Lithium battery thermal management method and device based on battery bidirectional temperature control device, computer equipment and storage medium

Abstract

The invention provides a lithium battery thermal management method and device based on a battery bidirectional temperature control device, computer equipment and a storage medium. According to the lithium battery thermal management method based on the battery two-way temperature control device, the battery two-way temperature control device used for conducting two-way temperature adjustment on a lithium battery is included, and the battery two-way temperature control device comprises a battery cell set, a temperature equalizing assembly, a semiconductor thermoelectric refrigeration array set, a temperature sensor array set and a battery manager. The temperature sensor array group is used for acquiring the temperature of each partition in the battery cell group; the lithium battery module based on uniform temperature management can execute the following steps: acquiring the battery cell partition temperature of the battery cell group; detecting whether the cell partition temperature is matched with a preset partition temperature or not; and when the cell partition temperature is matched with the preset partition temperature, the battery manager sends a constant-temperature low-power signal to the semiconductor thermoelectric refrigeration array group, so that the corresponding module of the semiconductor thermoelectric refrigeration array group runs at low power consumption or intermittently.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of lithium batteries, in particular to a lithium battery thermal management method and device based on a bidirectional battery temperature control device, a computer device and a storage medium. BACKGROUND

[0002] With the rapid development of lithium battery technology, lithium batteries are mostly used for power supply in various electronic devices such as robots, energy storage and emergency power supplies. However, due to the different working environments of these electronic devices, the working environments of lithium batteries are also different, and thus the temperatures in the working environments of lithium batteries also differ. When lithium batteries are in a high-temperature environment, and when lithium batteries are subjected to high-power charging and discharging, the internal resistance of lithium batteries will generate a large amount of Joule heat, causing the internal temperature of lithium batteries to rise, which easily leads to the risk of thermal runaway. When lithium batteries are in a low-temperature environment, the internal temperature of lithium batteries also decreases, causing the activity of lithium ions in lithium batteries to decrease, which reduces the migration speed of lithium ions in lithium batteries and reduces the output power of lithium batteries during work, affecting the working efficiency of lithium batteries. Therefore, the thermal management technology of lithium batteries needs to properly regulate the temperature in lithium batteries to ensure the safety of lithium batteries and avoid affecting the working efficiency of lithium batteries.

[0003] However, the existing lithium battery thermal management technology has significant deficiencies. The existing lithium battery thermal management system usually controls the temperature of the battery pack as a whole, and cannot accurately regulate the temperature of each battery cell or partition inside, which leads to uneven temperature between battery cells and easily produces local hot spots, accelerating the overall efficiency decay of the battery cell group. At the same time, the lithium battery thermal management system has slow response speed and cannot adjust the dynamic changes of the battery cell temperature during the charging and discharging process, which has a lag problem. In addition, the existing lithium battery thermal management system uses a complex and heavy heat dissipation structure of air cooling and liquid cooling, which reduces the portability of lithium batteries. In scenarios that require both heating and cooling functions, two independent lithium battery thermal management systems with heat dissipation and heating functions are usually integrated, further increasing the complexity and cost of the lithium battery structure. SUMMARY

[0004] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a lithium battery thermal management method and device based on a bidirectional battery temperature control device, a computer device and a storage medium, which has a simple structure, fast temperature regulation speed and both heat dissipation and heating functions, and can accurately and dynamically regulate the temperature of lithium batteries.

[0005] The purpose of the present disclosure is achieved by the following technical solutions: A lithium battery thermal management method based on a battery bidirectional temperature control device, the battery bidirectional temperature control device is used for bidirectional temperature regulation of the lithium battery, and the battery bidirectional temperature control device comprises: a cell group, a uniform temperature assembly, a semiconductor thermoelectric refrigeration array group, a temperature sensor array group and a battery manager, the cell group comprises a plurality of cells, the semiconductor thermoelectric refrigeration array group is arranged in the cell group and in contact with the cells, each module of the semiconductor thermoelectric refrigeration array group corresponds to a subzone in the cell group, and the uniform temperature assembly is located between the semiconductor thermoelectric refrigeration array group and the cells; the temperature sensor array group is arranged correspondingly with the semiconductor thermoelectric refrigeration array group, the temperature sensor array group is used for collecting the temperature of each subzone in the cell group, the output end of the temperature sensor array group is connected with the sampling end of the battery manager, and the bidirectional temperature control end of the battery manager is connected with the controlled end of the semiconductor thermoelectric refrigeration array group; the lithium battery module based on the uniform temperature management can perform the following steps: acquiring the cell subzone temperature of the cell group; detecting whether the cell subzone temperature matches the preset subzone temperature; when the cell subzone temperature matches the preset subzone temperature, the battery manager sends a constant-temperature low-power signal to the semiconductor thermoelectric refrigeration array group, so that the corresponding module of the semiconductor thermoelectric refrigeration array group runs through low-power consumption or intermittently.

