Battery module pre-tightening force detection device and method and storage medium

Abstract

The invention relates to a battery module pre-tightening force detection device and method and a storage medium, in the device, a tension assembly is connected with a fastener of a battery module to apply tension to the fastener, so that the fastener is separated from the corresponding side surface of the battery module; the distance measuring module measures the distance from the fastener to the corresponding side surface of the battery module to obtain a measured distance; the processing module is electrically connected with the tension component and the distance measuring module, obtains the measured distance and tension, and obtains the pre-tightening force of the corresponding fastener according to the measured distance and tension, so that the pre-tightening force of the fastener is accurately detected, and the risk that the battery module is excessively bent or the battery cell falls off due to the fact that the fastener is too loose is avoided; the risk that the battery cells are extruded and exploded due to the fact that the expansion force of the single battery cells is too large in the later use process of the battery module due to too tight fasteners is avoided, the accuracy of calculating the pre-tightening force of the fasteners is improved, the tightness degree of the fasteners in the production process of the battery module is consistent, and the reliability and safety of the battery module are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery module preload detection device and method, and a storage medium. Background Art

[0002] The battery module usually includes an end plate and multiple single cells. The end plate and each single cell are bundled to form a battery module by fasteners to fix each single cell. The tightness of the fastener is usually expressed by the preload of the fastener. If the preload of the fastener is too small, the single cell in the middle part is prone to sinking due to gravity when the battery module is suspended in the air, affecting the flatness of the battery module, and may also cause the single cell to slip and fall when the battery module is hoisted; if the preload of the fastener is too large, the single cell is prone to bursting when it expands during the later use of the battery module, and may also cause the conductive bar of the battery module to crack. Therefore, the preload of the fastener is an important process characteristic parameter, which is related to the installation and use reliability of the battery module.

[0003] At present, in the existing fastener assembly of battery modules, pressure is usually applied to the end plates at both ends of the battery module, and the fasteners are put on after squeezing the battery module to a preset distance. The squeezing force on the battery module is then released, and the pre-tightening force of the fastener is estimated based on the squeezing force. This will result in low accuracy of the calculated pre-tightening force of the fastener, inconsistent tightness of the fasteners of the battery module, and affect the reliability and safety of the battery module. Summary of the invention

[0004] Based on this, a battery module preload test device and method, and a storage medium are provided.

[0005] In a first aspect, the present application provides a battery module preload detection device, comprising:

[0006] A tension assembly, the tension assembly is used to connect the fasteners of the battery module to apply tension to the fasteners so that the fasteners are separated from the corresponding side of the battery module;

[0007] A distance measuring module is used to measure the distance from the fastener to the corresponding side of the battery module to obtain a measured distance;

[0008] The processing module is electrically connected to the tension component and the distance measuring module, and the processing module is configured to obtain the measured distance and tension, and obtain the preload force of the corresponding fastener according to the measured distance and tension.

[0009] In one embodiment, the tension component includes a tension hook and a tension sensor;

[0010] The first end of the draw hook is connected to the fastener of the battery module, the second end of the draw hook is connected to the tension sensor, and the tension sensor is electrically connected to the processing module.

[0011] In one embodiment, the tension component is further used to adjust the tension according to the measured distance until the measured distance reaches a preset distance range.

[0012] In one embodiment, the processing module includes a processor and a reminder module, and the processor is connected to the reminder module, the tension component and the distance measurement module;

[0013] The processor is configured to control the reminder module to send a reminder signal when the measured distance reaches a preset distance range.

[0014] In one embodiment, the reminder module includes a buzzer connected to the processor and / or an indicator light connected to the processor.

[0015] In one embodiment, the battery module preload detection device further includes a housing, wherein the tension component, the distance measuring module and the processing module are arranged in the housing; the housing is provided with a through hole, and the connecting end of the tension component is exposed from the through hole; the housing is also provided with a handle;

[0016] And / or, the battery module preload force detection device further includes a human-machine interface module, and the human-machine interface module is connected to the processing module.

[0017] In one of the embodiments, the processing module is further configured to obtain an initial length of the battery module, and based on a first preset preload calculation model, process the initial length, the measured distance and the tension to obtain the preload.

[0018] In one embodiment, the first preset preload force calculation model is established by the following formula:

[0019]

[0020] Where, T is the preload force, k is the preset constant, F is the tension, L is the initial length, and A is the measurement distance.

