Baking device for square aluminum shell battery cell and baking method thereof

Abstract

The invention relates to a baking device for a square aluminum shell battery cell and a baking method thereof.The baking device comprises a box body internally provided with a containing cavity, a plurality of heat conduction supporting plates arranged in the containing cavity and used for baking the battery cell, an air inflation module arranged on the box body and used for inflating the containing cavity, and an air exhaust assembly for exhausting air in the containing cavity; the heat conduction supporting plates are horizontally laid in the containing cavity of the box body and evenly distributed in the height direction of the box body, a water inlet pipe and a water outlet pipe which are communicated with the heat conduction supporting plates are arranged in the containing cavity, and the water inlet pipe and the water outlet pipe convey hot water generated by the heater to the heat conduction supporting plates. Through the design of the horizontally laid heat-conducting support plate and the internal flow channel, the heat medium fully circulates in the flow channel, and then the first contact surface at the bottom of the tray is tightly attached to the second contact surface of the heat-conducting support plate, so that the contact area with the battery cell is increased, the effective transfer of heat is ensured, and the heat conduction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery manufacturing, and in particular to a baking device and a baking method for square aluminum shell battery cells. Background Art

[0002] In lithium battery manufacturing, the baking treatment of square aluminum shell lithium iron phosphate cells is a key step to ensure battery performance and life.

[0003] Traditional baking methods such as thermal radiation heating and hot air heating have many shortcomings. These methods often lead to uneven heating, resulting in large temperature differences inside the battery cells, affecting the consistency and reliability of the battery. At the same time, traditional methods usually require a long baking cycle, which not only increases production time but also increases energy consumption. In addition, for battery cells of different sizes or specifications, adjusting the heating device to adapt to the new requirements is time-consuming and complicated, reducing production flexibility. In particular, although the use of vertically placed heating plates can increase the contact area with the battery cells to a certain extent, its application range is limited to battery cells of specific specifications. When faced with the demand for battery cells of multiple specifications, the adjustment process is time-consuming and complicated. Summary of the Invention

[0004] The present invention aims to solve the problems existing in the above-mentioned prior art and provides a baking device and a baking method for square aluminum shell battery cells, which realize efficient and uniform baking of the battery cells through a horizontally laid heat-conducting support plate, a water circulation heating system and an intelligent temperature control system.

[0005] The present invention solves its technical problems by adopting a technical solution: This baking device for square aluminum shell battery cells comprises a box body with a cavity formed therein, a plurality of heat-conducting support plates arranged in the cavity for baking the battery cells, an inflation module arranged on the box body for inflating the cavity, and an exhaust assembly for extracting the gas in the cavity. The plurality of heat-conducting support plates are horizontally laid out in the cavity of the box body and are evenly distributed along the height direction of the box body. A water inlet pipe and a water outlet pipe connected to the heat-conducting support plate are provided in the cavity. The water inlet pipe is connected to the water inlet of an external heater, and the water outlet pipe is connected to the water return port of the heater. The water inlet pipe transports the heat medium generated by the heater to the heat-conducting support plate, and the heat-conducting support plate bakes the battery cells through heat conduction, and the heat medium flows back to the heater through the water outlet pipe to form a circulation.

[0006] Preferably, the heat-conducting support plate is provided with a heat-conducting part, and a water inlet and a water outlet are respectively provided at the left and right ends of the heat-conducting part. The water inlet is connected to the water inlet pipe, and the water outlet is connected to the water outlet pipe. A flow channel passing through the water inlet and the water outlet is provided inside the heat-conducting part for the circulation of heat medium.

[0007] Preferably, a tray for placing the battery cells to be baked is slidably provided on the heat-conducting support plate, a first contact surface is provided on the top of the heat-conducting portion, a second contact surface is provided at the bottom of the tray that is in contact with the first contact surface, and a limiting groove matching the shape of the outer wall of the battery cell is provided at the top of the tray, and the bottom of the limiting groove abuts against the outer surface of the battery cell.

