Temperature detection methods and systems

Abstract

This invention belongs to the field of battery formation and capacity testing technology, and discloses a temperature detection method and system. The method includes placing the battery under test into a preset storage location, utilizing the contact heat conduction between the battery and a temperature probe to perform online functional testing of the temperature probe, thereby enabling operators to obtain the functional status of the temperature probe in a timely manner. Simultaneously, this functional testing does not require the use of dedicated testing equipment, significantly shortening the testing time and reducing the testing complexity. Therefore, it does not negatively impact the efficiency of the formation and capacity testing processes, avoids the lag in detecting temperature probe anomalies, reduces invalid tests caused by temperature probe anomalies, and further improves the efficiency and accuracy of the formation and capacity testing processes.

Description

Technical Field

[0001] This invention relates to the field of battery formation and capacity technology, and in particular to at least one temperature detection method and system. Background Technology

[0002] During the battery production process, such as formation and capacity testing, the battery needs to be placed in the corresponding storage location of the testing equipment, and multiple temperature probes are used to detect the temperature of the battery during charging and discharging, so as to achieve safe battery formation and calculate the battery's fitted capacity.

[0003] In actual operation, after testing, it is often found that the measurement data of individual or some temperature probes are significantly different from the temperature measurement data of adjacent temperature probes, reflecting that the battery has localized high or low temperatures. In order to confirm whether the battery actually has localized high or low temperature anomalies, it is necessary to perform functional testing and calibration on multiple temperature probes hidden deep in the storage location. However, such functional testing and calibration requires the use of dedicated testing equipment with independent and controllable heat sources, which is complex, time-consuming, and labor-intensive, affecting the efficiency of formation and capacity testing.

[0004] Therefore, there is an urgent need for at least one temperature detection method and system to solve the above-mentioned technical problems. Summary of the Invention

[0005] The first objective of this invention is to provide a temperature detection method that can reduce or avoid invalid detections caused by abnormal temperature probes, and will not negatively affect the efficiency of the formation and capacity testing processes.

[0006] To achieve this objective, the present invention adopts the following technical solution: Temperature detection methods include: The battery under test is placed in a preset storage location, all temperature probes are set to the initial state, and the initial state temperature K1 of each temperature probe is read. The initial state is configured such that the temperature probe and the battery under test are spaced apart. The temperature probe is changed from the initial state to the detection state, and the detection state is configured such that at least one probe portion of the temperature probe comes into contact with the battery under test. Wait for a first preset time T1, and read the initial detection temperature K2 of each temperature probe; The difference ΔK1 between the initial detection temperature K2 and the initial state temperature K1 for each temperature probe is compared with a preset first difference range, wherein, If the difference ΔK1 of all the temperature probes falls within the preset first difference range, a detection step is performed; if the difference ΔK1 of at least one temperature probe falls outside the preset first difference range, an alarm step is performed.

[0007] The second objective of this invention is to provide another temperature detection method that can reduce or avoid invalid detections caused by abnormal temperature probes, without negatively impacting the efficiency of the formation and capacity testing processes.

[0008] To achieve this objective, the present invention adopts the following technical solution: Temperature detection methods include: The battery under test is placed in a preset storage location, all temperature probes are set to the initial state, and the initial state temperature K1 of each temperature probe is read. The initial state is configured such that the temperature probe and the battery under test are spaced apart. The temperature probe is changed from the initial state to the detection state, and the detection state is configured such that at least one probe portion of the temperature probe comes into contact with the battery under test. According to the preset sampling interval Read a total of M temperature readings; according to The cumulative temperature rise S of the temperature probe is calculated, where i is the temperature sampling number. The temperature detection value corresponding to the i-th sampling sequence number. This is the preset reference temperature; The cumulative temperature rise S is compared with a preset lower threshold. If the cumulative temperature rise S is greater than or equal to the lower threshold value, then... If the cumulative temperature rise S is less than the lower threshold, then proceed with the detection step; If so, an alarm procedure will be initiated.

[0009] The third objective of this invention is to provide a temperature detection system that can reduce or avoid invalid detections caused by abnormal temperature probes, and will not negatively affect the efficiency of the formation and capacity testing processes.

[0010] To achieve this objective, the present invention adopts the following technical solution: A temperature detection system, used to implement the above-described temperature detection method, includes: A limiting device is provided with a preset storage position, which is used to limit the storage of the battery to be tested. A temperature detection device includes a driving mechanism and a temperature probe. The driving mechanism is throttledly connected to the temperature probe and can drive the temperature probe to move toward the battery under test until the temperature probe comes into contact with the battery under test. The driving mechanism can also drive the temperature probe to move away from the battery under test until the temperature probe and the battery under test are spaced apart. A data processing module is connected to the temperature probe signal and is used to read the measured temperature value of the temperature probe. The data processing module can perform differential calculation on multiple measured temperature values ​​of the same temperature probe and compare the difference obtained by differential calculation with a preset difference range. When the difference falls outside the preset difference range, the data processing module can issue an alarm signal. A data storage module is signal-connected to the data processing module and is used to store the preset difference range; A timing control module, which is signal-connected to the drive mechanism and the data processing module, is used to send a read trigger signal to the data processing module after a preset time period when the temperature probe contacts and / or leaves the battery under test. The data processing module responds to the read trigger signal to read the measured temperature value.

