Central vacuum system for lithium battery factory

Abstract

The utility model discloses a central vacuum system for a lithium battery factory. The central vacuum system comprises a vacuum pump, a first main pipe, a second main pipe, a third main pipe and a control system, a plurality of vacuum pumps are arranged; the first main pipe is connected with a plurality of first branch pipes, and each first branch pipe is correspondingly connected with one vacuum pump; one end of the second main pipe is connected with the first main pipe, and the other end of the second main pipe is connected with the third main pipe; the third main pipe is also connected with a plurality of sixth branch pipes, and each sixth branch pipe is correspondingly connected to a working section for lithium battery production; and the control system is electrically connected with the vacuum pump. In the scheme, the multiple vacuum pumps are arranged in a centralized mode, the control system can control the vacuum pumps according to the vacuum requirement condition, and the air exhaust capacity of the vacuum pumps is fully utilized. In addition, the vacuum pumps are centrally arranged, so that tail gas exhausted by the vacuum pumps can be conveniently and centrally treated.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery production vacuum technical field more specifically, relate to a central vacuum system for lithium electricity factory. BACKGROUND

[0002] The slurry mixing, liquid injection, formation, assembly, cutting and other processes of lithium ion battery factory need to use the vacuum system, but in the existing new production line or previous production line, most of the lithium battery factories are equipped with one vacuum system for each process section, and are dispersedly arranged in the power area outside the workshop or the vacuum pump house.

[0003] The existing vacuum system arrangement mode has the following problems, the vacuum system arrangement is relatively dispersed, the vacuum pump tail gas centralized treatment is difficult and high in cost, in order to reduce noise and be beautiful, some lithium battery factories will set up a vacuum pump house for each process section, and the investment cost is large, in the new production line, the vacuum pump will be configured according to the vacuum energy consumption demand of the battery cell equipment, which will lead to the fact that the vacuum pump model is usually not the same, but after uniform model, the vacuum system of some process sections will have excess vacuum extraction capacity, in the battery cell production line production, such as the slurry mixing section, the slurry mixing kettle is usually full-load vacuum extraction only when feeding, and then intermittent vacuum extraction pressure maintaining, while the vacuum pump is in the open state, and the situation of other process sections is also the same, which causes serious waste of the vacuum pump air extraction capacity. UTILITY MODEL CONTENTS

[0004] In view of at least some problems in the prior art, the utility model provides a central vacuum system for lithium battery factory, which can fully utilize the vacuum pump air extraction capacity and facilitate centralized tail gas treatment.

[0005] To achieve the above purpose, the utility model provides a technical scheme as follows:

[0006] A central vacuum system for lithium battery factory, comprising a vacuum pump, a first main pipe, a second main pipe, a third main pipe and a control system, wherein the vacuum pump is provided with multiple; a plurality of first branch pipes are connected to the first main pipe, and each first branch pipe is connected to one vacuum pump; one end of the second main pipe is connected to the first main pipe, and the other end is connected to the third main pipe; a plurality of sixth branch pipes are further connected to the third main pipe, and each sixth branch pipe is connected to one process section of lithium battery production; and the control system is electrically connected to the vacuum pump.

[0007] In the scheme, multiple vacuum pumps are centrally arranged, and the vacuum pumps are connected to the first main pipe through the first branch pipe. The first main pipe is connected to the lithium battery production section with vacuum demand through the second main pipe, the third main pipe and the sixth branch pipe. The vacuum pump is connected to the section with vacuum demand through the second main pipe. The control system can control the vacuum pump according to the vacuum demand, and fully utilize the air exhaust capacity of the vacuum pump. In addition, the vacuum pumps are centrally arranged, which is more convenient for centralized treatment of the exhaust gas discharged from the vacuum pumps.

[0008] As a further improvement, a pre-filter and a first valve are further arranged on the first branch pipe. The pre-filter is arranged to filter the air.

[0009] As a further improvement, a check valve is connected to the sixth branch pipe. The check valve is arranged to avoid mutual air surge between the vacuum demand ends of the battery cell devices.