[0021] In one of the embodiments, the processing module is further configured to obtain the initial length and length change of the battery module, and based on a second preset preload calculation model, process the initial length, length change, measured distance and tension to obtain the preload.

[0022] In one embodiment, the second preset preload force calculation model is established by the following formula:

[0023]

[0024] Wherein, T is the preload force, k is the preset constant, F is the tension, L is the initial length, ΔL is the length change, and A is the measured distance.

[0025] In a second aspect, the present application further provides a battery module preload force detection method, which is applied to any of the battery module preload force detection devices described above, and the battery module preload force detection method comprises the following steps:

[0026] Obtaining the measured distance transmitted by the distance measuring module and the tension transmitted by the tension component;

[0027] According to the measured distance and tension, the preload force of the corresponding fastener is obtained.

[0028] In a third aspect, the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned battery module preload detection method are implemented.

[0029] One of the above technical solutions has the following advantages and beneficial effects:

[0030] The above-mentioned battery module preload detection device includes a tension component, a distance measuring module and a processing module. The tension component is used to connect the fasteners of the battery module to apply tension to the fasteners so that the fasteners are separated from the corresponding side of the battery module; the distance measuring module is used to measure the distance from the fastener to the corresponding side of the battery module to obtain the measured distance; the processing module is electrically connected to the tension component and the distance measuring module, and the processing module is configured to obtain the measured distance and tension, and obtain the preload of the corresponding fastener based on the measured distance and tension, so as to realize accurate detection of the preload of the fasteners of the battery module. The present application uses a tension component to pull the fasteners of the battery module, so that a spacing is formed between the fasteners and the corresponding side surfaces of the battery module, measures the corresponding spacing through a distance measuring module to obtain a measured distance, processes the measured distance and the tension through a processing module, and then accurately and directly measures and calculates the pre-tightening force of the fasteners of the corresponding battery module, thereby avoiding the risk of excessive bending of the battery module during hoisting or falling of the battery cell due to the fasteners being too loose, and avoiding the risk of excessive expansion force of the single battery cell during the later use of the battery module due to the fasteners being too tight, causing the battery cell to burst. The accuracy of calculating the pre-tightening force of the fasteners is improved, so that the tightness of the fasteners is consistent during the production of the battery module, and the reliability and safety of the battery module are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a first structural schematic diagram of a battery module preload force detection device in an embodiment of the present application;

[0032] Figure 2 This is a second structural schematic diagram of the battery module preload force detection device in the embodiment of the present application;

[0033] Figure 3 This is a first circuit diagram of a battery module preload force detection device in an embodiment of the present application;

[0034] Figure 4 This is a second circuit diagram of the battery module preload force detection device in the embodiment of the present application;

[0035] Figure 5 This is a third circuit diagram of the battery module preload force detection device in the embodiment of the present application;

[0036] Figure 6 Schematic diagram of the process of detecting the preload force of a battery module in an embodiment of the present application.

[0037] Reference numerals:

[0038] 10. Tension component; 110. Draw hook; 120. Tension sensor; 20. Distance measurement module; 30. Processing module; 310. Processor; 320. Reminder module; 322. Buzzer; 324. Indicator light; 40. Shell; 50. Human-machine interface module; 60. Battery module; 610. Fastener. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] In addition, the term "plurality" shall mean two or more.

[0042] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] In one embodiment, Figure 1 , Figure 2 and Figure 3 As shown, a battery module preload detection device is provided, including a tension component 10, a distance measuring module 20 and a processing module 30. The tension component 10 is used to connect the fastener 610 of the battery module 60 to apply tension to the fastener 610 so that the fastener 610 is separated from the corresponding side of the battery module 60; the distance measuring module 20 is used to measure the distance from the fastener 610 to the corresponding side of the battery module 60 to obtain the measured distance; the processing module 30 is electrically connected to the tension component 10 and the distance measuring module 20, and the processing module 30 is configured to obtain the measured distance and tension, and obtain the preload of the corresponding fastener 610 according to the measured distance and tension.