[0008] Preferably, the heat-conducting support plate is provided with a limiting portion located above the heat-conducting portion. The limiting portion is a U-shaped structure, extending from both sides and the rear of the heat-conducting portion and surrounding upward. An opening is formed on the front side of the limiting portion. The tray is horizontally pushed into the limiting portion through the opening and fits against the upper surface of the heat-conducting portion.

[0009] Preferably, the flow channel includes a first channel extending along the length direction of the heat-conducting support plate and connected to the water inlet, a second channel arranged parallel to the first channel and connected to the water outlet, and several groups of curved portions arranged between the first channel and the second channel, each group of curved portions includes a first curved channel and a second curved channel extending along the width direction of the heat-conducting support plate and a vertical channel arranged perpendicular to the width direction, and both ends of the vertical channel are respectively connected to the first curved channel and the second curved channel; wherein, the first curved channel close to the curved portion of the first channel is connected to the first channel, and the second curved channel close to the curved portion of the second channel is connected to the second channel.

[0010] Preferably, the first channel extending along the length direction of the heat-conducting support plate and connected to the water inlet, the second channel arranged parallel to the first channel and connected to the water outlet, and the square chamber located between the first channel and the second channel, the square chamber is arranged below the limiting portion of the heat-conducting part and is connected to the first channel and the second channel, and the heat medium flows from the first channel into the square chamber and then into the second channel.

[0011] Preferably, the box body is provided with a first temperature sensor and a second temperature sensor, the first temperature sensor is installed on the water inlet pipe, and is used to detect the water temperature of the heat medium entering the heat-conducting support plate, and the second temperature sensor is installed on the water outlet pipe, and is used to detect the water temperature of the heat medium after heat conduction through the heat-conducting support plate. The first temperature sensor and the second temperature sensor are communicatively connected to the external controller to adjust the heat medium circulation parameters according to the water temperature difference.

[0012] Preferably, the inflation module is configured as an air inlet pipe, which is installed at the rear end of the box body and is connected to an external inflation device for filling nitrogen gas into the cavity; The front outer wall of the box body is connected to an openable and closable door panel via a hinge, and the inner edge of the door panel is provided with a sealing strip for sealing the cavity when closed.

[0013] Preferably, the air extraction component includes an air extraction pump and an air outlet port, the air outlet port is arranged at the top of the box body and communicates with the cavity, the air extraction pump is arranged at the rear end of the box body, and the air outlet pipe port is connected to the air extraction pump through a pipeline.

[0014] A baking method for a baking device for a square aluminum shell battery cell, comprising the following steps: S1. Place the square aluminum shell battery cell to be baked in the limiting groove of the tray of the heat-conducting support plate, close the door panel of the box, seal the cavity with the sealing strip, start the heater, and supply heat medium to the heat-conducting support plate through the water inlet pipe. Preheat for 5 minutes to raise the internal temperature of the battery cell to above 55°C; S2. Maintaining the baking temperature at no more than 100°C, perform the first stage baking for 400 minutes, and perform a nitrogen replacement cycle every 20 minutes. In this process, nitrogen is filled into the cavity through the inflation module to a vacuum degree of 10,000 Pa, and the vacuum pump of the exhaust component is simultaneously started to reduce the vacuum degree in the cavity to 50-200 Pa. S3, perform the second stage baking for 300 minutes, and perform a nitrogen replacement cycle every 15 minutes, wherein nitrogen is filled into the cavity through the inflation module to a vacuum degree of 5000Pa, and the vacuum pump of the exhaust component is simultaneously started to reduce the vacuum degree in the cavity to 50-200Pa; S4, performing the third stage baking for 200 minutes, and performing a nitrogen replacement cycle every 10 minutes, wherein nitrogen is filled into the cavity through the inflation module to a vacuum degree of 3000Pa, and the vacuum pump of the exhaust component is simultaneously started to evacuate the vacuum degree in the cavity to 50-200Pa; S5. Stop the heater and start the water circulation cooling system to cool the heat medium to below 50°C through the water outlet pipe. The cooling time is 50 minutes. After the surface temperature in the cavity drops below 50°C, open the door panel and take out the baked battery cells.

