Variable power new energy battery high and low temperature control method and test device

Abstract

The invention discloses a variable power new energy battery high and low temperature control method and a test device. The method comprises the following steps: obtaining a refrigeration signal or a heating signal based on an initial temperature value and a test temperature target value of a new energy battery; based on the refrigeration signal, a rapid adjustment stage and / or a precise adjustment stage are / is carried out; the operation power and the temperature change value of the compressor are obtained, and the compression refrigerating capacity, the temperature reduction rate value and the rapid adjustment temperature difference value of the compressor in unit time are obtained through calculation; further calculating to obtain the quick adjustment refrigeration demand in the quick adjustment stage; calculating to obtain the initial operation power of the compression refrigerating machine in the rapid adjustment stage; a refrigeration compressor is started, so that the temperature of the new energy battery is reduced from the initial temperature to the precise refrigeration temperature control value; then entering a precise adjustment stage; the adjustment change of the operation power of the compression refrigerating machine in the rapid adjustment stage can effectively save the electric energy consumption of the compression refrigerating machine, reduce the test influence and improve the test precision.

Description

Technical Field

[0001] This invention relates to the field of temperature control technology, specifically to a method and testing device for high and low temperature control of variable power new energy batteries. Background Technology

[0002] Nowadays, new energy has become synonymous with green and environmentally friendly practices, and new energy vehicles have gained increasing attention and recognition. New energy vehicles possess many advantages that ordinary gasoline vehicles cannot match. However, due to their relatively late start, new energy vehicles still have many shortcomings. For example, the battery pack generates a large amount of heat during long-term operation and charging / discharging. This heat needs to be dissipated through the vehicle's internal cooling system. If the heat is not dissipated in time, it may damage the battery pack, and in severe cases, may lead to spontaneous combustion. In cold winters, the battery pack's efficiency gradually decreases as the temperature drops. Therefore, a stable battery pack temperature control system is crucial. This system consists of a cooling device and a heating device; the proper matching of the power of these two devices determines the stable operation of the battery pack temperature control system.

[0003] To properly match the power of cooling and heating devices, a variable-power high and low temperature testing device is needed to simulate the required cooling and heating capacity under various environments. Traditional temperature control equipment typically only meets the needs of temperature control; that is, based on the set target temperature, the temperature control equipment adjusts its own energy, increases or decreases the compressor load or adjusts the number of operating units, and regulates the output power of the heater to approach the target temperature.

[0004] This control method results in high energy consumption and low temperature control accuracy. Furthermore, when controlling the temperature changes of new energy batteries in real time, it is impossible to accurately and quickly stabilize the target temperature of the new energy battery test. This can easily cause multiple temperature changes in the new energy battery during temperature simulation, thus affecting the test results. Summary of the Invention

[0005] The purpose of this invention is to provide a method and testing device for high and low temperature control of variable power new energy batteries, so as to solve the problems mentioned above.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A method for high and low temperature control of variable power new energy batteries includes the following steps:

[0008] Temperature adjustment signals are obtained based on the initial temperature value CT and the target test temperature value MB of the new energy battery. The temperature adjustment signals include cooling signals and heating signals.

[0009] Based on the cooling signal, cooling regulation is performed; a rapid regulation phase and / or a precise regulation phase are performed.

[0010] Obtain the compressor's operating power and label it YP; calculate the compressor's cooling capacity YZL per unit time t using the compression cooling capacity formula; obtain the temperature change value TB of the new energy battery; and through... Calculate and obtain the temperature reduction rate value JYS of new energy batteries under unit cooling capacity;

[0011] The rapid adjustment temperature difference value WC is obtained through calculation; The fast-adjustment cooling demand KZLx during the rapid adjustment phase is calculated.

[0012] Obtain the adjustment power PT of the compressor operating power within a unit time t and the change in compressed refrigeration capacity ZLT as the adjustment power PT changes with the operating power; obtain the minimum operating power Pn of the compressor; calculate the compressed refrigeration capacity YZLn generated per unit time t when the minimum operating power Pn of the compressor is obtained.

[0013] Calculate the initial operating power PS of the compressor during the fast adjustment phase;

[0014] Start the refrigeration compressor to run at its initial operating power PS, thereby reducing the temperature of the new energy battery from the initial temperature CT to the precise temperature control value MBJ; then enter the precise adjustment stage.

[0015] Heating is regulated based on the heating signal.

[0016] As a further aspect of the present invention: the initial temperature CT is compared with the target test temperature value MB;

[0017] If the initial temperature CT is greater than the target test temperature MB, a cooling signal is obtained.

[0018] If the initial temperature CT is less than the target test temperature MB, a heating signal is obtained.

[0019] As a further aspect of the present invention: determining whether the initial temperature falls within the target range [MB, MBJ] for precise temperature control of refrigeration;

[0020] If the initial temperature CT is not within the target range of precise temperature control for cooling [MB, MBJ], it enters the rapid adjustment phase.

[0021] If the initial temperature CT is within the target range of precise temperature control for cooling [MB, MBJ], it enters the precise adjustment stage.