[0011] The above technical solution has the following advantages or beneficial effects: Using the temperature detection method described above, the functionality of the temperature probe can be tested online during the formation and capacity testing processes of the battery under test, utilizing the contact heat conduction between the battery and the temperature probe. This allows operators to obtain the functional status of the temperature probe in a timely manner. Furthermore, this functional testing eliminates the need for specialized testing equipment, significantly reducing testing time and complexity. Therefore, it does not negatively impact the efficiency of the formation and capacity testing processes, avoids the lag in detecting temperature probe anomalies, reduces invalid tests caused by temperature probe malfunctions, and further improves the efficiency and accuracy of the formation and capacity testing processes.

[0012] The aforementioned temperature detection system enables online functional testing of temperature probes during the formation or capacity testing process, utilizing contact heat conduction between the battery under test and the temperature probe. This allows operators to promptly obtain information on the probe's functionality. Furthermore, this functional testing eliminates the need for specialized equipment, significantly reducing testing time and complexity, thus avoiding negative impacts on the efficiency of the formation and capacity testing processes and significantly lowering testing costs. Moreover, this temperature detection system avoids the lag in detecting temperature probe anomalies, reducing invalid tests caused by probe malfunctions, and further improving the efficiency and accuracy of the formation and capacity testing processes. Attached Figure Description

[0013] Figure 1 This is a flowchart of a first temperature detection method in one embodiment of the present invention; Figure 2 This is a flowchart of the second temperature detection method in one embodiment of the present invention; Figure 3This is a flowchart of the temperature detection system in one embodiment of the present invention. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0015] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," and "abutting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0016] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0017] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0018] In battery manufacturing, formation and capacity testing are crucial processes for ensuring battery performance and selecting qualified products. Temperature is a key influencing factor in both processes and a critical indicator of their quality. For example, in the formation process, high temperatures can lead to electrolyte decomposition and abnormal SEI film growth, affecting cycle life and safety. Conversely, excessively low temperatures reduce battery reactivity, resulting in incomplete formation and inaccurate capacity testing data, failing to accurately reflect the battery's actual capacity and electrochemical performance. Therefore, temperature probes are necessary for rigorous and precise temperature measurement during formation and capacity testing to provide data support for process parameter adjustments and product quality control.

[0019] In related technologies, temperature probes generally include a sensing element, a buffer spring, and a protective housing. The sensing element, including a thermistor or other detection device, converts temperature changes into corresponding electrical signals and can quickly respond to changes in the battery's surface temperature by contacting the temperature-measuring area. One end of the buffer spring is connected to the sensing element, and the other end passes through the protective housing and connects to its inner wall. The buffer spring provides elastic cushioning for the sensing element, protecting both the battery surface and the sensing element. For example, when the temperature probe moves from a position away from the battery towards the battery, the sensing element contacts the battery surface. At this time, the buffer spring absorbs the contact pressure through its own compression deformation, preventing excessive contact pressure between the sensing element and the battery surface. It also ensures a tight and good fit between the sensing element and the battery surface, thereby guaranteeing measurement accuracy and the lifespan of the temperature probe.

[0020] Specifically, in the battery formation process, related technologies often employ formation cabinets, restraint trays, and other equipment to process multiple batteries in batches. For example, the formation cabinet has preset storage compartments, each capable of holding one battery to be tested. Above each preset storage compartment is a needle bed with multiple temperature probes arranged on it, all with their probes facing the preset storage compartment. When temperature testing is required, the needle bed moves towards the preset storage compartment until a buffer spring is compressed and the probes contact the battery surface. Depending on the testing needs, multiple temperature probes can be positioned for each preset storage compartment to measure different areas of the battery surface. Similarly, in the capacity grading process, batteries are placed in preset storage compartments of the capacity grading equipment, and temperature probes perform contact measurements in a similar manner under the action of the needle bed and other devices.

[0021] However, in the aforementioned testing process, if the temperature probe malfunctions, the only way to determine if a fault truly exists is through reverse analysis of the measurement results. This leads to decreased reliability of the measurement results and introduces a time lag. To avoid this lag, related technologies employ dedicated testing equipment with an independent, controllable heat source. This equipment is inserted into a pre-set storage location and heated to perform functional testing and calibration of the temperature probe. However, this testing process is time-consuming and labor-intensive, which can affect the efficiency of normalization and capacity testing processes.

[0022] Therefore, embodiments of the present invention provide a variety of temperature detection methods and systems that can realize online detection in the formation and capacity separation processes. They can promptly detect whether the temperature probe is functioning properly during the formation and capacity separation processes, and are convenient and quick, without negatively impacting the efficiency of existing formation and capacity separation processes.

[0023] Specifically, such as Figure 1 As shown, the temperature detection method includes: S1. Place the battery under test into the preset storage location, set all temperature probes to the initial state, and read the initial state temperature K1 of each temperature probe. The initial state is configured to set the interval between the temperature probe and the battery under test.

