Integrated charging and discharging device and logic control method

Abstract

This invention discloses an integrated charging and discharging device, including a device body and a water-cooling system. The device body includes a frame, a motion mechanism, and a power supply unit. The water-cooling system includes a heat exchanger and a water-cooling mechanism, with the heat exchanger disposed within a heat exchange chamber. The water-cooling mechanism is disposed outside the frame and contains a water supply device and a controller. The water supply device's inlet is connected to the cold water inlet of the heat exchanger via a first water supply pipe, an electrically controlled proportional valve, and a second water supply pipe. The return water inlet is connected to the hot water outlet of the heat exchanger via a return water pipe. The electrically controlled proportional valve and the water supply device are both electrically or signal-connected to the controller. This invention also includes a logic control method, comprising: within 0 to (t1+t... EOT1 (t1+t) EOT1 )~(t2+t EOT2 (t2+t) EOT2 )~(t3+t EOT3 (t3+t) EOT3 Within the time interval t1 to t4, the opening and closing of the electronically controlled proportional valve are controlled by control logics A1, A2, A3, and A4 respectively. The beneficial effects of this invention are: precise temperature control is achieved through segmented control logic, extending the service life of the electronically controlled proportional valve.

Description

Technical Field

[0001] This invention belongs to the technical field of lithium battery multi-channel formation and capacity testing equipment, and relates to an integrated charging and discharging device and logic control method. Background Technology

[0002] Integrated charging and discharging equipment integrates the charging and discharging mechanism with the power supply, and simultaneously performs temperature control. To meet industry requirements for precise battery temperature control in charging and discharging equipment, integrated charging and discharging equipment incorporates a water-cooling system for efficient and accurate heat exchange temperature control. Because the battery undergoes complex physical and chemical reactions at different stages of charging and discharging (constant current charging (CC), constant voltage charging (CV), constant current discharging (DC), and constant voltage discharging (DV), the power supply operates at different power levels during each stage, resulting in varying power consumption. Therefore, the heat generated inside the charging and discharging equipment is not constant but dynamically changing throughout the entire charging and discharging process. Currently, conventional integrated charging and discharging equipment water-cooling systems only control the system's on / off state using on / off electric valves, which cannot precisely adjust the on / off ratio or cooling capacity, thus failing to meet the corresponding technical specifications. Furthermore, when integrated charging and discharging equipment is integrated into a factory production line, conventional on / off electric valves are even less capable of meeting actual production needs. Because the switching electric valves are only available in normally open or normally closed types, if a normally open electric valve is selected, it needs to be closed for a long time when the internal temperature of the charging / discharging equipment is too low or the equipment is not performing a charging / discharging process. The prolonged engagement of the normally open electric valve will increase the probability of valve failure. Similarly, if a normally closed electric valve is selected, it needs to be open for a long time when the equipment is performing a charging / discharging process for a long time, increasing the cooling capacity of the water cooling system, which will also increase the probability of valve failure. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes an integrated charging and discharging device and logic control method that categorizes battery temperature values, allows for graded adjustment, enables precise temperature control, and reduces the probability of electronic control valve failure.

[0004] The integrated charging and discharging device of the present invention is characterized in that it includes a device body and a water cooling system;

[0005] The device body includes a frame, a motion mechanism, and a power supply unit. The inner cavity of the frame is divided into a charging / discharging chamber and a heat exchange chamber by a vertical partition. An upper air duct fan is provided at the top of the vertical partition, and a lower air duct fan is provided at the bottom. The motion mechanism is located inside the charging / discharging chamber and has a lifting platform that lifts the tray vertically. Several tray fans are provided at the bottom of the lifting platform. The lifting platform divides the charging / discharging chamber into an upper air duct and a lower air duct arranged vertically. The power supply unit is located at the top of the frame and has several probes, which are directly opposite the lifting platform.

[0006] The water-cooling system includes a heat exchanger and a water-cooling mechanism. The heat exchanger is located inside the heat exchange chamber and has a cold water inlet and a hot water outlet. The water-cooling mechanism is located outside the mechanism frame and contains a water supply device and a controller. The water supply device's water inlet is connected to the cold water inlet of the heat exchanger via a first water supply pipe and a second water supply pipe, which are connected via an electrically controlled proportional valve. The water supply device's return outlet is connected to the hot water outlet of the heat exchanger via a return pipe. The electrically controlled proportional valve and the water supply device are both electrically or signal-connected to the controller.

[0007] Preferably, the end face of the vertical partition facing the charging / discharging cavity is the first face, and the end face facing the heat exchange cavity is the second face. The upper part of the first face is provided with an upper air duct fan, and the lower part is provided with a lower air duct fan. The air inlet of the upper air duct fan is located on the charging / discharging cavity side, and the air outlet is located on the heat exchange cavity side, for transporting hot air in the upper air duct to the upper part of the heat exchange cavity. The air inlet of the lower air duct fan is located on the heat exchange cavity side, and the air outlet is located on the charging / discharging cavity side, for transporting cold air from the lower part of the heat exchange cavity to the lower air duct.

