Active heat dissipation method, device and medium in battery compartment

Abstract

The invention discloses a method, device and medium for active heat dissipation in a battery compartment, relates to the technical field of battery heat dissipation, and solves the problem that the current heat dissipation method of lithium batteries is fan heat dissipation, but there is loss in the fan heat dissipation process, and it is easy to absorb dust and difficult to clean. The method comprises the following steps: obtaining the working data of a battery pack in a battery cluster and the pH value of a coolant corresponding to the battery pack; controlling the current value flowing through a relay by temperature changes of the battery pack; realizing the opening and closing of a water pump by controlling the on-off state of the relay by a DSP chip; controlling the water pump speed of the water pump based on the water pump starting gear, and realizing active heat dissipation of a battery compartment in a battery cluster under the premise of regulating the evaporation amount of the coolant. The invention can not only ensure the safety and stability of the lithium battery and reduce the evaporation of the coolant, but also realize rapid cooling of the lithium battery and reduce the probability of failure caused by heat dissipation.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery heat dissipation, and specifically relates to a method, a device and a medium for active heat dissipation in a battery compartment. Background Art

[0002] Lithium batteries are now a common energy source driven by clean energy. They have the advantages of small size, high safety and high efficiency, but there are still various problems in their energy storage systems. The most common one is the thermal runaway problem of lithium-ion batteries. Overcharging and short circuiting will make the internal temperature of lithium-ion batteries much higher than that during normal operation. The increase in internal temperature will intensify various chemical reactions inside the battery, releasing a large amount of heat and gas. Since these heat and gases cannot be discharged in time, the internal temperature of the battery will increase sharply, thus causing thermal runaway, resulting in battery bulging, rupture, combustion and explosion.

[0003] At present, in the daily use of lithium batteries, the common heat dissipation method is to bind a fan to the outside of the battery, and achieve heat dissipation by rotating the fan to make the air outside the battery flow. The common problem with the heat dissipation method of this type of lithium battery is that heat is easily accumulated without a medium for heat conduction, and the rotation of the fan structure is prone to loss, and it is easy to absorb dust and difficult to clean.

[0004] To this end, the present invention provides a method, device and medium for active heat dissipation in a battery compartment. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide a method, device and medium for active heat dissipation in a battery compartment.

[0006] The technical problems to be solved by the present invention are:

[0007] How to achieve active heat dissipation in the battery compartment and how to prevent the coolant from evaporating and escaping during the active heat dissipation process.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A method for active heat dissipation in a battery compartment, the method comprising the following steps:

[0010] Step S1, obtaining the operating data of the battery pack in the battery cluster and the pH value of the coolant corresponding to the battery pack;

[0011] Step S2, controlling the current value flowing through the relay according to the temperature change of the battery pack;

[0012] Step S3, the DSP chip controls the on / off state of the relay to start and close the water pump;

[0013] Step S4, controlling the water pump speed of the water pump based on the water pump starting gear, and realizing active heat dissipation of the battery compartment in the battery cluster under the premise of regulating the evaporation amount of the coolant.

[0014] Furthermore, the operating data is the temperature of a single cell of a battery pack in the battery cluster.

[0015] Furthermore, the step S2 specifically includes the following steps:

[0016] Step S201, reading the single cell temperature DCi of the battery pack, where i is the number of the battery pack;

[0017] Step S202, if the temperature of the cells of all battery packs is less than or equal to the standard temperature, it is considered that the battery pack is operating normally and no operation is performed;

[0018] If the temperature of a single cell of any battery pack is greater than the standard temperature, the corresponding battery pack needs to be cooled, the number of battery packs to be cooled is increased by one, and the subsequent steps are entered;

[0019] Step S203, counting the number of battery packs to be cooled and recording it as the number of battery packs to be cooled;

[0020] If the number of battery packs to be cooled is less than or equal to the first threshold value of battery packs to be cooled, the escape level of the coolant evaporating into gas is level one, and the DSP chip controls the relay current value to become the first current value;

[0021] If the number of battery packs to be cooled is greater than the first threshold value of battery packs to be cooled and less than the second threshold value of battery packs to be cooled, the escape level of the coolant evaporating into gas is level 2 escape, and the DSP chip controls the relay current value to become the second current value;

[0022] If the number of battery packs to be cooled is greater than or equal to the second threshold value of battery packs to be cooled, the escape level of the coolant evaporating into gas is level three escape, and the DSP chip controls the relay current value to become the third current value.

[0023] Further, the first threshold value of the battery pack to be cooled is less than the second threshold value of the battery pack to be cooled;

[0024] The escape level is used to judge the ease of escape after the coolant evaporates into gas. The ease of escape at level 3 is greater than that at level 2, and the ease of escape at level 2 is greater than that at level 1.

