Battery detection device, battery module and battery system detection method

Abstract

The invention provides a battery detection device, a battery module and a battery system detection method. The battery detection device comprises a rigid part, a resonance detection assembly and a control part, the rigid part is suitable for sleeving a battery cell module and being attached to the outer wall surface of the battery cell module, the resonance detection assembly is arranged on the side, away from the battery cell module, of the rigid part, and the resonance detection assembly is used for detecting the offset of a resonance peak of the rigid part; the control part is electrically connected with the resonance detection assembly, and the control part is configured to determine the state of the battery cell module based on the offset of the resonance peak of the rigid part. According to the battery detection device, the detection of the battery cell module can be realized without a large number of detection sensors, the detection complexity and the detection cost of the battery cell module are reduced, a detection element does not need to be arranged in the battery cell module, the damage to the mechanical boundary condition of the module is avoided, and the detection efficiency is improved. And test errors caused by damage of mechanical boundary conditions of the battery cell module can be effectively avoided.

Description

Technical Field

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

[0002] During the production and use of batteries, the battery cell modules need to be tested accordingly.

[0003] In the related art, detection is mainly achieved by disposing a large number of detection sensors in the battery cell module to obtain corresponding data, which is prone to measurement errors. Summary of the invention

[0004] The embodiments of the present application provide a battery detection device, a battery module and a battery system detection method, which can improve the technical problem that measurement errors are prone to occur in battery cell module detection.

[0005] In a first aspect, an embodiment of the present application provides a battery detection device, comprising:

[0006] A rigid member, suitable for being sleeved on the battery cell module and being fitted with the outer wall surface of the battery cell module;

[0007] A resonance detection component is disposed on a side of the rigid member away from the battery module, and is used to detect the deviation of the resonance peak of the rigid member;

[0008] A control component is electrically connected to the resonance detection component, and the control component is configured to determine the state of the battery cell module based on the shift of the resonance peak of the rigid component.

[0009] In one embodiment, the resonance detection component includes a resonator, the inner wall surface of the rigid part is suitable for fitting with the battery core module, the resonator is attached to the outer wall surface of the rigid part, and the resonator is used to detect the offset of the resonance peak of the rigid part.

[0010] In one embodiment, the resonance detection component includes at least two resonators, wherein:

[0011] The two resonators are symmetrically distributed about the midline of the rigid member; and / or,

[0012] The inner wall surface of the rigid part is suitable for fitting with the battery core module, and at least two resonators are evenly distributed on the outer wall surface of the rigid part along the circumference of the rigid part.

[0013] In one embodiment, the resonance detection component includes a capacitive sensor, which is attached to the outer wall surface of the rigid part. The capacitive sensor is electrically connected to the control component, and the control component is configured to determine the offset of the resonance peak of the rigid part based on the detection data of the capacitive sensor.

[0014] In one embodiment, the battery detection device further includes a temperature detection element, which is electrically connected to the control component, and is used to detect the temperature of the battery cell module. The control component is configured to: determine the state of the battery cell module based on the shift of the resonance peak of the rigid component and the detection data of the temperature detection element; and / or,

[0015] The battery detection device also includes a voltage detection element, which is electrically connected to the control component and is used to detect the voltage of the battery cell module. The control component is configured to determine the state of the battery cell module based on the offset of the resonance peak of the rigid component and the detection data of the voltage detection element.

[0016] In one embodiment, the rigid part 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 to each other and have equal lengths, the second rigid part and the fourth rigid part are arranged opposite to each other and have equal lengths, the length of the first rigid part is smaller than the length of the second rigid part, and the resonant detection component is connected to the middle position of the second rigid part and / or the fourth rigid part.

[0017] In one embodiment, a ratio of the length of the resonant detection component to the length of the second rigid portion is greater than 0.1.

[0018] In a second aspect, an embodiment of the present application provides a battery module, including a battery cell module and the above-mentioned battery detection device, wherein the rigid member is sleeved on the battery cell module.

[0019] In one embodiment, the battery detection device includes at least two rigid members, and at least two rigid members are sleeved on the battery cell module, and the outer wall surface of each rigid member is connected to the resonance detection component.

[0020] In one embodiment, the resonant detection components at two adjacent rigid members are symmetrically distributed about a symmetry plane of the two adjacent rigid members.

[0021] In a third aspect, an embodiment of the present application provides a battery system detection method, including:

[0022] Obtaining the offset value of the resonance peak of the rigid component;

[0023] Based on the offset value of the resonance peak, the state of the battery cell module and the preload force applied to the battery cell module are determined.

[0024] In one embodiment, the step of determining the state of the battery cell module based on the shift of the resonance peak includes:

[0025] The health status of the battery module is determined based on the shift of the current resonance peak of the rigid part and a health status database, wherein the health status database includes the shift of the resonance peak of the rigid part when the battery module is in different health states.

[0026] In one embodiment, the step of determining the health status of the battery module based on the offset of the current resonance peak of the rigid member and the health status database includes:

[0027] Obtaining the current temperature and current voltage of the battery cell module;

[0028] Determining the health status of the battery cell module based on the current temperature, the current voltage, the shift of the current resonance peak of the rigid member, and the health status database;

[0029] The health status database includes the displacement of the resonance peak of the rigid part when the battery module is at different temperatures, different voltages and different health states.

[0030] In one embodiment, the step of determining the state of the battery cell module based on the shift of the resonance peak includes:

[0031] Determining that the battery cell module is in a thermal runaway state based on the offset of the current resonance peak of the rigid component and a reference value;

[0032] The reference value is the offset of the resonance peak of the rigid component when thermal runaway occurs in the battery cell module.