[0006] In one embodiment, detecting whether the cell subzone temperature matches the preset subzone temperature specifically comprises the following steps: detecting whether the cell subzone temperature is located in the preset subzone temperature interval.

[0007] In one embodiment, when the cell subzone temperature matches the preset subzone temperature, the battery manager sends a constant-temperature low-power signal to the semiconductor thermoelectric refrigeration array group, so that the corresponding module of the semiconductor thermoelectric refrigeration array group runs through low-power consumption or intermittently, specifically comprising the following steps: if the cell subzone temperature is located in the preset subzone temperature interval, the semiconductor thermoelectric refrigeration array group is switched to a constant-temperature mode to keep the cell warm.

[0008] In one embodiment, when the cell subzone temperature matches the preset subzone temperature, the battery manager sends a constant-temperature low-power signal to the semiconductor thermoelectric refrigeration array group, so that the corresponding module of the semiconductor thermoelectric refrigeration array group runs through low-power consumption or intermittently, specifically further comprising the following steps: if the cell subzone temperature is outside the preset subzone temperature interval, it is detected whether the cell subzone temperature is greater than the upper limit value of the preset subzone temperature interval; if the cell subzone temperature is greater than the upper limit value of the preset subzone temperature interval, the semiconductor thermoelectric refrigeration array group is switched to a heat dissipation mode to dissipate heat for the cell.

[0009] In one of the embodiments, after the semiconductor thermoelectric refrigeration array group is switched to the heat dissipation mode, the following step is further included: when the state of charge of the battery cell group is in a first preset range value, and / or the first correction coefficient of the charge and discharge rate of the battery cell group is greater than 0, the output power of the semiconductor thermoelectric refrigeration array group in the heat dissipation mode is increased.

[0010] In one of the embodiments, if the battery cell partition temperature is out of the preset partition temperature interval, after detecting whether the battery cell partition temperature is greater than the upper limit value of the preset partition temperature interval, the specific steps include: If the battery cell partition temperature is less than the lower limit value of the preset partition temperature interval, the semiconductor thermoelectric refrigeration array group is switched to the heating mode to heat the battery cell.

[0011] In one of the embodiments, after the semiconductor thermoelectric refrigeration array group is switched to the heating mode, the following step is further included: when the state of charge of the battery cell group is in a first preset range value, and / or the second correction coefficient of the charge and discharge rate of the battery cell group is less than 0, the output power of the semiconductor thermoelectric refrigeration array group in the heating mode is increased.

[0012] A lithium battery thermal management device based on a battery bidirectional temperature control device, characterized in that it comprises: a temperature acquisition module, which is used to acquire the battery cell partition temperature of a battery cell group; a detection module, which is used to detect whether the battery cell partition temperature matches a preset partition temperature; a signal output module, which is used to send a constant-temperature low-power signal to a battery manager to make corresponding modules of the semiconductor thermoelectric refrigeration array group run through low-power consumption or intermittently when the battery cell partition temperature matches the preset partition temperature.

[0013] A computer device comprising a memory and a processor, wherein the memory stores a computer program, and wherein the processor implements the steps of any one of the methods in the lithium battery thermal management method based on the battery bidirectional temperature control device in the above embodiments when executing the computer program.

[0014] A storage medium having a computer program stored thereon, wherein the computer program implements the steps of any one of the methods in the lithium battery thermal management method based on the battery bidirectional temperature control device in the above embodiments when executed by a processor.

[0015] Compared with the prior art, the present disclosure has at least the following advantages: The lithium battery thermal management method based on the bidirectional temperature control device of the battery can control the semiconductor thermoelectric refrigeration array group to perform temperature control on the corresponding cell subarea according to the temperature of the cell subarea, dynamically regulate the temperature of the cell in the subarea, and keep the cell group in the preset subarea temperature. Therefore, the internal temperature of the cell group is kept balanced, the local hot spot problem caused by different temperatures between each cell in the cell group is reduced, and the service life of the cell group is prolonged. Compared with the prior art, the semiconductor thermoelectric refrigeration array group used in the lithium battery thermal management method based on the bidirectional temperature control device of the battery is combined with the temperature equalizing component on the surface of the lithium battery, and the Peltier effect generated after the semiconductor thermoelectric refrigeration array group is powered on can directly refrigerate or heat the cell, so that the effect of regulating the temperature of the cell is achieved. The structure of the semiconductor thermoelectric refrigeration array group is simple, the quality is small, and the portability is improved. At the same time, the semiconductor thermoelectric refrigeration array group is not affected by the heat capacity characteristics of itself, and the response and adjustment speed is fast, so that the temperature of the cell can be dynamically adjusted in time. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0017] Figure 1 The flowchart of the execution steps of the lithium battery module based on the temperature equalizing management according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the related drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thorough and comprehensive.

