Formation cabinet capable of maintaining high-temperature uniformity

Abstract

The utility model discloses a formation cabinet capable of maintaining high-temperature uniformity, which is characterized in that an air cavity is communicated with a formation chamber, a power supply chamber is provided with a power supply assembly for supplying power to a battery cell entering a press cavity of the formation chamber, and the air cavity is provided with an air inlet fan and a heating module for controlling the temperature of airflow input into the formation chamber through an air inlet plate assembly; the fan assembly arranged at the top of the pressing machine cavity is used for downward airflow inflow, the temperature consistency of all the battery cells in the whole formation process stage is ensured, the environment temperature detector is arranged in the pressing machine cavity to detect the environment temperature of the pressing machine cavity, the battery cell temperature detector is arranged to detect the temperature of the battery cells, and the battery cell temperature is obtained and output. Temperature feedback is detected, uniform temperature regulation is carried out in real time, temperature control is timely, inertia is small, the environment in the formation cabinet rapidly reaches the target environment temperature range in the preheating stage, temperature uniformity is kept in the heat preservation stage, formation quality is guaranteed, and battery performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery formation equipment, in particular to a formation cabinet capable of maintaining high-temperature uniformity. Background Art

[0002] Formation is the process of performing the first charge on the battery after injection and shelving during the battery manufacturing process to form a solid electrolyte film. The charging process is to rectify the AC mains by a power supply module and then charge the battery cells, and this process is accompanied by heat loss phenomena in the power supply module and power lines.

[0003] For different formation processes, slightly different SEI films will be formed, and the morphology of the SEI film will directly affect the performance of single cells, such as rate performance, high charge, and service life. If formation is carried out at a high temperature, the reaction of the SEI film layer on the electrode surface can be made more sufficient, and the temperature uniformity will affect the formation consistency of the battery.

[0004] Regarding the selection and arrangement of the power supply module of the formation cabinet, in the prior art, the AC mains is rectified and stepped down for charging the battery cells, and the arrangement method mostly uses split cabinets. The existing defects are: the power line is too long, the internal resistance is large, and when a large current passes through the power line, heat is generated, resulting in too much useless work.

[0005] Regarding the temperature control in the formation process, there are various methods:

[0006] High-temperature aging chamber, which raises the temperature of the factory environment where the formation cabinet is located to the ideal temperature. The disadvantage is high energy consumption and low efficiency;

[0007] Hydrothermal formation cabinet, which introduces hot water into the heat exchangers on both sides of the cabinet body, and uses a fan to heat the internal air through the heat exchangers to raise the temperature inside the cabinet. The disadvantage is that it is necessary to arrange water pipes in a large area of the factory building, the hot water loses heat during the flowing process, and the temperature cannot be controlled efficiently;

[0008] Constant-temperature formation cabinet, which arranges armored heating rods on the top of the cabinet body to heat the air inside the cabinet, and uses a centrifugal fan to make the hot air achieve internal circulation. The disadvantage is that the heating rods are arranged too far away, the temperature control inertia is high, and the temperature uniformity cannot be guaranteed.

[0009] Therefore, how to reduce losses and meet the temperature requirements during the formation process, so as to improve efficiency and reduce costs, is one of the key tasks of those skilled in the art. Summary of the Utility Model

[0010] The purpose of the utility model is to provide a formation cabinet capable of maintaining high-temperature uniformity. Air chambers are arranged on both sides of the cabinet body, preheating is carried out by a fan and a heating rod, the heat generated by the power supply module is used for heat preservation during the formation process, and the temperature uniformity inside the cabinet is ensured by coordinately controlling the on-off of the fan and the power of the heating rod.

[0011] To solve the above technical problems, an embodiment of the present utility model provides a formation cabinet capable of maintaining high-temperature uniformity. The formation cabinet capable of maintaining high-temperature uniformity includes a formation chamber, a wind cavity, a power supply chamber, and a controller. The wind cavity is provided with an intake fan, a heating module, and an air inlet plate assembly. The intake fan is located outside the wind cavity and is used to communicate with the external environment through a fan air inlet and introduce external air into the wind cavity through the fan air inlet. The heating module is arranged inside the wind cavity and is used to heat the air in the wind cavity. The air inlet plate assembly is located inside the wind cavity. The wind cavity introduces air flow into the formation chamber through the ventilation holes of the air inlet plate assembly, and downward air flow is introduced into the formation chamber through a top fan assembly arranged in a press cavity of the formation chamber. The press cavity is provided with an ambient temperature detector for detecting the ambient temperature of the press cavity. A power supply assembly is installed in the power supply chamber and is used to supply power to the battery cells in the press cavity of the formation chamber. A battery cell temperature detector arranged in the formation chamber detects the temperature of the battery cells and obtains and outputs the battery cell temperature. The controller is used to control the operating parameters of the intake fan and the heating module according to the formation stage of the battery cells, the ambient temperature, and the battery cell temperature after the battery cell tray assembly enters the press cavity.

