A battery pack device with box deformation monitoring and heating functions

Abstract

The present invention discloses a battery pack device with case deformation monitoring and heating functions, including a battery pack composed of multiple battery packs connected in series, at least one set of combined panels for monitoring whether the battery pack is deformed is fixed on the surface of the battery pack, including a first monitoring component and a second monitoring component that can contact each other to form a passage, the first monitoring component and the second monitoring component are separated from each other by a partition that is damaged by collision; the first monitoring component and the second monitoring component are respectively connected to the first terminal and the second terminal of the monitoring signal input port of the monitoring control module. The present invention can heat the battery pack when the battery pack is in a low temperature environment, and can also timely detect the deformation of the battery pack case that is sufficient to affect the battery pack when the battery pack is deformed by external force and issue an alarm.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a battery pack device with box deformation monitoring and heating functions. Background Art

[0002] In recent years, electric vehicles using lithium-ion batteries have been rapidly popularized at home and abroad. Lithium-ion batteries have the characteristics of increasing internal resistance and worse charging and discharging performance at low temperatures below 10°C. Charging is not allowed when the temperature is too low. In order to ensure the charging and discharging performance of the battery system in a low-temperature environment, a heating device is usually required to increase the temperature of the battery at low temperatures. The usual practice is to install a heating film or heating sheet made of a resistor material in the battery pack, or to install a heat exchange plate or heat exchange pipe in the battery pack, and heat the battery by the flow of heat exchange fluid in the heat exchange plate or heat exchange pipe. In addition, due to the flammable nature of lithium-ion battery electrolyte, when the battery pack with the battery pack installed is impacted by external force, if the battery pack box is deformed, it may cause a short circuit fault or electrolyte leakage in the battery pack, further leading to a thermal runaway accident. In order to detect and confirm the risk of failure of lithium-ion batteries due to abnormal impact and extrusion deformation as early as possible, a suitable monitoring device is required. At present, how to design a heating device and a deformation monitoring device on the battery pack at the same time, and ensure the functionality of the two without interfering with each other is the current problem.

[0003] The application number 201220253829.9, “An Electric Vehicle Power Battery Pack Collision Detection Device”, provides an electric vehicle power battery pack collision detection device. The detection device includes a detection circuit for detecting whether the battery pack shell is deformed, a control chip connected to the detection circuit, and an alarm device connected to the control chip. When the conductor on the battery pack shell in the detection circuit is disconnected due to shell collision deformation, the control chip detects the disconnection state and sends an alarm signal.

[0004] The battery pack abnormality detection device and battery pack abnormality detection method with application number 201710167178.9 provides a battery pack abnormality detection device and a battery pack abnormality detection method, wherein the device comprises: an air pressure sensor, a strain type pressure sensor and a processor, the air pressure sensor and the strain type pressure sensor are located inside the battery pack; the air pressure sensor is connected to the processor, and the air pressure sensor is used to detect the air pressure inside the battery pack; the strain type pressure sensor is connected to the processor, and the strain type pressure sensor is used to detect the inner wall pressure of the battery pack; the processor is used to determine whether the battery pack has an abnormality based on the first pressure value collected by the air pressure sensor and the second pressure value collected by the strain type pressure sensor, and generate a first alarm message when it is determined that the battery pack has an abnormality.

[0005] "Board collision monitoring method, board, battery pack and vehicle" with application number 202011170309.7 provides a method of arranging a detection piece on the board, connecting the detection piece to the connection terminal of the control system, monitoring whether the detection piece is conductive through the control system, and determining whether the board surface of the board is subjected to external collision based on whether the detection piece is conductive.

[0006] "Battery Pack Warning Method System Device and Storage Medium" with application number 202210903785.8 provides a battery pack warning method, system, device and storage medium. The collision situation of the battery pack is monitored by the acceleration sensor and pressure sensor on the battery pack to obtain collision monitoring data and air pressure monitoring data, and then determine whether the battery pack has a safety risk based on the collision monitoring data and air pressure monitoring data. If the battery pack has a safety risk, a safety warning is issued for the battery pack.