[0019] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of the disclosure herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0021] In order to better understand the technical solutions and beneficial effects of the disclosure, the disclosure will be further described in detail below in combination with specific embodiments: The disclosure provides a lithium battery thermal management method based on a battery bidirectional temperature control device. The battery bidirectional temperature control device is used for bidirectional temperature regulation of the lithium battery. The battery bidirectional temperature control device comprises a cell group, a uniform temperature assembly, a semiconductor thermoelectric refrigeration array group, a temperature sensor array group, and a battery manager. The cell group comprises a plurality of cells. The semiconductor thermoelectric refrigeration array group is arranged in the cell group and in contact with the cells. Each module of the semiconductor thermoelectric refrigeration array group corresponds to a subzone in the cell group. The uniform temperature assembly is located between the semiconductor thermoelectric refrigeration array group and the cells. The temperature sensor array group is arranged correspondingly to the semiconductor thermoelectric refrigeration array group. The temperature sensor array group is used for collecting the temperature of each subzone in the cell group. The output end of the temperature sensor array group is connected to the sampling end of the battery manager. The bidirectional temperature control end of the battery manager is connected to the controlled end of the semiconductor thermoelectric refrigeration array group.

[0022] It should be noted that the uniform temperature assembly comprises a uniform temperature layer, a substrate, and a filling layer which are arranged in sequence. The uniform temperature layer is arranged on the first surface of the substrate. The filling layer is arranged on the second surface of the substrate. The filling layer is also in contact with the first surface of the plurality of cells of the cell group. The semiconductor thermoelectric refrigeration array group is arranged on the surface of the uniform temperature layer away from the substrate. The filling layer fills the recesses and protrusions on the surface of the cells, so that the surface of each cell is in closer contact with the uniform temperature assembly. Therefore, the heat of the cell subzone is better transferred to the semiconductor thermoelectric refrigeration array group. Meanwhile, the semiconductor thermoelectric refrigeration array group better controls the temperature of each subzone in the cell group through each module of the uniform temperature layer.

[0023] Please refer to Figure 1 The lithium battery thermal management method based on the battery bidirectional temperature control device comprises part or all of the following steps: S100, acquiring the cell subzone temperature of the cell group; In the embodiment, the temperature sensor array group collects the cell subarea temperature of the plurality of cells in the cell group, and the temperature sensor converts the collected cell subarea temperature into an electric signal, and the output end of the temperature sensor transmits the electric signal to the sampling end of the battery manager. It should be noted that the preset subarea temperature is an interval value [Tmin, Tmax], wherein Tmin is the preset subarea temperature minimum value, and Tmax is the preset subarea temperature maximum value. In the embodiment, Tmin is 15°C, and Tmax is 25°C.

[0024] S200, detecting whether the cell subarea temperature matches the preset subarea temperature. In the embodiment, after the sampling end of the battery manager receives the electric signal, the battery manager compares the electric signal with the preset subarea temperature inside the battery manager to determine whether the cell subarea temperature in the plurality of cells is within the preset subarea temperature.

[0025] S300, when the cell subarea temperature matches the preset subarea temperature, the battery manager sends a constant-temperature low-power signal to the semiconductor thermoelectric refrigeration array group, so that the corresponding module of the semiconductor thermoelectric refrigeration array group operates at low power or intermittently.

[0026] In the embodiment, when the cell subarea temperature is within the preset subarea temperature, the constant-temperature low-power signal is sent from the bidirectional temperature control end of the battery manager to the controlled end of the semiconductor thermoelectric refrigeration array group, and the semiconductor thermoelectric refrigeration array group operates at low power or intermittently, so that the module in the semiconductor thermoelectric refrigeration array group can keep the constant temperature of the subarea in the cell group.

[0027] The above-mentioned lithium battery thermal management method based on the battery bidirectional temperature control device determines whether each cell subarea temperature matches the preset subarea temperature set inside the battery manager after obtaining the plurality of cell subarea temperatures of the cell group. If the cell subarea temperature is within the preset subarea temperature interval [Tmin, Tmax], the battery manager controls the semiconductor thermoelectric refrigeration array group to operate at low power or intermittently to keep the temperature of the cell, and controls the cell subarea temperature to be within [Tmin, Tmax]. If the cell subarea temperature is greater than the maximum value Tmax of the preset subarea temperature, the battery manager controls the semiconductor thermoelectric refrigeration array group to dissipate heat from the cell. If the cell subarea temperature is less than the minimum value Tmin of the preset subarea temperature, the battery manager controls the semiconductor thermoelectric refrigeration array group to heat the cell.

