A protective device for lithium-ion power battery and a method of using the same

Abstract

The present invention discloses a protective device for lithium-ion power batteries and a method for using the same, which relates to the technical field of batteries, and includes a battery, a protective shell, and a temperature control mechanism, wherein the temperature control mechanism includes two ventilation components, a cooling component, and a temperature control module, wherein the eight corners of the protective shell are provided with fixed blocks, the battery is fixed inside the protective shell by the fixed blocks and is separated from the inner wall of the protective shell by a distance, the two ventilation components are provided on a set of opposite sides of the protective shell, the cooling component is provided in coordination with the corresponding ventilation component, the temperature control mechanism is signal-connected with the ventilation component and the cooling component, and includes a temperature sensing module provided on the inner wall of the protective shell and the outer shell. The present invention can divide the heat dissipation state in combination with the working temperature of the battery and the external environment temperature, thereby improving the working quality of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of storage batteries, and in particular to a protection device for a lithium-ion power storage battery and a use method thereof. Background Art

[0002] Lithium-ion power battery is a new type of high-energy battery successfully developed in the 20th century. The negative electrode of this battery is made of graphite and other materials, and the positive electrode is made of lithium iron phosphate, lithium cobalt oxide, lithium titanate, etc. It has the advantages of high energy, high battery voltage, wide operating temperature range, and long storage life. Lithium-ion power batteries have partially replaced traditional batteries in mobile phones, portable computers, camcorders, cameras, etc. Large-capacity lithium-ion batteries have been tried in electric vehicles and will become one of the main power sources for electric vehicles in the 21st century. They have been used in artificial satellites, aerospace, and energy storage.

[0003] The protection of batteries mainly focuses on three aspects: anti-collision, waterproof and heat dissipation. Especially for large battery packs, the sealing and thermal protection will affect the working batteries. The existing protection devices for batteries generally set a well-sealed protective shell outside the battery, which also has the effect of anti-collision and waterproof, and then set components for heat dissipation such as heat dissipation fins on the protective shell, which can meet the safety requirements in most cases.

[0004] The battery will not only be affected by high temperature, but also start slowly and consume quickly in low temperature environment. If the protective shell still maintains the heat dissipation structure, the battery life will be further consumed. It is very inconvenient to replace the protective shell in order to increase the starting temperature. Summary of the invention

[0005] The object of the present invention is to provide a protection device for a lithium-ion power battery and a method of using the same, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a protection device for lithium-ion power batteries and a method of using the same, comprising a battery, a protective shell and a temperature control mechanism, wherein the temperature control mechanism comprises two ventilation components, a cooling component and a temperature control module, wherein the eight corners of the protective shell are provided with fixing blocks, the battery is fixed inside the protective shell by the fixing blocks and is separated from the inner wall of the protective shell by a certain distance, the two ventilation components are arranged on a set of opposite sides of the protective shell, the cooling component is arranged in coordination with the corresponding ventilation component, the temperature control mechanism is connected to the ventilation component and the cooling component by signal, and comprises a temperature sensing module arranged on the inner wall and the outer shell of the protective shell, which is used to monitor and process the temperature change in the protective shell;

[0007] Furthermore, the ventilation assembly includes a micro motor, a rotating rod, several bevel gears, a rotating gear, a rotating shaft and a rotating plate, wherein one end of the rotating rod is connected to the driving end of the micro motor, and the other end extends out of the surface of the protective shell, the bevel gears are sleeved on the rotating rod at intervals, the rotating gears are sleeved on the top of the corresponding rotating shaft and cooperate with the corresponding bevel gear teeth, and the rotating plate is set on the rotating shaft.

[0008] Furthermore, the position where the rotating shaft is inserted is separated from the boundary of the rotating plate by a distance, the protective shell is provided with a ventilation groove in cooperation with the rotating plate, and is provided with corresponding installation grooves in cooperation with other components of the ventilation assembly.

[0009] Furthermore, screens are connected to both sides of the rotating plate and both sides of the ventilation slots. The screens are made of elastic material with good resilience and are used to isolate external dust and impurities.

[0010] Furthermore, one end of the rotating rod extending out of the protective shell is sleeved with a rotating wheel, and a limiting block is provided at the end to prevent the rotating wheel from falling.

