Liquid cooling plate welding process control method, liquid cooling plate structure and battery pack

Abstract

The invention provides a liquid cooling plate welding process control method, a liquid cooling plate structure and a battery pack, and the liquid cooling plate welding process control method accurately identifies a welding position by receiving position information sent by monitoring equipment, and writes a laser wire filling welding moving path, so that accurate welding of a complex structure of a liquid cooling plate is realized, and the welding quality of the liquid cooling plate is improved. The welding precision and efficiency are improved, the automation degree is high, the welding area is small, the limitation of a traditional welding method during large gap treatment is overcome, and the welding speed and quality are greatly improved. According to the liquid cooling plate structure and the battery pack, the point where the cooling liquid is easy to leak is located outside the battery box, so that the influence of leakage of the cooling liquid on the battery box is avoided. The liquid cooling plate structure is arranged on the battery box, and the battery box is fixed on the mounting space of the liquid cooling plate structure, so that the mounting points of the liquid cooling plate structure and the battery box do not occupy the internal space of the battery box, more storage space is provided for the battery module, and the total capacity of the battery pack is directly improved.

Description

Technical Field

[0001] The present application relates to the field of new energy battery technology, and in particular to a liquid cooling plate welding process control method, a liquid cooling plate structure and a battery pack. Background Art

[0002] At present, the design of liquid cooling plates on the market generally has the problem of complex structure. In the design of the liquid cooling system of the existing battery box, the entire structure of the liquid cooling plate is usually encapsulated together with the battery module inside the box to achieve effective thermal management of the battery pack. Although this layout ensures a short heat conduction path, it places extremely high requirements on the air tightness of the liquid cooling plate, requires strict air tightness testing, and increases production costs. Due to the complex environment inside the battery box, once the liquid cooling plate leaks, the consequences will be catastrophic. As the core component of the battery box liquid cooling system, the liquid cooling plate has a complex structure and contains multiple connection points and sealing parts, especially key parts such as the water inlet, water outlet, and connecting pipes. Due to long-term exposure to high pressure, high temperature and corrosive environment, it is very easy to cause wear, aging or sealing failure, resulting in coolant leakage. The internal environment of the battery box is complex, containing a large number of sensitive components such as battery cells, circuits, and connecting wires. Any small leakage may cause direct contact between the coolant and the battery cells. This will not only cause serious consequences such as short circuits and corrosion, but also pose a serious threat to the safety and service life of the battery pack.

[0003] Secondly, limited by the current design concept of battery boxes, the power of a single box is generally maintained at around 35kW·h, which is difficult to meet the growing demand for high endurance. The main reason for this limitation is that the space inside the battery box is not used efficiently. Specifically, since there are usually installation points on both sides of the liquid cooling plate, these installation points limit the available space in the battery box, the arrangement density and overall power of the battery cells, and the storage space of the battery cells is limited.

[0004] Furthermore, the design of liquid cooling plates in existing commercial vehicle battery boxes often focuses on heat conduction efficiency, resulting in complex structures and large volumes, which in turn increases the demand for coolant. This not only increases the overall weight of the battery system and affects the vehicle's energy efficiency, but also increases manufacturing costs and maintenance difficulties. At the same time, although the extensive use of metal materials such as aluminum alloys has improved the strength and corrosion resistance of the structure, the excessive use of aluminum alloy materials has led to an increase in material costs and increased resource consumption.

[0005] In addition, in the current preparation process of liquid cooling plates, traditional welding processes often seem to be unable to cope with the complex structure of liquid cooling plates, especially when dealing with large gaps or delicate parts, it is difficult to ensure the quality stability after welding. This not only affects the overall performance of the liquid cooling plate, but may also cause leakage problems in subsequent airtightness testing due to welding defects, increasing the failure rate and maintenance cost of the product.

[0006] Finally, traditional welding methods often have difficulty achieving the ideal fusion effect when dealing with large gap areas in liquid cooling plates. Porosity, slag inclusions and other defects are easily left in the weld, which not only weakens the strength of the weld, but also becomes a hidden danger for airtightness detection. In addition, the heat-affected zone of traditional welding processes is large, and the thermal damage to the parent material is significant, which can easily lead to deformation of components after welding and accumulation of residual stress, further reducing the reliability and service life of the product. Since the liquid cooling plate needs to withstand high temperatures and pressures during operation, if the welding is not firm or there are defects, it will cause coolant leakage, which will affect the safety and life of the battery pack. Summary of the invention

[0007] In view of the shortcomings of the prior art mentioned above, the purpose of the present application is to provide a liquid cooling plate welding process control method, a liquid cooling plate structure and a battery pack, which are used to solve the technical problems that the traditional welding process in the prior art is difficult to ensure the quality stability after welding when facing the complex structure of the liquid cooling plate, and the part of the liquid cooling plate that is prone to leakage is located inside the battery box, which may cause safety hazards, and the low power of a single box.

[0008] To achieve the above-mentioned purpose and other related purposes, the first aspect of the present application provides a liquid cooling plate welding process control method, which is applied to a computer device, and the computer device is respectively communicated with a laser welding device and a monitoring device. The liquid cooling plate welding process control method includes: receiving position information sent by a monitoring device for monitoring the position of the liquid cooling plate, and identifying a number of welding positions based on the position information; writing a laser wire filling welding movement path based on the several welding positions; and sending a start instruction to the laser welding device, so that the laser welding device welds each component on the liquid cooling plate in turn according to the laser wire filling welding movement path to form a liquid cooling plate structure.

[0009] In some embodiments of the first aspect of the present application, the computer device is also communicatively connected to a wire filling device and a thermal imaging device; a start instruction is issued to the laser welding device so that the laser welding device sequentially welds the various components on the liquid cooling plate according to the laser wire filling welding moving path to form a liquid cooling plate structure, including: issuing a start instruction to the laser welding device, and according to a preset wire feeding speed, a preset wire feeding amount and a laser wire filling welding moving path, the wire filling device is ordered to perform a wire filling operation on the welding area corresponding to the current welding position, and the laser welding device is ordered to perform a welding operation on the current welding position of the liquid cooling plate; the thermal imaging device is ordered to collect a thermal image of the welding area corresponding to the current welding position, and according to the collected thermal image, the welding parameters of the laser welding device are adjusted to complete the welding of the current welding position; the above-mentioned wire filling operation and welding operation are repeated to complete the welding of each welding position to form a liquid cooling plate structure.

