CN218849568U - Silica gel pad and formation equipment - Google Patents

Abstract

The utility model discloses a silica gel pad, include: the device comprises a first body, a second body and a third body, wherein two ends of the second body are respectively connected to the first body and the third body, and the first body and the third body are arranged oppositely; the first body comprises a first wall, a transition wall and a second wall, the first wall and the second wall are connected through the transition wall, the thickness of the first wall is larger than that of the second wall, and the thickness of the transition wall is gradually reduced along the direction from the first wall to the second wall. The utility model discloses a silica gel pad can avoid the battery to separate out lithium effectively.

Description

Silica gel pad and formation equipment

Technical Field

The utility model belongs to the technical field of battery manufacture equipment technique and specifically relates to a silica gel pad and formation equipment is related to.

Background

In the related art, formation of a lithium ion battery refers to a process of first charging the lithium ion battery in order to make the battery electrochemically active.

When the battery is formed by using the clamp, because the surface of the battery cell is not flat and certain thickness difference exists between the areas, the pressure applied to each area of the battery cell is not equal during formation.

Because the head of the battery cell cannot bear pressure or bears small pressure, the head diaphragm of the battery cell has poor adhesion with the pole piece and a large gap, and an SEI (Solid Electrolyte Interface) film formed on the surface of the anode of the head is not dense and stable enough, so that lithium precipitation is easy to occur on the head of the battery in the subsequent charging and discharging processes.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a silica gel pad can avoid the battery to analyse lithium effectively.

The utility model discloses still provide a formation equipment that has above-mentioned silica gel pad.

According to the utility model discloses a silica gel pad of first aspect embodiment, include:

the device comprises a first body, a second body and a third body, wherein two ends of the second body are respectively connected to the first body and the third body, and the first body and the third body are arranged oppositely;

the first body comprises a first wall, a transition wall and a second wall, the first wall and the second wall are connected through the transition wall, the thickness of the first wall is larger than that of the second wall, and the thickness of the transition wall is gradually reduced along the direction from the first wall to the second wall.

According to the utility model discloses silica gel pad has following beneficial effect at least: the first body and the third body of silica gel pad are connected with the second body and can be placed into by the power supply core after being arranged oppositely. And then, the first wall covers the packaging area of the battery cell, and the second wall covers the main body part of the battery cell. Therefore, due to the fact that the thicknesses of the first wall and the second wall are different, pressure applied to each area can be equal when the battery cell is formed, and therefore the diaphragm of the head of the battery cell can be tightly bonded with the pole piece, the transmission path of lithium ions in the charging and discharging process is reduced, and lithium precipitation cannot occur after multiple times of charging and discharging. Particularly, the silica gel pad can effectively prevent the battery from separating lithium.

According to the utility model discloses a silica gel pad of some embodiments, first wall the second wall the transition wall all has a plurality ofly, follows silica gel pad's length direction, and is a plurality of first wall and a plurality of the second wall sets up in turn.

According to the utility model discloses a silica gel pad of some embodiments, first wall has two, the second wall has one, the transition wall has two, the both sides of second wall are connected respectively in the difference the transition wall, the transition wall is kept away from one side of second wall connect in first wall.

According to the utility model discloses a silica gel pad of some embodiments, first wall has one, the second wall has one, the transition wall has four, four the transition wall all connect in the edge of second wall, first wall is around all in the transition wall.

According to the utility model discloses a silica gel pad of some embodiments, the thickness scope of first wall is 1mm-5mm.

According to the utility model discloses a silica gel pad of some embodiments, the scope of the width of transition wall is 5mm-30mm, the scope of the thickness difference between the highest and the lowest of transition wall is 0.5mm-3mm.

According to some embodiments of the utility model of the silica gel pad, the thickness range of second wall is 1mm-4mm.

According to the utility model discloses a silica gel pad of some embodiments, the scope of the hardness of silica gel pad is 40H _A -80H _A 。

According to some embodiments of the present invention, the silicone pad is made of silicone.

According to the utility model discloses a formation equipment of second aspect embodiment includes:

a clamp having a clamping groove;

the silicone rubber pad of any one of the embodiments of the first aspect, disposed in the clamping groove.

