Battery module anomaly detection device based on thickness and width multi-dimensional combined monitoring

Abstract

The invention provides a battery module anomaly detection device based on thickness and width multi-dimensional combined monitoring, which comprises a transverse clamp, a first expansive force detection device, a longitudinal clamp and a second expansive force detection device, the large surface and the side surface of the to-be-tested battery module are simultaneously clamped by the transverse clamp and the longitudinal clamp along the thickness direction and the width direction of the to-be-tested battery module respectively, and force is simultaneously applied to the large surface and the side surface of the to-be-tested battery module; through the first expansive force detection device and the second expansive force detection device, accurate measurement of large-surface expansive force in the thickness direction of the battery module and side-surface expansive force in the width direction of the battery module can be realized, and in-situ accurate sensing of force signals in different directions of the battery module is realized. Through combined monitoring of thickness and width multi-dimensional force signals of a to-be-detected battery module, monitoring of the running state of the battery is realized through the detected force signals.

Description

Technical Field

[0001] The present application relates to the technical field of battery module abnormality detection, and specifically to a battery module abnormality detection device based on multi-dimensional joint monitoring of thickness and width. Background Art

[0002] Electrochemical energy storage technology represented by lithium batteries is an important support for building new power systems. In recent years, global lithium battery energy storage has developed rapidly. However, safety accidents in energy storage power stations occur frequently. The root cause of safety accidents in energy storage power stations is: battery thermal runaway. Thermal runaway is often caused by the battery triggering safety failure and further evolution during operation. The further spread of thermal runaway batteries will lead to catastrophic consequences such as fire or explosion. Timely and accurate safety warnings in the early stages of battery failure are an effective means to reduce the harm of accidents.

[0003] During the normal operation of lithium batteries, the deintercalation of lithium from the positive and negative electrode materials will cause the battery to swell and produce reversible deformation. Battery failure is usually accompanied by the evolution of internal defects, such as lithium precipitation and gas production, which cause irreversible deformation of the battery. The essence of battery failure is that side reactions occur inside, and the accumulation of reaction products leads to changes in force. The force signal can show abnormal characteristics earlier in the heat accumulation process before the battery fails. Therefore, by detecting the mechanical signal of the battery, there is a greater warning margin for battery safety failure. During operation, the battery will expand in the direction of battery thickness (i.e. along the large surface of the battery) and battery width (i.e. along the side of the battery). Therefore, there is an urgent need for a battery module abnormality detection device that can jointly monitor multi-dimensional force signals based on thickness and width, so as to achieve a more effective warning effect of battery failure. Summary of the invention

[0004] In view of the technical problems existing in the background technology, the present application provides a battery module abnormality detection device based on multi-dimensional joint monitoring of thickness and width. Through the first expansion force detection device and the second expansion force detection device, it is possible to accurately measure the large-surface expansion force in the thickness direction of the battery module and the side expansion force in the width direction of the battery module, thereby realizing in-situ accurate perception of force signals in different directions of the battery module, and jointly monitoring the multi-dimensional force signals of the thickness and width of the battery module to be tested, and then realizing the monitoring of the battery operating status through the detected force signals, thereby achieving the technical effect of being able to more effectively warn of battery failures.

[0005] In a first aspect, an embodiment of the present application provides a battery module abnormality detection device based on multi-dimensional joint monitoring of thickness and width, comprising:

[0006] A transverse clamp, used for clamping the battery module to be tested along the thickness direction of the battery module to be tested;

[0007] A first expansion force detection device, which is disposed between the transverse clamp and the battery module to be tested and contacts the large surface of the battery module to be tested, and is used to detect the expansion force of the large surface of the battery module to be tested when the battery fails;

[0008] A longitudinal clamp, used for clamping the battery module to be tested along the width direction of the battery module to be tested;

[0009] The second expansion force detection device is arranged between the longitudinal clamp and the battery module to be tested and contacts the side of the battery module to be tested, and is used to detect the expansion force of the side of the battery module to be tested when the battery fails.

