Formation negative pressure system and battery production system

Abstract

The utility model provides a formation negative pressure system and a battery production system, and relates to the battery technical field, the formation negative pressure system comprises a negative pressure module, a control module and a plurality of negative pressure channels, the negative pressure module is connected with each negative pressure channel, and the negative pressure module is used for providing negative pressure for each negative pressure channel; each negative pressure channel is provided with a control valve, and the control module is connected with the control valves so as to control conduction of each negative pressure channel. The control module at least comprises a programmable logic controller and a plurality of intermediate relays, one end of each intermediate relay is connected with the corresponding control valve, and the other end of each intermediate relay is connected with the programmable logic controller. According to the formation negative pressure system, one control valve is additionally arranged on each negative pressure channel, the influence of faults on other channels can be avoided, the negative pressure leakage detection efficiency is improved, the control valves are automatically opened or closed by monitoring the negative pressure state of each channel in real time, and the utilization rate of the formation negative pressure channels is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a formation negative pressure system and a battery production system. Background Technology

[0002] In recent years, the booming development of the new energy industry has driven the continuous progress and widespread application of lithium-ion battery technology. In the production process of lithium-ion batteries, negative pressure formation is a crucial step that plays a vital role in improving battery performance and safety. The core of the negative pressure formation process lies in creating a negative pressure environment inside the battery to allow for the timely release of gases generated during charging and discharging, preventing gas accumulation from negatively impacting battery performance. This negative pressure environment also helps control the internal pressure environment of the battery, contributing to the stability and consistency of the SEI film on the negative electrode surface, thereby improving the overall performance and safety of the battery.

[0003] Existing negative pressure formation systems typically consist of multiple channels. During negative pressure leak detection, because these channels are interconnected, a vacuum leak in one or more channels directly affects the negative pressure state of other channels, causing the overall leak rate test to fail. In this case, all channels are deemed unqualified, the needle bed detaches, and subsequent charge-discharge tests are impossible. Furthermore, when the number of test batteries in the fixture tray is less than the number of channels, the empty tray positions require the fabrication of a corresponding number of dummy batteries to fill the gaps. This necessitates manually disabling the test flow for the corresponding channels in the host computer software, increasing operational complexity and time costs. Therefore, there is an urgent need to address the low efficiency of negative pressure leak detection caused by the interconnectedness of multiple channels in negative pressure formation systems. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a formation negative pressure system and a battery production system, which effectively solves the problem of low leakage detection efficiency caused by the interconnection of multiple channels in the existing formation negative pressure system.

[0005] In a first aspect, this utility model provides a formation negative pressure system, which includes a negative pressure module, a control module, and multiple negative pressure channels, wherein:

[0006] The negative pressure module is connected to each of the negative pressure channels, and the negative pressure module is used to provide negative pressure to each of the negative pressure channels;

[0007] Each of the negative pressure channels is equipped with a control valve, and the control module is connected to the control valve to control the conduction of each negative pressure channel.

[0008] Furthermore, the control module includes at least a programmable logic controller and a plurality of intermediate relays, wherein one end of each intermediate relay is connected to a corresponding control valve, and the other end of each intermediate relay is connected to the programmable logic controller.

[0009] Furthermore, the negative pressure module includes a negative pressure source and a proportional valve, wherein the negative pressure source is connected to the proportional valve, and the proportional valve is connected to the control module.

[0010] Furthermore, the negative pressure module also includes a vacuum valve, which is connected to the proportional valve.

[0011] Furthermore, the negative pressure module also includes a vacuum gauge, which is connected to the vacuum valve and the control module respectively.

[0012] Furthermore, the negative pressure module also includes a vacuum breaking valve, which is connected to the vacuum valve.

[0013] Furthermore, the negative pressure module also includes a gas-liquid separator, which is connected to the vacuum valve.

[0014] Furthermore, the negative pressure module also includes a manifold unit, one end of which is connected to the gas-liquid separator, and the other end of which is connected to multiple control valves.

