface area and pressure change of the expansion bag 22. The expansion force generated only needs to be greater than the sum of the gravity of the baffle 24 and the resistance overcome when rotating upward, so that the baffle 24 can be pushed open. Under normal circumstances, when the temperature inside the shell 11 rises to about 40°C-60°C, the expansion force generated by the expansion bag 22 can push the baffle 24 open.

[0044] At high temperatures, the volume expansion of the inflatable airbag 22 lifts up the baffle 24 to enhance the heat dissipation effect on the heat-generating component 14. When the temperature of the working environment of the equalizer gradually decreases until the heat dissipation of the heat-generating component 14 is no longer needed, if the heat dissipation of the heat-generating component 14 continues at this time, the too low working temperature will also affect the voltage stabilization effect of the equalizer on the lithium battery.

[0045] like Figure 4 As shown, the baffle 24 is disposed on a side of the expansion airbag 22 away from the housing 11 , and the top of the expansion airbag 22 is rotatably connected to the inner wall of the ventilation slot 13 .

[0046] The improvement lies in that: if the baffle 24 is set to open sideways (left or right) or downward, the inflatable airbag 22 can push the baffle 24 open when heated, but when the temperature around the equalizer gradually decreases, it is difficult for the baffle 24 to automatically reset under the action of gravity. The additional reset mechanism will increase the difficulty of designing the equalizer in a small space.

[0047] When the inflatable airbag 22 expands due to heat and pushes the baffle 24 open, if the ambient temperature fluctuates, the volume of the inflatable airbag 22 will also fluctuate, so that the opening size of the baffle 24 will also change continuously, thereby affecting the heat dissipation effect to a certain extent. Therefore, a heat dissipation mechanism 30 is provided to ensure that the opening angle of the baffle 24 is stable while dissipating heat.

[0048] like Figure 6 As shown, the specific structure of the heat dissipation mechanism 30 is disclosed below. The heat dissipation mechanism 30 includes a limit frame 31 arranged at one end of the ventilation slot 13 away from the housing 11, the outer wall of the limit frame 31 is close to the inner wall of the notch of the ventilation slot 13, and a fan 32 is arranged in the limit frame 31. A driving member 33 is arranged on the side of the fan 32 close to the housing 11, and the fan 32 is coaxially connected with the output shaft of the driving member 33;

[0049] Furthermore, the driving member 33 is a brushless DC motor, which generates relatively low heat during operation; after the baffle 24 is pushed open by the expanded airbag 22, the power of the driving member 33 is turned on, and the driving member 33 drives the fan 32 coaxially connected to its own output shaft to rotate. On the one hand, the excess heat inside the shell 11 is drawn away from around the heat-generating component 14; on the other hand, the suction force generated by the rotating fan 32 in the ventilation slot 13 enables the baffle 24 to stably maintain the current elevation angle, ensuring that the heat can be stably dissipated from the opening of the baffle 24.

[0050] In summary, the working principle of the present scheme is as follows: when the equalizer works in a high-temperature environment, the temperature-sensing airbag 21 senses the heat that is difficult to dissipate accumulated around the heat-generating component 14, and the temperature-sensing airbag 21 is filled with gas (generally nitrogen is selected, the chemical properties of nitrogen are stable, and the preparation process is mature, and the cost is lower than other inert gases) and expands due to heat. At the same time, the volume of the gas in the expanded airbag 22 is also increased due to heat, thereby pushing open the baffle 24 originally sealed on the outside of the placement seat 16, and the heat-expanded temperature-sensing airbag 21 expands toward one side of the heat-generating component 14. The closer the distance to the heat source, the more sensitive the temperature-sensing airbag 21 is to temperature. On the premise of ensuring that the air inside the shell 11 can circulate with the outside air, the volume expansion of the temperature-sensing airbag 21 occupies a part of the original gas circulation space, so that the rate at which the hot air inside the shell 11 flows from the ventilation slot 13 to the outside is accelerated. At the same time, the power of the driving member 33 is turned on to drive the fan 32 to rotate, thereby accelerating the speed at which the heat inside the housing 11 is dissipated to the outside. At the same time, the suction force generated by the rotation of the fan 32 inside the ventilation slot 13 ensures the stability of the opening angle of the baffle 24, thereby ensuring the stability of the heat dissipation from the opening of the baffle 24.