[0010] In the technical solution of the embodiment of the present application, the first expansion force detection device and the second expansion force detection device can realize accurate measurement of the large-surface expansion force in the thickness direction of the battery module and the side expansion force in the width direction of the battery module, thereby realizing in-situ accurate perception of force signals in different directions of the battery module, and jointly monitoring the multi-dimensional force signals of the thickness and width of the battery module to be tested, and then monitoring the battery operating status through the detected force signals.

[0011] In some embodiments, the transverse clamp includes a first clamping plate, a second clamping plate, a first screw and a nut, the first clamping plate and the second clamping plate are movably arranged on the screw, and a first clamping space is formed between the first clamping plate and the second clamping plate, the battery module to be tested and the first expansion force detection device are both placed in the first clamping space, and the nut is arranged on both sides of the first screw for adjusting the pre-tightening force applied by the first clamping plate and the second clamping plate to the large surface of the battery module to be tested.

[0012] In this embodiment, the clamping force of the first clamping plate and the second clamping plate on the large surface of the battery module to be tested is adjusted by tightening the nut, thereby truly simulating the preload force encountered by the large surface of the battery module during the assembly process.

[0013] In some embodiments, the first expansion force detection device includes a first movable plate and a first expansion force sensor. The first movable plate is arranged in the first clamping space and is tightly attached to a large surface of one side of the battery module to be tested. The first expansion force sensor is arranged between the first movable plate and the first clamping plate.

[0014] In this embodiment, a more accurate expansion force value of the large surface of the battery module to be tested when it expands can be obtained through the first movable plate and the first expansion force sensor.

[0015] In some embodiments, thermal insulation pads are also included. A group of thermal insulation pads are respectively disposed on the large surfaces on both sides of the battery module to be tested, and the thermal insulation pads are bonded to the battery module to be tested.

[0016] In this embodiment, the heat insulation effect of the battery module abnormality detection device is increased by using a heat insulation pad, thereby reducing the heat loss of the battery module to be tested during the detection process.

[0017] In some embodiments, the thermal insulation pad has the same area as the large surface of the battery module to be tested.

[0018] In this embodiment, the thermal insulation pad can not only reduce the heat loss of the battery module to be tested during the testing process, but also the thermal insulation pad itself has a certain thickness. Therefore, it can prevent the first clamp and the second clamp from contacting the longitudinal clamp when the battery module to be tested is fixed on the transverse clamp and the longitudinal clamp, thereby increasing the accuracy of the first expansion force detection device and the second expansion force detection device in detecting the expansion force of the battery module to be tested.

[0019] In some embodiments, a battery support plate is further included, and slots are set on the first clamping plate and the second clamping plate. The battery support plate passes through the first clamping plate and the second clamping plate in sequence through the slots, and the battery support plate is used to support the battery module to be tested.

[0020] In this embodiment, the battery support plate can not only support the battery module to be tested, so that the battery module to be tested is placed on the battery support plate and ensures that the battery cells of the battery module to be tested can be arranged neatly in sequence, but also enable the battery module to be tested to be suspended in the battery module abnormality detection device, thereby reducing heat leakage from the battery module to be tested to the operating platform.

[0021] In some embodiments, the longitudinal clamp includes a third clamping plate, a fourth clamping plate, a second screw and a nut, the second screw and the first screw are arranged perpendicular to each other, the third clamping plate and the fourth clamping plate are slidably arranged on the second screw to form a second clamping space overlapping with the first clamping space, the battery module to be tested is placed in the second clamping space, and the nuts are arranged on both sides of the second screw to adjust the pre-tightening force applied by the third clamping plate and the fourth clamping plate to the side of the battery module to be tested.

[0022] In this embodiment, the clamping force of the third clamping plate and the fourth clamping plate on the side of the battery module to be tested is adjusted by tightening the nut, thereby truly simulating the preload force encountered by the side of the battery module during the assembly process.

[0023] In some embodiments, the second expansion force detection device includes a second movable plate and a second expansion force sensor, the second movable plate is arranged in the second clamping space and is tightly attached to one side of the battery module to be tested, and the second expansion force sensor is arranged between the second movable plate and the third clamping plate.

[0024] In this embodiment, the measured battery module pushes the second movable plate, thereby pressing the expansion force sensor, thereby obtaining a more accurate expansion force value when the side of the measured battery module expands.