[0022] As a further aspect of the present invention: the initial operating power PS is obtained as follows:

[0023] Taking the refrigeration capacity YZLn when the compressor operating power is at its minimum value Pn as an example, when the compressor operating power increases, the change of its refrigeration capacity YZL(t) with time is: YZL(t) = YZLn + ZLT × t; at this time, it is necessary to calculate the fast-adjustment time value T of the fast-adjustment refrigeration demand KZLx; the total refrigeration, i.e., KZLx, is the integral over the refrigeration capacity YZL(t), that is: By fitting the expression YZL(t) into the integral formula for total cooling capacity, the fast-adjustment time T required to reach the total cooling capacity KZLx can be calculated. Since the time value is positive, i.e.

[0024] The operating power Pm of the compressor refrigeration unit when the total refrigeration capacity KZLx is reached is calculated by using Pm = Pn + ZLT × T.

[0025] The calculation shows that when the compressor increases from its operating power Pn with an adjustment power PT per unit time t, the fast-adjustment cooling demand KZLx can be obtained when it reaches Pm after an increase time T. Similarly, when the compressor decreases from its operating power Pm with an adjustment power PT per unit time t, the fast-adjustment cooling demand KZLx can be obtained when it decreases to its operating power Pn. Therefore, the operating power Pm is the initial operating power PS.

[0026] As a further aspect of the present invention: the precise adjustment stage involves precisely adjusting the temperature of the new energy battery; including: operating the refrigeration compressor at its minimum operating power Pn; and adjusting the quick-opening valve ratio FK based on the temperature changes of the new energy battery.

[0027] Obtain the output ratio of the quick-opening valve and mark the output ratio value of the quick-opening valve as FK; based on this, obtain several data, including the output ratio value of the quick-opening valve FK and the counter-current temperature reduction rate value JYDS per unit time t when the compressor operates at power YP;

[0028] The influence of temperature change on the quick-opening valve is modeled using JYDS=(YZL-YZDL). ) ×JYS, i.e. Calculate the offset cooling capacity YZDL when the compressor operating power is YP, and obtain the proportional value FK of the quick-opening valve output within a unit time t.

[0029] pass Calculate the following: when the compressor operating power YP is at the output ratio value FK of the quick-opening valve, the offset cooling capacity value YZDL of the quick-opening valve to the cooling capacity within a unit time t, the influence coefficient b of the output ratio of the quick-opening valve and the compressor operating power on the cooling capacity; and the influence value c of the offset cooling capacity deviation.

[0030] The actual cooling capacity YZJL is obtained by calculating YZJL = YZL - YZDL when the compressor is at its operating power YP and the output ratio of the quick-opening valve is FK at a unit time t.

[0031] The actual cooling capacity YZJLn is obtained when the refrigeration compressor is at its minimum operating power Pn and the output ratio of the quick-opening valve is FK.

[0032] The change in temperature of the new energy battery per unit time when the refrigeration compressor operates at its minimum operating power Pn and the output ratio of the quick-opening valve is FK is obtained by calculating JT = YZJLn × JYS. This is the precise temperature adjustment value, which is marked as JT.

[0033] Based on the temperature adjustment requirements of new energy batteries, the size of the precise temperature adjustment value JT is controlled to ensure that the new energy battery is stably and accurately regulated from the precise cooling temperature control value MBJ to the target test temperature value MB.

[0034] Once the temperature of the new energy battery reaches the target test temperature value MB, the output ratio of the quick-opening valve is increased to balance the cooling capacity of the refrigeration compressor and the quick-opening valve with the heat dissipation of the new energy battery.

[0035] As a further aspect of the present invention: the step of adjusting the heating based on the heating signal includes;

[0036] Determine whether the initial temperature falls within the target range for precise heating temperature control [MBR, MB];

[0037] If the initial temperature CT is not within the target range of precise heating temperature control [MBR, MB], the direct adjustment stage is entered.

[0038] If the initial temperature CT is within the target range of precise heating temperature control [MBR, MB], the system enters the feedback adjustment phase.

[0039] As a further aspect of the present invention: entering the direct adjustment stage, the temperature of the new energy battery is directly adjusted;

[0040] During the heating process, the heating temperature rise rate of the new energy battery at time nodes with unit time intervals t is obtained and labeled as WS i, where i is the node number, i.e. the temperature rise rate at time point after the i-th unit time t; at the same time, the heating temperature value is obtained and labeled as WTZ i.

[0041] The heating temperature value WTZi of the new energy battery is obtained, and the heating temperature rise rate WSi is obtained when the heating precise temperature control value MBR is reached.

[0042] Compare the heating temperature rise rate Wi with the preset heating temperature rise rate threshold WSY.

[0043] If the heating temperature rise rate WSi is greater than the preset heating temperature rise rate threshold WSY, then a temperature rise / fall rate signal is generated.

[0044] If the heating rate WSi is less than or equal to the preset heating rate threshold WSY, a stable heating rate signal is generated.

[0045] As a further aspect of the present invention: based on the temperature rise and fall rate signal, the heating temperature rise and fall rate value WSJ is calculated by WSJ = WS i - WSY; that is, the temperature value within a unit time t during the heating process needs to be reduced by WSJ; based on the temperature reduction rate value JYS of the new energy battery under a unit cooling capacity; the heating temperature rise and fall rate cooling capacity ZRJL is calculated.

[0046] The heating and cooling power PZJ of the refrigeration compressor is calculated using the compression refrigeration capacity formula.

[0047] This allows the new energy battery to rise at the heating temperature rise rate threshold WSY; at the same time, the voltage of the heating element and the power of the compressor are reduced, while maintaining the new energy battery rising at the heating temperature rise rate threshold WSY until the temperature of the new energy battery rises from MBR to the test temperature target value MB.