[0010] As a further improvement, a second valve and a pressure sensor are arranged on the sixth branch pipe; and the second valve and the pressure sensor are further electrically connected to the control system.

[0011] As a further improvement, a third branch pipe and a second branch pipe are connected to the second main pipe, and a vacuum trap tank is connected between the third branch pipe and the second branch pipe. A valve one is arranged on each of the third branch pipe and the second branch pipe. A valve two is further arranged on the second main pipe, and the valve two is located between the third branch pipe and the second branch pipe.

[0012] As a further improvement, a fourth branch pipe and a fifth branch pipe are further connected to the second main pipe. A gas-liquid separation tank is connected between the fourth branch pipe and the fifth branch pipe. A valve three is arranged on each of the fourth branch pipe and the fifth branch pipe. A valve four is further arranged on the second main pipe, and the valve four is located between the fourth branch pipe and the fifth branch pipe.

[0013] As a further improvement, the exhaust gas treatment device is further connected to each of the vacuum pumps.

[0014] As a further improvement, a cooling water inlet main pipe and a cooling water outlet main pipe are further included. The cooling water inlet main pipe is connected to the fifth main pipe. The fifth main pipe is connected to multiple eighth branch pipes. The eighth branch pipes are connected to the vacuum pumps. The vacuum pumps are further connected to the cooling water outlet main pipe through the ninth branch pipe. A temperature sensor is arranged on the eighth branch pipe. A third valve is connected to the fifth main pipe. The temperature sensor and the third valve are further electrically connected to the control system.

[0015] As a further improvement, the vacuum pump is an oil-free screw vacuum pump; further comprising a nitrogen main pipe connected with a seventh main pipe, a plurality of tenth branch pipes connected with the vacuum pump are connected on the seventh main pipe; the fourth valve and the flow sensor are further arranged on the seventh main pipe and are electrically connected with the control system.

[0016] As a further improvement, the vacuum pump is an oil screw vacuum pump.

[0017] Compared with the prior art, the technical scheme has the following beneficial effects:

[0018] (1) The central vacuum system for the lithium battery factory in the utility model, by placing the vacuum pump in the same vacuum pump house, not only achieves the purpose of noise reduction and beauty, but also reduces the number of workshop vacuum pump house configuration, reduces the pump house construction cost.

[0019] (2) The central vacuum system for the lithium battery factory in the utility model, by the linkage control of the control system to the vacuum pump and the vacuum demand end of the cell equipment, fully utilizes the air extraction capacity of the vacuum pump, reduces the number of vacuum pumps in the initial stage of the newly-built production line, and greatly reduces the investment cost.

[0020] (3) The central vacuum system for the lithium battery factory in the utility model, the scheme only needs a cooling water main pipe and a nitrogen main pipe to be connected to the vacuum pump house, which reduces the pipeline layout cost. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a vacuum system structure schematic view of the utility model embodiment 1;

[0022] Figure 2 It is a vacuum system structure schematic view of the utility model embodiment 2.

[0023] Label explanation:

[0024] 1, vacuum pump; 2, pre-filter; 3, first valve; 4, first main pipe; 5, third branch pipe; 6, vacuum trap tank; 7, second branch pipe; 8, second main pipe; 9, gas-liquid separation tank; 10, third main pipe; 11, check valve; 12, second valve; 13, pressure sensor; 14, vacuum demand end of battery cell device; 15, sixth branch pipe; 16, fourth branch pipe; 17, fifth branch pipe; 18, control system; 19, first branch pipe; 20, eighth branch pipe; 21, temperature sensor; 22, third valve; 23, cooling water inlet main pipe; 24, cooling water outlet main pipe; 25, nitrogen gas main pipe; 26, fourth valve; 27, flow sensor; 28, ninth branch pipe; 29, seventh branch pipe; 30, fourth main pipe; 31, seventh main pipe; 32, tenth branch pipe; 33, sixth main pipe; 34, fifth main pipe; 35, tail gas treatment device. DETAILED DESCRIPTION

[0025] For further understanding of the present application, the present application will be described in detail with reference to the drawings and embodiments.