[0008] In an integrated charging and discharging device, during the charging and discharging process, the upper surface of the battery tray and the lower surface of the power supply unit in the moving mechanism press against each other. When the charging and discharging process begins, contact resistance heat Q1 is generated at this contact point due to contact resistance. The battery itself generates heat Q2 at the corresponding moment, and the power supply unit generates heat Q3 at the same moment. Therefore, the total heat inside the device is Q. 总 =Q1+Q2+Q3.

[0009] The temperature control principle of the integrated charging and discharging equipment is as follows: During the normal charging and discharging process, the battery and power supply unit in the tray inside the moving mechanism are pressed together, generating a Q inside the equipment. 总 Heat is generated and forms hot air, which is drawn into the heat exchange chamber on the side of the frame by a fan in the upper air duct of the moving mechanism. Here, the hot air exchanges heat with the heat exchanger and becomes cold air, which is then blown into the moving mechanism by a fan in the lower air duct. After entering the moving mechanism, the cold air is drawn in by a tray fan, flows over the battery surface, and passes through the power supply section to become hot air, thus completing the hot and cold air circulation inside the integrated charging and discharging device. The cold water inlet and hot water outlet of the heat exchanger are connected to the second water supply pipe and the return water pipe, respectively. The second water supply pipe is connected in sequence to the electronically controlled proportional valve, the first water supply pipe, and then to the external water cooling mechanism. After the heat exchanger exchanges heat with the integrated charging and discharging equipment at the air end, the cooling water in the heat exchanger's internal pipes becomes hot water. The hot water enters the external water-cooling mechanism through the return water pipe. After heat exchange in the water-cooling mechanism, the hot water becomes cold water. The cold water flows into the heat exchanger's internal pipes through the first water supply pipe, the electronically controlled proportional valve, and the second water supply pipe in sequence, and undergoes heat exchange to become hot water again. This completes the hot and cold water circulation outside the integrated charging and discharging equipment.

[0010] Currently, the industry generally divides battery charging and discharging into four stages: constant current charging stage (CC stage, in which the battery current remains constant and the battery voltage increases), constant voltage charging stage (CV stage, in which the battery voltage remains constant and the battery current decreases), constant current discharging stage (DC stage, in which the battery current remains constant and the battery voltage decreases), and constant voltage discharging stage (DV stage, in which the battery voltage remains constant and the battery current decreases).

[0011] The integrated charging and discharging equipment generates heat at different stages (the heat can be simplified to Q=I). 2 *R) is inconsistent. During the constant current charging stage, the current remains constant at a certain set value (e.g., I=200A), and the impedance R generally changes very little during the charging and discharging stages. Therefore, the heat generated Q during the constant current charging stage is... CC Relatively stable; upon entering the constant voltage charging stage, the current rapidly decreases from the set value, resulting in heat generation Q during the constant voltage stage. CV It will drop rapidly, and Q will decrease throughout the constant voltage charging phase. CV It will continue to decline dynamically, while Q CV <Q CC When the constant current discharge stage begins, the current instantly returns to the set value (e.g., I=200A) and remains constant. The heat generated at this time is Q. DC Relatively stable, and Q CV <Q CC =Q DC When the constant voltage discharge stage begins, the current decreases rapidly from the set value again, and the heat generated during the constant voltage stage is Q. DV It will drop rapidly, and Q DV It will continue to decline dynamically, while Q DV <Q CC =Q DC .

[0012] Given the dynamic nature of heat generation within the integrated charging and discharging equipment as the charging and discharging process progresses, the cooling capacity of the water cooling system needs to be dynamically adjusted accordingly. An electronically controlled proportional valve is employed to control the opening and closing ratio of the water cooling system, thereby further controlling its cooling capacity. Furthermore, because the heat generation differs significantly between the constant current charging and discharging stages (CC stage, DC stage) and the constant voltage charging and discharging stages (CV stage, DV stage), independent logic is used to control these corresponding stages.

[0013] The logic control method described in this invention is applied to an integrated charging and discharging device. The control method includes the following steps:

[0014] Step 1, in the range of 0 to (t1+t) EOT1 Within a given time period, the opening and closing of the electronically controlled proportional valve is manipulated using A1 control logic. t1 represents the duration of the constant current charging phase. EOT1Delay time for A1 control logic:

[0015] S11 When the average temperature of all batteries in the tray is T AVG When the temperature is less than T-1℃, the opening and closing ratio of the electronically controlled proportional valve is 0%, meaning the proportional valve is fully closed at this time; T is the target temperature value.

[0016] S12 When the average temperature of all batteries in the tray is T AVG At temperatures greater than T+1℃, the proportional valve outputs a 100% opening / closing ratio, meaning the proportional valve is fully open at this time; T is the target temperature value.

