Battery detection device, battery module and vehicle
By using rigid components and stress detection components during battery assembly, the stress distribution of the cell module is detected, solving the problem of difficulty in determining cell alignment and improving battery quality and safety.
Patent Information
- Application Number
- CN202422585844.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-10-24
AI Technical Summary
In existing technologies, it is difficult to determine whether the cells are aligned during the battery production and assembly process, which affects battery quality.
Rigid components and stress detection components are used. The alignment of the battery cell module is determined by detecting the stress at different positions of the rigid components. Stress data is obtained using components such as magnetic induction coils, piezoelectric sheets, and resonant detection devices.
It enables alignment detection of battery cell modules, ensuring cell alignment and improving battery quality and safety.
Smart Images
Figure CN223501952U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, specifically to battery testing devices, battery modules, and vehicles. Background Technology
[0002] Batteries, especially prismatic batteries, are typically formed by stacking multiple cells together. During the battery production and assembly process, it is necessary to ensure the alignment of the cells as much as possible to guarantee battery quality.
[0003] In related technologies, the main focus is on aligning the battery cells as much as possible during the stacking and arrangement process. However, there is a lack of detection methods to determine whether the battery cells are aligned, making it difficult to ascertain whether the cells are aligned. Utility Model Content
[0004] Embodiments of this application provide a battery testing device, a battery, and a vehicle, which can improve the technical problem of difficulty in determining whether battery cells are aligned.
[0005] In a first aspect, embodiments of this application provide a battery detection device, comprising:
[0006] A rigid component, adapted to be sleeved on the battery cell module and attached to the outer wall surface of the battery cell module, the battery cell module comprising a plurality of battery cells arranged in sequence;
[0007] A stress detection component is connected to one side of the outer surface of the rigid component. The stress detection component is used to detect the stress at at least two different locations of the rigid component to determine the alignment of the cell module.
[0008] In one embodiment, the stress detection assembly includes a magnetic induction coil and two magnetic components disposed opposite to each other. Both magnetic components are mounted on the outer wall surface of the rigid assembly, and the magnetic induction coil is located between the two magnetic components.
[0009] In one embodiment, the rigid component includes at least two rigid members, both of which are sleeved on the battery cell module, and the stress detection component is connected to the outer wall surface of each rigid member.
[0010] In one embodiment, the ratio of the distance between the different rigid members to the height of the battery cell module is between 0.3 and 0.7.
[0011] In one embodiment, at least two of the rigid members include a first rigid member and a second rigid member. The battery cell module includes a first end face and a second end face disposed opposite to each other. Along the height direction of the battery cell module, the first end face, the first rigid member, the second rigid member, and the second end face are sequentially distributed, wherein...
[0012] The ratio of the distance between the first rigid member and the first end face to the height of the battery cell module is between 0.1 and 0.3.
[0013] The ratio of the distance between the second rigid member and the second end face to the height of the battery cell module is between 0.1 and 0.3.
[0014] In one embodiment, the stress detection components at two adjacent rigid members are symmetrically distributed about the two adjacent rigid members.
[0015] In one embodiment, at least two of the rigid members are arranged along the height direction of the battery cell module, and the orthographic projections of the stress detection components on the at least two of the rigid members along the height direction of the battery cell module at least partially overlap.
[0016] In one embodiment, the rigid member includes a first rigid part, a second rigid part, a third rigid part, and a fourth rigid part connected in sequence. The first rigid part and the third rigid part are arranged opposite each other and have the same length. The second rigid part and the fourth rigid part are arranged opposite each other and have the same length. The length of the first rigid part is less than the length of the second rigid part. The stress detection component is connected at the middle position of the second rigid part and / or the fourth rigid part.
[0017] In one embodiment, the stress detection assembly includes a control component and at least two piezoelectric elements attached to different locations of the rigid assembly. The piezoelectric elements are electrically connected to the control component, which is configured to determine the stress at different locations of the rigid assembly based on the voltage of the different piezoelectric elements.
[0018] In one embodiment, the piezoelectric sheet is disposed on the second rigid portion or the fourth rigid portion, and a plurality of the battery cells of the battery cell module are arranged sequentially along the length direction of the second rigid portion, with the connection point of at least two adjacent battery cells facing the piezoelectric sheet.
