CN217384182U

CN217384182U - Battery pack monitoring device

Info

Publication number: CN217384182U
Application number: CN202220951896.1U
Authority: CN
Inventors: 谭志佳; 万龙; 彭青波; 李建强; 鲁鹏
Original assignee: BYD Co Ltd; Huizhou BYD Battery Co Ltd
Current assignee: BYD Co Ltd; Huizhou BYD Battery Co Ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-09-06
Anticipated expiration: 2032-04-22

Abstract

The utility model belongs to the technical field of battery safety monitoring, especially, relate to a battery package monitoring devices. The battery pack monitoring device comprises a sound wave monitoring mechanism arranged at the bottom of a battery pack, and the sound wave monitoring mechanism comprises a bottom guard plate and a signal acquisition assembly arranged on the bottom guard plate and used for acquiring a collision sound wave signal of the bottom guard plate; the signal acquisition assembly is positioned between the bottom protection plate and the battery pack. The utility model discloses a signal acquisition subassembly can gather the collision sound wave signal that the backplate was sent by the collision, and then can confirm the position that the collision takes place and the impaired degree of striking through this collision sound wave signal is accurate, the utility model discloses a battery package monitoring devices's sampling precision is high.

Description

Battery pack monitoring device

Technical Field

The utility model belongs to the technical field of battery safety monitoring, especially, relate to a battery package monitoring devices.

Background

At present, the safety state of the battery pack is usually detected by installing a force sensor at the bottom of the battery pack, that is, the force sensor is used for judging the impact force at the bottom of the battery pack, and then the damage degree of the battery pack is fed back. The disadvantages of the scheme are that: because the force sensor mainly detects the magnitude of a force signal by monitoring the deformation generated when the bottom of the battery pack is impacted, and the installation position of the force sensor is often not exactly positioned at the impacted position (but has a certain distance, so the monitored deformation is often smaller than the deformation of the impacted position), the deformation and the impact position point generated when the bottom of the battery pack is impacted can not be accurately monitored, the error of a sampling result is easy to be larger, and the sampling accuracy is poor; moreover, the scheme has a small sampling range.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to among the prior art battery package through the impaired degree at bottom force transducer detection battery package, its sampling accuracy subalternation problem provides a battery package monitoring devices.

In view of the above technical problem, an embodiment of the present invention provides a battery pack monitoring device, including a sound wave monitoring mechanism installed at the bottom of a battery pack, where the sound wave monitoring mechanism includes a bottom guard plate and a signal acquisition assembly installed on the bottom guard plate and used for acquiring a collision sound wave signal of the bottom guard plate; the signal acquisition assembly is positioned between the bottom protection plate and the battery pack.

Optionally, the acoustic wave monitoring mechanism further includes a protection plate disposed between the signal acquisition assembly and the battery pack.

Optionally, the thickness of the bottom protection plate and the thickness of the protection plate are both 0.6mm-2.0 mm.

Optionally, the signal acquisition assembly comprises a plurality of signal induction pieces for acquiring collision sound wave signals of the bottom guard plate, and the plurality of signal induction pieces are arranged on the bottom guard plate according to a preset arrangement rule.

Optionally, the signal sensing element includes a first plate having a first lead, a second plate disposed opposite to the first plate and having a second lead, and a package layer covering the first plate and the second plate, the second plate is located between the first plate and the bottom protective plate, and the first plate and the second plate enclose a filling space for filling insulating particles.

Optionally, the signal sensing element further includes an enhancement plate disposed in the filling space, the enhancement plate is located between the first polar plate and the second polar plate, and the enhancement plate is disposed in parallel with the first polar plate and the second polar plate at an interval.

Optionally, the signal acquisition assembly further comprises a mounting plate arranged between the bottom of the battery pack and the bottom guard plate, and the signal sensing element is mounted on the bottom guard plate through the mounting plate.

Optionally, a plurality of mounting holes are formed in the mounting plate, and the plurality of signal sensing pieces are mounted in the mounting holes in a one-to-one correspondence manner.

Optionally, the bottom guard plate and the mounting plate are connected in a hot press forming mode.

Optionally, the connection mode of the sound wave monitoring mechanism and the battery pack is screw connection or rivet connection.