[0012] Among them, the power supply chamber is arranged on the top of the formation chamber. The power supply chamber is provided with a power module cavity for installing the power supply assembly. The power supply assembly is arranged on the bottom plate of the power module cavity. A top sealing plate is arranged on the top of the power module cavity. The top sealing plate is provided with a plurality of punched louvers for dissipating heat from the power supply assembly.

[0013] Among them, it further includes a built-in fan arranged at one end of the power supply assembly. The built-in fan penetrates through the bottom plate and is used to bring the heat generated by the power supply assembly to the press cavity. The built-in fan is connected to the controller. The controller is used to control the operating parameters of the built-in fan according to the formation stage of the battery cells.

[0014] Among them, the controller is a single-chip microcomputer controller or a PLC controller. The power supply chamber is provided with a PLC control cavity, an electric control cavity, and a data acquisition card cavity. The electric control cavity is provided with a middle computer and a circuit breaker. When the controller is a PLC controller, the PLC control cavity is provided with the PLC controller, a relay, and an adjustable switching power supply. The data acquisition card cavity is installed with a temperature acquisition module for collecting the ambient temperature of the press cavity through the ambient temperature detector and the surface temperature of the battery cells through the battery cell temperature detector. The middle computer is used to send a control signal to the PLC component of the PLC controller after receiving a control instruction, control the heating state of the heating module through the PLC component to control the adjustable switching power supply, and control the operating state of the intake fan through the relay.

[0015] Among them, the air inlet plate assembly includes an air plate and a wind shielding plate arranged at the outlet of the ventilation holes of the air plate. The upper end of the wind shielding plate is hinged to the outside of the top of the ventilation holes. The wind shielding plate is a metal sheet wind shielding plate or a ceramic sheet wind shielding plate. The width of the middle part of the wind shielding plate is greater than that of the upper part and the lower part, which is used to achieve unidirectional ventilation.

[0016] Among them, a plurality of the ventilation holes are arrayed and distributed on the main body of the air inlet plate assembly. The shapes and sizes of the plurality of ventilation holes are the same. The ventilation holes are rectangular ventilation holes or circular ventilation holes.

[0017] Among them, it further includes a parameter setting module arranged outside the power supply chamber, which is used to set the temperature threshold range of the press cavity in the preheating stage and the heat preservation stage, as well as the operating parameters of the corresponding heating module, inlet air fan, and built-in fan.

[0018] Among them, it further includes a battery cell tray assembly, a probe assembly, a lifting mechanism assembly, a negative pressure suction nozzle, a smoke sensor, and a fire fighting pipe arranged in the press cavity. The battery cell tray assembly is used to carry the battery cells undergoing formation treatment. The negative pressure suction nozzle is arranged on the battery cell tray assembly and is used to adsorb the battery cells undergoing formation treatment. The smoke sensor is used to detect smoke in the press cavity. The fire fighting pipe is used to carry out fire fighting treatment after a fire occurs in the press cavity. The probe assembly is used to connect the electrodes of the battery cells and is powered by the power supply assembly.

[0019] Among them, it further includes a sheet metal cavity arranged on the wall surface of the press cavity and a heat preservation cotton layer filled in the sheet metal cavity, which is used to thermally isolate the press cavity from the external environment.

[0020] Among them, it further includes at least one through hole arranged at the bottom of the press cavity and a polyurethane sponge layer covering the through hole, which is used to prevent overpressure in the press cavity.

[0021] Compared with the prior art, the formation cabinet capable of maintaining high-temperature uniformity provided by the embodiments of the present invention has the following advantages:

[0022] The formation cabinet capable of maintaining high-temperature uniformity provided by the embodiment of the present utility model is provided with a wind cavity communicated with the formation chamber, and a power supply chamber is installed with a power supply component to supply power to the battery cells in the press cavity entering the formation chamber. The wind cavity is provided with an intake fan and a heating module to control the temperature of the air flow input into the formation chamber through the air inlet plate assembly. The fan assembly arranged at the top of the press cavity conducts air flow downward to ensure the temperature consistency of each battery cell during the entire formation process. An ambient temperature detector is arranged in the press cavity to detect the ambient temperature of the press cavity, and a battery cell temperature detector is arranged to detect the temperature of the battery cell and obtain and output the battery cell temperature. The detected temperature is fed back to perform real-time temperature equalization control, with timely temperature control and small inertia, achieving that the internal environment of the formation cabinet quickly reaches the target ambient temperature range during the preheating stage and maintaining temperature uniformity during the heat preservation stage, ensuring the quality of formation and improving the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a front view structural schematic diagram of an embodiment of the formation cabinet capable of maintaining high-temperature uniformity provided by the present utility model;