[0025] In some embodiments, the third clamping plate, the fourth clamping plate and the second movable plate have the same area as the side surface of the battery module to be tested.

[0026] In this embodiment, the third clamp, the fourth clamp and the second movable plate having the same side area as the battery module to be tested can effectively prevent the transverse clamp and the longitudinal clamp from contacting each other during use, further improving the accuracy of the first expansion force detection device and the second expansion force detection device in detecting the expansion force of the battery module to be tested.

[0027] In some embodiments, bottom ends of the first clamping plate, the second clamping plate, the third clamping plate, and the fourth clamping plate are all in the same horizontal plane.

[0028] In this embodiment, the first clamp, the second clamp, the third clamp and the fourth clamp whose bottom ends are all in the same horizontal plane allow the transverse clamp and the longitudinal clamp to touch the ground at the same time, greatly improving the stability of the battery module abnormality detection device during reuse.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the structure of a battery module abnormality detection device based on multi-dimensional joint monitoring of thickness and width provided in an embodiment of the present application;

[0032] Figure 2 Schematic diagram of the structure of the transverse clamp in the embodiment of the present application.

[0033] Description of reference numerals:

[0034] 1. Battery module to be tested; 2. First clamping plate; 3. Second clamping plate; 4. First screw rod; 5. Nut;

[0035] 6. First movable plate; 7. First expansion force sensor; 8. Heat insulation pad; 9. Battery support plate;

[0036] 10. slot; 11. third clamping plate; 12. fourth clamping plate; 13. second screw rod;

[0037] 14. Second movable plate; 15. Second expansion force sensor; 16. Positive electrode tab; 17. Negative electrode tab. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0041] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] Electrochemical energy storage technology represented by lithium batteries is an important support for building new power systems. In recent years, global lithium battery energy storage has developed rapidly. However, safety accidents in energy storage power stations occur frequently. The root cause of safety accidents in energy storage power stations is: battery thermal runaway. Thermal runaway is often caused by the battery triggering safety failure and further evolution during operation. The further spread of thermal runaway batteries will lead to catastrophic consequences such as fire or explosion. Timely and accurate safety warnings in the early stages of battery failure are an effective means to reduce the harm of accidents.

[0047] During the normal operation of lithium batteries, the deintercalation of lithium from the positive and negative electrode materials will cause the battery to swell and produce reversible deformation. Battery failure is usually accompanied by the evolution of internal defects, such as lithium precipitation and gas production, which cause irreversible deformation of the battery. The essence of battery failure is that side reactions occur inside, and the accumulation of reaction products leads to changes in force. The force signal can show abnormal characteristics earlier in the heat accumulation process before the battery fails. Therefore, by detecting the mechanical signal of the battery, there is a greater warning margin for battery safety failure. During operation, the battery will expand in the direction of battery thickness (i.e. along the large surface of the battery) and battery width (i.e. along the side of the battery). Therefore, there is an urgent need for a battery module abnormality detection device that can jointly monitor multi-dimensional force signals based on thickness and width, so as to achieve a more effective warning effect of battery failure.

[0048] In order to solve the technical problem of how to provide a battery module abnormality detection device that can jointly monitor multi-dimensional force signals based on thickness and width to achieve a more effective early warning effect of battery failure, the present application provides a battery module abnormality detection device based on multi-dimensional joint monitoring of thickness and width. Through a first expansion force detection device and a second expansion force detection device, it is possible to accurately measure the large-surface expansion force in the thickness direction of the battery module and the side expansion force in the width direction of the battery module, thereby realizing in-situ accurate perception of force signals in different directions of the battery module, and jointly monitoring the multi-dimensional force signals of the thickness and width of the battery module 1 to be tested, and then realizing the monitoring of the battery operating status through the detected force signals, thereby achieving a more effective technical effect of early warning of battery failure.