[0011] Furthermore, the cooling assembly includes a switch box, three refrigeration tanks and a pipeline assembly, wherein the outlet end of the refrigeration tank is connected to the switch box, and the pipeline assembly is connected to the switch box and the refrigeration tank.

[0012] Furthermore, one side of the switch box is provided with inlet grooves corresponding to the three refrigeration tanks, the middle part of the switch box is provided with a slide groove connected to the inlet groove, a slide plate is provided in the slide groove, the inward end of the slide plate is connected to the inside of the slide groove with a spring, the outward end of the slide plate is fixed with a connecting rope, and the other end of the connecting rope is wound around the rotating wheel, and the other side of the switch box is provided with an outlet groove connected to the pipeline assembly.

[0013] Furthermore, in the closed state, the slide block just blocks the three inlet slots, and the connecting rope has several turns of winding margin on the rotating wheel. When the connecting rope is wound on the rotating wheel, the slide block is slowly pulled out, thereby forming a passage between the inlet slot and the outlet slot, and liquid refrigerant is stored in the refrigeration tank.

[0014] Furthermore, the pipeline assembly includes a heat exchange pipe, a diverter box, a gas pipe and a liquid pipe, wherein the heat exchange pipe is a U-shaped connecting pipe arranged in the inner wall of the protective shell, the diverter box is arranged at the outlet of the heat exchange pipe, one end of the gas pipe is connected to the upper side of the diverter box, and the other end is connected to the interior of the protective shell, that is, the space where the battery is located; one end of the liquid pipe is connected to the lower side of the diverter box, and the other end is connected to an external coolant input and output device.

[0015] Furthermore, the external coolant input and output device is connected to the input end of each refrigeration tank at the same time.

[0016] Further, the specific method is as follows:

[0017] S1: The temperature control module collects temperature data outside the protective shell and selects the winding and unwinding state of the connecting rope to determine whether to start the cooling component;

[0018] S11: The suitable ambient temperature range of the battery is between 5-30℃. Considering the heat generated by the battery during operation, when the collected external temperature is greater than 25℃, the connection rope is wound up, i.e. the ventilation component and the cooling component are started at the same time. When the collected external temperature is less than or equal to 25℃, the connection rope is unwound, i.e. only the ventilation component is started.

[0019] S2: The temperature control module monitors the temperature data inside the protective shell to determine whether cooling is required;

[0020] S21: When the internal temperature collected is greater than 30 degrees, heat dissipation processing is required. When the internal temperature collected is less than or equal to 30 degrees, the ventilation component and the cooling component do not operate.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: by providing a temperature control mechanism, the temperature control module therein can divide the heat dissipation requirements of the battery when it is working according to the analyzed external ambient temperature, and can keep warm in a cold environment, and in a high temperature environment, can change the heat dissipation amplitude according to actual needs, thereby improving the working quality of the battery and extending its service life; by providing a screen, it can prevent external impurities from flowing into the interior while dissipating heat, thereby ensuring the clean state of the inside of the protective shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

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

[0024] Figure 2 It is a partial schematic diagram of the present invention;

[0025] Figure 3 is a schematic diagram of a pipeline assembly of the present invention;

[0026] Figure 4 is a cross-sectional view of a switch box of the present invention;

[0027] Figure 5 It is a schematic diagram of the connecting rope of the present invention in a reeled-in state;

[0028] Figure 6 This is a schematic diagram of the unwinding state of the connecting rope of the present invention;

[0029] In the figure: 1. battery; 2. protective shell; 21. fixing block; 22. ventilation slot; 23. mounting slot; 3. ventilation assembly; 31. micro motor; 32. rotating rod; 321. rotating wheel; 322. limiting block; 33. bevel gear; 34. rotating gear; 35. rotating shaft; 36. rotating plate; 361. screen; 4. cooling assembly; 41. switch box; 411. inlet slot; 412. slide slot; 413. slide plate; 414. spring; 415. connecting rope; 416. outlet slot; 42. refrigeration tank; 43. heat exchange pipe; 44. diverter box; 45. gas pipe; 46. liquid pipe. Implementation

[0030] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. 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.