[0048] As a further aspect of this invention: based on the stable temperature rise rate signal, the refrigeration compressor is turned on, so that the refrigeration power of the refrigeration compressor is kept at the minimum operating power value Pn, and at the same time, the output ratio of the quick-opening valve is opened to the maximum value, i.e., FKmax; so that the refrigeration capacity of the refrigeration compressor and the counter-cooling capacity are balanced. At this time, the temperature of the new energy battery rises at the heating temperature rise rate WSi; until the temperature value of the new energy battery rises from MBR to the test temperature target value MB; the quick-opening valve is closed, so that the heating temperature rise and cooling temperature drop of the new energy battery are balanced.

[0049] As a further aspect of the present invention: a variable power new energy battery high and low temperature testing device, the variable power new energy battery high and low temperature testing device includes a variable power new energy battery high and low temperature control system, the variable power new energy battery high and low temperature control system is used to execute the above-mentioned variable power new energy battery high and low temperature control method.

[0050] The beneficial effects of this invention are:

[0051] (1) In this invention, the temperature control of the refrigeration process is first achieved by high-power rapid adjustment. During the rapid adjustment process, the rapid adjustment refrigeration demand required by the new energy battery when it is adjusted to the precise temperature control value is calculated based on the test temperature target value of the new energy battery. The initial operating power of the compressor refrigeration machine during the rapid adjustment refrigeration process is calculated based on the rapid adjustment refrigeration demand. Then, the refrigeration compressor is reduced from the initial operating power to the minimum operating power during the refrigeration compression process, so that the new energy battery can be reduced from the initial temperature to the precise temperature control value. The adjustment and change of the operating power of the compressor refrigeration machine during the rapid adjustment stage can effectively save the power consumption of the compressor refrigeration machine.

[0052] In addition, when the temperature of the new energy battery reaches the precise temperature control value for cooling, a precise adjustment stage is then implemented. During this stage, a quick-opening valve is used to allow the refrigeration compressor to maintain its minimum power operation while still achieving a counter-current effect by returning the total cooling volume during the cooling process. Furthermore, by controlling the opening ratio of the quick-opening valve, precise temperature control of the new energy battery can be achieved. The intervention of the quick-opening valve can also improve the accuracy of temperature control during the testing of the new energy battery, thereby ensuring the accuracy of subsequent test data.

[0053] (2) In the present invention, when it is necessary to heat the new energy battery to raise its temperature in order to test its performance, the heating process is controlled by the heating tube and the refrigeration compressor. This allows the new energy battery to reach the target temperature value directly in a single heating process. Through the bidirectional feedback adjustment of the heating tube and the refrigeration compressor, the heating rate of the new energy battery is controlled more accurately during the heating process. This avoids the situation where the temperature of the new energy battery rises and falls continuously before the test, which would affect the test results of the new energy battery and better ensure the accuracy of the test of the new energy battery at high temperature. Attached Figure Description

[0054] The invention will now be further described with reference to the accompanying drawings.

[0055] Figure 1 This is a schematic diagram of the control method steps of the present invention;

[0056] Figure 2 This is a schematic diagram of the rapid adjustment stage in the control method of the present invention;

[0057] Figure 3 This is a schematic diagram of the control principle of the testing device in this invention. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] Example 1

[0060] Please see Figure 1 As shown, a high and low temperature test control method for variable power new energy batteries includes:

[0061] Step 1: Obtain the temperature adjustment signal based on the initial temperature value CT and the target test temperature value MB of the new energy battery. The temperature adjustment signal includes a cooling signal and a heating signal.

[0062] Step 2: Based on the cooling signal, perform cooling adjustment; including a rapid adjustment phase and / or a precise adjustment phase;

[0063] Step 3: Based on the heating signal, perform heating regulation; including a direct regulation stage and / or a feedback regulation stage.

[0064] Example 2

[0065] A method for high and low temperature testing and control of variable power new energy batteries includes:

[0066] S01: Acquire initial state data of the new energy battery; including the initial temperature value CT of the new energy battery; acquire test data of the new energy battery; the test data includes the target test temperature value MB;

[0067] The initial temperature CT is compared with the target test temperature MB; the temperature adjustment signal is obtained, which includes a cooling signal and a heating signal.

[0068] If the initial temperature CT is greater than the target test temperature MB, and a cooling signal is obtained, then proceed to step S02.

[0069] If the initial temperature CT is less than the target test temperature MB, and a heating signal is obtained, then proceed to step S03.

[0070] S02: Based on the refrigeration signal, refrigeration regulation is performed. The steps of refrigeration regulation include: starting the compressor to compress the high-temperature and high-pressure refrigerant, then condensing it through the condenser to obtain high-pressure liquid refrigerant, then drying and filtering it through the dryer filter and entering the regenerator jacket, where it evaporates and then exchanges heat with the gaseous refrigerant coming out of the evaporator; during this process, when the refrigeration temperature approaches the test temperature target value MB, the quick-opening valve in the hot gas bypass line opens to achieve temperature control regulation;

[0071] The cooling regulation process is a multi-stage, multi-feedback process: that is, the cooling regulation process requires multiple stages and multiple feedback adjustments; the multi-stage, multi-feedback process includes a rapid adjustment stage and a precise adjustment stage.

