Battery pack with abnormal disassembly detection function

Abstract

The utility model relates to the technical field of safety of energy storage equipment, and discloses a battery pack with an abnormal disassembly detection function. The battery pack with the abnormal disassembly detection function comprises a battery outer box, a battery management system and a detection module, the battery outer box comprises a box body and a box cover, one end of the box body is provided with an opening, and the box cover covers the opening of the box body; the detection module is arranged in the box body and comprises a transmitting end and a receiving end, the transmitting end is used for transmitting electromagnetic waves, the transmitting direction of the electromagnetic waves intersects with the plane where the box cover is located in the covering state, and the receiving end is used for receiving the electromagnetic waves reflected by the box cover and obtaining the distance Dx between the detection module and the box cover; and the battery management system is arranged in the box body and is in communication connection with the detection module, and the battery management system gives out an early warning when Dx is greater than a preset disassembly early warning threshold value D0. The judgment logic of the abnormal disassembly detection function of the battery pack is clear and is not easily influenced by other interference factors such as illumination.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage equipment safety, and in particular to a battery pack with an abnormal disassembly detection function. Background Art

[0002] With the continuous advancement of science and technology, battery packs, as important energy supply units for various electronic devices, are increasingly attracting people's attention for their safety, stability and reliability. In recent years, the application of battery packs in new energy vehicles, smart homes, industrial equipment and other fields has gradually become popular, and the safety performance requirements for battery packs have become increasingly stringent. Against this background, battery pack anti-disassembly technology has emerged and has become one of the key technologies to ensure the safety of battery packs. Battery pack anti-disassembly technology is a technical means developed to prevent battery packs from being illegally disassembled or destroyed. It is mainly to solve the problems of malicious destruction and illegal disassembly that battery packs may face during use, thereby ensuring the integrity of the internal circuit and structure of the battery pack, and preventing safety hazards such as short circuits and fires caused by disassembly or destruction.

[0003] In the prior art, in order to prevent the battery pack from being maliciously damaged or illegally disassembled, a light sensor is usually installed in the battery pack shell. The light sensor can achieve early warning by sensing the contrast change between the black state value in the battery pack and the light intensity at the moment of unpacking. However, the light sensor is extremely sensitive to light. When the battery pack shell is broken due to collision or other reasons, causing the light intensity in the battery pack to change, it is easy to trigger the alarm by mistake. In addition, if the unpacking process is carried out in the dark, the early warning of the light sensor will fail.

[0004] Therefore, it is urgent to propose a battery pack with abnormal disassembly detection function to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a battery pack with an abnormal disassembly detection function, which has clear judgment logic and is not easily affected by other interference factors such as light.

[0006] As conceived above, the technical solution adopted by the utility model is:

[0007] A battery pack with abnormal disassembly detection function, comprising:

[0008] The battery outer box comprises a box body and a box cover, wherein one end of the box body is open, and the box cover is sealed at the opening of the box body;

[0009] A detection module is arranged in the box body, and the detection module includes a transmitting end and a receiving end. The transmitting end is used to transmit electromagnetic waves, and the transmitting direction of the electromagnetic waves intersects with the plane where the box cover is in the closed state. The receiving end is used to receive the electromagnetic waves reflected by the box cover and obtain the distance D between the detection module and the box cover. x ;

[0010] A battery management system is disposed in the box and is in communication with the detection module. The battery management system is in D x Greater than the preset disassembly warning threshold D 0 When an early warning is issued, D 0 is the distance between the box cover and the detection module when the box cover is in a closed state.

[0011] As a preferred solution of the battery pack with abnormal disassembly detection function provided by the utility model, the battery pack also includes a battery module, and the box body is provided with a first chamber and a second chamber that are not connected. The battery module is arranged in the first chamber, and the battery management system and the detection module are both arranged in the second chamber.

[0012] As a preferred solution of the battery pack with abnormal disassembly detection function provided by the utility model, the battery pack with abnormal disassembly detection function also includes a protective box, the protective box cover is arranged outside the transmitting end and the receiving end, and the protective box is provided with a detection hole for the electromagnetic wave to pass through.