[0015] Furthermore, each of the negative pressure channels also includes a liquid storage container, which is connected to the control valve.

[0016] Secondly, this utility model provides a battery production system, which includes the formation negative pressure system described in the first aspect of this utility model.

[0017] The formation negative pressure system provided by this utility model adds a control valve to each negative pressure channel. By opening and closing the control valve, the continuity of each negative pressure channel can be precisely controlled. Since each negative pressure channel has an independent control valve, independent control of each channel can be achieved, and the negative pressure of each channel does not affect each other. When a fault such as vacuum leakage occurs in a negative pressure channel, the fault point can be quickly isolated. Simply closing the control valve of that channel can prevent the fault from affecting other channels, thus improving the efficiency of negative pressure leak detection. At the same time, the control module can achieve more precise and automated control, monitor the negative pressure status of each channel in real time, and automatically open or close the control valve according to preset logic. This can significantly improve the utilization rate of the formation negative pressure channels, while improving the automation level, operating efficiency, and reliability of the formation negative pressure system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a first schematic diagram of the formation negative pressure system structure provided in this embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the control valve provided in an embodiment of the present invention;

[0021] Figure 3 This is a second schematic diagram of the formation negative pressure system structure provided in this embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the battery production system provided in an embodiment of the present invention.

[0023] Explanation of key component symbols:

[0024] 10. Formation negative pressure system; 20. Battery production system; 100. Negative pressure module; 110. Negative pressure source; 120. Proportional valve; 130. Vacuum valve; 140. Vacuum gauge; 150. Vacuum breaking valve; 160. Gas-liquid separator; 170. Manifold unit; 200. Negative pressure channel; 210. Control valve; 220. Liquid storage container; 300. Control module. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be further described clearly and completely below with reference to the accompanying drawings of the embodiments of this utility model. It should be noted that the described embodiments are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] In the production of lithium-ion batteries, negative pressure formation is a crucial process step that plays a vital role in improving battery performance and safety. The core of the negative pressure formation process lies in creating a negative pressure environment inside the battery to allow for the timely release of gases generated during charging and discharging, preventing gas accumulation from negatively impacting battery performance. This negative pressure environment also helps control the internal pressure environment of the battery, ensuring the stability and consistency of the SEI film on the negative electrode surface, thereby improving the overall performance and safety of the battery.

[0029] Existing negative pressure formation systems typically consist of multiple channels. During negative pressure leak detection, because these channels are interconnected, a vacuum leak in one or more channels directly affects the negative pressure state of other channels, causing the overall leak rate test to fail. In this case, all channels are deemed unqualified, the needle bed detaches, and subsequent charge-discharge tests are impossible. Furthermore, when the number of test batteries in the fixture tray is less than the number of channels, the empty tray positions require the fabrication of a corresponding number of dummy batteries to fill the gaps. This necessitates manually disabling the test flow for the corresponding channels in the host computer software, increasing operational complexity and time costs. Therefore, there is an urgent need to address the low efficiency of negative pressure leak detection caused by the interconnectedness of multiple channels in negative pressure formation systems.

[0030] Example 1

[0031] This utility model provides a formation negative pressure system, which effectively solves the problem of low detection efficiency of negative pressure leak detection caused by the interconnection of multiple channels in the formation negative pressure system. Figure 1 This is a first schematic diagram of the formation negative pressure system structure provided in this embodiment of the utility model, as shown below. Figure 1 As shown, the formation negative pressure system includes a negative pressure module 100, a control module 300, and multiple negative pressure channels 200.

[0032] A negative pressure module 100 is connected to each negative pressure channel 200, and the negative pressure module 100 is used to provide negative pressure to each negative pressure channel 200. Each negative pressure channel 200 is provided with a control valve 210, and a control module 300 is connected to the control valve 210 to control the conduction of each negative pressure channel 200. The control module 300 includes, but is not limited to, microcontrollers such as microcontroller chips, programmable logic controllers, and single-chip microcomputers.