[0072] Specifically:

[0073] S021: Based on the target temperature value MB, determine whether the initial temperature belongs to the target value range [MB, MBJ] of precise temperature control for refrigeration.

[0074] If the initial temperature CT is not within the target range of precise temperature control for cooling [MB, MBJ], then execute S022; that is, the rapid adjustment phase.

[0075] If the initial temperature CT is within the target range of precise temperature control for cooling [MB, MBJ], then execute S023; that is, the precise adjustment phase.

[0076] It should be noted that the precise temperature control value MBJ in this step refers to the temperature critical point between the rapid adjustment phase and the precise adjustment phase of the new energy battery temperature during the cooling process. The target range for precise temperature control [MB, MBJ] is the temperature range during the precise adjustment phase of the new energy battery temperature regulation process, while the cooling temperature limit value MBJx is set by the testing personnel according to the testing requirements of the new energy battery. MBJx = MBJ - MB. To avoid excessive temperature adjustment errors, the cooling temperature limit value MBJx can be set relatively large to allow for better precise adjustment via the quick-opening valve.

[0077] S022: Based on the cooling signal, enter the rapid adjustment phase to quickly adjust the temperature of the new energy battery: (Refer to...) Figure 2 As shown;

[0078] Specifically, it includes:

[0079] S0221: Obtain the compressor operating power and mark it as YP; simultaneously, use the compression refrigeration capacity formula... Calculate the compressor's cooling capacity YZL within a unit time t; it should be noted that in the formula for calculating the cooling capacity YZL, the compressor's operating power YP is in kW / h; the unit of time t is s; and a is the correction value for the deviation caused by compressor operating losses.

[0080] S0222: Obtain the temperature change value TB of the new energy battery based on the compression cooling capacity YZL within a unit time t; through... Calculate and obtain the temperature reduction rate value JYS of new energy batteries under unit cooling capacity;

[0081] S0223: The rapid adjustment temperature difference value WC is obtained by calculating WC = CT - MBJ; this rapid adjustment temperature difference value WC is the temperature reduction required for the new energy battery to decrease from the initial temperature CT to the precise cooling temperature control MBJ.

[0082] Then through The fast-adjustment cooling demand KZLx during the rapid adjustment phase is calculated.

[0083] S0224: Obtain the adjustment power PT of the compressor operating power within a unit time t;

[0084] At this point, the change ZLT of the compressed refrigeration capacity per unit time t as a function of the regulating power PT of the operating power can be obtained, where,

[0085] Simultaneously, obtain the minimum operating power of the compressor, Pn; based on the minimum operating power of the compressor, calculate the compressed cooling capacity YZLn generated per unit time t when the compressor operates at the minimum power, Pn, using the compressed cooling capacity formula;

[0086] S0225: Calculate the initial operating power PS of the compressor during the fast adjustment phase;

[0087] Specifically, the method for obtaining the initial operating power PS is as follows:

[0088] Taking the refrigeration capacity YZLn when the compressor operating power is at its minimum value Pn as an example, when the compressor operating power increases, the change of its refrigeration capacity YZL(t) with time is: YZL(t) = YZLn + ZLT × t; at this time, it is necessary to calculate the fast-adjustment time value T of the fast-adjustment refrigeration demand KZLx; the total refrigeration, i.e., KZLx, is the integral over the refrigeration capacity YZL(t), that is: By fitting the expression YZL(t) into the integral formula for total cooling capacity, the fast-adjustment time T required to reach the total cooling capacity KZLx can be calculated. Since the time value is positive, i.e.

[0089] At this point, the operating power Pm of the compressor refrigeration unit when the total refrigeration capacity KZLx is reached can be calculated by using Pm = Pn + ZLT × T.

[0090] At this point, it can be calculated that when the compressor increases from its operating power Pn with an adjustment power PT per unit time t, and reaches Pm after an increase time T, the fast-adjustment cooling demand KZLx can be obtained; similarly, conversely, when the compressor decreases from its operating power Pm with an adjustment power PT per unit time t, and decreases back to its operating power Pn, the fast-adjustment cooling demand KZLx can be obtained; therefore, the operating power Pm is the initial operating power PS.

[0091] S0226: Start the refrigeration compressor, allowing it to run at its initial operating power PS, and then reduce the power PT by adjusting it at a rate of t per unit time until the initial operating power PS is reduced to the minimum operating power Pn of the compressor; this reduces the temperature of the new energy battery from the initial temperature CT to the precise temperature control value MBJ; then execute S023: It should be noted that during the testing of the new energy battery, this method is applied to a stable testing device. In the temperature control of the new energy battery, it can maximize the high utilization rate of the cooling capacity. If the refrigeration capacity experiences a slight loss during the cooling process, and the initial temperature has not yet reached the precise temperature control value MBJ after the power of the refrigeration compressor has dropped to the minimum operating power, then the power of the refrigeration compressor is maintained at Pn and it continues to run for the corresponding time so that the temperature of the new energy battery reaches the precise temperature control value MBJ.

[0092] S023: Entering the precise adjustment stage, the temperature of the new energy battery is precisely adjusted;

[0093] Specifically, this includes: operating the refrigeration compressor at its minimum operating power Pn; and simultaneously adjusting the quick-opening valve ratio FK based on the temperature changes of the new energy battery.

[0094] S0231: Obtain the output ratio of the quick-opening valve and mark the output ratio value of the quick-opening valve as FK; based on this, obtain several data, including the output ratio value of the quick-opening valve FK and the counter-current temperature reduction rate value JYDS per unit time t when the compressor operates at power YP.