[0013] As a preferred solution of the battery pack with abnormal disassembly detection function provided by the utility model, an electromagnetic shielding layer is attached to the inner wall of the protective box.

[0014] As a preferred solution of the battery pack with abnormal disassembly detection function provided by the utility model, the electromagnetic shielding layer is made of aluminum foil, graphene, carbon nanotubes or metal oxide.

[0015] As a preferred solution of the battery pack with abnormal disassembly detection function provided by the utility model, the transmitting end is adhered to the inner top wall of the protective box; and / or the receiving end is adhered to the inner top wall of the protective box.

[0016] As a preferred solution for the battery pack with abnormal disassembly detection function provided by the utility model, the protective box is adhered to the inner bottom of the box body; or the protective box is connected to the inner bottom of the box body by fasteners, riveting, clamping or welding.

[0017] As a preferred solution of the battery pack with abnormal disassembly detection function provided by the utility model, the detection module is an infrared sensor, an ultrasonic ranging sensor or a laser ranging sensor.

[0018] As a preferred solution of the battery pack with abnormal disassembly detection function provided by the utility model, the protective box is made of insulating material.

[0019] As a preferred solution of the battery pack with abnormal disassembly detection function provided by the utility model, a liquid cooling plate is further provided between the battery module and the box cover.

[0020] The beneficial effects of the utility model are:

[0021] The utility model provides a battery pack with an abnormal disassembly detection function. When the battery pack is assembled, the distance between the detection module and the box cover is relatively fixed. At this time, the distance between the detection module and the box cover obtained by the detection module will be determined within a certain numerical range; when the battery pack is maliciously damaged or illegally disassembled, the distance between the detection module and the box cover obtained by the detection module will change. When the distance between the detection module and the box cover exceeds the disassembly warning threshold, it can be determined that the box cover is disassembled or removed. The judgment logic of the abnormal disassembly detection function of the battery pack is clear, and it is not easily affected by other interference factors such as light, and the detection result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of a battery pack with abnormal disassembly detection function provided by an embodiment of the utility model;

[0023] Figure 2 It is a structural schematic diagram of a battery pack with abnormal disassembly detection function provided by an embodiment of the utility model without a box cover;

[0024] Figure 3 is a cross-sectional schematic diagram of a battery pack with abnormal disassembly detection function provided by an embodiment of the utility model;

[0025] Figure 4 It is a structural schematic diagram of a detection module provided by an embodiment of the utility model;

[0026] Figure 5 It is a structural schematic diagram of a battery pack with abnormal disassembly detection function provided by an embodiment of the utility model without the box cover and liquid cooling plate hidden;

[0027] Figure 6 yes Figure 3 A partial enlarged view of point A.

[0028] In the figure:

[0029] 100, battery outer box; 110, box body; 111, first chamber; 112, second chamber; 120, box cover;

[0030] 200. Battery management system;

[0031] 300. Battery module;

[0032] 400, detection module; 410, transmitting end; 420, receiving end;

[0033] 500, liquid cooling plate;

[0034] 600. Protection box; 601. Detection hole. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] Figure 1 A schematic diagram of the structure of a battery pack with abnormal disassembly detection function provided by this embodiment is shown. Figure 2 A schematic structural diagram of a battery pack with a hidden box cover 120 provided in this embodiment and having an abnormal disassembly detection function is shown. Figure 3 A cross-sectional schematic diagram of a battery pack with abnormal disassembly detection function provided by this embodiment is shown. Figure 4 FIG. 4 shows a schematic diagram of the structure of the detection module 400 provided in this embodiment. Figure 1-Figure 4 As shown, this embodiment provides a battery pack with an abnormal disassembly detection function, the battery pack includes a battery outer box 100, a battery management system 200 and a detection module 400, wherein the battery outer box 100 includes a box body 110 and a box cover 120, one end of the box body 110 is open, and the box cover 120 is sealed at the opening of the box body 110; the detection module 400 is arranged in the box body 110, and the detection module 400 includes a transmitting end 410 and a receiving end 420, the transmitting end 410 is used to transmit electromagnetic waves, and the transmitting direction of the electromagnetic waves intersects with the plane where the box cover 120 is in a closed state, and the receiving end 420 is used to receive the electromagnetic waves reflected by the box cover 120, and obtain the distance D between the detection module 400 and the box cover 120. x The battery management system 200 is disposed in the housing 110 and is connected to the detection module 400 for communication. The battery management system 200 is in D x Greater than the preset disassembly warning threshold D 0 When an early warning is issued, D 0 is the distance between the box cover 120 and the detection module 400 when the box cover 120 is in the closed state.