[0051] When the equalizer is working in a low-temperature environment, a large part of the heat generated by the heat generating component 14 can be dissipated through the temperature difference with the external environment of the shell 11. If the baffle 24 is opened to dissipate heat, the working temperature of the heat generating component 14 will be too low, which will also affect the voltage stabilization effect of the equalizer on the lithium battery. At this time, the volume of the gas in the expansion bag 22 shrinks when it is cold, and the expansion bag 22 returns to its original deflated state. After losing the support of the expansion force of the expansion bag 22, the baffle 24 is reset under the action of its own gravity, so that it is close to the placement seat 16, and the expansion bag 22 made of rubber (butyl rubber and fluororubber) ensures the sealing between the inside of the shell 11 and the outside, reduces the heat loss inside the shell 11, and prevents external dust, water vapor and other substances from entering the inside of the shell 11.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A low-cost active fast equalizer for lithium batteries, characterized by: The protective mechanism (10) comprises a shell (11), a top cover (12) is provided on the top of the shell (11), ventilation slots (13) are provided on the outer sides of a pair of side walls away from each other of the shell (11), and a heating component (14) is provided inside the shell (11); A temperature sensing mechanism (20) is provided at the interface between the shell (11) and the two ventilation slots (13), the temperature sensing mechanism (20) at least comprising a baffle (24) arranged outside the shell (11), and a heat dissipation mechanism (30) is provided on the side of the two ventilation slots (13) away from the temperature sensing mechanism (20), the temperature sensing mechanism (20) is used to control the connection state between the shell (11) and the outside at different temperatures, and the heat dissipation mechanism (30) is used to accelerate the speed of heat dissipation inside the shell (11); When the shell (11) is in a high temperature environment, the baffle (24) opens the ventilation slot (13), and the temperature sensing mechanism (20) can accelerate the circulation rate of hot air inside the shell (11), and the heat dissipation mechanism (30) can ensure the stability of the opening angle of the baffle (24); when the shell (11) is in a low temperature environment, the baffle (24) closes the ventilation slot (13).

2. The low-cost active fast equalizer for lithium batteries according to claim 1, characterized in that: The protection mechanism (10) further comprises a pair of extension frames (15) arranged on a side of the two shells (11) away from the ventilation slots (13), the extension frames (15) being spaced apart from the inner side wall of the shells (11), and the protection mechanism (10) further comprises a placement seat (16) arranged at the interface between the shells (11) and the two ventilation slots (13).

3. The low-cost active fast equalizer for lithium batteries according to claim 2, characterized in that: The temperature sensing mechanism (20) further comprises a temperature sensing airbag (21) arranged on a side of the extension frame (15) away from the ventilation slot (13), and the temperature sensing mechanism (20) further comprises an expansion airbag (22) arranged on a side of the placement seat (16) close to the ventilation slot (13), and a plurality of ventilation pipes (23) are connected between the temperature sensing airbag (21) and the expansion airbag (22).

4. The low-cost active fast equalizer for lithium batteries according to claim 3, characterized in that: The baffle (24) is arranged on a side of the expansion airbag (22) away from the housing (11), and the top of the expansion airbag (22) is rotatably connected to the inner wall of the ventilation slot (13).

5. The low-cost active fast equalizer for lithium batteries according to claim 3, characterized in that: The expansion coefficient of the lower portion of the expansion airbag (22) is greater than the expansion coefficient of the upper portion of the expansion airbag (22).

6. The low-cost active fast equalizer for lithium batteries according to claim 1, characterized in that: The heat dissipation mechanism (30) comprises a limiting frame (31) arranged at one end of the ventilation slot (13) away from the housing (11); the outer wall of the limiting frame (31) is in close contact with the inner wall of the notch of the ventilation slot (13); a fan (32) is arranged inside the limiting frame (31); a driving member (33) is arranged on a side of the fan (32) close to the housing (11); the fan (32) is coaxially connected to an output shaft of the driving member (33).

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