[0025] Figure 2 It is a top view structural schematic diagram of an embodiment of the formation cabinet capable of maintaining high-temperature uniformity provided by the present utility model;

[0026] Figure 3 It is a left view structural schematic diagram of the wind cavity of an embodiment of the formation cabinet capable of maintaining high-temperature uniformity provided by the present utility model;

[0027] Figure 4 It is a front view structural schematic diagram of the wind cavity of an embodiment of the formation cabinet capable of maintaining high-temperature uniformity provided by the present utility model;

[0028] Among them, 1 - power supply chamber, 11 - power module cavity, 111 - power supply component, 112 - built-in fan, 12 - electric control cavity, 13 - PLC control cavity, 14 - acquisition card cavity, 141 - temperature acquisition module, 15 - top sealing plate, 2 - formation chamber, 21 - press cavity, 211 - top fan assembly, 212 - ambient temperature probe, 213 - battery cell temperature probe, 214 - battery cell tray assembly; 22 - wind cavity, 221 - intake fan, 222 - heating module, 223 - air inlet plate assembly, 224 - air plate, 225 - wind shielding plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figures 1 - 4 , Figure 1 which is a front view structural schematic diagram of an embodiment of the formation cabinet capable of maintaining high-temperature uniformity provided by the present invention; Figure 2 which is a top view structural schematic diagram of an embodiment of the formation cabinet capable of maintaining high-temperature uniformity provided by the present invention; Figure 3 which is a left side view structural schematic diagram of the air chamber of an embodiment of the formation cabinet capable of maintaining high-temperature uniformity provided by the present invention;

[0031] Figure 4 which is a front view structural schematic diagram of the air chamber of an embodiment of the formation cabinet capable of maintaining high-temperature uniformity provided by the present invention.

[0032] In a specific embodiment, the formation cabinet capable of maintaining high-temperature uniformity includes a formation chamber 2, an air chamber 22, a power supply chamber 1 and a controller. The air chamber 22 is provided with an intake fan 221, a heating module 222 and an air inlet plate assembly 223. The intake fan 221 is located outside the air chamber 22 and is used to communicate with the external environment through the fan air inlet and introduce external air into the air chamber 22 through the fan air inlet. The heating module 222 is arranged inside the air chamber 22 and is used to heat the air in the air chamber 22. The air inlet plate assembly 223 is located inside the air chamber 22. The air chamber 22 introduces air flow into the formation chamber 2 through the ventilation holes of the air inlet plate assembly 223, and downward air flow is introduced into the formation chamber through the top fan assembly 211 of the press chamber 21 provided in the formation chamber 2. The press chamber 21 is provided with an ambient temperature detector for detecting the ambient temperature of the press chamber 21. A power supply assembly 111 is installed in the power supply chamber 1 and is used to supply power to the battery cells entering the press chamber 21 of the formation chamber 2. The battery cell temperature detector provided in the formation chamber 2 detects the temperature of the battery cells and outputs the battery cell temperature. The controller is used to control the operating parameters of the intake fan 221 and the heating module 222 according to the formation stage of the battery cells, the ambient temperature and the battery cell temperature after the battery cell tray assembly 214 enters the press chamber 21.

[0033] By setting the air chamber 22 to communicate with the formation chamber 2, and installing a power supply component 111 in the power supply chamber 1 to supply power to the battery cells in the press chamber 21 that enters the formation chamber 2. The air chamber 22 controls the temperature of the air flow input into the formation chamber 2 through the air inlet plate assembly 223 by setting an intake fan 221 and a heating module 222. The air flow is introduced downward through the fan assembly arranged at the top of the press chamber 21 to ensure the temperature consistency of each battery cell during the entire formation process. An ambient temperature detector is set in the press chamber 21 to detect the ambient temperature of the press chamber 21, and a battery cell temperature detector is set to detect the temperature of the battery cells, obtain and output the battery cell temperature. The detected temperature feedback is used for real-time temperature equalization control, with timely temperature control and small inertia, achieving rapid attainment of the target ambient temperature range in the formation cabinet during the preheating stage and maintaining temperature uniformity during the heat preservation stage, ensuring the quality of formation and improving the performance of the battery.