The utility model discloses a battery pack monitoring device, including installing the sound wave monitoring mechanism in the battery pack bottom, the sound wave monitoring mechanism includes the end backplate and installs on the backplate and be used for gathering the signal acquisition subassembly of the collision sound wave signal of backplate; the signal acquisition assembly is positioned between the bottom protection plate and the battery pack. In the utility model, the bottom guard plate arranged at the bottom of the battery pack generates collision sound wave signals after being collided, and the signal acquisition assembly can acquire the collision sound wave signals sent by the collision of the bottom guard plate, so that the position of the collision and the collision damage degree can be accurately determined through the collision sound wave signals; because the transmission loss of collision sound wave signal backplate is less at the end (compare among the prior art through the scheme of the deformation of backplate at the end of force sensor monitoring), consequently, the utility model discloses a battery package monitoring devices's sampling precision is high.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of a battery pack monitoring device according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a sound wave monitoring mechanism of a battery pack monitoring device according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a signal sensing element of a battery pack monitoring device according to an embodiment of the present invention.

Fig. 4 is a schematic view showing the arrangement of the signal sensing parts on the mounting plate of the battery pack monitoring apparatus shown in fig. 3.

The reference numerals in the specification are as follows:

1. a battery pack; 2. a sound wave monitoring mechanism; 21. a bottom guard plate; 22. a signal acquisition component; 221. a signal sensing member; 2211. a first lead; 2212. a first electrode plate; 2213. a second lead; 2214. a second polar plate; 2215. a packaging layer; 2216. insulating particles; 2217. filling the space; 2218. a reinforcing plate; 222. mounting a plate; 2221. mounting holes; 23. and (5) protecting the board.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

It is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "middle", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a battery pack monitoring device, which includes a sound wave monitoring mechanism 2 installed at the bottom of a battery pack 1, where the sound wave monitoring mechanism 2 includes a bottom guard plate 21 and a signal collecting assembly 22 installed on the bottom guard plate 21 and used for collecting a collision sound wave signal of the bottom guard plate 21; the signal acquisition assembly 22 is located between the bottom protection plate 21 and the battery pack 1. Further, the connection manner of the acoustic wave monitoring mechanism 2 and the battery pack 1 includes, but is not limited to, a screw connection or a rivet connection. In this embodiment, the acoustic wave monitoring mechanism 2 is installed at the bottom of the battery pack 1, wherein the bottom guard plate 21 is located at the lowest part of the whole acoustic wave monitoring mechanism 2, and the signal acquisition assembly 22 is located between the bottom guard plate 21 and the battery pack 1, that is, the signal acquisition assembly 22 is installed above the bottom guard plate 21, so that when the bottom of the battery pack 1 collides, the bottom guard plate 21 is firstly impacted, at this time, the collision acoustic wave signal generated by the collision of the bottom guard plate 21 is acquired by the signal acquisition assembly 22, and then the position and the collision damage degree of the collision can be accurately determined according to the collision acoustic wave signal, and the collision warning or the danger degree of the current collision can be judged and warned and the driver can be reminded to perform related processing.

Understandably, the signal collecting assembly 22 can be integrated in the bottom guard plate 21, for example, embedded in the bottom guard plate 21 and prepared and molded together, and the structure thereof will be simpler; or, the signal acquisition assembly 22 may also be installed on the bottom protection plate 21 through other installation structures (such as the installation plate 222 mentioned later), and when the bottom protection plate 21 is scrapped, the other installation structures may be removed, so as to recycle the signal acquisition assembly 22, thereby saving the cost and improving the utilization rate.

In the utility model, the bottom guard plate 21 installed at the bottom of the battery pack 1 generates a collision sound wave signal after being collided, and the signal acquisition assembly 22 can acquire the collision sound wave signal sent by the collision of the bottom guard plate 21, so that the position of collision and the collision damage degree can be accurately determined through the collision sound wave signal; because the transmission loss of collision sound wave signal at backplate 21 is less (compare among the prior art through the scheme of the deformation of backplate 21 at the bottom of force sensor monitoring), consequently, the utility model discloses a battery package monitoring devices's sampling precision is high.

In one embodiment, as shown in fig. 2, the acoustic wave monitoring mechanism 2 further comprises a protective plate 23 disposed between the signal acquisition assembly 22 and the battery pack 1. Further, the thicknesses of the bottom protection plate 21 and the protection plate 23 can be set according to requirements, and specifically, the thicknesses of the bottom protection plate 21 and the protection plate 23 are both 0.6mm-2.0 mm; for example, the thickness of the bottom protection plate 21 and the thickness of the protection plate 23 are both 1.5 mm. That is, in this embodiment, the acoustic wave monitoring mechanism 2 protects the signal acquisition assembly 22 between the bottom protection plate 21 and the protection plate 23, wherein the bottom protection plate 21 and the protection plate 23 can be set according to the requirement, for example, both can be made of PP (polypropylene) glass fiber material, at this time, the bottom protection plate 21 and the protection plate 23 can be hot-pressed, and then the signal acquisition assembly 22 is stably fixed between the two.