[0033] In this embodiment of the invention, the control module 300 uses a programmable logic controller and multiple intermediate relays to control the control valve 210. Figure 2 This is a schematic diagram of the control valve provided in an embodiment of the present invention, as shown below. Figure 2 As shown, one end of each intermediate relay is connected to the corresponding control valve 210, and the other end of each intermediate relay is connected to the programmable logic controller.

[0034] Optionally, when the programmable logic controller (PLC) outputs an electrical signal Y0, this signal is sent to the coil of intermediate relay KA1. When the coil receives sufficient voltage and current, the intermediate relay KA1 coil is energized, causing its normally open contact to close, forming a conductive path. If the coil of the first control valve is connected to this path, the coil of the first control valve will receive power, driving the internal mechanical mechanism of the valve to open the valve, allowing gas or fluid in the negative pressure channel to pass through, thus achieving the conduction of the negative pressure channel. When the PLC does not output signal Y0, the PLC no longer supplies power to the coil of intermediate relay KA1, the intermediate relay KA1 coil is de-energized, and the previously closed normally open contact will reopen, cutting off the conductive path. Then the first control valve coil is de-energized, driving the internal mechanical mechanism of the valve to close the valve, preventing gas or fluid in the negative pressure channel from passing through, thus achieving the closure of the negative pressure channel.

[0035] By adding a control valve 210 to each negative pressure channel 200, and controlling the signal of the control valve 210 by the control module 300, the negative pressure channel can be selectively opened and closed. When the negative pressure channel is selected to be enabled, the coil of the control valve 210 is energized, the valve opens, and the negative pressure channel 200 is conductive. When the channel is not selected to be enabled, the coil of the control valve 210 is de-energized, the valve closes, and the negative pressure channel 200 is not conductive. In the event of vacuum leakage in a single negative pressure channel 200 or multiple negative pressure channels 200, the control valves 210 of these negative pressure channels 200 can be closed, the negative pressure channels 200 are not conductive, and the negative pressure of other negative pressure channels 200 is not affected. Thus, the negative pressure of each channel can be independently controlled without affecting each other.

[0036] As a further embodiment of this utility model, Figure 3 This is a second schematic diagram of the formation negative pressure system structure provided in this embodiment of the utility model, as shown below. Figure 3 As shown, the negative pressure module 100 includes at least a negative pressure source 110, a proportional valve 120, a vacuum valve 130, a vacuum gauge 140, a vacuum breaking valve 150, a gas-liquid separator 160, and a manifold unit 170.

[0037] During battery formation, waste gas is generated inside the battery, and electrolyte may overflow. If this waste gas and electrolyte are not removed in time, it will adversely affect the battery's production and performance. The negative pressure source 110 continuously provides an intake air source to the negative pressure channel 200. By generating negative pressure, the negative pressure source 110 extracts the waste gas and electrolyte from inside the battery, ensuring the smooth progress of the formation process. In this embodiment of the invention, the negative pressure source 110 may include a vacuum source and its related control components. The vacuum source may be a vacuum pump, which, through connection to the negative pressure channel 200, provides a stable negative pressure to the formation negative pressure system.

[0038] The proportional valve 120 is connected to both the negative pressure source 110 and the control module 300. Through PID feedback, the proportional valve 120 automatically adjusts its size to achieve the required negative pressure setpoint for the formation negative pressure system. Optionally, the proportional valve 120 can be an electro-proportional valve. The programmable logic controller (PLC) adjusts the opening value of the electro-proportional valve based on received control commands and acquires the real-time opening value of the electro-proportional valve and the real-time pressure value from the pressure gauge. After converting these analog quantities into digital quantities, the PLC verifies the real-time pressure value based on the control commands and dynamically corrects the opening value of the electro-proportional valve according to the verification results and the real-time opening value. This greatly improves the accuracy and stability of the negative pressure adjustment by the electro-proportional valve. Through reasonable PID parameter settings and precise control system design, stable and efficient operation of the formation negative pressure system can be achieved.