[0095] At this point, the effect of temperature change on the counteracting effect is calculated using the quick-opening valve: JYDS = (YZL - YZDL) × JYS, i.e. Calculate the offset cooling capacity YZDL when the compressor operating power is YP, and obtain the proportional value FK of the quick-opening valve output within a unit time t.

[0096] pass Calculate the following: when the compressor operating power YP is at the output ratio value FK of the quick-opening valve, the offset cooling capacity value YZDL of the quick-opening valve to the cooling capacity within a unit time t, the influence coefficient b of the output ratio of the quick-opening valve and the compressor operating power on the cooling capacity; and the influence value c of the offset cooling capacity deviation.

[0097] S0232: Based on this, the actual cooling capacity YZJL when the compressor is at its operating power YP and the output ratio of the quick-opening valve is FK can be calculated using YZJL = YZL - YZDL; that is...

[0098] Furthermore, the actual cooling capacity YZJLn can be obtained when the refrigeration compressor is at its minimum operating power Pn and the output ratio of the quick-opening valve is FK.

[0099] S0233: Based on this, the temperature change of the new energy battery per unit time when the refrigeration compressor operates at the minimum operating power Pn and the output ratio of the quick-opening valve is FK is obtained by calculating JT=YZJLn×JYS, which is the precise temperature adjustment value and marked as JT;

[0100] At this point, the temperature value JT can be precisely adjusted according to the temperature adjustment requirements of the new energy battery, so that the temperature change accuracy of the new energy battery within a unit time t is optimal, and the new energy battery can be stably and accurately regulated from the precise cooling temperature control value MBJ to the test temperature target value MB.

[0101] In this step, if the initial temperature CT is within the target range of precise temperature control for cooling [MB, MBJ], then according to the temperature adjustment requirements of the new energy battery, the precise adjustment temperature value JT is controlled to ensure that the temperature change accuracy of the new energy battery within a unit time t is optimal, so that the new energy battery is stably and accurately controlled from the initial temperature CT to the test temperature target value MB.

[0102] It should be noted that by adjusting the output ratio of the quick-opening valve, precise control of the temperature change of the new energy battery can be achieved, and the temperature of the new energy battery can also be kept stable. That is, the refrigeration compressor works with the quick-opening valve during the refrigeration process to keep its refrigeration capacity and the temperature of the new energy battery in this state constant at the test temperature target value MB. Then, by controlling the refrigeration effect of the compressor and the quick-opening valve to remain constant, the new energy battery can be tested. This can achieve tests on the effects of low temperature on new energy, such as the charge and discharge rate of new energy batteries at low temperature, and the internal resistance and energy storage capacity of new energy batteries at low temperature.

[0103] S0234: When the temperature of the new energy battery reaches the target test temperature value MB, the output ratio of the quick-opening valve is increased to balance the cooling capacity of the refrigeration compressor and the quick-opening valve with the heat dissipation of the new energy battery; then the new energy battery can be tested.

[0104] The temperature control of the cooling process is first achieved through high-power rapid adjustment. During the rapid adjustment, the rapid cooling demand required by the new energy battery to adjust to the precise cooling temperature control value is calculated based on the test temperature target value of the new energy battery. The initial operating power of the compressor during the rapid cooling process is then calculated based on the rapid cooling demand. The compressor is then reduced from its initial operating power to its minimum operating power during the cooling compression process, thereby reducing the temperature of the new energy battery from its initial temperature to the precise cooling temperature control value. The adjustment and change of the operating power of the compressor during this rapid adjustment phase can effectively save the energy consumption of the compressor.

[0105] In addition, when the temperature of the new energy battery reaches the precise temperature control value for cooling, a precise adjustment stage is then implemented. During this stage, a quick-opening valve is used to allow the refrigeration compressor to maintain its minimum power operation while still achieving a counter-current effect by returning the total cooling volume during the cooling process. Furthermore, by controlling the opening ratio of the quick-opening valve, precise temperature control of the new energy battery can be achieved. The intervention of the quick-opening valve can also improve the accuracy of temperature control during the testing of the new energy battery, thereby ensuring the accuracy of subsequent test data.

[0106] S03: Based on the heating signal, heating regulation is performed. The heating regulation steps are as follows: the heating tube is placed in the liquid storage tank using a U-shaped light tube. Based on the test target temperature value MB, the output ratio of the heating voltage is adjusted through a three-phase voltage regulator, and a mechanical temperature protection switch is provided. At the same time, during the heating process of the new energy battery by the heating tube, the cooling regulation structure, i.e., the cooling compressor, remains in standby mode to cooperate with the heating tube to perform temperature control and equalization of the new energy battery.

[0107] Specifically:

[0108] S031: Based on the target temperature value MB, determine whether the initial temperature belongs to the heating precision temperature control target range [MBR, MB];

[0109] If the initial temperature CT is not within the target range of precise heating temperature control [MBR, MB], then execute S032; that is, the direct adjustment stage.

[0110] If the initial temperature CT is within the target range of precise heating temperature control [MBR, MB], then execute S033; that is, the feedback adjustment phase.