In an embodiment, as shown in fig. 1, 2 and 4, the signal collecting assembly 22 includes a plurality of signal sensing members 221 for collecting the impact sound wave signal of the bottom cover plate 21, and the plurality of signal sensing members 221 are arranged on the bottom cover plate 21 according to a predetermined arrangement rule. The preset arrangement rule can be set as required, so long as a plurality of signal sensors 221 can accurately measure the impact sound wave signals generated when any position on the bottom protection plate 21 is impacted, that is, the impact sound wave signals at the bottom of the battery pack 1 can be comprehensively measured. As shown in fig. 4, 6 × 7 (42 total) sampling points are uniformly distributed in fig. 4, each sampling point is provided with one signal inductor, then the 42 signal inductors respectively installed at the 42 sampling points are respectively connected in parallel in the transverse direction and the longitudinal direction, and further, the bottom of the battery panel is divided into 6 × 7 regions (i.e., regions formed after arrangement according to the preset arrangement rule), so that when the battery panel collides with a certain region on the bottom guard plate 21, the region to which the collision position point belongs can be determined according to different collision sound wave signals measured by the signal inductors in the transverse direction and the longitudinal direction, and then the distance from the collision position point to the sampling point and the degree of harm of the current collision are determined by the controller according to the size of the collision sound wave signals; furthermore, analysis can be performed according to the energy of the collision sound wave signals of other areas (such as adjacent areas) of the area to which the collision position point belongs, so that the determination of the collision position point and the judgment of the damage degree are more accurate.

Understandably, the signal collecting assembly 22 may adopt a capacitive or inductive signal sensor 221 to collect the collision sound wave signal, so that when the bottom of the bottom guard plate 21 collides, the collision sound wave is collected by the signal sensor 221 to cause a change in capacitance or inductance, which results in a change in an electrical signal transmitted to a controller (the controller may be a battery management system connected to the battery pack 1 and used for managing the battery pack 1, or may be another control module) connected to the signal sensor 221, and the collision energy and the specific position where the collision occurs may be determined according to changes in electrical signals of all the signal sensors 221 arranged according to a preset arrangement rule.

Further, as shown in fig. 3, the signal sensing part 221 includes a first plate 2212 having a first lead 2211, a second plate 2214 disposed opposite to the first plate 2212 and having a second lead 2213, and a packaging layer 2215 covering the first plate 2212 and the second plate 2214, wherein the second plate 2214 is disposed between the first plate 2212 and the bottom cover 21, and the first plate 2212 and the second plate 2214 define a filling space 2217 for filling with insulating particles 2216. Further, the insulating particles 2216 are made of insulating materials with a hardness of shore a60-80, such as silica gel particles, and the filling of the filling space 2217 with the insulating particles 2216 can prevent interference caused by small energy and other non-collision sounds. The encapsulation layer 2215 refers to a protection and fixing layer formed by encapsulating the first and

second electrode plates

2212 and 2214 on the outer surface thereof by epoxy or ceramic material. In this embodiment, the first plate 2212 and the second plate 2214 form a capacitive interface, and the first lead 2211 and the second lead 2213 are used for transmitting the generated signals, wherein the signal sensor can realize parallel connection between sampling points and connection with the controller through the first lead 2211 and the second lead 2213. In this embodiment, as shown in fig. 3, when the bottom of the bottom guard plate 21 collides, the first plate 2212 vibrates due to the energy transmitted by the sound, and the larger the energy of the vibration, the larger the distance difference between the first plate 2212 and the second plate 2214, and at this time, the capacitance value changes with the change of the distance between the first plate 2212 and the second plate 2214, and further, the voltage applied to the two ends of the first plate 2212 and the second plate 2214 changes, and at this time, the magnitude of the collision energy at the bottom of the bottom guard plate 21 can be determined according to the variation value and the duration time of the voltage.