[0025] The first current value is smaller than the second current value, and the second current value is smaller than the third current value.

[0026] Furthermore, the step S3 specifically includes the following steps:

[0027] Step S301, the DSP chip reads the current value flowing through the relay;

[0028] Step S302, if the current value flowing through the relay is the first current value, the magnetic force strength of the magnetic field in the relay is the first magnetic force; if the current value flowing through the relay is the second current value, the magnetic force strength of the magnetic field in the relay is the second magnetic force; if the current value flowing through the relay is the third current value, the magnetic force strength of the magnetic field in the relay is the third magnetic force; if the current value flowing through the relay is zero, the magnetic force strength of the magnetic field in the relay is zero;

[0029] Step S303, if the magnetic field strength of the relay is zero, the water pump is in the off state; if the magnetic field strength of the relay is the first magnetic strength, the water pump start gear is the first gear; if the magnetic field strength of the relay is the second magnetic strength, the water pump start gear is the second gear; if the magnetic field strength of the relay is the third magnetic strength, the water pump start gear is the third gear;

[0030] Among them, the third magnetic strength is greater than the second magnetic strength, the second magnetic strength is greater than the first magnetic strength, the water pump starting gear is divided into the first gear, the second gear and the third gear, the lift force of the third gear is greater than the lift force of the second gear, and the lift force of the second gear is greater than the lift force of the first gear.

[0031] Furthermore, the step S4 includes the following sub-steps:

[0032] Step S411, obtaining the water pump starting gear to start the water pump, and obtaining the corresponding water pump speed according to the shaft power, specifically:

[0033] If the water pump starting gear is the first gear, the shaft power of the water pump is the first shaft power, and the water pump speed is the first speed;

[0034] If the water pump starting gear is the second gear, the shaft power of the water pump is the second shaft power, and the water pump speed is the second speed;

[0035] If the water pump starting gear is the third gear, the shaft power of the water pump is the third shaft power, and the water pump speed is the third speed;

[0036] Step S412, the water pump works for a fixed time T according to the water pump speed, and obtains the real-time temperature LDCi and the evaporation amount of the coolant corresponding to the battery pack at the current water pump speed;

[0037] Step S413, comparing the real-time temperature with the cell temperature of the corresponding battery pack, if the real-time temperature of any battery pack is greater than or equal to the cell temperature, generating a heat dissipation invalid signal;

[0038] Step S414: If the real-time temperature of all battery packs is lower than the single cell temperature, the coolant evaporation amount is compared with the standard coolant evaporation amount. If the coolant evaporation amount is higher than the standard coolant evaporation amount, an evaporation abnormality signal is generated. If the coolant evaporation amount is lower than or equal to the standard coolant evaporation amount, the heat dissipation excellence value of the battery pack at the current water pump speed is calculated. The specific formula is as follows:

[0039] P1i=(DCi-LDCi) / DCi*100%;

[0040] P2i=(DCi-LDCi) / T*100%;

[0041] Among them, P1i is the cooling ratio, and P2i is the heat dissipation rate;

[0042] Heat dissipation excellence value = (cooling ratio × first weight coefficient + heat dissipation rate × second weight coefficient) / coolant evaporation amount;

[0043] Step S415, if the heat dissipation excellence value of the corresponding battery pack at the current water pump speed is greater than or equal to the heat dissipation excellence threshold, a heat dissipation effective signal is generated;

[0044] If the heat dissipation excellence value of the corresponding battery pack at the current water pump speed is less than the heat dissipation excellence threshold, a heat dissipation invalid signal is generated.

[0045] Furthermore, the shaft power is proportional to the pump speed;

[0046] The power of the first shaft is less than the power of the second shaft, and the power of the second shaft is less than the power of the third shaft;

[0047] The first rotation speed is lower than the second rotation speed, and the second rotation speed is lower than the third rotation speed.

[0048] Furthermore, the relationship between the coolant evaporation amount and the water pump speed is as follows:

[0049] Step S401, obtaining the cross-sectional area S of the coolant pipeline;

[0050] Step S402, calculating the coolant evaporation rate of the coolant;

[0051] Among them, the relationship between the coolant evaporation rate VZF and the single cell temperature of the battery pack is expressed as:

[0052] VZF=λ*DCi*DCi; ①;

[0053] In formula ①, λ is the evaporation coefficient;

[0054] Step S403, calculate the coolant pipeline flow rate QL and the shaft power P of the water pump per unit time,

[0055] Among them, the relationship between the coolant pipeline flow rate QL and the pipeline flow velocity VGD of the coolant pipeline is expressed as:

[0056] QL=VGD*S*t; ②;