[0024] In step S1, the method of placing the battery under test into the preset storage location is consistent with existing related technologies, and various methods such as hoisting can be used for transportation; this invention does not specifically limit this. The initial state of the aforementioned temperature probes refers to a situation where the temperature probes and the battery under test are spaced apart, without direct contact for heat conduction. At this time, the signal measured by each temperature probe is read, i.e., the initial state temperature K1.

[0025] S2. Change the temperature probe from the initial state to the detection state. The detection state is configured such that the detection part of at least one temperature probe is in contact with the battery under test.

[0026] In step S2, during the detection state, the probe of the temperature probe abuts against the surface of the battery under test, and the buffer spring is compressed, causing the probe to abut against the surface of the battery under test with a preset pressure. Further, for a device with multiple temperature probes that need to move synchronously, taking the aforementioned needle bed as an example, by moving the needle bed along a direction close to the battery under test until all temperature probes abutting the battery surface have suitable abutting pressure, and the number is greater than the sum of the number of temperature probes that failed to abut against the battery under test and the number of temperature probes that abutted but with insufficient abutting pressure, that is, only temperature probes with mechanical faults (such as a stuck buffer spring) fail to abut against the surface of the battery under test, and the aforementioned detection state is considered to have been achieved.

[0027] S3. Wait for the first preset time T1, and read the initial detection temperature K2 of each temperature probe.

[0028] Within the first preset time T1, since the sensing part of the temperature probe comes into direct contact with the surface of the battery under test, heat will be transferred from the surface of the battery to the sensing part. In other words, if the temperature probe is in normal condition, the initial detection temperature K2 should be higher than the initial state temperature K1. Specifically, the timing and waiting can be triggered by the sensor detecting the movement distance or position of the needle bed. For example, when the position of the needle bed is detected to allow the temperature probe to enter the detection state, timing and waiting begin.

[0029] S4. Compare the difference ΔK1 between the initial detection temperature K2 and the initial state temperature K1 for each temperature probe with a preset first difference range, wherein, If the difference ΔK1 of all temperature probes falls within the preset first difference range, the detection step is performed; if the difference ΔK1 of at least one temperature probe falls outside the preset first difference range, the alarm step is performed.

[0030] In step S4, the preset first difference range can be pre-stored data obtained based on experience or statistics, and is positively correlated with the first preset time T1, and related to the ambient temperature of the temperature probe. For example, when the first preset time T1 is 5 seconds and the ambient temperature is 20 degrees Celsius, the preset first difference range is 0.1-0.15 degrees Celsius. When the difference ΔK1 is less than 0.1, for example, 0, 0.05, 0.09, it indicates that the temperature probe is not making good contact with the battery under test, or that the detection components such as the thermistor in the detection unit are malfunctioning. When the difference ΔK1 is greater than 0.15, it indicates that the detection components such as the thermistor in the detection unit are malfunctioning. It is understood that, depending on the ambient temperature, the first preset time T1 can also be any duration between 3 and 8 seconds; this is not specifically limited in this invention.

[0031] In some embodiments, the units for the initial temperature K2, the initial state temperature K1, the difference ΔK1, and the preset first difference range are all degrees Celsius. In other embodiments, the units for the initial temperature K2, the initial state temperature K1, the difference ΔK1, and the preset first difference range can also be Kelvin. Since a difference of 1 degree Celsius and a difference of 1 Kelvin represent the same temperature difference, the unit of the temperature values ​​is not specifically limited in this invention, as long as they are all in the same unit.

[0032] In step S4, the detection step refers to a mature detection operation in the formation or capacity testing process using relevant technologies. For example, while charging and discharging the battery, the surface temperature of the battery under test is collected at a certain frequency using temperature probes. When the difference ΔK1 of all temperature probes falls within a preset first difference range, it indicates that the temperature probes are normal and subsequent detection steps can proceed normally. The alarm step uses audible, visual, and electrical alarm signals, through generators, warning lights, displays, and other devices, to inform the testing personnel that there is an abnormality in the temperature probes and that repair is required. Since the difference ΔK1 of each temperature probe is compared with the preset first difference range, the operator can clearly identify which one or more temperature probes have failed, which can greatly shorten the repair time.

[0033] Using the temperature detection method described above, the functionality of the temperature probe can be tested online during the formation and capacity testing processes of the battery under test, utilizing the contact heat conduction between the battery and the temperature probe. This allows operators to obtain the functional status of the temperature probe in a timely manner. Furthermore, this functional testing eliminates the need for specialized testing equipment, significantly reducing testing time and complexity. Therefore, it does not negatively impact the efficiency of the formation and capacity testing processes, avoids the lag in detecting temperature probe anomalies, reduces invalid tests caused by temperature probe malfunctions, and further improves the efficiency and accuracy of the formation and capacity testing processes.

[0034] It is understandable that, since the temperature rise within a first preset time is achieved by utilizing the thermal conduction between the battery under test and the probe, so as to detect the difference ΔK1, in the embodiments of the present invention, when the temperature probe is in the initial state, the surface temperature of the battery under test should be higher than the actual temperature of the temperature probe to form a temperature difference.