[0044] Among them, the battery module 60 may be a square structure, and the battery module 60 may include a battery pack, and the battery pack includes at least two single cells. For example, the battery pack may be composed of each single cell in series and / or in parallel. The single cell may be, but not limited to, a lithium ion cell; for example, the single cell may be a lithium iron phosphate cell, a ternary cell, or a manganese iron lithium cell. The shape of the single cell may be, but not limited to, a square. The battery module 60 also includes at least two end plates, for example, two end plates are arranged between the battery pack. The battery module 60 also includes a fastener 610, and the fastener 610 is an annular belt structure. For example, the fastener 610 may be, but not limited to, a steel belt. The fastener 610 is used to bundle the two end plates and the battery pack to form a square battery module 60, so as to fix the battery pack and the end plate. The corresponding side of the battery module 60 may be a side with a larger area, for example, the corresponding side of the battery module 60 may be a side formed by combining the narrow side surfaces of each single cell.

[0045] The tension component 10 can be connected to the fastener 610 by hook connection. In another example, the tension component 10 can also be connected to the fastener 610 by snap connection or the like. The tension component 10 is used to apply tension to the fastener 610 so that the fastener 610 is disengaged from the corresponding side of the battery module 60, thereby forming a gap between the fastener 610 and the corresponding side of the battery module 60. Exemplarily, the connection between the fastener 610 and the tension component 10 may correspond to the midpoint position of the corresponding side of the battery module 60 along the length direction. When the tension component 10 applies tension to the fastener 610, the tension component 10 and the corresponding side of the battery module 60 form a preset angle. For example, the preset angle may be 90 degrees, that is, the tension component 10 is perpendicular to the corresponding side of the battery module 60, so as to improve the accuracy of measuring the preload force of the fastener 610.

[0046] The distance measuring module 20 is used to measure the distance from the fastener 610 to the corresponding side of the battery module 60. For example, the distance measuring module 20 can be used to process the distance from the connection between the fastener 610 and the tension component 10 to the corresponding side of the battery module 60. In an exemplary embodiment, the distance measuring module 20 can be, but is not limited to, a laser distance measuring module 20 or an infrared distance measuring module 20.

[0047] The processing module 30 is electrically connected to the tension component 10, and when the tension component 10 applies tension to the fastener 610, the tension component 10 can transmit the tension to the processing module 30, and the processing module 30 obtains the current tension data of the tension component 10. Based on the electrical connection between the processing module 30 and the distance measuring module 20, the distance measuring module 20 can transmit the measured distance to the processing module 30, and the processing module 30 obtains the current measured distance of the distance measuring module 20. Further, the processing module 30 can also process the obtained measured distance and tension, and then obtain the pre-tightening force of the corresponding fastener 610 according to the processing result, so as to accurately detect the pre-tightening force of the fastener 610 of the battery module 60, so as to accurately adjust the pre-tightening force of the fastener 610, so that the pre-tightening force of the fastener 610 is within an appropriate range, and avoid the pre-tightening force of the fastener 610 being too large or too small to reduce the reliability of the battery module 60.

[0048] In the above-mentioned embodiment, the tension component 10 is used to connect the fastener 610 of the battery module 60 to apply tension to the fastener 610 so that the fastener 610 is separated from the corresponding side of the battery module 60; the ranging module 20 is used to measure the distance from the fastener 610 to the corresponding side of the battery module 60 to obtain the measured distance; the processing module 30 is electrically connected to the tension component 10 and the ranging module 20, and the processing module 30 is configured to obtain the measured distance and tension, and obtain the pre-tightening force of the corresponding fastener 610 based on the measured distance and tension, so as to realize accurate detection of the pre-tightening force of the fastener 610 of the battery module 60. The present application uses a tension component 10 to pull the fastener 610 of the battery module 60, so that a gap is formed between the fastener 610 and the corresponding side of the battery module 60, and the distance measuring module 20 measures the corresponding gap to obtain a measured distance. The measured distance and the tension are processed by the processing module 30, and then the pre-tightening force of the fastener 610 of the corresponding battery module 60 is accurately and directly measured and calculated, thereby avoiding the risk of the fastener 610 being too loose, causing the battery module 60 to be bent too much during hoisting or the battery cell to fall, and avoiding the risk of the fastener 610 being too tight, causing the single battery cell to expand too much during the later use of the battery module 60, causing the battery cell to burst, thereby improving the accuracy of calculating the pre-tightening force of the fastener 610, so that the tightness of the fastener 610 is consistent during the production process of the battery module 60, and improving the reliability and safety of the battery module 60.

[0049] In one embodiment, Figure 1 and Figure 4 As shown, the tension assembly 10 includes a hook 110 and a tension sensor 120 ; a first end of the hook 110 is connected to the fastener 610 of the battery module 60 , and a second end of the hook 110 is connected to the tension sensor 120 , and the tension sensor 120 is electrically connected to the processing module 30 .