[0015] The beneficial effects of the present invention are: the water inlet pipe and the water outlet pipe transport the hot water generated by the heater to the heat-conducting support plate. Through the horizontally laid heat-conducting support plate and the internal flow channel design, the heat medium circulates fully in the flow channel, and then the first contact surface at the bottom of the tray is tightly fitted with the second contact surface of the heat-conducting support plate, thereby increasing the contact area with the battery cell, ensuring the effective transfer of heat and improving the heat conduction efficiency, shortening the baking time, and increasing the number of batteries that can be put into the oven at a single time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a baking device for square aluminum shell battery cells according to the present invention; Figure 2 This is a rear view of a baking device for square aluminum shell battery cells according to the present invention; Figure 3It is a structural diagram of the heat-conducting support plate and the tray; Figure 4 Schematic diagram of the structure of the tray and battery cell; Figure 5 for Figure 1 The structural cross-sectional view at A-A-; Figure 6 Schematic diagram of the heat conducting portion in the second embodiment; Figure 7 The invention provides a flow chart of a baking method for square aluminum shell battery cells.

[0017] Description of reference numerals: 1. Box body; 100. Water inlet pipe; 101. Water outlet pipe; 102. First temperature sensor; 103. Second temperature sensor; 104. Door panel; 105. Sealing strip; 106. Cavity; 2. Heat-conducting support plate; 200. Heat-conducting portion; 201. Water inlet; 202. Water outlet; 203. Tray; 204. First contact surface; 205. Second contact surface; 206. Position-limiting groove; 207. Position-limiting portion; 208. Opening; 209. First channel; 210. Second channel; 211. Bend; 212. First curved channel; 213. Second curved channel; 214. Vertical channel; 215. Square chamber; 3. Inflatable module; 4. Air extraction component; 400. Air extraction pump; 401. Air outlet port. DETAILED DESCRIPTION

[0018] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0019] like Figures 1 to 5 As shown, a baking device for square aluminum shell battery cells includes a box body 1 with a cavity 106 formed therein, a plurality of heat-conducting support plates 2 arranged in the cavity 106 for baking the battery cells, an inflation module 3 arranged on the box body 1 to inflate the cavity 106, and an exhaust component 4 to extract the gas in the cavity 106. The plurality of heat-conducting support plates 2 are horizontally laid out in the cavity 106 of the box body 1 and are evenly distributed along the height direction of the box body 1. A water inlet pipe 100 and a water outlet pipe 101 connected to the heat-conducting support plate 2 are provided in the cavity 106. The water inlet pipe 100 is connected to the water inlet 201 of the external heater, and the water outlet pipe 101 is connected to the return water port of the heater. The water inlet pipe 100 transports the heat medium generated by the heater to the heat-conducting support plate 2. The heat-conducting support plate 2 bakes the battery cells through heat conduction, and the heat medium flows back to the heater through the water outlet pipe 101 to form a circulation.

[0020] A plurality of heat-conducting support plates 2 are arranged in the box body 1 with a cavity 106 formed therein. The heat-conducting support plates 2 are evenly distributed along the height direction of the box body 1. The heat-conducting support plates 2 are made of heat-conducting metal material. These heat-conducting support plates 2 are connected to the external heater through the water inlet pipe 100 and the water outlet pipe 101 connected thereto, forming a closed heat medium circulation system. In this embodiment, the heat medium is water. The heat medium generated by the external heater is transported to each heat-conducting support plate 2 through the water inlet pipe 100, thereby achieving uniform heating and baking of the battery cells placed thereon, and then the heat after cooling is heated. The medium then flows back to the heater through the outlet pipe 101 for reheating, ensuring the effective transfer and utilization of heat. This not only achieves efficient and uniform baking of the battery cells, improves the consistency and reliability of the battery, but also shortens the baking cycle and reduces energy consumption. In addition, the device is also equipped with an inflation module 3 and an exhaust component 4. The inflation module 3 is used to fill the cavity 106 with protective gas (nitrogen) to prevent oxidation of the battery cells. The exhaust component 4 is used to extract waste gases such as water vapor and nitrogen after baking, thereby keeping the internal environment clean and stable, and further ensuring the quality and performance of the battery cells.