[0019] Secondly, embodiments of this application provide a battery module, including a cell module and a battery detection device as described above, wherein the rigid component is sleeved on the cell module.
[0020] Thirdly, embodiments of this application provide a vehicle including the battery module described above.
[0021] The beneficial effects of the embodiments of this application are as follows:
[0022] In the embodiments of this application, a stress detection component detects the stress at at least two different locations of a rigid component. When the stress at different locations of the rigid component is the same or the difference is within a preset value, it indicates that the multiple cells of the battery module are aligned with each other. When the stress at different locations of the rigid component is different or the difference is greater than the preset value, it indicates that the multiple cells of the battery module are not aligned with each other. In other words, this application detects the stress at different locations of the rigid component using a stress detection component, and by comparing the stress values at different locations, the stress uniformity of the battery module can be obtained, and it can be determined whether the multiple cells of the battery module are aligned with each other, thus realizing the detection of the alignment degree of the battery module. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is one of the structural schematic diagrams of the battery detection device provided in the embodiments of this application;
[0025] Figure 2 This is a second schematic diagram of the battery detection device provided in the embodiments of this application;
[0026] Figure 3 This is one of the top views of the battery detection device provided in the embodiments of this application;
[0027] Figure 4 This is a second top view of the battery detection device provided in the embodiments of this application;
[0028] Figure 5 This is the third schematic diagram of the battery detection device provided in the embodiments of this application;
[0029] Figure 6 This is a flowchart of a battery alignment detection method provided in an embodiment of this application. Detailed Implementation
[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.
[0031] The following is combined with Figures 1 to 6 This application describes the battery testing device, battery module, and vehicle.
[0032] According to the embodiments of the first aspect of this application, such as Figure 1 , Figure 2 and Figure 3 The battery testing device includes a rigid component 2 and a stress detection component 3. The rigid component 2 is adapted to be sleeved on the cell module 1 and attached to the outer wall of the cell module 1. The cell module 1 includes a plurality of cells arranged in sequence. The stress detection component 3 is connected to one side of the outer surface of the rigid component 2. The stress detection component 3 is used to detect the stress at at least two different positions of the rigid component 2 in order to determine the alignment of the cell module 1.
[0033] According to the battery testing device of this application embodiment, the rigid component 2 is sleeved on the outer wall of the cell module 1. The rigid component 2 can fasten multiple cells of the cell module 1. At the same time, under the action of the cell module 1, the rigid component 2 will also generate corresponding stress.
[0034] When the multiple cells of the battery module 1 are neatly arranged, i.e., aligned, the force exerted by the battery module 1 on the rigid component 2 will be uniform. The stress detection component 3 detects the stress at at least two different locations on the rigid component 2. If the stress at different locations on the rigid component 2 is the same or the difference is within a preset value, it indicates that the multiple cells of the battery module 1 are aligned. If the stress at different locations on the rigid component 2 is different or the difference is greater than the preset value, it indicates that the multiple cells of the battery module 1 are not aligned. In other words, this application uses the stress detection component 3 to detect the stress at different locations on the rigid component 2, and by comparing the stress values at different locations, the uniformity of the force on the battery module 1 can be obtained, thus determining whether the multiple cells of the battery module 1 are aligned and achieving the detection of the alignment degree of the battery module 1.
[0035] In some examples, the stress detection component 3 can be attached to the outer surface of the rigid component 2 to detect the stress of the rigid component 2. The stress detection component 3 can also be spaced apart from the rigid component 2, and the stress detection component 3 detects the stress of the rigid component 2 by emitting a corresponding detection medium into the rigid component 2.
[0036] In one embodiment of this application, such as Figure 4 and Figure 5 The stress detection component 3 includes at least two detection elements 31, which are respectively connected to different positions of the rigid component 2. The detection elements 31 are used to detect the stress of the rigid component 2.
[0037] Understandably, different detection elements 31 are connected to different positions of the rigid component 2, allowing each element to detect stress at different locations. The detection data from different elements 31 are compared. If the data are the same or the difference is within a preset value, it indicates that the multiple cells of the battery module 1 are aligned. If the data are different or the difference is greater than the preset value, it indicates that the multiple cells of the battery module 1 are not aligned, thus achieving the detection of the alignment of the multiple cells in the battery module 1.
[0038] In some examples, the rigid component 2 may include two or more rigid elements 21. At least two detection elements 31 may be connected to different rigid elements 21, or to different locations on the same rigid element 21.
