CN214150553U

CN214150553U - Soft packet of lithium cell ultrasonic measurement device

Info

Publication number: CN214150553U
Application number: CN202120019463.8U
Authority: CN
Inventors: 刘波; 吁志强; 朱修锋
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2021-09-07
Anticipated expiration: 2031-01-05

Abstract

The utility model relates to a soft packet of lithium cell supersound measuring device, it can include container, lower container and at least a pair of ultrasonic transducer, go up the container with all hold the liquid medium who is used as the supersound couplant in the container down to two relative grip planes about having, the soft packet of lithium cell of treating is held between two grip planes, two ultrasonic transducer in a pair of ultrasonic transducer set up relatively respectively go up the container with in the container and submergence in liquid medium down, so that the ultrasonic wave can be followed one emission among two ultrasonic transducer sees through soft packet of lithium cell is received by another, thereby accomplishes right soft packet of lithium cell's ultrasonic testing. The utility model discloses simple structure, convenient operation can detect the inside degasification condition, pole piece defect and the electrolyte injection distribution of packet lithium cell at the line.

Description

Soft packet of lithium cell ultrasonic measurement device

Technical Field

The utility model relates to a power battery detects technical field, specifically relates to a soft packet of lithium cell ultrasonic measurement device.

Background

The soft package lithium battery is a common battery in the market of the current power battery, the appearance of the soft package lithium battery is square, and a plurality of layers of electrode materials, diaphragms and current collectors formed by winding or laminating are arranged inside the soft package lithium battery and are soaked by electrolyte. Compared with other batteries, the soft package lithium battery has the characteristics of high energy density, low cost and long service life.

At present, the means for evaluating the formation degassing process of the soft package lithium ion battery is very few, and usually, the battery cell is disassembled after formation to observe whether black spots exist on a negative electrode interface for evaluation. In addition, defects of pole pieces inside the lithium battery pack, electrolyte injection distribution and the like cannot be detected on line. Therefore, a device capable of detecting the degassing condition, the pole piece defect, the electrolyte injection distribution and the like in the soft package lithium battery on line is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can the inside degassing condition of soft packet of lithium cell of on-line measuring, pole piece defect and electrolyte annotate soft packet of lithium cell ultrasonic measurement device that liquid distributes etc..

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a soft packet of lithium cell supersound measuring device, it can include last container, lower container and at least a pair of ultrasonic transducer, the liquid medium that has the ultrasound couplant is held in last container and the lower container, and have two relative centre gripping planes from top to bottom, and the soft packet of lithium cell that awaits measuring is by the centre gripping between two centre gripping planes, two ultrasonic transducers in the pair of ultrasonic transducer respectively relative setting in last container and the lower container and submergence in the liquid medium to make ultrasonic wave can launch from one of the two ultrasonic transducers, see through the soft packet of lithium cell by another receipt, thereby accomplish the ultrasonic testing to the soft packet of lithium cell.

In a preferred embodiment, the lower container is stationary and the upper container is arranged to be movable up and down relative to the lower container.

In the preferred embodiment, the at least one pair of ultrasonic transducers is mounted on a support that can be moved back and forth and/or side to side.

In a preferred embodiment, the top of the upper container and the top of the lower container are respectively provided with a first opening and a second opening, the bracket comprises a mounting part respectively positioned in the upper container and the lower container and a connecting part extending from the first opening and the second opening, the at least one pair of ultrasonic transducers are fixedly mounted on the mounting part, and the connecting part is fixedly connected with a moving mechanism capable of moving back and forth and/or left and right.

In a preferred embodiment, the mounting portion comprises a plurality of mounting points distributed along the front-back direction, each mounting point is provided with one ultrasonic transducer, and the connecting portion is fixedly connected with a moving mechanism capable of moving left and right.

In a preferred embodiment, the mounting portion comprises a plurality of mounting points distributed along the left-right direction, each mounting point is provided with one ultrasonic transducer, and the connecting portion is fixedly connected with a moving mechanism capable of moving back and forth.

In a preferred embodiment, the first opening and the second opening are both rectangular openings, wherein the first opening is formed by the top of the upper container being open, and the second opening is located at the right side of the top of the lower container and higher than the top thereof, and the liquid level in the second opening is higher than the top of the lower container.

In a preferred embodiment, the size of the first opening and/or the second opening is consistent with the size of the soft package lithium battery to be detected.

In a preferred embodiment, a layer of highly elastic polymeric material, preferably silicone rubber, is adhered to the clamping plane.

In a preferred embodiment, the silicone rubber has a thickness of 5-10 mm.

The above technical scheme is adopted in the utility model, the beneficial effect who has is, the utility model discloses a device simple structure, convenient to use, low cost, design benefit, detection speed is fast, can the inside degasification condition of soft packet of lithium cell of on-line measuring, pole piece defect and electrolyte filling liquid distribution.

Drawings

Fig. 1 is the utility model discloses a soft packet of lithium cell ultrasonic measurement device's stereogram.