[0021] Specifically, if Figures 1 to 5 As shown, the heat-conducting support plate 2 is provided with a heat-conducting portion 200, and a water inlet 201 and a water outlet 202 are respectively provided at the left and right ends of the heat-conducting portion 200. The water inlet 201 is connected to the water inlet pipe 100, and the water outlet 202 is connected to the water outlet pipe 101. A flow channel is provided inside the heat-conducting portion 200, which passes through the water inlet 201 and the water outlet 202, for the circulation of the heat medium.

[0022] A heat conducting part 200 is provided inside the heat conducting support plate 2, and a water inlet 201 and a water outlet 202 are respectively provided at the left and right ends of the heat conducting part 200. The water inlet 201 is connected to the external water inlet pipe 100, and the water outlet 202 is connected to the water outlet pipe 101, forming a complete heat medium circulation path. A flow channel running through the water inlet 201 and the water outlet 202 is carefully designed inside the heat conducting part 200. This flow channel is responsible for guiding the flow of the heat medium in the heat conducting support plate 2, thereby realizing effective heat transfer. The heat medium can be evenly distributed in the heat conducting support plate 2 and perform efficient heat exchange, ensuring that the battery core can receive a stable and uniform heat supply during the baking process.

[0023] Furthermore, if Figure 3 and Figure 4 As shown, a tray 203 for placing the battery cells to be baked is slidably provided on the heat-conducting support plate 2, a first contact surface 204 is provided on the top of the heat-conducting portion 200, and a second contact surface 205 is provided at the bottom of the tray 203 that is in contact with the first contact surface 204. A limiting groove 206 matching the shape of the outer wall of the battery cell is provided on the top of the tray 203, and the bottom of the limiting groove 206 abuts against the outer surface of the battery cell.

[0024] In order to facilitate the placement and fixation of the battery cells, a tray 203 specifically for carrying the battery cells to be baked is slidably set on the heat-conducting support plate 2. The tray 203 is made of stainless steel, and a precisely machined first contact surface 204 is provided at the top of the heat-conducting part 200, and a second contact surface 205 is provided at the corresponding position at the bottom of the tray 203. The two fit tightly to ensure the best heat conduction effect. In addition, the top of the tray 203 is specially designed with limiting grooves 206 that match the shape of the outer wall of the battery cell. These grooves can not only firmly place the battery cells to prevent them from moving or tilting during baking, but also the bottom of the limiting grooves 206 are in direct contact with the outer surface of the battery cell, further enhancing the efficiency of heat transfer from the heat-conducting support plate 2 to the battery cell.

[0025] It should be noted that trays 203 of different sizes can be placed on each layer of the heat-conducting support plate 2 according to battery cells of different sizes. In this embodiment, two trays 203 can be placed on each layer of the heat-conducting support plate 2 .

[0026] Furthermore, if Figure 3 and Figure 4 As shown, the heat-conducting support plate 2 is provided with a limiting portion 207 located above the heat-conducting portion 200. The limiting portion 207 is a U-shaped structure, extending from both sides and the rear of the heat-conducting portion 200 and surrounding upward. An opening 208 is formed on the front side of the limiting portion 207. The tray 203 is horizontally pushed into the limiting portion 207 through the opening 208 and fits against the upper surface of the heat-conducting portion 200.

[0027] A limiting portion 207 is provided above the heat-conducting support plate 2. The limiting portion 207 adopts a U-shaped structure design, horizontally surrounding the two sides and the rear of the heat-conducting portion 200 from the front opening 208, and extending upward, which allows the tray 203 to be easily pushed into the interior of the limiting portion 207 through the front opening 208, and ensures that the tray 203 fits perfectly with the upper surface of the heat-conducting portion 200, thereby providing additional support and stability. The presence of the limiting portion 207 not only simplifies the installation process of the tray 203 and reduces the adjustment time, but also effectively avoids the risk of displacement of the tray 203 due to accidental collision, thereby greatly improving the safety and reliability of operation.

