Battery resting system

Abstract

This application makes public a battery resting system, comprising: at least two resting tanks, the resting tanks being used to place the battery cells; a main gas supply module, respectively connected to each resting tank, and used to supply nitrogen gas to the resting tanks; a gas evacuation module, respectively connected to each resting tank, and used to vent the nitrogen gas present in the resting tanks into the air; a recovery module, respectively connected to each resting tank, and used to recover the nitrogen gas evacuated from each resting tank; a vacuum module, respectively connected to each resting tank, and used to evacuate the resting tanks; and at least one connecting conduit, the connecting conduits connecting the respective recovery modules of two resting tanks, and used to supply nitrogen gas between two resting tanks.

Description

Title of the invention: Battery resting system technical field

[0001] The present application relates to the technical field of batteries, and in particular a battery resting system. State of the art

[0002] The lithium-ion battery manufacturing and production process includes a liquid injection and curing process. Once the liquid injection is complete, the battery cells are placed in a curing tank which undergoes repeated pressurization and vacuum cycles to ensure that the electrolyte fully saturates the wound core. During the pressurization process, nitrogen gas is injected into the curing tank to enhance the pressure effect.

[0003] Once the pressure process is complete, the nitrogen gas present in the settling tank is recovered via a recovery tank. Once the gas pressure between the recovery tank and the settling tank is equalized, the residual nitrogen gas from the settling tank is expelled. Since the recovery tank itself operates at atmospheric pressure, the recovery rate of the nitrogen gas expelled from the settling tank is low, resulting in excessive waste.

[0004] Content of the invention

[0005] A stationary battery system, based on one or more embodiments of the present application, comprising: at least two rest tanks, a main gas supply module, a gas evacuation module, a recovery module, a vacuum module and at least one connecting conduit.The said resting tanks are used to house the battery cells; the said main gas supply module is respectively connected to each of the said resting tanks, and serves to supply nitrogen gas to the said resting tanks; the said gas evacuation module is respectively connected to each of the said resting tanks, and serves to vent the nitrogen gas present in the said resting tanks into the air; the said gas recovery module is respectively connected to each of the said resting tanks, and serves to recover the nitrogen gas evacuated from each of the said resting tanks; the said vacuum module is respectively connected to each of the said resting tanks, and serves to evacuate the said resting tanks; and each of the said connecting conduits connects the respective recovery modules of the said two resting tanks, and serves to supply nitrogen gas between the said two resting tanks.

[0006] Said battery resting system has the following technical effects:

[0007] By supplying nitrogen gas to the holding tanks via the main gas supply module, recovering the nitrogen gas from the holding tanks via the gas recovery module, and evacuating the holding tanks via the vacuum module, the cyclic process of pressurizing and evacuating the holding tanks is completed. By connecting the recovery modules of each of the two holding tanks using connecting lines, when one holding tank is at high pressure and requires pressure relief while the other tank is at low pressure and requires pressure increase, the gas from the high-pressure holding tank can be transferred to the low-pressure holding tank. Since the pressure in the low-pressure holding tank is lower than the pressure in the recovery tank, the gas evacuated from the high-pressure holding tank can be recovered.Thus, the gas can be fully utilized, increasing the gas utilization rate and reducing production costs.

[0008] Description of the accompanying figures

[0009] Fig. 1 represents the structural diagram of the battery resting system of the embodiment based on the present application.

[0010] In the Figure: 100-battery resting system, 10-resting tank, 11-inlet and outlet pipes, 20-connecting pipes, 30-main gas supply module, 31-main storage tank, 32-main gas supply line, 33-secondary gas supply line, 34-pressure boosting pump, 40-gas venting module, 41-main gas vent line, 42-secondary gas vent line, 50-recovery module, 51-recovery tank, 52-main recovery line, 53-secondary recovery line, 54-first filter, 55-pressure sensor, 56-flow meter, 57-second ball valve, 60-vacuum module, 61-buffer tank, 62-main vacuum line, 63-secondary vacuum line, 70-first ball valve, 80-auxiliary gas supply module, 81-auxiliary storage tank, 82-non-return valve, 90-second filter, 200-third ball valve, 300-silencer.