Fig. 2 is a cross-sectional view of the ultrasonic measuring device of the soft-package lithium battery shown in fig. 1.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the sake of clarity, the structure and operation of the present invention will be described with the aid of directional terms, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be understood as words of convenience and not as words of limitation.

Please refer to fig. 1 and 2, wherein fig. 1 is a perspective view of a soft-package lithium battery ultrasonic measuring device 1 according to an embodiment of the present invention, and fig. 2 is a cross-sectional view of the soft-package lithium battery ultrasonic measuring device 1. The utility model discloses soft packet of lithium cell 2 is the cuboid, can be applied to electric automobile field or similar industrial field.

As shown in fig. 1 and 2, an ultrasonic measuring device 1 for a soft-package lithium battery may include an upper container 11, a lower container 12, at least one pair of ultrasonic transducers 13, and the like. Both the upper container 11 and the lower container 12 contain a liquid medium 10 serving as an ultrasonic couplant. The liquid medium 10 is typically a silicone oil, which is capable of performing a good ultrasound coupling action. The upper vessel 11 is a rectangular vessel which is open, i.e. has a rectangular opening 111. The upper container 11 may be made of organic glass or acryl, etc. The size of which is related to the soft-packed lithium battery 2 to be tested. In one particular embodiment, the dimensions are 200mm by 150mm by 50 mm. The level (height) of the liquid medium 10 in the upper vessel 11 is 1/3 to 1/2 of the vessel height. The lower container 12 is a rectangular container having a rectangular opening 121 protruded upward at one side of the top and a rectangular body as a main body. The material is the same as that of the upper container 11. The level of the liquid medium 10 in the lower container 12 is above its top, i.e. in its rectangular opening 121. Thus, the top inner wall thereof comes into contact with the liquid medium 10. The upper container 11 and the lower container 12 have two

holding planes

112 and 122 opposite to each other up and down, and the lithium battery pack 2 to be tested is held between the two

holding planes

112 and 122. Two ultrasonic transducers of a pair of ultrasonic transducers 13 are oppositely arranged in the upper container 11 and the lower container 12 respectively and are immersed in the liquid medium 10. Therefore, ultrasonic waves can be emitted from one of the two ultrasonic transducers 13 (e.g., the ultrasonic transducer in the upper container 11), and sequentially received by the other (e.g., the ultrasonic transducer in the lower container 12) through the bottom of the upper container 11, the soft-packed lithium battery 2, and the top of the lower container 12, thereby implementing ultrasonic detection of the soft-packed lithium battery 2. Since ultrasonic testing is a non-destructive testing method, it can detect defects such as bubbles, cracks, etc. in the interior of an object. Therefore, this soft packet of lithium cell ultrasonic measurement device 1 can detect soft packet of lithium cell inside degassing condition, pole piece defect and electrolyte on line and annotate the liquid distribution.

It should be understood that the upper container 11 and the lower container 12 may have other shapes as long as they have two

clamping planes

112 and 122 facing up and down.

Preferably, lower container 12 is fixed, and upper container 11 arranges to move from top to bottom for lower container 12 for two containers can extrude soft packet of lithium cell 2, and with regard to soft packet of lithium cell 2 degasification, can characterize the inside gaseous how much of soft packet of electricity core through ultrasonic testing simultaneously, thereby the degassing effect of evaluation electricity core. And then the degassing process is adjusted according to the result of the ultrasonic detection, thereby improving the production quality.

For ease of operation, at least one pair of ultrasonic transducers 13 is mounted on a support 14 that can be moved back and forth and/or side to side. Here, the front-back direction refers to the width direction of the lithium battery pack 2, and the left-right direction refers to the longitudinal direction of the lithium battery pack 2. The carriage 14 may be moved manually or automatically by a corresponding motion mechanism. Through moving the support 14, can make ultrasonic transducer 13 remove along the horizontal plane (front and back and/or left and right sides direction) to carry out ultrasonic scanning to whole soft packet of lithium cell 2 and detect, it is very quick convenient.

Specifically, the stand 14 includes a mounting portion 141 located in the upper container 11 and the lower container 12, respectively, and a connecting portion 142 protruding from the

openings

111 and 112 of the upper container 11 and the lower container 12, respectively. At least one pair of ultrasonic transducers 13 is fixedly mounted (e.g., by adhesion, magnetic attraction, or embedding, etc.) on the mounting portion 141. The connecting portion 142 may be fixedly connected to a moving mechanism (not shown) that may move back and forth and/or side to side. The motion mechanism can be a pneumatic or electric two-dimensional linear motion module.