[0033] In one embodiment, the step of determining that the battery cell module is in a thermal runaway state based on the offset of the current resonance peak of the rigid component and the reference value includes:

[0034] Obtaining the current temperature and current voltage of the battery cell module;

[0035] Determining the reference value based on the current temperature, the current voltage and a thermal runaway database, wherein the thermal runaway database includes the shift of the resonance peak of the rigid component when the battery cell module has thermal runaway under different temperature and different voltage conditions;

[0036] Based on the offset of the current resonance peak of the rigid component and the reference value, it is determined that the battery cell module is in a thermal runaway state.

[0037] Beneficial effects of the embodiments of the present application:

[0038] In an embodiment of the present application, a rigid part is sleeved on the outer wall surface of the battery cell module. When the state of the battery cell module changes, the offset of the resonance peak of the rigid part will change due to the fit between the rigid part and the outer wall surface of the battery cell module. In other words, the state of the battery cell module is associated with the offset of the resonance peak of the rigid part. The present application detects the offset of the resonance peak of the rigid part through a resonance detection component. The state of the battery cell module can be determined according to the offset of the resonance peak of the rigid part. The battery cell module can be detected without a large number of detection sensors, reducing the detection complexity and detection cost of the battery cell module. There is no need to set a detection element inside the battery cell module to avoid damage to the mechanical boundary conditions of the module itself, which can effectively avoid test errors caused by the destruction of the mechanical boundary conditions of the battery cell module. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 is a schematic diagram of the structure of a battery detection device provided in an embodiment of the present application;

[0041] Figure 2 is a schematic diagram of the structure of a battery detection device provided in an embodiment of the present application, wherein a rigid member is sleeved on a battery cell module;

[0042] Figure 3 It is one of the top views of the battery detection device provided in the embodiment of the present application;

[0043] Figure 4 This is a second top view of the battery detection device provided in an embodiment of the present application;

[0044] Figure 5 is a schematic diagram of the structure of a battery detection device provided in an embodiment of the present application;

[0045] Figure 6 It is a flow chart of a battery system detection method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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 those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0047] Combine the following Figures 1 to 6 The present invention describes a battery detection device, a battery module and a battery system detection method.

[0048] According to the embodiment of the first aspect of the present application, Figure 1 , Figure 2 and Figure 3 The battery detection device includes a rigid part 1 and a resonance detection component 2. The rigid part 1 is suitable for being sleeved on the battery cell module 3 and being fitted with the outer wall surface of the battery cell module 3. The resonance detection component 2 is arranged on the side of the rigid part 1 away from the battery cell module 3. The resonance detection component 2 is used to detect the offset of the resonance peak of the rigid part 1 to determine the stress of the rigid part 1.

[0049] According to the battery detection device of the embodiment of the present application, the rigid part 1 is sleeved on the outer wall surface of the battery module 3. When the state of the battery module 3 changes, the offset of the resonance peak of the rigid part 1 will change due to the fit between the rigid part 1 and the outer wall surface of the battery module 3. In other words, the state of the battery module 3 is associated with the offset of the resonance peak of the rigid part 1. The present application detects the offset of the resonance peak of the rigid part 1 through the resonance detection component 2. The state of the battery module 3 can be determined according to the offset of the resonance peak of the rigid part 1. The battery module 3 can be detected without a large number of detection sensors, thereby reducing the detection complexity and detection cost of the battery module 3. There is no need to set a detection element inside the battery module 3 to avoid damage to the mechanical boundary conditions of the module itself, which can effectively avoid the test error caused by the destruction of the mechanical boundary conditions of the battery module 3.

[0050] Exemplarily, a mapping relationship between the state of the battery cell module 3 and the shift of the resonance peak of the rigid component 1 may be established in advance. When the shift of the resonance peak of the rigid component 1 is obtained, the state of the battery cell module may be determined according to the mapping relationship.

[0051] It is also possible to first determine the stress of the rigid part 1 by using the offset of the resonance peak of the rigid part 1, and then determine the state of the battery module according to the stress of the rigid part 1. Specifically, when the state of the battery module 3 changes, the stress of the rigid part 1 will change accordingly, that is, the state of the battery module 3 can be determined by the stress of the rigid part 1. Then, the offset of the resonance peak of the rigid part 1 can be detected by the resonance detection component 2, and the stress of the rigid part 1 can be calculated according to the offset of the resonance peak of the rigid part 1, and the state of the battery module 3 can be judged by the stress of the rigid part 1.

[0052] In some examples, the rigid member 1 is, for example, a steel strip or an aluminum strip. It should be noted that the rigid member 1 is merely illustrated here and is not specifically limited to the rigid member 1.

[0053] In some examples, the health status of the battery cell module 3 can be detected by using the shift of the resonance peak of the rigid part 1. For example, the internal expansion force of the battery cell module 3 will act on the rigid part 1, and the rigid part 1 will deform after being subjected to the force, and the resonance peak will also shift, that is, the internal expansion force of the battery cell module 3 can be determined by detecting the shift of the resonance peak of the rigid part 1, and then the health status of the battery cell module 3 can be determined according to the internal expansion force of the battery cell module 3, so as to realize the detection of the battery cell module 3.

[0054] The offset of the resonance peak of the rigid part 1 can also be used to detect whether the multiple cells in the cell module 3 are neatly arranged. When the multiple cells of the cell module 3 are neatly arranged, the stresses at different positions of the rigid part 1 are basically the same, that is, the offsets of the resonance peaks at different positions of the rigid part 1 are basically the same. Then, by detecting the offsets of the resonance peaks at different positions of the rigid part 1, it can be determined whether the multiple cells of the cell module 3 are neatly arranged.