[0011] Embodiments

[0012] A detailed description of the technical content, structural features, purpose achieved, and effects of this application, combined with the accompanying figure, is given below. Specifically, the terminology used in the embodiments of this application serves only to describe specific embodiments and not to limit the scope of this application.

[0013] Figure 1 represents the battery resting system 100 based on the present application; said battery resting system 100 comprises at least two resting tanks 10, a connecting conduit 20, a main module of gas supply 30, a gas evacuation module 40, a recovery module 50 and a vacuum module 60.

[0014] In which the resting tanks 10 are used to place the battery cells, the resting tanks 10 are arranged side by side; the main gas supply module 30 is respectively connected to each resting tank 10, and serves to supply nitrogen gas into the resting tanks 10; the gas evacuation module 40 is respectively connected to each resting tank 10, and serves to evacuate the nitrogen gas present in the resting tanks 10 into the air; the gas recovery module 50 is respectively connected to each resting tank 10, and serves to recover the nitrogen gas evacuated from each resting tank 10; the vacuuming module 60 is respectively connected to each resting tank, and serves to evacuate the resting tanks 10; and the connecting conduits 20 connect the respective recovery modules 50 of the two rest tanks 10, and serve to convey the nitrogen gas between the two rest tanks 10.

[0015] The aforementioned settling system 100 supplies nitrogen gas to the settling tanks 10 via the main gas supply module 30, recovers the nitrogen gas evacuated from the settling tanks 10 via the gas recovery module 50, and evacuates the settling tanks 10 via the evacuation module 60, in order to carry out the cyclic process of pressurizing and evacuating the settling tanks 10. Thanks to the connection of the recovery modules 50 of each of the two settling tanks 10 by means of connecting conduits 20, when one settling tank 10 is at high pressure and it is necessary to carry out a pressure relief while the other tank is at low pressure and it is necessary to increase the pressure, the gas from the settling tank 10 at high pressure can be evacuated to the settling tank 10 at low pressure.Since the pressure in the low-pressure rest tank 10 is lower than the pressure in the recovery tank 51 of the recovery module 50, the gas discharged from the high-pressure rest tank 10 can be recovered. Thus, the gas can be fully utilized, increasing the gas utilization rate and reducing production costs.

[0016] Wherein, when the aforementioned connecting conduits 20 are connected to the resting tanks 10, they can be used to connect two adjacent resting tanks 10, which facilitates the connection of the connecting conduits 20 and the resting tanks 10. The present application, however, is not limited to this; in other embodiments, the connecting conduits 20 can also, depending on the requirements, connect two resting tanks 10 which are not adjacent.

[0017] The resting tanks 10 of [Fig.1] are connected to inlet and outlet conduits 11, the inlet and outlet conduits 11 are connected via a plurality of inlet and outlet valves to the main gas supply module 30, the gas evacuation module 40, the recovery module 50 and the vacuum module 60.

[0018] Wherein, the recovery module 50 comprises a recovery tank 51, a main recovery duct 52 and at least two secondary recovery ducts 53. The secondary recovery ducts 53 are arranged correspondingly to the resting tanks 10, and are each connected between the main recovery duct 52 and the corresponding resting tank 10, the main recovery duct 52 is connected to the recovery tank 51. Thus, when nitrogen gas is to be recovered, the nitrogen gas flows into the secondary recovery duct 53 via the inlet and outlet duct 11, and flows to the main recovery duct 52 following the secondary recovery duct 53, it then enters the recovery tank 51, the recovery of the nitrogen gas is then carried out from the recovery tank 51, which facilitates its subsequent use.

[0019] Furthermore, in order to guarantee the degree of purity of the nitrogen gas in the recovery tank 51, and to guarantee its resting effects on the electrolyte during subsequent uses, the battery resting system 100 further includes an auxiliary gas supply module 80. The auxiliary gas supply module 80 is connected to the recovery module 50, and serves to supply nitrogen gas to the recovery module 50. Specifically, the auxiliary gas supply module 80 is connected to the recovery tank 51, and replenishes the recovery tank 51 with nitrogen gas, so that the degree of purity of the nitrogen gas in the recovery tank 51 is sufficient, facilitating the subsequent use of the nitrogen gas from the recovery tank 51.