[0028] like Figure 1 and Figure 5As shown, the flow channel includes a first channel 209 extending along the length direction of the heat-conducting support plate 2 and connected to the water inlet 201, a second channel 210 arranged parallel to the first channel 209 and connected to the water outlet 202, and several groups of curved portions 211 arranged between the first channel 209 and the second channel 210. Each group of curved portions 211 includes a first curved channel 212 and a second curved channel 213 extending along the width direction of the heat-conducting support plate 2 and a vertical channel 214 arranged perpendicular to the width direction. The two ends of the vertical channel 214 are respectively connected to the first curved channel 212 and the second curved channel 213; wherein, the first curved channel 212 close to the curved portion 211 of the first channel 209 is connected to the first channel 209, and the second curved channel 213 close to the curved portion 211 of the second channel 210 is connected to the second channel 210.

[0029] Inside the heat-conducting support plate 2, the flow channel is designed with a complex multi-stage structure to optimize the flow path of the heat medium and the heat conduction efficiency. The flow channel is composed of a first channel 209 and a second channel 210 extending along the length direction of the heat-conducting support plate 2. The first channel 209 is connected to the water inlet 201 and is responsible for introducing the heat medium, while the second channel 210 is connected to the water outlet 202 and is used to discharge the cooled medium. Between these two main channels, there are several groups of bends 211, each group of bends 211 includes a first bend channel 212 extending along the width direction and a second bend channel 210 extending along the width direction. A second curved channel 213 and a vertical channel 214 arranged perpendicular to the width direction, these vertical channels 214 connect the first and second curved channels 213, the first curved channel 212 close to the curved portion 211 of the first channel 209 is directly connected to the first channel 209, and the second curved channel 213 close to the curved portion 211 of the second channel 210 is directly connected to the second channel 210. This design not only increases the residence time and contact area of the heat medium in the heat-conducting support plate 2, but also ensures that the heat can be evenly distributed on the entire support plate.

[0030] Specifically, if Figure 1 As shown, a first temperature sensor 102 and a second temperature sensor 103 are provided on the box body 1. The first temperature sensor 102 is installed on the water inlet pipe 100 to detect the water temperature of the heat medium entering the heat-conducting support plate 2. The second temperature sensor 103 is installed on the water outlet pipe 101 to detect the water temperature of the heat medium after heat conduction through the heat-conducting support plate 2. The first temperature sensor 102 and the second temperature sensor 103 are communicated with the external controller to adjust the heat medium circulation parameters according to the water temperature difference.

[0031] A first temperature sensor 102 and a second temperature sensor 103 are provided on the housing 1 to accurately monitor the water temperature of the heat medium. The first temperature sensor 102 is installed at the water inlet pipe 100 to detect the initial temperature of the heat medium entering the heat-conducting support plate 2; and the second temperature sensor 103 is installed at the water outlet pipe 101 to monitor the temperature of the heat medium after heat conduction through the heat-conducting support plate 2. These two sensors are connected to an external controller. Through real-time transmitted data, the controller can automatically adjust the circulation parameters of the heat medium according to the water temperature difference between the water inlet pipe 100 and the water outlet pipe 101.

[0032] Specifically, if Figure 2 As shown, the inflation module 3 is configured as an air intake pipe, which is installed at the rear end of the box body 1 . The air intake pipe is connected to an external inflation device for filling nitrogen gas into the cavity 106 .

[0033] The air inlet pipe is installed at the rear end of the box body 1, with one end connected to the cavity 106 in the box body 1 and the other end connected to the external inflation equipment. It is mainly used to fill the cavity 106 with nitrogen gas, which can provide an inert gas protection environment for the battery cell during the baking process to prevent it from being damaged by oxidation. It can also help maintain the pressure balance in the cavity 106 to prevent pollution caused by the entry of outside air.

