CN216145671U

CN216145671U - Battery package bulge detection device

Info

Publication number: CN216145671U
Application number: CN202121817710.5U
Authority: CN
Inventors: 陈卫宇; 周英猛; 王世腾
Original assignee: TECHRAD (ZHEJIANG) AUTOMOTIVE THERMAL SYSTEMS CORP
Current assignee: TECHRAD (ZHEJIANG) AUTOMOTIVE THERMAL SYSTEMS CORP
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2022-03-29
Anticipated expiration: 2031-08-05

Abstract

The utility model relates to a battery pack bulge detection device which not only can early warn the deformation of an automobile battery pack, but also can effectively monitor various deformations and has good monitoring effect. The advantages are that: the utility model provides a battery package swell detection device not only can carry out early warning in advance to the deformation of car battery package, can effectively monitor multiple deformation moreover, and is with monitoring effect good.

Description

Battery package bulge detection device

Technical Field

The utility model relates to a battery pack bulge detection device which not only can early warn the deformation of an automobile battery pack in advance, but also can effectively monitor various deformations and has a good monitoring effect, and belongs to the technical field of new energy automobile manufacturing.

Background

Along with the popularization and rapid development of new energy electric vehicles and other energy storage devices, the application of power battery packs is becoming more and more extensive, the power battery packs are generally formed by combining a plurality of single batteries and are provided with square shells, cylinders, soft packs and the like, when one single battery in the power battery packs swells, risks such as fire and the like can occur, and spontaneous combustion or other events caused by swelling of the battery packs always occur in the actual application scene at present, so that the life safety and the property safety are seriously threatened.

A conventional device for detecting a battery pack bulge, such as CN 209071553U, entitled "a battery pack bulge detecting device", includes a plurality of modules, and the battery pack bulge detecting device includes: the battery pack comprises a plurality of modules, a plurality of pressure detection modules and a battery pack, wherein one pressure detection module is correspondingly arranged between every two adjacent modules in the plurality of modules, one adjacent module is arranged on one side of the module, the other side of the module is close to a shell of the battery pack, and one pressure detection module is also arranged on one side close to the shell and is used for detecting the pressure between the two corresponding adjacent modules or the pressure of the module relative to the shell; the main control module is used for acquiring the pressure detected by the pressure detection module and judging that the battery pack bulges when the pressure detected by any pressure detection module is greater than a first set threshold value. The main control module is further used for judging that the battery pack has serious faults when the pressure detected by any one of the pressure detection modules is greater than a second set threshold value. The battery pack bulge detection device further comprises an alarm module which is connected with the main control module and used for giving an alarm when the battery pack bulges or has serious faults. The battery pack bulge detection device also comprises a display module which is connected with the pressure detection module and used for displaying the pressure detected by the pressure detection module; and/or the main control module is connected with the battery pack and used for displaying the judgment result of the battery pack bulging by the main control module. The battery pack bulge detection device further comprises a plurality of module control modules, the number of the module control modules is the same as that of the modules, one module control module is correspondingly arranged on each module, and each module control module is configured to collect pressure detected by the pressure detection modules arranged on two sides of the corresponding module. The module control module is a slave control panel CMC in the corresponding module. The main control module is further used for determining the position of the battery pack where the bulge occurs according to the position corresponding relation between the pressure detection module and the module control module, wherein the detected pressure is larger than a first set threshold value. A battery management system of a vehicle, the battery pack bulge detection device. Integrating the master control module into a battery management unit (BCU) of the battery management system, and the master control module is further configured to: when the battery pack swells, controlling to reduce the input or output power of the battery pack; and/or controlling the battery pack to perform power-off operation when the battery pack has a serious fault. A vehicle is provided with the battery management system. The detection device has the disadvantage that early warning cannot be performed.

SUMMERY OF THE UTILITY MODEL

The design purpose is as follows: for avoiding not enough among the background art, design one kind not only can carry out early warning in advance to the deformation of car battery package, can effectively monitor multiple deformation moreover, with a monitoring effect good battery package swell detection device.

The design scheme is as follows: the design purpose is realized.