[0017] S13 When the average temperature of all batteries in the tray is T AVG When the temperature is between (T-1℃ and T+1℃), the opening ratio of the electronically controlled proportional valve is S1 (e.g., 70% opening, the value of S1 is related to the specific equipment and environment), that is, the proportional valve is in a partially open state at this time.

[0018] Step 2, in (t1+t) EOT1 )~(t2+t EOT2 Within a given time period, the opening and closing of the electronically controlled proportional valve is manipulated using the A2 control logic. t2 represents the duration of the constant voltage charging phase. EOT2 Delay time for A2 control logic:

[0019] S21 When the average temperature of all batteries in the tray is T AVG When the temperature is less than T-1℃, the opening and closing ratio of the electronically controlled proportional valve is 0%, meaning the proportional valve is fully closed at this time; T is the target temperature value.

[0020] S22 When the average temperature of all batteries in the tray is T AVG At temperatures greater than T+1℃, the proportional valve outputs a 100% opening / closing ratio, meaning the proportional valve is fully open at this time; T is the target temperature value.

[0021] S23 When the average temperature of all batteries in the tray is T AVG When the temperature is between (T-1℃ and T+1℃), the opening ratio of the electronically controlled proportional valve is S2, where S2 < S1 (e.g., if it is open by 20%, because Q...). CV Much smaller than Q CC Therefore, the proportional valve opens to a smaller ratio at this time, meaning the proportional valve is in a partially open state; T is the target temperature value.

[0022] Step 3, in (t2+t) EOT2 )~(t3+t EOT3 Within a given time period, the A3 control logic is used to control the opening and closing of the electronically controlled proportional valve. t3 represents the duration of the constant current discharge phase. EOT3 Delay time for A3 control logic:

[0023] S31 When the average temperature of all batteries in the tray is T AVG When the temperature is less than T-1℃, the opening and closing ratio of the electronically controlled proportional valve is 0%, meaning the proportional valve is fully closed at this time; T is the target temperature value.

[0024] S32 When the average temperature of all batteries in the tray is T AVG At temperatures greater than T+1℃, the proportional valve outputs a 100% opening / closing ratio, meaning the proportional valve is fully open at this time; T is the target temperature value.

[0025] S33 When the average temperature of all batteries in the tray is T AVG When the temperature is between (T-1℃ and T+1℃), the opening ratio of the electronically controlled proportional valve is S3, which is close to S1 (e.g., 60% opening, mainly depending on the battery characteristics, the heat generated during the constant current discharge stage of some batteries will be slightly lower than that during the constant current charging stage), that is, the proportional valve is in a partially open state at this time; T is the target temperature value.

[0026] Step 4, in (t3+t) EOT3 During the time interval t4, the opening and closing of the electronically controlled proportional valve is controlled by the A4 control logic, where t4 is the duration of the constant current discharge phase.

[0027] S41 When the average temperature of all batteries in the tray is T AVG When the temperature is less than T-1℃, the opening and closing ratio of the electronically controlled proportional valve is 0%, meaning the proportional valve is fully closed at this time; T is the target temperature value.

[0028] S42 When the average temperature T of all batteries in the tray is... AVG At temperatures greater than T+1℃, the proportional valve outputs a 100% opening / closing ratio, meaning the proportional valve is fully open at this time; T is the target temperature value.

[0029] S43 When the average temperature of all batteries in the tray is T AVG When the temperature is between (T-1℃ and T+1℃), the opening ratio of the electronically controlled proportional valve is S4. S4 is close to S2, meaning that the proportional valve is in a partially open state at this time; T is the target temperature value.

[0030] In step 1, when the integrated charging and discharging device is in the constant current charging stage (CC stage), the electronically controlled proportional valve operates between 0%, S1 and 100%. However, because the heat generated in the CC stage is greater and more stable, the electronically controlled proportional valve will basically be in S1 after the heat generation in this stage stabilizes.

[0031] During the time interval (t1~t2), the charging / discharging process transitions from the CC stage to the CV stage. Although the current decreases rapidly after entering the CV stage, the heat generated in the CC stage cannot be dissipated instantly. Simultaneously, S2 < S1. If the A2 control logic is entered directly, the cooling capacity of the water-cooling system will be significantly less than the heat generated within the integrated charging / discharging device, leading to an uncontrolled temperature rise. Therefore, the A1 control logic needs to be delayed by t. EOT1 That is, in (t1+t) EOT1 During the time interval (t1+t), A1 control logic is used; when in (t1+t) EOT1 The A2 control logic is only truly used during the time period t2.