[0020] Furthermore, during gas recovery, a portion of the electrolyte leaves the settling tank 10. In order to recover the electrolyte, the recovery module 50 further includes a first filter 54. The first filter 54 is arranged on the main recovery line 52, so that when nitrogen gas is recovered, the nitrogen gas flowing from the settling tank 10 passes through the first filter 54 to be filtered, which allows the electrolyte and nitrogen gas to be completely separated, guaranteeing the degree of purity of the recovered nitrogen gas, and facilitating the recovery of the electrolyte.

[0021] Specifically, the auxiliary gas supply module 80 comprises an auxiliary storage tank 81 and a non-return valve 82. The non-return valve 82 is arranged between the auxiliary storage tank 81 and the recovery module 50, i.e., thanks to the arrangement of the non-return valve 82, the additional gas added to the auxiliary storage tank 81 can only flow in one direction towards the recovery tank 51, which prevents the gas from the recovery tank 51 from flowing in the opposite direction towards the auxiliary storage tank 81.

[0022] In which, the main gas supply module 30 comprises a main storage tank 31, a main gas supply conduit 32 and at least two auxiliary gas supply conduits 33. The auxiliary supply conduits of The gas 33s are arranged correspondingly to the resting tanks 10, and each is connected between the main gas supply line 32 and the corresponding resting tank 10. The main gas supply line 32 is connected to the main storage tank 31, so nitrogen gas is stored in the main storage tank 31. When the resting tank 10 requires a pressure increase, nitrogen gas is supplied via the main storage tank 31 to achieve the pressure increase.

[0023] It must be understood that, depending on the pressure size of the plant gas source, the main gas supply module 30 may further include a pressure boosting pump 34, the pressure boosting pump 34 is connected between the opening of the plant gas source and the main storage tank 31, and can provide a gas source of sufficient pressure to the main storage tank 31.

[0024] In which, the vacuum module 60 comprises a buffer tank 61, a main vacuum line 62, and at least two auxiliary vacuum lines 63. The auxiliary vacuum lines 63 are arranged correspondingly to the holding tanks 10 and are each connected between the main vacuum line 62 and the corresponding holding tank 10. The main vacuum line 62 is connected to the buffer tank 61, so that when the holding tank 10 needs to be evacuated, a vacuum must first be achieved between the factory vacuum source and the buffer tank 61, in order to increase the length of the line during the subsequent evacuation of the holding tank 10, thereby increasing the vacuum efficiency.

[0025] It must be understood that in order to prevent, during the process of evacuating gas from the high-pressure resting tanks 10 to the recovery tanks 51, too much nitrogen gas from simultaneously entering the connecting pipes 20 and from having residual gas in the connecting pipes 20, the battery resting system 100 further comprises at least one first ball valve 70. The first ball valve 70 is arranged on the connecting pipe 20, so that the opening and closing of the connecting pipe 20 are controlled by the first ball valve 70, which makes it possible to prevent, during the evacuation of gas from the high-pressure resting tanks 10 to the recovery tanks 51, nitrogen gas from simultaneously entering the connecting pipes 20 and from having too much residual gas.

[0026] In one embodiment of the present application, in order to protect the recovery module 50, the recovery module 50 further comprises a pressure sensor 55. The pressure sensor 55 is arranged on the main recovery line 52, serving to detect the pressure of the main recovery line 52. Thus, it is possible to monitor in real time the pressure of the gas flowing in the main recovery conduit 52 thanks to the pressure sensor 55, and to prevent that when the gas evacuation speed is too fast it generates too much pressure on the main recovery conduit 52 and constitutes a potential danger of cracking.

[0027] In addition, the recovery module 50 further includes a flow meter 56. The flow meter 56 is arranged on the main recovery line 52 and serves to measure the flow rate of gas passing through the main recovery line 52 to enter the recovery tank 51. Thus, by monitoring the volume of gas flowing in the main recovery line 52 by the flow meter 56, it is possible to determine whether the volume of gas reaches the predefined recovery value.