[0055] The above is only an example of using the offset of the resonance peak of the rigid part 1 to detect the state of the battery cell module 3. The offset of the resonance peak of the rigid part 1 can be used to perform stress analysis on the battery cell module 3, that is, the offset of the resonance peak of the rigid part 1 can also be used to detect other characteristics of the battery cell module 3.

[0056] In one embodiment of the present application, the battery detection device further includes a control component, which is electrically connected to the resonance detection component 2 , and the control component is configured to determine the state of the battery cell module based on the offset of the resonance peak of the rigid part 1 .

[0057] It is understandable that the resonance detection component 2 transmits the detection data, that is, transmits the offset data of the resonance peak of the rigid part 1 to the control component, and the control component can determine the state of the battery module 3 according to the offset of the resonance peak of the rigid part 1.

[0058] Specifically, there is a corresponding mapping relationship between the offset of the resonance peak of the rigid part 1 and the state of the battery cell module 3. The mapping relationship can be determined through experiments. Specifically, the battery cell module 3 can be in different states by controlling the number of charge and discharge times or the temperature. Then, the offset of the resonance peak of the rigid part 1 when the battery cell module 3 is in different states can be detected to determine the mapping relationship between the offset of the resonance peak of the rigid part 1 and the state of the battery cell module 3. Subsequently, the state of the battery cell module 3 can be directly determined based on the offset of the resonance peak of the rigid part 1.

[0059] In some examples, the stress of the rigid part 1 can also be calculated by the offset of the resonance peak to complete the conversion between the offset and stress of the resonance peak, and then the state of the battery module 3 can be determined according to the stress of the rigid part 1. Specifically, the control component can store the corresponding conversion relationship in advance. In the early stage, by setting a completely identical first battery cell module and second battery cell module, a resonance detection component 2 is set at the rigid part 1 at the first battery cell module, and a stress sensor is set at the rigid part 1 at the second battery cell module. The first battery cell module 3 and the second battery cell module 3 are completely identical, and then the offset of the resonance peak detected by the resonance detection component 2 can be corresponded to the stress detected by the stress sensor, and the corresponding relationship can be stored in the control component, so that when the control component receives the offset data of the resonance peak of the rigid part 1, it can determine the corresponding stress of the rigid part 1.

[0060] In one embodiment of the present application, Figure 4 The rigid part 1 includes a first rigid part 11, a second rigid part 12, a third rigid part 13 and a fourth rigid part 14 which are connected in sequence. The first rigid part 11 and the third rigid part 13 are arranged opposite to each other and have the same length. The second rigid part 12 and the fourth rigid part 14 are arranged opposite to each other and have the same length. The length of the first rigid part 11 is smaller than the length of the second rigid part 12. The resonant detection component 2 is connected to the middle position of the second rigid part 12 and / or the fourth rigid part 14.

[0061] It can be understood that the first rigid part 11, the second rigid part 12, the third rigid part 13 and the fourth rigid part 14 are connected end to end to form the rigid part 1, and the first rigid part 11, the second rigid part 12, the third rigid part 13 and the fourth rigid part 14 are all in contact with the outer wall surface of the battery module 3. If the length of the second rigid part 12 and the fourth rigid part 14 is longer, the stress on the second rigid part 12 and the fourth rigid part 14 will be greater than the stress on the first rigid part 11 and the third rigid part 13, and at the second rigid part 12 and the fourth rigid part 14, the deformation degree at the middle position of the second rigid part 12 and the fourth rigid part 14 is the largest, that is, the displacement of the resonance peak is the largest, and then the resonance detection component 2 is set at the middle position of the second rigid part 12 and / or the fourth rigid part 14, which ensures the detection accuracy of the resonance detection component 2.

[0062] It can be understood that the resonance detection component 2 can be set at the middle position of the second rigid part 12 and the fourth rigid part 14 at the same time, so as to obtain data of the offset of the two resonance peaks. The two detection data can be used to verify each other. When the difference between the two detection data is too large, it means that one of the resonance detection components 2 may have a problem and needs to be checked in time. The two detection data can also be combined to obtain a more accurate offset of the resonance peak of the rigid part 1, thereby improving the detection accuracy.

[0063] In one embodiment of the present application, the resonance detection component 2 is used to detect the shift of the resonance peaks at at least two different positions of the rigid member 1 to determine the stress at at least two different positions of the rigid member 1 .

[0064] The rigid component 1 is sleeved on the outer wall surface of the battery cell module 3 . The rigid component 1 can fasten the multiple battery cells of the battery cell module 3 . Meanwhile, under the action of the battery cell module 3 , the rigid component 1 will also generate corresponding stress.

[0065] When the multiple battery cells of the battery cell module 3 are neatly arranged, that is, the multiple battery cells are aligned, the force exerted by the battery cell module 3 on the rigid part 1 will be uniform. Then the stresses at at least two different positions of the rigid part 1 are detected by the resonance detection component 2. When the stresses at different positions of the rigid part 1 are the same or the difference is within the preset value, it means that the multiple battery cells of the battery cell module 3 are aligned with each other at this time. When the stresses at different positions of the rigid part 1 are different or the difference is greater than the preset value, it means that the multiple battery cells of the battery cell module 3 are not aligned with each other at this time. In other words, the present application detects the stresses at different positions of the rigid part 1 through the resonance detection component 2, and compares the stress values ​​at different positions to obtain the force uniformity of the battery cell module 3, and can determine whether the multiple battery cells of the battery cell module 3 are aligned with each other, thereby realizing the detection of the alignment state of the battery cell module 3.