[0035] In some embodiments, since the battery under test undergoes processes such as welding, drying, and baking before entering the formation process, its temperature rises due to these processes. Therefore, as long as it enters the preset storage location before cooling to room temperature, the aforementioned temperature difference requirement can be met. Similarly, before the capacity testing process, the battery under test undergoes processes such as formation and resting. During the formation process, the battery under test experiences a significant temperature rise. Therefore, as long as the temperature of the resting space is higher than the actual temperature of the temperature probe during the resting process, the aforementioned temperature difference requirement can also be met when the battery under test leaves the resting space and enters the preset storage location.

[0036] Optionally, in some embodiments, the formation equipment or capacity testing equipment can be placed in a temperature-controlled space, and the temperature of the entire space can be regulated using a temperature control device such as an air conditioner. Simultaneously, by moving the battery under test from a room temperature environment into this space and stabilizing the temperature of the space at a temperature lower than room temperature, the requirement that the surface temperature of the battery under test should be higher than the actual temperature of the temperature probe in the initial state can be met. Of course, in some embodiments, the temperature difference requirement can also be achieved by heating the battery under test. Therefore, this invention does not limit the specific means of ensuring that the surface temperature of the battery under test is higher than the actual temperature of the temperature probe in the initial state, as long as the aforementioned temperature difference can be achieved.

[0037] For example, in some embodiments, a cooling nozzle can be installed at a preset storage location to cool the temperature probe by spraying cooler air or compressed air. Since compressed air expands as it leaves the cooling nozzle, it absorbs heat, thus achieving a cooling effect. By controlling the spraying time and flow rate, the temperature of the temperature probe in its initial state can be accurately controlled. Specifically, in some embodiments, the air cooling is performed before the battery under test is placed into the preset storage location, and after air cooling, the battery under test is placed and temperature is measured consecutively.

[0038] Furthermore, in some embodiments, the temperature drop of the probe after the battery under test and the probe are separated can be used to assess whether the temperature probe is abnormal, so that the temperature probe can be detected before the next battery under test enters the preset storage location.

[0039] Exemplary, in some embodiments, after the detection step is completed, the method further includes: S5. Obtain the temperature K3 before separation of each temperature probe, and separate the probe and the battery under test.

[0040] In step S5, the pre-separation temperature K3 can be obtained from the maturity testing operation of the battery under test, such as reading the temperature obtained at the end of the formation process or capacity testing process, or it can be read again by the temperature probe before separating the probe and the battery under test. Both methods can meet the requirement of obtaining the pre-separation temperature K3.

[0041] The specific method for separating the probe and the battery under test is to move the needle bed away from the preset storage location until the probe should theoretically be completely separated from the battery under test. Preferably, in some embodiments, the battery under test has also left the preset storage location at this time, so that the temperature inside the preset storage location significantly approaches the ambient temperature.

[0042] S6. After separation, wait for the second preset time T2 and read the temperature K4 after separation of each temperature probe.

[0043] In step S6, since the probe and the battery under test are separated, the actual temperature of the probe will decrease and approach the ambient temperature. Similar to step S3, the timing and waiting can also be triggered by a sensor. For example, when the movement distance or position of the needle bed is detected, causing the temperature probe to be in its initial state, or when the presence of the battery under test in the preset storage location changes to the absence of the battery under test, the timing and waiting are triggered.

[0044] S7. Compare the difference ΔK2 between the pre-separation temperature K3 and the post-separation temperature K4 for each temperature probe with a preset second difference range, wherein, If the difference ΔK2 of at least one temperature probe falls outside the preset second difference range, an alarm step is triggered.

[0045] In step S7, similar to step S4, the preset second difference range is pre-stored data obtained based on experience or statistics, and is positively correlated with the second preset time T2, and related to the ambient temperature of the temperature probe. When the difference ΔK2 is less than the preset second difference range, it indicates that the temperature probe has not separated from the battery under test (for example, the temperature probe is detached from the needle bed but maintains contact with the battery under test), or that the detection components such as the thermistor in the detection unit are malfunctioning. When the difference ΔK2 is greater than the preset second difference range, it indicates that the detection components such as the thermistor in the detection unit are malfunctioning.

[0046] In some embodiments, the units of the pre-separation temperature K3, the post-separation temperature K4, the difference ΔK2, and the preset second difference range are all degrees Celsius. In other embodiments, the units of the pre-separation temperature K3, the post-separation temperature K4, the difference ΔK2, and the preset second difference range may also be Kelvin. Since a difference of 1 degree Celsius and a difference of 1 Kelvin represent the same temperature difference, the units of these temperature values ​​are not specifically limited in this invention, as long as they are all in the same unit.

[0047] It is understood that when the aforementioned difference ΔK2 falls within the preset second difference range, it indicates that the detection components such as the thermistor in the detection unit are normal and are normally separated from the battery under test, which is considered an abnormal phenomenon. Therefore, when the aforementioned difference ΔK2 falls within the preset second difference range, subsequent testing of other batteries under test can be carried out normally, or normal inspection and cleaning operations can be performed. Therefore, this invention does not specifically limit the subsequent steps when the aforementioned difference ΔK2 falls within the preset second difference range.

[0048] Furthermore, in the above-described embodiment with air blowing cooling, it further includes: S8. Obtain the temperature K5 of each temperature probe before cooling by blowing air.