[0049] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a battery module abnormality detection device based on multi-dimensional joint monitoring of thickness and width provided for an embodiment of the present application, which is used to detect the abnormal state of a battery module 1 to be tested, comprising: a transverse clamp, a first expansion force detection device, a longitudinal clamp and a second expansion force detection device, wherein the transverse clamp is used to clamp the battery module 1 to be tested along the thickness direction of the battery module 1 to be tested; the longitudinal clamp is used to clamp the battery module 1 to be tested along the width direction of the battery module 1 to be tested; the first expansion force detection device, the first expansion force detection device is arranged between the transverse clamp and the battery module 1 to be tested, and is in contact with the large surface of the battery module 1 to be tested, and is used to detect the expansion force of the large surface of the battery module 1 to be tested when the battery fails; the second expansion force detection device, the second expansion force detection device is arranged between the longitudinal clamp and the battery module 1 to be tested, and is in contact with the side of the battery module 1 to be tested, and is used to detect the expansion force of the side of the battery module 1 to be tested when the battery fails.

[0050] Specifically, the battery module 1 to be tested is composed of multiple batteries connected in series and parallel through a connecting row; when the battery module 1 to be tested is placed in the device, the large surface and side surfaces of the battery module 1 to be tested are clamped simultaneously along the thickness direction of the battery module 1 to be tested and the width direction of the battery module 1 to be tested by a transverse clamp and a longitudinal clamp respectively, and force is applied to the large surface and side surfaces of the battery module 1 to be tested at the same time, thereby truly simulating the preload force encountered by the battery during the assembly process, connecting the positive and negative pole ears of the battery module 1 to be tested to a charger and discharger, and continuously charging the battery module 1 to be tested through the charger and discharger, so that the battery module 1 to be tested triggers thermal runaway. After the battery module 1 to be tested thermally runs away, gas is generated inside the battery, which causes the battery module 1 to be tested to expand. At this time, the first expansion force detection device and the second expansion force detection device can realize accurate measurement of the large-surface expansion force in the thickness direction of the battery module and the lateral expansion force in the width direction of the battery module, thereby realizing in-situ accurate perception of force signals in different directions of the battery module. By jointly monitoring the multi-dimensional force signals of the thickness and width of the battery module 1 to be tested, the battery operating status can be monitored through the detected force signals.

[0051] Further, Figure 2 This is a structural schematic diagram of the transverse clamp in the embodiment of the present application. In the embodiment of the present application, the transverse clamp includes a first clamping plate 2, a second clamping plate 3, a first screw 4 and a nut 5. The first clamping plate 2 and the second clamping plate 3 are movably arranged on the screw, and a first clamping space is formed between the first clamping plate 2 and the second clamping plate 3. The battery module 1 to be tested and the first expansion force detection device are both placed in the first clamping space, and the nut 5 is arranged on both sides of the first screw 4. During use, the battery to be tested is placed in the first clamping space, and the nut 5 is tightened to adjust the clamping force of the first clamping plate 2 and the second clamping plate 3 on the large surface of the battery module 1 to be tested, thereby being able to truly simulate the preload force encountered by the large surface of the battery module during the assembly process.

[0052] Furthermore, in the embodiment of the present application, the first expansion force detection device includes a first movable plate 6 and a first expansion force sensor 7. The first movable plate 6 is arranged in the first clamping space and is tightly attached to a large surface of one side of the battery to be tested. The first expansion force sensor 7 is arranged between the first movable plate 6 and the first clamping plate 2.

[0053] During use, when the transverse clamp is clamping the battery module 1 to be tested, the second clamping plate 3 is in direct contact with one large surface of the battery module 1 to be tested, and the first clamping plate 2 is against the other large surface of the battery module 1 to be tested through the first movable plate 6. When the battery module 1 to be tested has thermal runaway, gas will be generated inside the battery module 1 to be tested, thereby causing the battery to be tested to expand. During the expansion of the battery to be tested, the battery module 1 to be tested pushes the first movable plate, and the first movable plate 6 presses the expansion force sensor, thereby obtaining a more accurate expansion force value of the large surface of the battery module 1 to be tested when it expands.

[0054] Furthermore, in the embodiment of the present application, a thermal insulation pad 8 is also included. A group of thermal insulation pads 8 are respectively arranged on the large surfaces on both sides of the battery module 1 to be tested. The thermal insulation pads 8 are in contact with the battery module 1 to be tested. The thermal insulation effect of the battery module abnormality detection device is increased by the thermal insulation pads 8, thereby reducing the heat loss of the battery module 1 to be tested during the detection process.