[0066] In one embodiment of the present application, Figure 1 , Figure 2 , Figure 3 and Figure 4 The resonance detection component 2 includes a resonator 21. The inner wall surface of the rigid part 1 is suitable for fitting with the battery core module 3. The resonator 21 is attached to the outer wall surface of the rigid part 1. The resonator 21 is used to detect the deviation of the resonance peak of the rigid part 1.

[0067] It can be understood that the offset of the resonance peak of the rigid part 1 can be detected by the resonator 21, so as to determine the stress of the rigid part 1 according to the offset of the resonance peak. The state of the battery module can be judged according to the stress of the rigid part 1, thereby realizing the detection of the battery module.

[0068] In one embodiment of the present application, Figure 4The resonance detection component 2 includes at least two resonators 21 , and the two resonators 21 are symmetrically distributed about the center line of the rigid component 1 .

[0069] It can be understood that the two resonators 21 are symmetrically distributed about the midline of the rigid part 1, that is, the positions where the rigid part 1 is connected to the two resonators 21 are also symmetrical. When the state of the battery module 3 is normal, the strain amount at the position where the rigid part 1 is connected to the two resonators 21 should be the same, that is, the detection data of the two resonators 21 should be the same. Then, by determining whether the detection data of the two resonators 21 are the same, it can be determined whether the state of the battery module 3 is normal.

[0070] In some examples, after the rigid part 1 is sleeved on the battery module 3, the battery module 3 will be subjected to a certain preload force, and the rigid part 1 will have a certain stress. At this time, if the multiple batteries of the battery module 3 are neatly arranged, the stress at the position where the rigid part 1 is connected to the two symmetrically distributed resonators 21 should be the same, that is, the detection data of the two symmetrically distributed resonators 21 should be the same, and then by determining whether the detection data of the two resonators 21 are the same, it can be determined whether the multiple batteries of the battery module 3 are neatly arranged.

[0071] In one embodiment of the present application, the resonance detection component 2 includes at least two resonators 21 , and the at least two resonators 21 are evenly distributed on the outer wall surface of the rigid component 1 along the circumference of the rigid component 1 .

[0072] It can be understood that at least two resonators 21 can comprehensively detect the offset of the resonance peak of the rigid part 1, and can determine the state of different positions of the battery cell module 3 according to the offset of the resonance peak at different positions of the rigid part 1, thereby realizing refined detection of the battery cell module 3, and can also combine the offset of the resonance peak at different positions to obtain a more accurate resonance peak offset data that can represent the overall state of the battery cell module 3, thereby improving the detection accuracy of the battery cell module 3.

[0073] In one embodiment of the present application, the resonance detection component 2 includes a magnetic induction coil and two magnetic parts arranged opposite to each other. The two magnetic parts are installed on the outer wall surface of the rigid part 1. The magnetic induction coil is located between the two magnetic parts. The magnetic induction coil is electrically connected to the control component.

[0074] It is understandable that a magnetic field can be formed between the two magnetic parts, and the magnetic induction coil can output corresponding induction data when it is between the two magnetic parts. The rigid part 1 will deform after being subjected to force, and the deformation of the rigid part 1 will cause the distance between the two magnetic parts to change, so that the magnetic flux passing through the magnetic induction coil changes, and the induction data of the magnetic induction coil will also change. That is, the state change of the battery core module 3 will simultaneously cause the change of the induction data of the magnetic induction coil and the change of the offset of the resonance peak of the rigid part 1, and then the offset of the resonance peak of the rigid part 1 can be determined through the induction data of the magnetic induction coil, thereby realizing the detection of the offset of the resonance peak of the rigid part 1.

[0075] In one embodiment of the present application, the resonance detection component 2 includes a capacitive sensor, which is attached to the outer wall of the rigid part 1. The capacitive sensor is electrically connected to the control component, and the control component is configured to determine the offset of the resonance peak of the rigid part 1 based on the detection data of the capacitive sensor.

[0076] It is understandable that the capacitive sensor transmits the detection data to the control component, and the control component compares and calculates the detection data of the capacitive sensor at different times or under different conditions, and then determines whether the resonant frequency of the rigid part 1 has shifted and how much the shift is. That is, through the cooperation of the capacitive sensor and the control component, the shift of the resonance peak of the rigid part 1 can be detected.

[0077] In one embodiment of the present application, the battery detection device also includes a temperature detection element, which is electrically connected to the control component. The temperature detection element is used to detect the temperature of the battery cell module 3. The control component is configured to determine the state of the battery cell module 3 based on the offset of the resonance peak of the rigid component 1 and the detection data of the temperature detection element.

[0078] It can be understood that the temperature of the battery cell module 3 is detected by the temperature detection component, so as to realize current monitoring of the temperature of the battery cell module 3 .

[0079] When the battery cell module 3 is at different temperatures, the expansion force of the battery cell module 3 in the same state may be different, that is, the temperature will affect the detection of the offset of the resonance peak of the rigid part 1. In this embodiment, the temperature detection component can transmit the detection data to the control component, so that the control component can determine the state of the battery cell module 3 according to the offset of the resonance peak of the rigid part 1 and the temperature of the battery cell module 3, reducing the influence of temperature on the detection and improving the accuracy of the detection of the state of the battery cell module 3.

[0080] In one embodiment of the present application, the battery detection device also includes a voltage detection element, which is electrically connected to the control component, and the voltage detection element is used to detect the voltage of the battery cell module 3. The control component is configured to determine the state of the battery cell module 3 based on the offset of the resonance peak of the rigid component 1 and the detection data of the voltage detection element.

[0081] It is understandable that the voltage of the battery cell module 3 is detected by the voltage detection component to achieve current monitoring of the voltage of the battery cell module 3.