[0039] Vacuum valve 130 is connected to proportional valve 120. Vacuum valve 130 controls the vacuum state of negative pressure channel 200 by opening and closing. In this embodiment, vacuum valve 130 can be a vacuum solenoid valve, a control element that uses electromagnetic force to control gas flow. Its switching state can be achieved by controlling the on / off state of an electromagnet. When a negative pressure environment needs to be established or maintained, energizing the electromagnet of the vacuum solenoid valve generates a magnetic field that attracts the valve core, opening the valve. The negative pressure channel 200 then connects to the negative pressure source 110, and gas is drawn from the negative pressure channel 200 to form a negative pressure environment. When the connection between the negative pressure channel 200 and the negative pressure source 110 needs to be disconnected, disconnecting the power supply to the electromagnet of the vacuum solenoid valve causes the magnetic field to disappear. The valve core returns to its original position under the action of a spring or other reset mechanism, closing the valve. Because the passage between the negative pressure channel 200 and the negative pressure source 110 is cut off, the negative pressure environment within the channel is maintained or gradually dissipates.

[0040] Vacuum gauge 140 is connected to vacuum valve 130 and control module 300. Vacuum gauge 140 detects the vacuum pressure value between negative pressure source 110 and negative pressure channel 200 and provides a feedback signal. Vacuum gauge 140 is typically connected to the channel via a hose or pipe to ensure accurate measurement of the vacuum pressure value within the channel. When the negative pressure system starts operating, vacuum gauge 140 displays the vacuum pressure value within the channel in real time. Operators can determine whether the negative pressure system is operating normally by observing the reading on vacuum gauge 140. Vacuum gauge 140 can also convert the detected vacuum pressure value into an electrical signal and transmit it to control module 300 for real-time monitoring, recording, and analysis of the negative pressure system's operating status. Based on preset thresholds or conditions, control module 300 can automatically take corresponding measures, such as adjusting the output of the negative pressure source and issuing alarm prompts.

[0041] Vacuum breaker valve 150 is connected to vacuum valve 130. Vacuum breaker valve 150 is used to release pressure from the vacuum negative pressure channel 200. Optionally, vacuum breaker valve 150 can be a vacuum breaker solenoid valve. When pressure release is required, the valve can be opened by controlling the energization of the vacuum breaker solenoid valve, so that the vacuum negative pressure channel is connected to the atmosphere, thereby achieving pressure release.

[0042] The gas-liquid separator 160 is connected to the vacuum valve 130. The gas-liquid separator 160 is used to separate the gas and electrolyte generated during the process of creating negative pressure, and discharge the separated electrolyte into the container of the gas-liquid separator through a manual valve.

[0043] One end of the manifold unit 170 is connected to the gas-liquid separator 160, and the other end of the manifold unit 170 is connected to multiple control valves 210. The manifold unit 170 is used to convert negative pressure flow and divide one negative pressure path into multiple negative pressure channels. In this embodiment of the present invention, two manifold units 170 are used to divide one negative pressure path into 16 negative pressure channels.

[0044] In this embodiment of the invention, each negative pressure channel 200 further includes a liquid storage container 220, which is connected to the control valve 210. Optionally, the liquid storage container 220 can be a negative pressure cup, which is used to temporarily store the liquid electrolyte extracted during the negative pressure formation process. After the negative pressure channel is depressurized, the electrolyte stored in the cup is returned to the battery, so that the electrolyte volume of the battery remains basically consistent and the loss of battery electrolyte is avoided.

[0045] In this embodiment of the invention, the working process of the negative pressure formation system is as follows: After the host computer sets the required negative pressure target value, the programmable logic controller (PLC) calculates the accurate analog quantity, and then sends it to the proportional valve for PID control via the analog output module. Simultaneously, the vacuum solenoid valve opens, and the vacuum gauge detects the pressure in the negative pressure path and feeds back a signal to the PLC for adjustment and control. This achieves high-precision control of the negative pressure extraction within the closed loop of the negative pressure formation system, accurately reaching the set target negative pressure value. During the negative pressure formation process, the vacuum sequentially passes through the gas-liquid separator, manifold unit, control valve, negative pressure cup, and suction nozzle in the negative pressure path to extract the gas generated by the battery. After formation is complete, the vacuum solenoid valve and proportional valve are closed sequentially, and then the vacuum breaking solenoid valve is opened to depressurize the negative pressure path to 0.