According to the utility model discloses change into equipment, following beneficial effect has at least: because the thickness of the first wall of the first body of silica gel pad is different with the thickness of second wall, consequently can make each region of electric core receive the pressure of anchor clamps equal, so, the diaphragm of the head of electric core can carry out inseparable bonding with the pole piece to this transmission path who reduces charge-discharge in-process lithium ion can not produce after guaranteeing to discharge many times and analyse the lithium. In particular, the formation device can effectively avoid lithium precipitation of the battery.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention will be further described with reference to the following drawings and examples, in which:

fig. 1 is a schematic view of a silica gel pad according to a first embodiment of the present invention;

FIG. 2 is a side view of the silicone pad of FIG. 1;

FIG. 3 is an enlarged view taken at A in FIG. 2;

fig. 4 is a schematic view of a silica gel pad according to a second embodiment of the present invention;

fig. 5 is a schematic view of a silica gel pad according to a third embodiment of the present invention;

fig. 6 is a schematic diagram of a formation device of some embodiments of the present invention.

Reference numerals are as follows:

the battery pack comprises a silicone rubber pad 10, a first body 100, a first wall 110, a transition wall 120, a second wall 130, a second body 200, a positioning hole 210, a third body 300, a storage tank 310, a battery cell 400, a packaging area 410, a main body part 420 and a clamp 500.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1 to 3, in some embodiments, the silicone pad 10 includes: a first body 100, a second body 200, and a third body 300. Both ends of the second body 200 are connected to the first body 100 and the third body 300, respectively, and the first body 100 and the third body 300 are oppositely disposed. In this way, the first body 100, the second body 200 and the third body 300 together form a storage tank 310, and the storage tank 310 can be used for accommodating the battery cells 400. The second body 200 may further be provided with a plurality of positioning holes 210, so that the plurality of positioning holes 210 may be matched with the battery cell 400 or the fixture 500, and the battery cell 400 is conveniently placed in the storage tank 310 of the silicone rubber pad 10, or the fixture 500 is conveniently positioned with the silicone rubber pad 10.

The first body 100 includes a first wall 110, a transition wall 120, and a second wall 130, the first wall 110 and the second wall 130 are connected by the transition wall 120, a thickness of the first wall 110 is greater than a thickness of the second wall 130, and a thickness of the transition wall 120 is gradually reduced in a direction from the first wall 110 to the second wall 130. Wherein, because the thickness between first wall 110 and the second wall 130 is different, consequently, transition wall 120 can alleviate foretell thickness difference well to make silica gel pad 10 holding battery cell 400, and when anchor clamps 500 centre gripping battery cell 400, the roughness of battery cell 400 is better.

Specifically, the first body 100 and the third body 300 of the silicone rubber pad 10 are connected to the second body 200, and after being oppositely disposed, the battery cell 400 can be placed in the silicone rubber pad. Thereafter, the first wall 110 covers the encapsulation region 410 of the battery cell 400, and the second wall 130 covers the body portion 420 of the battery cell 400. It is conceivable that the thicknesses of the regions of the battery cell 400 are different, and in general, in the actual coating production process, in order to prevent the phenomenon of thick edges of the pole pieces, the coating edges need to be thinned, the thinned region is generally 5-10 mm of the edge, and the thickness of the thinned region is generally 60% -80% of the thickness of the non-thinned region. For a single-lug process design, the adverse effect of skiving on the flatness of the cell 400 can be eliminated by cutting off the edge of the pole piece. In the case of the multi-tab winding process and lamination process, the coating edge is always required to be reserved, and therefore, the problem of poor flatness of the battery caused by thinning is particularly prominent. The greater the number of layers of the wound or laminated cell 400, the more significant the difference in thickness between the head of the cell 400 and the body of the cell 400 due to thinning, specifically, the thickness of the body of the cell 400 is greater than the encapsulation region 410 of the cell 400, and the thickness of the body portion 420 is greater than the encapsulation region 410. Thus, due to the different thicknesses of the first wall 110 and the second wall 130, the pressure applied to each region can be equal when the battery cell 400 is formed, so that the diaphragm at the head of the battery cell 400 can be tightly bonded with the pole piece, the transmission path of lithium ions in the charge and discharge process is reduced, and no lithium precipitation is generated after multiple charges and discharges. If the thicknesses of the first wall 110 and the second wall 130 of the silicone rubber pad 10 are equal, when the silicone rubber pad 10 cooperates with the fixture 500 to clamp the battery cell 400, the pressures applied to the regions of the battery cell 400 are consistent, and the pressure applied to the region of the battery cell 400 with a smaller thickness may be smaller, so that the lithium deposition may occur. Specifically, the silicone rubber gasket 10 can effectively prevent lithium deposition from the battery.