[0026] The structure, proportion, size, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, for understanding and reading by those skilled in the art, and are not used to limit the limiting conditions of the implementation of the present application, so they do not have substantial technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like in the specification are only for the convenience of clear description, and are not used to limit the scope of implementation. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation scope of the present application.

[0027] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein.

[0028] Embodiment 1

[0029] As shown in Figure 1 , the present embodiment provides a central vacuum system for a lithium battery factory, which includes a vacuum pump 1, a first main pipe 4, a second main pipe 8, a third main pipe 10 and a control system 18.

[0030] The plurality of vacuum pumps 1 are arranged in the vacuum pump house. In the embodiment, the vacuum pumps 1 are oil-free screw vacuum pumps. The oil-free screw vacuum pump is a conventional vacuum pump, which sucks, compresses and discharges gas by rotating two intermeshing screws in the pump cavity.

[0031] In the embodiment, the first main pipe 4 is connected with a plurality of first branch pipes 19, the number of the first branch pipes 19 corresponds to the number of the vacuum pumps 1, and each first branch pipe 19 is connected with one vacuum pump 1. One end of the second main pipe 8 is connected with the first main pipe 4, and the other end is connected with the third main pipe 10. The third main pipe 10 is further connected with a plurality of sixth branch pipes 15, and each sixth branch pipe 15 is connected with one lithium battery production section.

[0032] In the embodiment, the control system 18 is electrically connected with the vacuum pumps 1. The control system 18 controls the start and stop of the vacuum pumps 1 according to the vacuum demand of each lithium battery production section. The lithium battery production section includes slurry mixing, liquid injection, formation, cutting and assembly, etc. In a specific embodiment, one lithium battery production section is connected with one electric core device vacuum demand end 14, which can be a slurry mixing device vacuum demand end, a liquid injection device vacuum demand end, a formation device vacuum demand end, a cutting device vacuum demand end, an assembly device vacuum demand end, etc. The electric core device vacuum demand end 14 is a pipe which is connected with the sixth branch pipe 15 through a flange.

[0033] In the embodiment, the plurality of vacuum pumps 1 are arranged in the vacuum pump house. In the embodiment, the vacuum pumps 1 are oil-free screw vacuum pumps. The oil-free screw vacuum pump is a conventional vacuum pump, which sucks, compresses and discharges gas by rotating two intermeshing screws in the pump cavity.

[0034] As a further improvement, the first branch pipe 19 is further provided with a pre-filter 2 for gas filtration. Further, the first branch pipe 19 is further provided with a first valve 3, which is located on the inlet side of the pre-filter 2.

[0035] Preferably, the sixth branch pipe 15 is connected with a check valve 11, which allows the gas in each sixth branch pipe 15 to flow in one direction only during vacuum pumping. The flow direction is from the lithium battery production section with vacuum demand to the third main pipe 10. The check valve 11 prevents the phenomenon of mutual gas surge between the electric core device vacuum demand ends.

[0036] The sixth branch pipe 15 is provided with a second valve 12 and a pressure sensor 13, and the second valve 12 and the pressure sensor 13 are also electrically connected with the control system 18. Specifically, the second valve 12 can be an electromagnetic valve, which is electrically connected with the control system 18.

[0037] As a preferred embodiment, the second main pipe 8 is connected with the third branch pipe 5 and the second branch pipe 7, and the vacuum trap tank 6 is connected between the third branch pipe 5 and the second branch pipe 7. Further, one valve one is arranged on each of the third branch pipe 5 and the second branch pipe 7. Further, a valve two is arranged on the second main pipe 8, and the valve two is located between the third branch pipe 5 and the second branch pipe 7. Specifically, the second branch pipe 7 is in communication with the gas inlet of the vacuum trap tank 6, and the third branch pipe 5 is in communication with the gas outlet of the vacuum trap tank 6. During normal operation of the system, the valve two on the second main pipe 8 is in a closed state, and the gas flows through the second branch pipe 7, the vacuum trap tank 6 and the third branch pipe 5. The vacuum trap tank 6 can be connected to the third branch pipe 5 and the second branch pipe 7 through flanges. If the vacuum trap tank 6 needs to be overhauled, the valve two on the second main pipe 8 can be opened, and the valve one on each of the third branch pipe 5 and the second branch pipe 7 can be closed, so that the vacuum trap tank 6 can be overhauled without stopping the system.