[0031] See also Figure 1-6 The present invention provides a technical solution: a protection device for a lithium-ion power battery and a method of using the same, comprising a battery 1, a protective shell 2 and a temperature control mechanism, the temperature control mechanism comprising two ventilation components 3, a cooling component 4 and a temperature control module, wherein the eight corners of the protective shell 2 are provided with fixing blocks 21, the battery 1 is fixed inside the protective shell 2 by the fixing blocks 21 and is separated from the inner wall of the protective shell 2 by a certain distance, the two ventilation components 3 are arranged on a set of opposite sides of the protective shell 2, the cooling component 4 is arranged in coordination with the corresponding ventilation components 3, the temperature control mechanism is connected to the ventilation components 3 and the cooling component 4 by signal, and comprises a temperature sensing module arranged on the inner wall and the outer shell of the protective shell 2, which is used to monitor the temperature change in the protective shell 2 and perform processing;

[0032] The ventilation assembly 3 includes a micro motor 31, a rotating rod 32, several bevel gears 33, a rotating gear 34, a rotating shaft 35 and a rotating plate 36, wherein one end of the rotating rod 32 is connected to the driving end of the micro motor 31, and the other end extends out of the surface of the protective shell 2, the bevel gears 33 are sleeved on the rotating rod 32 at intervals, the rotating gear 34 is sleeved on the top of the corresponding rotating shaft 35 and cooperates with the corresponding teeth of the bevel gear 33, and the rotating plate 36 is set on the rotating shaft 35.

[0033] It should be supplemented that: the position where the rotating shaft 35 is inserted is separated from the boundary of the rotating plate 36 by a distance, the protective shell 2 is provided with a ventilation slot 22 in cooperation with the rotating plate 36 , and corresponding installation slots 23 are provided in cooperation with other components of the ventilation assembly 3 .

[0034] Screens 361 are connected to both sides of the rotating plate 36 and both sides of the ventilation slot 21. The screens 361 are made of elastic material with good resilience and are used to isolate external dust and impurities.

[0035] In actual operation, after the micro motor 31 drives the bevel gear 33 on the rotating rod 32 to rotate, the matching rotating gear 34 drives the rotating plate 36 on the rotating shaft 35 to deflect to achieve communication between the inside and outside of the protective shell 2, and the screen 361 is pulled and extended by the rotating plate 36, and recovers after the rotating plate 36 is reset.

[0036] One end of the rotating rod 32 extending out of the protective housing 2 is sleeved with a rotating wheel 321 , and a limiting block 322 is provided at the end to prevent the rotating wheel 321 from falling.

[0037] The cooling assembly 4 includes a switch box 41 , three refrigeration tanks 42 and a pipeline assembly, wherein the outlet end of the refrigeration tank 42 is connected to the switch box 41 , and the pipeline assembly is connected to the switch box 41 and the refrigeration tank 42 .

[0038] An inlet groove 411 is provided on one side of the switch box 41 corresponding to the three refrigeration tanks 42. A slide groove 412 connected to the inlet groove 411 is provided in the middle of the switch box 41. A slide plate 413 is provided in the slide groove 412. The inward end of the slide plate 413 is connected to the inside of the slide groove 412 with a spring 414. A connecting rope 415 is fixed to the outward end of the slide plate 413, and the other end of the connecting rope 415 is wound around the rotating wheel 321. An outlet groove 416 connected to the pipeline assembly is provided on the other side of the switch box 41.

[0039] It should be noted that: in the closed state, the slide plate 413 just blocks the three inlet grooves 411, and the connecting rope 415 has several turns of winding margin on the rotating wheel 321. When the connecting rope 415 is wound on the rotating wheel 321, the slide plate 413 is slowly pulled out, so that a passage is formed between the inlet groove 411 and the outlet groove 416, and liquid refrigerant is stored in the refrigeration tank 42.

[0040] The pipeline assembly includes a heat exchange pipe 43, a diverter box 44, a gas pipe 45 and a liquid pipe 46, wherein the heat exchange pipe 43 is a U-shaped connecting pipe arranged in the inner wall of the protective shell 2, the diverter box 44 is arranged at the outlet of the heat exchange pipe 43, one end of the gas pipe 45 is connected to the upper side of the diverter box 44, and the other end is connected to the inside of the protective shell 2, that is, the space where the battery 1 is located, and one end of the liquid pipe 46 is connected to the lower side of the diverter box 44, and the other end is connected to the external coolant input and output device.

[0041] It should be additionally explained that the external coolant input and output device is connected to the input end of each refrigeration tank 42 at the same time.