[0111] In this step, the precise temperature control value MBR is the temperature critical point of the new energy battery during the heating process, specifically between the direct adjustment phase and the feedback adjustment phase. It should be noted that the target temperature control range [MBR, MB] is the temperature range during the feedback adjustment phase of the new energy battery temperature regulation process. The critical heating value MBRy is set by the testing personnel according to the testing requirements of the new energy battery, where MBRy = MB - MBR. To avoid residual heat affecting the new energy battery temperature after the heating system stops heating, a larger MBRy threshold is set to better increase the time value of the feedback adjustment phase and ensure the accuracy of the test under high-temperature regulation.

[0112] S032: Based on the heating signal, it enters the direct regulation stage to directly regulate the temperature of the new energy battery;

[0113] The heating element is activated to heat the new energy battery. At the same time, the heating temperature rise rate of the new energy battery at time nodes with unit time t during the heating process is obtained and marked as WS i, where i is the node number, that is, the temperature rise rate at time point after the i-th unit time t; at the same time, the heating temperature value is obtained and marked as WTZ i.

[0114] S033: Obtain the heating temperature value WTZi of the new energy battery and the heating temperature rise rate WSi when the heating precise temperature control value MBR is reached;

[0115] S034: Compare the heating temperature rise rate WSi with the preset heating temperature rise rate threshold WSY;

[0116] If the heating rate WSi is greater than the preset heating rate threshold WSY, then generate a heating rate increase / decrease signal; execute S035.

[0117] If the heating rate WSi is less than or equal to the preset heating rate threshold WSY, then a stable heating rate signal is generated; execute S036.

[0118] It should be noted that the preset heating temperature rise rate threshold WSY is determined by the rate at which the cooling capacity generated by the refrigeration compressor can cause the new energy battery to decrease when the refrigeration compressor maintains the minimum operating power Pn and the quick-opening valve is closed; that is, in this case, the heating value and the cooling value can be balanced.

[0119] S035: Based on the temperature rise and fall rate signal, the heating temperature rise and fall rate value WSJ is obtained by calculating WSJ = WS i - WSY; that is, the temperature value within a unit time t during the heating process needs to be reduced by WSJ; based on the temperature reduction rate value JYS of the new energy battery under a unit cooling capacity in S0222;

[0120] pass Right now The heating temperature rise / fall rate and cooling capacity ZRJL are calculated.

[0121] Furthermore, by using the compression refrigeration capacity formula, the heating and cooling power PZJ of the refrigeration compressor is calculated; that is...

[0122] This allows the new energy battery to rise at the heating temperature rise rate threshold WSY; simultaneously, the voltage of the heating element and the power of the compressor are reduced, while maintaining the new energy battery at the heating temperature rise rate threshold WSY until the temperature of the new energy battery rises from MBR to the target test temperature value MB; it should be noted that during the process of reducing the temperature rise rate of the new energy battery, the cooling capacity generated by the power of the compressor is balanced with the heating capacity of the heating element when the voltage U of the heating element decreases;

[0123] In this step, the cooling capacity of the refrigeration compressor per unit time t can be obtained by the formula for calculating the cooling capacity of the compressor, and the heating capacity of the heating element is adjusted by controlling the voltage value of the heating element. The heating capacity of the heating element per unit time t is calculated by multiplying the square of the voltage value and the resistance value of the heating element.

[0124] S036: Based on the stable temperature rise rate signal, the refrigeration compressor is started, ensuring that its refrigeration power operates at the minimum value Pn. Simultaneously, the output ratio of the quick-opening valve is opened to its maximum value, FKmax, balancing the refrigeration capacity of the compressor and the counter-cooling capacity. At this point, the temperature of the new energy battery increases at the heating temperature rise rate WSi until the battery temperature rises from MBR to the target test temperature value MB. Then, the quick-opening valve closes, balancing the heating temperature rise and cooling temperature drop of the new energy battery. Throughout this process, the minimum refrigeration capacity of the compressor is used for adjustment, allowing for precise temperature regulation with minimal energy consumption. This improves the accuracy of temperature control and reduces overall energy consumption.

[0125] In the testing of new energy batteries, when it is necessary to heat the new energy battery to raise its temperature in order to test its performance, it is necessary to heat the new energy battery so that it can be tested under high temperature conditions, such as simulating the discharge efficiency and charging efficiency of the new energy battery under long-term sunlight exposure.

[0126] During the heating process of the new energy battery, the heating process is jointly controlled by the heating element and the refrigeration compressor. This allows the new energy battery to reach the target test temperature value directly in a single heating process. Through bidirectional feedback regulation of the heating element and the refrigeration compressor, the heating rate of the new energy battery during the heating process is controlled more precisely, avoiding continuous temperature rises and falls before testing, which would affect the test results and better ensure the accuracy of the new energy battery test at high temperatures.

[0127] Example 3

[0128] A variable power new energy battery high and low temperature testing device is provided. The device adopts the variable power new energy battery high and low temperature testing control method as described in Example 2 to realize the control of the new energy battery testing temperature by the variable power new energy battery high and low temperature testing device.

[0129] Example 4

[0130] Reference Figure 3 As shown, a high and low temperature testing device for variable power new energy batteries includes the following modes:

[0131] In cooling mode, the compressor compresses the gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The oil separator separates the refrigeration oil carried in the refrigerant vapor, which returns to the compressor through the oil return pipe. After passing through the condenser, it is condensed into a high-pressure liquid refrigerant. The dryer filter removes impurities and moisture, and then the liquid refrigerant enters the throttling device. The throttled liquid refrigerant first passes through the regenerator, where it evaporates and exchanges heat with the gaseous refrigerant coming out of the evaporator, ensuring that the compressor's return gas temperature is not too high.