[0028] Therefore, the lithium battery thermal management method based on the battery bidirectional temperature control device can control the semiconductor thermoelectric refrigeration array group to control the temperature of the corresponding cell sub-area according to the temperature of the cell sub-area, dynamically regulate the temperature of the cell sub-area, and keep the temperature of the cell sub-area in the preset sub-area temperature range. Therefore, the temperature of the cell sub-area is kept balanced, the local hot spot problem caused by different temperatures between the cells in the cell group is reduced, and the service life of the cell group is prolonged. Compared with the prior art, the semiconductor thermoelectric refrigeration array group used in the lithium battery thermal management method based on the battery bidirectional temperature control device is combined with the temperature equalizing assembly on the surface of the lithium battery. The Peltier effect generated by the semiconductor thermoelectric refrigeration array group after being powered on can directly cool or heat the cell, so that the effect of controlling the temperature of the cell is achieved. In addition, the semiconductor thermoelectric refrigeration array group has a simple structure and a small mass, which improves portability. At the same time, the semiconductor thermoelectric refrigeration array group is not affected by the heat capacity characteristics of itself, and has a fast response and adjustment speed, so that it can dynamically adjust the temperature of the cell in a timely manner.

[0029] In one embodiment, detecting whether the cell sub-area temperature matches the preset sub-area temperature specifically includes the following steps: detecting whether the cell sub-area temperature is located in the preset sub-area temperature range.

[0030] In this embodiment, the battery manager controls the semiconductor thermoelectric refrigeration array group according to the cell sub-area temperature. When the cell sub-area temperature is in the preset sub-area temperature range, the semiconductor thermoelectric refrigeration array group keeps the temperature of the cell constant; when the cell sub-area temperature is greater than the maximum value Tmax of the preset sub-area temperature range, the semiconductor thermoelectric refrigeration array group cools the cell to reduce the cell sub-area temperature to the preset sub-area temperature range; and when the cell sub-area temperature is less than the minimum value Tmin of the preset sub-area temperature range, the semiconductor thermoelectric refrigeration array group heats the cell to increase the cell sub-area temperature to the preset sub-area temperature range.

[0031] In one embodiment, when the cell sub-area temperature matches the preset sub-area temperature, the battery manager sends a constant temperature low-power signal to the semiconductor thermoelectric refrigeration array group, so that the corresponding module of the semiconductor thermoelectric refrigeration array group operates at low power or intermittently. Specifically, the method includes the following steps: If the cell sub-area temperature is in the preset sub-area temperature range, the semiconductor thermoelectric refrigeration array group switches to the constant temperature mode to keep the temperature of the cell.

[0032] In this embodiment, specifically, the battery manager uses a PID control system to control the output power P of the semiconductor thermoelectric refrigeration array group out保温After determining that the cell partition temperature is within the preset partition temperature range, the battery manager controls the semiconductor thermoelectric cooling array to operate at low power or intermittently. When the cell partition temperature approaches the maximum value Tmax of the preset partition temperature range, the semiconductor thermoelectric cooling array will reduce the cell partition temperature to a safe temperature Tsafe; when the cell partition temperature approaches the minimum value Tmin of the preset partition temperature range, the semiconductor thermoelectric cooling array will raise the cell partition temperature to the target temperature Ttarget. It should be noted that the safe temperature Tsafe is less than the target temperature Ttarget. Specifically, after the cell zone temperature drops to the safe temperature Tsafe, a safety margin is maintained between Tsafe and the maximum value Tmax of the preset zone temperature range. This is because the cell zone temperature at this point is close to the maximum value Tmax, preventing the cell zone temperature from rising sharply to Tmax due to environmental influences. Similarly, after the cell zone temperature rises to the target temperature Ttarget, a safety margin is maintained between Ttarget and the minimum value Tmax of the preset zone temperature range. This is because the cell zone temperature at this point is close to the minimum value Tmin of the preset zone temperature range, preventing the cell zone temperature from dropping sharply to Tmin due to environmental influences.

[0033] In one embodiment, when the cell partition temperature matches the preset partition temperature, the battery manager sends a constant temperature low power signal to the semiconductor thermoelectric cooling array group so that the corresponding module of the semiconductor thermoelectric cooling array group can operate at low power or intermittently. The specific steps also include the following steps. If the cell zone temperature is outside the preset zone temperature range, then check whether the cell zone temperature is greater than the upper limit of the preset zone temperature range. If the temperature of a cell zone exceeds the upper limit of the preset zone temperature range, the semiconductor thermoelectric cooling array group switches to heat dissipation mode to cool the cell.

[0034] In this embodiment, when the cell partition temperature does not match the preset partition temperature range, it is necessary to determine whether the cell partition temperature is greater than the upper limit of the preset partition temperature range. Therefore, when the cell partition temperature is greater than the upper limit Tmax of the preset partition temperature range, the semiconductor thermoelectric cooling array will dissipate heat from the cell to prevent thermal runaway, and the semiconductor thermoelectric cooling array will reduce the cell partition temperature to a safe temperature Tsafe.

[0035] In one embodiment, after the semiconductor thermoelectric cooling array group switches to heat dissipation mode, the following steps are further included: when the state of charge of the battery pack is within a first preset range value, and / or the first correction coefficient of the charge-discharge rate of the battery pack is greater than 0, the output power of the semiconductor thermoelectric cooling array group in heat dissipation mode increases.

