Battery constant temperature charging device and control method thereof

Abstract

The application provides a battery constant-temperature charging device and a control method thereof, and belongs to the technical field of battery charging. The device comprises a cast-weld cooling water circulation system, a phase-change heat storage pool, a constant-temperature pool, a heat supply circulation loop, a flow regulating valve and a controller. The water outlet end of the cast-weld cooling water circulation system is communicated with a heat exchange coil in the phase-change heat storage pool, the phase-change heat storage pool is filled with phase-change heat storage material, and is used for storing the waste heat of the cast-weld cooling water. The constant-temperature pool is used for accommodating the battery to be charged. The heat supply circulation loop is connected between the phase-change heat storage pool and the constant-temperature pool. The controller controls the opening degree of the flow regulating valve according to the temperature of the constant-temperature pool, so as to adjust the heat entering the constant-temperature pool. The battery constant-temperature charging device and the control method thereof provided by the application convert the intermittent cast-weld waste heat into a continuous heat source to supply the constant-temperature pool, realize the stable utilization of the waste heat and the accurate control of the constant-temperature charging, and have a remarkable energy-saving effect.

Description

Technical Field

[0001] This invention belongs to the field of battery charging technology, and more specifically, relates to a constant temperature charging device for batteries and its control method. Background Technology

[0002] During the charging process, temperature has a significant impact on the charging efficiency, lifespan, and safety of batteries. When the temperature is too low, the battery's ability to accept charge decreases, reducing charging efficiency and potentially leading to incomplete charging. When the temperature is too high, thermal runaway may occur, causing the battery to swell, leak, or even explode. Therefore, charging batteries in a constant-temperature environment is of great importance.

[0003] Existing constant-temperature charging devices for batteries mainly include electric heating, thermoelectric, and water bath types, all of which require additional electrical energy. On the other hand, the casting and welding process in battery production lines requires cooling the casting and welding molds. In existing technologies, the cooling water absorbed by the casting and welding process is usually directly discharged or recycled after cooling, resulting in a significant waste of thermal energy. Some technologies have attempted to utilize the waste heat of the casting and welding cooling water, for example, by introducing the heat from the casting and welding machine's cooling water into drying equipment for heating. However, these solutions all directly introduce waste heat into the heat-using equipment, failing to consider the time mismatch between the intermittent heat generation of the casting and welding process and the continuous heat use of the equipment. The casting and welding process is intermittent; the cooling water temperature is higher during the casting and welding period and drops rapidly during the intermittent periods, causing significant temperature fluctuations in the heat-using equipment, which cannot meet the stringent temperature stability requirements of constant-temperature charging. Summary of the Invention

[0004] The purpose of this invention is to provide a constant temperature charging device for a storage battery and its control method, which aims to solve the technical problem of heat supply mismatch between the intermittent heat generation in the casting and welding process and the continuous heat use in the constant temperature charging process in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a constant temperature charging device for a storage battery, comprising: The casting and welding cooling water circulation system is installed at the casting and welding station of the battery production line to cool the casting and welding molds. A phase change thermal storage tank is filled with phase change thermal storage material. The phase change thermal storage tank is equipped with a heat exchange coil, which is connected to the outlet of the casting and welding cooling water circulation system to enable heat exchange between the casting and welding cooling water and the phase change thermal storage material. A constant temperature bath is used to hold the batteries to be charged. The constant temperature bath is equipped with a charging interface and a temperature sensor. A heating circulation loop is connected between the phase change thermal storage tank and the constant temperature tank to transfer the heat stored in the phase change thermal storage material to the constant temperature tank. A flow regulating valve is installed on the heating circulation loop; The controller, electrically connected to the temperature sensor and the flow regulating valve, is used to control the opening degree of the flow regulating valve according to the temperature of the constant temperature pool detected by the temperature sensor.

[0006] One possible implementation also includes: The first temperature sensor is located at the outlet of the casting and welding cooling water circulation system and is electrically connected to the controller. A flow sensor is installed on the casting and welding cooling water circulation system and is electrically connected to the controller; The controller acquires casting and welding production plan information, predicts recoverable heat based on the first temperature sensor, the flow sensor, and the casting and welding production plan information, and controls the heat storage strategy of the phase change thermal storage tank.

[0007] In one possible implementation, a second temperature sensor is installed inside the phase change thermal storage tank. The second temperature sensor is electrically connected to the controller and is used to detect the temperature state of the phase change thermal storage material. The controller determines the available heat storage capacity of the phase change thermal storage tank based on the signal from the second temperature sensor.

[0008] In one possible implementation, there are multiple temperature sensors in the constant temperature pool, distributed in different areas of the constant temperature pool; the heating circulation loop has multiple parallel heating branches, each heating branch corresponding to a different area of ​​the constant temperature pool; the controller determines the temperature uniformity of the constant temperature pool based on the signals from the multiple temperature sensors, and adjusts the flow rate of each heating branch accordingly.

[0009] One possible implementation also includes: An auxiliary heating device is installed inside the phase change thermal storage tank or on the heating circulation loop. When the available heat storage capacity of the phase change thermal storage tank is lower than a preset threshold, the controller controls the auxiliary heating device to start.

[0010] One possible implementation also includes: The heat distribution pipeline is connected at one end to the phase change thermal storage tank and at the other end to an external heat-using unit. When the heat storage capacity of the phase change thermal storage tank exceeds a preset upper limit, the controller controls the excess heat to be transported to the external heat-using unit through the heat distribution pipeline.

[0011] In one possible implementation, the phase change temperature of the phase change thermal storage material is 35℃-55℃.