[0050] The hook 110 can be connected to the fastener 610 of the battery module 60 by hooking, so as to apply tension to the fastener 610, so that a gap is formed between the fastener 610 and the corresponding side of the battery module 60. The tension sensor 120 is used to measure the tension value applied by the hook 110 to the fastener 610.

[0051] For example, based on the mechanical connection between the hook 110 and the tension sensor 120, the processing module 30 is electrically connected to the tension sensor 120, and then the operator can apply tension to the tension sensor 120, and then apply tension to the fastener 610 through the hook 110, and the tension sensor 120 detects the tension value applied by the hook 110 to the fastener 610 in real time, and transmits the detected tension to the processing module 30, and then the processing module 30 obtains the current tension data of the hook 110; further, the corresponding distance is measured by the distance measurement module 20 , obtain the measured distance, process the measured distance and the pulling force through the processing module 30, and then accurately and directly measure and calculate the pre-tightening force of the fastener 610 of the corresponding battery module 60, thereby avoiding the risk of the fastener 610 being too loose, causing the battery module 60 to be bent too much during lifting or the battery cell to fall off, and avoiding the risk of the fastener 610 being too tight, causing the single battery cell to expand too much during the later use of the battery module 60, causing the battery cell to burst, thereby improving the accuracy of calculating the pre-tightening force of the fastener 610, and improving the convenience of operation of measuring the pre-tightening force of the fastener 610.

[0052] It should be noted that the processing module 30 is also used to electrically connect the transmission equipment. The processing module 30 can control the transmission equipment to start working, and then apply tension to the tension sensor 120 through the transmission equipment, and then apply tension to the fastener 610 through the hook 110. The tension sensor 120 detects the tension value applied by the hook 110 to the fastener 610 in real time, thereby improving the degree of automation of applying tension to the fastener 610.

[0053] In one embodiment, the tension component 10 is further used to adjust the tension according to the measured distance until the measured distance reaches a preset distance range.

[0054] The preset distance range can be obtained according to the system preset. It should be noted that in order to improve the accuracy of measuring the preload force of the fastener 610, the measuring distance should not be too large or too small, otherwise the calculation result will have a large deviation. For example, the preset distance range can be set to 10 to 30 mm.

[0055] During measurement, the tension component 10 is connected to the fastener 610, and tension is applied to the fastener 610 through the tension component 10, and the distance between the connection between the fastener 610 and the tension component 10 and the corresponding side of the battery module 60 is measured through the distance measuring module 20, so as to obtain the measured distance. If the measured distance does not reach the preset distance range, the tension applied to the fastener 610 is adjusted by the tension component 10, and the current measured distance is measured again by the distance measuring module 20. When the current measured distance reaches the preset distance range, it is determined that the tension output by the tension component 10 at this time is the target tension, and then the processing module 30 obtains the target tension and the current measured distance, and processes the target tension and the current measured distance, so as to accurately obtain the preload force of the corresponding fastener 610.

[0056] For example, the processing module 30 may compare the obtained measured distance with the preset distance range. If the measured distance is greater than the preset distance range, the tension component 10 is controlled to reduce the tension applied to the fastener 610 until the current measured distance reaches the preset distance range. If the measured distance is less than the preset distance range, the processing module 30 controls the tension component 10 to increase the tension applied to the fastener 610 until the current measured distance reaches the preset distance range.

[0057] In the above embodiment, the tension applied by the tension component 10 to the fastener 610 of the battery module 60 is adjusted by measuring whether the distance reaches the preset distance range, thereby obtaining a target tension and a measurement distance that satisfies the preset distance range. The current measurement distance and the target tension are processed by the processing module 30, thereby accurately and directly measuring and calculating the pre-tightening force on the fastener 610 of the corresponding battery module 60, thereby avoiding the risk of the fastener 610 being too loose, causing the battery module 60 to bend too much during hoisting or the battery cell to fall off, and avoiding the risk of the fastener 610 being too tight, causing the single cell to expand too much during the later use of the battery module 60, thereby improving the accuracy of calculating the pre-tightening force of the fastener 610, so that the tightness of the fastener 610 is consistent during the production process of the battery module 60, thereby improving the reliability and safety of the battery module 60.

[0058] In one embodiment, Figure 4 As shown, the processing module 30 includes a processor 310 and a reminder module 320, and the processor 310 is connected to the reminder module 320, the tension component 10 and the distance measuring module 20; the processor 310 is configured to control the reminder module 320 to send a reminder signal when the measured distance reaches a preset distance range.