[0038] In addition, the second main pipe 8 is also connected with the fourth branch pipe 16 and the fifth branch pipe 17, and the gas-liquid separation tank 9 is connected between the fourth branch pipe 16 and the fifth branch pipe 17. Further, one valve three is arranged on each of the fourth branch pipe 16 and the fifth branch pipe 17. Further, a valve four is arranged on the second main pipe 8, and the valve four is located between the fourth branch pipe 16 and the fifth branch pipe 17. Specifically, the fourth branch pipe 16 is in communication with the gas inlet of the gas-liquid separation tank 9, and the fifth branch pipe 17 is in communication with the gas outlet of the gas-liquid separation tank 9. During normal operation of the system, the valve four on the second main pipe 8 is in a closed state, and the gas flows through the fourth branch pipe 16, the gas-liquid separation tank 9 and the fifth branch pipe 17. The gas-liquid separation tank 9 can be connected to the fourth branch pipe 16 and the fifth branch pipe 17 through flanges. If the gas-liquid separation tank 9 needs to be overhauled, the valve four on the second main pipe 8 can be opened, and the valve three on each of the fourth branch pipe 16 and the fifth branch pipe 17 can be closed, so that the gas-liquid separation tank 9 can be overhauled without stopping the system.

[0039] In one case, the gas-liquid separation tank 9 is arranged on one side of the gas inlet of the vacuum trap tank 6. By arranging the gas-liquid separation tank 9 on the vacuum trap tank 6, the gas can be filtered, and the pressure can be balanced to protect the system.

[0040] The central vacuum system for lithium battery factory further comprises a tail gas treatment device 35 connected with each vacuum pump 1 for treating the tail gas of the vacuum pump 1. Specifically, the central vacuum system further comprises a fourth main pipe 30 and a plurality of seventh branch pipes 29 corresponding in number to the vacuum pumps 1, the tail gas discharge port of the vacuum pump 1 being connected with the seventh branch pipe 29, the seventh branch pipe 29 being connected to the fourth main pipe 30, and the fourth main pipe 30 being connected to the tail gas treatment device 35.

[0041] In order to cool, the central vacuum system for lithium battery factory further comprises a cooling water inlet main pipe 23 and a cooling water outlet main pipe 24. Specifically, the cooling water inlet main pipe 23 is connected with the fifth main pipe 34, and the fifth main pipe 34 is connected with a plurality of eighth branch pipes 20 connected with the cooling water inlet of the vacuum pump 1. In addition, the vacuum pump 1 is further connected with the cooling water outlet main pipe 24 through a ninth branch pipe 28; specifically, the cooling water outlet main pipe 24 is connected with a sixth main pipe 33 in communication with the cooling water outlet main pipe 24; and the cooling water outlet of the vacuum pump 1 is in communication with the sixth main pipe 33 through the ninth branch pipe 28.

[0042] In order to facilitate control, a temperature sensor 21 is arranged on the eighth branch pipe 20, and a third valve 22 is connected with the fifth main pipe 34. The temperature sensor 21 and the third valve 22 are further electrically connected with the control system 18. Specifically, the third valve 22 can be selected as an electromagnetic valve for electrical connection with the control system 18.