[0012] In one possible implementation, the controller employs a model predictive control algorithm, using the thermal storage state of the phase change thermal storage tank, the predicted heat generation of the casting and welding cooling water circulation system, and the heat demand of the constant temperature tank as input variables, and the opening degree of the flow regulating valve as the output variable, to optimize the temperature control of the constant temperature tank.

[0013] The beneficial effects of the constant temperature charging device for batteries provided by the present invention are as follows: Compared with the prior art, the waste heat of the casting and welding cooling water is recovered by the phase change heat storage tank and used for heating and heat preservation of the constant temperature tank. The constant temperature environment required for battery charging can be maintained without additional power consumption, which overcomes the defects of existing technologies such as electric heating and thermoelectric cooling that require additional power consumption and greatly reduces the energy consumption of constant temperature charging.

[0014] The casting and welding process is an intermittent operation, resulting in intermittent and unstable heat generation, while constant-temperature charging requires a continuous heat source. This invention incorporates a phase change thermal storage tank between the casting and welding cooling water circulation system and the constant-temperature tank. Utilizing the latent heat storage characteristics of phase change thermal storage materials, excess heat is stored during casting and welding and released to the constant-temperature tank during the intermittent periods. This achieves a "peak-shaving and valley-filling" heat buffer, transforming the intermittent and unstable waste heat from casting and welding into a continuous and stable heat source, fundamentally solving the heat supply mismatch problem between the casting and welding process and the constant-temperature charging process.

[0015] This invention uses a temperature sensor to detect the temperature of the constant temperature pool in real time. The controller precisely controls the opening of the flow regulating valve based on the detection signal, thereby achieving closed-loop precise control of the constant temperature pool temperature. This ensures that the temperature of the constant temperature pool remains stable within the optimal temperature range required for battery charging, effectively avoiding the decrease in charging efficiency and battery damage caused by temperature fluctuations, and improving charging quality.

[0016] The present invention also provides a method for constant temperature charging control of a storage battery, comprising the following steps: S1: Obtain casting and welding production plan information, and predict recoverable heat based on the casting and welding production plan information; S2: The cooling water used to cool the casting and welding mold in the casting and welding process is introduced into the phase change heat storage tank to exchange heat with the phase change heat storage material in the phase change heat storage tank and store the heat in the phase change heat storage material. S3: Obtain the actual temperature and flow rate information of the casting and welding cooling water, and correct the predicted value of the recoverable heat based on the actual temperature and flow rate information; S4: Monitor the temperature state of the phase change thermal storage material to determine the available heat storage capacity; S5: Monitor the temperature of the constant temperature pool to determine real-time heat demand; S6: Based on the predicted or corrected value of the recoverable heat, the available heat storage capacity, and the real-time heat demand, control the heat supply flow rate from the phase change thermal storage tank to the constant temperature tank, so that the temperature of the constant temperature tank is maintained within a preset range.

[0017] In one possible implementation, in step S6, when the recoverable heat is greater than the real-time heat demand, the excess heat is stored in the phase change thermal storage material; when the recoverable heat is less than the real-time heat demand, the heat stored in the phase change thermal storage material is released to supply the constant temperature pool.

[0018] The beneficial effects of the battery constant temperature charging control method provided by the present invention are the same as those of the battery constant temperature charging device described above, and will not be repeated here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a constant temperature charging device for a storage battery provided in an embodiment of the present invention (the structure represented by the rectangular frame at the right end of the heat diversion pipe is the external heat-using unit). Figure 2 This is a schematic diagram of the phase change thermal energy storage tank structure in this invention; Figure 3 This is a schematic diagram of the constant temperature pool structure in this invention; Figure 4 This is a block diagram of the control principle of the present invention (dashed lines represent closed-loop feedback).

[0021] Explanation of reference numerals in the attached figures: 1. Casting and welding cooling water circulation system; 11. Casting and welding mold; 12. Cooling water pipes; 13. First circulation pump; 14. Cooling channel; 2. Phase change thermal storage tank; 21. Phase change thermal storage material; 22. Heat exchange coil; 23. Inlet pipe; 24. Outlet pipe; 25. Insulation layer; 26. Second temperature sensor; 3. Constant temperature bath; 31. Storage battery; 32. Charging interface; 33. Temperature sensor; 34. Heating coil; 35. Positioning device; 4. Heating circulation loop; 41. Heating medium outlet pipe; 42. Heating medium return pipe; 43. Second circulation pump; 44. Heating branch; 45. Branch regulating valve 5. Flow regulating valve; 6. Controller; 7. First temperature sensor; 8. Flow sensor; 9. Auxiliary heating device; 10. Heat distribution piping; 101. Diversion valve. Detailed Implementation

[0022] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0024] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0027] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0028] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0029] Currently, temperature significantly impacts the charging efficiency and lifespan of batteries during charging. Existing constant-temperature charging devices for batteries mostly employ electric heating, requiring additional electrical energy. Furthermore, in the casting and welding process of battery production lines, cooling water, after absorbing heat from the casting and welding molds, is typically either directly discharged or recycled after cooling, resulting in wasted heat energy. Some technologies have attempted to directly introduce the waste heat from the casting and welding cooling water into the heat-using equipment, but these methods fail to consider the conflict between the intermittent heat generation of the casting and welding process and the continuous heat use of the equipment, leading to drastic temperature fluctuations in the heat-using equipment and failing to meet the requirements of constant-temperature charging.

[0030] In view of this, this embodiment provides a battery constant temperature charging device, which converts intermittent welding waste heat into a continuous heat source to supply the constant temperature tank by setting up a phase change heat storage tank, thereby realizing stable utilization of waste heat and precise control of constant temperature charging.