[0034] Furthermore, if Figure 1 and Figure 2 As shown, the air extraction component 4 includes an air extraction pump 400 and an air outlet port 401. The air outlet port 401 is arranged at the top of the box body 1 and communicates with the cavity 106. The air extraction pump 400 is arranged at the rear end of the box body 1, and the air outlet pipe is connected to the air extraction pump 400 through a pipeline.

[0035] The air outlet port 401 is arranged at the top of the box body 1 and is connected to the cavity 106, while the vacuum pump 400 is located at the rear end of the box body 1. The two are connected by a pipeline. The vacuum pump 400 can effectively discharge the exhaust gas in the cavity 106 to maintain the internal environment. By timely removing the exhaust gas such as water vapor generated during the baking process, the battery cell is ensured to be dried quickly.

[0036] Specifically, if Figure 1 As shown, the front outer wall of the box body 1 is connected to an openable and closable door panel 104 via a hinge, and a sealing strip 105 is provided on the inner edge of the door panel 104 for sealing the cavity 106 when closed.

[0037] The front outer wall of the box body 1 is connected to an openable and closable door panel 104 by a hinge, and a sealing strip 105 is provided on the inner edge of the door panel 104. When the door panel 104 is closed, the sealing strip 105 can fit tightly against the edge of the box body 1 to form an effective sealing effect, which makes it easier for staff to load and unload battery cells and improves work efficiency.

[0038] Example 2 like Figure 6 As shown, a baking device for square aluminum shell battery cells of this embodiment includes: a box body 1, a heat conductive support plate 2, an inflation module 3 and an exhaust component 4.

[0039] Specifically, a first channel 209 extending along the length direction of the heat-conducting support plate 2 and connected to the water inlet 201, a second channel 210 arranged parallel to the first channel 209 and connected to the water outlet 202, and a square chamber 215 located between the first channel 209 and the second channel 210. The square chamber 215 is arranged below the limiting portion 207 of the heat-conducting portion 200 and is connected to the first channel 209 and the second channel 210. The heat medium flows from the first channel 209 into the square chamber 215 and then into the second channel 210.

[0040] This embodiment is a variation of the first embodiment, in which several groups of curved portions 211 are replaced with square chambers 215. The flow channel design inside the heat-conducting support plate 2 includes a first channel 209 and a second channel 210 extending along its length, wherein the first channel 209 is connected to the water inlet 201, and the second channel 210 is connected to the water outlet 202. A square chamber 215 is provided between the two channels. The chamber is located below the limiting portion 207 of the heat-conducting portion 200 and is connected to the first and second channels 210. The heat medium first flows from the first channel 209 into the square chamber 215, is fully mixed in the chamber and evenly heats the support plate, and then flows into the second channel 210 for discharge. The provision of the square chamber 215 enables the heat medium to be more fully diffused and heat-exchanged before entering the second channel 210, thereby significantly improving the heat conduction efficiency and uniformity.

[0041] like Figure 7 As shown, a baking method for a baking device for a square aluminum shell battery cell includes the following steps: S1. Place the square aluminum shell battery cell to be baked in the limiting groove 206 of the tray 203 of the heat-conducting support plate 2, close the door panel 104 of the box 1, seal the cavity 106 with the sealing strip 105, start the heater, and supply heat medium to the heat-conducting support plate 2 through the water inlet pipe 100 for preheating for 5 minutes to raise the internal temperature of the battery cell to above 55°C; S2. Maintaining the baking temperature at no more than 100° C., perform the first stage baking for 400 minutes, and perform a nitrogen replacement cycle every 20 minutes, wherein nitrogen is filled into the cavity 106 through the charging module 3 to a vacuum degree of 10000 Pa, and the vacuum pump 400 of the exhaust assembly 4 is simultaneously started to evacuate the vacuum degree in the cavity 106 to 50-200 Pa; S3, performing the second stage baking for 300 minutes, and performing a nitrogen replacement cycle every 15 minutes, wherein nitrogen is filled into the cavity 106 through the charging module 3 to a vacuum degree of 5000 Pa, and the vacuum pump 400 of the exhaust component 4 is simultaneously started to evacuate the vacuum degree in the cavity 106 to 50-200 Pa; S4, performing the third stage baking for 200 minutes, and performing a nitrogen replacement cycle every 10 minutes, wherein nitrogen is filled into the cavity 106 through the charging module 3 to a vacuum degree of 3000 Pa, and the vacuum pump 400 of the exhaust component 4 is simultaneously started to evacuate the vacuum degree in the cavity 106 to 50-200 Pa; S5. Stop the heater and start the water circulation cooling system to cool the heat medium to below 50°C through the water outlet pipe 101. The cooling time is 50 minutes. After the surface temperature in the cavity 106 drops below 50°C, open the door panel 104 and take out the baked battery cell.