[0034] This application does not limit the structure, type, etc. of the ambient temperature detector and the battery cell temperature detector. An infrared temperature detector can be used, or other types of temperature sensors can be used. This application does not limit its structure, quantity, position, etc. It can also be designed as an ambient temperature probe 212 and a battery cell temperature probe 213, that is, the structure of the probe is used for temperature detection, ensuring its convenience of use.

[0035] If an ambient temperature probe is used, the ambient temperature probe only detects whether the ambient temperature reaches the target ambient temperature during the preheating link. Only when the battery cells start the formation process in the subsequent stage will the power module start to generate heat. The wind direction is downward, and the hot air is evenly blown to the battery cell tray through the top fan to provide basic heat preservation. The preheating link provides a high-temperature environment for the start stage of the formation process, and the heat preservation link focuses on the surface temperature of the battery cells.

[0036] By detecting the temperature of the battery cells to obtain and output the battery cell temperature, the controller is used to control the operating parameters of the intake fan 221 and the heating module 222 according to the formation stage of the battery cells, the ambient temperature, and the battery cell temperature after the battery cell tray assembly 214 enters the press chamber 21.

[0037] This application does not limit the heating structure of the heating module 222. A resistance wire can be used, or other structures can be used, such as an electromagnetic heater or an infrared heater.

[0038] In order to further improve the utilization efficiency of space and at the same time improve the utilization efficiency of energy, in one embodiment, the power supply chamber 1 is arranged on the top of the formation chamber 2. The power supply chamber 1 is provided with a power module cavity 11 for installing the power supply component 111. The power supply component 111 is arranged on the bottom plate of the power module cavity 11. The top of the power module cavity 11 is provided with a top sealing plate 15, and the top sealing plate 15 is provided with a plurality of punching louvers for dissipating heat from the power supply component 111.

[0039] The top sealing plate 15 covers the top of the power module cavity 11. The punching louvers on the top sealing plate 15 allow external cold air to enter for heat dissipation operation of the power supply component 111, ensuring the reliability of its operation.

[0040] This application does not limit the shape, position, size, etc. of the punching louvers.

[0041] In order to further improve the utilization efficiency of energy, in one embodiment, the formation cabinet capable of maintaining high-temperature uniformity further includes a built-in fan 112 arranged at one end of the power supply component 111. The built-in fan 112 penetrates through the bottom plate and is used to carry the heat generated by the power supply component 111 to the press cavity 21. The built-in fan 112 is connected to the controller, and the controller is used to control the operating parameters of the built-in fan 112 according to the formation stage of the battery cell.

[0042] By arranging the built-in fan 112, installing the built-in fan 112 at one end of the power supply component 111, penetrating through the bottom plate and with the wind direction downward, and carrying the heat generated by the power supply component 111 to the press cavity 21, the heating power requirement for the heating module 222 can be effectively reduced, and the energy utilization efficiency can be improved.

[0043] In this application, the number, position, model, etc. of the top fan assembly 211 and the built-in fan 112 are not limited. Generally, the two are arranged alternately to ensure the uniformity of heat transfer.

[0044] This application controls the working power of the heating module 222 and related fans in each stage through a controller, and does not limit its structure and specific control process. In one embodiment, the controller is a single-chip microcomputer controller or a PLC controller. The power supply room 1 is provided with a PLC control chamber 13, an electric control chamber 12, and a data acquisition card chamber 14. The electric control chamber 12 is provided with a middle computer and a circuit breaker. The controller is a PLC controller. The PLC control chamber 13 is provided with the PLC controller, a relay, and an adjustable switching power supply. The data acquisition card chamber 14 is equipped with a temperature acquisition module 141 for collecting the ambient temperature of the press chamber through the ambient temperature detector and the surface temperature of the battery cell through the battery cell temperature detector. After receiving a control instruction, the middle computer issues a control signal to the PLC component of the PLC controller, and controls the heating state of the heating module 222 through the PLC component by controlling the adjustable switching power supply, and controls the operating state of the intake fan 221 through the relay.

[0045] By receiving a control instruction through the middle computer and issuing the control instruction through the PLC component, the control method is simple and accurate. This application includes, but is not limited to, the above-mentioned PLC controller and related devices.

[0046] In this application, the external air flow is input through the air inlet plate assembly 223, but there will be a situation where the internal air flow flows out uncontrollably, resulting in heat loss and increased operating costs.