[0031] Please refer to the following: Figures 1 to 4 The present invention will now describe a constant temperature charging device for a storage battery. The constant temperature charging device for a storage battery includes a cast-welded cooling water circulation system 1, a phase change thermal storage tank 2, a constant temperature tank 3, a heating circulation loop 4, a flow regulating valve 5, and a controller 6.

[0032] A casting and welding cooling water circulation system 1 is installed at the casting and welding station of the battery production line to cool the casting and welding mold. The system includes a casting and welding mold 11, cooling water pipes 12, and a first circulation pump 13. The casting and welding mold 11 has a cooling channel 14, which is connected to the cooling water pipes 12. The first circulation pump 13 is installed on the cooling water pipes 12 and drives the cooling water to circulate between the cooling water pipes 12 and the cooling channel 14 of the casting and welding mold 11. After the casting and welding process is completed, the temperature of the casting and welding mold 11 is high. The first circulation pump 13 drives the cooling water into the cooling channel 14 of the casting and welding mold 11, where the cooling water exchanges heat with the mold, absorbing heat and increasing in temperature. The water then flows out from the outlet of the casting and welding cooling water circulation system 1, thus cooling the casting and welding mold 11.

[0033] The phase change thermal storage tank 2 is filled with phase change thermal storage material 21. A heat exchange coil 22 is installed within the phase change thermal storage tank 2, and the heat exchange coil 22 is connected to the outlet of the casting and welding cooling water circulation system 1 to facilitate heat exchange between the casting and welding cooling water and the phase change thermal storage material 21. The phase change thermal storage material 21 is a phase change material with thermal storage function, capable of absorbing or releasing a large amount of latent heat near the phase change temperature. The heat exchange coil 22 is immersed in the phase change thermal storage material 21. The water inlet of the heat exchange coil 22 is connected to the outlet of the casting and welding cooling water circulation system 1 via an inlet pipe 23, and the water outlet of the heat exchange coil 22 is connected to an outlet pipe 24. After the casting and welding cooling water flows out from the outlet of the casting and welding cooling water circulation system 1, it enters the heat exchange coil 22 through the inlet pipe 23. During the flow through the heat exchange coil 22, the casting and welding cooling water exchanges heat with the phase change thermal storage material 21 through the coil wall, transferring heat to the phase change thermal storage material 21. After absorbing heat, the phase change thermal storage material 21 undergoes a phase change (from solid to liquid), storing the heat in the form of latent heat. After heat exchange, the temperature of the casting and welding cooling water decreases, and it flows out through the outlet pipe 24, which can be recycled or discharged. The outer wall of the phase change thermal storage tank 2 is provided with an insulation layer 25 to reduce heat loss from the phase change thermal storage tank 2 and improve thermal storage efficiency.

[0034] The constant temperature bath 3 is used to hold the battery 31 to be charged. A charging interface 32 and a temperature sensor 33 are installed inside the constant temperature bath 3. The charging interface 32 is located on the inner wall of the constant temperature bath 3 and is used for electrical connection with the electrodes of the battery 31 to achieve charging of the battery 31. The constant temperature bath 3 also contains a heating coil 34 and a positioning device 35. The positioning device 35 is existing technology and is used to fix the position of the battery 31 to ensure the stability of the battery 31 during the charging process. The temperature sensor 33 is located inside the constant temperature bath 3 and is used to detect the temperature inside the constant temperature bath 3.

[0035] A heating circulation loop 4 is connected between the phase change thermal storage tank 2 and the constant temperature tank 3, and is used to transfer the heat stored in the phase change thermal storage material 21 to the constant temperature tank 3. A heating medium (such as water or heat transfer oil) circulates within the heating circulation loop 4. The heating circulation loop 4 includes a heating medium outlet pipe 41 and a heating medium return pipe 42. One end of the heating medium outlet pipe 41 is connected to the heating outlet of the phase change thermal storage tank 2, and the other end is connected to the inlet of the heating coil 34 in the constant temperature tank 3. One end of the heating medium return pipe 42 is connected to the outlet of the heating coil 34 in the constant temperature tank 3, and the other end is connected to the heating return port of the phase change thermal storage tank 2. A second circulation pump 43 is installed on the heating circulation loop 4 to drive the heating medium to circulate within the heating circulation loop 4. After absorbing the heat released by the phase change thermal storage material 21 in the phase change thermal storage tank 2, the temperature of the heating medium rises. It then flows into the heating coil 34 in the constant temperature tank 3 through the heating medium outflow pipe 41. During the flow through the heating coil 34, the heating medium radiates heat into the constant temperature tank 3 through the coil wall, heating and keeping the battery 31 in the constant temperature tank 3 warm. After the temperature of the heating medium decreases, it returns to the phase change thermal storage tank 2 through the heating medium return pipe 42 to absorb heat again, and so on.

[0036] A flow regulating valve 5 is installed on the heating circulation loop 4 to regulate the flow rate of the heating medium in the heating circulation loop 4, thereby regulating the amount of heat entering the constant temperature pool 3. In this embodiment, the flow regulating valve 5 is installed on the heating medium outlet pipe 41, located between the phase change thermal storage pool 2 and the constant temperature pool 3.