[0032] During the time interval (t2~t3), the charging / discharging process transitions from the CV stage to the DC stage. Although the current instantly returns to the set current value upon entering the DC stage, heat accumulation within the charging / discharging device takes some time. Simultaneously, S3 > S2. If the A3 control logic is entered directly, the cooling capacity of the water-cooling system at the start of the DC stage will significantly exceed the heat generated within the integrated charging / discharging device, leading to an uncontrolled temperature drop. Therefore, the A2 control logic needs to be delayed by t. EOT2 That is, in (t2+t) EOT2 During the time interval (t2+t), A2 control logic is used; when in (t2+t) EOT2 The A3 control logic is only truly used during the time period from t to t2.

[0033] During the time interval (t3~t4), the charging / discharging process transitions from the DC stage to the DV stage. Although the current decreases rapidly upon entering the DV stage, the heat generated in the DC stage cannot be dissipated instantly. Simultaneously, S4 < S3. If the A4 control logic is entered directly, the cooling capacity of the water-cooling system will be significantly less than the heat generated within the integrated charging / discharging device, leading to a runaway temperature increase. Therefore, the A3 control logic needs to be delayed by t. EOT3 That is, in (t3+t) EOT3 During the time period (t3+t), A3 control logic is used; when in (t3+t) EOT3 The A4 control logic is only truly used during the time period from 0 to t3.

[0034] The beneficial effects of this invention are:

[0035] 1. Charging and discharging equipment exhibits different operating characteristics at each stage of charging and discharging. These characteristics cause the internal heat of the equipment to change dynamically, ultimately resulting in significant temperature fluctuations and uncontrollable temperature rise in the battery. This invention uniquely employs a segmented control logic for different charging and discharging stages. By precisely controlling the opening and closing ratio of the electronically controlled proportional valve, the cooling capacity of the water-cooling system at each stage of charging and discharging is adjusted, thereby accurately controlling the battery temperature rise and keeping battery temperature fluctuations within the technical specifications.

[0036] 2. This patent uniquely introduces the concept of control logic delay. In response to the situation where the heat inside the charging and discharging equipment cannot be dissipated instantly when the charging and discharging stages switch instantaneously (CC stage to CV stage, CV stage to DC stage, DC stage to DV stage), the control logic delay is increased to reduce the influence of heat inertia inside the charging and discharging equipment by using the front-end control logic, thereby ensuring a smooth transition of the battery temperature control curve.

[0037] 3. This patent uses an electronically controlled proportional valve, which can keep the water cooling system in a certain cooling state for a long time, thereby avoiding the disadvantage of the on / off electric valve that cannot be kept in a certain state for a long time and reducing the probability of failure of the electronically controlled valve.

[0038] 4. This patent classifies battery temperature values ​​and adjusts them in different levels (for example, the CC stage is divided into three levels of control: 0%, 70%, and 100%, and other stages are also controlled in the same way). The control logic minimizes the adjustment of the electronic control proportional valve while ensuring that the battery temperature fluctuation meets the requirements, which indirectly improves the service life of the electronic control proportional valve and ensures the stability of the integrated charging and discharging equipment. Attached Figure Description

[0039] Figure 1 This is a structural diagram of the present invention.

[0040] Figure 2a This is a flowchart of the control method of the present invention.

[0041] Figure 2b This is a flowchart of the A1 control logic of the present invention.

[0042] Figure 2c This is a flowchart of the A2 control logic of the present invention.

[0043] Figure 2d This is a flowchart of the A3 control logic of the present invention.

[0044] Figure 2e This is a flowchart of the A4 control logic of the present invention.

[0045] Figure 3 This is a schematic diagram of the control logic of the present invention. Detailed Implementation

[0046] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0048] In the description of this invention, it should be understood that the 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 used only for the convenience of describing this invention 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 this invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0054] The integrated charging and discharging device of the present invention includes a device body 1 and a water cooling system 2;

[0055] The device body 1 includes a mechanism frame 11, a motion mechanism 12, and a power supply unit 13. The inner cavity of the mechanism frame 11 is divided into a charging and discharging chamber and a heat exchange chamber by a vertical partition 14. The upper part of the vertical partition 14 is provided with an upper air duct fan 141, and the lower part is provided with a lower air duct fan 142. The motion mechanism 12 is located in the charging and discharging chamber. The motion mechanism 12 has a lifting platform 121 that lifts the tray 3 vertically. Several tray fans 122 are provided at the bottom of the lifting platform 121. The lifting platform 121 divides the charging and discharging chamber into an upper air duct and a lower air duct arranged vertically. The power supply unit 13 is located at the inner top of the mechanism frame. The power supply unit 13 is provided with several probes 131, and the probes 131 are directly opposite the lifting platform 121.