[0059] The reminder module 320 can be used to send a reminder signal to the user to remind the user whether the distance between the connection between the tension component 10 and the fastener 610 and the corresponding side of the battery module 60 falls within a preset distance range, that is, whether the tension applied by the tension component 10 to the fastener 610 is within an appropriate range. The reminder signal may include a first reminder signal and a second reminder signal.

[0060] For example, based on the processor 310, the reminder module 320, the tension component 10 and the ranging module 20 are respectively connected. By connecting the tension component 10 to the fastener 610, the tension component 10 applies tension to the fastener 610, and transmits the tension data to the processor 310, so that the processor 310 obtains the corresponding tension; the distance between the connection point between the fastener 610 and the tension component 10 and the corresponding side of the battery module 60 is measured by the ranging module 20, so as to obtain the measured distance, and the measured distance is transmitted to the processor 310, so that the processor 310 obtains the corresponding measured distance. The processor 310 compares the measured distance with the preset distance range. If the measured distance does not reach the preset distance range, the control reminder module 320 sends a first reminder signal to remind the user that the measured distance at this time does not meet the requirements, and adjusts the tension applied to the fastener 610 through the tension component 10, and measures the current measured distance again through the distance measurement module 20. Until the current measured distance reaches the preset distance range, the control reminder module 320 sends a second reminder signal to remind the user that the measured distance at this time has met the requirements, and then determines that the tension output by the tension component 10 at this time is the target tension; further, the processing module 30 obtains the target tension and the current measured distance, and processes the target tension and the current measured distance, so as to accurately obtain the preload force of the corresponding fastener 610, thereby improving the convenience of measuring the preload force of the fastener 610.

[0061] In one embodiment, Figure 4 As shown, the reminder module 320 includes a buzzer 322 connected to the processor 310 and / or an indicator light 324 connected to the processor 310 .

[0062] The indicator light 324 can emit lights of different colors, for example, the indicator light 324 can emit red or green light.

[0063] Exemplarily, based on the buzzer 322 and the indicator light 324 being connected to the processor 310 respectively, the processor 310 compares the measured distance with the preset distance range. If the measured distance does not reach the preset distance range, the buzzer 322 is controlled not to make a sound, and the indicator light 324 is controlled to emit a flashing red light to remind the user that the measured distance at this time does not meet the requirements, and the tension component 10 adjusts the tension applied to the fastener 610, and the current measured distance is measured again by the distance measurement module 20. Until the current measured distance reaches the preset distance range, the buzzer 322 is controlled to make a sound, and the indicator light 324 is controlled to emit a flashing green light to remind the user that the measured distance at this time has met the requirements. Then, it is determined that the tension output by the tension component 10 at this time is the target tension; further, the processing module 30 obtains the target tension and the current measurement distance, and processes the target tension and the current measurement distance, so as to accurately obtain the preload force of the corresponding fastener 610, thereby improving the convenience of measuring the preload force of the fastener 610, avoiding the risk of the fastener 610 being too loose, causing the battery module 60 to bend too much during lifting or the battery cell to fall, and avoiding the risk of the fastener 610 being too tight, causing the single cell expansion force to be too large during the later use of the battery module 60, causing the battery cell to burst, so that the tightness of the fastener 610 is consistent during the production process of the battery module 60, thereby improving the reliability and safety of the battery module 60.

[0064] In one embodiment, Figure 1 , Figure 4 and Figure 5 As shown, the preload force detection device of the battery module 60 also includes a shell 40, and the tension component 10, the ranging module 20 and the processing module 30 are arranged in the shell 40; the shell 40 is provided with a through hole, and the connecting end of the tension component 10 is exposed from the through hole; the shell 40 is also provided with a handle; and / or, the preload force detection device of the battery module 60 also includes a human-machine interface module 50, and the human-machine interface module 50 is connected to the processing module 30.