[0037] The controller 6 is electrically connected to the temperature sensor 33 and the flow regulating valve 5, and is used to control the opening degree of the flow regulating valve 5 according to the temperature of the constant temperature pool 3 detected by the temperature sensor 33. The temperature sensor 33 detects the temperature inside the constant temperature pool 3 in real time and feeds back the detected temperature signal to the controller 6. The controller 6 controls the opening degree of the flow regulating valve 5 according to the temperature of the constant temperature pool 3 detected by the temperature sensor 33. The specific control logic is as follows: the controller 6 has a preset target temperature range for the constant temperature pool 3 (e.g., 20℃-35℃). When temperature sensor 33 detects that the temperature of the constant temperature pool 3 is lower than the target lower limit, controller 6 controls the opening of flow regulating valve 5 to increase the flow rate of the heating medium entering the heating coil 34 of the constant temperature pool 3, thereby increasing the heat supply and causing the temperature of the constant temperature pool 3 to rise. When temperature sensor 33 detects that the temperature of the constant temperature pool 3 is higher than the target upper limit, controller 6 controls the opening of flow regulating valve 5 to decrease the flow rate of the heating medium entering the heating coil 34 of the constant temperature pool 3, thereby reducing the heat supply and causing the temperature of the constant temperature pool 3 to drop. When temperature sensor 33 detects that the temperature of the constant temperature pool 3 is within the target temperature range, controller 6 maintains the current opening of flow regulating valve 5. Thus, controller 6 achieves closed-loop precise control of the temperature of the constant temperature pool 3 by adjusting the opening of flow regulating valve 5 in real time, ensuring that the temperature inside the constant temperature pool 3 remains stable within the optimal temperature range required for charging the battery 31.

[0038] The working principle of this embodiment is as follows: After the casting and welding process is completed, the temperature of the casting and welding mold 11 is high. The first circulation pump 13 drives the cooling water into the cooling channel 14 of the casting and welding mold 11. After absorbing the heat of the casting and welding mold 11, the temperature of the cooling water rises. It flows out through the outlet of the casting and welding cooling water circulation system 1 and enters the heat exchange coil 22 in the phase change heat storage tank 2 through the inlet pipe 23.

[0039] When the casting and welding cooling water flows through the heat exchange coil 22, it exchanges heat with the phase change thermal storage material 21 through the tube wall of the heat exchange coil 22, transferring heat to the phase change thermal storage material 21. After absorbing heat, the phase change thermal storage material 21 changes from a solid state to a liquid state, storing the heat in the form of latent heat. After heat exchange, the temperature of the casting and welding cooling water decreases, and it flows out through the outlet pipe 24.

[0040] The second circulation pump 43 drives the heating medium in the heating circulation loop 4 to circulate. The heating medium exchanges heat with the phase change heat storage material 21 in the phase change heat storage tank 2, and its temperature rises after absorbing the heat released by the phase change heat storage material 21. It then flows into the heating coil 34 in the constant temperature tank 3 through the heating medium outlet pipe 41.

[0041] When the heating medium flows through the heating coil 34, it radiates heat into the constant temperature pool 3 through the pipe wall of the heating coil 34, heating and keeping the battery 31 in the constant temperature pool 3 warm. After the temperature of the heating medium decreases, it returns to the phase change thermal storage pool 2 through the heating medium return pipe 42 to absorb heat again.

[0042] During the above process, temperature sensor 33 monitors the temperature inside the constant temperature pool 3 in real time and feeds back the monitoring signal to controller 6. Controller 6 adjusts the opening of flow regulating valve 5 in real time based on the feedback signal from temperature sensor 33 to control the amount of heat supplied to the constant temperature pool 3, ensuring that the temperature of the constant temperature pool 3 is always maintained within the preset target temperature range, thus achieving constant temperature charging.

[0043] When the casting and welding process is in a break and no new casting and welding cooling water enters the phase change heat storage tank 2, the phase change heat storage material 21 releases the latent heat stored in the previous period and continues to supply heat to the constant temperature tank 3 through the heat supply circulation loop 4, ensuring the continuous supply of heat to the constant temperature tank 3, thereby effectively solving the problem of heat supply mismatch between the intermittent heat generation of the casting and welding process and the continuous heat use of the constant temperature tank 3.

[0044] The present invention provides a battery constant temperature charging device, which, compared with the prior art, recovers the waste heat of the casting and welding cooling water through the phase change heat storage tank 2 and uses it for heating and heat preservation of the constant temperature tank 3. It can maintain the constant temperature environment required for charging the battery 31 without consuming additional electrical energy, overcomes the defects of existing technologies such as electric heating and thermoelectric cooling that require additional electrical energy consumption, and greatly reduces the energy consumption of constant temperature charging.

[0045] The casting and welding process is an intermittent operation, and the heat generation is intermittent and unstable, while constant-temperature charging requires a continuous heat source. This invention sets up a phase change thermal storage tank 2 between the casting and welding cooling water circulation system 1 and the constant-temperature tank 3. Utilizing the latent heat storage characteristics of the phase change thermal storage material 21, excess heat is stored during casting and welding heat generation, and released to supply the constant-temperature tank 3 during the intermittent casting and welding intervals. This achieves a "peak-shaving and valley-filling" heat buffer, transforming the intermittent and unstable waste heat from casting and welding into a continuous and stable heat source supply, fundamentally solving the problem of heat supply mismatch between the casting and welding process and the constant-temperature charging process.

[0046] This invention uses a temperature sensor 33 to detect the temperature of the constant temperature pool 3 in real time, and the controller 6 precisely controls the opening of the flow regulating valve 5 according to the detection signal, so as to realize closed-loop precise control of the temperature of the constant temperature pool 3, ensuring that the temperature of the constant temperature pool 3 is stable within the optimal temperature range required for charging the battery 31, effectively avoiding the decrease in charging efficiency and battery damage caused by temperature fluctuations, and improving the charging quality.