[0047] To solve the above technical problems, in one embodiment, the air inlet plate assembly 223 includes a main body of the air inlet plate assembly 223 and a wind shielding plate 225 provided at the air vent outlet of the main body of the air inlet plate assembly 223. The upper end of the wind shielding plate 225 is hinged to the outside of the top of the air vent. The wind shielding plate 225 is a metal sheet wind shielding plate or a ceramic sheet wind shielding plate. The width of the middle part of the wind shielding plate 225 is greater than the width of the upper part and the lower part, for realizing unidirectional ventilation.

[0048] By providing the wind shielding plate 225 at the air vent outlet, when the air pressure in the air chamber 22 is greater than the air pressure in the formation chamber 2, the air flow will push the wind shielding plate 225 to rotate, opening the air vent and allowing the external air flow to enter the formation chamber 2. On the contrary, the air flow will press the wind shielding plate 225 against the air vent, blocking the air vent, so that the air flow in the formation chamber 2 cannot flow out, avoiding heat loss and improving the energy utilization efficiency.

[0049] Since the wind shielding plates 225 such as the metal sheet wind shielding plate in this application only perform unidirectional ventilation, their weight cannot be too large, otherwise a large air flow is required to push. Therefore, metal thin sheets are generally used as the wind shielding plates.

[0050] The above wind shield can also adopt magnetic adsorption or the like to ensure that the fluctuations of the gentle breeze will not push it away.

[0051] In this application, the number, position, size, etc. of the ventilation holes are not limited, and the material and installation method of the wind shield 225 are not limited.

[0052] In one embodiment, a plurality of the ventilation holes are arrayed and distributed on the main body of the wind plate 21 assembly. The plurality of ventilation holes have the same shape and equal size, and the ventilation holes are rectangular ventilation holes or circular ventilation holes.

[0053] In order to further implement the formation operation for different products and realize the automation of the formation operation, in one embodiment, the formation cabinet capable of maintaining high-temperature uniformity further includes a parameter setting module disposed outside the power supply chamber 1 for setting the temperature threshold range of the press chamber 21 in the preheating stage and the heat preservation stage, and the operation parameters of the corresponding heating module 222, the air inlet fan, and the built-in fan 112.

[0054] By setting the parameter setting module, different operation parameters can be set according to different needs to realize the formation of different products. In this application, the setting method of the parameter setting module is not limited, which can be custom setting, or selecting a pre-stored battery type, or other parameter setting methods, etc.

[0055] In this application, other devices and components of the press chamber 21 are not limited. In one embodiment, in order to improve the fixing effect on the battery cells and the safety and reliability of the formation process, in one embodiment, the formation cabinet capable of maintaining high-temperature uniformity further includes a battery cell tray assembly 214, a probe assembly, a lifting mechanism assembly, a negative pressure suction nozzle, a smoke sensor, and a fire fighting pipe disposed in the press chamber 21. The battery cell tray assembly 214 is used to carry the battery cells to be subjected to formation treatment. The negative pressure suction nozzle is disposed on the battery cell tray assembly 214 and is used to perform an adsorption operation on the battery cells to be subjected to formation treatment. The smoke sensor is used to detect smoke in the press chamber 21. The fire fighting pipe is used to perform fire fighting treatment after a fire occurs in the press chamber 21. The probe assembly is used to connect the electrodes of the battery cells and is powered by the power supply assembly 111.

[0056] The fixing and position control of the battery cells are realized through the battery cell tray assembly 214, the lifting mechanism assembly, and the negative pressure suction nozzle. Through devices such as the smoke sensor and the fire fighting pipe, in case of an accident, the protection of the device can be quickly realized, and the operation safety of the entire device can be improved.

[0057] In order to further ensure the temperature consistency at various locations and reduce heat exchange with the outside, in one embodiment, the formation cabinet capable of maintaining high-temperature uniformity further includes a sheet metal cavity provided on the wall surface of the press cavity 21 and a heat-insulating cotton layer filled in the sheet metal cavity, which is used to thermally isolate the press cavity 21 from the external environment.

[0058] By providing a sheet metal cavity on the wall surface of the press cavity 21 and filling the sheet metal cavity with a heat-insulating cotton layer, the press cavity 21 is thermally isolated from the external environment, heat exchange with the outside is reduced, and the balance of temperature distribution is improved.

[0059] This application includes but is not limited to using a heat-insulating cotton layer for heat insulation. Other heat-insulating layer structures can also be used, and the thickness of the heat-insulating cotton layer is not limited in this application.

[0060] Furthermore, in order to avoid the situation where it is difficult to inject air into the air cavity due to excessive air pressure inside the press cavity 21, in one embodiment, the formation cabinet capable of maintaining high-temperature uniformity further includes at least one through hole provided at the bottom of the press cavity 21 and a polyurethane sponge layer covering the through hole, which is used to prevent overpressure in the press cavity 21.

