CN218414708U

CN218414708U - Battery formation clamp and formation equipment

Info

Publication number: CN218414708U
Application number: CN202222245965.XU
Authority: CN
Inventors: 卢艳生; 谢安河; 赵云龙
Original assignee: Huizhou Liwinon Energy Technology Co Ltd
Current assignee: Huizhou Liwinon Energy Technology Co Ltd
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2023-01-31
Anticipated expiration: 2032-08-25

Abstract

The utility model belongs to the technical field of batteries, in particular to a battery formation clamp and a battery formation device, wherein the battery formation clamp comprises an upper pressing plate and a lower pressing plate, the lower pressing plate and the upper pressing plate are correspondingly arranged, and an accommodating cavity for placing a battery is formed between the upper pressing plate and the lower pressing plate; the upper pressing plate and/or the lower pressing plate are/is provided with a distance sensor, and the distance sensor is used for detecting the distance between the upper pressing plate and the lower pressing plate. Through top board and/or bottom board installation distance sensor for the distance between real time monitoring top board and the bottom board, battery thickness this moment promptly, because of the formation initial stage of charging, electric core is in quick inflation, for guaranteeing battery liquid retention ability, the pressure that the top board was applyed at this moment is F, when laser range finder control battery thickness inflation to appointed thickness T, promote formation pressure to F, make battery thickness keep near regulation thickness, and then guarantee that the liquid retention volume and the battery energy density of battery are not influenced, can also improve the interface reaction of battery.

Description

Battery formation clamp and formation equipment

Technical Field

The utility model belongs to the technical field of the battery, concretely relates to battery ization becomes anchor clamps and becomes equipment.

Background

The lithium ion battery has the advantages of high voltage, high energy density, small environmental pollution and the like, and is widely applied to small electronic products. Along with the development of products, in order to prolong the service time of an electric appliance, the energy density of the battery is continuously improved, the compaction density of a pole piece corresponding to the battery is increased, and the improvement of the compaction density can directly deteriorate the infiltration effect of the battery; in the lithium ion battery with normal functions, the infiltration effect of the electrolyte in the pole piece directly determines the performance of the battery, and normal electrochemical reaction can be carried out only if the active material in the pole piece is fully infiltrated by the electrolyte.

Referring to fig. 6, in the positive and negative electrode sheets, the positive active material (generally, lithium cobaltate, ternary material, etc.) is not easy to deform, has low tortuosity and low corresponding infiltration resistance, and for the graphite negative electrode, since the graphite particles undergo plastic deformation during compression, expansion occurs in the plane of the electrode sheet and the electrode sheet is compressed in the direction perpendicular to the electrode sheet, the infiltration resistance of the electrolyte from the surface of the electrode sheet to the bottom is high, and the greater the compaction density is, the higher the infiltration difficulty of the electrolyte is.

The formation process in the lithium ion battery manufacturing is also a key process in the lithium ion battery manufacturing, and specifically, after the battery is injected with liquid and soaked, the temperature and the pressure of the battery are increased by using a hot clamp, and the activation is completed after the charging. The purpose of temperature and pressure is to improve the battery dynamics and activate the diaphragm to bond and finish the shaping. The pressure is increased to reduce the distance between the positive interface and the negative interface, so that the bonding is better, the thickness of the battery can be reduced while the interface reaction is improved, and the energy density is improved. Similarly, the increase of the formation pressure causes the electrolyte in the battery to be squeezed out, so that the liquid retention is reduced, and the battery performance is affected.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model lies in: aiming at the defects of the prior art, a battery formation clamp is provided to solve the technical problems existing in the technical background.

In order to realize the purpose, the utility model adopts the following technical scheme: a battery formation clamp is used for clamping a battery and comprises an upper pressing plate and a lower pressing plate, wherein the lower pressing plate and the upper pressing plate are correspondingly arranged, and an accommodating cavity for accommodating the battery is formed between the upper pressing plate and the lower pressing plate; the upper pressing plate and/or the lower pressing plate are/is provided with a distance sensor, and the distance sensor is used for detecting the distance between the upper pressing plate and the lower pressing plate.

Furthermore, the pressing device also comprises a plurality of stopping pieces, one ends of the stopping pieces are fixedly connected with the lower pressing plate and/or the upper pressing plate, and the stopping pieces are positioned in the accommodating cavities.

Further, the plurality of stoppers are equal in height.

Further, the height of the stopper is h, and the distance between the upper pressing plate and the lower pressing plate is d, wherein h and d satisfy the relation: h is less than or equal to d.

Further, the stopper has a height smaller than the thickness of the battery.

Further, the distance sensor is one of an ultrasonic distance measuring sensor, a laser distance measuring instrument or an infrared distance measuring sensor.

Further, the upper platen and the lower platen are the same in size and shape.