[0047] In some embodiments, please refer to Figure 1The battery constant temperature charging device also includes a first temperature sensor 7 and a flow sensor 8. The first temperature sensor 7 is located at the outlet of the casting and welding cooling water circulation system 1 and is electrically connected to the controller 6, used to detect the cooling water temperature at the outlet of the casting and welding cooling water circulation system 1. The flow sensor 8 is located on the casting and welding cooling water circulation system 1 and is electrically connected to the controller 6, used to detect the flow rate of the cooling water in the casting and welding cooling water circulation system 1. The controller 6 acquires casting and welding production plan information, predicts recoverable heat based on the first temperature sensor 7, the flow sensor 8, and the casting and welding production plan information, and controls the heat storage strategy of the phase change thermal storage tank 2. The casting and welding production plan information includes the casting and welding cycle, casting and welding frequency, duration of each casting and welding operation, and interval time.

[0048] The controller 6 determines the future casting and welding operation time and duration based on the casting and welding production plan information; it calculates the recoverable heat per unit time based on the real-time detection of the outlet water temperature by the first temperature sensor 7 and the real-time detection of the flow rate by the flow sensor 8; combining the above information, the controller 6 uses a predictive algorithm (such as time series prediction or regression analysis, which is existing technology) to predict the total recoverable heat over a future period. Based on the predicted recoverable heat, the controller 6 controls the heat storage strategy of the phase change thermal storage tank 2.

[0049] For example, when the predicted recoverable heat is greater than the heat demand of the constant temperature pool 3, the controller 6 controls to increase the flow rate of the casting and welding cooling water into the phase change heat storage pool 2, so that the phase change heat storage material 21 can store heat fully; when the predicted recoverable heat is less than the heat demand of the constant temperature pool 3, the controller 6 prioritizes to control the phase change heat storage material 21 to release the stored heat to supply the constant temperature pool 3, and reduces the flow rate of the casting and welding cooling water into the phase change heat storage pool 2 to avoid excessive heat loss.

[0050] Through the above settings, this embodiment realizes intelligent prediction and scheduling of waste heat from casting and welding, thereby improving the utilization rate of waste heat and the operating efficiency of the system.

[0051] In some embodiments, please refer to Figures 1 to 2 A second temperature sensor 26 is installed inside the phase change thermal storage tank 2. The second temperature sensor 26 is electrically connected to the controller 6 and is used to detect the temperature state of the phase change thermal storage material 21. The controller 6 determines the available heat storage capacity of the phase change thermal storage tank 2 based on the signal from the second temperature sensor 26. Specifically, the second temperature sensor 26 is immersed in the phase change thermal storage material 21, detects the temperature of the phase change thermal storage material 21 in real time, and feeds back the detection signal to the controller 6. Based on the temperature signal fed back by the second temperature sensor 26 and the known phase change temperature range of the phase change thermal storage material 21, the controller 6 determines the current phase change stage (solid, solid-liquid mixture, or liquid) of the phase change thermal storage material 21 and its available heat storage capacity.

[0052] When the second temperature sensor 26 detects that the temperature of the phase change thermal storage material 21 is below the lower limit of the phase change temperature, it indicates that the phase change thermal storage material 21 is in a completely solid state and the available heat storage capacity is zero or extremely low. When the temperature is within the phase change temperature range, it indicates that the phase change thermal storage material 21 is in a solid-liquid mixed state and is absorbing or releasing latent heat, and the available heat storage capacity is part of the capacity. When the temperature is above the upper limit of the phase change temperature, it indicates that the phase change thermal storage material 21 has completely transformed into a liquid state and the available heat storage capacity has reached its maximum capacity.

[0053] The controller 6 optimizes the heating strategy based on the available heat storage capacity. For example, when the available heat storage capacity is sufficient, the controller 6 increases the heat supply flow rate of the heating circulation loop 4 to provide more heat to the constant temperature pool 3; when the available heat storage capacity is insufficient, the controller 6 reduces the heat supply flow rate and starts the auxiliary heating device to supplement the heat as needed.

[0054] Through the above settings, this embodiment realizes real-time monitoring and quantitative judgment of the thermal storage state of the phase change thermal storage tank 2, providing accurate input parameters for the decision-making of the controller 6, and further improving the control accuracy and system reliability.

[0055] In some embodiments, please refer to Figure 1 and Figure 3 The constant temperature pool 3 contains multiple temperature sensors 33 distributed in different areas of the constant temperature pool 3. The heating circulation loop 4 has multiple parallel heating branches 44, each corresponding to a different area of ​​the constant temperature pool 3, and each heating branch 44 is equipped with a branch regulating valve 45. The controller 6 determines the temperature uniformity of the constant temperature pool 3 based on the signals from the multiple temperature sensors 33 and adjusts the flow rate of each heating branch 44 accordingly. The controller 6 compares the temperature values ​​of different areas of the constant temperature pool 3 and calculates the temperature difference between the areas. When temperature stratification or excessive local temperature difference is detected within the constant temperature pool 3, the controller 6 adjusts the opening of the branch regulating valve 45 on each heating branch 44, increasing the flow rate of the heating medium in the heating branch 44 corresponding to the lower temperature area and / or decreasing the flow rate of the heating medium in the heating branch 44 corresponding to the higher temperature area, so that the temperature of each area of ​​the constant temperature pool 3 tends to be uniform.

[0056] For example, when the temperature detected by the temperature sensor 33 at the bottom of the constant temperature pool 3 is lower than the temperature detected by the temperature sensor 33 at the top, the controller 6 controls the branch regulating valve 45 of the heating branch 44 near the bottom area to increase the opening degree, thereby increasing the heat supply in the bottom area. At the same time, the controller controls the branch regulating valve 45 of the heating branch 44 near the top area to decrease the opening degree, thereby reducing the heat supply in the top area, so that the temperature in the constant temperature pool 33 is evenly distributed.