[0010] In some embodiments of the first aspect of the present application, the computer device is also communicatively connected to a welding positioning tool, and the monitoring device is arranged on the welding positioning tool; wherein, the method of receiving the position information sent by the monitoring device for monitoring the position of the liquid cooling plate, and identifying a number of welding positions based on the position information includes: when it is monitored that the liquid cooling plate is located on the welding positioning tool, the monitoring device is ordered to collect the position information of the liquid cooling plate on the welding positioning tool, and send it to the computer device; based on the received position information, the coordinate information of each component on the liquid cooling plate is identified; according to the preset welding rules and the coordinate information of each component on the liquid cooling plate, a number of welding positions are identified.

[0011] To achieve the above-mentioned purpose and other related purposes, the second aspect of the present application provides a liquid cooling plate structure, which is manufactured and formed according to the liquid cooling plate welding process control method as described above; the liquid cooling plate structure is used for heat exchange of the battery box; the liquid cooling plate structure comprises: a cooling plate body, a water inlet and a water outlet; wherein, the cooling plate body is provided with an installation space for installing the battery box; the water inlet and the water outlet are both arranged at one end of the cooling plate body along its length direction, and are both located outside the installation space; a flow water channel for the circulation of cooling liquid is provided in the cooling plate body; the water inlet and the water outlet are respectively connected to the flow water channel; the cooling liquid enters the flow water channel from the water inlet and exchanges heat with the battery box, and then flows out from the water outlet.

[0012] In some embodiments of the second aspect of the present application, a plug is further included, and the plug is arranged outside the installation space.

[0013] In some embodiments of the second aspect of the present application, a first limiting bracket and a second limiting bracket are further included, wherein the first limiting bracket is fixed to one end of the cooling plate body along its length direction, and the second limiting bracket is fixed to the other end of the cooling plate body along its length direction.

[0014] In some embodiments of the second aspect of the present application, a first protective plate and a second protective plate are also included, the first protective plate is fixed to one end of the cooling plate body along its width direction, and the second protective plate is fixed to the other end of the cooling plate body along its width direction; the first limiting bracket, the second limiting bracket, the first protective plate and the second protective plate together form the installation space.

[0015] In some embodiments of the second aspect of the present application, the cooling plate body includes a first waterway plate and a second waterway plate connected to the first waterway plate; the flow waterway is respectively arranged in the first waterway plate and the second waterway plate; the water inlet is arranged at one end of the first waterway plate along its length direction, and the water outlet is arranged at one end of the second waterway plate along its length direction.

[0016] In some embodiments of the second aspect of the present application, the thickness of the upper and lower walls of the cooling plate body ranges from 1 mm to 1.5 mm, and the height of the flow channel ranges from 3.5 mm to 4 mm.

[0017] To achieve the above-mentioned purpose and other related purposes, the third aspect of the present application provides a battery pack, including: a fixed frame; a battery box; the liquid cooling plate structure as described above, wherein the battery box is fixed on the installation space of the liquid cooling plate structure; a fixing portion is provided at the bottom of the cooling plate body, and the battery box is installed on the fixed frame through the fixing portion.

[0018] As described above, the liquid cooling plate welding process control method, liquid cooling plate structure and battery pack of the present application have the following beneficial effects:

[0019] In the present application, the liquid cooling plate welding process control method receives the position information sent by the monitoring device for monitoring the position of the liquid cooling plate, and identifies several welding positions according to the position information; writes the laser wire welding moving path according to the several welding positions; sends a start instruction to the laser welding device, so that the laser welding device welds the various components on the liquid cooling plate in sequence according to the laser wire welding moving path to form a liquid cooling plate structure, and accurately identifies the welding position by receiving the position information sent by the monitoring device, and writes the laser wire welding moving path, thereby realizing the accurate welding of the complex structure of the liquid cooling plate, improving the welding accuracy and efficiency, high degree of automation, small welding area, and no pores and other influencing factors appearing in the weld. At the same time, the manufacturing process is fast, time is saved, the production cycle is shortened, and production efficiency is improved, which not only overcomes the limitations of traditional welding methods in processing large gaps, but also greatly improves the speed and quality of welding. By accurately controlling the energy, moving path and welding process of the laser beam, the defects in the weld can be significantly reduced, the stability and reliability of the welding quality can be improved, the integrity and reliability of the liquid cooling plate structure can be ensured, thereby extending the service life of the product and reducing the failure rate and maintenance cost. Furthermore, laser wire welding technology has high welding quality, beautiful welds, high strength, and can meet high-precision and high-demand welding needs. It also has the characteristics of high thermal energy density and low heat input, which can significantly reduce the heat-affected zone, reduce thermal damage to the parent material, and reduce deformation and residual stress of components after welding, further improving product quality and reliability.

[0020] In the liquid cooling plate structure of the present application, the coolant enters the flow channel from the water inlet and exchanges heat with the battery box before flowing out from the water outlet. Since the water inlet and the water outlet are both arranged outside the installation space for installing the battery box, even if leakage occurs, the coolant will not directly contact the battery cell, thereby avoiding safety hazards such as short circuit and corrosion, greatly reducing the failure of the battery module in the battery box caused by the leakage of coolant, ensuring the stable operation of the battery module, and reducing the damage and maintenance costs of the battery module caused by the leakage of coolant, as well as the production loss caused by downtime, so that the overall cost is effectively controlled. In addition, when the coolant leaks, since the leakage point is located outside the battery box, maintenance personnel can more easily locate and repair the problem without disassembling the battery box or interfering with the normal operation of the battery module, simplifying the maintenance process, reducing maintenance costs, and reducing the downtime of the battery module caused by maintenance. Finally, the liquid cooling plate structure is more lightweight and ensures sufficient mechanical properties, thereby reducing the use of metal materials such as aluminum alloy and the coolant required for refrigeration, and effectively reducing production costs.