[0056] The water-cooling system 2 includes a heat exchanger 21 and a water-cooling mechanism 22. The heat exchanger 21 is located inside the heat exchange chamber and has a cold water inlet 211 and a hot water outlet 212. The water-cooling mechanism 22 is located outside the mechanism frame 11 and has a built-in water supply device and controller. The water supply port of the water supply device is connected to the cold water inlet 211 of the heat exchanger 21 through a first water supply pipe 221 and a second water supply pipe 222. The first water supply pipe 221 and the second water supply pipe 222 are connected through an electrically controlled proportional valve 223. The return water port of the water supply device is connected to the hot water outlet 212 of the heat exchanger 21 through a return water pipe 224. The electrically controlled proportional valve 223 and the water supply device are both electrically or signal connected to the controller.

[0057] In some embodiments of the present invention, the mechanism frame 11 includes an upper support plate 111 and a lower support plate 112 arranged at intervals. The upper support plate 111 and the lower support plate 112 are fixed by a vertically arranged guide rod 113. A bottom plate 114 is mounted on the inner bottom surface of the lower support plate 112. The guide rod 113 and the bottom plate 114 are located in the charging and discharging cavity, and a tray limiting member 115 is provided on the bottom plate 114 to limit the lowest vertical position of the tray 3.

[0058] In some embodiments of the present invention, the end face of the vertical partition 14 facing the charging and discharging cavity is a first face, and the end face facing the heat exchange cavity is a second face. The upper part of the first face is provided with an upper air duct fan 141, and the lower part is provided with a lower air duct fan 142. The air inlet of the upper air duct fan 141 is located on the charging and discharging cavity side, and the air outlet is located on the heat exchange cavity side, for conveying hot air in the upper air duct to the upper part of the heat exchange cavity; the air inlet of the lower air duct fan 142 is located on the heat exchange cavity side, and the air outlet is located on the charging and discharging cavity side, for conveying cold air in the lower part of the heat exchange cavity to the lower air duct.

[0059] In some embodiments of the present invention, the motion mechanism 12 includes a lifting platform 121 and a lifting cylinder 123. The lifting platform 121 is a rectangular plate, with a straight bearing 124 fixedly inserted at each of the four corners for corresponding guide rods 113 to pass through, so as to realize the sliding fit between the lifting platform 121 and the guide rods 113. Several tray fans 122 are arranged at the bottom of the lifting platform 121. The lifting platform 121 divides the charging and discharging chamber into an upper air duct and a lower air duct arranged vertically. The upper air duct contains hot air generated by charging and discharging, and the lower air duct contains cooled cold air. The lifting cylinder 123 is vertically arranged in the charging and discharging chamber of the mechanism frame 11. The telescopic end of the lifting cylinder 123 is connected to the lifting platform 121 and is used to drive the lifting platform 121 to rise and fall.

[0060] The heat exchanger 21 can be a finned heat exchanger. The hot air sent into the heat exchange chamber by the upper air duct fan 141 exchanges energy in the gap between the fins of the heat exchanger and becomes cold air. The cold air flows downward and is sent into the lower air duct by the lower air duct fan. Then it is drawn in by the tray fan 122 and blown onto the surface of the battery 4 in the tray 3, taking away the heat from the surface of the battery 4, thereby forming an internal circulation of hot and cold air in the charging and discharging chamber of the mechanism frame and the heat exchange chamber.

[0061] like Figure 1 As shown, the arrows represent the air circulation paths within the mechanism frame. Point A represents the hot air in the upper air duct; point B represents the hot air sent to the top of the heat exchanger by the upper air duct fan; point C represents the cold air after heat exchange by the heat exchanger; point D represents the cold air sent to the lower air duct by the lower air duct fan; point E represents the cold air sent to the battery surface by the tray fan; the arrow at point F represents the flow direction of the hot water generated by heat exchange by the heat exchanger; and the arrow at point G represents the flow direction of the cold water flowing out from the water-cooling equipment.

[0062] The temperature control principle of the integrated charging and discharging equipment is as follows: During the normal charging and discharging process, the battery 4 in the tray 3 inside the motion mechanism 12 and the power supply unit 13 are pressed together, and a Q is generated inside the equipment. 总 Heat is generated and forms hot air, which is drawn into the heat exchange chamber on the side of the frame by the upper air duct fan 141 through the internal air duct of the moving mechanism. The hot air exchanges heat with the heat exchanger 21 here and becomes cold air, which is then blown into the moving mechanism 12 by the lower air duct fan 142. After entering the moving mechanism 12, the cold air is drawn in by the tray fan 122, flows over the surface of the battery 4 and passes through the power supply section 13 to form hot air, thus completing the hot and cold air circulation inside the integrated charging and discharging device. The cold water inlet 211 and hot water outlet 212 of the heat exchanger 21 are respectively connected to the second water supply pipe 222 and the return water pipe 224. The second water supply pipe 222 is connected in sequence to the electronically controlled proportional valve 223, the first water supply pipe 221, and then connected to the external water cooling mechanism 22. After the heat exchanger 21 exchanges heat with the integrated charging and discharging equipment at the air end, the cooling water in the internal pipes of the heat exchanger becomes hot water. The hot water enters the external water cooling mechanism 22 through the return water pipe 224. After heat exchange in the water cooling mechanism 22, the hot water becomes cold water. The cold water flows into the internal pipes of the heat exchanger 21 through the first water supply pipe 221, the electronically controlled proportional valve 223, and the second water supply pipe 222 in sequence, and then exchanges heat to become hot water again, thereby completing the hot and cold water circulation outside the integrated charging and discharging equipment.