[0039] In some embodiments, the stress detection component 3 includes a plurality of detection elements 31, which are uniformly distributed along the circumference of the rigid component 2 on the outer wall surface of the rigid component 2.
[0040] Understandably, multiple detection components 31 can detect the stress at multiple locations of the rigid component 2, achieving comprehensive detection of the stress in the rigid component 2. This allows for more accurate determination of the uniformity of stress on the rigid component 2 and improves the accuracy of detecting the alignment of multiple cells in the cell module 1.
[0041] In some examples, when one of the multiple cells in the cell module 1 protrudes beyond the other cells, the stress detected by the nearby detection element 31 will be higher. If the detection data of some of the multiple detection elements 31 is higher than normal, it indicates that the multiple cells in the cell module 1 are not aligned, and that the cells corresponding to the positions of those detection elements 31 are not properly arranged. Therefore, while detecting the alignment of the cells, the position of the cells that need adjustment can also be determined.
[0042] In some embodiments, the detection element 31 includes a resonance detection element connected to the side of the rigid component 2 away from the cell module 1. The resonance detection element is used to detect the shift of the resonance peak of the rigid component 2 in order to determine the stress of the rigid component 2.
[0043] It is understandable that when the length of rigid component 2 changes, the shift of its own resonant peak will also change accordingly. Therefore, when the shift of the resonant peak of rigid component 2 is detected, the change in the length of rigid component 2 can be deduced. The change in the length of rigid component 2, i.e., the strain of rigid component 2, is related to the stress of rigid component 2. Therefore, the stress of rigid component 2 can be determined based on the change in its length; in other words, the stress of rigid component 2 can be calculated based on the shift of its resonant peak.
[0044] Different resonance detection devices can detect the shift of the resonance peak at different positions of the rigid component 2. That is, by using the detection data of different resonance detection devices, the stress at different positions of the rigid component 2 can be determined. Then, the stress at different positions of the rigid component 2 can be compared to obtain the stress uniformity of the cell module 1, so as to determine whether the multiple cells of the cell module 1 are aligned with each other, thus realizing the detection of the alignment degree of the cell module 1.
[0045] It is understood that in this embodiment, the stress of the rigid component 2 can be obtained by detecting the shift of the resonance peak of the rigid component 2 through the resonance detection device, which reduces the complexity of stress detection of the rigid component 2.
[0046] In some examples, the resonance detection device includes a resonator, which can detect the shift of the resonance peak of the rigid component 2, so as to determine the stress of the rigid component 2 based on the shift of the resonance peak. The alignment of the battery module can be judged based on the stress at different positions of the rigid component 2, thus realizing the detection of the battery module.
[0047] Specifically, the resonant detection device includes at least two resonators, which are symmetrically distributed about the centerline of the rigid component 2.
[0048] It is understandable that the two resonators are symmetrically distributed about the centerline of the rigid component 2, meaning that the positions where the rigid component 2 is connected to the two resonators are also symmetrical. Therefore, when the multiple cells of the cell module 1 are aligned with each other, the strain at the positions where the rigid component 2 is connected to the two resonators should be the same, meaning the detection data of the two resonators should be the same. Thus, by determining whether the detection data of the two resonators are the same, it can be determined whether the multiple cells of the cell module 1 are aligned.
[0049] The stress detection component includes a control component electrically connected to the resonator, and the control component is configured to determine the stress of the rigid component 2 based on the shift of the resonant peak of the rigid component 2.
[0050] Understandably, the resonator transmits the detection data to the control unit, that is, it transmits the offset data of the resonant peak of the rigid component 2 to the control unit. The control unit can calculate the stress of the rigid component 2 based on the offset of the resonant peak of the rigid component 2, so as to complete the conversion between the offset of the resonant peak and the stress.
[0051] In some examples, the control unit can store the corresponding conversion relationship in advance. Specifically, a resonator can be set at the rigid component 2 of the first battery cell module 1, and a stress sensor can be set at the rigid component 2 of the second battery cell module 1. The first battery cell module 1 and the second battery cell module 1 are identical. Then, the offset of the resonance peak detected by the resonator can be correlated with the stress detected by the stress sensor, and the correspondence can be stored in the control unit. This allows the control unit to determine the stress corresponding to the rigid component 2 when it receives the offset data of the resonance peak of the rigid component 2.