[0049] In step S8, the temperature of the temperature probe can be read first, and then air blowing can be performed to cool it down, so as to obtain the temperature K5 of each temperature probe before cooling down.

[0050] S9. Perform air cooling according to the third preset time T3, and read the temperature K6 after cooling of each temperature probe.

[0051] In step S9, timing is triggered when the blowing cooling begins, and the temperature probe is read after the timing reaches the third preset time T3.

[0052] S10. Compare the difference ΔK3 between the temperature K5 before cooling and the temperature K6 after cooling for each temperature probe with a preset third difference range, wherein, If the difference ΔK3 of at least one temperature probe falls outside the preset third difference range, an alarm step is triggered.

[0053] In step S10, similar to step S4, the preset third difference range is pre-stored data obtained based on experience or statistics, and is positively correlated with the third preset time T3, related to air blowing for cooling. When the above difference ΔK3 is less than the preset third difference range, it indicates that the temperature probe has not separated from the battery under test (for example, the temperature probe is detached from the needle bed but maintains contact with the battery under test), or that the detection components such as the thermistor in the detection unit are malfunctioning. When the above difference ΔK3 is greater than the preset third difference range, it indicates that the detection components such as the thermistor in the detection unit are malfunctioning.

[0054] In some embodiments, the units of the pre-cooling temperature K5, the post-cooling temperature K6, the difference ΔK3, and the preset third difference range are all degrees Celsius. In other embodiments, the units of the pre-cooling temperature K5, the post-cooling temperature K6, the difference ΔK3, and the preset third difference range may also be Kelvin. Since a difference of 1 degree Celsius and a difference of 1 Kelvin represent the same temperature difference, the units of these temperature values ​​are not specifically limited in this invention, as long as they are all in the same unit.

[0055] Understandably, if the difference ΔK1 falls within the preset first difference range and the difference ΔK3 falls within the preset third difference range, the temperature probe is normal, and therefore the corresponding temperature probe can be marked as functionally normal. If the difference ΔK1 is less than the preset first difference range and the difference ΔK3 falls within the preset third difference range, it is likely that a buffer spring malfunction is causing the detection part to fail to properly contact the test battery, and therefore the corresponding temperature probe can be marked as a suspected mechanical malfunction. If the difference ΔK1 falls outside the preset first difference range and the difference ΔK3 falls outside the preset third difference range, it is highly likely that the thermistor or other detection components are malfunctioning, and therefore the corresponding temperature probe can be marked as a suspected temperature sensing malfunction.

[0056] Optionally, in some embodiments, before the temperature probe starts waiting for a first preset time T1 (i.e., before step S3 is implemented), the real-time detection value of the temperature probe can be read and compared with the upper and lower detection limits of the temperature probe. If the real-time detection value is the upper detection limit, it indicates that the temperature probe is short-circuited and outputs a large current signal, and an alarm procedure can be directly initiated. If the real-time detection value is the lower detection limit, it indicates that the temperature probe is open-circuited and does not output a current signal, and an alarm procedure can also be directly initiated. If the real-time detection value is between the lower and upper detection limits, it indicates that the temperature probe has not experienced a short circuit or open circuit, and further steps such as step S3 can be performed.

[0057] Another embodiment of the present invention provides a temperature detection method that uses accumulated temperature rise to more accurately determine whether a temperature probe is malfunctioning. Compared to the above method that uses a difference ΔK1 and a preset first difference range for judgment, this method using accumulated temperature rise has a lower false alarm rate and false negative rate under interference from signal noise or minor environmental fluctuations. Specifically, as shown... Figure 2 As shown, the method includes: P1. Place the battery under test into the preset storage location, set all temperature probes to the initial state, and read the initial state temperature K1 of each temperature probe. The initial state is configured to set the interval between the temperature probe and the battery under test.

[0058] Step P1 is basically the same as step S1 above, and will not be described in detail in this invention.

[0059] P2. Change the temperature probe from the initial state to the detection state. The detection state is configured such that the detection part of at least one temperature probe is in contact with the battery under test.

[0060] Step P2 is basically the same as step S2 above, and will not be described in detail in this invention.

[0061] P3. According to the preset sampling interval Read a total of M temperature readings.

[0062] In step P3, after the temperature probe changes from the initial state to the detection state, it begins to sample at a preset interval. The temperature probe is read M times to form a dataset containing M temperature readings that reflect the probe's operational status. For example, a preset sampling interval is used. The time interval was 0.1s, and a total of 100 times were recorded.

[0063] P4, according to The cumulative temperature rise S of the temperature probe is calculated, where i is the temperature sampling number. This is the temperature detection value corresponding to the i-th sampling sequence number. This is the preset reference temperature.

[0064] In step P4, the reference temperature The reference temperature is the temperature of the temperature probe in its initial state, typically the ambient temperature where the temperature probe is located. For example, if the ambient temperature is 25°C during step P3, then the reference temperature can be used. The temperature is preset to 25℃. Alternatively, the temperature probe can be used to obtain the initial temperature by reading real-time values ​​before the pressure is fully applied.