[0028] Furthermore, the recovery module 50 of this embodiment further includes a second ball valve 57. The second ball valve 57 is arranged on the main recovery conduit 52, and serves to open or close the main recovery conduit 52. Thus, the opening and closing of the main recovery conduit 52 by the second ball valve 57 makes it possible, when it is necessary to inject gas into the connecting conduits 20, to prevent it from being discharged through the main recovery conduit 52, guaranteeing the effects of discharge and pressure increase between the two rest tanks 10.

[0029] In which, the gas venting module 40 of this embodiment further comprises a main gas venting duct 41 and at least two auxiliary gas venting ducts 42. The auxiliary gas venting ducts 42 correspond one by one to the holding tanks 10, and are each connected to the corresponding holding tank 10, and serve to guide the gas from the holding tanks 10 to the main gas venting duct 41, in order to vent it into the air via the main gas venting duct 4L

[0030] In which, in order to avoid excessive gas residues in the secondary recovery duct 53, the auxiliary gas supply ducts 33, the auxiliary vacuum ducts 63 and the auxiliary gas evacuation ducts 42, a third ball valve 200 is arranged on the secondary recovery duct 53, the auxiliary gas supply ducts 33, the auxiliary vacuum ducts 63 and the gas evacuation module 40, the control of the recovery module 50, the vacuum module 60 and the gas evacuation module 40 being ensured by each ball valve.

[0031] In one embodiment of the present application, in order to ensure the degree of purity of the nitrogen gas entering or flowing from the resting tanks 10, the battery resting system 100 further comprises at least two second filters 90, a second filter 90 being arranged on the inlet and outlet ducts 11 of each resting tank 10. Thus, when the gas flows from the resting tank 10, it is first filtered by the second filter 90, so that the electrolyte is recovered, while preventing an excessive volume of gas from entering the recovery tank 51 or the buffer tank 61 when the nitrogen gas is recovered in the recovery tank 51 or the buffer tank 61; or when it is necessary for the nitrogen gas from the recovery tank 51 or the buffer tank 61 to enter the rest tank 10, it is first filtered by the second filter 90, thus guaranteeing the degree of purity of the nitrogen gas entering the rest tank 10.

[0032] In addition, the battery resting system 100 further includes at least two silencers 300. The silencers 300 are arranged in correspondence one by one to the inlets and outlets of the resting tanks 10, the silencers 300 make it possible to reduce the parasitic noise produced by the inlet and outlet of the gas from the resting tanks 10, and thus to reduce the noise pollution of the environment.

[0033] The method of using the aforementioned connecting conduit 20 is described below. In order to simplify the description, the present embodiment is assumed to include two resting tanks 10, the two resting tanks 10 being respectively the first tank body and the second tank body, the first tank body is defined as being at high pressure and the second tank body is defined as being at low pressure and requiring a pressure increase (the pressure being about 0). The initial pressure of the first tank body is PI, the volume is V, the volume of the second tank body is V, the volume of the recovery tank 51 is V0 = V3, and defined as PI = 0.8 MP;

[0034] (1) when the first tank body performs a pressure discharge via the conduit From connection 20 to the second tank body, their equilibrium pressures are all P2. At this point, P2 = Pl / 2 = 0.8 / 2 = 0.4 MPa. Therefore, before and after pressure relief to the second tank body, the ratio of the quantity of gas in the first tank body is PI : P2 = 2 : 1, resulting in a gas recovery rate from the first tank body of (2 - 1) / 2 = 50%.

[0035] (2) when the high-pressure gas from the first tank body is directly evacuated By the recovery module 50, to increase the gas recovery efficiency, the volume of the recovery tank 51 must be greater than the volume of the resting tank 10. The recovery tank 51 has an initial pressure of P2. Assuming the initial pressure is P2 = 0.4 MPa, the pressure of the gas discharged from the first tank body after reaching the recovery tank 51 is P3. Thus, from P1V + P2V0 = P3*(V + V0), we obtain P3 = 0.5 MPa. Therefore, before and after the gas is discharged to the recovery tank 51, the ratio of the quantity of gas in the first tank body is: PI : P3 = 8 : 5. The gas recovery rate at this point is (8 - 5) / 8 = 37.5%, which is lower than the rate recovery of the mutual evacuation mode of gas from the two aforementioned rest tanks 10.