[0055] Furthermore, in the embodiment of the present application, the area of ​​the thermal insulation pad 8 is the same as the large surface of the battery module 1 to be tested. When the thermal insulation pad 8 is combined with the large surface of the battery module 1 to be tested, the thermal insulation pad 8 completely overlaps with the large surface of the battery module 1 to be tested, which can not only reduce the heat loss of the battery module 1 to be tested during the detection process, but also the thermal insulation pad 8 itself has a certain thickness. Therefore, when the battery module 1 to be tested is fixed on the transverse clamp and the longitudinal clamp, the first clamp 2 and the second clamp 3 are prevented from contacting the longitudinal clamp, thereby increasing the accuracy of the first expansion force detection device and the second expansion force detection device in detecting the expansion force of the battery module 1 to be tested.

[0056] Furthermore, in the embodiment of the present application, a battery support plate 9 is also included, and a slot 10 is arranged on the first clamp plate 2 and the second clamp plate 3. The battery support plate 9 passes through the first clamp plate 2 and the second clamp plate 3 in sequence through the slot 10. When the battery module 1 to be tested is placed in the battery module abnormality detection device, the battery support plate 9 can not only support the battery module 1 to be tested, so that the battery module 1 to be tested is placed on the battery support plate 9 and ensures that the various battery cells of the battery module 1 to be tested can be arranged neatly in sequence, but also enable the battery module 1 to be tested to be suspended in the battery module abnormality detection device, thereby reducing heat leakage from the battery module 1 to be tested to the operating platform.

[0057] Furthermore, in an embodiment of the present application, the longitudinal clamp includes a third clamping plate 11, a fourth clamping plate 12, a second screw 13 and a nut 5, the second screw 13 and the first screw 4 are arranged perpendicular to each other, the third clamping plate 11 and the fourth clamping plate 12 are slidably arranged on the second screw 13, and form a second clamping space overlapping with the first clamping space, the battery module 1 to be tested is placed in the second clamping space, the nut 5 is arranged on both sides of the second screw 13, during use, the battery to be tested is placed in the second clamping space overlapping with the first clamping space, and the nut 5 is tightened to adjust the clamping force of the third clamping plate 11 and the fourth clamping plate 12 on the side of the battery module 1 to be tested, thereby being able to truly simulate the preload force encountered by the side of the battery module during the assembly process.

[0058] Furthermore, in the embodiment of the present application, the second expansion force detection device includes a second movable plate 14 and a second expansion force sensor 15. The second movable plate 14 is arranged in the second clamping space and is tightly attached to one side of the battery to be tested. The second expansion force sensor 15 is arranged between the second movable plate 14 and the third clamping plate 11.

[0059] During use, when the longitudinal clamp is clamping the battery module 1 to be tested, the fourth clamping plate 12 is in direct contact with one side of the test surface of the battery module 1 to be tested, and the third clamping plate 11 is against the other side of the large surface of the battery module 1 to be tested through the second movable plate 14. When the battery module 1 to be tested has thermal runaway, gas will be generated inside the battery module 1 to be tested, thereby causing the battery to be tested to expand. During the expansion of the battery to be tested, the battery module 1 to be tested pushes the second movable plate 14, and at this time, the second movable plate 14 presses the expansion force sensor, thereby obtaining a more accurate expansion force value when the side of the battery module 1 to be tested expands.

[0060] Furthermore, in the embodiment of the present application, the third clamp 11, the fourth clamp 12 and the second movable plate 14 have the same area as the side of the battery module 1 to be tested, which can effectively prevent the transverse clamp and the longitudinal clamp from contacting each other during use, and further improve the accuracy of the first expansion force detection device and the second expansion force detection device in detecting the expansion force of the battery module 1 to be tested.

[0061] Furthermore, in the embodiment of the present application, the bottom ends of the first clamp 2, the second clamp 3, the third clamp 11 and the fourth clamp 12 are all in the same horizontal plane, so that the transverse clamp and the longitudinal clamp can touch the ground at the same time, which greatly improves the stability of the battery module abnormality detection device during reuse.