[0021] In the battery pack of the present application, the battery box is fixed on the installation space of the liquid cooling plate structure, so that the installation points of the liquid cooling plate structure and the battery box do not occupy the internal space of the battery box, thereby providing more storage space for the battery modules. The increased module storage space allows more battery modules to be installed in the battery box of the same volume, directly increasing the overall capacity of the battery pack. Furthermore, by setting the installation point of the battery box at the bottom of the cooling plate body, the installation space for installing the battery box in the liquid cooling plate structure can also be increased, so that a larger battery box can be accommodated in the installation space, further increasing the overall capacity of the battery pack and improving the cruising range of the electric vehicle. In addition, since the point where the coolant is easily leaked in the liquid cooling plate structure is located outside the battery box, the influence of the coolant leakage on the battery box is avoided, and the failure of the battery module in the battery box caused by the coolant leakage is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a flow chart of a method for controlling a liquid cooling plate welding process in one embodiment of the present application.

[0023] Figure 2 Shown is a schematic diagram of a process for identifying a welding position in an embodiment of the present application.

[0024] Figure 3 It is a schematic diagram of the process of laser wire welding in one embodiment of the present application.

[0025] Figure 4 Shown is a schematic block diagram of a liquid cooling plate welding process control system in one embodiment of the present application.

[0026] Figure 5 Shown is a structural schematic diagram of a liquid cooling plate structure in one embodiment of the present application.

[0027] Figure 6 Shown is a side view of a liquid cooling plate structure in one embodiment of the present application.

[0028] Figure 7 Shown is a partial structural schematic diagram of a liquid cooling plate structure in one embodiment of the present application.

[0029] Figure 8 Shown is a schematic diagram of the installation space for installing a battery box in a liquid cooling plate structure in one embodiment of the present application.

[0030] Fig. 9 Shown is a schematic diagram of the bottom installation points in the liquid cooling plate structure in one embodiment of the present application.

[0031] Component number description

[0032] 1 Cooling plate body

[0033] 11 First waterway plate

[0034] 12 Second waterway plate

[0035] 13 Flowing Waterway

[0036] 14 Fixing holes

[0037] 2 Water inlet

[0038] 3 Water outlet

[0039] 4 Plug

[0040] 5 First limit bracket

[0041] 6 Second limit bracket

[0042] 7 First protective plate

[0043] 8 Second protective plate

[0044] 400 Liquid Cooling Plate Welding Process Control System

[0045] 401 Computer Equipment

[0046] 402 Laser welding equipment

[0047] 403 Monitoring Device DETAILED DESCRIPTION

[0048] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0049] Before further describing the present invention in detail, the nouns and terms involved in the embodiments of the present invention are explained. The nouns and terms involved in the embodiments of the present invention are applicable to the following interpretations:

[0050] <1> TIG welding (Tungsten Inert Gas Welding): non-melting inert gas shielded arc welding is an arc welding method that uses external gas as a protective medium.

[0051] <2> MIG welding (Metal Inert Gas Welding) is an arc welding method that uses a melting electrode and an additional gas as the arc medium to protect the molten metal droplets, welding pool and high-temperature metal in the welding area.

[0052] In order to solve the problems in the above-mentioned background technology, the present invention provides a liquid cooling plate welding process control method, a liquid cooling plate structure and a battery pack, aiming to solve the technical problems that the traditional welding process in the prior art is difficult to ensure the quality stability after welding when facing the complex structure of the liquid cooling plate, the part of the liquid cooling plate that is prone to leakage is located inside the battery box, which may cause safety hazards, and the low power of a single box.

[0053] To facilitate understanding of the embodiments of the present application, first Figure 1 Detailed description. Figure 1 The flow chart of the liquid cooling plate welding process control method in the embodiment of the present invention is shown. The liquid cooling plate welding process control method in the embodiment is applied to a computer device, and the computer device is respectively connected to the laser welding device and the monitoring device for communication. The liquid cooling plate welding process control method mainly includes the following steps:

[0054] S101: receiving position information sent by a monitoring device for monitoring the position of a liquid cooling plate, and identifying a plurality of welding positions according to the position information.

[0055] In this embodiment, if Figure 2As shown, a schematic diagram of the process of identifying welding positions in an embodiment of the present invention is shown. The computer device is also communicatively connected to the welding positioning tool, and the monitoring device is arranged on the welding positioning tool; wherein, receiving the position information sent by the monitoring device for monitoring the position of the liquid cooling plate, and identifying a plurality of welding positions according to the position information includes:

[0056] S1011: When it is detected that the liquid cooling plate is located on the welding positioning fixture, the monitoring device is instructed to collect position information of the liquid cooling plate on the welding positioning fixture and send the information to the computer device.

[0057] In this embodiment, a locking mechanism is also provided on the welding positioning fixture, and the locking mechanism is connected to the computer device in communication. When the liquid cooling plate is detected to be on the welding positioning fixture, the locking mechanism is clamped and fixed to each component of the liquid cooling plate, and the monitoring device is made to collect the position information of the liquid cooling plate on the welding positioning fixture and send it to the computer device. The locking mechanism clamps and fixes each component of the liquid cooling plate to ensure that the entire liquid cooling plate will not shift or deform during the welding process, which can ensure the stability of the liquid cooling plate during the welding process, reduce the generation of welding defects (such as cracks, slag inclusions, etc.), and thus improve the overall quality of welding.

[0058] S1012: Identify coordinate information of each component on the liquid cooling plate according to the received position information.

[0059] In this embodiment, the monitoring equipment includes but is not limited to: industrial cameras, laser rangefinders, displacement sensors, etc. Exemplarily, the industrial camera can transmit the collected position information to the computer device in real time, and use image processing algorithms such as edge detection and contour extraction to identify the features of each component on the liquid cooling plate. The computer device pre-produces template images of each component on the liquid cooling plate, and matches these template images with the identified features. By calculating the similarity between the template image and the identified features, the position of each component can be determined, and through coordinate conversion, the coordinate information of each component on the liquid cooling plate can be identified.