[0036] In this embodiment, the battery manager uses a PID control system to control the P of the heat dissipation output power of the semiconductor thermoelectric cooling array. out散热 To perform control, where P out散热 The following functional relationship must be satisfied. In the formula, This is the proportionality coefficient. This is a correction function for the state of charge (SOC) of the battery pack. The correction function for the charge / discharge rate Crate of the battery pack. The integral time constant is... Differential time constant, This represents the deviation of the temperature input. for The integral over time t for The derivative over time t.

[0037] It should be noted that during the operation of the battery cell, the current magnitude will change due to the internal resistance of the cell. This requires the PID control system to adjust the output power P of the semiconductor thermoelectric cooling array. out散热 For precise control, the battery manager also calculates the current state of charge (SOC) of the battery pack and the current charge / discharge rate (Crate) of the battery pack to adjust the heat dissipation power (P). out散热 Adjustments are made. Specifically, the correction amount for the State of Charge (SOC) of the battery pack satisfies the correction function. for, , In the formula , This is the SOC correction factor. In this embodiment... It is 0.8. It is 1.2.

[0038] When the cell's state of charge (SOC) is at At the specified time, i.e., within the first preset range, the battery cell has sufficient charge, and the heat dissipation power P of the semiconductor thermoelectric cooling array group is [value missing]. out散热 The current can be increased accordingly to accelerate the cooling of the cell partition temperature and prevent thermal runaway caused by prolonged high temperature in the cell partition. The battery manager controls the forward conduction of the current on the semiconductor thermoelectric cooling array, which generates a cooling effect according to the Peltier effect, dissipating heat from the cell assembly and reducing the cell partition temperature. When the cell's state of charge (SOC) is... At that time, the correction function of SOC When the state of charge (SOC) of the battery cell is 0, the TEC module can operate normally. At this time, P out散热 No need for Make corrections; when the cell's state of charge (SOC) is... At the same time, to avoid excessive energy consumption of the battery cells, the heat dissipation power P of the semiconductor thermoelectric cooling array group is... out散热 The battery cell rises slowly to dissipate heat gradually while maintaining its basic operating condition.

[0039] It should also be noted that when the cell zone temperature exceeds the upper limit Tmax of the preset zone temperature range, If the battery pack discharges, according to the thermal effect of the current, increasing the discharge current will cause the heat in each cell of the pack to increase, leading to a rapid rise in the internal temperature of the pack and the risk of thermal runaway. Therefore, the battery manager needs to adjust the heat dissipation power P of the semiconductor thermoelectric cooling array according to the charge / discharge rate of the battery pack. out散热 The correction function satisfied by the correction amount of the cell charge / discharge rate Crate for, The correction factor Kd for the cell charge / discharge rate Crate is greater than 0 during discharge. In this embodiment, Kd is 0.5. .in this way, Increasing the value of , i.e. increasing the proportional element in the PID control system, enables the corresponding cell partition of the semiconductor thermoelectric cooling array to quickly dissipate heat and cool down, thus preventing the cell from overheating and causing thermal runaway.

[0040] Specifically, after the semiconductor thermoelectric cooling array switches to heat dissipation mode, the temperature of the corresponding cell partition is reduced to Tsafe. The aforementioned temperature input deviation satisfies the following functional relationship. T represents the cell zone temperature. Thus, the heat dissipation power of the semiconductor thermoelectric cooling array group meets the requirements. In this embodiment, The temperature is 15℃.

[0041] In one embodiment, if the cell partition temperature is outside a preset partition temperature range, after detecting whether the cell partition temperature is greater than the upper limit of the preset partition temperature range, the specific steps include: If the temperature of a cell zone is lower than the lower limit of a preset zone temperature range, the semiconductor thermoelectric cooling array group switches to heating mode to heat the cell.

[0042] In this embodiment, when the cell partition temperature is lower than the preset partition temperature lower limit Tmin, in order to avoid lithium plating in the cell and prevent the cell capacity from decreasing, the semiconductor thermoelectric cooling array group raises the cell partition temperature to the target temperature Ttarget.

[0043] In one embodiment, after the semiconductor thermoelectric cooling array group switches to heating mode, the following steps are further included: when the state of charge of the battery pack is within a first preset range value, and / or the second correction coefficient of the charge-discharge rate of the battery pack is less than 0, the output power of the semiconductor thermoelectric cooling array group in heating mode increases.

[0044] In this embodiment, the battery manager uses a PID control system to control the P of the heating output power of the semiconductor thermoelectric cooling array. out加热 To perform control, where P out加热 The following functional relationship must be satisfied. In the formula, This is the proportionality coefficient. This is a correction function for the cell's state of charge (SOC). This is a correction function for the charge / discharge rate (Crate) of the battery cell. The integral time constant is... Differential time constant, This represents the deviation of the temperature input. for The integral over time t for The derivative over time t.