[0040] It should be noted that the D obtained by the detection module 400 x is the distance of the electromagnetic wave from the transmitting end 410 to the intersection of the electromagnetic wave and the box cover 120. When the battery pack is assembled, the box cover 120 is in the closed state, the transmitting end 410 transmits electromagnetic waves in the direction of the box cover 120, and the receiving end 420 receives the electromagnetic waves reflected by the box cover 120. At this time, the distance between the detection module 400 and the box cover 120 obtained by the detection module 400 is D 0When the battery pack is maliciously damaged or illegally disassembled, the box cover 120 is in the process of opening. At this time, the transmitting end 410 does not change the direction of the electromagnetic wave emitted by the transmitting end 410, but the position of the box cover 120 changes due to being opened. There are two situations in which the position of the box cover 120 changes. In the first situation, the box cover 120 is opened in a flipping form, and the electromagnetic wave travels along the path D from the transmitting end 410 to the intersection of the electromagnetic wave and the box cover 120. x Greater than D 0 , at this time, the battery management system 200 issues an unpacking warning; in the second case, when the box cover 120 is opened in a translational manner until it avoids the electromagnetic waves emitted by the transmitting end 410, the electromagnetic waves are emitted outside the box body 110 and are either reflected by the shielding outside the box body 110, or there is no shielding to reflect the electromagnetic waves. In either case, the D obtained by the detection module 400 x Both are greater than D 0 At this time, the battery management system 200 issues an unpacking warning.

[0041] Optionally, the detection module 400 may be an infrared sensor, an ultrasonic distance measuring sensor or a laser distance measuring sensor. This embodiment does not limit the specific type and model of the detection module 400, and designers may select it according to actual needs.

[0042] It is understandable that a vehicle equipped with the above-mentioned battery pack may be subject to collision during driving, causing the battery outer box 100 to be squeezed, so that the distance between the detection module 400 and the box cover 120 changes. In order to avoid the detection module 400 from giving a false alarm due to the above situation, the operator can set the disassembly warning threshold that causes the detection module 400 to alarm as: the sum of the initial distance between the detection module 400 and the box cover 120 and the potential Z-direction deformation amount based on the simulation evaluation of various abuse conditions. This design can eliminate the false alarm caused by the deformation of the box cover 120 when the vehicle is subjected to collision, squeezing, etc., so as to ensure the accuracy of the detection result. Among them, the initial distance between the detection module 400 and the box cover 120 refers to the distance between the detection module 400 and the box cover 120 when the battery pack is assembled and not yet used.