[0060] In this embodiment, during the liquid cooling plate welding process, the laser rangefinder can accurately measure the position information of the liquid cooling plate on the welding positioning tooling, thereby determining the position of the liquid cooling plate. The computer device identifies the coordinate information of each component on the liquid cooling plate based on the received position information.

[0061] In this embodiment, during the welding process of the liquid cooling plate, the displacement sensor can be installed on the welding positioning tool to measure the position information of the liquid cooling plate on the welding positioning tool.

[0062] S1013: Identify a number of welding positions according to preset welding rules and coordinate information of each component on the liquid cooling plate.

[0063] In this embodiment, the preset welding rules include but are not limited to: welding type, welding parameters, welding sequence, preset welding position, etc. According to the preset welding rules and the coordinate information of each component on the liquid cooling plate, the specific welding position is determined in combination with the preset welding rules.

[0064] In this embodiment, the welding type is determined according to the material, thickness and type of parts to be connected of the liquid cooling plate, such as spot welding, seam welding, TIG welding, MIG welding, etc. The welding parameters include laser power, welding speed, wire feeding speed, wire feeding amount, welding distance, beam diameter, focal position, etc. These parameters need to be adjusted according to the specific material, thickness and welding position of the liquid cooling plate to ensure the welding quality. In the early stage of welding, manual welding can be performed, and then pre-welding orthogonal tests, air tightness tests, mechanical properties and macroscopic morphology observations can be performed to determine the specific welding parameters. The welding sequence is determined according to the structure and welding requirements of the liquid cooling plate to determine the welding sequence of each component to avoid deformation or stress concentration during welding. The preset welding position is determined based on the specific welding position in combination with the welding type and parameters.

[0065] S102: programming a laser wire-filling welding moving path according to the plurality of welding positions.

[0066] In this embodiment, according to the several welding positions, the specific position coordinates of each welding point and the welding sequence are clarified, the welding path is planned, and the weld map of all welds is drawn, including the starting point, end point, turning point and the outline of each weld. According to the weld map, the welding path of each welding position is defined: for a straight weld, the coordinates of the starting point and the end point are directly input. For a curved weld, the curve drawing tool in the software can be used, or the curve can be approximated by entering a series of points. Wire feeding instructions are set at each key point or interval of the welding path, including the start and end time of wire feeding, wire feeding speed, etc. Ensure the synchronization of wire feeding instructions with laser welding instructions to avoid welding defects. Simulate each welding path, check the continuity and accuracy of the path, ensure smooth connection between each welding path, and avoid pauses and repetitions during welding. According to the simulation results, adjust the path points, wire feeding instructions and welding parameters to generate a laser wire welding movement path.

[0067] S103: issuing a start instruction to the laser welding equipment, so that the laser welding equipment sequentially welds the components on the liquid cooling plate according to the laser wire welding moving path to form a liquid cooling plate structure.

[0068] In this embodiment, if Figure 3 As shown, a schematic diagram of the process of laser wire-filling welding in an embodiment of the present invention is shown. The computer device is also connected to the wire-filling device and the thermal imaging device in communication; a start instruction is issued to the laser welding device, so that the laser welding device sequentially welds the various components on the liquid cooling plate according to the laser wire-filling welding moving path, so as to form a liquid cooling plate structure in a manner including:

[0069] S1031: Send a start command to the laser welding equipment, and according to the preset wire feeding speed, the preset wire feeding amount and the laser wire filling welding moving path, instruct the wire filling equipment to perform a wire filling operation on the welding area corresponding to the current welding position, and instruct the laser welding equipment to perform a welding operation on the current welding position of the liquid cooling plate.

[0070] In this embodiment, at each welding position, the laser welding head of the laser welding device focuses and melts the parent material, while the wire filling device synchronously delivers the welding wire to the welding area. The amount of welding wire fed is based on the convexity of the welded surface and the overall forming quality. The weld convex profile is similar to the droplet profile. The welding wire melts under laser heating to achieve complete filling of the welding area and fuse with the parent material to form a weld. The wire filling device operates synchronously with the laser welding device to ensure that the welding wire can be accurately filled into the welding area and form a good weld with the parent material.

[0071] S1032: Instruct the thermal imaging device to collect thermal images of the welding area corresponding to the current welding position, and adjust the welding parameters of the laser welding device according to the collected thermal images to complete the welding of the current welding position.

[0072] In this embodiment, the collected thermal images are preprocessed, such as denoising, contrast enhancement, etc., to improve image quality and analysis accuracy. The temperature distribution information of the welding area is extracted from the thermal image using the temperature measurement function of the thermal imaging device. According to the preset temperature threshold or temperature gradient change, a preset welding parameter adjustment strategy is formulated. For example, if the temperature of the welding area is detected to be too high, it is necessary to reduce the laser power or increase the welding speed to prevent overheating. The temperature distribution information obtained by analysis is combined with the preset welding parameter adjustment strategy to adjust the welding parameters of the laser welding equipment in real time, such as laser power, welding speed, wire feeding speed, etc.

[0073] In this embodiment, the working principle of the thermal imaging device is based on the phenomenon that all objects generate heat and radiate infrared rays. By detecting the infrared rays radiated from the surface of the object, the thermal imaging device can convert it into a visible thermal image, thereby intuitively displaying the temperature distribution on the surface of the object. These images usually use different colors to represent different temperature ranges, such as red and pink represent higher temperatures, while blue and green represent lower temperatures.

[0074] S1033: Repeat the above-mentioned wire filling operation and welding operation to complete the welding of each welding position to form a liquid cooling plate structure.

[0075] In this embodiment, the above-mentioned wire filling operation and welding operation are repeated in accordance with the welding sequence. The first step is to weld the first water channel plate 11 and the second water channel plate 12 together. The second step is to weld the plug 4 to both ends of the cooling plate body 1 along its length direction. The third step is to weld the water inlet nozzle 2 and the water outlet nozzle 3 to the cooling plate body 1. The fourth step is to weld the first limiting bracket 5 and the second limiting bracket 6 to both ends of the cooling plate body 1 along its length direction. The fifth step is to weld the first protective plate 7 and the second protective plate 8 to both ends of the cooling plate body 1 along its width direction to complete the welding of each welding position to form a liquid cooling plate structure.