[0045] It should be noted that during the operation of the battery cell, the current magnitude will change due to the internal resistance of the cell. This requires the PID control system to adjust the output power P of the semiconductor thermoelectric cooling array. out散热 For precise control, the battery manager also calculates the current state of charge (SOC) of the battery pack and the current charge / discharge rate (Crate) of the battery pack to adjust the heat dissipation power (P). out散热 Adjustments are made. Specifically, the correction amount for the State of Charge (SOC) of the battery pack satisfies the correction function. for, , In the formula , This is the SOC correction factor. In this embodiment... It is 0.8. It is 1.2.

[0046] When the cell's state of charge (SOC) is at At the specified time, i.e., within the first preset range, the battery cell has sufficient charge, and the heating power P of the semiconductor thermoelectric cooling array group is [value missing]. out加热 The current can be increased accordingly to accelerate the temperature rise of the battery cell (T). The battery manager controls the reverse conduction of the current on the semiconductor thermoelectric cooling array, which heats the array according to the Peltier effect, thereby raising the temperature of the battery cell. When the battery cell's state of charge (SOC) is... At that time, the correction function of SOC When the state of charge (SOC) of the battery cell is 0, the TEC module can operate normally. At this time, P out加热 No need for Make corrections; when the cell's state of charge (SOC) is... At the same time, to avoid excessive energy consumption of the battery cells, the heating power P of the semiconductor thermoelectric cooling array group is... out加热 The temperature rises slowly, gradually heating the battery cell while maintaining its basic operating condition.

[0047] Among them, when At that time, the heating power P of the semiconductor thermoelectric cooling array module out加热 The heating limit will be reached, at which point the battery manager will reduce the heating power P of the semiconductor thermoelectric cooling array. out加热 Reduced to ,in satisfy, This slows down the rate of decrease in cell SOC, maintains stable cell operation, and ensures that the TEC module can heat the cell to prevent lithium plating in low-temperature environments, which would reduce cell capacity.

[0048] It should be noted that if the cell temperature is lower than the preset minimum temperature Tmin, and the cell is in a charging state at this time, lithium deposition will occur on the electrode surface, which will cause the battery to be scrapped.

[0049] Therefore, the battery manager needs to adjust the heat dissipation power P of the semiconductor thermoelectric cooling array according to the charge / discharge rate of the battery cell pack. out散热 The correction function satisfied by the correction amount of the cell charge / discharge rate Crate for, The correction factor Kc for the cell charge / discharge rate (Crate) is less than 0 during charging. In this embodiment, Kc is -0.5. .in this way, The value of is reduced, that is, the proportional element in the PID control system is reduced, so that at least one TEC module can slowly heat up at least one cell, avoiding damage to the cell by instantaneous heating of the semiconductor thermoelectric cooling array, thereby enabling the cell to undergo slow "moderate heating".

[0050] Specifically, after the semiconductor thermoelectric cooling array group switches to heating mode, the corresponding cell zone temperature is raised to Ttarget. The aforementioned temperature input deviation satisfies the following functional relationship. T represents the cell zone temperature. Thus, the heat dissipation power of the semiconductor thermoelectric cooling array group meets the requirements. In this embodiment, The temperature is 25℃.

[0051] In one embodiment, if the cell zone temperature is within a preset zone temperature range, the semiconductor thermoelectric cooling array group switches to constant temperature mode to keep the cell warm.

[0052] It should be noted that when the battery cell is in charging or discharging state, a high charge / discharge rate (Crate) will cause the cell temperature to rise. Specifically, when the cell zone temperature falls between the preset minimum zone temperature (Tmin) and the preset maximum zone temperature (Tmax), temperature fluctuations will occur. The battery manager needs to correct the cell charge / discharge rate (Crate) to adjust the cell's charging and discharging rate, and simultaneously adjust the output power (P) of the semiconductor thermoelectric cooling array. out保温 This ensures that the temperature of each cell zone remains within the preset zone temperature range. During charging, if the cell charging rate Crate is greater than 1, the correction amount for the cell charging rate Crate satisfies the correction function. for, The correction factor Kc for the cell charging rate (Crate) is less than 0 during charging. In this embodiment, Kc is -0.5. .in this way, The value of decreases, that is, the proportional element in the PID control system is reduced, thus reducing the output power P of the semiconductor thermoelectric cooling array. out保温 When the response decreases, the semiconductor thermoelectric cooling array reduces power or operates intermittently. If the cell zone temperature is close to the preset minimum temperature Tmin, the semiconductor thermoelectric cooling array will raise the cell zone temperature to Ttarget. If the cell zone temperature is close to the preset maximum temperature Tmax, the semiconductor thermoelectric cooling array will lower the cell zone temperature to Tsafe. During discharge, the cell discharge rate Crate is greater than 1, and the correction amount for the cell discharge rate Crate satisfies the correction function. for, The correction factor Kd for the cell charge / discharge rate (Crate) is greater than 0 during discharge. During discharge, the increased current generates a thermal effect, leading to a rise in the temperature of different areas within the cell. In this embodiment, Kd is 0.5, therefore... .in this way, Increasing the value of , i.e. increasing the proportional element in the PID control system, enables the semiconductor thermoelectric cooling array to rapidly cool the cell zone temperature, preventing the cell from overheating and rising to the preset maximum temperature Tmax, thereby providing "rapid heat dissipation" for the cell.