[0065] The housing 40 is provided with a receiving cavity, which can be used to receive the tension component 10, the distance measuring module 20 and the processing module 30; the housing 40 is also provided with a through hole, which is connected to the receiving cavity, and the connecting end of the tension component 10 is exposed through the through hole, so that the tension component 10 is connected to the fastener 610. Exemplarily, the housing 40 is also provided with another through hole, which is connected to the receiving cavity, and the measuring end of the distance measuring module 20 faces the through hole, so that the distance measuring module 20 measures the distance from the connection between the fastener 610 and the tension component 10 to the corresponding side of the battery module 60. In another example, the distance measuring module 20 can also be arranged on the corresponding side of the housing 40, such as the distance measuring module 20 can be arranged on the corresponding side of the housing 40 by means of snap connection or screw connection. The housing 40 is also provided with a handle, so that the operator can hold the handle to apply tension to the housing 40, thereby realizing the application of tension to the fastener 610, and improving the convenience of the preload force measurement operation of the fastener 610.

[0066] The human-machine interface may include a display and a key module, the display and the key module are respectively connected to the processing module 30, and the user can set parameters such as the preset distance range and the length of the battery module 60 by operating the key module. The display can be used to display data such as tension, measurement data, preset distance range and preload force, so that the operator can view the preload force detection result of the fastener 610.

[0067] In one embodiment, the processing module 30 is further configured to obtain an initial length of the battery module 60 , and based on a first preset preload calculation model, process the initial length, the measured distance and the tension to obtain the preload.

[0068] The initial length refers to the length of the corresponding side of the battery module 60 before the battery module 60 is tested (i.e., before the tension is applied to the fastener 610). The initial length is also used to indicate the side length of the fastener 610 corresponding to the corresponding side of the battery module 60 before the tension is applied to the fastener 610.

[0069] The first preset preload calculation model can be established by historical test data. For example, the first preset preload calculation model can be established by performing multiple tests on the sample battery module 60. In one example, the first preset preload calculation model can be established by the following formula: Where, T is the preload force, k is the preset constant, F is the tension, L is the initial length, and A is the measurement distance.

[0070] The initial length, the measured distance and the tension are input into the first preset preload calculation model for processing, thereby obtaining the preload of the corresponding fastener 610. It should be noted that the preset constant k is a constant value obtained by the ratio between the preload of the fastener 610 measured by the tension sensor 120 and the measured value.

[0071] In the above-mentioned embodiment, the initial length of the corresponding side of the battery module 60 is measured; the tension component 10 applies tension to the fastener 610 of the battery module 60, so that a spacing is formed between the fastener 610 and the corresponding side of the battery module 60, and the corresponding spacing is measured by the distance measuring module 20 to obtain the measured distance; the processing module 30 inputs the initial length, the measured distance and the tension into the first preset preload calculation model for processing, and then accurately and directly measures and calculates the preload of the fastener 610 of the corresponding battery module 60, thereby avoiding the risk of the fastener 610 being too loose, causing the battery module 60 to bend too much during hoisting or the battery cell to fall off, and avoiding the risk of the fastener 610 being too tight, causing the single battery cell to expand too much during the later use of the battery module 60, causing the battery cell to burst, thereby improving the accuracy of calculating the preload of the fastener 610, so that the tightness of the fastener 610 is consistent during the production process of the battery module 60, and improving the reliability and safety of the battery module 60.

[0072] In one embodiment, the processing module 30 is further configured to obtain the initial length and length change of the battery module 60, and based on a second preset preload calculation model, process the initial length, length change, measured distance and tension to obtain the preload.

[0073] The length change refers to the length change of the corresponding side surface of the battery module 60 from before to after the tension is applied to the fastener 610 .

[0074] The second preset preload calculation model can be established by historical test data. For example, the second preset preload calculation model can be established by performing multiple tests on the sample battery module 60. In one example, the second preset preload calculation model can be established by the following formula: Wherein, T is the preload force, k is the preset constant, F is the tension, L is the initial length, ΔL is the length change, and A is the measured distance.

[0075] The initial length, length change, measured distance and tension are input into the second preset preload calculation model for processing, thereby obtaining the preload of the corresponding fastener 610. It should be noted that the length change can be obtained by measuring the initial length and the final length of the corresponding side of the battery module 60 before and after the tension is applied to the fastener 610, and performing difference processing on the initial length and the final length.