[0052] In some examples, the resonance detection element includes a capacitive sensor attached to the outer wall of the rigid component 2. The capacitive sensor is electrically connected to a control component, which is configured to determine the shift of the resonance peak of the rigid component 2 based on the detection data from the capacitive sensor.
[0053] Understandably, the capacitive sensor transmits the detected data to the control unit. The control unit compares and calculates the detection data from the capacitive sensor at different times or under different conditions to determine whether the resonant frequency of the rigid component 2 has shifted, and by what amount. In other words, through the cooperation of the capacitive sensor and the control unit, the shift in the resonant peak of the rigid component 2 can be detected.
[0054] In one embodiment of this application, the detection element 31 includes a strain gauge, which is attached to the side of the rigid component 2 away from the cell module 1. The strain gauge is used to detect the strain of the rigid component 2 in order to determine the stress of the rigid component 2.
[0055] Understandably, strain gauges can be used to detect the strain of rigid component 2, so as to determine the stress of rigid component 2 based on the strain. Different strain gauges are used to detect different positions of rigid component 2, and based on the detection data of different strain gauges, the uniformity of stress on rigid component 2 can be determined, so as to determine whether the multiple cells of battery module 1 are aligned with each other.
[0056] In one embodiment of this application, the stress detection component includes a control component and at least two piezoelectric sheets. The at least two piezoelectric sheets are attached to different positions of the rigid component 2. The piezoelectric sheets are electrically connected to the control component. The control component is configured to determine the stress at different positions of the rigid component 2 based on the voltage of the different piezoelectric sheets.
[0057] Understandably, when the rigid component 2 deforms, the voltage of the piezoelectric element will also change. Since the piezoelectric element is electrically connected to the control component, the control component can acquire the voltage data of the piezoelectric element and then determine the strain of the rigid component 2 based on the voltage of the piezoelectric element, thereby determining the stress of the rigid component 2 based on the strain. Furthermore, based on different voltages of the piezoelectric element, the stress at different locations of the rigid component 2 can be determined, thus facilitating the determination of the alignment of the battery cell module 1.
[0058] In one embodiment of this application, the stress detection component includes a magnetic induction coil and two magnetic elements disposed opposite to each other. Both magnetic elements are mounted on the outer wall surface of the rigid component 2, and the magnetic induction coil is located between the two magnetic elements.
[0059] It is understandable that a magnetic field can be formed between two magnetic components, and a magnetic induction coil positioned between the two components can output corresponding induction data. When rigid component 2 is subjected to force, it will deform. This deformation of rigid component 2 will cause a change in the distance between the two magnetic components, resulting in a change in the magnetic flux through the magnetic induction coil. Consequently, the induction data of the magnetic induction coil will also change. Therefore, the strain of rigid component 2 can be determined using the induction data, and the stress of rigid component 2 can be determined based on the strain, thus enabling stress detection of rigid component 2.
[0060] In one embodiment of this application, such as Figure 5 The rigid component 2 includes at least two rigid members 21, both of which are sleeved on the cell module 1, and each rigid member 21 has a stress detection component 3 connected to its outer wall surface.
[0061] It is understandable that when multiple cells of the battery module 1 are neatly arranged, the stress of different rigid components 21 is the same or the difference is within a preset value. In this embodiment, stress detection components 3 are provided at different rigid components 21. That is, the stress detection components 3 can detect the stress of different rigid components 21, determine whether the stress of different rigid components 21 is the same, and thus determine whether the multiple cells of the battery module 1 are aligned.
[0062] It is understandable that the rigid member 21 is attached to the outer wall of the cell module 1, meaning that the rigid member 21 can fasten multiple cells of the cell module 1. By setting at least two rigid members 21 and both being fitted onto the cell module 1, the fastening effect on the multiple cells of the cell module 1 is improved.
[0063] By setting a stress detection component 3 at each rigid component 21, the strain of each rigid component 21 can be detected. When the strain of each rigid component 21 is obtained, the alignment of the battery cells at different positions of the battery cell module 1 can be judged according to the position of the stress detection component 3 of different rigid components 21.
[0064] In some examples, the rigid component 21 is, for example, a steel strip or an aluminum strip. It should be noted that this is only an example of the rigid component 21 and does not impose any specific limitations on it.