[0076] In this embodiment, the method further includes: performing an airtightness test on the liquid cooling plate structure to determine whether the welding quality of the liquid cooling plate structure is qualified.

[0077] In this embodiment, the computer device is also communicatively connected to a detection device, the detection device includes a gas tank, a solenoid valve and a pressure gauge, and the solenoid valve and the pressure gauge are communicatively connected to the computer device respectively; wherein the method of performing air tightness detection on the liquid cooling plate structure includes:

[0078] (1) Control the solenoid valve to open, so that the gas in the gas tank is automatically filled into the liquid cooling plate structure based on the air pressure, and the gas pressure value in the liquid cooling plate structure is monitored by the pressure gauge. In this way, the gas pressure inside the liquid cooling plate structure is established.

[0079] (2) When the gas pressure value reaches a preset gas pressure parameter, the solenoid valve is controlled to close, thereby ensuring that the gas pressure inside the liquid cooling plate structure reaches a stable and measurable level.

[0080] (3) The pressure gauge is used to monitor whether the gas pressure value changes within a preset time range, and whether the welding quality of the liquid cooling plate structure is qualified is determined based on the monitoring result.

[0081] In this embodiment, the pressure gauge is used to monitor whether the gas pressure value changes within a preset time range. If the gas pressure remains unchanged, it indicates that the welding quality of the liquid cooling plate structure is good and there is no leakage. If the gas pressure drops, it indicates that there is a leakage and the welding quality is unqualified.

[0082] In the present application, the liquid cooling plate welding process control method receives the position information sent by the monitoring device for monitoring the position of the liquid cooling plate, and identifies several welding positions according to the position information; writes the laser wire welding moving path according to the several welding positions; sends a start instruction to the laser welding device, so that the laser welding device welds the various components on the liquid cooling plate in sequence according to the laser wire welding moving path to form a liquid cooling plate structure, and accurately identifies the welding position by receiving the position information sent by the monitoring device, and writes the laser wire welding moving path, thereby realizing the accurate welding of the complex structure of the liquid cooling plate, improving the welding accuracy and efficiency, high degree of automation, small welding area, and no pores and other influencing factors appearing in the weld. At the same time, the manufacturing process is fast, time is saved, the production cycle is shortened, and production efficiency is improved, which not only overcomes the limitations of traditional welding methods in processing large gaps, but also greatly improves the speed and quality of welding. By accurately controlling the energy, moving path and welding process of the laser beam, the defects in the weld can be significantly reduced, the stability and reliability of the welding quality can be improved, the integrity and reliability of the liquid cooling plate structure can be ensured, thereby extending the service life of the product and reducing the failure rate and maintenance cost. Furthermore, laser wire welding technology has high welding quality, beautiful welds, high strength, and can meet high-precision and high-demand welding needs. It also has the characteristics of high thermal energy density and low heat input, which can significantly reduce the heat-affected zone, reduce thermal damage to the parent material, and reduce deformation and residual stress of components after welding, further improving product quality and reliability.

[0083] Figure 4 Schematic diagram of the liquid cooling plate welding process control system provided in the embodiment of the present application. Figure 4 As shown, the liquid cooling plate welding process control system 400 includes a computer device 401, a laser welding device 402 and a monitoring device 403. The computer device 401 is respectively connected to the laser welding device 402 and the monitoring device 403. The monitoring device 403 is used to collect the position information of the liquid cooling plate, and the laser welding device 402 is used to weld the various components on the liquid cooling plate in sequence.

[0084] In this embodiment, the computer device 401 receives position information sent by a monitoring device 403 for monitoring the position of a liquid cooling plate, and identifies a number of welding positions based on the position information; writes a laser wire-filling welding moving path based on the number of welding positions; and sends a start instruction to the laser welding device 402, so that the laser welding device 402 welds the various components on the liquid cooling plate in sequence according to the laser wire-filling welding moving path to form a liquid cooling plate structure.

[0085] In this embodiment, the computer device is also communicatively connected to the welding positioning tool, and the monitoring device 403 is arranged on the welding positioning tool.

[0086] In this embodiment, the computer device 401 is also connected to the wire filling device and the thermal imaging device in communication; a start instruction is issued to the laser welding device 402, so that the laser welding device 402 welds the components on the liquid cooling plate in sequence according to the laser wire filling welding moving path, so as to form the liquid cooling plate structure. The method includes:

[0087] (1) A start command is issued to the laser welding device 402, and according to a preset wire feeding speed, a preset wire feeding amount, and a laser wire-filling welding moving path, the wire-filling device is instructed to perform a wire-filling operation on the welding area corresponding to the current welding position, and the laser welding device 402 is instructed to perform a welding operation on the current welding position of the liquid cooling plate.

[0088] (2) The thermal imaging device is instructed to collect a thermal image of the welding area corresponding to the current welding position, and the welding parameters of the laser welding device 402 are adjusted according to the collected thermal image to complete the welding of the current welding position.

[0089] (3) Repeat the above-mentioned wire filling operation and welding operation to complete the welding of each welding position to form a liquid cooling plate structure.

[0090] It should be understood that the specific process of each module executing the above corresponding steps has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0091] like Figure 5-8 The present application also provides a liquid cooling plate structure, which is manufactured according to the liquid cooling plate welding process control method as described above; the liquid cooling plate structure is used for heat exchange of the battery box; the liquid cooling plate structure comprises: a cooling plate body 1, a water inlet nozzle 2 and a water outlet nozzle 3; wherein, the cooling plate body 1 is provided with an installation space for installing the battery box; the water inlet nozzle 2 and the water outlet nozzle 3 are both arranged at one end of the cooling plate body 1 along its length direction, and are both located outside the installation space; a flow water channel 13 for the circulation of the coolant is provided in the cooling plate body 1; the water inlet nozzle 2 and the water outlet nozzle 3 are respectively connected to the flow water channel 13; after the coolant enters the flow water channel 13 from the water inlet nozzle 2 and exchanges heat with the battery box, it flows out from the water outlet nozzle 3.