[0082] When the battery module 3 is at different voltages, the expansion force of the battery module 3 in the same state may be different, that is, the voltage will affect the detection of the offset of the resonance peak of the rigid part 1. In this embodiment, the voltage detection component can transmit the detection data to the control component, so that the control component can determine the state of the battery module 3 according to the offset of the resonance peak of the rigid part 1 and the voltage of the battery module 3, reducing the influence of the voltage on the detection and improving the accuracy of the detection of the state of the battery module 3.

[0083] In one embodiment of the present application, the resonance detection component 2 extends along the width direction of the rigid component 1 , and the extension length of the resonance detection component 2 is equal to the width of the rigid component 1 .

[0084] It can be understood that the length of the resonance detection component 2 in the width direction of the rigid part 1 is set to be the same as the width of the rigid part 1, and then in the width direction of the rigid part 1, the resonance detection component 2 can cover the rigid part 1, and can effectively detect the offset of the resonance peak of the rigid part 1, thereby ensuring the accuracy of the detection.

[0085] In some examples, the extended length of the resonance detection component 2 is equal to the width of the rigid component 1 , which can be understood as the edge of the orthographic projection of the resonance detection component 2 on the rigid component 1 coincides with the length edge of the rigid component 1 .

[0086] In some embodiments, a ratio of a length of the resonant detection component to a length of the second rigid portion is greater than 0.1.

[0087] It is understandable that if the ratio of the length of the resonance detection component to the length of the second rigid part is less than 0.1, it is difficult for the resonance detection component to detect the offset of the resonance peak of the rigid part, that is, the detection accuracy of the resonance detection component may be insufficient. Therefore, the present application sets the ratio of the length of the resonance detection component to the length of the second rigid part to be greater than 0.1.

[0088] According to an embodiment of the second aspect of the present application, the battery module includes a battery cell module 3 and the battery detection device of the above embodiment, and the rigid member 1 is sleeved on the battery cell module 3.

[0089] According to the battery of the embodiment of the present application, the rigid part 1 is sleeved on the outer wall surface of the battery cell module 3. When the state of the battery cell module 3 changes, the offset of the resonance peak of the rigid part 1 will change due to the fit between the rigid part 1 and the outer wall surface of the battery cell module 3. In other words, the state of the battery cell module 3 is associated with the offset of the resonance peak of the rigid part 1. The present application detects the offset of the resonance peak of the rigid part 1 through the resonance detection component 2. The state of the battery cell module 3 can be determined based on the offset of the resonance peak of the rigid part 1. The battery cell module 3 can be detected without a large number of detection sensors, thereby reducing the detection complexity and detection cost of the battery cell module 3.

[0090] In one embodiment of the present application, Figure 5 The battery detection device includes at least two rigid parts 1, and the at least two rigid parts 1 are sleeved on the battery module 3. The outer wall surface of each rigid part 1 is connected to the resonance detection component 2.

[0091] It can be understood that each rigid part 1 is sleeved on the battery cell module 3, and the outer wall surface of each rigid part 1 is connected to the resonance detection component 2, that is, the offset of the resonance peak of each rigid part 1 can be detected, and then the state of the battery cell module 3 can be judged by the offset of the resonance peak at each rigid part 1.

[0092] It is understandable that the rigid member 1 is attached to the outer wall surface of the cell module 3, that is, the rigid member 1 can play a role in fastening the cell module 3. By providing at least two rigid members 1 and both being sleeved on the cell module 3, the fastening effect on the cell module 3 is improved.

[0093] By providing a resonance detection component 2 at each rigid part 1, the offset of the resonance peak of each rigid part 1 can be detected. When the offset of the resonance peak of each rigid part 1 is obtained, the state of different positions of the battery cell module 3 can be judged according to the position of the resonance detection component 2 of different rigid parts 1. The detection data of each resonance detection component 2 can also be combined to obtain more accurate resonance peak offset data that can represent the overall state of the battery cell module 3, thereby improving the detection accuracy of the battery cell module 3.

[0094] In some examples, when the state of the battery cell module 3 is normal, the offsets of the resonance peaks of different rigid parts 1 should be the same or the difference should be within the threshold. Then, the offsets of the resonance peaks of different rigid parts 1 are compared and calculated to determine whether the offset values ​​of some resonance peaks are abnormal. If so, the abnormal offset of the resonance peak can be eliminated to ensure the accuracy of the detection.

[0095] In one embodiment of the present application, Figure 5 The resonant detection components 2 at two adjacent rigid parts 1 are symmetrically distributed about the symmetry plane of the two adjacent rigid parts 1 .

[0096] It is understandable that after the rigid part 1 is sleeved on the battery module 3, the battery module 3 will be subjected to a certain preload force, and the rigid part 1 will have a certain stress. At this time, if the multiple batteries of the battery module 3 are neatly arranged, because the resonance detection components 2 at two adjacent rigid parts 1 are symmetrical to each other, the stress at the position where the two adjacent rigid parts 1 are connected to the resonance detection components 2 should be the same, that is, the detection data of the resonance detection components 2 at two adjacent rigid parts 1 should be the same, and then by determining whether the detection data of the resonance detection components 2 at two adjacent rigid parts 1 are the same, it can be determined whether the multiple batteries of the battery module 3 are neatly arranged.

[0097] According to an embodiment of the third aspect of the present application, Figure 6 The battery system detection method of the battery detection device based on the above embodiment includes:

[0098] Step 101: Obtain the offset value of the resonance peak of the rigid component 1.

[0099] It can be understood that by acquiring the detection data of the resonance detection component 2 , the offset value of the resonance peak of the rigid component 1 can be acquired.