[0065] Optionally, the real-time detection value is read from the initial state and compared with the upper and lower detection limits of the temperature probe. If the real-time detection value is the upper or lower detection limit of the temperature probe, an alarm procedure is initiated to rule out short circuits or open circuits. If the real-time detection value is between the lower and upper detection limits, it can be stored as a reference temperature. To calculate the cumulative temperature rise.

[0066] When i=1, t1 is the temperature value obtained from the first reading. The maximum value of i is M, meaning a total of M readings are performed. The unit of cumulative temperature rise S is (°C⋅s). In some embodiments, the temperature value of the Mth reading is 0.3°C higher than the temperature value of the first reading, therefore, according to the formula, the cumulative temperature rise S corresponding to this temperature probe is 1.5 (°C⋅s).

[0067] P5. Compare the cumulative temperature rise S with the preset lower threshold. Comparison: If the cumulative temperature rise S is greater than or equal to the lower threshold... If the cumulative temperature rise S is less than the lower threshold, then proceed with the detection step; If so, an alarm procedure will be initiated.

[0068] Lower threshold This refers to pre-stored data obtained based on experience or statistical methods, and its unit is (°C⋅s).

[0069] This temperature detection method also enables online functional testing of temperature probes during the formation and capacity testing processes of the batteries under test. This is achieved through contact-based heat conduction between the battery and the temperature probe, allowing operators to promptly obtain information on the probe's functionality. Furthermore, this functional testing eliminates the need for specialized equipment, significantly reducing testing time and complexity. Therefore, it does not negatively impact the efficiency of the formation and capacity testing processes, avoids the lag in detecting temperature probe anomalies, reduces invalid tests due to anomalies, and further improves the efficiency and accuracy of both processes.

[0070] Specifically, this lower threshold It can be obtained in the following ways: P01. With the temperature probe functioning normally, change the temperature probe from its initial state to the detection state, and perform sampling at the preset interval. Read a total of M temperature readings and perform a total of N samplings.

[0071] Specifically, a normal operating condition for the temperature probe can be defined as after maintenance or replacement, in which case it can be considered normal. Similarly, the temperature probe is moved to ensure good contact with the surface of the battery under test, and sampling is performed at preset intervals. The temperature probe records a total of M temperature readings, and this sampling is repeated N times. For example, in one embodiment, the first sampling is performed after the battery under test is in place, and consistent with step P3, a preset sampling interval is used. The sampling interval remains the same at 0.1 seconds, and a total of 100 recordings are performed. Then, the same preset sampling interval is used again. The sampling is performed a second time with the number of samples M, until the number of samples reaches N.

[0072] P02, according to The cumulative temperature rise S for a total of N times was calculated.

[0073] Generally, reference temperature It should be consistent with step P3, and should also be maintained at 25°C.

[0074] P03, according to Obtain the lower threshold ,in, Let S be the average of the cumulative temperature rise obtained from N samplings. Let S be the standard deviation of the cumulative temperature rise S obtained from N samplings, and k be a preset confidence coefficient used to control the lower limit threshold. The degree of strictness is determined by a positive number.

[0075] For example, in the above embodiments, the mean The standard deviation is 1.5 (℃⋅s). The lower threshold is 0.1 (℃⋅s). The confidence level is 1.2 (℃⋅s). The confidence coefficient k can be 1, 2, or 3; the larger the value, the higher the confidence level and the lower the false alarm rate. For example, when k=3, the corresponding false alarm rate is approximately 0.15%.

[0076] Of course, based on the cumulative temperature rise value S, a similar cumulative temperature drop value can also be used for further detection. Since the principle is similar, it will not be elaborated on in this invention. If the cumulative temperature drop value is greater than the upper threshold, it indicates that the temperature probe is normal. If the cumulative temperature drop value is not greater than the upper threshold, it indicates that the temperature probe is abnormal, such as being wrapped by foreign objects and unable to dissipate heat properly.

[0077] This invention also provides a temperature detection system for implementing the above-described temperature detection method. Specifically, the temperature detection system includes a limiting device, a temperature detection device, a data processing module, a data storage module, and a timing control module. The limiting device has a preset storage location for accommodating a battery under test. The temperature detection device includes a driving mechanism and a temperature probe. The driving mechanism is connected to the temperature probe and can drive the temperature probe to move towards the battery under test until it contacts the battery. The driving mechanism can also drive the temperature probe away from the battery under test until the temperature probe and the battery are spaced apart. The data processing module, data storage module, and temperature probe are all signal-connected. The data storage module is signal-connected to the data processing module and stores a preset difference range. The data processing module is signal-connected to the temperature probe and reads the measured temperature value from the temperature probe. The data processing module can perform differential calculations on multiple measured temperature values ​​from the same temperature probe and compare the difference obtained through differential calculation with the preset difference range. When the difference falls outside the preset difference range, the data processing module can issue an alarm signal.

[0078] When using the temperature detection system described above, the temperature probe can be switched between its initial state and detection state by moving the drive mechanism. Then, with the coordinated action of the timing control module, data processing module, and data storage module, the temperature can be read and the difference calculated according to the requirements of the temperature detection method described above. When the difference does not fall within the preset difference range that a normal temperature probe should have, it indicates that the temperature probe is malfunctioning and needs to be repaired.