[0062] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A battery module abnormality detection device based on thickness and width multi-dimensional joint monitoring, used to detect the abnormal state of a battery module to be tested, characterized in that: include: A transverse clamp, used for clamping the battery module to be tested along the thickness direction of the battery module to be tested; A first expansion force detection device, which is disposed between the transverse clamp and the battery module to be tested and contacts the large surface of the battery module to be tested, and is used to detect the expansion force of the large surface of the battery module to be tested when the battery fails; A longitudinal clamp, used for clamping the battery module to be tested along the width direction of the battery module to be tested; The second expansion force detection device is arranged between the longitudinal clamp and the battery module to be tested and contacts the side of the battery module to be tested, and is used to detect the expansion force of the side of the battery module to be tested when the battery fails.

2. The battery module abnormality detection device based on thickness and width multi-dimensional joint monitoring according to claim 1 is characterized in that: The transverse clamp includes a first clamping plate, a second clamping plate, a first screw and a nut. The first clamping plate and the second clamping plate are movably arranged on the first screw, and a first clamping space is formed between the first clamping plate and the second clamping plate. The battery module to be tested and the first expansion force detection device are both placed in the first clamping space. The nut is arranged on both sides of the first screw to adjust the pre-tightening force applied by the first clamping plate and the second clamping plate to the large surface of the battery module to be tested.

3. The battery module abnormality detection device based on thickness and width multi-dimensional joint monitoring according to claim 2 is characterized in that: The first expansion force detection device includes a first movable plate and a first expansion force sensor. The first movable plate is arranged in the first clamping space and is in close contact with a large surface of one side of the battery module to be tested. The first expansion force sensor is arranged between the first movable plate and the first clamping plate.

4. The battery module abnormality detection device based on thickness and width multi-dimensional joint monitoring according to claim 2 is characterized in that: It also includes a heat insulation pad. A group of the heat insulation pads are respectively arranged on the large surfaces of both sides of the battery module to be tested, and the heat insulation pads are bonded to the battery module to be tested.

5. The battery module abnormality detection device based on thickness and width multi-dimensional joint monitoring according to claim 4 is characterized in that: The thermal insulation pad has the same area as the large surface of the battery module to be tested.

6. The battery module abnormality detection device based on thickness and width multi-dimensional joint monitoring according to claim 2 is characterized in that: It also includes a battery support plate, wherein slots are arranged on the first clamping plate and the second clamping plate, and the battery support plate passes through the first clamping plate and the second clamping plate in sequence through the slots, and the battery support plate is used to support the battery module to be tested.

7. The battery module abnormality detection device based on thickness and width multi-dimensional joint monitoring according to claim 2 is characterized in that: The longitudinal clamp includes a third clamping plate, a fourth clamping plate, a second screw and a nut. The second screw and the first screw are arranged perpendicular to each other. The third clamping plate and the fourth clamping plate are slidably arranged on the second screw to form a second clamping space overlapping the first clamping space. The battery module to be tested is placed in the second clamping space. The nuts are arranged on both sides of the second screw to adjust the pre-tightening force applied by the third clamping plate and the fourth clamping plate to the side of the battery module to be tested.

8. The battery module abnormality detection device based on thickness and width multi-dimensional joint monitoring according to claim 7 is characterized in that: The second expansion force detection device includes a second movable plate and a second expansion force sensor. The second movable plate is arranged in the second clamping space and is tightly attached to one side of the battery module to be tested. The second expansion force sensor is arranged between the second movable plate and the third clamping plate.

9. The battery module abnormality detection device based on thickness and width multi-dimensional joint monitoring according to claim 8, characterized in that: The third clamping plate, the fourth clamping plate and the second movable plate have the same area as the side surface of the battery module to be tested.

10. The battery module abnormality detection device based on thickness and width multi-dimensional joint monitoring according to claim 7, characterized in that: The bottom ends of the first clamping plate, the second clamping plate, the third clamping plate and the fourth clamping plate are all in the same horizontal plane.

Images