Further, the testing precision of the distance sensor is smaller than or equal to 1um.

Further, the stopper is provided with 3, and 3 stoppers are in the same line, and the interval between 3 stoppers is equal.

The utility model discloses a second of purpose lies in: a formation device is provided, and comprises the battery formation clamp.

The beneficial effects of the utility model reside in that:

(1) The utility model provides a pair of battery ization becomes anchor clamps, through top board and/or lower clamp plate installation distance sensor, a distance for real time monitoring top board and lower clamp plate between, battery thickness this moment promptly, because of the formation initial stage of charging, electric core is in the rapid expansion, for guaranteeing battery liquid retention ability, the pressure that the top board was applyed at this moment is F, when laser range finder monitors battery thickness inflation to appointed thickness T, promote to become pressure to F, make battery thickness keep near regulation thickness, make the liquid retention volume and the battery energy density of battery not influenced, can also improve the interface reaction of battery.

(2) The stop piece is arranged between the upper pressing plate and the lower pressing plate, so that the thickness of the battery can be closer to the target thickness, the thickness difference of each group of batteries is kept within a certain range, and the thickness consistency of the battery is improved.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a battery formation jig according to an embodiment of the present invention;

FIG. 2 is a graph of compaction density versus formation pressure made from Table 1-1;

FIG. 3 is a 3D plot of cell thickness versus formation pressure combination;

FIG. 4 is a 3D diagram of battery liquid retention corresponding to the combination of battery thickness and formation pressure;

FIG. 5 is a graph of battery formation SOC versus thickness;

FIG. 6 is a cold pressing effect diagram of positive and negative electrode plates.

Wherein the reference numerals are as follows:

1. an upper pressure plate; 2. a lower pressing plate; 3. an accommodating cavity; 4. a distance sensor; 5. a stopper; 6. a battery.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The description and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, that a person skilled in the art can solve the technical problem within a certain error range, and that a technical effect is substantially achieved.

In the description of the application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but 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 invention.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the terms "connected," "secured," and the like are to be construed broadly and encompass, for example, a fixed connection, a removable connection, an integral connection, or an electrical connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

The present invention will be described in further detail with reference to fig. 1 to 6, but the present invention is not limited thereto.

The embodiment of the utility model provides a battery formation clamp, which is used for clamping a battery 6 and comprises an upper pressing plate 1, a lower pressing plate 2 and a plurality of stopping pieces 5, wherein the lower pressing plate 2 and the upper pressing plate 1 are correspondingly arranged, and an accommodating cavity 3 for placing the battery 6 is formed between the upper pressing plate 1 and the lower pressing plate 2; the upper pressing plate 1 and/or the lower pressing plate 2 are/is provided with a distance sensor 4, the distance sensor 4 is used for detecting the distance between the upper pressing plate 1 and the lower pressing plate 2, one end of each of the plurality of stoppers 5 is fixedly connected with the lower pressing plate 2 and/or the upper pressing plate 1, and the stoppers 5 are positioned in the accommodating cavity 3.

In order to ensure that the stress on the upper surface of the battery 6 is uniform, in the embodiment, the heights of the plurality of stoppers 5 are equal, and when the upper pressing plate 1 is pressed down to a certain height, the upper pressing plate 1 abuts against the upper end surface of the stopper 5, so that the pressure value can be prevented from being too large, and the problem that the electrolyte in the battery 6 is extruded to cause the reduction of the electrolyte retention amount is avoided.

More specifically, the stopper 5 has a height h, and the distance between the upper platen 1 and the lower platen 2 is d, where h and d satisfy the relationship: h is less than or equal to d, and the height of the stop piece 5 is less than the thickness of the battery 6. By adopting the structure design, the upper pressing plate 1 can be ensured to act on the upper surface of the battery 6 so as to apply pressure to the battery 6, and the problem that the liquid loss of the battery 6 is too heavy due to too large pressing force applied by the upper pressing plate 1 can be avoided.

In this embodiment, the distance sensor 4 is a laser range finder, in another embodiment, the distance sensor 4 is one of an ultrasonic distance measuring sensor and an infrared distance measuring sensor, and a person skilled in the art can select an appropriate distance measuring sensor to measure the distance between the upper platen 1 and the lower platen 2 according to actual requirements, which is not limited in this embodiment.

In the present embodiment, the upper platen 1 and the lower platen 2 are the same in size and shape. With the adoption of the structural design, the upper pressing plate 1 and the lower pressing plate 2 are conveniently aligned.

Preferably, the test accuracy of the distance sensor 4 is less than or equal to 1um.

Preferably, the stop members 5 are provided in 3, 3 stop members 5 are arranged in a line, and the spacing between the 3 stop members 5 is equal.