[0063] Currently, the industry generally divides battery charging and discharging into four stages: constant current charging stage (CC, in which the battery current remains constant and the battery voltage increases), constant voltage charging stage (CV, in which the battery voltage remains constant and the battery current decreases), constant current discharging stage (DC, in which the battery current remains constant and the battery voltage decreases), and constant voltage discharging stage (DV, in which the battery voltage remains constant and the battery current decreases).

[0064] like Figure 3 As shown, the time from 0 to t1 is the constant current charging stage, i.e., the CC stage; the time from t1 to t2 is the constant voltage charging stage, i.e., the CV stage; the time from t2 to t3 is the constant current discharging stage, i.e., the DC stage; and the time from t3 to t4 is the constant voltage discharging stage, i.e., the DV stage.

[0065] The integrated charging and discharging equipment generates heat at different stages (the heat can be simplified to Q=I). 2 *R) is inconsistent. During the constant current charging CC stage, the current remains constant at a certain set value (e.g., I=200A), and the impedance R generally changes very little during the charging and discharging stages. Therefore, the heat generated Q during the constant current charging stage is... CC Relatively stable; upon entering the constant voltage charging (CV) stage, the current rapidly decreases from the set value, resulting in heat generation Q during the constant voltage stage. CV It will drop rapidly, and Q will decrease throughout the constant voltage charging phase. CV It will continue to decline dynamically, while QCV <Q CC When the system enters the constant current discharge DC stage, the current instantaneously returns to the set value (e.g., I=200A) and remains constant. The heat generated at this time is Q. DC Relatively stable, and Q CV <Q CC =Q DC Upon entering the constant voltage discharge (DV) stage, the current rapidly decreases from the set value again, resulting in a heat generation Q during the constant voltage stage. DV It will drop rapidly, and Q DV It will continue to decline dynamically, while Q DV <Q CC =Q DC .

[0066] Given the dynamic nature of heat generation within the integrated charging and discharging equipment as the charging and discharging process progresses, the cooling capacity of the water cooling system needs to be dynamically adjusted accordingly. An electronically controlled proportional valve is employed to control the opening and closing ratio of the water cooling system, thereby further controlling its cooling capacity. Furthermore, because the heat generation differs significantly between the constant current charging and discharging stages (CC stage, DC stage) and the constant voltage charging and discharging stages (CV stage, DV stage), independent logic is used to control these corresponding stages.

[0067] The logic control method described in this invention is applied to an integrated charging and discharging device. The control method includes the following steps:

[0068] Step 1, in the range of 0 to (t1+t) EOT1 Within a given time period, the opening and closing of the electronically controlled proportional valve is manipulated using A1 control logic. t1 represents the duration of the constant current charging phase. EOT1 Delay time for A1 control logic:

[0069] S11 When the average temperature of all batteries in the tray is T AVG When the temperature is less than T-1℃, the opening and closing ratio of the electronically controlled proportional valve is 0%, meaning the proportional valve is fully closed at this time; T is the target temperature value.

[0070] S12 When the average temperature of all batteries in the tray is T AVG At temperatures greater than T+1℃, the proportional valve outputs a 100% opening / closing ratio, meaning the proportional valve is fully open at this time; T is the target temperature value.

[0071] S13 When the average temperature of all batteries in the tray is T AVG When the temperature is between (T-1℃ and T+1℃), the opening ratio of the electronically controlled proportional valve is S1, meaning that the proportional valve is in a partially open state at this time.

[0072] Step 2, in (t1+t) EOT1 )~(t2+t EOT2Within a given time period, the opening and closing of the electronically controlled proportional valve is manipulated using the A2 control logic. t2 represents the duration of the constant voltage charging phase. EOT2 Delay time for A2 control logic:

[0073] S21 When the average temperature of all batteries in the tray is T AVG When the temperature is less than T-1℃, the opening and closing ratio of the electronically controlled proportional valve is 0%, meaning the proportional valve is fully closed at this time; T is the target temperature value.

[0074] S22 When the average temperature of all batteries in the tray is T AVG At temperatures greater than T+1℃, the proportional valve outputs a 100% opening / closing ratio, meaning the proportional valve is fully open at this time; T is the target temperature value.

[0075] S23 When the average temperature of all batteries in the tray is T AVG When the temperature is between (T-1℃ and T+1℃), the opening ratio of the electronically controlled proportional valve is S2, where S2 < S1, meaning the proportional valve is in a partially open state at this time; T is the target temperature value.