[0076] In the above-mentioned embodiment, the initial length of the corresponding side of the battery module 60 is measured; the tension component 10 applies tension to the fastener 610 of the battery module 60, so that a spacing is formed between the fastener 610 and the corresponding side of the battery module 60, and the distance measuring module 20 measures the corresponding spacing to obtain the measured distance, and measures the terminal length of the corresponding side of the battery module 60, and then obtains the length change according to the initial length and the terminal length; the processing module 30 inputs the initial length, the length change, the measured distance and the tension into the second preset preload calculation model for processing. The pre-tightening force of the fastener 610 of the corresponding battery module 60 is accurately and directly measured and calculated, thereby avoiding the risk of excessive bending of the battery module 60 during lifting or falling of the battery cell due to the fastener 610 being too loose, and avoiding the risk of excessive expansion force of the single battery cell causing the battery cell to burst during the later use of the battery module 60 due to the fastener 610 being too tight, further improving the accuracy of calculating the pre-tightening force of the fastener 610, so that the tightness of the fastener 610 is consistent during the production process of the battery module 60, thereby improving the reliability and safety of the battery module 60.

[0077] In one embodiment, Figure 6 As shown, a battery module preload detection method is also provided, which is applied to any of the battery module preload detection devices as described above, and the battery module preload detection method comprises the following steps:

[0078] Step S610, obtaining the measured distance transmitted by the distance measuring module and the tension transmitted by the tension component.

[0079] When the tension component applies tension to the fastener, the tension component can transmit the tension to the processing module, and the processing module obtains the current tension data of the tension component. The distance measuring module can transmit the measured distance to the processing module, and the processing module obtains the current measurement distance of the distance measuring module.

[0080] Step S620, obtaining the preload force of the corresponding fastener according to the measured distance and the tension.

[0081] The processing module can process the obtained measured distance and tension, and then obtain the pre-tightening force of the corresponding fastener according to the processing result, so as to accurately detect the pre-tightening force of the fastener of the battery module, so as to accurately adjust the pre-tightening force of the fastener so that the pre-tightening force of the fastener is within an appropriate range, avoiding the pre-tightening force of the fastener being too large or too small to reduce the reliability of the battery module.

[0082] In the above-mentioned embodiment, the fasteners of the battery module are pulled by the tension component to form a spacing between the fasteners and the corresponding side surfaces of the battery module, the corresponding spacing is measured by the distance measuring module to obtain the measured distance, and the measured distance and the tension are processed by the processing module, thereby accurately and directly measuring and calculating the pre-tightening force of the fasteners of the corresponding battery module, thereby avoiding the risk of excessive bending of the battery module during hoisting or falling of the battery cell due to the fasteners being too loose, and avoiding the risk of excessive expansion force of the single battery cell during the later use of the battery module due to the fasteners being too tight, causing the battery cell to burst. The accuracy of calculating the pre-tightening force of the fasteners is improved, so that the tightness of the fasteners is consistent during the production of the battery module, thereby improving the reliability and safety of the battery module.

[0083] In one embodiment, step S620 further includes: obtaining an initial length of the battery module, and processing the initial length, the measured distance and the tension based on a first preset preload calculation model to obtain the preload.

[0084] The initial length refers to the length of the corresponding side of the battery module before the battery module is tested (i.e. before the tension is applied to the fastener). The initial length is also used to indicate the side length of the fastener corresponding to the corresponding side of the battery module before the tension is applied to the fastener.

[0085] The first preset preload calculation model can be established by historical test data. For example, the first preset preload calculation model can be established by performing multiple tests on the sample battery module. In one example, the first preset preload calculation model can be established by the following formula: Wherein, T is the preload force, k is the preset constant, F is the tension force, L is the initial length, and A is the measurement distance. It should be noted that the preset constant k is a constant value obtained by the ratio between the preload force of the fastener measured by the tension sensor and the measured value.

[0086] By inputting the initial length, measurement distance and tension into the first preset preload calculation model for processing, the preload of the fasteners of the corresponding battery module can be accurately and directly measured and calculated, thereby avoiding the risk of excessive bending of the battery module during lifting or falling of the battery cells due to the fasteners being too loose, and the risk of excessive expansion force of the single battery cells during the later use of the battery module due to the fasteners being too tight, causing the battery cells to burst. The accuracy of calculating the preload of the fasteners is improved, the tightness of the fasteners is consistent during the production of the battery modules, and the reliability and safety of the battery modules are improved.

[0087] In one embodiment, step S620 further includes: obtaining the initial length and length change of the battery module, and processing the initial length, length change, measurement distance and tension based on a second preset preload calculation model to obtain the preload.

[0088] The length change refers to the length change of the corresponding side of the battery module from before the tension is applied to the fastener to after the tension is applied.