The embodiment of the utility model provides a still provide a method that promotes 6 infiltration effects of battery and improve interface reaction, it adopts foretell battery formation anchor clamps, specifically as follows:

firstly, the matching of the compaction density and the formation pressure F of the battery 6 is confirmed, and the formation pressure F with the reduced compaction density is obtained through experimental verification so as to meet the current energy density requirement, wherein the experimental data are shown in the following table 1-1.

TABLE 1-1 densifier/formation pressure corresponding to battery thickness liquid retaining table

Next, the thickness and retention of the battery were checked for consistency in different combinations, and the measurements are shown in fig. 2 and 3.

In summary, under the combination of tables 1-1, the thickness difference of each group of batteries is basically within 20um (the precision of the laser range finder is generally 1 um), basically within a controllable range, and the liquid retention difference is within 0.04g, without significant influence. After the data are obtained, setting the average value T (compensation value) of the current battery thickness as a formation target thickness T, and confirming the formation pressure F according to the table verification data;

for example: the design scheme is as follows: anode compacted density 1.7g/mm ³ The formation pressure is constant at 1MPa; if the target compacted density is reduced to 1.65g/mm ³ The required formation pressure F is verified by a single factor to ensure that the cell thickness is equivalent, as shown in tables 1-1,1.65g/mm ³ Under the compaction density of (1.7 g/mm), the formation pressure of 1.51MPa is required to ensure that the thickness and the liquid retention of the battery are within a controllable range, and then (1.7 g/mm) ³ 1 MPa) is equivalent to (1.65 g/mm) ³ ，1.51Mpa)。

When the trigger point of the formation pressure F → F is confirmed, as shown in fig. 5, the experimental sample shows that the thickness growth tendency of the formation SOC (state of charge, i.e., for reflecting the remaining capacity of the battery 6) is reduced after being greater than 30%, and the thickness of the battery 6 at the time when the measurable SOC is 30% is set as T, so that it can be considered that the battery is greatly expanded, the pressure F can be applied to control the thickness of the battery 6, and if the liquid retention of the battery 6 at the time when the SOC is 30% is influenced to a certain extent, the pressure F can be applied after being delayed, specifically, actually.

Finally, the method is carried out according to the experimental analysis, namely, a laser range finder is installed on the upper pressing plate 1 and used for monitoring the thickness of the battery 6 at the moment, the battery core is in rapid expansion at the initial stage of formation charging, the pressure applied by the upper pressing plate 1 is F at the moment for ensuring the liquid retention capacity of the battery, and when the laser range finder monitors that the thickness of the battery expands to the specified thickness T, the formation pressure is increased to F, so that the thickness of the battery is kept near the specified thickness.

Furthermore, it should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments described herein may be combined as a whole by one or more of the claims, to form other embodiments as would be understood by one or more of ordinary skill in the art.

Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A battery formation clamp is used for clamping a battery (6), and is characterized in that: comprises that

An upper platen (1);

the battery box comprises a lower pressing plate (2), wherein the lower pressing plate (2) and the upper pressing plate (1) are correspondingly arranged, and an accommodating cavity (3) for accommodating a battery (6) is formed between the upper pressing plate (1) and the lower pressing plate (2);

the device comprises an upper pressing plate (1) and/or a lower pressing plate (2), wherein a distance sensor (4) is arranged on the upper pressing plate (1) and/or the lower pressing plate (2), and the distance sensor (4) is used for detecting the distance between the upper pressing plate (1) and the lower pressing plate (2).

2. The battery formation jig of claim 1, wherein: the pressing device is characterized by further comprising a plurality of stopping pieces (5), one ends of the stopping pieces (5) are fixedly connected with the lower pressing plate (2) and/or the upper pressing plate (1), and the stopping pieces (5) are located in the accommodating cavity (3).

3. The battery formation jig of claim 2, wherein: the stoppers (5) are equal in height.

4. A battery formation jig according to claim 3 wherein: the height of the stop piece (5) is h, the distance between the upper pressure plate (1) and the lower pressure plate (2) is d, and h and d satisfy the relation: h is less than or equal to d.

5. The battery formation jig of claim 4, wherein: the height of the stopper (5) is smaller than the thickness of the battery (6).

6. The battery formation jig of claim 1, wherein: the distance sensor (4) is one of an ultrasonic distance measuring sensor, a laser distance measuring instrument or an infrared distance measuring sensor.

7. The battery formation jig of claim 1, wherein: the size and the shape of the upper pressing plate (1) and the lower pressing plate (2) are the same.

8. The battery formation jig of claim 1, wherein: the testing precision of the distance sensor (4) is less than or equal to 1um.

9. The battery formation jig of claim 2, wherein: the number of the stop pieces (5) is 3, the 3 stop pieces (5) are arranged in a straight line, and the distance between the 3 stop pieces (5) is equal.

10. A formation apparatus, comprising: the battery formation jig of any one of claims 1 to 9.