[0100] Step 102 : determining the state of the battery cell module 3 and the preload force applied to the battery cell module 3 based on the offset value of the resonance peak.

[0101] It is understandable that the battery cell module 3 can be placed in different states by controlling the number of charge and discharge times or the temperature, and then the shift of the resonance peak of the rigid part 1 when the battery cell module 3 is in different states can be detected to determine the mapping relationship between the shift of the resonance peak of the rigid part 1 and the state of the battery cell module 3, and subsequently the state of the battery cell module 3 can be directly determined based on the shift of the resonance peak of the rigid part 1.

[0102] By setting up a completely identical first cell module and second cell module, setting up a resonance detection component 2 at the rigid part 1 at the first cell module, and setting up a stress sensor at the rigid part 1 at the second cell module, the first cell module 3 and the second cell module 3 are completely identical, and then the offset of the resonance peak detected by the resonance detection component 2 can be matched with the stress detected by the stress sensor, and the corresponding relationship can be stored in the control component, so that when the control component receives the offset data of the resonance peak of the rigid part 1, the stress of the rigid part 1 can be determined. After the rigid part 1 is sleeved on the cell module 3, the cell module 3 will be subjected to the preload force applied by the rigid part 1, and the rigid part 1 will also generate corresponding stress, and then according to the stress of the rigid part 1, the preload force of the cell module 3 can be calculated.

[0103] Exemplarily, the state of the cell module 3 and the preload force on the cell module 3 can be directly determined according to the offset value of the resonance peak. Specifically, there is a mapping relationship between the state of the cell module 3 and the offset value of the resonance peak of the rigid component, and there is also a mapping relationship between the preload force on the cell module 3 and the offset value of the resonance peak of the rigid component. When the offset value of the resonance peak of the rigid component 1 is determined, the state of the cell module 3 and the preload force on the cell module 3 can be directly determined according to the mapping relationship.

[0104] Alternatively, the stress of the rigid component 1 may be first calculated by the offset of the resonance peak to complete the conversion between the offset of the resonance peak and the stress, and then the state of the battery cell module 3 and the preload force applied thereto may be determined based on the stress of the rigid component 1 .

[0105] In some examples, the stress of the rigid component 1 and the preload force of the battery cell module 3 may be in a linear relationship or a nonlinear relationship.

[0106] It can be understood that the rigid part 1 fits the battery cell module 3 , and the stress of the rigid part 1 is associated with the state of the battery cell module 3 , that is, the state of the battery cell module 3 can be determined by analyzing the stress of the rigid part 1 .

[0107] According to the battery cell module 3 detection method of the embodiment of the present application, the state of the battery cell module 3 can be judged by obtaining the offset value of the resonance peak of the rigid part 1, and the battery cell module 3 can be detected without a large number of detection sensors, thereby reducing the detection complexity and detection cost of the battery cell module 3.

[0108] In one embodiment of the present application, before the step of obtaining the offset value of the resonance peak of the rigid member 1, the method further includes:

[0109] The resonance detection component 2 is mounted on the rigid component 1, and the detection value of the resonance detection component 2 is set to 0;

[0110] Applying extrusion force to the battery cell module 3 to deform the battery cell module 3;

[0111] The rigid member 1 is sleeved on the battery cell module 3;

[0112] Stop applying the squeezing force to the battery cell module 3.

[0113] It is understandable that before the rigid part 1 is sleeved on the battery module 3, the detection value of the resonance detection component 2 is reset to zero to ensure the accuracy of the subsequent detection data. Apply pressure to the battery module 3 to deform the battery module 3 so that the rigid part 1 can be smoothly and quickly sleeved on the battery module 3. After the rigid part 1 is sleeved on the battery module 3, stop applying the squeezing force to the battery module 3, the battery module 3 will restore the deformation and fit with the rigid part 1. At this time, the battery module 3 will be subjected to the pre-tightening force applied by the rigid part 1, and the rigid part 1 will also generate corresponding stress.

[0114] In one embodiment of the present application, the step of determining the state of the battery cell module 3 based on the shift of the resonance peak includes:

[0115] The health status of the battery cell module 3 is determined based on the shift of the current resonance peak of the rigid part 1 and the health status database, wherein the health status database includes the shift of the resonance peak of the rigid part 1 when the battery cell module 3 is in different health states.

[0116] It is understandable that by comparing the current resonance peak offset of the rigid component 1 with the health status database, the health status of the battery cell module 3 corresponding to the current resonance peak offset can be obtained, thereby realizing the detection of the health status of the battery cell module 3.

[0117] Exemplarily, a battery cell module 3 is set as a calibration battery cell module 3, and a long cycle test is performed on the calibration battery cell module 3, that is, the battery cell module 3 is subjected to multiple charge and discharge cycles, and the SOH state (that is, health state) of the calibration battery cell module 3 and the corresponding offset of the resonance peak of the rigid part 1 after each cycle are recorded, and the health state and the corresponding offset of the resonance peak are stored in a health state database, so that the current health state of the battery cell module 3 can be determined later according to the offset of the current resonance peak.

[0118] In one embodiment of the present application, based on the offset of the current resonance peak of the rigid member 1 and the health status database, the step of determining the health status of the battery module 3 includes:

[0119] Get the current temperature and current voltage of the battery module 3;

[0120] Determine the health status of the battery module 3 based on the current temperature, the current voltage, the offset of the current resonance peak of the rigid part 1 and the health status database;

[0121] The health status database includes the shift of the resonance peak of the rigid part 1 when the battery module 3 is at different temperatures, different voltages and different health states.