[0065] In some embodiments, the ratio of the distance between the different rigid members 21 to the height of the battery cell module 1 is between 0.3 and 0.7.
[0066] Understandably, if the ratio of the distance between different rigid components 21 to the height of the battery cell module 1 is less than 0.3, it indicates that the distance between the different rigid components 21 is too close. The rigid components 21 will be less affected by the alignment state of the battery cell module 1, meaning the stress of the rigid components 21 will be relatively small. This is not conducive to detecting the stress of the rigid components 21, nor is it conducive to determining the alignment state of the battery cell module 1 based on the stress of the rigid components 21. If the ratio of the distance between different rigid components 21 to the height of the battery cell module 1 is greater than 0.7, it indicates that the distance between the different rigid components 21 is too far. In this case, using the stress of the different rigid components 21 to judge the alignment of the battery cell module 1 is prone to misjudgment. Therefore, this application sets the ratio of the distance between different rigid components 21 to the height of the battery cell module 1 between 0.3 and 0.7.
[0067] In some embodiments, at least two rigid members 21 include a first rigid member and a second rigid member, and the battery cell module 1 includes a first end face and a second end face disposed opposite to each other. Along the height direction of the battery cell module 1, the first end face, the first rigid member, the second rigid member, and the second end face are sequentially distributed.
[0068] The ratio of the distance between the first rigid member and the first end face to the height of the battery cell module 1 is between 0.1 and 0.3.
[0069] The ratio of the distance between the second rigid member and the second end face to the height of the battery cell module 1 is between 0.1 and 0.3.
[0070] It is understandable that if the ratio of the distance between the first rigid member and the first end face to the height of the battery cell module 1 is less than 0.1, and the ratio of the distance between the second rigid member and the second end face to the height of the battery cell module 1 is less than 0.1, it will increase the difficulty of fitting the first rigid member and the second rigid member 21. If the ratio of the distance between the first rigid member and the first end face to the height of the battery cell module 1 is greater than 0.3, and the ratio of the distance between the second rigid member and the second end face to the height of the battery cell module 1 is greater than 0.3, then the first rigid member and the second rigid member 21 will have difficulty effectively fastening the battery cell module 1. Therefore, this application sets the ratio of the distance between the first rigid member and the first end face to the height of the battery cell module 1 between 0.1 and 0.3, and sets the ratio of the distance between the second rigid member and the second end face to the height of the battery cell module 1 between 0.1 and 0.3.
[0071] In the embodiments of this application, at least two rigid members 21 are arranged along the height direction of the cell module 1, and the orthographic projections of the stress detection components 3 on the at least two rigid members 21 along the height direction of the cell module 1 at least partially overlap.
[0072] It is understandable that if the stress detection components 3 on at least two rigid members 21 are set to have at least partial overlap in their orthogonal projection along the height direction of the cell module 1, then when the multiple cells of the cell module 1 are neatly arranged, that is, when the multiple cells are aligned with each other, the stress detected by the stress detection components 3 on at least two rigid members 21 is the same or the difference is less than a threshold. Then, by comparing the detection data of the stress detection components 3 on at least two rigid members 21, it can be determined whether the multiple cells of the cell module 1 are aligned.
[0073] In the embodiments of this application, the stress detection components 3 at two adjacent rigid members 21 are symmetrically distributed about the adjacent rigid members 21. It can be understood that by symmetrically arranging the stress detection components 3 at at least two rigid members 21, when the multiple cells of the cell module 1 are neatly arranged, that is, when the multiple cells are aligned with each other, the stress detected by the stress detection components 3 at two adjacent rigid members 21 is the same. Therefore, by judging whether the detection data of the stress detection components 3 at two adjacent rigid members 21 are the same, it can be determined whether the multiple cells of the cell module 1 are aligned.
[0074] When multiple cells of the battery module 1 are neatly arranged, the deformation of different positions of the rigid component 21 may vary, meaning that the stress at different positions of the rigid component 21 will have slight differences. If the stress detection components 3 at two adjacent rigid components 21 are staggered, a reasonable preset difference needs to be determined in advance. The difference in the detection data of the stress detection components 3 at two adjacent rigid components 21 is then compared with the preset difference to determine whether the multiple cells of the battery module 1 are aligned. In this embodiment, by symmetrically arranging the stress detection components 3 at adjacent rigid components 21, the alignment of the multiple cells of the battery module 1 can be determined directly by comparing the detection data of the stress detection components 3 at adjacent rigid components 21, which is much simpler.