[0043] Since the vacuum pump 1 is an oil-free screw vacuum pump, a nitrogen main pipe 25 is arranged in the system for inputting nitrogen for purging the inside of the vacuum pump 1. The nitrogen main pipe 25 is connected with a seventh main pipe 31, and the seventh main pipe 31 is connected with a plurality of tenth branch pipes 32 connected with the nitrogen inlet of the vacuum pump 1. The seventh main pipe 31 is further provided with a fourth valve 26 and a flow sensor 27, and the fourth valve 26 and the flow sensor 27 are further electrically connected with the control system 18. Specifically, the fourth valve 26 can be selected as an electromagnetic valve for electrical connection with the control system 18.

[0044] The central vacuum system in the present scheme is specifically provided that the vacuum pump 1, the control system 18, the vacuum capture tank 6 and the gas-liquid separation tank 9 are placed in the same vacuum pump house, and the tail gas treatment device 35 is placed outside the vacuum pump house and arranged close to the vacuum pump house. During operation, the gas from the vacuum demand end 14 of each battery cell device is captured by the gas-liquid separation tank 9, the vacuum capture tank 6 and the pre-filter 2, and then compressed and discharged by the vacuum pump 1 to the tail gas treatment device 35 for tail gas treatment, so as to perform vacuum pumping. The control system 18 controls the second valve 12, the pressure sensor 13 and the vacuum pump 1 to ensure the vacuum demand of the vacuum demand end of each battery cell device, so as to achieve the purpose of energy saving. During the operation of the vacuum pump 1, the cooling water inlet main pipe 23 and the cooling water outlet main pipe 24 are in the open state, and the control system 18 controls the temperature sensor 21 on the eighth branch pipe 20, the third valve 22 on the cooling water inlet main pipe 23, the flow sensor 27 on the seventh main pipe 31 and the fourth valve 26 to control the flow of cooling water and nitrogen, so as to achieve the purpose of saving the energy consumption of cooling water and nitrogen.

[0045] Embodiment 2

[0046] As shown in the figure, the present embodiment provides a central vacuum system for a lithium battery factory. The vacuum pump 1 is an oil screw vacuum pump, so in the present embodiment, nitrogen is not input for purging compared with embodiment 1. Figure 2

[0047] Compared with embodiment 1, the present embodiment does not provide a nitrogen main pipe 25, a seventh main pipe 31, a tenth branch pipe 32, a fourth valve 26 and a flow sensor 27. The other settings of the central vacuum system in the present embodiment are consistent with those in embodiment 1, and will not be described again.

[0048] The central vacuum system in the present scheme is specifically provided that the vacuum pump 1, the control system 18, the vacuum capture tank 6 and the gas-liquid separation tank 9 are placed in the same vacuum pump house, and the tail gas treatment device 35 is placed outside the vacuum pump house and arranged close to the vacuum pump house. During operation, the gas from the vacuum demand end 14 of each battery cell device is captured by the gas-liquid separation tank 9, the vacuum capture tank 6 and the pre-filter 2, and then compressed and discharged by the vacuum pump 1 to the tail gas treatment device 35 for tail gas treatment, so as to perform vacuum pumping. The control system 18 controls the second valve 12, the pressure sensor 13 and the vacuum pump 1 to ensure the vacuum demand of the vacuum demand end of each battery cell device, so as to achieve the purpose of energy saving. During the operation of the vacuum pump 1, the cooling water inlet main pipe 23 and the cooling water outlet main pipe 24 are in the open state, and the control system 18 controls the temperature sensor 21 on the eighth branch pipe 20, the third valve 22 on the cooling water inlet main pipe 23, the flow sensor 27 on the seventh main pipe 31 and the fourth valve 26 to control the flow of cooling water and nitrogen, so as to achieve the purpose of saving the energy consumption of cooling water and nitrogen.

[0049] ​Compared with example 1, the oil screw vacuum pump in the embodiment has better frequency energy-saving effect, and the oil screw vacuum pump has large specification, so that the number of production line configurations can be reduced, and the floor area of the vacuum pump house can be saved. The embodiment is more suitable for the vacuum demand of large air volume of the battery cell production line.

[0050] The terms "mount", "set", "provided with", and "connected" should be understood in a broad sense. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] The above describes the present application and its embodiments in a schematic manner, which is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it, without departing from the creative spirit of the present application, similar structural modes and embodiments can be designed without creativity, which should belong to the protection scope of the present application.