[0132] In cooling mode, when the temperature drops close to the set value, the hot gas bypass function starts to intervene and participate in the adjustment of cooling capacity, that is, the temperature control requirement is achieved through the output ratio of the quick-opening valve.

[0133] Meanwhile, the hot gas bypass can be manually adjusted by installing a copper ball valve, and a silencer can be installed at the rear to ensure that there is not much airflow noise during the hot gas bypass process.

[0134] In heating mode, the heating element is a U-shaped light tube placed inside the liquid storage tank. According to the set temperature value, the heating voltage is adjusted by a three-phase voltage regulator, thereby adjusting the output ratio of heating power. It is equipped with a mechanical temperature protection switch and a cooling medium flow switch to effectively prevent the heating element from dry burning.

[0135] Example 5

[0136] Based on the above-mentioned variable power new energy battery high and low temperature testing device, it also includes:

[0137] In the counter-mode, when there is no external load or a low load, the cooling capacity generated by an independent small refrigeration system is used to maintain a constant temperature of the circulating cooling medium. The compressor power of the small refrigeration system is very small, and the refrigeration principle is relatively simple. Once the main compressor stops, it immediately enters the counter-mode, and the counter-compressor starts. The flow rate of the medium entering the counter-evaporator is controlled by an electric regulating valve, thereby precisely controlling the cooling capacity required for the counter-mode.

[0138] In air conditioning mode, an independent air conditioning system is used for cooling. The system automatically controls the operation of the air conditioning compressor by detecting the temperature inside the cabinet, thereby maintaining a constant temperature inside the cabinet and allowing the electrical components inside the cabinet to work at an ideal temperature for a long time.

[0139] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A high and low temperature control method for a variable power new energy battery, characterized in that: The following steps are involved: A temperature adjustment signal is obtained based on an initial temperature value CT of the new energy battery and a test temperature target value MB, wherein the temperature adjustment signal includes a cooling signal and a heating signal; Based on the refrigeration signal, perform refrigeration regulation; perform a rapid regulation phase and / or a precise regulation phase; Get the compressor operating power and mark it as YP; calculate the compression cooling capacity YZL of the compressor per unit time t through the compression cooling capacity formula; get the temperature change value TB of the new energy battery; Calculate and obtain the temperature reduction rate value JYS of the new energy battery under unit cooling capacity; Calculate and obtain the rapid adjustment temperature difference value WC; Calculate and obtain the fast-adjustment cooling demand KZLx in the fast-adjustment stage; Obtain the regulating power PT of the compressor operating power within unit time t and the change ZLT of the compressed cooling capacity as the regulating power PT of the operating power changes; obtain the minimum value Pn of the compressor operating power; calculate the compressed cooling capacity YZLn generated per unit time t when the minimum value Pn of the compressor operating power is obtained; Calculate and obtain the initial operating power PS of the compression refrigerator in the fast adjustment stage; Start the refrigeration compressor and make it run at the initial operating power PS, so that the temperature of the new energy battery is reduced from the initial temperature CT to the refrigeration precise temperature control value MBJ; then enter the precise adjustment stage; Based on the heating signal, heating adjustment is performed.

2. A high and low temperature control method for a variable power new energy battery according to claim 1, characterized in that: Compare the initial temperature CT with the test temperature target value MB; If the initial temperature CT is greater than the test temperature target value MB; Get the cooling signal: If the initial temperature CT is less than the test temperature target value MB; Get the heating signal.

3. A high and low temperature control method for a variable power new energy battery according to claim 1, characterized in that: Determine whether the initial temperature belongs to the target range of refrigeration precise temperature control [MB, MBJ]; If the initial temperature CT is not within the refrigeration precise temperature control target value range [MB, MBJ], it enters the rapid adjustment stage; If the initial temperature CT is within the refrigeration precise temperature control target value range [MB, MBJ], the precise adjustment stage is entered.

4. A high and low temperature control method for a variable power new energy battery according to claim 1, characterized in that: The initial operating power PS is obtained as follows: Taking the compressed cooling capacity YZLn when the compressor operating power is the minimum value Pn, when the compressor operating power increases, the change of its compressed cooling capacity YZL(t) with time is: YZL(t) = YZLn + ZLT × t; at this time, it is necessary to calculate the fast adjustment time value T of the fast adjustment cooling demand KZLx; the total cooling amount KZLx is the integral of the compressed cooling capacity YZL(t), that is: By inserting the expression YZL(t) into the total cooling amount integral formula, the fast adjustment time value T required to reach the total cooling amount KZLx can be calculated. Since the time value is a positive value, that is, By calculating Pm=Pn+ZLT×T, the operating power Pm of the compression refrigerator when the total refrigeration capacity KZLx is reached is calculated; It is calculated that when the compression refrigerator is increased from the operating power Pn at the regulating power PT per unit time t, when it reaches Pm after the increasing time T, the quick-adjusting refrigeration demand KZLx can be obtained; similarly, conversely, when the compression refrigerator is reduced from the operating power Pm at the regulating power PT per unit time t, when it is reduced to the operating power Pn, the quick-adjusting refrigeration demand KZLx can be obtained; therefore, the operating power Pm is the initial operating power PS.