[0075] In one embodiment of this application, such as Figure 4 The rigid member 21 includes a first rigid part 211, a second rigid part 212, a third rigid part 213 and a fourth rigid part 214 connected in sequence. The first rigid part 211 and the third rigid part 213 are arranged opposite each other and have the same length. The second rigid part 212 and the fourth rigid part 214 are arranged opposite each other and have the same length. The length of the first rigid part 211 is less than the length of the second rigid part 212. The stress detection component 3 is connected at the middle position of the second rigid part 212 and / or the fourth rigid part 214.
[0076] Understandably, the first rigid part 211, the second rigid part 212, the third rigid part 213, and the fourth rigid part 214 are connected end to end to form a rigid member 21. All four rigid parts are in contact with the outer wall of the battery cell module 1. Since the second rigid part 212 and the fourth rigid part 214 are longer, the stress at these locations is greater than that at the first rigid part 211 and the third rigid part 213. Consequently, the deformation is greatest at the midpoint between the second and fourth rigid parts 212, meaning the strain is greatest. Therefore, placing the stress detection component 3 at the midpoint between the second and / or fourth rigid parts 212 and 214 ensures the detection accuracy of the stress detection component 3.
[0077] In some embodiments, the piezoelectric sheet is disposed on the second rigid portion 212 or the fourth rigid portion 214, and a plurality of the battery cells of the battery cell module 1 are arranged sequentially along the length direction of the second rigid portion 212, with the connection point of at least two adjacent battery cells facing the piezoelectric sheet.
[0078] It is understandable that the piezoelectric element is positioned at the second rigid part 212 or the fourth rigid part 214, and that the piezoelectric element corresponds to at least two adjacent cells, that is, the connection point of at least two adjacent cells is directly opposite the piezoelectric element. The deformation of the rigid component 2 corresponding to the connection point of two adjacent cells is relatively large, thereby ensuring the detection accuracy of the piezoelectric element.
[0079] In one embodiment of this application, the stress detection component 3 extends along the width direction of the rigid member 21, and the extension length of the stress detection component 3 is equal to the width of the rigid member 21.
[0080] It is understandable that by setting the length of the stress detection component 3 in the width direction of the rigid member 21 to be the same as the width of the rigid member 21, the stress detection component 3 can cover the rigid member 21 in the width direction, so that the stress detection component 3 can effectively detect the stress of the rigid member 21 and ensure the accuracy of the detection.
[0081] In some examples, the extension length of the stress detection component 3 is equal to the width of the rigid member 21. This can be understood as the edge of the orthographic projection of the stress detection component 3 onto the rigid member 21 coinciding with the length side of the rigid member 21.
[0082] According to an embodiment of the second aspect of this application, the battery module includes a cell module 1 and the aforementioned battery detection device, with a rigid component 2 sleeved on the cell module 1.
[0083] The rigid component 2 is fitted onto the outer wall of the cell module 1. The rigid component 2 can fasten multiple cells of the cell module 1. At the same time, under the action of the cell module 1, the rigid component 2 will also generate corresponding stress.
[0084] When the multiple cells of the battery module 1 are neatly arranged, i.e., aligned, the force exerted by the battery module 1 on the rigid component 2 will be uniform. The stress detection component 3 detects the stress at at least two different locations on the rigid component 2. If the stress at different locations on the rigid component 2 is the same or the difference is within a preset value, it indicates that the multiple cells of the battery module 1 are aligned. If the stress at different locations on the rigid component 2 is different or the difference is greater than the preset value, it indicates that the multiple cells of the battery module 1 are not aligned. In other words, this application uses the stress detection component 3 to detect the stress at different locations on the rigid component 2, and by comparing the stress values at different locations, the uniformity of the force on the battery module 1 can be obtained, thus determining whether the multiple cells of the battery module 1 are aligned and achieving the detection of the alignment degree of the battery module 1.
[0085] According to an embodiment of the third aspect of this application, the vehicle includes the battery module described above.