[0122] It is understandable that when the battery cell module 3 is at different temperatures and different voltages, the expansion force of the battery cell module 3 in the same state may be different, that is, the temperature and voltage will affect the detection of the offset of the resonance peak of the rigid part 1. Therefore, when determining the health status of the battery cell module 3, the current temperature and current voltage of the battery cell module 3 are also obtained, and the current temperature, current voltage, and the offset of the current resonance peak are compared with the health status database to obtain the health status of the battery cell module 3, so as to realize the detection of the health status of the battery cell module 3, and at the same time avoid the influence of temperature and voltage on the health status detection.

[0123] In one embodiment of the present application, the step of determining the state of the battery cell module 3 based on the shift of the resonance peak includes:

[0124] Based on the offset of the current resonance peak of the rigid part 1 and the reference value, it is determined that the battery module 3 is in a thermal runaway state;

[0125] The reference value is the shift of the resonance peak of the rigid component 1 when the battery cell module 3 undergoes thermal runaway.

[0126] It can be understood that when determining the state of the battery cell module 3, the offset of the current resonance peak of the rigid part 1 and the offset of the resonance peak of the rigid part 1 when the battery cell module 3 is in a thermal runaway state are compared. When the offset of the current resonance peak and the offset of the resonance peak of the rigid part 1 when the battery cell module 3 is in a thermal runaway state are the same, it means that the battery cell module 3 is in a thermal runaway state.

[0127] In one embodiment of the present application, after the step of determining that the battery cell module 3 is in a thermal runaway state based on the offset and reference value of the current resonance peak of the rigid member 1, the battery system detection method further includes:

[0128] Control the power supply of battery module 3.

[0129] It can be understood that when it is determined that the battery cell module 3 is in a thermal runaway state, the battery cell module 3 is controlled to be powered off, thereby realizing thermal runaway detection and power-off control at the module level, which can cut off the power in advance and improve the safety of the battery.

[0130] In one embodiment of the present application, based on the offset of the current resonance peak of the rigid member 1 and the reference value, the step of determining that the battery module 3 is in a thermal runaway state includes:

[0131] Get the current temperature and current voltage of the battery module 3;

[0132] Determine a reference value based on the current temperature, the current voltage and a thermal runaway database, wherein the thermal runaway database includes the shift of the resonance peak of the rigid part 1 when the battery cell module 3 has thermal runaway under different temperature and different voltage conditions;

[0133] Based on the deviation of the current resonance peak of the rigid component 1 and the reference value, it is determined that the battery cell module 3 is in a thermal runaway state.

[0134] It is understandable that when the battery cell module 3 is at different temperatures and different voltages, the expansion force of the battery cell module 3 in the same state may be different, that is, the voltage will affect the detection of the offset of the resonance peak of the rigid part 1. Therefore, when determining whether the battery cell module 3 is in a thermal runaway state, the current temperature and current voltage of the battery cell module 3 will be obtained first, and the current temperature, current voltage and thermal runaway database will be compared. When the battery cell module 3 has thermal runaway under the current temperature and current voltage conditions, the reference value of the offset of the resonance peak of the rigid part 1 can be obtained, and then the offset of the current resonance peak of the rigid part 1 is compared with the reference value. When the offset of the current resonance peak of the rigid part 1 is the same as the reference value, it means that the battery cell module 3 is in a thermal runaway state, and the detection of the thermal runaway state of the battery cell module 3 is realized, and the influence of temperature and voltage on the detection can be effectively reduced.

[0135] In one embodiment of the present application, the battery system detection method further includes:

[0136] Obtain stress values ​​at different positions of the rigid component 1;

[0137] It can be understood that the detection component is used to detect the stress at different positions of the rigid component 1. By acquiring the detection data of the detection component, the stress values ​​at different positions of the rigid component 1 can be obtained.

[0138] Based on the stress values ​​at different positions of the rigid member 1 , determining the alignment state of the multiple cells of the cell module 3 ;

[0139] It can be understood that when the rigid part 1 fits the battery module 3 and the multiple batteries of the battery module 3 are neatly arranged, that is, when the multiple batteries are aligned, the force exerted by the battery module 3 on the rigid part 1 will be uniform, that is, the stress at different positions of the rigid part 1 should be the same or the difference is less than the preset value. Then, by analyzing the stress at different positions of the rigid part 1, the alignment state of the multiple batteries of the battery module 3 can be determined.

[0140] According to the battery system detection method of the embodiment of the present application, by obtaining the stress values ​​at different positions of the rigid part 1, the stresses at different positions of the rigid part 1 are compared. When the stresses at different positions of the rigid part 1 are the same or the difference is less than a preset value, it means that the force on the rigid part 1 is uniform and the multiple battery cells of the battery cell module 3 are aligned. When the difference in stresses at different positions of the rigid part 1 is greater than a preset value, it means that the force on the rigid part 1 is uneven and the multiple battery cells of the battery cell module 3 are not aligned, thereby realizing the detection of the alignment status of the multiple battery cells of the battery cell module 3.

[0141] In one embodiment of the present application, the step of obtaining stress values ​​at different positions of the rigid member 1 includes:

[0142] Obtaining the shift of the resonance peak at different positions of the rigid member 1;

[0143] Based on the shift of the resonance peaks at different positions of the rigid part 1 , the stress values ​​at different positions of the rigid part 1 are determined.

[0144] It can be understood that when obtaining the stress values ​​at different positions of the rigid part 1, since the stress of the rigid part 1 is different, the offset of the resonance peak of the rigid part 1 will also be different. Therefore, the offset of the resonance peak at different positions of the rigid part 1 can be obtained first, and then the corresponding stress can be calculated based on the offset of the resonance peak, and then the stress values ​​at different positions of the rigid part 1 can be obtained.