Further, because the types of the battery cells 400 are more, for different battery cells 400, different silicone pads 10 are needed to cover the battery cells 400, so as to cooperate with the fixture 500 to clamp the battery cells 400 and form the battery cells. Different embodiments of the first body 100 are explained below.

Referring to fig. 1, in some embodiments, the first wall 110, the second wall 130 and the transition wall 120 are provided in a plurality, and the plurality of first walls 110 and the plurality of second walls 130 are alternately arranged along the length direction of the silicone pad 10. Specifically, the thickness of the second wall 130 is smaller than that of the first wall 110, so that the second wall 130 covers the body portion 420 of the battery cell 400, and the first wall 110 near the edge of the second wall 130 covers the head portion of the battery cell 400. Thus, the clamp 500 is used for clamping the silica gel pad 10 to indirectly clamp the battery cell 400, so that the battery cell 400 effectively avoids the problem of lithium precipitation.

Referring to fig. 4, in some embodiments, there are two first walls 110, one second wall 130, and two transition walls 120, two sides of the second wall 130 are respectively connected to one side of different transition walls 120, and one side of the transition wall 120 away from the second wall 130 is connected to the first wall 110. Wherein the area of the first wall 110 may be smaller than the area of the second wall 130. Specifically, the silicone pad 10 can make the pressure applied to the encapsulation area 410 equal to the pressure applied to the main body portion 420, so that the diaphragm of the encapsulation area 410 can be tightly bonded to the pole piece.

Referring to fig. 5, in some embodiments, there is one first wall 110, one second wall 130, and four transition walls 120, four transition walls 120 are connected to the edge of the second wall 130, and the first wall 110 surrounds all the transition walls 120. Specifically, the second wall 130 may be square in shape, and thus, four transition walls 120 are each connected at the edge of the square second wall 130. The area of the second wall 130 may be smaller than the area of the first wall 110, thereby accommodating a cell 400 having an area of the encapsulation region 410 that is larger than an area of the body portion 420.

Referring to fig. 1, in some embodiments, the thickness of the first wall 110 ranges from 1mm to 5mm. Specifically, the thickness of the first wall 110 may be 2mm, 2.3mm, or 3mm, and when the thickness of the clamping groove 510 formed by the clamp 500 is greater than the thickness of the battery cell 400 and ranges from 2mm to 3mm, the battery cell 400 may be better wrapped by the silicone rubber pad 10 through the 2.3mm first wall 110, so that the battery cell 400 is formed. It should be noted that the thickness of the first wall 110 may be adjusted according to the thickness of the battery cell 400, and generally, the silicone rubber pad 10 may also be located between the fixture 500 and the battery cell 400 to protect the battery cell 400. Therefore, the silicone pad 10 is not necessarily too thick, nor too thin, and if it is less than 1mm, the processing is difficult, and if it is more than 5mm, unnecessary waste is caused.

Referring to fig. 1, in some embodiments, the thickness difference between the highest and lowest positions of the transition wall 120 ranges from 0.5mm to 3mm, and specifically, the width of the transition wall 120 ranges from 5mm to 30mm. The longer the width of the transition wall 120 is, the smoother the transition between the first wall 110 and the second wall 130 is, so that the cell 400 can have good flatness. And the difference in thickness between the highest and lowest points of the transition wall 120 may be 2.3mm, 3mm, etc. If the difference between the thickness of the transition wall 120 at the highest and lowest points is too large, the width of the transition wall 120 needs to be long, which results in waste of material, and if the difference between the thickness of the transition wall 120 at the highest and lowest points is too small, the flatness of the cell 400 may be large.

Referring to fig. 1, in some embodiments, the thickness of the second wall 130 ranges from 1mm to 4mm. Specifically, the thickness of the second wall 130 may be adjusted according to the thickness of the battery cell 400, and in general, the silicone rubber gasket 10 may also function as a part located between the clamp 500 and the battery cell 400 to protect the battery cell 400. Therefore, the silicone pad 10 is not necessarily too thick, nor too thin, and if it is less than 1mm, the processing is difficult, and if it is more than 4mm, unnecessary waste is caused.

Referring to fig. 1, in some embodiments, the hardness of the silicone pad 10 ranges from 40H _A -80H _A . Specifically, since the silicone rubber pad 10 acts on the surface of the battery cell 400, if the hardness of the silicone rubber member is greater than 80H _A Then, the battery cell 400 is damaged by the too hard silicone rubber pad 10, and if the hardness of the silicone rubber pad 10 is less than 40H _A Then, the too soft silicone rubber pad 10 cannot flatten the battery cell 400.