[0057] Through the above settings, this embodiment effectively avoids the temperature stratification phenomenon caused by uneven heat distribution in the constant temperature pool 3, ensuring that each battery 31 in the constant temperature pool 3 is in a uniform temperature environment during the charging process, and further improving the charging consistency.

[0058] In some embodiments, please refer to Figure 1 The battery constant temperature charging device also includes an auxiliary heating device 9, which is installed inside the phase change thermal storage tank 2 or on the heating circulation loop 4. When the available heat storage capacity of the phase change thermal storage tank 2 is lower than a preset threshold, the controller 6 controls the auxiliary heating device 9 to start. In this embodiment, the auxiliary heating device 9 is an electric heating tube, which is electrically connected to the controller 6. When the casting and welding process is in a long-term intermittent period (such as during nighttime production stoppage or equipment maintenance), the heat stored in the phase change thermal storage material 21 is gradually released. The second temperature sensor 26 detects that the temperature of the phase change thermal storage material 21 has dropped below the lower limit of the phase change temperature. When the controller 6 determines that the available heat storage capacity is insufficient to maintain the heating demand of the constant temperature tank 3, the controller 6 controls the auxiliary heating device 9 to start, supplementing the heating of the phase change material in the phase change thermal storage tank 2 to ensure a continuous heat supply to the constant temperature tank 3.

[0059] When the available heat storage capacity of the phase change thermal storage tank 2 recovers to above the preset threshold, the controller 6 controls the auxiliary heating device 9 to stop working. Through the above settings, this embodiment ensures that the constant temperature tank 3 can still work normally under special circumstances where the residual heat from casting and welding is insufficient, thereby improving the reliability and applicability of the system.

[0060] In some embodiments, please refer to Figure 1 The battery constant temperature charging device also includes a heat diversion pipeline 10, one end of which is connected to the phase change thermal storage tank 2 and the other end is connected to an external heat-using unit. When the heat storage capacity of the phase change thermal storage tank 2 exceeds a preset upper limit, the controller 6 controls the excess heat to be transported to the external heat-using unit through the heat diversion pipeline 10. A diversion valve 101 is provided on the heat diversion pipeline 10. The diversion valve 101 is electrically connected to the controller 6 and its operation is controlled by the controller 6.

[0061] When the heat storage capacity of the phase change thermal storage tank 2 exceeds the preset upper limit, that is, when the phase change thermal storage material 21 has stored enough heat, and the casting and welding cooling water continues to input heat into the phase change thermal storage tank 2, the controller 6 controls the diversion valve to open, and the excess heat is transported to the external heat-using unit through the heat diversion pipeline 10. The external heat-using unit can be a workshop heating system, a hot water supply system, or other equipment that requires heat energy.

[0062] When the heat storage capacity of the phase change thermal storage tank 2 drops below the preset upper limit, the controller 6 controls the diversion valve to close, stopping the diversion and delivery of heat. Through the above settings, this embodiment achieves diversified utilization of waste heat, avoids energy waste caused by excess heat, and further improves energy utilization efficiency.

[0063] In some embodiments, the phase change thermal storage material 21 has a phase change temperature of 35°C-55°C. The phase change thermal storage material 21 can be a paraffin-based phase change material (such as commercial models like RT42 and RT50), with a phase change temperature range of 40-50°C; or it can be an inorganic hydrated salt phase change material (such as calcium chloride hexahydrate, sodium sulfate decahydrate, etc.), with a phase change temperature range of 30-50°C.

[0064] The outlet temperature of the casting and welding cooling water is usually 45-60℃, and the phase change temperature of the phase change heat storage material 21 is set to 35-55℃. This ensures that the heat from the casting and welding cooling water is effectively transferred to the phase change heat storage material 21 and causes it to undergo phase change heat storage. At the same time, it ensures that the temperature at which the phase change heat storage material 21 releases heat meets the heating and insulation requirements of the constant temperature pool 3 (the target temperature of the constant temperature pool 3 is 20-35℃).

[0065] Through the above settings, this embodiment ensures that there is a sufficient heat transfer temperature difference between the casting and welding cooling water and the phase change thermal storage material 21, and at the same time, the phase change temperature of the phase change thermal storage material 21 matches the working temperature of the constant temperature pool 3, thus realizing efficient heat transfer and utilization.

[0066] In some embodiments, please refer to Figures 1 to 4 The controller 6 adopts a model predictive control algorithm, taking the heat storage state of the phase change thermal storage tank 2, the heat generation prediction of the casting and welding cooling water circulation system 1, and the heat demand of the constant temperature tank 3 as input variables, and the opening degree of the flow regulating valve 5 as the output variable, so as to optimize the temperature control of the constant temperature tank 3.

[0067] Specifically, in each control cycle, the controller 6, based on the current heat storage status of the phase change thermal storage tank 2 (including the temperature of the phase change thermal storage material 21, available heat storage, etc.), the heat generation prediction of the casting and welding cooling water circulation system 1 (based on the casting and welding production plan information, the detection signals of the first temperature sensor 7 and the flow sensor 8 to predict the recoverable heat in the future period), and the heat demand of the constant temperature tank 3 (based on the deviation between the current temperature of the constant temperature tank 3 and the target temperature detected by the temperature sensor 33), solves an optimization problem in a finite time domain through a model predictive control algorithm, obtains the optimal opening sequence of the flow regulating valve 5 in the future several control cycles, and outputs the first control quantity in the sequence to the flow regulating valve 5 for execution.