[0145] In one embodiment of the present application, the step of obtaining stress values ​​at different positions of the rigid member 1 includes:

[0146] Obtaining the strain amounts of the rigid component 1 at different positions;

[0147] Based on the strain amounts at different positions of the rigid component 1 , the stress values ​​at different positions of the rigid component 1 are determined.

[0148] It can be understood that the stress and strain of the rigid part 1 are corresponding to each other. Therefore, when obtaining the stress values ​​at different positions of the rigid part 1, the strain values ​​at different positions of the rigid part 1 can be obtained first, and then the corresponding stress values ​​can be determined based on the strain values, and then the stress values ​​at different positions of the rigid part 1 can be obtained.

[0149] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery detection device, characterized in that: include: A rigid member, suitable for being sleeved on the battery cell module and being fitted with the outer wall surface of the battery cell module; A resonance detection component is disposed on a side of the rigid member away from the battery module, and is used to detect the deviation of the resonance peak of the rigid member; A control component is electrically connected to the resonance detection component, and the control component is configured to determine the state of the battery cell module based on the shift of the resonance peak of the rigid component.

2. The battery detection device according to claim 1, characterized in that: The resonance detection component includes a resonator, the inner wall surface of the rigid part is suitable for being attached to the battery core module, the resonator is attached to the outer wall surface of the rigid part, and the resonator is used to detect the deviation of the resonance peak of the rigid part.

3. The battery detection device according to claim 2, characterized in that: The resonance detection component includes at least two resonators, wherein: The two resonators are symmetrically distributed about the midline of the rigid member; and / or, The inner wall surface of the rigid part is suitable for fitting with the battery core module, and at least two resonators are evenly distributed on the outer wall surface of the rigid part along the circumference of the rigid part.

4. The battery detection device according to claim 1, characterized in that: The resonance detection component includes a capacitive sensor, which is attached to the outer wall surface of the rigid part. The capacitive sensor is electrically connected to the control component, and the control component is configured to determine the offset of the resonance peak of the rigid part based on the detection data of the capacitive sensor.

5. The battery detection device according to any one of claims 1 to 4, characterized in that: The battery detection device further includes a temperature detection member, which is electrically connected to the control component and is used to detect the temperature of the battery cell module. The control component is configured to: determine the state of the battery cell module based on the shift of the resonance peak of the rigid member and the detection data of the temperature detection member; and / or, The battery detection device also includes a voltage detection element, which is electrically connected to the control component and is used to detect the voltage of the battery cell module. The control component is configured to determine the state of the battery cell module based on the offset of the resonance peak of the rigid component and the detection data of the voltage detection element.

6. The battery testing device according to any one of claims 1 to 4, characterized in that: The rigid part 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 to each other and have the same length, the second rigid part and the fourth rigid part are arranged opposite to each other and have the same length, the length of the first rigid part is smaller than the length of the second rigid part, and the resonance detection component is connected to the middle position of the second rigid part and / or the fourth rigid part.

7. The battery detection device according to claim 6, characterized in that: The ratio of the length of the resonance detection component to the length of the second rigid part is greater than 0.

1.

8. A battery module, characterized in that: It comprises a battery cell module and a battery detection device as claimed in any one of claims 1 to 7, wherein the rigid member is sleeved on the battery cell module.

9. The battery module according to claim 8, characterized in that: The battery detection device comprises at least two rigid parts, and at least two rigid parts are sleeved on the battery core module. The outer wall surface of each rigid part is connected to the resonance detection component.

10. The battery module according to claim 9, characterized in that: The resonant detection components at two adjacent rigid members are symmetrically distributed about a symmetry plane of the two adjacent rigid members.

11. A battery system detection method based on the battery detection device according to any one of claims 1 to 7, characterized in that: include: Obtaining the offset value of the resonance peak of the rigid component; Based on the offset value of the resonance peak, the state of the battery cell module and the preload force applied to the battery cell module are determined.

12. The battery system detection method according to claim 11, characterized in that: The step of determining the state of the battery cell module based on the shift of the resonance peak includes: The health status of the battery module is determined based on the shift of the current resonance peak of the rigid part and a health status database, wherein the health status database includes the shift of the resonance peak of the rigid part when the battery module is in different health states.

13. The battery system detection method according to claim 12, characterized in that: The step of determining the health status of the battery module based on the offset of the current resonance peak of the rigid component and the health status database comprises: Obtaining the current temperature and current voltage of the battery cell module; Determining the health status of the battery cell module based on the current temperature, the current voltage, the shift of the current resonance peak of the rigid member, and the health status database; The health status database includes the displacement of the resonance peak of the rigid part when the battery module is at different temperatures, different voltages and different health states.

14. The battery system detection method according to claim 13, characterized in that: The step of determining the state of the battery cell module based on the shift of the resonance peak includes: Determining that the battery cell module is in a thermal runaway state based on the offset of the current resonance peak of the rigid component and a reference value; The reference value is the offset of the resonance peak of the rigid component when thermal runaway occurs in the battery cell module.

15. The battery system detection method according to claim 14, characterized in that: The step of determining that the battery module is in a thermal runaway state based on the offset of the current resonance peak of the rigid component and the reference value comprises: Obtaining the current temperature and current voltage of the battery cell module; Determining the reference value based on the current temperature, the current voltage and a thermal runaway database, wherein the thermal runaway database includes the shift of the resonance peak of the rigid component when the battery cell module has thermal runaway under different temperature and different voltage conditions; Based on the offset of the current resonance peak of the rigid component and the reference value, it is determined that the battery cell module is in a thermal runaway state.

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