Claims

1. A central vacuum system for a lithium electrotechnical plant, characterized by: The vacuum pump (1), the first main pipe (4), the second main pipe (8), the third main pipe (10) and the control system (18) are included. The vacuum pump (1) is provided with multiple; The first main pipe (4) is connected with multiple first branch pipes (19), and each first branch pipe (19) is connected with one vacuum pump (1) correspondingly. One end of the second main pipe (8) is connected with the first main pipe (4), and the other end is connected with the third main pipe (10). The third main pipe (10) is also connected with multiple sixth branch pipes (15), and each sixth branch pipe (15) is connected with one lithium battery production section correspondingly. The control system (18) is electrically connected with the vacuum pump (1).

2. The central vacuum system for a lithium battery factory of claim 1, wherein: The first branch pipe (19) is also provided with a pre-filter (2) and a first valve (3).

3. The central vacuum system for a lithium battery factory of claim 1, wherein: The sixth branch pipe (15) is connected with a check valve (11).

4. Central vacuum system for a lithium electrotechnical plant according to claim 1 or 3, characterized in that: The sixth branch pipe (15) is provided with a second valve (12) and a pressure sensor (13), and the second valve (12) and the pressure sensor (13) are also electrically connected with the control system (18).

5. The central vacuum system for a lithium battery factory of claim 1, wherein: The second main pipe (8) is connected with a third branch pipe (5) and a second branch pipe (7), and a vacuum capture tank (6) is connected between the third branch pipe (5) and the second branch pipe (7). One valve is arranged on the third branch pipe (5) and the second branch pipe (7) respectively. A second valve is also arranged on the second main pipe (8), and the second valve is located between the third branch pipe (5) and the second branch pipe (7).

6. The central vacuum system for a lithium electrotechnical plant according to claim 1 or 5, characterized in that: The second main pipe (8) is also connected with a fourth branch pipe (16) and a fifth branch pipe (17), and a gas-liquid separation tank (9) is connected between the fourth branch pipe (16) and the fifth branch pipe (17). One third valve is arranged on the fourth branch pipe (16) and the fifth branch pipe (17) respectively. A fourth valve is also arranged on the second main pipe (8), and the fourth valve is located between the fourth branch pipe (16) and the fifth branch pipe (17).

7. The central vacuum system for a lithium battery factory of claim 1, wherein: It also includes a tail gas treatment device (35), and the tail gas treatment device (35) is connected with each vacuum pump (1).

8. The central vacuum system for a lithium electrotechnical plant according to claim 7, characterized in that: It also includes a cooling water inlet main pipe (23) and a cooling water outlet main pipe (24), the cooling water inlet main pipe (23) is connected with a fifth main pipe (34), the fifth main pipe (34) is connected with multiple eighth branch pipes (20), the eighth branch pipes (20) are connected with the vacuum pumps (1), and the vacuum pumps (1) are also connected with the cooling water outlet main pipe (24) through a ninth branch pipe (28). A temperature sensor (21) is arranged on the eighth branch pipe (20), and a third valve (22) is connected on the fifth main pipe (34). The temperature sensor (21) and the third valve (22) are also electrically connected with the control system (18).

9. Central vacuum system for a lithium electrotechnical plant according to claim 7 or 8, characterized in that: The vacuum pump (1) is an oil-free screw vacuum pump. It also includes a nitrogen main pipe (25), the nitrogen main pipe (25) is connected with a seventh main pipe (31), the seventh main pipe (31) is connected with multiple tenth branch pipes (32), and the tenth branch pipes (32) are connected with the vacuum pumps (1). The seventh main pipe (31) is further provided with a fourth valve (26) and a flow sensor (27), and the fourth valve (26) and the flow sensor (27) are further electrically connected with the control system (18).

10. Central vacuum system for a lithium electrotechnical plant according to claim 7 or 8, characterized in that: The vacuum pump (1) is an oil screw vacuum pump.

Images