[0086] According to the vehicle embodiment of this application, the stress detection component 3 detects the stress at at least two different locations of the rigid component 2. When the stress at different locations of the rigid component 2 is the same or the difference is within a preset value, it indicates that the multiple cells of the battery module 1 are aligned with each other. When the stress at different locations of the rigid component 2 is different or the difference is greater than the preset value, it indicates that the multiple cells of the battery module 1 are not aligned with each other. In other words, this application detects the stress at different locations of the rigid component 2 by the stress detection component 3, and compares the stress values at different locations to obtain the stress uniformity of the battery module 1. This allows for the determination of whether the multiple cells of the battery module 1 are aligned with each other, thus realizing the detection of the alignment degree of the battery module 1.
[0087] According to the embodiments of the fourth aspect of this application, such as Figure 6 The battery alignment detection method of the battery detection device or battery based on the above embodiments includes:
[0088] Step 101: Obtain stress values at different locations of rigid component 2;
[0089] It is understandable that by acquiring the detection data of the stress detection component 3, the stress values at different locations of the rigid component 2 can be obtained.
[0090] Step 102: Based on the stress values at different locations of the rigid component 2, determine the alignment of multiple cells in the cell module 1;
[0091] It is understandable that the rigid component 2 is attached to the battery cell module 1, and the multiple battery cells of the battery cell module 1 are neatly arranged. That is, when the multiple battery cells are aligned, the force exerted by the battery cell module 1 on the rigid component 2 will be uniform. In other words, the stress at different positions of the rigid component 2 should be the same or the difference should be less than a preset value. Therefore, by analyzing the stress at different positions of the rigid component 2, the alignment degree of the multiple battery cells of the battery cell module 1 can be determined.
[0092] According to the battery alignment detection method of this application embodiment, by obtaining the stress values at different positions of the rigid component 2, the stress at different positions of the rigid component 2 is compared. When the stress at different positions of the rigid component 2 is the same or the difference is less than a preset value, it indicates that the rigid component 2 is under uniform stress and the multiple cells of the battery module 1 are aligned. When the difference in stress at different positions of the rigid component 2 is greater than the preset value, it indicates that the rigid component 2 is under uneven stress and the multiple cells of the battery module 1 are not aligned, thereby realizing the detection of the alignment degree of the multiple cells of the battery module 1.
[0093] In one embodiment of this application, the step of obtaining stress values at different locations of the rigid component 2 includes:
[0094] Obtain the shift of the resonance peak at different positions of rigid component 2;
[0095] Based on the shift of the resonance peak at different positions of the rigid component 2, the stress values at different positions of the rigid component 2 are determined.
[0096] It is understandable that when obtaining the stress values at different positions of the rigid component 2, the shift of the resonant peak of the rigid component 2 will also be different when the stress of the rigid component 2 is different. Therefore, the shift of the resonant peak at different positions of the rigid component 2 can be obtained first, and then the corresponding stress can be calculated based on the shift of the resonant peak, thereby obtaining the stress values at different positions of the rigid component 2.
[0097] In one embodiment of this application, the step of obtaining stress values at different locations of the rigid component 2 includes:
[0098] Obtain the strain at different locations of rigid component 2;
[0099] Based on the strain at different locations of rigid component 2, the stress values at different locations of rigid component 2 are determined.
[0100] It is understandable that the stress and strain of rigid component 2 are corresponding. Therefore, when obtaining the stress value at different locations of rigid component 2, the strain at different locations of rigid component 2 can be obtained first, and then the corresponding stress value can be determined based on the strain. Thus, the stress value at different locations of rigid component 2 can be obtained.
[0101] In one embodiment of this application, the battery alignment detection method further includes:
[0102] Based on the strain and health status database of rigid component 2, the health status of cell module 1 is determined. The health status database includes the strain of rigid component 2 when cell module 1 is in different health statuses.
[0103] It is understandable that the internal expansion force of battery cell module 1 varies depending on its health status, which in turn affects the stress on rigid component 2. Therefore, by acquiring the real-time strain of rigid component 2 and comparing it with a health database, the health status of battery cell module 1 corresponding to the real-time strain of rigid component 2 can be determined, thus enabling the detection of the health status of battery cell module 1.
[0104] In one embodiment of this application, the battery alignment detection method further includes:
[0105] Based on the strain and standard value of rigid component 2, it is determined that cell module 1 is in a state of thermal runaway;
[0106] Control cell module 1 to disconnect power;
[0107] The standard value is the strain of the rigid component 2 when thermal runaway occurs in the cell module 1.