[0043] In the battery pack with abnormal disassembly detection function provided in this embodiment, when the battery pack is assembled, the distance between the detection module 400 and the box cover 120 is relatively fixed. At this time, the distance between the detection module 400 and the box cover 120 obtained by the detection module 400 will be determined within a certain value range; when the battery pack is maliciously damaged or illegally disassembled, the distance between the detection module 400 and the box cover 120 obtained by the detection module 400 will change. When the distance between the detection module 400 and the box cover 120 exceeds the disassembly warning threshold D 0When the battery pack is disassembled or removed, the battery pack cover 120 can be determined to be disassembled or removed. The judgment logic of the abnormal disassembly detection function of the battery pack is clear, and it is not easily affected by other interference factors such as light, and the detection result is more accurate. Figure 5 FIG. 1 shows a schematic diagram of the structure of a battery pack with abnormal disassembly detection function provided in this embodiment without the cover 120 and the liquid cooling plate 500. Figure 5 Combined with Figure 3 As shown, the battery pack also includes a battery module 300. The box body 110 is provided with a first chamber 111 and a second chamber 112 which are not connected. The battery module 300 is provided in the first chamber 111, and the battery management system 200 and the detection module 400 are both provided in the second chamber 112. After the battery pack is assembled, the transmitting end 410 transmits electromagnetic waves at a fixed frequency. After the electromagnetic waves are reflected by the box cover 120, the receiving end 420 receives the electromagnetic wave signals reflected by the box cover 120 and converts the signals into electrical signals for analysis, and calculates the distance D between the detection module 400 and the box cover 120. x The battery management system 200 compares the distance fed back by the detection module 400 with the disassembly warning threshold D 0 In comparison, when the distance D between the detection module 400 and the box cover 120 x Greater than the disassembly warning threshold D 0 When the battery pack 120 is removed, it is judged that the box cover 120 has been removed, and a warning signal is triggered to warn the unpacking personnel of further operation, and the warning information is simultaneously fed back to the battery manufacturer for backup and archiving. The battery pack with abnormal disassembly detection function can monitor the infringing unpacking by competitors and the unauthorized unpacking by users, avoid the safety hazards caused by malicious and illegal unpacking, and reduce the economic losses of battery manufacturers.

[0044] In this embodiment, the first chamber 111 and the second chamber 112 are spaced apart along the first direction, and the battery management system 200 and the detection module 400 are spaced apart along the second direction in the second chamber 112. The first direction refers to the length direction of the box 110, and the second direction refers to the width direction of the box 110. The first direction, the second direction, and the height direction of the box 110 are perpendicular to each other.

[0045] Optionally, a liquid cooling plate 500 is further provided between the battery module 300 and the box cover 120 to cool the heat generated by the battery module 300 during use. The detection module 400 and the battery module 300 are respectively provided in two unconnected chambers, which can also play a moisture-proof role, and prevent the coolant in the liquid cooling plate 500 from leaking and affecting the normal use of the detection module 400, thereby extending the service life of the detection module 400.

[0046] Figure 6 Shows Figure 3A partial enlarged view at point A. Figure 6 Combined with Figure 3 As shown, the battery pack further includes a protection box 600, which is disposed outside the transmitting end 410 and the receiving end 420, and a detection hole 601 for electromagnetic waves to pass through is disposed on the protection box 600. By providing the protection box 600, the transmitting end 410 and the receiving end 420 can be protected to prevent them from being squeezed and damaged when the vehicle collides, so as to further extend the service life of the detection module 400.

[0047] Optionally, an electromagnetic shielding layer is attached to the inner wall of the protective box 600 to prevent electromagnetic interference from affecting the transmitting end 410 and the receiving end 420, thereby ensuring the accuracy of the detection result. In this embodiment, the electromagnetic shielding layer is made of aluminum foil, which is a good electromagnetic shielding material with good conductivity and high reflectivity, and can reflect or absorb electromagnetic waves, thereby reducing their interference with the transmitting end 410 and the receiving end 420. Of course, in other embodiments, the electromagnetic shielding layer can also be made of absorbing materials such as graphene, carbon nanotubes and metal oxides, which is not limited in this embodiment.

[0048] Optionally, the protective box 600 is made of insulating material. In this embodiment, the protective box 600 is made of plastic material, which has good insulation effect and light weight. In other embodiments, the protective box 600 can also be made of other materials, which is not limited in this embodiment.

[0049] In this embodiment, the protection box 600 is adhered to the bottom of the second chamber 112 to ensure that the relative position between the protection box 600 and the box body 110 is fixed, so as to prevent the position of the protection box 600 in the box body 110 from moving due to collision or bumping of the vehicle, thereby affecting the detection result of the detection module 400. Of course, in other embodiments, the protection box 600 can also be connected to the bottom of the second chamber 112 by fasteners, riveting, clamping or welding, which is not limited here.