[0057] In formula ②, t is the flow time of the coolant in the coolant pipeline;

[0058] Among them, the relationship between the coolant pipeline flow QL and the shaft power P of the water pump is expressed as:

[0059] QL=Pη / 2.73H; ③;

[0060] P = QL * 2.73H / η;

[0061] In formula ③, P is the shaft power of the water pump, η is the efficiency of the water pump, 2.73 is a constant, and H is the head force of the water pump;

[0062] The efficiency of the water pump = the effective power of the water pump / the shaft power of the water pump;

[0063] By transforming formulas ② and ③, we can get:

[0064] Pη / 2.73H=VGD*S*t;

[0065] VGD=Pη / (2.73H*S*t); ④;

[0066] From formulas ② and ④, we can see that the greater the shaft power of the water pump, the faster the water pump speed, and thus the faster the flow rate of the coolant pipeline, and the greater the coolant pipeline flow per unit time;

[0067] Step S404, the evaporation amount QZ of the coolant per unit time is calculated by formula ⑤, and the specific formula is as follows:

[0068] QZ=VZF*t; ⑤;

[0069] Step S405, calculate the coolant return flow rate QH of the coolant, and construct expressions for the coolant return flow rate, coolant pipeline flow rate, and coolant evaporation rate:

[0070] Coolant return flow = coolant pipeline flow - coolant evaporation;

[0071] That is, QH=QL-QZ; ⑥;

[0072] Through the transformation of formulas ②, ④, ⑤ and ⑥, we can get QH=VGD*S*t-λ*DC*DC*t, where QH is the coolant return flow;

[0073] It can be concluded that the faster the pipeline flow rate per unit time, the greater the reflux volume of the coolant pipeline. At the same time, due to the fast pipeline flow rate, the coolant circulates continuously, and the circulated coolant contacts the battery pack, and the temperature of the coolant is controlled. Therefore, the amount of coolant evaporation is less, and the coolant is less likely to escape when it evaporates into gas.

[0074] The present invention further provides an electronic device, comprising:

[0075] A memory storing a computer program;

[0076] The processor is communicatively connected to the memory, and when the computer program is executed by the processor, an active heat dissipation method in the battery compartment is implemented.

[0077] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, a method for active heat dissipation in a battery compartment is implemented.

[0078] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0079] The present invention first obtains the working data of the battery pack in the battery cluster and the pH value of the coolant corresponding to the battery pack, controls the current value flowing through the relay through the temperature change of the battery pack, controls the on-off state of the relay by the DSP chip to realize the opening and closing of the water pump, controls the water pump speed of the water pump based on the water pump starting gear, and realizes active heat dissipation of the battery compartment in the battery cluster under the premise of regulating the evaporation amount of the coolant. The present invention can not only ensure the safety and stability of the lithium battery and reduce the evaporation of the coolant, but also realize the rapid cooling of the lithium battery and reduce the probability of failure caused by heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0081] Figure 1 The following is a flowchart of the active heat dissipation method in the battery compartment of the present invention;

[0082] Figure 2 It is a schematic diagram of the battery cluster liquid cooling system in the present invention;

[0083] Figure 3 This is a block diagram of the temperature control circuit in the present invention;

[0084] Figure 4 It is a schematic diagram of the structure of the electronic device in the present invention. DETAILED DESCRIPTION

[0085] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0086] Example 1: Please refer to Figure 1-Figure 3 As shown, the technical solution provided by the present invention is: an active heat dissipation method in a battery compartment, an active heat dissipation device for a battery cluster in the battery compartment, the active heat dissipation device comprising a battery cluster and a liquid dispensing head, a water pump, a sleeve evaporator and a pipeline of the battery cluster, wherein the water pump is turned on or off by a DSP chip controlling a relay, the liquid dispensing head is used for coolant to enter or flow out of the battery cluster, one side of the liquid dispensing head is connected to the water pump through a coolant pipeline, and the other side of the liquid dispensing head is connected to the sleeve evaporator through a coolant pipeline, the sleeve evaporator is used to cool the coolant, the water pump drives the coolant to enter the battery cluster from the liquid dispensing head below the battery cluster through the coolant pipeline, and cools each battery pack in the battery cluster, and the cooled coolant is collected from the liquid dispensing head above the battery cluster in the coolant pipeline and then enters the sleeve evaporator again for cooling, the method comprises the following steps:

[0087] Step S1, obtaining the operating data of the battery pack in the battery cluster and the pH value of the coolant corresponding to the battery pack;

[0088] It should be specifically noted that the working data is the single cell temperature of the battery pack in the battery cluster. The battery cluster is composed of multiple battery packs. The single cell temperature of each battery pack is obtained through a temperature sensor, and the pH value of the coolant is obtained through a pH sensor.