[0042] In actual operation, after a passage is formed in the switch box 41, the refrigeration tank 42 transports the coolant to the heat exchange pipe 43. The coolant continuously absorbs the heat in the protective shell 2 during the circulation of the heat exchange pipe 43, and partially vaporizes. When it flows to the diversion box 44, the liquid part will be output from the liquid pipe 46, and the gaseous part will flow into the protective shell 2, squeezing the internal hot air flow, and realizing the cooling exchange of the internal gas through the ventilation component 3. Even if the coolant absorbs heat and vaporizes, its gaseous temperature will still be maintained within a low temperature range. For example, the evaporation temperature of the refrigerant R717 is 4.1°C, so the gaseous coolant can also have a cooling effect.

[0043] The specific implementation methods are as follows:

[0044] S1: The temperature control module collects temperature data outside the protective housing 2 and selects the reeling and unreeling state of the connecting rope 415 to determine whether to start the cooling assembly 4;

[0045] S11: The suitable ambient temperature range of the battery is between 5-30°C. Considering the heat generated by the battery during operation, when the collected external temperature is greater than 25 degrees, the connection rope 415 is selected to be in a reeled state, that is, the ventilation component 3 and the cooling component 4 are simultaneously started; when the collected external temperature is less than or equal to 25 degrees, the connection rope 415 is selected to be in an unreeled state, that is, only the ventilation component 3 is started;

[0046] S2: The temperature control module monitors the temperature data inside the protective housing 2 to determine whether cooling and heat dissipation are required;

[0047] S21: When the collected internal temperature is greater than 30 degrees, heat dissipation processing is required. When the collected internal temperature is less than or equal to 30 degrees, the ventilation component 3 and the cooling component 4 do not operate.

[0048] Example 1: External ambient temperature is less than or equal to 25 degrees

[0049] When the battery 1 is working, when the temperature control module detects that the temperature inside the protective shell 2 is less than or equal to 30 degrees, the ventilation component 3 always remains in a closed state to avoid excessive loss of internal heat, thereby achieving a warming effect in a cold environment and improving the working efficiency of the battery 1; when the temperature control module detects that the temperature inside the protective shell 2 is greater than 30 degrees, the micro motor 31 is controlled to drive the rotating rod 32 to rotate in the unwinding direction of the connecting rope 415, and the connecting rope 415 will not pull the slide plate 413, that is, the cooling component 4 is in a closed state. At this time, the rotating plate 36 is deflected to make the inside and outside of the protective shell 2 communicate with each other, so as to evacuate the internal heat in time, and close the ventilation component 3 after the internal temperature drops to 25 degrees.

[0050] Example 2: External ambient temperature is greater than 25 degrees

[0051] When the battery 1 is working, when the temperature control module detects that the temperature inside the protective shell 2 is less than or equal to 30 degrees, the ventilation component 3 always remains in a closed state; when the temperature control module detects that the temperature inside the protective shell 2 is greater than 30 degrees, the micro motor 31 is controlled to drive the rotating rod 32 to rotate in the winding direction of the connecting rope 415, and the sliding plate 413 opens a corresponding number of inlet slots 411 according to the pulling amplitude of the connecting rope 415, and the refrigerant in the refrigeration tank 42 flows into the heat exchange pipe 43 to perform heat exchange in the protective shell 2;

[0052] The deflection angle of the rotating plate 36 can correspond to the number of entrance slots 411 opened. For example, a deflection of 30 degrees of the rotating plate 36 corresponds to the opening of one entrance slot 411, a deflection of 60 degrees of the rotating plate 36 corresponds to the opening of two entrance slots 411, and a deflection of 90 degrees of the rotating plate 36 corresponds to the opening of three entrance slots 411, thereby dividing different heat dissipation gears to cope with different heat dissipation requirements. The winding amplitude of the connecting rope 415 is achieved by adjusting the shaft diameter of the rotating wheel 321.