[0042] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A baking device for square aluminum shell battery cells, comprising a box (1) with a cavity (106) formed therein, a plurality of heat-conducting support plates (2) disposed in the cavity (106) for baking the battery cells, an inflation module (3) disposed on the box (1) for inflating the cavity (106), and an exhaust assembly (4) for extracting gas from the cavity (106), wherein: The plurality of heat-conducting support plates (2) are horizontally arranged in the cavity (106) of the box body (1) and are evenly distributed along the height direction of the box body (1). A water inlet pipe (100) and a water outlet pipe (101) in communication with the heat-conducting support plates (2) are arranged in the cavity (106). The water inlet pipe (100) is in communication with the water inlet (201) of the external heater, and the water outlet pipe (101) is in communication with the water return port of the heater. The water inlet pipe (100) transports the heat medium generated by the heater to the heat-conducting support plates (2). The heat-conducting support plates (2) bake the battery cores through heat conduction, and the heat medium flows back to the heater through the water outlet pipe (101) to form a circulation.

2. The baking device for square aluminum shell battery cells according to claim 1, characterized in that: The heat-conducting support plate (2) is provided with a heat-conducting portion (200), and a water inlet (201) and a water outlet (202) are provided at the left and right ends of the heat-conducting portion (200), respectively. The water inlet (201) is communicated with the water inlet pipe (100), and the water outlet (202) is communicated with the water outlet pipe (101). A flow channel is provided inside the heat-conducting portion (200) and passes through the water inlet (201) and the water outlet (202) for the circulation of a heat medium.

3. The baking device for square aluminum shell battery cells according to claim 2, characterized in that: A tray (203) for placing the battery cells to be baked is slidably provided on the heat-conducting support plate (2); a first contact surface (204) is provided on the top of the heat-conducting portion (200); a second contact surface (205) is provided on the bottom of the tray (203) and is in contact with the first contact surface (204); a limiting groove (206) matching the shape of the outer wall of the battery cell is provided on the top of the tray (203); and the bottom of the limiting groove (206) is in contact with the outer surface of the battery cell.

4. The baking device for square aluminum shell battery cells according to claim 3, characterized in that: The heat-conducting support plate (2) is provided with a limiting portion (207) located above the heat-conducting portion (200). The limiting portion (207) is in a U-shaped structure, extending from both sides and the rear of the heat-conducting portion (200) and surrounding upwards. An opening (208) is formed on the front side of the limiting portion (207). The tray (203) is horizontally pushed into the limiting portion (207) through the opening (208) and fits with the upper surface of the heat-conducting portion (200).

5. The baking device for square aluminum shell battery cells according to claim 2, characterized in that: The flow channel comprises a first channel (209) extending along the length direction of the heat-conducting support plate (2) and communicating with the water inlet (201), a second channel (210) arranged parallel to the first channel (209) and communicating with the water outlet (202), and a plurality of groups of curved portions (211) arranged between the first channel (209) and the second channel (210), each group of curved portions (211) comprising a first curved channel (212) and a second curved channel (213) extending along the width direction of the heat-conducting support plate (2), and a vertical channel (214) arranged perpendicular to the width direction, the two ends of the vertical channel (214) respectively communicating with the first curved channel (212) and the second curved channel (213); wherein the first curved channel (212) near the curved portion (211) of the first channel (209) is connected to the first channel (209), and the second curved channel (213) near the curved portion (211) of the second channel (210) is connected to the second channel (210).