[0053] This disclosure also provides a lithium battery thermal management device based on a bidirectional battery temperature control device, comprising: Temperature acquisition module, the temperature acquisition module is used to acquire the cell zone temperature of the cell group; The detection module is used to detect whether the cell zone temperature matches the preset zone temperature; The signal output module is used to send a constant temperature low power signal to the battery manager when the cell zone temperature matches the preset zone temperature, so that the corresponding module of the semiconductor thermoelectric cooling array group can operate at low power or intermittently.

[0054] In one embodiment, the lithium battery thermal management device based on the bidirectional temperature control device further includes a real-time clock module and a current sensing module. The real-time clock module can record the working time t of several cells in at least one of the cell groups, and the current sensing module can detect the current I of several cells in the cell group, thereby calculating the state of charge (SOC) of the cell group.

[0055] In this embodiment, the battery manager uses the ampere-hour integration method to calculate the state of charge (SOC) of the cell pack. The SOC of the cell pack satisfies the following functional relationship. SOC = SOC0 - 1 / Q d (n=1,2,3....) In the formula, SOC0 is the state of charge of the battery pack in the initial state. In this embodiment, SOC0 is 100%, and Q is the total capacity of the battery pack. and The battery manager calculates the time value of the state of charge (SOC) of the cell pack, where, satisfy Initial time The value is 0, and I is the current of the battery pack. for[ , The integral variable is ].

[0056] In one embodiment, the real-time clock module also records the calculation period nT (n=1,2,3....) of the battery manager to more accurately calculate the state of charge (SOC) of the current cell group. When n=1, the sampling period is T, i.e., the first sampling period; in this embodiment, the sampling period T is 100ms. The real-time clock module records the SOC of the cell every 100ms. The battery manager uses the ampere-hour integration method to calculate the current SOC of the cell, thereby accurately determining the cell's state of charge to influence the output of the semiconductor cooling array. , and Dynamic adjustment is performed to better control the temperature of different zones within the battery cell.

[0057] In one embodiment, the battery manager also calculates the discharge rate (Crate) of the battery pack using the cell pack current I and the total capacity (Q) of the cell pack. In this embodiment, the cell pack current I is obtained by summing the currents of several cells in the cell pack using a current sensing module. The battery manager then calculates the charge / discharge rate (Crate) of the cell pack, where Crate satisfies the following functional relationship: Crate = I / Q, where I is the cell pack current I and Q is the capacity value of the cell.

[0058] This disclosure also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the lithium battery thermal management method based on the battery bidirectional temperature control device in the above embodiments.

[0059] This disclosure also provides a storage medium storing a computer program thereon, characterized in that, when the computer program is executed by a processor, it implements the steps of the lithium battery thermal management method based on the battery bidirectional temperature control device in the above embodiments.

[0060] Compared with the prior art, this disclosure has at least the following advantages: 1. In the lithium battery thermal management method based on the bidirectional battery temperature control device described above, after obtaining the temperatures of several cell zones in the cell assembly, the battery manager determines whether the temperature of each cell zone matches the preset zone temperature. If the cell zone temperature is within the preset zone temperature range [Tmin, Tmax], the battery manager controls the semiconductor thermoelectric cooling array to maintain the temperature of the cell at low power consumption or intermittently, keeping the cell zone temperature within [Tmin, Tmax]. If the cell zone temperature is greater than the maximum preset zone temperature Tmax, the battery manager controls the semiconductor thermoelectric cooling array to dissipate heat from the cell; if the cell zone temperature is less than the minimum preset zone temperature Tmin, the battery manager controls the semiconductor thermoelectric cooling array to heat the cell.

[0061] 2. Thus, the lithium battery thermal management method based on a bidirectional battery temperature control device can control the temperature of the corresponding cell zone according to the temperature of different cell zones, dynamically regulating the cell temperature in that zone to keep all cells in the cell group within a preset zone temperature. This maintains a uniform internal temperature among the cells in the cell group, reducing localized hotspots caused by temperature differences between cells and extending the lifespan of the cell group. Compared to existing technologies, the lithium battery thermal management method based on a bidirectional battery temperature control device uses a semiconductor thermoelectric cooling array combined with a temperature equalization component on the lithium battery surface. The Peltier effect generated when the semiconductor thermoelectric cooling array is energized directly cools or heats the cells, achieving a temperature control effect. Furthermore, the semiconductor thermoelectric cooling array has a simple structure, low weight, and improved portability. Simultaneously, the semiconductor thermoelectric cooling array is not affected by its own heat capacity characteristics, has a fast response and adjustment speed, and can dynamically adjust according to the cell temperature in a timely manner.