[0007] Among the above-mentioned schemes, the disadvantage of the "A Collision Detection Device for Electric Vehicle Power Battery Pack" with application number 201220253829.9 is that when a poor contact failure of the connector occurs in the detection circuit, or when the conductor connector on the battery pack casing is disconnected due to the bumping and vibration of the vehicle body, the system will issue a false alarm message that the battery pack has been hit.

[0008] The disadvantages of the "Battery Pack Abnormal Detection Device and Battery Pack Abnormal Detection Method" with application number 201710167178.9 and the "Battery Pack Early Warning Method System Device and Storage Medium" with application number 202210903785.8 are that when the whole vehicle encounters an accident squeeze while driving at a low speed, causing the battery pack to deform, or the battery pack is only partially hit by a sharp object and ruptures and deforms, causing the battery cells to leak, the acceleration of the battery pack does not reach the threshold value sufficient to wake up the acceleration sensor to start the early warning, or the pressure sensor in the device does not detect abnormal pressure in the battery pack. At this time, the battery pack has a safety hazard, but the system does not warn. Therefore, this technical solution has the risk of underreporting.

[0009] The disadvantage of the "Plate Collision Monitoring Method, Plate, Battery Pack and Vehicle" with application number 202011170309.7 is that when the battery pack encounters temperature changes and the shell of the lithium-ion battery expands to a certain extent after long-term use, and is affected by factors such as vehicle driving vibration, there is a lack of suitable separators between the two detection plates that are close to each other, which may cause false alarms in this scheme. Summary of the invention

[0010] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a battery pack device which can effectively prevent false alarms and missed alarms of battery box deformation and has box deformation monitoring and heating functions.

[0011] To achieve this object, the battery pack device with box deformation monitoring and heating functions designed in the present invention includes a battery group composed of multiple battery packs connected in series, and at least one set of combined panels for monitoring whether the battery pack is deformed is fixed on the surface of the battery pack, which includes a first monitoring component and a second monitoring component that can contact each other to form a passage, and the first monitoring component and the second monitoring component are separated from each other by a partition that is damaged by collision; the first monitoring component and the second monitoring component are respectively connected to the first terminal and the second terminal of the monitoring signal input port of the monitoring control module.

[0012] Furthermore, the combined panel includes a first monitoring board and a second monitoring board, the first monitoring board is fixed to the surface of the battery pack, the first monitoring component is fixed to the side surface of the first monitoring board facing away from the battery pack, the second monitoring component is fixed to the side surface of the second monitoring board facing the first monitoring board, and the partition is fixed between the first monitoring component and the second monitoring component.

[0013] Furthermore, the first monitoring component is a conductive monitoring grid structure, which includes a plurality of conductive strips arranged at intervals along the length direction of the first monitoring board.

[0014] Furthermore, the monitoring grid structure includes an upper monitoring grid structure and a lower monitoring grid structure, and the conductive strips include upper conductive strips and lower conductive strips; the upper monitoring grid structure includes a plurality of upper conductive strips arranged at intervals along the length direction of the first monitoring board, and the lower monitoring grid structure includes a plurality of lower conductive strips arranged at intervals along the length direction of the first monitoring board; the upper conductive strips and the lower conductive strips are alternately arranged at intervals along the length direction of the first monitoring board.

[0015] Furthermore, the upper monitoring grid structure also includes an upper conductive transverse monitoring rod arranged along the length direction of the first monitoring board, and the upper conductive strip is vertically connected to the bottom of the upper transverse monitoring rod at intervals along the length direction of the first monitoring board.

[0016] Furthermore, the lower monitoring grid structure also includes a conductive lower transverse monitoring rod arranged along the length direction of the first monitoring board, and the lower conductive strip is vertically connected to the top of the lower transverse monitoring rod at intervals along the length direction of the first monitoring board.

[0017] Furthermore, a heating component is fixed between the gaps between two adjacent conductive strips, the battery pack is connected to a heating control module, the heating control module is connected to the heating component, and the heating component is fixed on the first monitoring board.

[0018] Furthermore, the heating assembly includes a plurality of straight rod heating conductors fixed between two adjacent upper conductive strips and the lower conductive strips and a cross rod heating conductor connected between the tops or bottoms of two adjacent straight rod heating conductors.