[0108] Understandably, by comparing the strain of rigid component 2 with the standard value, when the strain of rigid component 2 is the same as the standard value, it indicates that the cell module 1 is already in a state of thermal runaway. Therefore, the power supply to the cell module 1 is immediately cut off, thus achieving early power cut-off and increasing the safety performance of the cell module 1.
[0109] In one embodiment of this application, before the step of obtaining stress values at different locations of the rigid component 2, the method further includes:
[0110] Install the stress detection component 3 onto the rigid component 2, and set the detection value of the stress detection component 3 to 0;
[0111] Apply compressive force to the cell module 1 to cause the cell module 1 to deform;
[0112] Rigid component 2 is fitted onto cell module 1;
[0113] Stop applying pressure to cell module 1.
[0114] Understandably, before fitting the rigid component 2 onto the cell module 1, the detection value of the stress detection component 3 is reset to zero to ensure the accuracy of subsequent detection data. Pressure is applied to the cell module 1 to cause it to deform, so that the rigid component 2 can be smoothly and quickly fitted onto the cell module 1.
[0115] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A battery testing device, characterized in that, include: A rigid component, suitable for being sleeved on and attached to the outer wall of a battery cell module, the battery cell module comprising a plurality of battery cells arranged in sequence; A stress detection component is connected to one side of the outer surface of the rigid component. The stress detection component is used to detect the stress at at least two different locations of the rigid component to determine the alignment of the cell module.
2. The battery testing device according to claim 1, characterized in that, The stress detection assembly includes a magnetic induction coil and two magnetic components arranged opposite each other. Both magnetic components are mounted on the outer wall surface of the rigid assembly, and the magnetic induction coil is located between the two magnetic components.
3. The battery testing device according to claim 1, characterized in that, The rigid component includes at least two rigid members, both of which are sleeved on the battery cell module, and the stress detection component is connected to the outer wall surface of each rigid member.
4. The battery testing device according to claim 3, characterized in that, The ratio of the distance between the different rigid components to the height of the battery cell module is between 0.3 and 0.
7.
5. The battery testing device according to claim 3, characterized in that, At least two of the rigid components include a first rigid component and a second rigid component. The battery cell module includes a first end face and a second end face disposed opposite to each other. Along the height direction of the battery cell module, the first end face, the first rigid component, the second rigid component, and the second end face are distributed sequentially. The ratio of the distance between the first rigid member and the first end face to the height of the battery cell module is between 0.1 and 0.
3. The ratio of the distance between the second rigid member and the second end face to the height of the battery cell module is between 0.1 and 0.
3.
6. The battery testing device according to any one of claims 3 to 5, characterized in that, The stress detection components at two adjacent rigid components are symmetrically distributed about the two adjacent rigid components.
7. The battery testing device according to any one of claims 3 to 5, characterized in that, At least two of the rigid members are arranged along the height direction of the battery cell module, and the orthographic projections of the stress detection components on the at least two of the rigid members along the height direction of the battery cell module at least partially overlap.
8. The battery testing device according to any one of claims 1 to 5, characterized in that, The rigid component includes a first rigid part, a second rigid part, a third rigid part, and a fourth rigid part connected in sequence. The first rigid part and the third rigid part are arranged opposite each other and have the same length. The second rigid part and the fourth rigid part are arranged opposite each other and have the same length. The length of the first rigid part is less than the length of the second rigid part. The stress detection component is connected at the middle position of the second rigid part and / or the fourth rigid part.
9. The battery testing device according to claim 8, characterized in that, The stress detection assembly includes a control component and at least two piezoelectric elements, which are attached to different positions of the rigid assembly. The piezoelectric elements are electrically connected to the control component, and the control component is configured to determine the stress at different positions of the rigid assembly based on the voltage of the different piezoelectric elements.
10. The battery testing device according to claim 9, characterized in that, The piezoelectric element is disposed on the second rigid part or the fourth rigid part, and the plurality of cells of the cell module are arranged sequentially along the length direction of the second rigid part, with the connection point of at least two adjacent cells facing the piezoelectric element.
11. A battery module, characterized in that, It includes a cell module and a battery testing device as described in any one of claims 1 to 10, wherein the rigid component is sleeved on the cell module.
12. A vehicle, characterized in that, Includes the battery module as described in claim 11.