[0062] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A lithium battery thermal management method based on a bidirectional battery temperature control device, characterized in that, A bidirectional temperature control device for lithium batteries is used for bidirectional temperature regulation. The device includes: a cell assembly, a temperature equalization component, a semiconductor thermoelectric cooling array assembly, a temperature sensor array assembly, and a battery manager. The cell assembly comprises several cells. The semiconductor thermoelectric cooling array assembly is disposed within the cell assembly and in contact with the cells. Each module of the semiconductor thermoelectric cooling array assembly corresponds to a section within the cell assembly. The temperature equalization component is located between the semiconductor thermoelectric cooling array assembly and the cells. The temperature sensor array assembly is correspondingly disposed to the semiconductor thermoelectric cooling array assembly and is used to collect the temperature of each section within the cell assembly. The output of the temperature sensor array assembly is connected to the sampling end of the battery manager. The bidirectional temperature control end of the battery manager is connected to the controlled end of the semiconductor thermoelectric cooling array assembly. The lithium battery module based on temperature equalization management can perform the following steps: Obtain the cell zone temperature of the battery cell assembly; Check whether the cell zone temperature matches the preset zone temperature; When the cell zone temperature matches the preset zone temperature, the battery manager sends a constant temperature low power signal to the semiconductor thermoelectric cooling array group, so that the corresponding module of the semiconductor thermoelectric cooling array group can operate at low power or intermittently.

2. The lithium battery thermal management method based on a bidirectional battery temperature control device according to claim 1, characterized in that, The specific steps to check whether the cell zone temperature matches the preset zone temperature include: Check whether the temperature of the battery cell zone is within the preset zone temperature range.

3. The lithium battery thermal management method based on a bidirectional battery temperature control device according to claim 2, characterized in that, When the cell zone temperature matches the preset zone temperature, the battery manager sends a constant temperature low-power signal to the semiconductor thermoelectric cooling array group, so that the corresponding module of the semiconductor thermoelectric cooling array group can operate at low power or intermittently. Specifically, the following steps are included: If the cell zone temperature is within the preset zone temperature range, the semiconductor thermoelectric cooling array group switches to constant temperature mode to keep the cell warm.

4. The lithium battery thermal management method based on a bidirectional battery temperature control device according to claim 2, characterized in that, When the cell zone temperature matches the preset zone temperature, the battery manager sends a constant temperature low power signal to the semiconductor thermoelectric cooling array group so that the corresponding module of the semiconductor thermoelectric cooling array group can operate at low power or intermittently. The specific steps also include: If the cell zone temperature is outside the preset zone temperature range, then check whether the cell zone temperature is greater than the upper limit of the preset zone temperature range. If the temperature of a cell zone exceeds the upper limit of the preset zone temperature range, the semiconductor thermoelectric cooling array group switches to heat dissipation mode to cool the cell.

5. The lithium battery thermal management method based on a bidirectional battery temperature control device according to claim 4, characterized in that, After the semiconductor thermoelectric cooling array group switches to heat dissipation mode, the following steps are also included: when the state of charge of the battery cell group is within a first preset range value, and / or the first correction coefficient of the battery cell charge-discharge rate is greater than 0, the output power of the semiconductor thermoelectric cooling array group in heat dissipation mode increases.

6. The lithium battery thermal management method based on a bidirectional battery temperature control device according to claim 4, characterized in that, If the cell zone temperature is outside the preset zone temperature range, after checking whether the cell zone temperature is greater than the upper limit of the preset zone temperature range, the specific steps include: If the temperature of a cell zone is lower than the lower limit of a preset zone temperature range, the semiconductor thermoelectric cooling array group switches to heating mode to heat the cell.

7. The lithium battery thermal management method based on a bidirectional battery temperature control device according to claim 6, characterized in that, After the semiconductor thermoelectric cooling array group switches to heating mode, the following steps are also included: when the state of charge of the battery pack is within a first preset range value, and / or the second correction coefficient of the charge-discharge rate of the battery pack is less than 0, the output power of the semiconductor thermoelectric cooling array group in heating mode increases.

8. A lithium battery thermal management device based on a bidirectional battery temperature control device, characterized in that, include: Temperature acquisition module, the temperature acquisition module is used to acquire the cell zone temperature of the cell group; The detection module is used to detect whether the cell zone temperature matches the preset zone temperature; The signal output module is used to send a constant temperature low power signal to the battery manager when the cell zone temperature matches the preset zone temperature, so that the corresponding module of the semiconductor thermoelectric cooling array group can operate at low power or intermittently.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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