[0061] By providing at least one through hole at the bottom of the press cavity 21 and covering the through hole with a polyurethane sponge layer, overpressure in the press cavity 21 is prevented. If the pressure inside the press cavity 21 is too high, the pressure can be released through the through hole. On the one hand, the polyurethane sponge layer can reduce heat loss, and on the other hand, it can also prevent direct discharge, and the internal pressure can be controlled by the thickness of the polyurethane sponge layer.

[0062] This application includes but is not limited to using a polyurethane sponge layer for pressure control.

[0063] In one embodiment, the formation cabinet capable of maintaining high-temperature uniformity includes a power supply room 1 and a formation room 2; the power supply room 1 includes a power module cavity 11, an electric control cavity 12, a PLC control cavity 13, and a data acquisition card cavity 14; a power supply component 111 is installed on the bottom plate of the power module cavity 11; a top cover plate 15 covers the top of the power module cavity 11, and the top cover plate 15 is punched with louver holes for external cold air to enter and dissipate heat from the power supply component 111; a built-in fan 112 is installed at one end of the power supply component 111, penetrates the bottom plate and the wind direction is downward, and takes the heat generated by the power supply component 111 to the press cavity 21; electric control components such as a middle position machine and a circuit breaker are arranged in the electric control cavity 12; electric components such as a PLC component, a relay, and an adjustable switching power supply are arranged in the PLC control cavity 13; a temperature acquisition module 141 is installed in the data acquisition card cavity 14 to collect the surface temperature of the battery cells.

[0064] The formation chamber 2 includes a press chamber 21 and a wind chamber 22; the top fan assembly 211 is installed above the inside of the press chamber 21 with the wind direction facing downwards, which is conducive to the uniform heating of the formation chamber; the ambient temperature probes 212 are respectively arranged at the four corners inside the press chamber 21 to collect the ambient temperature at each position; the cell temperature probes 213 are arranged directly above the cell tray assembly 214 to collect the temperature on the surface of each cell, and transmit the temperature data to the temperature acquisition module 141;

[0065] The wind chamber 22 includes an intake fan 221, a heating module 222, and an air inlet plate assembly 223; the intake fan 221 is located outside the wind chamber, and its air inlet is connected to the environment to introduce external air; the heating module 222 is arranged inside the wind chamber 22 to heat the air introduced by the intake fan 221; the air inlet plate assembly 223 is located inside the wind chamber and is composed of an air plate 224 and several wind shielding plates 225 to ensure unidirectional air intake and prevent backflow.

[0066] The specific control process is as follows:

[0067] Step 1, preheating stage: After the cell tray assembly 214 enters the press chamber 21, the environment inside the press chamber 21 starts to be rapidly heated;

[0068] The middle unit in the electric control chamber 12 sends a signal to the PLC component in the PLC control chamber 13. The PLC component controls the adjustable switching power supply to make the heating module 222 start heating, and then the PLC component controls the relay to make the intake fan 221 start running; the intake fan 221 introduces external air, and the air is heated by the heating module 222 and then flushes open the wind shielding plates 225 on the air inlet plate assembly 223 to raise the temperature of the environment inside the press chamber 21; the ambient temperature probes 212 transmit the ambient temperature data at each position inside the press chamber 21 to the temperature acquisition module 141, which is then fed back to the middle unit in real time, and the middle unit determines whether the current ambient temperature T1 reaches the target ambient temperature T0;

[0069] When T1 < T0, the above heating stage continues; when T1 > T0, the middle unit sends a signal to the PLC component, and the corresponding intake fan 221 is stopped by controlling the relay. The wind shielding plate 225 corresponding to the fan re-covers the air inlet, and then the heating module 222 is stopped by controlling the adjustable switching power supply;

[0070] Through the above preheating stage, the ambient temperature inside the press chamber 21 is maintained within the target ambient temperature range, and the temperature uniformity is ensured.