[0092] In this embodiment, in the liquid cooling plate structure of the present application, the coolant enters the flow channel 13 from the water inlet 2 and exchanges heat with the battery box, and then flows out from the water outlet 3. Since the water inlet 2 and the water outlet 3 are both arranged outside the installation space for installing the battery box, even if leakage occurs, the coolant will not directly contact the battery cell, thereby avoiding safety hazards such as short circuit and corrosion, greatly reducing the failure of the battery module in the battery box caused by the leakage of coolant, ensuring the stable operation of the battery module, and reducing the damage and maintenance costs of the battery module caused by the leakage of coolant, as well as the production loss caused by downtime, so that the overall cost is effectively controlled. In addition, when the coolant leaks, since the leakage point is located outside the battery box, maintenance personnel can more easily locate and repair the problem without disassembling the battery box or interfering with the normal operation of the battery module, simplifying the maintenance process, reducing maintenance costs, and reducing the downtime of the battery module caused by maintenance.

[0093] In this embodiment, if Figure 5-6 As shown, the liquid cooling plate structure further includes a plug 4, which is arranged outside the installation space. In this way, the plug 4 integrally seals the flow channel 13 arranged in the cooling plate body 1, so that the coolant flows smoothly in the flow channel 13, thereby preventing the coolant from leaking and causing a decrease in cooling efficiency.

[0094] In this embodiment, a cavity and a socket connected to the cavity are provided in the cooling plate body 1, and the cavity is divided into the flow channel 13 by a plurality of dividing ribs, and the plug 4 is provided in the socket. The cavity is divided into a plurality of flow channels 13 by a plurality of dividing ribs, and each flow channel 13 is connected end to end. The coolant enters from the water inlet 2, flows through each flow channel 13 in turn, and flows out from the water outlet 3, forming a complete closed-loop pipeline cycle with only one inlet and one outlet, changing and optimizing the flow path and heat exchange efficiency of the coolant. By increasing the number of flow channels 13, the flow path of the coolant in the cooling plate body 1 is extended, so that the coolant has more time to exchange heat with the battery box installed on the cooling plate body 1, which helps the coolant to absorb heat more fully during the flow process, thereby improving the heat conduction efficiency and achieving efficient heat dissipation. If the plug 4 is damaged or leaks, the maintenance personnel can quickly replace it through the socket without disassembling the entire cooling plate body 1 or interfering with the normal operation of other components. In addition, since the plug 4 is arranged outside the installation space for installing the battery box, even if leakage occurs, it will not directly affect the safety of the battery module.

[0095] In this embodiment, if Figure 5As shown, the sockets connected to the cavity are respectively arranged at both ends of the cooling plate body 1 along its length direction, and the plug 4 is fixed in the sockets at both ends of the cooling plate body 1 along its length direction by laser welding. In this way, the plug 4 is arranged in the socket, which can prevent the coolant from leaking out from the sockets at both ends of the cooling plate body 1, ensuring the stable flow of the coolant in the cooling plate body 1. During transportation, installation and use, the plug 4 can tightly seal the socket to ensure that the coolant will not leak out.

[0096] In this embodiment, if Figure 5 As shown, the liquid cooling plate structure also includes a first limiting bracket 5 and a second limiting bracket 6, wherein the first limiting bracket 5 is fixed to one end of the cooling plate body 1 along its length direction, and the second limiting bracket 6 is fixed to the other end of the cooling plate body 1 along its length direction. The first limiting bracket 5 and the second limiting bracket 6 are fixed to both ends of the cooling plate body 1 by bolts, and are sealed at the contacting parts with the cooling plate body 1. The first limiting bracket 5 and the second limiting bracket 6 can prevent the battery module in the battery box from sliding or shifting along the length direction of the cooling plate body 1 due to vibration, impact or other external factors, thereby ensuring the stability and safety of the battery module in the battery box.

[0097] In this embodiment, if Figure 5 As shown, the liquid cooling plate structure also includes a first protective plate 7 and a second protective plate 8, wherein the first protective plate 7 is fixed to one end of the cooling plate body 1 along its width direction, and the second protective plate 8 is fixed to the other end of the cooling plate body 1 along its width direction; the first limiting bracket 5, the second limiting bracket 6, the first protective plate 7 and the second protective plate 8 jointly form the installation space. The battery box is fixed in the installation space jointly formed by the first limiting bracket 5, the second limiting bracket 6, the first protective plate 7 and the second protective plate 8, so that the parts of the liquid cooling plate structure that are prone to leakage are all located outside the battery box, avoiding the influence of coolant leakage on the battery box, reducing the failure of the battery module in the battery box caused by coolant leakage, and ensuring the stable operation of the battery module.

[0098] In this embodiment, if Figure 5As shown, the materials of the first protective plate 7 and the second protective plate 8 are both polycarbonate sheets (PC sheets), which are thermoplastic plastic sheets. In this way, the first protective plate 7 and the second protective plate 8 can not only prevent the battery module in the battery box from sliding or shifting along the width direction of the cooling plate body 1 due to vibration, impact or other external factors, but also play an insulating role, and can form an effective insulating barrier between the battery module and the external environment, preventing the battery module from malfunctioning due to external electromagnetic interference or short circuit, thereby ensuring the stability and safety of the battery module in the battery box.

[0099] In this embodiment, if Figure 5 As shown, the cooling plate body 1 includes a first waterway plate 11 and a second waterway plate 12 connected to the first waterway plate 11; the flow waterway 13 is respectively arranged in the first waterway plate 11 and the second waterway plate 12; the water inlet 2 is arranged at one end of the first waterway plate 11 along its length direction, and the water outlet 3 is arranged at one end of the second waterway plate 12 along its length direction. The water inlet 2 and the water outlet 3 are respectively fixed to the first waterway plate 11 and the second waterway plate 12 by laser welding. The flow channel 13 arranged on the first waterway plate 11 and the flow channel 13 arranged on the second waterway plate 12 are interconnected, so that when the coolant enters the first waterway plate 11 from the water inlet 2, it first flows through the flow channel 13 on the first waterway plate 11, then enters the second waterway plate 12, continues to flow along the preset flow channel 13, and after heat exchange with the battery module in the battery box, flows out from the water outlet 3, completing a complete cycle, realizing effective heat exchange and heat dissipation, and ensuring that the coolant can flow through the battery module evenly, take away heat and maintain stable operation of the system.