Further, as shown in fig. 3, the signal sensing part 221 further includes a reinforcing plate 2218 disposed in the filling space 2217, the reinforcing plate 2218 is disposed between the first plate 2212 and the second plate 2214, and the reinforcing plate 2218 is disposed in parallel with and spaced apart from the first plate 2212 and the second plate 2214. The arrangement of the reinforcing plate 2218 can be used for increasing capacitance value of the capacitor, and monitoring precision is improved.

In one embodiment, as shown in fig. 2, the signal collecting assembly 22 further includes a mounting plate 222 disposed between the bottom of the battery pack 1 and the bottom protective plate 21, and the signal sensor 221 is mounted on the bottom protective plate 21 through the mounting plate 222. Further, the bottom guard plate 21 and the mounting plate 222 are connected by hot press molding. In one embodiment, the mounting plate 222 is disposed between the guard plate 23 and the bottom guard plate 21; that is, in this embodiment, the signal sensing member 221 is first installed on the installation plate 222 to rigidly support the signal sensing member 221, so as to improve the overall performance of the signal acquisition assembly 22; after the signal sensing member 221 is mounted on the mounting plate 222, the mounting plate 222 of the acoustic wave monitoring mechanism 2 is disposed between the bottom protection plate 21 and the protection plate 23, so as to stably fix and protect the mounting plate 222 and the mounted signal sensing member 221. Wherein, the material of mounting panel 222 can be set for according to the demand, for example, mounting panel 222 can be made by materials such as PP honeycomb class, and at this moment, if end backplate 21 and protection shield 23 are made by the fine material of PP glass, then mounting panel 222, end backplate 21 and protection shield 23 three between can hot briquetting. Further, the mounting plate 222 is provided with a plurality of mounting holes 2221, and the plurality of signal sensing members 221 are mounted in the mounting holes 2221 in a one-to-one correspondence manner. In this embodiment, the signal sensing part 221 may be inserted into the mounting hole 2221 of the mounting plate 222 according to the size of the battery pack 1, at which time the first lead 2211 and the second lead 2213 of the signal sensing part 221 will be led out, and then the potting is filled with glue to fix the signal sensing part 221 in the mounting hole 2221.

The above description is only an example of the battery pack monitoring device of the present invention, and should not be construed as limiting the present invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack monitoring device is characterized by comprising a sound wave monitoring mechanism arranged at the bottom of a battery pack, wherein the sound wave monitoring mechanism comprises a bottom guard plate and a signal acquisition assembly arranged on the bottom guard plate and used for acquiring collision sound wave signals of the bottom guard plate; the signal acquisition assembly is positioned between the bottom protection plate and the battery pack.

2. The battery pack monitoring device of claim 1, wherein the acoustic wave monitoring mechanism further comprises a protective plate disposed between the signal acquisition assembly and the battery pack.

3. The battery pack monitoring apparatus of claim 2, wherein the thickness of each of the backplate and the protective plate is 0.6mm to 2.0 mm.

4. The battery pack monitoring device according to any one of claims 1 to 3, wherein the signal acquisition assembly comprises a plurality of signal sensing members for acquiring the impact sound wave signal of the bottom protection plate, and the signal sensing members are arranged on the bottom protection plate according to a preset arrangement rule.

5. The battery pack monitoring device according to claim 4, wherein the signal sensor comprises a first plate having a first lead, a second plate disposed opposite to the first plate and having a second lead, and an encapsulation layer covering the first plate and the second plate, the second plate is located between the first plate and the bottom protective plate, and the first plate and the second plate enclose a filling space for filling insulating particles.

6. The battery pack monitoring device of claim 5, wherein the signal sensor further comprises a reinforcing plate disposed in the filling space, the reinforcing plate is disposed between the first pole plate and the second pole plate, and the reinforcing plate is spaced apart from and parallel to the first pole plate and the second pole plate.

7. The battery pack monitoring device of claim 4, wherein the signal acquisition assembly further comprises a mounting plate disposed between the bottom of the battery pack and the backplate, the signal sensor being mounted on the backplate via the mounting plate.

8. The battery pack monitoring device of claim 7, wherein the mounting plate is provided with a plurality of mounting holes, and a plurality of the signal sensing elements are mounted in the mounting holes in a one-to-one correspondence.

9. The battery pack monitoring device of claim 7, wherein the bottom guard plate is attached to the mounting plate by hot press molding.

10. The battery pack monitoring device of claim 1, wherein the acoustic wave monitoring mechanism is attached to the battery pack by a screw or rivet connection.