[0068] In each subsequent control cycle, controller 6 repeats the above process to achieve rolling optimization. Through the above settings, this embodiment achieves predictive and forward-looking control of the temperature of the constant temperature pool 3, further improving the temperature control accuracy and the dynamic response performance of the system.

[0069] The present invention also provides a constant temperature charging control method for a storage battery 31, comprising the following steps: S1: Obtain casting and welding production plan information, and predict recoverable heat based on the casting and welding production plan information; S2: The cooling water used to cool the casting and welding mold 11 in the casting and welding process is introduced into the phase change heat storage tank 2 to exchange heat with the phase change heat storage material 21 in the phase change heat storage tank 2 and store the heat in the phase change heat storage material 21. S3: Obtain the actual temperature and flow rate information of the casting and welding cooling water, and correct the predicted value of recoverable heat based on the actual temperature and flow rate information; S4: Monitor the temperature state of the phase change thermal storage material 21 to determine the available heat storage capacity; S5: Monitor the temperature of constant temperature pool 3 to determine real-time heat demand; S6: Based on the predicted or corrected value of recoverable heat, available heat storage capacity and real-time heat demand, control the heat supply flow rate from phase change thermal storage tank 2 to constant temperature tank 3, so that the temperature of constant temperature tank 3 is maintained within the preset range.

[0070] In some embodiments, in step S1 above, the controller 6 acquires casting and welding production plan information, which includes information such as casting and welding cycle, casting and welding frequency, duration of each casting and welding operation, and interval time. Based on the above information, the controller 6 determines the heat-generating and non-heat-generating periods of the casting and welding process in the future, and predicts the total recoverable heat in the future.

[0071] In some embodiments, in step S2 above, after the casting and welding process is completed, the first circulating pump 13 drives cooling water into the cooling channel 14 of the casting and welding mold 11. The cooling water absorbs heat from the casting and welding mold 11, its temperature rises, and it flows out through the outlet of the casting and welding cooling water circulation system 1, entering the heat exchange coil 22 in the phase change thermal storage tank 2 through the inlet pipe 23. As the casting and welding cooling water flows through the heat exchange coil 22, it exchanges heat with the phase change thermal storage material 21 through the pipe wall of the heat exchange coil 22, transferring heat to the phase change thermal storage material 21. After absorbing heat, the phase change thermal storage material 21 changes from a solid to a liquid state, storing the heat in the form of latent heat. The temperature of the casting and welding cooling water decreases after heat exchange and flows out through the outlet pipe 24.

[0072] In some embodiments, during step S3, as the welding cooling water enters the phase change thermal storage tank 2, the first temperature sensor 7 detects the outlet temperature of the welding cooling water in real time, and the flow sensor 8 detects the flow rate of the welding cooling water in real time. The controller 6 acquires the actual temperature and flow rate information and calculates the actual recoverable heat per unit time based on the actual temperature and flow rate per unit time. The controller 6 compares the actual recoverable heat with the recoverable heat predicted in step S1, and corrects the predicted value of the recoverable heat based on the comparison result to obtain the corrected predicted value of the recoverable heat.

[0073] For example, if the actual recoverable heat is consistently lower than the predicted value, the controller 6 adjusts the predicted value of the recoverable heat for subsequent periods accordingly; if the actual recoverable heat is consistently higher than the predicted value, the controller 6 adjusts the predicted value of the recoverable heat for subsequent periods accordingly. Through the above corrections, the predicted value of the recoverable heat is made closer to the actual value, improving the accuracy of subsequent control decisions.

[0074] In some embodiments, in step S4 above, the second temperature sensor 26 is immersed in the phase change thermal storage material 21 to detect the temperature of the phase change thermal storage material 21 in real time and feeds back the detection signal to the controller 6. The controller 6 determines the current phase change stage (solid, solid-liquid mixture, or liquid) of the phase change thermal storage material 21 and its available heat storage capacity based on the temperature signal fed back by the second temperature sensor 26 and the known phase change temperature range of the phase change thermal storage material 21.

[0075] In some embodiments, in step S5 above, the temperature sensor 33 detects the temperature inside the constant temperature pool 3 in real time and feeds back the detected temperature signal to the controller 6. The controller 6 determines the current real-time heat demand of the constant temperature pool 3 based on the difference between the current temperature fed back by the temperature sensor 33 and the preset target temperature. The larger the difference, the greater the heat demand; the smaller the difference, the smaller the heat demand.

[0076] In some embodiments, in step S6 above, the controller 6 integrates the predicted value of recoverable heat (or its correction value) obtained in step S3, the available heat storage capacity determined in step S4, and the real-time heat demand determined in step S5, and adjusts the heat supply flow from the phase change thermal storage tank 2 to the constant temperature tank 3 by making a control strategy decision and controlling the opening of the flow regulating valve 5, so that the temperature of the constant temperature tank 3 is maintained within a preset range (such as 20℃-35℃).

[0077] In some embodiments, in step S6 above, when the recoverable heat is greater than the real-time heat demand, the excess heat is stored in the phase change heat storage material 21; the controller 6 determines that the recoverable heat is sufficient, and under the premise of meeting the current heat demand of the constant temperature pool 3, controls to increase the flow rate of the casting and welding cooling water into the phase change heat storage pool 2, so that the phase change heat storage material 21 stores the excess heat in the form of latent heat.

[0078] When the recoverable heat is less than the real-time heat demand, the heat stored in the phase change thermal storage material 21 is released to supply the constant temperature pool 3. The controller 6 determines that the recoverable heat is insufficient to meet the heat demand of the constant temperature pool 3, and controls the priority release of the heat stored in the phase change thermal storage material 21 to supply the constant temperature pool 3. That is, it controls the increase of the flow rate of the heating medium in the heating circulation loop 4, so that the phase change thermal storage material 21 releases the stored latent heat, which is transferred to the heating coil 34 of the constant temperature pool 3 through the heating circulation loop 4 to supplement the insufficient heat.