In the illustrated embodiment, the mounting portion 141 includes a plurality of mounting points (3 are shown) distributed in the left-right direction. That is, the mounting portion 141 includes three branches (three vertical bars in the upper container 11 and three L-shaped bars in the lower container 12). One of the ultrasonic transducers 13 is mounted on each of the mounting points. That is, 3 pairs of ultrasonic transducers 13 are respectively mounted on the lower ends of the three vertical rods in the upper container 11 and the upper ends of the vertical portions of the three L-shaped rods in the lower container 12. The connecting portion 142 (three gate-shaped portions connected together outside the upper container 11 and the lower container 12) is fixedly connected to a moving mechanism that can move forward and backward. The detection range of the three pairs of ultrasonic transducers 13 is equal to the length of the soft package lithium battery 2. Therefore, only the support 14 needs to be moved in the front-back direction (i.e. only the width of the soft package lithium battery 2 is scanned), so that the scanning time is greatly shortened, the detection efficiency is improved, and the program control is simplified.

It should be understood that a plurality of ultrasonic transducers 13 may be arranged in the width direction, so that the detection range is equal to the width of the lithium battery pack 2, and in this case, the support 14 only needs to be moved in the left-right direction (i.e., only scanning along the length of the lithium battery pack 2). That is, the mounting portion includes a plurality of mounting points distributed along the left-right direction, one ultrasonic transducer is mounted on each mounting point, and the connecting portion is fixedly connected with a moving mechanism capable of moving back and forth.

Of course, the bracket 14 is not limited to the illustrated embodiment, and for example, the mounting portion in the upper container 11 may be an inverted T-shape, and the mounting portion in the lower container 12 may be a T-shape.

Preferably, the size (length and width) of the opening 111 of the upper container 11 and/or the size (length and width) of the opening 121 of the lower container 12 is consistent with the size (length and width) of the soft package lithium battery 2 to be detected. This is advantageous for positioning and facilitates scan control.

In order to prevent the soft-packed lithium battery 2 from being damaged by the upper container 11 and the lower container 12, a layer of high elastic polymer material 15, preferably silicon rubber, is adhered to the clamping planes 111 and 121 (the bottom of the upper container 11 and the top of the lower container 12). Preferably, the silicone rubber has a thickness of 5-10 mm, which provides protection without attenuating the ultrasound waves too much. Likewise, the thickness of the bottom of the upper container 11 and the top of the lower container 12 also need to be controlled within a proper range (e.g., about 5 mm).

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications of the invention can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims

1. The ultrasonic measuring device for the soft package lithium battery is characterized by comprising an upper container, a lower container and at least one pair of ultrasonic transducers, wherein a liquid medium used as an ultrasonic coupling agent is contained in the upper container and the lower container, the upper container and the lower container are provided with two clamping planes which are opposite up and down, the soft package lithium battery to be detected is clamped between the two clamping planes, and two ultrasonic transducers in the pair of ultrasonic transducers are oppositely arranged in the upper container and the lower container respectively and immersed in the liquid medium, so that ultrasonic waves can be emitted from one of the two ultrasonic transducers and received by the other through the soft package lithium battery, and the ultrasonic detection of the soft package lithium battery is completed.

2. The flexible-package lithium battery ultrasonic measuring device of claim 1, wherein the lower container is stationary and the upper container is arranged to move up and down relative to the lower container.

3. The flexible-package lithium battery ultrasonic measuring device of claim 1, wherein the at least one pair of ultrasonic transducers are mounted on a support that can move back and forth and/or side to side.

4. The ultrasonic measuring device of the soft-package lithium battery as claimed in claim 3, wherein the top of the upper container and the top of the lower container are respectively provided with a first opening and a second opening, the bracket comprises a mounting part respectively positioned in the upper container and the lower container and a connecting part extending from the first opening and the second opening, the at least one pair of ultrasonic transducers are fixedly mounted on the mounting part, and the connecting part is fixedly connected with a moving mechanism capable of moving back and forth and/or left and right.

5. The ultrasonic measuring device for the soft-package lithium battery as claimed in claim 4, wherein the mounting part comprises a plurality of mounting points distributed along the front-back direction, each mounting point is provided with one ultrasonic transducer, and the connecting part is fixedly connected with a moving mechanism capable of moving left and right.

6. The ultrasonic measuring device for the soft-package lithium battery as claimed in claim 4, wherein the mounting part comprises a plurality of mounting points distributed along the left-right direction, each mounting point is provided with one ultrasonic transducer, and the connecting part is fixedly connected with a moving mechanism capable of moving back and forth.

7. The soft-packed lithium battery ultrasonic measuring device of any one of claims 4-6, wherein the first opening and the second opening are both rectangular openings, wherein the first opening is formed by the top of the upper container being open, and the second opening is located at the right side of the top of the lower container and above the top thereof, and the liquid level in the second opening is higher than the top of the lower container.

8. The ultrasonic measuring device for the soft-package lithium battery as claimed in claim 7, wherein the size of the first opening and/or the second opening is consistent with the size of the soft-package lithium battery to be detected.

9. The ultrasonic measuring device for the soft-package lithium battery as claimed in claim 1, wherein a layer of high-elasticity polymer material is adhered on the clamping plane.

10. The ultrasonic measuring device for the soft-package lithium battery as claimed in claim 9, wherein the high-elasticity polymer material is silicon rubber, and the thickness of the high-elasticity polymer material is 5-10 mm.