[0050] Optionally, the transmitting end 410 is adhered to the inner top wall of the protective box 600; and / or the receiving end 420 is adhered to the inner top wall of the protective box 600, so as to fix the relative position between the transmitting end 410 and the protective box 600 and between the receiving end 420 and the protective box 600, so as to avoid displacement of the transmitting end 410 or the receiving end 420 relative to the protective box 600 when the vehicle collides or bumps, thereby affecting the detection result. In addition, by arranging both the transmitting end 410 and the receiving end 420 on the inner top wall of the protective box 600, the distance between the transmitting end 410 and the receiving end 420 and the detection hole 601 can be reduced, so as to achieve the effect of accurately allowing electromagnetic waves to pass through the detection hole 601 with a smaller aperture. In this embodiment, the transmitting end 410 and the protective box 600 are connected by sealant, and the receiving end 420 and the protective box 600 are connected by sealant.

[0051] It should be noted that the present embodiment does not limit the specific structures of the battery management system 200 and the battery module 300 , and any type of battery management system 200 and battery module 300 in the prior art are within the protection scope of the present embodiment.

[0052] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A battery pack with abnormal disassembly detection function, characterized in that: include: A battery outer box (100) comprises a box body (110) and a box cover (120); one end of the box body (110) is open, and the box cover (120) is sealed at the opening of the box body (110); A detection module (400) is arranged in the box body (110), the detection module (400) comprises a transmitting end (410) and a receiving end (420), the transmitting end (410) is used to transmit electromagnetic waves, and the transmitting direction of the electromagnetic waves intersects with the plane where the box cover (120) is located in a closed state, and the receiving end (420) is used to receive the electromagnetic waves reflected by the box cover (120) and obtain the distance D between the detection module (400) and the box cover (120). x ; A battery management system (200) is disposed in the box (110) and is in communication connection with the detection module (400). The battery management system (200) is x When the distance is greater than a preset disassembly warning threshold value D0, a warning is issued, wherein D0 is the distance between the box cover (120) in a closed state and the detection module (400).

2. The battery pack with abnormal disassembly detection function according to claim 1, characterized in that: The battery pack further comprises a battery module (300); a first chamber (111) and a second chamber (112) which are not connected are arranged in the box body (110); the battery module (300) is arranged in the first chamber (111); and the battery management system (200) and the detection module (400) are both arranged in the second chamber (112).

3. The battery pack with abnormal disassembly detection function according to claim 1, characterized in that: The battery pack with abnormal disassembly detection function also includes a protection box (600), the protection box (600) is arranged outside the transmitting end (410) and the receiving end (420), and the protection box (600) is provided with a detection hole (601) for the electromagnetic wave to pass through.

4. The battery pack with abnormal disassembly detection function according to claim 3, characterized in that: An electromagnetic shielding layer is attached to the inner wall of the protection box (600).

5. The battery pack with abnormal disassembly detection function according to claim 4, characterized in that: The electromagnetic shielding layer is made of aluminum foil, graphene, carbon nanotubes or metal oxide.

6. The battery pack with abnormal disassembly detection function according to claim 3, characterized in that: The transmitting end (410) is adhered to the inner top wall of the protective box (600); and / or the receiving end (420) is adhered to the inner top wall of the protective box (600).

7. The battery pack with abnormal disassembly detection function according to claim 3, characterized in that: The protection box (600) is adhered to the inner bottom of the box body (110); or the protection box (600) is connected to the inner bottom of the box body (110) by means of fasteners, riveting, clamping or welding.

8. The battery pack with abnormal disassembly detection function according to claim 3, characterized in that: The detection module (400) is an infrared sensor, an ultrasonic distance measurement sensor or a laser distance measurement sensor.

9. The battery pack with abnormal disassembly detection function according to claim 3, characterized in that: The protection box (600) is made of insulating material.

10. The battery pack with abnormal disassembly detection function according to claim 1, characterized in that: The battery pack further comprises a battery module (300) arranged in the box body (110), and a liquid cooling plate (500) is further arranged between the battery module (300) and the box cover (120).

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