[0089] Step S2, controlling the current value flowing through the relay according to the temperature change of the battery pack;

[0090] The step S2 specifically includes the following steps:

[0091] Step S201, reading the single cell temperature DCi of the battery pack, where i is the number of the battery pack;

[0092] Step S202, if the monomer temperature of all battery packs is less than or equal to the standard temperature, it is considered that the battery pack is working normally and no operation is performed; if the monomer temperature of any battery pack is greater than the standard temperature, the corresponding battery pack needs to be cooled, the number of battery packs to be cooled is increased by one, and the process proceeds to the subsequent steps;

[0093] Step S203, counting the number of battery packs to be cooled and recording it as the number of battery packs to be cooled;

[0094] If the number of battery packs to be cooled is less than or equal to the first threshold value of battery packs to be cooled, the escape level of the coolant evaporating into gas is level one, and the DSP chip controls the relay current value to become the first current value;

[0095] If the number of battery packs to be cooled is greater than the first threshold value of battery packs to be cooled and less than the second threshold value of battery packs to be cooled, the escape level of the coolant evaporating into gas is level 2 escape, and the DSP chip controls the relay current value to become the second current value;

[0096] If the number of battery packs to be cooled is greater than or equal to the second threshold value of battery packs to be cooled, the escape level of the coolant evaporating into gas is level three, and the DSP chip controls the relay current value to become the third current value;

[0097] It should be specifically stated that the threshold of the first battery pack to be cooled is lower than the threshold of the second battery pack to be cooled, escape may occur during the process of evaporation of the coolant into a gaseous state, and the escape level of the coolant evaporating into a gaseous state is used to judge the ease of escape after the coolant evaporates into a gaseous state, the ease of escape of the third level is greater than the ease of escape of the second level, the ease of escape of the second level is greater than the ease of escape of the first level, the first current value is less than the second current value, and the second current value is less than the third current value;

[0098] Step S3, the DSP chip controls the on / off state of the relay to start and close the water pump;

[0099] It should be specifically explained that the water pump is connected with a DSP chip and a relay. The relay is an electromagnetic switch that controls the electromagnetic switch according to the size of the current. The relay is usually composed of four parts: a coil, an iron core, a contact and a shell. When the external power supply is connected to the coil, a magnetic field will be generated in the coil. This magnetic field will magnetize the iron sheet on the iron core and attract the iron core. When the iron core is attracted, the spring on the contact is pulled to close or open the contact; when the external power supply is disconnected or the current of the external circuit is lower than the threshold, the current in the coil disappears or decreases, the magnetic field disappears or weakens, the iron core returns to its original state, and the contact also returns to its original state;

[0100] The step S3 specifically includes the following steps:

[0101] Step S301, the DSP chip reads the current value flowing through the relay;

[0102] Step S302, if the current value flowing through the relay is the first current value, the magnetic field strength in the relay is the first magnetic strength;

[0103] If the current value flowing through the relay is the second current value, the magnetic force of the magnetic field in the relay is the second magnetic strength;

[0104] If the current value flowing through the relay is the third current value, the magnetic field strength in the relay is the third magnetic strength;

[0105] If the current flowing through the relay is zero, the magnetic field strength inside the relay is zero;

[0106] It should be specifically stated that the third magnetic strength is greater than the second magnetic strength, and the second magnetic strength is greater than the first magnetic strength. The greater the magnetic strength of the magnetic field in the relay, the greater the ability of the relay to adsorb the iron core. In this example, the water pump start gear is divided into the first gear, the second gear and the third gear. The water pump start gear indicates the state of the water pump starting. The lift force of the third gear is greater than the lift force of the second gear, and the lift force of the second gear is greater than the lift force of the first gear.

[0107] Step S303, if the magnetic field strength in the relay is zero, the water pump is in the off state;

[0108] If the magnetic field strength in the relay is the first magnetic strength, the water pump start gear is the first gear;

[0109] If the magnetic field strength in the relay is the second magnetic strength, the water pump start gear is the second gear;

[0110] If the magnetic field strength in the relay is the third magnetic strength, the water pump start gear is the third gear;

[0111] Step S4, controlling the water pump speed of the water pump based on the water pump starting gear position, and realizing active heat dissipation of the battery compartment in the battery cluster under the premise of regulating the evaporation amount of the coolant;

[0112] In this embodiment, the relationship between the cooling liquid evaporation amount and the water pump speed in step S4 is as follows:

[0113] Step S401, obtaining the cross-sectional area S of the coolant pipeline;

[0114] Step S402, calculating the coolant evaporation rate of the coolant;