[0019] Furthermore, the partition is a porous partition, which includes through holes arranged in a matrix.

[0020] Furthermore, the second monitoring assembly is a conductive transverse monitoring grid structure, which includes a plurality of transverse monitoring rods arranged at intervals along the width direction of the second monitoring plate.

[0021] Furthermore, the first monitoring component and the second monitoring component are arranged opposite to each other, and the conductive coverage range of the first monitoring component and the second monitoring component is the same.

[0022] The beneficial effects of the present invention are as follows: the present invention controls the heating component through the heating control module and connects the monitoring component through the monitoring control module, which can not only heat the battery pack when the battery pack is in a low temperature environment, so that the battery pack can be normally charged and discharged after the temperature rises, but also timely detect the deformation of the battery pack box that is sufficient to affect the battery pack and issue an alarm when the battery pack is deformed due to external impact or extrusion. The environmental adaptability and safety of the power battery used in electric vehicles are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the connection of components of a battery pack device with box deformation monitoring and heating functions designed for the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the battery pack in the present invention;

[0025] Figure 3 It is a structural stereogram of the first monitoring board in the present invention;

[0026] Figure 4 It is a structural stereogram of the second monitoring board in the present invention;

[0027] Figure 5 is a three-dimensional diagram of the partition in the present invention;

[0028] Among them, 1 is an upper horizontal monitoring rod, 2 is a lower horizontal monitoring rod, 3 is a battery pack, 4 is a partition, 5 is a heating control module, 6 is a monitoring control module, 7 is a straight rod heating conductor, 8 is a first monitoring board, 9 is a second monitoring board, 10 is a horizontal rod heating conductor, 11 is an upper conductive strip, 12 is a lower conductive strip, 13 is a through hole, and 14 is a horizontal monitoring rod. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] like Figure 1 —5 shows a battery pack device with box deformation monitoring and heating functions, including a battery pack composed of a plurality of battery packs 3 connected in series, and a set of combined panels are fixedly attached to the side surface of each battery pack 3, which includes a first monitoring board 8, a second monitoring board 9 corresponding to the first monitoring board 8, and a porous partition 4. Each set of combined panels composed of the first monitoring board 8, the second monitoring board 9 and the partition 4 is fixedly attached to a certain side surface of a battery pack 3. The heating control module 5 is powered by a battery pack composed of a plurality of batteries including 3, and is connected to all heating conductors fixed on the first monitoring board 8. The monitoring control module 6 is connected to the monitoring rod on the first monitoring board 8 and the monitoring rod on the second monitoring board 9 of each battery pack 3. The monitoring rod on the first monitoring board 8, the monitoring rod on the second monitoring board 9 and the monitoring control module 6 can form a complete monitoring loop, in which the circuit is opened by the partition 4. Only when the partition 4 is damaged, the monitoring rod on the first monitoring board 8, the monitoring rod on the second monitoring board 9 and the monitoring control module 6 form a complete loop for the deformation alarm of the battery pack 3.