[0079] Therefore, the aforementioned temperature detection system can perform online functional testing of temperature probes during the formation or capacity testing process by utilizing the contact heat conduction between the battery under test and the temperature probe. This allows operators to obtain the functional status of the temperature probes in a timely manner. Simultaneously, this functional testing eliminates the need for specialized testing equipment, significantly reducing testing time and complexity, thus avoiding negative impacts on the efficiency of the formation and capacity testing processes and significantly lowering testing costs. Furthermore, this temperature detection system avoids the lag in detecting temperature probe anomalies, reducing invalid tests caused by temperature probe malfunctions, and further improving the efficiency and accuracy of the formation and capacity testing processes.

[0080] Optionally, in some embodiments, the drive mechanism further includes a position sensor for detecting the relative position of the temperature probe and the battery under test, such as the relative distance between the probe bed and the battery under test in a preset storage location. When the temperature probe contacts the battery under test, it outputs a position detection signal to the timing control module. When the temperature probe moves away from the battery under test and is at a preset distance, it outputs a reset detection signal to the timing control module. The timing control module is signal-connected to the position sensor and starts timing upon receiving the position detection signal or the reset detection signal, and sends a read trigger signal when the timing reaches a preset duration. Through the position sensor, the timing control module can start timing at an appropriate time and accurately read the temperature probe data according to the first preset time T1, the second preset time T2, or the third preset time T3 in the above temperature detection method.

[0081] Of course, in some other embodiments, other types of sensors can be used, such as displacement sensors to detect the movement distance of the drive mechanism, to achieve similar effects. Therefore, the specific trigger signal is not specifically limited in this invention.

[0082] Furthermore, in some embodiments, the temperature detection system further includes an air-blowing cooling device for cooling the temperature probe by blowing air. The air-blowing cooling device is signal-connected to the timing control module and can send a timing signal to the timing control module, which then starts timing in response to the timing signal. Exemplarily, in some embodiments, the air-blowing cooling device includes an electrically controlled valve and a nozzle, which are connected via a pipe and used to control whether the nozzle sprays air or the air flow rate. The electrically controlled valve and the timing control module are signal-connected, enabling the electrically controlled valve to send a timing signal to the timing control module, thus triggering the timing control module to start timing.

[0083] Optionally, in some embodiments, the temperature detection system includes multiple temperature detection devices, each comprising multiple temperature probes. Each temperature detection device is associated with a central control unit, which includes a data processing module, a data storage module, and a timing control module, capable of performing functional tests on all temperature probes of each temperature detection device. Simultaneously, the temperature detection system also includes a host computer, which is signal-connected to multiple central control units. This host computer is responsible for summarizing, statistically analyzing, and presenting the processed data to the operator in a visually intuitive manner, such as tables or graphs, facilitating online testing of all temperature probes in the multiple temperature detection devices.

[0084] More specifically, when using this temperature detection system, such as Figure 3As shown, the battery to be tested is first placed in a preset location, and its position is checked manually or automatically. If correct, a signal is sent to the central control unit to permit the testing step. Upon receiving this signal, the central control unit sends a pressing signal to the needle bed, causing it to move closer to the battery. Simultaneously with the pressing signal (or during the needle bed's movement), the central control unit reads the initial temperature K1 of the temperature probe. As the needle bed moves and the temperature probe and battery reach good contact, the corresponding sensor sends a position detection signal to the central control unit, prompting the central control unit to time the process via a timing control module until the waiting time reaches a first preset time T1. After the first preset time T1, the timing control module sends a waiting completion signal to the central control unit, which then reads the initial testing temperature K2. After obtaining the initial testing temperature K2 and the initial state temperature K1, the difference ΔK1 is calculated internally and compared with a preset first difference range. When ΔK1 falls within the preset first difference range, the detection process can proceed normally. When ΔK1 falls outside the preset first difference range, the alarm process can be initiated.

[0085] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0086] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A temperature detection method, characterized in that, include: The battery under test is placed in a preset storage location, all temperature probes are set to the initial state, and the initial state temperature K1 of each temperature probe is read. The initial state is configured such that the temperature probe and the battery under test are spaced apart. The temperature probe is changed from the initial state to the detection state, and the detection state is configured such that at least one probe portion of the temperature probe comes into contact with the battery under test. Wait for a first preset time T1, and read the initial detection temperature K2 of each temperature probe; The difference ΔK1 between the initial detection temperature K2 and the initial state temperature K1 for each temperature probe is compared with a preset first difference range, wherein, ; If the difference ΔK1 of all the temperature probes falls within the preset first difference range, a detection step is performed; if the difference ΔK1 of at least one temperature probe falls outside the preset first difference range, an alarm step is performed.

2. The temperature detection method according to claim 1, characterized in that, In the initial state, the surface temperature of the battery under test is higher than the actual temperature of the temperature probe.

3. The temperature detection method according to claim 2, characterized in that, The first preset time T1 is 3-8s, and the preset first difference range is 0.1-0.15 degrees Celsius.