[0089] The second preset preload calculation model can be established by historical test data. For example, the second preset preload calculation model can be established by performing multiple tests on the sample battery module. In one example, the second preset preload calculation model can be established by the following formula: Wherein, T is the preload force, k is the preset constant, F is the tension, L is the initial length, ΔL is the length change, and A is the measured distance. It should be noted that the length change can be obtained by measuring the initial length and the final length of the corresponding side of the battery module before and after applying tension to the fastener, and performing difference processing on the initial length and the final length.

[0090] By inputting the initial length, length change, measurement distance and tension into a second preset preload calculation model for processing, the preload of the fasteners of the corresponding battery module can be accurately and directly measured and calculated, thereby avoiding the risk of excessive bending of the battery module during lifting or falling of the battery cells due to the fasteners being too loose, and avoiding the risk of excessive expansion force of the single battery cells during the later use of the battery module due to the fasteners being too tight, causing the battery cells to burst. The accuracy of calculating the preload of the fasteners is further improved, so that the tightness of the fasteners is consistent during the production of the battery modules, thereby improving the reliability and safety of the battery modules.

[0091] It should be understood that although Figure 6 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 6 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0092] In one embodiment, the present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the above-mentioned battery module preload force detection method are implemented.

[0093] For example, a computer program, when executed by a processor, performs the following steps:

[0094] The measured distance transmitted by the distance measuring module and the tension transmitted by the tension component are obtained; and the preload force of the corresponding fastener is obtained according to the measured distance and the tension.

[0095] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing related hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned division operation methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0096] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery module preload detection device, characterized in that: include: A tension component, the tension component is used to connect the fasteners of the battery module to apply tension to the fasteners so that the fasteners are separated from the corresponding side of the battery module; A distance measuring module, the distance measuring module is used to measure the distance from the fastener to the corresponding side surface of the battery module to obtain a measured distance; A processing module is electrically connected to the tension component and the distance measuring module, and is configured to obtain the measured distance and the tension, and obtain a preload corresponding to the fastener according to the measured distance and the tension.

2. The battery module preload detection device according to claim 1, characterized in that: The tension component includes a tension hook and a tension sensor; The first end of the hook is connected to the fastener of the battery module, the second end of the hook is connected to the tension sensor, and the tension sensor is electrically connected to the processing module.

3. The battery module preload detection device according to claim 1, characterized in that: The tension component is also used to adjust the tension according to the measured distance until the measured distance reaches a preset distance range.

4. The battery module preload detection device according to claim 3, characterized in that: The processing module includes a processor and a reminder module, and the processor is connected to the reminder module, the tension component and the distance measurement module; The processor is configured to control the reminder module to send a reminder signal when the measured distance reaches a preset distance range.

5. The battery module preload detection device according to claim 4, characterized in that: The reminder module includes a buzzer connected to the processor and / or an indicator light connected to the processor.

6. The battery module preload detection device according to claim 1, characterized in that: It also includes a shell, the tension component, the distance measurement module and the processing module are arranged in the shell; the shell is provided with a through hole, and the connecting end of the tension component is exposed from the through hole; the shell is also provided with a handle; And / or, it also includes a human-machine interface module, and the human-machine interface module is connected to the processing module.

7. The battery module preload detection device according to any one of claims 1 to 6, characterized in that: The processing module is further configured to obtain an initial length of the battery module, and based on a first preset preload calculation model, process the initial length, the measured distance and the tension to obtain the preload.

8. The battery module preload detection device according to claim 7, characterized in that: The first preset preload calculation model is established by the following formula: Wherein, T is the preload force, k is a preset constant, F is the tension, L is the initial length, and A is the measurement distance.

9. The battery module preload detection device according to any one of claims 1 to 6, characterized in that: The processing module is also configured to obtain the initial length and length change of the battery module, and based on a second preset preload calculation model, process the initial length, the length change, the measured distance and the tension to obtain the preload.

10. The battery module preload detection device according to claim 9, characterized in that: The second preset preload calculation model is established by the following formula: Wherein, T is the preload force, k is a preset constant, F is the tension, L is the initial length, ΔL is the length change, and A is the measurement distance.

11. A battery module preload detection method, characterized in that: Applied to the battery module preload force detection device according to any one of claims 1 to 10, the battery module preload force detection method comprises the following steps: Obtaining the measured distance transmitted by the distance measuring module and the tension transmitted by the tension component; The preload force corresponding to the fastener is obtained according to the measured distance and the tension.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the steps of the battery module preload detection method according to claim 11 are implemented.

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