[0115] Among them, the relationship between the coolant evaporation rate VZF and the single cell temperature of the battery pack is expressed as:

[0116] VZF=λ*DCi*DCi; ①;

[0117] Wherein, λ is the evaporation coefficient, which is related to the contact area between the battery pack and the coolant and the temperature of the coolant;

[0118] Step S403, calculate the coolant pipeline flow rate QL and the shaft power P of the water pump per unit time,

[0119] Among them, the relationship between the coolant pipeline flow rate QL and the pipeline flow velocity VGD of the coolant pipeline is expressed as:

[0120] QL=VGD*S*t; ②;

[0121] In ②, t is the flow time of the coolant in the coolant pipeline;

[0122] Among them, the relationship between the coolant pipeline flow QL and the shaft power P of the water pump is expressed as:

[0123] QL=Pη / 2.73H; ③;

[0124] P = QL * 2.73H / η;

[0125] Among them, P is the shaft power of the water pump, in KW, η is the efficiency of the water pump, in %, 2.73 is a constant, and H is the head force of the water pump, in m; the shaft power of the water pump (kW) P = flow rate (water delivery volume of the water pump) × head force × 9.81 × medium specific gravity / efficiency of the water pump;

[0126] The efficiency of the water pump = the effective power of the water pump / the shaft power of the water pump;

[0127] By transforming formulas ② and ③, we can get:

[0128] Pη / 2.73H=VGD*S*t;

[0129] VGD=Pη / (2.73H*S*t); ④;

[0130] Furthermore, from formulas ② and ④, it can be concluded that the greater the shaft power of the water pump, the faster the water pump speed, and thus the faster the flow rate of the coolant pipeline, and the greater the coolant pipeline flow per unit time;

[0131] Step S404, the evaporation amount QZ of the coolant per unit time is calculated by a formula, and the formula is as follows:

[0132] QZ=VZF*t; ⑤;

[0133] Step S405, calculate the coolant return flow rate QH of the coolant, and construct expressions for the coolant return flow rate, coolant pipeline flow rate, and coolant evaporation rate:

[0134] Coolant return flow = coolant pipeline flow - coolant evaporation;

[0135] That is, QH=QL-QZ; ⑥;

[0136] Through the transformation of formulas ②, ④, ⑤ and ⑥, we can get QH=VGD*S*t-λ*DC*DC*t, where QH is the coolant return flow;

[0137] It is thus obtained that the faster the pipeline flow rate per unit time, the greater the coolant pipeline reflux volume. At the same time, due to the fast pipeline flow rate, the coolant circulates continuously, and the circulated coolant contacts the battery pack, and the coolant temperature is controlled. Therefore, the coolant evaporates less, and the coolant evaporates into gaseous state and is less likely to escape.

[0138] In this embodiment, step S4 includes the following sub-steps:

[0139] Step S411, obtaining the water pump starting gear to start the water pump, and obtaining the corresponding water pump speed according to the shaft power, specifically:

[0140] If the water pump starting gear is the first gear, the shaft power of the water pump is the first shaft power, and the water pump speed is the first speed;

[0141] If the water pump starting gear is the second gear, the shaft power of the water pump is the second shaft power, and the water pump speed is the second speed;

[0142] If the water pump starting gear is the third gear, the shaft power of the water pump is the third shaft power, and the water pump speed is the third speed; wherein the shaft power is proportional to the water pump speed, the first shaft power is less than the second shaft power, the second shaft power is less than the third shaft power, the first speed is less than the second speed, and the second speed is less than the third speed;

[0143] Step S412, the water pump works for a fixed time T according to the water pump speed, and obtains the real-time temperature LDCi and the coolant evaporation amount of the corresponding battery pack at the current water pump speed, where T is a positive integer;

[0144] Step S413, comparing the real-time temperature with the cell temperature of the corresponding battery pack, if the real-time temperature of any battery pack is greater than or equal to the cell temperature, generating a heat dissipation invalid signal;

[0145] Step S414: If the real-time temperature of all battery packs is less than the single cell temperature, the coolant evaporation amount is compared with the standard coolant evaporation amount. If the coolant evaporation amount is greater than the standard coolant evaporation amount, an evaporation abnormality signal is generated. If the coolant evaporation amount is less than or equal to the standard coolant evaporation amount, the heat dissipation excellence value of the battery pack at the current water pump speed is calculated after removing the dimension. The specific formula is as follows:

[0146] P1i=(DCi-LDCi) / DCi*100%;

[0147] P2i=(DCi-LDCi) / T*100%;

[0148] Among them, P1i is the cooling ratio, and P2i is the heat dissipation rate;