4. The temperature detection method according to claim 1, characterized in that, After the detection step is completed, the following is also included: The temperature K3 before separation of each temperature probe is obtained, and the probe and the battery under test are separated. After separation, wait for a second preset time T2 and read the temperature K4 of each temperature probe after separation; The difference ΔK2 between the pre-separation temperature K3 and the post-separation temperature K4 corresponding to each of the temperature probes is compared with a preset second difference range, wherein, If the difference ΔK2 of at least one of the temperature probes falls outside the preset second difference range, an alarm step is triggered.

5. The temperature detection method according to claim 2, characterized in that, Before the battery under test is placed into the preset storage location, all the temperature probes are cooled by blowing air.

6. The temperature detection method according to claim 2, characterized in that, After the detection step is completed, all the temperature probes are cooled by blowing air.

7. The temperature detection method according to claim 5 or 6, characterized in that, Also includes: The temperature K5 of each temperature probe before cooling is obtained before the blowing cooling is performed; The air is blown to cool down according to the third preset time T3, and the temperature K6 after cooling of each temperature probe is read. The difference ΔK3 between the temperature K5 before cooling and the temperature K6 after cooling for each temperature probe is compared with a preset third difference range, wherein, If the difference ΔK3 of at least one of the temperature probes falls outside the preset third difference range, an alarm step is initiated.

8. The temperature detection method according to claim 1, characterized in that, Also includes: Before the temperature probe starts waiting for the first preset time T1, the real-time detection value of the temperature probe is read. If the real-time detection value is the upper or lower limit of the temperature probe, an alarm procedure is initiated.

9. A temperature detection method, characterized in that, include: The battery under test is placed in a preset storage location, all temperature probes are set to the initial state, and the initial state temperature K1 of each temperature probe is read. The initial state is configured such that the temperature probe and the battery under test are spaced apart. The temperature probe is changed from the initial state to the detection state, and the detection state is configured such that at least one probe portion of the temperature probe comes into contact with the battery under test. According to the preset sampling interval Read a total of M temperature readings; according to The cumulative temperature rise S of the temperature probe is calculated, where i is the temperature sampling number. The temperature detection value corresponding to the i-th sampling sequence number. This is the preset reference temperature; The cumulative temperature rise S is compared with a preset lower threshold. If the cumulative temperature rise S is greater than or equal to the lower threshold value, then... If the cumulative temperature rise S is less than the lower threshold, then proceed with the detection step; If so, an alarm procedure will be initiated.

10. The temperature detection method according to claim 9, characterized in that, The lower limit threshold The methods of obtaining it include: When the temperature probe is functioning normally, the temperature probe is changed from the initial state to the detection state, and sampling is performed at preset intervals. The temperature detection values ​​are read a total of M times, and sampling is performed a total of N times; according to The cumulative temperature rise S for a total of N times is calculated respectively; according to Obtain the lower limit threshold ,in, Let S be the average of the cumulative temperature rise obtained from N samplings. Let S be the standard deviation of the cumulative temperature rise S obtained from N samplings, and k be a preset confidence coefficient used to control the lower limit threshold. The degree of strictness is determined by a positive number.

11. The temperature detection method according to claim 9, characterized in that, In the initial state, the real-time detection value of the temperature probe is read. If the real-time detection value is the upper or lower limit of the temperature probe, an alarm procedure is initiated; if the real-time detection value is between the lower and upper limits, it is stored as the reference temperature. .

12. A temperature detection system for implementing the temperature detection method as described in any one of claims 1-11, characterized in that, include: A limiting device is provided with a preset storage position, which is used to limit the storage of the battery to be tested. A temperature detection device includes a driving mechanism and a temperature probe. The driving mechanism is throttledly connected to the temperature probe and can drive the temperature probe to move toward the battery under test until the temperature probe comes into contact with the battery under test. The driving mechanism can also drive the temperature probe to move away from the battery under test until the temperature probe and the battery under test are spaced apart. A data processing module is connected to the temperature probe signal and is used to read the measured temperature value of the temperature probe. The data processing module can perform differential calculation on multiple measured temperature values ​​of the same temperature probe and compare the difference obtained by differential calculation with a preset difference range. When the difference falls outside the preset difference range, the data processing module can issue an alarm signal. A data storage module is signal-connected to the data processing module and is used to store the preset difference range; A timing control module, which is signal-connected to the drive mechanism and the data processing module, is used to send a read trigger signal to the data processing module after a preset time period when the temperature probe contacts and / or leaves the battery under test. The data processing module responds to the read trigger signal to read the measured temperature value.

13. The temperature detection system according to claim 12, characterized in that, The drive mechanism also includes a position sensor for detecting the relative position of the temperature probe and the battery under test. When the temperature probe comes into contact with the battery under test, it outputs a position detection signal to the timing control module; when the temperature probe leaves the battery under test and is separated by a preset distance, it outputs a reset detection signal to the timing control module. The timing control module is connected to the position sensor signal, and starts timing after receiving the position detection signal or the reset detection signal, and sends the read trigger signal when the timing reaches the preset duration.

14. The temperature detection system according to claim 12, characterized in that, Also includes: An air-blowing cooling device is used to cool the temperature probe by blowing air, and the air-blowing cooling device is signal-connected to the timing control module, which can send a timing signal to the timing control module, and the timing control module starts timing in response to the timing signal.

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