5. The high and low temperature control method of a variable power new energy battery according to claim 1 is characterized in that: In the precise adjustment stage, the temperature of the new energy battery is precisely adjusted; specifically: the refrigeration compressor is operated at the minimum operating power Pn; the fast opening valve ratio FK is adjusted based on the temperature change of the new energy battery; The output ratio of the quick-opening valve is obtained, and the output ratio value of the quick-opening valve is marked as FK; based on this, several data are obtained, including the output ratio value FK of the quick-opening valve and the hedge temperature reduction rate value JYDS per unit time t when the compressor operates at power YP; The model of temperature change is offset by quick opening valve: JYDS = (YZL-YZDL) × JYS, that is Calculate and obtain the offset cooling capacity YZDL when the quick-opening valve outputs a proportional value FK and the compressor operating power is YP within a unit time t; pass Calculate and obtain the output ratio value FK of the quick opening valve under the compressor operating power YP, the offset cooling capacity value YZDL of the quick opening valve on the cooling capacity per unit time t, the influence coefficient b of the output ratio of the quick opening valve and the compressor operating power on the cooling capacity; the offset cooling capacity deviation influence value c; The actual cooling capacity YZJL when the compressor is at operating power YP and the output ratio of the quick opening valve is FK is calculated by YZJL=YZL-YZDL per unit time t; Get the actual cooling capacity YZJLn when the refrigeration compressor is at the minimum operating power value Pn and the output ratio of the quick opening valve is FK; The temperature change per unit time of the new energy battery when the refrigeration compressor is running at the minimum operating power value Pn and the output ratio of the quick-opening valve is FK is calculated by JT=YZJLn×JYS, that is, the temperature value is precisely adjusted and marked as JT; Based on the temperature adjustment requirements of new energy batteries, the temperature value JT is precisely adjusted so that the new energy battery is stably and accurately regulated from the cooling precise temperature control value MBJ to the test temperature target value MB; When the temperature of the new energy battery reaches the test temperature target value MB, the output ratio of the quick-opening valve is increased to balance the cooling capacity of the refrigeration compressor and the quick-opening valve with the heat dissipation of the new energy battery temperature.

6. A high and low temperature control method for a variable power new energy battery according to claim 1, characterized in that: Based on the heating signal, the steps of performing heating adjustment include: Determine whether the initial temperature belongs to the heating precise temperature control target range [MBR, MB]; If the initial temperature CT is not within the heating precise temperature control target range [MBR, MB], it enters the direct adjustment stage; If the initial temperature CT is within the heating precise temperature control target range [MBR, MB], the feedback adjustment stage is entered.

7. A high and low temperature control method for a variable power new energy battery according to claim 6, characterized in that: Entering the direct regulation stage, the temperature of the new energy battery is directly regulated; Obtain the heating temperature rise rate of the new energy battery at the time node with a unit time t during the heating process, and mark it as WSi, where i is the number of nodes, that is, the temperature rise rate at the time point after the i-th unit time t; at the same time, obtain the heating temperature value at the same time, and mark it as WTZ i; Obtain the heating temperature value WTZ of the new energy battery and the heating temperature rise rate WSi when it reaches the heating precise temperature control value MBR; Compare the heating temperature rise rate WSi with the preset heating temperature rise rate threshold WSY; If the heating temperature rise rate WSi is greater than the preset heating temperature rise rate threshold WSY, a temperature rise and fall rate signal is generated; If the heating temperature rise rate WSi is less than or equal to the preset heating temperature rise rate threshold WSY, a temperature rise rate stabilization signal is generated.

8. A high and low temperature control method for a variable power new energy battery according to claim 7, characterized in that: Based on the temperature rise and fall speed signal, the heating temperature rise and fall speed value WSJ is calculated by WSJ=WSi-WSY; that is, the temperature value per unit time t in the heating process needs to be reduced by WSJ; Based on the temperature reduction rate value JYS of new energy batteries under unit cooling capacity; Calculate and obtain the heating temperature increase / decrease speed and cooling capacity ZRJL; The heating and cooling power PZJ of the refrigeration compressor is calculated through the compression refrigeration capacity formula; That is, the new energy battery is heated at the heating temperature rise rate threshold value WSY; at the same time, the voltage value of the heating tube and the power of the compression refrigerator are reduced, and the new energy battery is kept heated at the heating temperature rise rate threshold value WSY until the temperature value of the new energy battery rises from MBR to the test temperature target value MB.

9. A high and low temperature control method for a variable power new energy battery according to claim 7, characterized in that: Based on the temperature rise rate stabilization signal, the refrigeration compressor is turned on so that the refrigeration power of the refrigeration compressor is maintained at the minimum operating power value Pn, and at the same time, the output ratio of the quick opening valve is opened to the maximum value, i.e., FKmax; The cooling capacity of the refrigeration compressor and the hedging cooling capacity are balanced. At this time, the temperature of the new energy battery is increased at the heating temperature rise rate WSi; until the temperature value of the new energy battery is increased from MBR to the test temperature target value MB; The quick-opening valve is closed to balance the heating temperature rise and cooling temperature drop of the new energy battery.

10. A variable power new energy battery high and low temperature testing device, characterized in that: The variable power new energy battery high and low temperature testing device comprises a variable power new energy battery high and low temperature control system, and the variable power new energy battery high and low temperature control system is used to execute the variable power new energy battery high and low temperature control method described in any one of claims 1-9.

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