[0046] The formation negative pressure system provided by this utility model adds a control valve to each negative pressure channel. By opening and closing the control valve, the continuity of each negative pressure channel can be precisely controlled. Since each negative pressure channel has an independent control valve, independent control of each channel can be achieved, and the negative pressure of each channel does not affect each other. When a fault such as vacuum leakage occurs in a negative pressure channel, the fault point can be quickly isolated. Simply closing the control valve of that channel can prevent the fault from affecting other channels, thus improving the efficiency of negative pressure leak detection. At the same time, the control module can achieve more precise and automated control, monitor the negative pressure status of each channel in real time, and automatically open or close the control valve according to preset logic. This can significantly improve the utilization rate of the formation negative pressure channels, while improving the automation level, operating efficiency, and reliability of the formation negative pressure system.

[0047] Example 2

[0048] Based on the same technical concept, this utility model embodiment provides a battery production system. Figure 4 This is a schematic diagram of the battery production system structure provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the battery production system includes the formation negative pressure system 10 in Example 1 above.

[0049] The negative pressure system of this battery production system enables independent control of each channel, with the negative pressure of each channel remaining unaffected. It can monitor the negative pressure status of each channel in real time and automatically open or close control valves according to preset logic, significantly improving the utilization rate of the negative pressure channels. This battery production system can discharge waste gas and electrolyte from individual battery cells, preventing the accumulation of waste gas that could lead to explosions or other dangerous situations. It also avoids contaminating the internal environment of the battery, ensuring normal operation and long-term stability, and effectively improving battery performance and cycle life.

[0050] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A negative pressure conversion system, characterized in that, The formation negative pressure system includes a negative pressure module, a control module, and multiple negative pressure channels, wherein: The negative pressure module is connected to each of the negative pressure channels, and the negative pressure module is used to provide negative pressure to each of the negative pressure channels; Each of the negative pressure channels is equipped with a control valve, and the control module is connected to the control valve to control the conduction of each negative pressure channel.

2. The negative pressure system for formation according to claim 1, characterized in that, The control module includes at least a programmable logic controller and a plurality of intermediate relays, wherein one end of each intermediate relay is connected to a corresponding control valve, and the other end of each intermediate relay is connected to the programmable logic controller.

3. The negative pressure system for formation according to claim 1, characterized in that, The negative pressure module includes a negative pressure source and a proportional valve, wherein the negative pressure source is connected to the proportional valve, and the proportional valve is connected to the control module.

4. The negative pressure system for formation according to claim 3, characterized in that, The negative pressure module also includes a vacuum valve, which is connected to the proportional valve.

5. The negative pressure system for formation according to claim 4, characterized in that, The negative pressure module also includes a vacuum gauge, which is connected to the vacuum valve and the control module respectively.

6. The negative pressure system for formation according to claim 4, characterized in that, The negative pressure module also includes a vacuum breaking valve, which is connected to the vacuum valve.

7. The negative pressure system for formation according to claim 6, characterized in that, The negative pressure module also includes a gas-liquid separator, which is connected to the vacuum valve.

8. The negative pressure system for formation according to claim 7, characterized in that, The negative pressure module also includes a manifold unit, one end of which is connected to the gas-liquid separator, and the other end of which is connected to multiple control valves.

9. The formation negative pressure system according to any one of claims 1-8, characterized in that, Each of the negative pressure channels also includes a liquid storage container, which is connected to the control valve.

10. A battery production system, characterized in that, The battery production system includes the formation negative pressure system as described in any one of claims 1-9.

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