[0149] Heat dissipation excellence value = (cooling ratio × first weight coefficient + heat dissipation rate × second weight coefficient) / coolant evaporation amount; wherein, the first weight coefficient is greater than the second weight coefficient, and the weight coefficient gives corresponding weights to the cooling ratio and heat dissipation rate battery pack for calculating the heat dissipation excellence value of the battery pack, that is, the cooling ratio and heat dissipation rate also affect the heat dissipation excellence of the battery pack, avoiding judging the heat dissipation excellence of the battery pack by a single parameter, and the weight coefficient can be obtained based on multiple test data;

[0150] Step S415, if the heat dissipation excellence value of the corresponding battery pack at the current water pump speed is greater than or equal to the heat dissipation excellence threshold, a heat dissipation effective signal is generated;

[0151] If the heat dissipation excellence value of the corresponding battery pack at the current water pump speed is less than the heat dissipation excellence threshold, a heat dissipation invalid signal is generated.

[0152] Embodiment 2: Different from Embodiment 1, the present invention further provides an active heat dissipation method in a battery compartment, which is used to monitor and control the pH value of the coolant in the battery cluster, thereby increasing the use time of the coolant;

[0153] In this embodiment, the method includes the following steps:

[0154] Step T1, reading the pH value of the coolant;

[0155] Step T2, if the pH value of the coolant is less than or equal to the first pH threshold, the coolant is considered to be acidic and corrosive;

[0156] If the pH value of the coolant is greater than the first pH threshold and less than the second pH threshold, the coolant is in a normal state;

[0157] If the pH value of the coolant is greater than or equal to the second pH threshold, the coolant is considered to be alkaline corrosive; wherein the second pH threshold is greater than 7 and the first pH threshold is less than 7;

[0158] Step T3, if the coolant is acidic and corrosive, add a proper amount of alkaline regulator to the coolant; if the coolant is alkaline and corrosive, add a proper amount of acidic regulator to the coolant.

[0159] In this application, if corresponding calculation formulas appear, the above calculation formulas are all dimensionless and take their numerical calculations. The weight coefficients, proportional coefficients and other coefficients in the formulas are set to a result value obtained by quantifying each parameter. The size of the weight coefficient and the proportional coefficient can be determined as long as it does not affect the proportional relationship between the parameter and the result value.

[0160] Embodiment three: Figure 4 An example of a structural diagram of an electronic device is shown in FIG. Figure 4As shown, the electronic device may include: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus. The processor can call the logic instructions in the memory to execute an active heat dissipation method in the battery compartment, the method comprising: obtaining the working data of the battery pack in the battery cluster and the pH value of the coolant corresponding to the battery pack, controlling the current value flowing through the relay by the temperature change of the battery pack, the DSP chip controlling the on-off state of the relay to realize the opening and closing of the water pump, and controlling the water pump speed of the water pump based on the water pump starting gear, so as to realize the active heat dissipation of the battery compartment in the battery cluster under the premise of regulating the evaporation amount of the coolant; at the same time, reading the pH value of the coolant, if the pH value of the coolant is less than or equal to the first pH threshold, the coolant is acidic and corrosive, then adding an appropriate amount of alkaline regulator to the coolant, if the pH value of the coolant is greater than or equal to the second pH threshold, it is considered that the coolant is alkaline and corrosive, then adding an appropriate amount of acid regulator to the coolant, if the pH value of the coolant is greater than the first pH threshold and less than the second pH threshold, then the coolant is in a normal state and no operation is performed.

[0161] In addition, the logic instructions in the above-mentioned memory can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0162] Embodiment 4: On the other hand, the present application also provides a computer program product, the computer program product includes a computer program stored on a computer-readable storage medium, the computer program includes program instructions, when the program instructions are executed by the computer, the computer can execute a method for active heat dissipation in a battery compartment provided by the above methods, the method comprising: obtaining the working data of the battery pack in the battery cluster and the pH value of the coolant corresponding to the battery pack, controlling the current value flowing through the relay through the temperature change of the battery pack, controlling the on-off state of the relay by the DSP chip to realize the start and close of the water pump, and starting the water pump based on the pH value of the coolant corresponding to the battery pack. The dynamic gear controls the speed of the water pump to achieve active heat dissipation of the battery compartment in the battery cluster under the premise of regulating the evaporation amount of the coolant; at the same time, read the pH value of the coolant. If the pH value of the coolant is less than or equal to the first pH threshold, the coolant is acidic and corrosive, and an appropriate amount of alkaline regulator is added to the coolant. If the pH value of the coolant is greater than or equal to the second pH threshold, it is considered that the coolant is alkaline and corrosive, and an appropriate amount of acidic regulator is added to the coolant. If the pH value of the coolant is greater than the first pH threshold and less than the second pH threshold, the coolant is in a normal state and no operation is performed.