[0031] like Figure 2As shown, in a typical battery pack heating device that takes into account the deformation monitoring of the box, there is a first monitoring board 8 made of insulating heat-resistant phenolic plastic on the left side of the battery pack 3. A heating conductor is laid on the first monitoring board 8. The heating conductor includes a horizontal rod heating conductor 10 and a straight rod heating conductor 7. The two are connected to each other to form an S-shaped arrangement on the first monitoring board 8, which meets the heating arrangement requirements of the first monitoring board 8 to the greatest extent and has the largest heating range. Upper conductive strips 11 and lower conductive strips 12 made of copper foil are laid alternately in the gaps between the heating conductors. In order to further enhance the structural strength and sensitivity of the monitoring rods on the first monitoring board 8, the top of the upper conductive strip 11 is fixedly connected by an upper horizontal monitoring rod 1, and the bottom of the lower conductive strip 12 is fixedly connected by a lower horizontal monitoring rod 2. The upper conductive strip 11 is arranged vertically with the upper horizontal monitoring rod 1, and the lower conductive strip 12 is arranged vertically with the lower horizontal monitoring rod 2. At the position exactly corresponding to the above-mentioned first monitoring plate 8, there is a second monitoring plate 9 made of insulating heat-resistant material, on which a transverse monitoring rod 14 made of copper foil is laid. The transverse monitoring rod 14 is arranged perpendicular to the upper conductive strip 11 and the lower conductive strip 12. Such a structure can maximize the coverage of the arrangement range of the monitoring rods on the first monitoring plate 8 by the transverse monitoring rod 14. The side of the second monitoring plate 9 on which the transverse monitoring rod 14 is arranged is installed opposite to the side of the first monitoring plate 8 on which the upper conductive strip 11 and the lower conductive strip 12 are arranged. The first monitoring plate 8 and the second monitoring plate 9 are separated by a porous partition 4. The partition 4 can be made of ceramic material as raw material to form a porous plate. Preferably, the partition 4 is composed of closely arranged through holes in the shape of rectangles, regular hexagons, regular triangles, etc. Located on the first monitoring board 8, the monitoring rod on the first monitoring board 8 and the monitoring rod on the second monitoring board 9 are respectively connected to the first terminal and the second terminal of the monitoring signal input port of the monitoring control module 6. There is a DC or AC voltage difference of appropriate value between the first terminal and the second terminal for monitoring the circuit.

[0032] The heating conductor on the first monitoring board 8 is connected to the heating control module 5 which can control the on and off of the power supply. In the present embodiment, the power supply of the heating control module 5 comes from the battery group after the battery pack 3 is connected in series. When the battery pack 3 is used in a low temperature environment, the heating control module 5 turns on the power to the heating conductor on the first monitoring board 8 to generate heat and heat the battery pack 3 close to it. When the temperature of the lithium-ion battery rises to the expected required value, the heating is stopped. The heating conductor on the first monitoring board 8 is preferably made of a resistive conductor material with a positive temperature coefficient (PTC) property.

[0033] Embodiment 2:

[0034] Another battery pack device with box deformation monitoring and heating functions of the present invention has a generally similar structure to that of Embodiment 1, except that the arrangement position of the combined plate composed of the first monitoring plate 8, the partition plate 4 and the second monitoring plate 9 on the battery pack 3 is different. In this embodiment, the combined plate composed of the first monitoring plate 8, the partition plate 4 and the second monitoring plate 9 is arranged on the bottom surface, the right side surface, the top surface, the front end surface or the rear end surface of the battery pack 3.

[0035] Embodiment 3:

[0036] Another battery pack device with box deformation monitoring and heating functions of the present invention has an overall structure that is basically the same as that of Example 1, except that the arrangement position and quantity of the combined plate composed of the first monitoring plate 8, the partition plate 4 and the second monitoring plate 9 on the battery pack 3 are different. In this embodiment, the combined plate composed of the first monitoring plate 8, the partition plate 4 and the second monitoring plate 9 is arranged on the bottom surface, the right side surface, the top surface, the front end surface or the rear end surface of the battery pack 3, and one or more groups of combined plates are arranged on the bottom surface, the right side surface, the top surface, the front end surface or the rear end surface of the battery pack 3.

[0037] In the present invention, under normal conditions when the battery pack 3 is not impacted or squeezed, each pair of the first monitoring plate 8 and the second monitoring plate 9 in the battery pack 3 is separated by a porous partition 4 made of insulating brittle material, and there will be no electrical conduction between the first monitoring plate 8 and the second monitoring plate 9. Once a battery pack 3 is significantly deformed due to external forces such as impact and squeezing, the deformed box will squeeze the second monitoring plate 9, causing the partition 4 made of brittle insulating material between it and the first monitoring plate 8 to crack due to squeezing. Since the partition 4 is composed of a large number of through-hole structures arranged in a matrix, the partition 4 after cracking will not continue to cause continuous insulation isolation between the first monitoring plate 8 and the second monitoring plate 9. This pair of first monitoring plates 8 and the second monitoring plate 9 will stick together when the package body is significantly deformed. Electrical signals will be conducted between the monitoring rods after the bonding, and the monitoring control module 6 will issue an alarm after the monitoring circuit detects the conduction state.