[0053] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0054] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A protection device for lithium-ion power batteries, Features: include: A storage battery (1), a protective shell (2) and a temperature control mechanism, wherein the temperature control mechanism comprises two ventilation components (3), a cooling component (4) and a temperature control module, wherein the eight corners of the protective shell (2) are provided with fixing blocks (21), the storage battery (1) is fixed inside the protective shell (2) by the fixing blocks (21) and is separated from the inner wall of the protective shell (2) by a certain distance, the two ventilation components (3) are arranged on a set of opposite sides of the protective shell (2), the cooling component (4) is arranged in coordination with the corresponding ventilation component (3), the temperature control mechanism is signal-connected with the ventilation component (3) and the cooling component (4), and comprises a temperature sensing module arranged on the inner wall and the outer shell of the protective shell (2) for monitoring and processing the temperature change in the protective shell (2); The ventilation assembly (3) comprises a micro motor (31), a rotating rod (32), a plurality of bevel gears (33), a rotating gear (34), a rotating shaft (35) and a rotating plate (36), wherein one end of the rotating rod (32) is connected to the driving end of the micro motor (31), and the other end extends out of the surface of the protective housing (2); the bevel gears (33) are sleeved on the rotating rod (32) at intervals; the rotating gears (34) are sleeved on the top of the corresponding rotating shaft (35) and cooperate with the teeth of the corresponding bevel gears (33); and the rotating plate (36) is arranged on the rotating shaft (35); The cooling assembly (4) comprises a switch box (41), three refrigeration tanks (42) and a pipeline assembly, wherein the outlet end of the refrigeration tank (42) is connected to the switch box (41), and the pipeline assembly is connected to the switch box (41) and the refrigeration tank (42); One side of the switch box (41) is provided with an inlet groove (411) corresponding to the three refrigeration tanks (42); a slide groove (412) connected to the inlet groove (411) is provided in the middle of the switch box (41); a slide plate (413) is provided in the slide groove (412); an inward end of the slide plate (413) is connected to the inside of the slide groove (412) with a spring (414); a connecting rope (415) is fixed to an outward end of the slide plate (413); and the other end of the connecting rope (415) is wound around a rotating wheel (321); and an outlet groove (416) connected to a pipeline assembly is provided on the other side of the switch box (41).

2. A protection device for a lithium-ion power battery according to claim 1, Features: The rotation shaft (35) is disposed at a position which is spaced a distance from the boundary of the rotating plate (36); the protective housing (2) is provided with a ventilation slot (22) in cooperation with the rotating plate (36); and corresponding mounting slots (23) are provided in cooperation with other components of the ventilation assembly (3).

3. A protection device for a lithium-ion power battery according to claim 2, Features: Screens (361) are connected to both sides of the rotating plate (36) and both sides of the ventilation slot (21), and the screens (361) are made of an elastic material with good resilience.

4. A protection device for a lithium-ion power battery according to claim 3, Features: One end of the rotating rod (32) extending out of the protective housing (2) is sleeved with a rotating wheel (321), and a limiting block (322) is provided at the end of the rotating rod (32).

5. A protection device for a lithium-ion power battery according to claim 4, Features: The pipeline assembly comprises a heat exchange pipeline (43), a diverter box (44), a gas pipeline (45) and a liquid pipeline (46), wherein the heat exchange pipeline (43) is a U-shaped connecting pipe arranged in the inner wall of the protective shell (2), the diverter box (44) is arranged at the outlet of the heat exchange pipeline (43), one end of the gas pipeline (45) is connected to the upper side of the diverter box (44), and the other end is connected to the interior of the protective shell (2), i.e., the space where the battery (1) is located, and one end of the liquid pipeline (46) is connected to the lower side of the diverter box (44), and the other end is connected to an external coolant input and output device.

6. A protection device for a lithium-ion power battery according to claim 5, Features: The external coolant input and output device is simultaneously connected to the input ends of each refrigeration tank (42).

7. A method for using a protective device for a lithium-ion power battery according to claim 6, Features: The specific steps are as follows: S1: The temperature control module collects temperature data outside the protective housing (2) and selects the reeling and unreeling state of the connecting rope (415) to determine whether to start the cooling component (4); S11: The suitable ambient temperature range of the battery is between 5°C and 30°C. Considering that the battery generates heat during operation, when the external temperature collected is greater than 25°C, the connection rope (415) is selected to be in a reeled state, i.e., the ventilation component (3) and the cooling component (4) are simultaneously activated. When the external temperature collected is less than or equal to 25°C, the connection rope (415) is selected to be in an unreeled state, i.e., only the ventilation component (3) is activated. S2: The temperature control module monitors the temperature data inside the protective housing (2) to determine whether cooling and heat dissipation are required; S21: When the collected internal temperature is greater than 30°C, heat dissipation processing is required. When the collected internal temperature is less than or equal to 30°C, the ventilation component (3) and the cooling component (4) do not operate.

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