[0071] Step 2, heat preservation stage: While the cells are undergoing the formation process, heat is continuously generated. This is the stage of coordinating control to maintain the cell temperature within the target temperature range;

[0072] The power supply component 111 powers on the battery cells in the battery cell tray component 214. The built-in fan 112 takes the heat generated by the power supply component 111 to the press cavity 21, and the top fan component 211 blows hot air evenly onto the battery cell tray component 214;

[0073] The battery cell temperature probe 213 transmits the surface temperature data of the battery cell to the temperature acquisition module 141, which feeds it back to the middle computer in real time. The middle computer performs corresponding coordinated control on the heating module 222 and the intake fan 221 based on the surface temperature distribution of the battery cell;

[0074] The real-time surface temperature of a certain battery cell is TC, and the target temperature range is (TCmin, TCmax);

[0075] When TC < TCmin, the middle computer sends a signal to the PLC component. The PLC component controls the adjustable switching power supply to make the heating module 222 start heating, and then the PLC component controls the relay to make the intake fan 221 start running; the intake fan 221 introduces external air, and the air is heated by the heating module 222 and then flushes open the wind shielding plate 225 on the air inlet plate component 223 to raise the temperature of the environment near the battery cell;

[0076] When TC ∈ (TCmin, TCmax), the middle computer sends a signal to the PLC component, and the intake fan 221 at the corresponding position is stopped by controlling the relay. The wind shielding plate 225 corresponding to the fan covers the air inlet again, and then the heating module 222 is stopped by controlling the adjustable switching power supply;

[0077] When TC > TCmax, the middle computer sends a signal to the PLC component. The PLC component controls the adjustable switching power supply to make the heating module 222 stop heating, and then the PLC component controls the relay to make the intake fan 221 start running; the intake fan 221 introduces external air, and the air flushes open the wind shielding plate 225 on the air inlet plate component 223 to lower the temperature of the environment near the battery cell;

[0078] Through the above heat preservation link, the surface temperature of the battery cells in the battery cell tray component 214 is maintained within the target temperature range, and the temperature uniformity is ensured.

[0079] In addition to the above control methods, temperature regulation can also be carried out point-to-point according to the temperature performance of each battery cell. For example, in special cases, when TC < TCmin - 5°C, the heating module is adjusted to the high-power mode and the intake fan is adjusted to the low-speed mode; when TC > TCmax + 5°C, the heating module remains in the stopped state and the intake fan is adjusted to the high-speed mode, etc.

[0080] In addition to the above control methods, coordinated control can also be carried out through the following methods:

[0081] When the surface temperature of a certain battery cell is lower than the target temperature range, control the heating module corresponding to the battery cell area to start heating, and then control the intake fan corresponding to the battery cell area to start running. The intake fan introduces external air, and the air is heated after passing through the heating module and then flushes open the corresponding wind shielding plate on the air inlet plate assembly, raising the surface temperature of the battery cell;

[0082] When the surface temperature of a certain battery cell is higher than the target temperature range, control the intake fan corresponding to the battery cell area to start running. The intake fan introduces external air, and the air flushes open the corresponding wind shielding plate on the air inlet plate assembly, lowering the surface temperature of the battery cell;

[0083] When the surface temperature of the battery cell is within the target temperature range, the heating module and the intake fan corresponding to the battery cell area do not work.

[0084] The above technical solution can reasonably utilize the heat generated by the power module, can perform point-to-point temperature control in real time according to the temperature feedback inside the storage location, has timely temperature control and small inertia, can ensure that the battery cells are within the target temperature range during the formation process, and ensure uniformity.

[0085] In summary, the formation cabinet capable of maintaining high-temperature uniformity provided by the embodiment of the present invention is connected to the formation chamber by setting a wind cavity, installs a power supply component in the power supply chamber to supply power to the battery cells in the press cavity entering the formation chamber, controls the temperature of the air flow input into the formation chamber through the air inlet plate assembly by setting an intake fan and a heating module in the wind cavity, and passes the air flow downward through the fan assembly arranged at the top of the press cavity to ensure the temperature consistency of each battery cell during the entire formation process. An ambient temperature detector is set in the press cavity to detect the ambient temperature of the press cavity, and a battery cell temperature detector is set to detect and output the battery cell temperature of the battery cell. The detected temperature feedback is used to perform temperature equalization control in real time. The temperature control is timely and has small inertia, and it can quickly reach the target ambient temperature range in the preheating stage and maintain temperature uniformity in the heat preservation stage, ensuring the quality of formation and improving the performance of the battery.

[0086] The above has introduced in detail the formation cabinet capable of maintaining high-temperature uniformity provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A formation cabinet capable of maintaining high-temperature uniformity, characterized in that It includes a formation chamber, a wind cavity, a power supply chamber and a controller. The wind cavity is provided with an intake fan, a heating module and an air inlet plate assembly. The intake fan is located outside the wind cavity and is used to communicate with the external environment through a fan air inlet and introduce external air into the wind cavity through the fan air inlet. The heating module is arranged inside the wind cavity and is used to heat the air in the wind cavity. The air inlet plate assembly is located inside the wind cavity. The wind cavity introduces air flow into the formation chamber through the ventilation holes of the air inlet plate assembly and conducts air flow into the formation chamber downward through a top fan assembly arranged at the press cavity of the formation chamber. The press cavity is provided with an ambient temperature detector for detecting the ambient temperature of the press cavity. A power supply component is installed in the power supply chamber and is used to supply power to the battery cells entering the press cavity of the formation chamber. A battery cell temperature detector arranged in the formation chamber detects the temperature of the battery cells and obtains and outputs the battery cell temperature. The controller is used to control the operating parameters of the intake fan and the heating module according to the formation stage of the battery cells, the ambient temperature and the battery cell temperature after the battery cell tray assembly enters the press cavity.