[0038] In summary, the present invention controls the heating component through the heating control module 5, connects the monitoring component through the monitoring control module 6, and designs the monitoring component to be normally non-conductive, and the first monitoring component and the second monitoring component are conductive only after the battery pack 3 is impacted and deformed. The battery pack 3 can be heated when it is in a low temperature environment, so that the battery pack 3 can be charged and discharged normally after heating, and the deformation of the battery pack box sufficient to affect the battery group can be detected in time and an alarm can be issued when the battery pack 3 is deformed due to external impact or extrusion. The environmental adaptability and safety of the power battery used in electric vehicles are improved.

[0039] It should be noted here that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the present invention is only limited by the scope of the claims. Finally, it should be pointed out that the above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there may be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be deemed to belong to the protection scope of the present invention.

Claims

1. A battery pack device with box deformation monitoring and heating functions, comprising a battery pack composed of a plurality of battery packs (3) connected in series, characterized in that: At least one set of combined panels for monitoring whether the battery pack (3) is deformed is fixed on the surface of the battery pack (3), comprising a first monitoring component and a second monitoring component that can contact each other to form a passage, and the first monitoring component and the second monitoring component are separated from each other by a partition (4) that is damaged by collision; the first monitoring component and the second monitoring component are respectively connected to a first terminal and a second terminal of a monitoring signal input port of a monitoring control module (6); the combined panels comprise a first monitoring board (8) and a second monitoring board (9), the first monitoring board (8) being fixed to the surface of the battery pack (3), the first monitoring component being fixed on a side surface of the first monitoring board (8) facing away from the battery pack (3), the second monitoring component being fixed on a side surface of the second monitoring board (9) facing the first monitoring board (8), and the partition (4) being fixed between the first monitoring component and the second monitoring component; the first monitoring component is a conductive monitoring grid structure, comprising a plurality of conductive grids arranged at intervals along the length direction of the first monitoring board (8). The monitoring grid structure comprises an upper monitoring grid structure and a lower monitoring grid structure, and the conductive strips comprise an upper conductive strip (11) and a lower conductive strip (12); the upper monitoring grid structure comprises a plurality of the upper conductive strips (11) arranged at intervals along the length direction of the first monitoring board (8), and the lower monitoring grid structure comprises a plurality of the lower conductive strips (12) arranged at intervals along the length direction of the first monitoring board (8); the upper conductive strips (11) and the lower conductive strips (12) are arranged alternately at intervals along the length direction of the first monitoring board (8); a heating component is fixed between the gaps between two adjacent conductive strips, the battery pack is connected to a heating control module (5), the heating control module (5) is connected to the heating component, and the heating component is fixed on the first monitoring board (8); the heating component comprises a plurality of straight rod heating conductors (7) fixed between two adjacent upper conductive strips (11) and the lower conductive strips (12), and a cross rod heating conductor (10) connected between the tops or bottoms of two adjacent straight rod heating conductors (7).

2. The battery pack device with box deformation monitoring and heating functions as claimed in claim 1, characterized in that: The upper monitoring grid structure also includes an upper transverse monitoring rod (1) which is arranged along the length direction of the first monitoring plate (8) and is conductive, and the upper conductive strips (11) are vertically connected to the bottom of the upper transverse monitoring rod (1) at intervals along the length direction of the first monitoring plate (8).

3. The battery pack device with box deformation monitoring and heating functions as claimed in claim 1, characterized in that: The lower monitoring grid structure also includes a conductive lower transverse monitoring rod (2) arranged along the length direction of the first monitoring plate (8), and the lower conductive strip (12) is vertically connected to the top of the lower transverse monitoring rod (2) at intervals along the length direction of the first monitoring plate (8).

4. The battery pack device with box deformation monitoring and heating functions as claimed in claim 1, characterized in that: The partition (4) is a porous partition, which comprises through holes (13) arranged in a matrix.

5. The battery pack device with box deformation monitoring and heating functions as claimed in claim 1, characterized in that: The second monitoring assembly is a conductive transverse monitoring grid structure, which comprises a plurality of transverse monitoring rods (14) arranged at intervals along the width direction of the second monitoring plate (9).

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