[0100] In this embodiment, if Figure 8 As shown, the length of the installation space is 1000 mm and the width is 600 mm.

[0101] In this embodiment, the thickness of the upper and lower walls of the cooling plate body 1 is in the range of 1 mm to 1.5 mm. The height of the flow channel 13 is in the range of 3.5 mm to 4 mm.

[0102] In this embodiment, the thickness of the upper and lower walls of the cooling plate body 1 ranges from 1mm to 1.5mm, and the height of the flow channel 13 ranges from 3.5mm to 4mm. The structure is more lightweight and ensures sufficient mechanical properties, thereby reducing the use of metal materials such as aluminum alloy in the liquid cooling plate structure and the coolant required for refrigeration, effectively reducing production costs.

[0103] like Fig. 9 As shown, the present application also provides a battery pack, comprising:

[0104] Fixed frame;

[0105] Battery box;

[0106] The liquid cooling plate structure as described above, wherein the battery box is fixed on the installation space of the liquid cooling plate structure;

[0107] A fixing portion is provided at the bottom of the cooling plate body 1 , and the battery box is mounted on the fixing frame through the fixing portion.

[0108] In the battery pack of the present application, the battery box is fixed on the installation space of the liquid cooling plate structure, so that the installation points of the liquid cooling plate structure and the battery box do not occupy the internal space of the battery box, thereby providing more storage space for the battery modules. The increased module storage space allows more battery modules to be installed in the battery box of the same volume, directly increasing the overall capacity of the battery pack. Furthermore, by setting the installation point of the battery box at the bottom of the cooling plate body 1, the installation space for installing the battery box in the liquid cooling plate structure can also be increased, so that a larger battery box can be accommodated in the installation space, further increasing the overall capacity of the battery pack and improving the cruising range of the electric vehicle. In addition, since the point where the coolant is easily leaked in the liquid cooling plate structure is located outside the battery box, the influence of the coolant leakage on the battery box is avoided, and the failure of the battery module in the battery box caused by the coolant leakage is reduced.

[0109] Furthermore, when coolant leaks, since the leak point is located outside the battery box, maintenance personnel can more easily locate and repair the problem without disassembling the battery box or interfering with the normal operation of the battery module, simplifying the maintenance process, reducing maintenance costs, and reducing battery module downtime caused by maintenance.

[0110] In this embodiment, if Fig. 9 As shown, the fixing portion includes a plurality of fixing holes 14, and the fixing holes 14 are respectively arranged at intervals at the bottom of the first waterway plate 11 and the bottom of the second waterway plate 12. In this way, the installation points of the liquid cooling plate structure and the battery box do not occupy the internal space of the battery box, thereby increasing the available space of the battery module; further, the space at the bottom of the first waterway plate 11 and the second waterway plate 12 is used to set the installation points of the battery box, thereby increasing the installation space in the cooling plate body 1 for installing the battery box, so that a larger battery box can be accommodated in the installation space, thereby increasing the power of the battery box, helping to improve the overall performance and safety of the battery system, which is of great significance for application fields such as electric vehicles that require high energy density and long driving range.

[0111] In this embodiment, a plurality of battery modules are installed in the battery box. Since the battery box is fixed on the installation space of the liquid cooling plate, the liquid cooling plate does not need to be encapsulated in the battery box, the internal space layout of the battery box is optimized, the storage space of the battery module is increased, and more battery modules can be installed in the battery box of the same volume by adjusting the size of the battery cell and the space matching of the battery module, thereby directly increasing the overall capacity of the battery to 50kW·h.

[0112] It is worth noting that the present application provides a liquid cooling plate structure and a battery pack, wherein the water inlet 2 and the water outlet 3 are both arranged outside the installation space for installing the battery box. Even if the coolant leaks, since the leaking point is located outside the battery box, the coolant will not directly contact the battery cell, thereby avoiding safety hazards such as short circuit and corrosion, greatly reducing the failure of the battery module in the battery box caused by the leakage of the coolant, and ensuring the stable operation of the battery module. In addition, the battery box is fixed on the installation space of the liquid cooling plate structure, so that the installation points of the liquid cooling plate structure and the battery box do not occupy the internal space of the battery box, thereby providing more storage space for the battery module. The increased module storage space allows more battery modules to be installed in the battery box of the same volume, directly increasing the overall capacity of the battery pack. Furthermore, by setting the installation point of the battery box at the bottom of the cooling plate body 1, the installation space for installing the battery box in the liquid cooling plate structure can also be increased, so that a larger size of battery box can be accommodated in the installation space, further increasing the overall capacity of the battery pack and improving the cruising range of the electric vehicle.

[0113] In the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with basically the same functions and effects. For example, the first waterway plate and the second waterway plate are only used to distinguish different waterway plates, and do not limit their order. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit them to be different.

[0114] It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" represent examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0115] In the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can represent: a, b, c, ab, ac, bc or abc, where a, b, c can be single or multiple.

[0116] The terms "component", "module", "system", etc. used in this specification are used to represent computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program and / or a computer. By way of illustration, both applications running on a computing device and a computing device can be components. One or more components may reside in a process and / or an execution thread, and a component may be located on a computer and / or distributed between two or more computers. In addition, these components may be executed from various computer-readable media having various data structures stored thereon. Components may, for example, communicate through local and / or remote processes according to signals having one or more data packets (e.g., data from two components interacting with another component between a local system, a distributed system and / or a network, such as the Internet interacting with other systems through signals).

[0117] Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0118] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0119] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0120] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0121] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0122] In the above embodiments, the functions of each functional unit can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). When loading and executing computer program instructions (programs) on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. Computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that contains one or more available media integrations. Available media may be magnetic media (e.g., floppy disks, hard disks, tapes), optical media (e.g., high-density digital video discs (DVDs), or semiconductor media (e.g., solid state disks (SSDs), etc.).