[0036] (3) once the high-pressure gas from the first tank body has been evacuated via the connecting conduit 20 to the second tank body, and the residual nitrogen gas has been vented into the air via the gas vent module 40, a vacuum is carried out using the vacuum module 60, thus the first tank body has carried out a pressurization and vacuum process in one step.

[0037] The aforementioned plan in which a connecting conduit 20 is arranged between the rest tanks 10 increases the gas recovery rate, and therefore reduces production costs.

[0038] Although these are considered to be the most practical preferred embodiments describing the content of this application, it should nevertheless be understood that the content of this application is not limited to the publicly disclosed embodiments, but aims to cover all possible combinations that do not deviate from the scope of the attached claims in their broadest sense.

Claims

Demands

1. Battery resting system (100), characterized in that it comprises: at least two of said resting tanks (10), each of said resting tanks (10) being used to hold battery cells; a main gas supply module (30), respectively connected to each of said resting tanks (10), and used to supply nitrogen gas into said resting tanks (10); a gas evacuation module (40), respectively connected to each of said resting tanks (10), and used to vent the nitrogen gas present in said resting tanks (10) into the air; a gas recovery module (50), respectively connected to each of said resting tanks (10), and used to recover the nitrogen gas vented from each of said resting tanks (10); a vacuum module (60), respectively connected to each of the said resting tanks (10), and used to vacuum each of the said resting tanks (10);at least one connecting conduit (20), said connecting conduits (20) connect the respective recovery modules (50) of two of said rest tanks (10), and serve to convey nitrogen gas between said two rest tanks (10).;

2. Battery resting system (100) according to claim 1, characterized in that said battery resting system (100) further comprises at least one first ball valve (70), said first ball valve is arranged on the connecting conduit (20).

3. Battery resting system (100) according to claim 1 or 2, characterized in that said battery resting system (100) further comprises an auxiliary gas supply module (80), said auxiliary gas supply module (80) is connected to said recovery module (50), and serves to deliver nitrogen gas to said recovery module (50).

4. Battery resting system (100) according to claim 3, characterized in that said auxiliary gas supply module (80) comprises an auxiliary storage tank (81) and a non-return valve (82), said non-return valve (82) is arranged between said auxiliary storage tank (81) and said recovery module (50), and serves to ensure that said nitrogen gas flows only in the direction from said auxiliary storage tank (81) to said recovery module (50).

5. Battery resting system (100) according to any one of claims 1-4, characterized in that said recovery module (50) comprises a recovery tank (51), a main recovery conduit (52) and at least two secondary recovery conduits (53), said secondary recovery conduits (53) are arranged in correspondence one by one with said resting tanks (10), and are each connected between said main recovery conduit (52) and said corresponding resting tank (10), said main recovery conduit (52) is connected to said recovery tank (51); and said recovery module (50) further comprises a first filter (54), said first filter (54) is arranged on said main recovery conduit (52).

6. Battery resting system (100) according to claim 5, characterized in that said recovery module (50) further comprises a pressure sensor (55), said pressure sensor (55) is arranged on said main recovery conduit (52), and serves to detect the pressure of the main recovery conduit (52).

7. Battery resting system (100) according to claim 5 or 6, characterized in that said recovery module (50) further comprises a flow meter (56), said flow meter (56) is arranged on said main recovery conduit (52) and serves to measure the flow rate of gas passing through said main recovery conduit (52) to enter said recovery tank (51).

8. Battery resting system (100) according to any one of claims 5-7, characterized in that said recovery module (50) further comprises a second ball valve (57), said second ball valve (57) is arranged on said main recovery conduit (52), and serves to open or close said main recovery conduit (52).

9. Battery resting system (100) according to any one of claims 1-8, characterized in that said battery resting system (100) further comprises at least two second filters (90), a second filter (90) is arranged on the inlet and outlet conduits (11) of each of said resting tanks (10).

10. Battery resting system (100) according to any one of claims 1-8, characterized in that said battery resting system (100) further comprises at least two silencers (300), said silencers (300) are arranged in correspondence one by one to the inlets and outlets of said resting tanks (10).

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