1. The automobile battery pack is characterized in that at least one resistance strain gauge is arranged on each surface of the automobile battery pack and connected into a bridge circuit, each resistance strain gauge becomes a bridge arm in the bridge circuit, and an output voltage signal generated in the bridge circuit can be uploaded to a controller in real time. The purpose of this design is: firstly, each surface of an automobile battery pack is at least provided with a resistance strain gauge, each surface of a shell of the automobile battery pack is pasted with a layer of resistance strain gauge to feed back the bulging phenomenon of the battery pack, the resistance strain gauge can change resistance through mechanical deformation of the structure of the battery pack, and the deformation condition of the automobile battery pack is monitored by recording the change of the resistance, so that early warning can be realized; and secondly, the resistance strain gauges are connected into the bridge circuit, each resistance strain gauge becomes a bridge arm in the bridge circuit, and thus the device can effectively monitor the instantaneous deformation of the battery pack, the continuous accumulated deformation of the battery pack to a set value and the continuous deformation of the battery pack for a long time.

2. The number of the bridge circuits is matched with the number of the resistance strain gauges, and the design that the resistance strain gauges are connected into the corresponding bridge circuits is the second technical characteristic of the utility model. The purpose of this design is: the number of the bridge circuits is matched with that of the resistance strain gauges, and the resistance strain gauges are connected into the corresponding bridge circuits, so that the detection device can effectively monitor all surfaces and can judge which surface(s) of the battery pack is/are bulged.

3. When the resistance strain gauges are divided by four integers and have remainders, each four resistance strain gauges are connected into the same bridge circuit to serve as four bridge arms of the bridge circuit; the remaining resistance strain gauges are connected into a bridge circuit independently to form a design of a bridge arm in the corresponding bridge circuit, and the design is the third technical characteristic of the utility model. The purpose of this design is: when the resistance strain gauges are divided by four integers and have remainders, each four resistance strain gauges are connected into the same bridge circuit to serve as four bridge arms of the bridge circuit; the remaining residual resistance strain gauges are connected into one bridge circuit independently to form one bridge arm in the corresponding bridge circuit, so that the number of the bridge circuits can be reduced, and the production cost of the detection device is reduced.

4. The resistance strain gauge is characterized by comprising a base plate, a sensitive grid and a protective layer, wherein the sensitive grid is arranged on the upper end face of the base plate, the protective layer is arranged on the upper end face of the sensitive grid, and an adhesive layer is arranged on the lower end face of the base plate. The purpose of this design is: firstly, the arrangement of the sticking layer enables the resistance strain gauge to be quickly stuck on the shell of the automobile battery pack; and secondly, the substrate and the protective layer play a role in protecting the sensitive grid, so that the resistance strain gauge can be used for monitoring the automobile battery pack for a long time and stably.

The technical scheme is as follows: a battery pack bulge detection device comprises an automobile battery pack and a controller, wherein at least one resistance strain gauge is arranged on each surface of the automobile battery pack and connected into a bridge circuit, each resistance strain gauge becomes a bridge arm in the bridge circuit, and an output voltage signal generated in the bridge circuit can be uploaded to the controller in real time.

Compared with the prior art, the battery pack bulge detection device not only can early warn the deformation of the automobile battery pack in advance, but also can effectively monitor various deformations, and has good monitoring effect.

Drawings

Fig. 1 is a schematic structural diagram of an automobile battery pack in a battery pack bulge detection device after the automobile battery pack is combined with a resistance strain gauge.

FIG. 2 is a schematic diagram of a resistive strain gage access bridge circuit.

Fig. 3 is a schematic cross-sectional structure of a resistance strain gauge.

Fig. 4 is a schematic diagram of a resistance strain gauge access bridge circuit (four bridge arms are formed by accessing a resistance strain gauge).