Referring to fig. 1, in some embodiments, the silicone pad 10 is made of silicon-oxygen based silicone. Specifically, the thermal conductivity of the silicone-based silicone is very high, and since the diaphragm of the battery usually adopts a water-based or oil-based diaphragm, and the activation of the diaphragm requires dual factors of temperature and pressure, the silicone pad 10 made of a material with high thermal conductivity can further improve the adhesive force between the diaphragm and the pole piece at the head of the battery cell 400.

In some embodiments, chamfers are disposed at the edges of the first body 100 and the third body 300, and the radius of the chamfers is greater than or equal to 1.0mm, wherein the chamfers can prevent the corners from being damaged due to stress concentration under high pressure, and the service life of the silica gel pad 10 can be prolonged.

Referring to fig. 6, in some embodiments, the formation apparatus includes: the jig 500 and the silicone rubber pad 10 in the above embodiment. The clamp 500 has a clamping groove 510, and the clamping groove 510 can be used for placing the silica gel pad 10 therein; the silicone pad 10 is disposed in the holding groove 510. Specifically, since the thicknesses of the first wall 110 and the second wall 130 of the first body 100 of the silicone rubber pad 10 are different, the pressures applied to the regions of the battery cell 400 by the fixture 500 can be equal, and thus, the diaphragm at the head of the battery cell 400 can be tightly bonded to the pole piece, so as to reduce the transmission path of lithium ions during charging and discharging, and ensure that no lithium deposition occurs after multiple charging and discharging. In particular, the formation device can effectively avoid lithium precipitation of the battery.

When the battery cell 400 is formed, the silicone rubber pad 10 may be mounted on the laminate of the fixture 500, and the first wall 110 of the silicone rubber pad 10 needs to be mounted on the side where the tab is placed, that is, the encapsulation area 410; placing the cell 400 to be formed into the cell into the fixture 500 equipped with the silica gel pad 10, and applying a predetermined required pressure to fix the cell, so that the first wall 110 of the silica gel pad 10 covers a thinner region of the cell 400, i.e., the encapsulation region 410, and the second wall 130 covers a thicker region of the cell 400, i.e., the main body portion 420; the fixed battery cell 400 is formed, and the single battery cell 400 is manufactured according to the procedures of secondary sealing, shaping, capacity grading, standing and the like. Thus, the probability of lithium deposition in the fabricated battery cell 400 is low.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. Silica gel pad, its characterized in that includes:

the device comprises a first body, a second body and a third body, wherein two ends of the second body are respectively connected to the first body and the third body, and the first body and the third body are arranged oppositely;

the first body comprises a first wall, a transition wall and a second wall, the first wall and the second wall are connected through the transition wall, the thickness of the first wall is larger than that of the second wall, and the thickness of the transition wall is gradually reduced along the direction from the first wall to the second wall.

2. The silicone rubber pad according to claim 1, wherein the first wall, the second wall and the transition wall are provided in plurality, and the plurality of first walls and the plurality of second walls are alternately arranged along a length direction of the silicone rubber pad.

3. The silicone pad according to claim 1, wherein the first wall has two, the second wall has one, and the transition wall has two, two sides of the second wall are respectively connected to different transition walls, and a side of the transition wall away from the second wall is connected to the first wall.

4. The silicone pad according to claim 1, wherein the first wall has one, the second wall has one, and the transition walls have four, four of the transition walls being connected to an edge of the second wall, the first wall surrounding all of the transition walls.

5. The silicone pad according to claim 1, wherein the thickness of the first wall is in the range of 1mm to 5mm.

6. The silicone rubber pad of claim 1, wherein the width of the transition wall is in the range of 5mm-30mm, and the difference in thickness between the highest and lowest points of the transition wall is in the range of 0.5mm-3mm.

7. The silicone pad according to claim 1, wherein the thickness of the second wall is in the range of 1mm to 4mm.

8. The silicone pad according to claim 1, wherein the hardness of the silicone pad is in the range of 40H _A -80H _A 。

9. The silicone pad of claim 1, wherein the silicone pad is made of silicone based silicone.

10. Formation equipment, characterized by comprising:

a clamp having a clamping groove;

the silicone pad of any one of claims 1 to 9, disposed in the clamping groove.

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