[0079] Through the above method, the present invention realizes intelligent prediction, dynamic correction and precise scheduling of casting and welding waste heat, transforming intermittent and unstable casting and welding waste heat into a continuous, stable and reliable heat source to supply the constant temperature pool 3, so that the temperature of the constant temperature pool 3 is always maintained within the preset range, effectively improving the waste heat utilization rate and the temperature control accuracy of constant temperature charging.

[0080] Optionally, in some embodiments, the method further includes step S7: when the available heat storage capacity of the phase change thermal storage material 21 is lower than a preset threshold, the auxiliary heating device 9 is activated for supplementary heating. For the specific control logic, please refer to the above-described implementation of the auxiliary heating device 9, which will not be repeated here.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A constant-temperature charging device for a storage battery, characterized in that, include: The casting and welding cooling water circulation system is installed at the casting and welding station of the battery production line to cool the casting and welding molds. A phase change thermal storage tank is filled with phase change thermal storage material. The phase change thermal storage tank is equipped with a heat exchange coil, which is connected to the outlet of the casting and welding cooling water circulation system to enable heat exchange between the casting and welding cooling water and the phase change thermal storage material. A constant temperature bath is used to hold batteries to be charged. The constant temperature bath is equipped with a charging interface and a temperature sensor. A heating circulation loop is connected between the phase change thermal storage tank and the constant temperature tank to transfer the heat stored in the phase change thermal storage material to the constant temperature tank. A flow regulating valve is installed on the heating circulation loop; The controller, electrically connected to the temperature sensor and the flow regulating valve, is used to control the opening degree of the flow regulating valve according to the temperature of the constant temperature pool detected by the temperature sensor.

2. The battery constant temperature charging device as described in claim 1, characterized in that, Also includes: The first temperature sensor is located at the outlet of the casting and welding cooling water circulation system and is electrically connected to the controller. A flow sensor is installed on the casting and welding cooling water circulation system and is electrically connected to the controller; The controller acquires casting and welding production plan information, predicts recoverable heat based on the first temperature sensor, the flow sensor, and the casting and welding production plan information, and controls the heat storage strategy of the phase change thermal storage tank.

3. The battery constant temperature charging device as described in claim 1, characterized in that, A second temperature sensor is installed inside the phase change thermal storage tank. The second temperature sensor is electrically connected to the controller and is used to detect the temperature state of the phase change thermal storage material. The controller determines the available heat storage capacity of the phase change thermal storage tank based on the signal from the second temperature sensor.

4. A constant-temperature charging device for a storage battery as described in claim 1, characterized in that, The constant temperature pool contains multiple temperature sensors distributed in different areas of the constant temperature pool; the heating circulation loop has multiple parallel heating branches, each corresponding to a different area of ​​the constant temperature pool; the controller determines the temperature uniformity of the constant temperature pool based on the signals from the multiple temperature sensors and adjusts the flow rate of each heating branch accordingly.

5. A battery constant temperature charging device as described in claim 1, characterized in that, Also includes: An auxiliary heating device is installed inside the phase change thermal storage tank or on the heating circulation loop. When the available heat storage capacity of the phase change thermal storage tank is lower than a preset threshold, the controller controls the auxiliary heating device to start.

6. A battery constant temperature charging device as described in claim 1, characterized in that, Also includes: The heat distribution pipeline is connected at one end to the phase change thermal storage tank and at the other end to an external heat-using unit. When the heat storage capacity of the phase change thermal storage tank exceeds a preset upper limit, the controller controls the excess heat to be transported to the external heat-using unit through the heat distribution pipeline.

7. A battery constant temperature charging device as described in claim 1, characterized in that, The phase change temperature of the phase change thermal storage material is 35℃-55℃.

8. A battery constant temperature charging device as described in claim 1, characterized in that, The controller employs a model predictive control algorithm, using the heat storage state of the phase change thermal storage tank, the heat generation prediction of the casting and welding cooling water circulation system, and the heat demand of the constant temperature tank as input variables, and the opening degree of the flow regulating valve as the output variable, to optimize the temperature control of the constant temperature tank.

9. A method for controlling constant temperature charging of a storage battery, characterized in that, Includes the following steps: S1: Obtain casting and welding production plan information, and predict recoverable heat based on the casting and welding production plan information; S2: The cooling water used to cool the casting and welding mold in the casting and welding process is introduced into the phase change heat storage tank to exchange heat with the phase change heat storage material in the phase change heat storage tank and store the heat in the phase change heat storage material. S3: Obtain the actual temperature and flow rate information of the casting and welding cooling water, and correct the predicted value of the recoverable heat based on the actual temperature and flow rate information; S4: Monitor the temperature state of the phase change thermal storage material to determine the available heat storage capacity; S5: Monitor the temperature of the constant temperature pool to determine real-time heat demand; S6: Based on the predicted or corrected value of the recoverable heat, the available heat storage capacity, and the real-time heat demand, control the heat supply flow rate from the phase change thermal storage tank to the constant temperature tank, so that the temperature of the constant temperature tank is maintained within a preset range.

10. A battery constant temperature charging control method as described in claim 9, characterized in that, In step S6, when the recoverable heat is greater than the real-time heat demand, the excess heat is stored in the phase change thermal storage material; when the recoverable heat is less than the real-time heat demand, the heat stored in the phase change thermal storage material is released to supply the constant temperature pool.

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