6. The baking device for square aluminum shell battery cells according to claim 2, characterized in that: The first channel (209) extends along the length direction of the heat-conducting support plate (2) and is in communication with the water inlet (201); the second channel (210) is arranged parallel to the first channel (209) and is in communication with the water outlet (202); and the square chamber (215) is located between the first channel (209) and the second channel (210). The square chamber (215) is provided below the limiting portion (207) of the heat-conducting portion (200) and is in communication with the first channel (209) and the second channel (210). The heat medium flows from the first channel (209) into the square chamber (215) and then into the second channel (210).

7. The baking device for square aluminum shell battery cells according to claim 1, characterized in that: The box (1) is provided with a first temperature sensor (102) and a second temperature sensor (103); the first temperature sensor (102) is installed on the water inlet pipe (100) and is used to detect the temperature of the heat medium water entering the heat-conducting support plate (2); the second temperature sensor (103) is installed on the water outlet pipe (101) and is used to detect the temperature of the heat medium water after heat conduction through the heat-conducting support plate (2); the first temperature sensor (102) and the second temperature sensor (103) are connected to an external controller for communication so as to adjust the heat medium circulation parameters according to the water temperature difference.

8. The baking device for square aluminum shell battery cells according to claim 1, characterized in that: The inflation module (3) is configured as an air inlet pipe, which is installed at the rear end of the box (1). The air inlet pipe is connected to an external inflation device and is used to fill nitrogen gas into the cavity (106); The front outer wall of the box body (1) is connected to an openable and closable door panel (104) via a hinge, and a sealing strip (105) is provided on the inner edge of the door panel (104) for sealing the cavity (106) when closed.

9. The baking device for square aluminum shell battery cells according to claim 8, characterized in that: The air extraction component (4) comprises an air extraction pump (400) and an air outlet port (401), wherein the air outlet port (401) is arranged at the top of the box body (1) and communicates with the cavity (106), and the air extraction pump (400) is arranged at the rear end of the box body (1), and the air outlet pipe port is connected to the air extraction pump (400) via a pipeline.

10. A baking method for a baking device for square aluminum shell battery cells, characterized by: The following steps are involved: S1. Place the square aluminum shell battery cell to be baked in the limiting groove (206) of the tray (203) of the heat-conducting support plate (2), close the door panel (104) of the box (1), seal the cavity (106) with the sealing strip (105), start the heater, and transport the heat medium to the heat-conducting support plate (2) through the water inlet pipe (100) for preheating for 5 minutes to raise the internal temperature of the battery cell to above 55°C; S2, maintaining the baking temperature at no more than 100°C, performing the first stage baking for 400 minutes, and performing a nitrogen replacement cycle every 20 minutes, wherein nitrogen is filled into the cavity (106) through the charging module (3) to a vacuum degree of 10000Pa, and the vacuum pump (400) of the vacuum component (4) is simultaneously started to draw the vacuum degree in the cavity (106) to 50-200Pa; S3, performing the second stage baking for 300 minutes, and performing a nitrogen replacement cycle every 15 minutes, wherein nitrogen is charged into the cavity (106) through the charging module (3) to a vacuum degree of 5000Pa, and the vacuum pump (400) of the vacuum component (4) is simultaneously started to pump the vacuum degree in the cavity (106) to 50-200Pa; S4, performing the third stage baking for 200 minutes, and performing a nitrogen replacement cycle every 10 minutes, wherein nitrogen is charged into the cavity (106) through the charging module (3) to a vacuum degree of 3000Pa, and the vacuum pump (400) of the vacuum component (4) is simultaneously started to pump the vacuum degree in the cavity (106) to 50-200Pa; S5. Stop the heater and start the water circulation cooling system to cool the heat medium to below 50°C through the water outlet pipe (101). The cooling time is 50 minutes. After the surface temperature in the cavity (106) drops below 50°C, open the door panel (104) and take out the baked battery cell.

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