[0123] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

[0124] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0125] In summary, the present application provides a liquid cooling plate welding process control method, a liquid cooling plate structure and a battery pack, which can accurately identify the welding position by receiving the position information sent by the monitoring equipment, and write the laser wire welding moving path, so as to realize the precise welding of the complex structure of the liquid cooling plate, improve the welding accuracy and efficiency, have a high degree of automation, a small welding area, and the weld will not have pores and other influencing factors. At the same time, the manufacturing process is fast, time is saved, the production cycle is shortened, and the production efficiency is improved. It not only overcomes the limitations of traditional welding methods in dealing with large gaps, but also greatly improves the speed and quality of welding. The liquid cooling plate structure and the battery pack, the water inlet 2 and the water outlet 3 are both arranged outside the installation space for installing the battery box. Even if the coolant leaks, since the leakage point is located outside the battery box, the coolant will not directly contact the battery cell, thereby avoiding safety hazards such as short circuit and corrosion, greatly reducing the failure of the battery module in the battery box caused by the leakage of the coolant, and ensuring the stable operation of the battery module. And the battery box is fixed on the installation space of the liquid cooling plate structure, so that the installation points of the liquid cooling plate structure and the battery box do not occupy the internal space of the battery box, thereby providing more storage space for the battery modules. The increased module storage space allows more battery modules to be installed in the battery box of the same volume, directly increasing the overall capacity of the battery pack. Furthermore, by setting the installation point of the battery box at the bottom of the cooling plate body 1, the installation space for installing the battery box in the liquid cooling plate structure can also be increased, so that a larger battery box can be accommodated in the installation space, further increasing the overall capacity of the battery pack and improving the cruising range of the electric vehicle. Therefore, the present application effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0126] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A liquid cooling plate welding process control method, characterized in that: Applied to computer equipment, the computer equipment is respectively connected to the laser welding equipment and the monitoring equipment for communication, and the liquid cooling plate welding process control method includes: Receiving position information sent by a monitoring device for monitoring the position of the liquid cooling plate, and identifying a plurality of welding positions according to the position information; According to the plurality of welding positions, programming a laser wire-filling welding moving path; A start instruction is issued to the laser welding equipment, so that the laser welding equipment sequentially welds the components on the liquid cooling plate according to the laser wire welding moving path to form a liquid cooling plate structure.

2. The liquid cooling plate welding process control method according to claim 1, characterized in that: The computer device is also communicatively connected to the wire filling device and the thermal imaging device; a start instruction is issued to the laser welding device, so that the laser welding device sequentially welds the components on the liquid cooling plate according to the laser wire filling welding moving path to form the liquid cooling plate structure. The method includes: Sending a start instruction to the laser welding device, and according to a preset wire feeding speed, a preset wire feeding amount, and a laser wire-filling welding moving path, instructing the wire-filling device to perform a wire-filling operation on a welding area corresponding to a current welding position, and instructing the laser welding device to perform a welding operation on the current welding position of the liquid cooling plate; The thermal imaging device is instructed to collect a thermal image of the welding area corresponding to the current welding position, and according to the collected thermal image, the welding parameters of the laser welding device are adjusted to complete the welding of the current welding position; Repeat the above-mentioned wire filling operation and welding operation to complete the welding of each welding position to form a liquid cooling plate structure.

3. The liquid cooling plate welding process control method according to claim 1, characterized in that: The computer device is also communicatively connected to the welding positioning tool, and the monitoring device is arranged on the welding positioning tool; wherein the method of receiving the position information sent by the monitoring device for monitoring the position of the liquid cooling plate and identifying a plurality of welding positions according to the position information includes: When it is detected that the liquid cooling plate is located on the welding positioning fixture, the monitoring device is instructed to collect the position information of the liquid cooling plate on the welding positioning fixture and send it to the computer device; According to the received position information, identifying the coordinate information of each component on the liquid cooling plate; According to the preset welding rules and the coordinate information of each component on the liquid cooling plate, several welding positions are identified.

4. A liquid cooling plate structure, characterized in that: It is manufactured according to the liquid cooling plate welding process control method according to any one of claims 1 to 3; the liquid cooling plate structure is used for heat exchange of the battery box; The liquid cooling plate structure includes: a cooling plate body, a water inlet and a water outlet; wherein, the cooling plate body is provided with an installation space for installing the battery box; the water inlet and the water outlet are both arranged at one end of the cooling plate body along its length direction, and are both located outside the installation space; a flow water channel for the circulation of coolant is provided in the cooling plate body; the water inlet and the water outlet are respectively connected to the flow water channel; the coolant enters the flow water channel from the water inlet and exchanges heat with the battery box, and then flows out from the water outlet.

5. The liquid cooling plate structure according to claim 4, characterized in that: It also includes a plug, which is arranged outside the installation space.

6. The liquid cooling plate structure according to claim 4, characterized in that: It also includes a first limiting bracket and a second limiting bracket, wherein the first limiting bracket is fixed to one end of the cooling plate body along its length direction, and the second limiting bracket is fixed to the other end of the cooling plate body along its length direction.

7. The liquid cooling plate structure according to claim 6, characterized in that: It also includes a first protective plate and a second protective plate, the first protective plate is fixed to one end of the cooling plate body along its width direction, and the second protective plate is fixed to the other end of the cooling plate body along its width direction; the first limiting bracket, the second limiting bracket, the first protective plate and the second protective plate together form the installation space.

8. The liquid cooling plate structure according to claim 4, characterized in that: The cooling plate body includes a first waterway plate and a second waterway plate connected to the first waterway plate; the flow waterway is respectively arranged in the first waterway plate and the second waterway plate; the water inlet is arranged at one end of the first waterway plate along its length direction, and the water outlet is arranged at one end of the second waterway plate along its length direction.

9. The liquid cooling plate structure according to claim 4, characterized in that: The thickness of the upper and lower walls of the cooling plate body ranges from 1 mm to 1.5 mm, and the height of the flow channel ranges from 3.5 mm to 4 mm.

10. A battery pack, characterized in that: include: Fixed frame; Battery box; The liquid cooling plate structure according to any one of claims 4 to 9, wherein the battery box is fixed to the installation space of the liquid cooling plate structure; A fixing portion is provided at the bottom of the cooling plate body, and the battery box is mounted on the fixing frame through the fixing portion.

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