[0076] Step 3, in (t2+t) EOT2 )~(t3+t EOT3 Within a given time period, the A3 control logic is used to control the opening and closing of the electronically controlled proportional valve. t3 represents the duration of the constant current discharge phase. EOT3 Delay time for A3 control logic:

[0077] S31 When the average temperature of all batteries in the tray is T AVG When the temperature is less than T-1℃, the opening and closing ratio of the electronically controlled proportional valve is 0%, meaning the proportional valve is fully closed at this time; T is the target temperature value.

[0078] S32 When the average temperature of all batteries in the tray is T AVG At temperatures greater than T+1℃, the proportional valve outputs a 100% opening / closing ratio, meaning the proportional valve is fully open at this time; T is the target temperature value.

[0079] S33 When the average temperature of all batteries in the tray is T AVG When the temperature is between (T-1℃ and T+1℃), the opening ratio of the electronically controlled proportional valve is S3. S3 is close to S1, meaning that the proportional valve is in a partially open state at this time; T is the target temperature value.

[0080] Step 4, in (t3+t) EOT3 During the time interval t4, the opening and closing of the electronically controlled proportional valve is controlled by the A4 control logic, where t4 is the duration of the constant current discharge phase.

[0081] S41 When the average temperature of all batteries in the tray is T AVGWhen the temperature is less than T-1℃, the opening and closing ratio of the electronically controlled proportional valve is 0%, meaning the proportional valve is fully closed at this time; T is the target temperature value.

[0082] S42 When the average temperature of all batteries in the tray is T AVG At temperatures greater than T+1℃, the proportional valve outputs a 100% opening / closing ratio, meaning the proportional valve is fully open at this time; T is the target temperature value.

[0083] S43 When the average temperature of all batteries in the tray is T AVG When the temperature is between (T-1℃ and T+1℃), the opening ratio of the electronically controlled proportional valve is S4. S4 is close to S2, meaning that the proportional valve is in a partially open state at this time; T is the target temperature value.

[0084] In step 1 of this invention, t EOT1 In a specific integrated charging and discharging device, the delay time can be obtained with a stable value through equipment debugging methods. In this embodiment, the prototype used in the experiment has a tEOT1 of approximately 2 minutes. However, this value cannot be used for all integrated charging and discharging devices using this method. A specific tEOT1 delay time should exist for a specific integrated charging and discharging device. This is because different integrated charging and discharging devices use different battery models and have different charging and discharging powers, resulting in varying heat generation and consequently, different tEOT1 delay times. EOT2 t EOT3 Principle and t EOT1 Similarly, in this prototype test, t EOT2 t EOT3 All of them take about 2 minutes.

[0085] In step 1 of this invention, the opening / closing ratio S1 is related to the specific integrated charging / discharging device and its environment. A stable value can be obtained by adjusting the device according to the specific environment. For example, when the integrated charging / discharging device uses a 40A current for charging / discharging, heat is generated rapidly inside the device, requiring quick cooling, so the S1 opening / closing ratio is 60%~70%. If the integrated charging / discharging device uses a 30A current for charging / discharging, the heat generated inside the device is relatively less and the process is slower, so the S1 opening / closing ratio is 40%~50%. Furthermore, when the ambient temperature exceeds 35℃, the device frequently exchanges heat with the outside environment, consuming energy, so the S1 opening / closing ratio is 60%~70%. When the ambient temperature is below 20℃, the heat exchange with the outside environment is relatively less, so the opening / closing ratio is 30%~40%. Therefore, the range of S1 cannot be generally determined; it needs to be confirmed by specifically adjusting the device according to the operating conditions and environment. Specific S1 parameters cannot be generalized and need to be discussed specifically based on the integrated charging / discharging device and its environment. It should be noted that once the specific integrated charging / discharging device and its environment are confirmed, a stable S1 parameter can be determined through equipment debugging. Furthermore, integrated charging / discharging devices generally operate at a relatively stable value over a long period. For example, once the charging / discharging current is confirmed to be 40A, it generally won't arbitrarily change to 30A or other values; therefore, S1 will also be a relatively stable value. The values ​​of the opening / closing ratios S2 and S3 are determined based on the same principle as S1, depending on the specific equipment and environment.