2. The formation cabinet capable of maintaining high-temperature uniformity according to claim 1, wherein The power supply chamber is arranged on the top of the formation chamber. The power supply chamber is provided with a power module cavity for installing the power supply component. The power supply component is arranged on the bottom plate of the power module cavity. A top sealing plate is arranged on the top of the power module cavity. The top sealing plate is provided with a plurality of punching louvers for dissipating heat of the power supply component.

3. The formation cabinet capable of maintaining high-temperature uniformity according to claim 2, wherein It further includes a built-in fan arranged at one end of the power supply component. The built-in fan penetrates through the bottom plate and is used to bring the heat generated by the power supply component to the press cavity. The built-in fan is connected to the controller. The controller is used to control the operating parameters of the built-in fan according to the formation stage of the battery cells.

4. The formation cabinet capable of maintaining high-temperature uniformity according to claim 3, wherein, The controller is a single-chip microcomputer controller or a PLC controller. The power supply chamber is provided with a PLC control cavity, an electric control cavity and a data acquisition card cavity. The electric control cavity is provided with a middle computer and a circuit breaker. The controller is a PLC controller. The PLC control cavity is provided with the PLC controller, a relay and an adjustable switching power supply. The data acquisition card cavity is installed with a temperature acquisition module for collecting the ambient temperature of the press cavity through the ambient temperature detector and the surface temperature of the battery cells through the battery cell temperature detector. The middle computer is used to send a control signal to the PLC component of the PLC controller after receiving a control instruction, control the heating state of the heating module through the PLC component by controlling the adjustable switching power supply, and control the operating state of the intake fan through the relay.

5. The formation cabinet capable of maintaining high-temperature uniformity according to claim 1, wherein The air inlet plate assembly includes a wind plate and a wind shielding plate arranged at the outlet of the ventilation hole of the wind plate. The upper end of the wind shielding plate is hinged to the outer side of the top of the ventilation hole. The wind shielding plate is a metal sheet wind shielding plate or a ceramic sheet wind shielding plate. The width of the middle part of the wind shielding plate is greater than that of the upper part and the lower part, so as to realize one-way ventilation.

6. The formation cabinet capable of maintaining high-temperature uniformity according to claim 5, wherein A plurality of the ventilation holes are arranged in an array on the main body of the air plate assembly. The plurality of ventilation holes have the same shape and equal size, and the ventilation holes are rectangular ventilation holes or circular ventilation holes.

7. The formation cabinet capable of maintaining high-temperature uniformity according to claim 1, characterized in that, It further includes a parameter setting module arranged outside the power supply chamber, which is used to set the temperature threshold range of the press cavity in the preheating stage and the heat preservation stage, as well as the operating parameters of the corresponding heating module, the intake fan, and the built-in fan.

8. The formation cabinet capable of maintaining high-temperature uniformity according to any one of claims 1-7, characterized in that, It further includes a battery cell tray assembly, a probe assembly, a lifting mechanism assembly, a negative pressure suction nozzle, a smoke sensor, and a fire hose arranged in the press cavity. The battery cell tray assembly is used to carry the battery cells undergoing formation treatment. The negative pressure suction nozzle is arranged on the battery cell tray assembly and is used to perform an adsorption operation on the battery cells undergoing formation treatment. The smoke sensor is used to detect smoke in the press cavity. The fire hose is used to perform fire fighting treatment after a fire occurs in the press cavity. The probe assembly is used to connect the electrodes of the battery cells and is powered by the power supply assembly.

9. The formation cabinet capable of maintaining high-temperature uniformity according to claim 8, wherein It further includes a sheet metal cavity arranged on the wall surface of the press cavity and a heat insulation cotton layer filled in the sheet metal cavity, which is used to thermally isolate the press cavity from the external environment.

10. The formation cabinet capable of maintaining high-temperature uniformity according to claim 9, wherein It further includes at least one through hole arranged at the bottom of the press cavity and a polyurethane sponge layer covering the through hole, which is used to prevent overpressure in the press cavity.

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