Detailed Description

Example 1: reference is made to figures 1-3 of the drawings. A battery pack bulge detection device comprises an automobile battery pack 1 and a controller, wherein each surface of the automobile battery pack 1 is at least provided with a resistance strain gauge 2, the resistance strain gauges 2 are connected into a bridge circuit, each resistance strain gauge 2 becomes a bridge arm in the bridge circuit, and an output voltage signal generated in the bridge circuit can be uploaded to the controller in real time; the controller can process the uploaded output voltage signal and can judge whether the surface of the shell of the automobile battery pack 1 bulges. Each surface of the shell of the automobile battery pack 1 is pasted with a layer of resistance strain gauge 2 to feed back the bulging phenomenon of the battery pack, the resistance strain gauge 2 can change resistance through mechanical deformation of the battery pack structure, and the deformation condition of the automobile battery pack 1 is monitored through recording the change of the resistance, so that early warning can be achieved. The deformation condition of the following battery pack can be pre-warned: firstly, the instantaneous deformation is overlarge; secondly, continuously accumulating and deforming to a set value; and thirdly, the continuous deformation with longer duration.

The number of the bridge circuits is matched with that of the resistance strain gauges 2, and the resistance strain gauges 2 are connected into the corresponding bridge circuits; i.e. each resistive strain gauge 2 is individually connected into this bridge circuit. The resistance strain gauge 2 comprises a base disc 21, a sensitive grid 22 and a protective layer 23, wherein the sensitive grid 22 is arranged on the upper end face of the base disc 21, the protective layer 23 is arranged on the upper end face of the sensitive grid 22, and an adhesive layer 24 is arranged on the lower end face of the base disc 21. The substrate 21 is made of a plastic film, the protective layer 23 is a laminated film, and the sensitive grid 22 is a metal resistor sheet.

Example 2: reference is made to fig. 4 on the basis of example 1. Four bridge arms in the bridge circuit are formed by connecting a resistance strain gauge 2; particularly, four resistance strain gauges 2 on the same surface can be connected into the same bridge circuit to form four bridge arms of the bridge circuit.

Example 3: on the basis of example 1 or 2. When the resistance strain gauges 2 are divided by four integers to have remainders, every four resistance strain gauges 2 are connected into the same bridge circuit to be used as four bridge arms of the bridge circuit; and the rest of resistance strain gauges 2 are connected into a bridge circuit individually to form a bridge arm in the corresponding bridge circuit.

It is to be understood that: although the above embodiments have described the design idea of the present invention in more detail, these descriptions are only simple descriptions of the design idea of the present invention, and are not limitations of the design idea of the present invention, and any combination, addition, or modification without departing from the design idea of the present invention falls within the scope of the present invention.

Claims

1. The utility model provides a battery package swell detection device, includes car battery package (1) and controller, characterized by: each surface of the automobile battery pack (1) is at least provided with one resistance strain gauge (2), the resistance strain gauges (2) are connected into a bridge circuit, each resistance strain gauge (2) becomes a bridge arm in the bridge circuit, and output voltage signals generated in the bridge circuit can be uploaded to a controller in real time.

2. The battery pack bulge detection device according to claim 1, wherein: the number of the bridge circuits is matched with the number of the resistance strain gauges (2), and the resistance strain gauges (2) are connected into the corresponding bridge circuits.

3. The battery pack bulge detection device according to claim 1, wherein: four bridge arms in the bridge circuit are formed by connecting a resistance strain gauge (2).

4. The battery pack bulge detection device according to claim 1, wherein: when the resistance strain gauges (2) are divided by four integers to have remainders, every four resistance strain gauges (2) are connected into the same bridge circuit to be used as four bridge arms of the bridge circuit; and the rest of resistance strain gauges (2) are connected into one bridge circuit individually to form one bridge arm in the corresponding bridge circuit.

5. The battery pack bulge detection device according to claim 1, wherein: resistance foil gage (2) are including base plate (21), sensitive bars (22) and protective layer (23), the up end of base plate (21) is equipped with sensitive bars (22) and the up end of sensitive bars (22) is equipped with protective layer (23), the lower terminal surface of base plate (21) is equipped with pastes layer (24).

6. The battery pack bulge detection device according to claim 5, wherein: the base disc (21) is made of a plastic film, the protective layer (23) is a laminated film, and the sensitive grid (22) is a metal resistance sheet.