[0086] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A logic control method for an integrated charging and discharging device, characterized in that: The integrated charging and discharging device includes a device body (1) and a water cooling system (2); the water cooling system (2) includes an electronically controlled proportional valve (223). The logic control method includes the following steps: Step 1, in the range of 0 to (t1+t) EOT1 Within a given time period, the opening and closing of the electronically controlled proportional valve is manipulated using A1 control logic. t1 represents the duration of the constant current charging phase. EOT1 Delay time for A1 control logic: S11 When the average temperature of all batteries in the tray is T AVG At <T-1℃, the opening / closing ratio of the electronically controlled proportional valve is 0%; T is the target temperature value; S12 When the average temperature of all batteries in the tray is T AVG At temperatures exceeding T+1℃, the opening / closing ratio of the electronically controlled proportional valve is 100%. S13 When the average temperature of all batteries in the tray is T AVG When the temperature is between (T-1℃ and T+1℃), the opening and closing ratio of the electronically controlled proportional valve is S1. Step 2, in (t1+t) EOT1 )~(t2+t EOT2 Within a given time period, the opening and closing of the electronically controlled proportional valve is manipulated using the A2 control logic. t2 represents the duration of the constant voltage charging phase. EOT2 Delay time for A2 control logic: S21 When the average temperature of all batteries in the tray is T AVG At temperatures below T-1℃, the opening / closing ratio of the electronically controlled proportional valve is 0%. S22 When the average temperature of all batteries in the tray is T AVG At temperatures exceeding T+1℃, the opening / closing ratio of the electronically controlled proportional valve is 100%. S23 When the average temperature of all batteries in the tray is T AVG When the temperature is between (T-1℃ and T+1℃), the opening and closing ratio of the electronically controlled proportional valve is S2, where S2 < S1. Step 3, in (t2+t) EOT2 )~(t3+t EOT3 Within a given time period, the A3 control logic is used to control the opening and closing of the electronically controlled proportional valve. t3 represents the duration of the constant current discharge phase. EOT3 Delay time for A3 control logic: S31 When the average temperature of all batteries in the tray is T AVG At temperatures below T-1℃, the opening / closing ratio of the electronically controlled proportional valve is 0%. S32 When the average temperature of all batteries in the tray is T AVG At temperatures exceeding T+1℃, the opening / closing ratio of the electronically controlled proportional valve is 100%. S33 When the average temperature of all batteries in the tray is T AVG When the temperature is between (T-1℃ and T+1℃), the opening and closing ratio of the electronically controlled proportional valve is S3, which is close to S1. Step 4, in (t3+t) EOT3 During the time interval t4, the opening and closing of the electronically controlled proportional valve is controlled by the A4 control logic, where t4 is the duration of the constant voltage discharge phase. S41 When the average temperature of all batteries in the tray is T AVG At temperatures below T-1℃, the opening / closing ratio of the electronically controlled proportional valve is 0%. S42 When the average temperature T of all batteries in the tray is... AVG At temperatures exceeding T+1℃, the opening / closing ratio of the electronically controlled proportional valve is 100%. S43 When the average temperature of all batteries in the tray is T AVG When the temperature is between (T-1℃ and T+1℃), the opening and closing ratio of the electronically controlled proportional valve is S4, which is close to S2.

2. The logic control method for an integrated charging and discharging device as described in claim 1, characterized in that: The device body (1) includes a mechanism frame (11), a motion mechanism (12), and a power supply unit (13). The inner cavity of the mechanism frame (11) is divided into a charging and discharging cavity and a heat exchange cavity by a vertical partition (14). The upper part of the vertical partition (14) is provided with an upper air duct fan (141), and the lower part is provided with a lower air duct fan (142). The motion mechanism (12) is located in the charging and discharging cavity. The motion mechanism (12) has a lifting platform (121) that lifts the tray (3) vertically. Several tray fans (122) are provided at the bottom of the lifting platform (121). The lifting platform (121) divides the charging and discharging cavity into an upper air duct and a lower air duct arranged vertically. The power supply unit (13) is located at the top of the mechanism frame. The power supply unit (13) is provided with several probes (131), and the probes (131) are directly opposite the lifting platform (121). The water cooling system (2) includes a heat exchanger (21) and a water cooling mechanism (22). The heat exchanger (21) is located inside the heat exchange chamber and has a cold water inlet (211) and a hot water outlet (212). The water cooling mechanism (22) is located outside the mechanism frame (11). The water cooling mechanism (22) has a built-in water supply device and controller. The water supply port of the water supply device is connected to the cold water inlet (211) of the heat exchanger (21) through the first water supply pipe (221) and the second water supply pipe (222). The first water supply pipe (221) and the second water supply pipe (222) are connected through an electrically controlled proportional valve (223). The return water port of the water supply device is connected to the hot water outlet (212) of the heat exchanger (21) through the return water pipe (224). The electrically controlled proportional valve (223) and the water supply device are both electrically or signal connected to the controller. The vertical partition has a first face facing the charging / discharging cavity and a second face facing the heat exchange cavity. The first face has an upper air duct fan at the top and a lower air duct fan at the bottom. The air inlet of the upper air duct fan is located on the charging / discharging cavity side and the air outlet is located on the heat exchange cavity side, which is used to transport hot air in the upper air duct to the upper part of the heat exchange cavity. The air inlet of the lower air duct fan is located on the heat exchange cavity side and the air outlet is located on the charging / discharging cavity side, which is used to transport cold air from the lower part of the heat exchange cavity to the lower air duct.

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