[0163] Embodiment 5: On the other hand, the present application also provides a computer-readable storage medium having a computer program stored thereon, which is implemented by a processor to execute the above-mentioned method for active heat dissipation in a battery compartment, the method comprising: obtaining working data of a battery pack in a battery cluster and a pH value of a coolant corresponding to the battery pack, controlling a current value flowing through a relay by temperature changes of the battery pack, controlling the on-off state of a relay by a DSP chip to start and close a water pump, controlling a water pump speed of the water pump based on a water pump starting gear, and realizing active heat dissipation of a battery compartment in a battery cluster under the premise of regulating the amount of evaporation of the coolant; at the same time, reading the pH value of the coolant, if the pH value of the coolant is less than or equal to a first pH threshold, the coolant is acidic and corrosive, then adding an appropriate amount of alkaline regulator to the coolant, if the pH value of the coolant is greater than or equal to a second pH threshold, it is considered that the coolant is alkaline and corrosive, then adding an appropriate amount of acid regulator to the coolant, if the pH value of the coolant is greater than the first pH threshold and less than the second pH threshold, then the coolant is in a normal state and no operation is performed.

[0164] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0165] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0166] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for active heat dissipation in a battery compartment, characterized in that: The method comprises the following steps: Step S1, obtaining working data of a battery pack in a battery cluster and a pH value of a coolant corresponding to the battery pack; wherein the working data is a single cell temperature of a battery pack in the battery cluster; Step S2, controlling the current value flowing through the relay according to the temperature change of the battery pack; Wherein, the step S2 specifically includes the following steps: Step S201, reading the single cell temperature DCi of the battery pack, where i is the number of the battery pack; Step S202, if the temperature of the cells of all battery packs is less than or equal to the standard temperature, it is considered that the battery pack is operating normally and no operation is performed; If the temperature of a single cell of any battery pack is greater than the standard temperature, the corresponding battery pack needs to be cooled, the number of battery packs to be cooled is increased by one, and the subsequent steps are entered; Step S203, counting the number of battery packs to be cooled and recording it as the number of battery packs to be cooled; If the number of battery packs to be cooled is less than or equal to the first threshold value of battery packs to be cooled, the escape level of the coolant evaporating into gas is level one, and the DSP chip controls the relay current value to become the first current value; If the number of battery packs to be cooled is greater than the first threshold value of battery packs to be cooled and less than the second threshold value of battery packs to be cooled, the escape level of the coolant evaporating into gas is level 2 escape, and the DSP chip controls the relay current value to become the second current value; If the number of battery packs to be cooled is greater than or equal to the second threshold value of battery packs to be cooled, the escape level of the coolant evaporating into gas is level three, and the DSP chip controls the relay current value to become the third current value; Step S3, the DSP chip controls the on / off state of the relay to start and close the water pump; Wherein, the step S3 specifically includes the following steps: Step S301, the DSP chip reads the current value flowing through the relay; Step S302, if the current value flowing through the relay is the first current value, the magnetic force strength of the magnetic field in the relay is the first magnetic force; if the current value flowing through the relay is the second current value, the magnetic force strength of the magnetic field in the relay is the second magnetic force; if the current value flowing through the relay is the third current value, the magnetic force strength of the magnetic field in the relay is the third magnetic force; if the current value flowing through the relay is zero, the magnetic force strength of the magnetic field in the relay is zero; Step S303, if the magnetic field strength of the relay is zero, the water pump is in the off state; if the magnetic field strength of the relay is the first magnetic strength, the water pump start gear is the first gear; if the magnetic field strength of the relay is the second magnetic strength, the water pump start gear is the second gear; if the magnetic field strength of the relay is the third magnetic strength, the water pump start gear is the third gear; The third magnetic strength is greater than the second magnetic strength, the second magnetic strength is greater than the first magnetic strength, the water pump starting gear is divided into a first gear, a second gear and a third gear, the lift force of the third gear is greater than the lift force of the second gear, and the lift force of the second gear is greater than the lift force of the first gear; Step S4, controlling the water pump speed of the water pump based on the water pump starting gear position, and realizing active heat dissipation of the battery compartment in the battery cluster under the premise of regulating the evaporation amount of the coolant; Wherein, the step S4 includes the following sub-steps: Step S411, obtaining the water pump starting gear to start the water pump, and obtaining the corresponding water pump speed according to the shaft power, specifically: If the water pump starting gear is the first gear, the shaft power of the water pump is the first shaft power, and the water pump speed is the first speed; If the water pump starting gear is the second gear, the shaft power of the water pump is the second shaft power, and the water pump speed is the second speed; If the water pump starting gear is the third gear, the shaft power of the water pump is the third shaft power, and the water pump speed is the third speed; Step S412, the water pump works for a fixed time T according to the water pump speed, and obtains the real-time temperature LDCi and the evaporation amount of the coolant corresponding to the battery pack at the current water pump speed; Step S413, comparing the real-time temperature with the cell temperature of the corresponding battery pack, if the real-time temperature of any battery pack is greater than or equal to the cell temperature, generating a heat dissipation invalid signal; Step S414: If the real-time temperature of all battery packs is lower than the single cell temperature, the coolant evaporation amount is compared with the standard coolant evaporation amount. When the coolant evaporation amount is higher than the standard coolant evaporation amount, an evaporation abnormality signal is generated. When the coolant evaporation amount is lower than or equal to the standard coolant evaporation amount, the heat dissipation excellence value of the battery pack at the current water pump speed is calculated. The specific formula is as follows: P1i=(DCi-LDCi) / DCi*100%; P2i=(DCi-LDCi) / T*100%; Among them, P1i is the cooling ratio, and P2i is the heat dissipation rate; Heat dissipation excellence value = (cooling ratio × first weight coefficient + heat dissipation rate × second weight coefficient) / coolant evaporation amount; Step S415, if the heat dissipation excellence value of the corresponding battery pack at the current water pump speed is greater than or equal to the heat dissipation excellence threshold, a heat dissipation effective signal is generated; If the heat dissipation excellence value of the corresponding battery pack at the current water pump speed is less than the heat dissipation excellence threshold, a heat dissipation invalid signal is generated.

2. The method for active heat dissipation in a battery compartment according to claim 1, characterized in that: The first battery pack threshold to be cooled is less than the second battery pack threshold to be cooled; The escape level is used to judge the ease of escape after the coolant evaporates into gas. The ease of escape at level 3 is greater than that at level 2, and the ease of escape at level 2 is greater than that at level 1. The first current value is smaller than the second current value, and the second current value is smaller than the third current value.

3. The method for active heat dissipation in a battery compartment according to claim 1, characterized in that: The shaft power is proportional to the pump speed; The power of the first shaft is less than the power of the second shaft, and the power of the second shaft is less than the power of the third shaft; The first rotation speed is lower than the second rotation speed, and the second rotation speed is lower than the third rotation speed.

4. The method for active heat dissipation in a battery compartment according to claim 1, characterized in that: The relationship between coolant evaporation and water pump speed is as follows: Step S401, obtaining the cross-sectional area S of the coolant pipeline; Step S402, calculating the coolant evaporation rate of the coolant; Among them, the relationship between the coolant evaporation rate VZF and the single cell temperature of the battery pack is expressed as: VZF=λ*DCi*DCi;①; In formula ①, λ is the evaporation coefficient; Step S403, calculate the coolant pipeline flow rate QL and the shaft power P of the water pump per unit time, Among them, the relationship between the coolant pipeline flow rate QL and the pipeline flow velocity VGD of the coolant pipeline is expressed as: QL=VGD*S*t;②; In formula ②, t is the flow time of the coolant in the coolant pipeline; Among them, the relationship between the coolant pipeline flow QL and the shaft power P of the water pump is expressed as: QL=Pη / 2.73H;③; P = QL * 2.73H / η; In formula ③, P is the shaft power of the water pump, η is the efficiency of the water pump, 2.73 is a constant, and H is the head force of the water pump; The efficiency of the water pump = the effective power of the water pump / the shaft power of the water pump; By transforming formulas ② and ③, we can get: Pη / 2.73H=VGD*S*t; VGD=Pη / (2.73H*S*t); ④; From formulas ② and ④, we can see that the greater the shaft power of the water pump, the faster the water pump speed, and thus the faster the flow rate of the coolant pipeline, and the greater the coolant pipeline flow per unit time; Step S404, the evaporation amount QZ of the coolant per unit time is calculated by formula ⑤, and the specific formula is as follows: QZ=VZF*t;⑤; Step S405, calculate the coolant return flow rate QH of the coolant, and construct expressions for the coolant return flow rate, coolant pipeline flow rate, and coolant evaporation rate: Coolant return flow = coolant pipeline flow - coolant evaporation; That is, QH = QL - QZ; ⑥; By transforming formulas ②, ④, ⑤ and ⑥, we can obtain QH=VGD*S*t-λ*DC*DC*t, where QH is the coolant reflux rate.

5. An electronic device, characterized in that: The electronic device comprises: A memory storing a computer program; A processor is communicatively connected to the memory, and when the computer program is executed by the processor, the method described in any one of claims 1 to 4 is implemented.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method described in any one of claims 1 to 4 is implemented.

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