KR20230025118A - Formaion tray and formaion tray stack using the same - Google Patents

Abstract

The present invention relates to an activation tray to prevent thermal runaway of battery cells mounted thereon and an activation tray stack using the same. According to the present invention, the activation tray comprises a plurality of cell receiving units disposed in an inner space formed by a tray bottom part and an outer wall provided along the periphery of the tray bottom part. The cell receiving units includes: a partition wall forming the receiving space for receiving battery cell together with the tray bottom part and forming a boundary with other cell receiving units; and a fixing member coupled to the partition wall and fixing the battery cell at a position spaced apart from the tray bottom part. A fixing hole through which the battery cell is inserted and fixed is penetrated and formed in the fixing member and the battery cell inserted into the fixing hole is supported by the inner peripheral surface of the fixing hole, such that a space is formed between the battery cell and the tray bottom part.

Description

Activation tray and activation tray laminate using the same {FORMAION TRAY AND FORMAION TRAY STACK USING THE SAME}

The present invention relates to activating trays.

More specifically, it relates to an activation tray including a fixing part for fixing battery cells at positions spaced apart from the bottom of the tray so that the battery cells do not come into contact with the bottom of the tray.

Further, the present invention relates to an activation tray stack in which the activation trays are stacked.

Recently, secondary batteries capable of charging and discharging have been widely used as energy sources for wireless mobile devices. In addition, secondary batteries are attracting attention as an energy source for electric vehicles, hybrid electric vehicles, etc., which are proposed as a solution to air pollution such as existing gasoline vehicles and diesel vehicles using fossil fuels. Therefore, the types of applications using secondary batteries are diversifying due to the advantages of secondary batteries, and it is expected that secondary batteries will be applied to more fields and products than now.

These secondary batteries are sometimes classified into lithium ion batteries, lithium ion polymer batteries, lithium polymer batteries, etc., depending on the composition of electrodes and electrolytes. It is increasing.

In general, secondary batteries include a cylindrical battery and a prismatic battery in which the electrode assembly is embedded in a cylindrical or prismatic metal can, and a pouch type in which the electrode assembly is embedded in a pouch-type case of an aluminum laminate sheet, depending on the shape of the battery case. The electrode assembly, which is classified as a battery and is embedded in a battery case, is a power generating device capable of charging and discharging, consisting of a positive electrode, a negative electrode, and a separator structure interposed between the positive electrode and the negative electrode. It is classified into a jelly-roll type in which a separator is wound on the surface, and a stack type in which a plurality of positive and negative electrodes of a predetermined size are sequentially stacked in a state in which a separator is interposed.

Meanwhile, a secondary battery is manufactured through a process of assembling a cell and a process of activating the battery. In the battery activation step, the battery is loaded on an activation tray and subjected to a charge/discharge process of charging and discharging under conditions necessary for activation or an aging process of aging under specific conditions.

At this time, there may be cases in which a defective battery cell causing an internal short circuit is mounted on an activation tray or an overvoltage is applied to the battery cell due to a problem in a charging/discharging device. In this case, the battery cell may generate abnormal heat or release gas due to a rapid increase in internal pressure of the battery, which may lead to a thermal runaway phenomenon.

In particular, in the case of a cylindrical battery cell, due to its structure, a thermal runaway phenomenon easily occurs in the vertical direction through the upper and lower surfaces where the electrode terminals of the cylindrical battery cell are located.

Specifically, referring to FIG. 1, an electrode assembly 1 housed in a cylindrical can has a structure in which an anode, a cathode, and a separator are sequentially stacked and wound in a round shape, and a cylindrical center pin 2 is inserted into the core. . The center pin 2 serves as a passage through which gas generated by an internal reaction of the battery cell is discharged. In addition, in the cylindrical battery cell (B), a Current Interruptive Device (CID) is installed between the electrode assembly 1 and the top cap 3 to block current and relieve internal pressure during abnormal operation to prevent thermal runaway. is mounted on Specifically, the top cap 3 forms a positive electrode terminal in a protruding form and has an exhaust hole, and a PTC element (positive temperature coefficient coefficient) that blocks current by greatly increasing battery resistance when the temperature inside the battery rises at the bottom thereof. element) (4), a safety vent (5) that protrudes downward in a normal state and ruptures while protruding when the pressure inside the battery is increased to exhaust gas, and one side of the upper part is combined with the safety vent (5) Connection plates 6 having one lower side connected to the anode of the electrode assembly 1 are sequentially positioned. That is, the cylindrical battery cell (B) has a structure in which internal gas is discharged to the upper surface through the center pin 2 and the top cap 3, and the current blocking member (CID) as described above does not operate normally or , If the internal pressure of the center pin 2 is rapidly generated due to excessive gas generation, thermal runaway occurs, so thermal runaway is likely to occur through the upper and lower surfaces where the electrode terminals of the cylindrical battery cell (B) are located. . In particular, a thermal runaway phenomenon frequently occurs on the upper surface of the battery cell where the positive electrode terminal is located.

On the other hand, as shown in FIG. 2, in the structure of the conventional activation tray 10, only the upper surface of the battery cell (B) is open, and the lower surface of the battery cell (B) is the lower surface of the cell receiving portion (R). It is a structure blocked by the tray bottom portion 11 constituting the. Due to this, when abnormal heat generation or rapid gas discharge occurs in the battery cell B, heat or gas cannot be smoothly discharged, and thus thermal runaway is easily caused. In addition, when the activation trays 10 having such a structure are stacked, even the top of the battery cell is blocked except for the activation tray located at the top, so thermal runaway can be more easily induced. In addition, in the conventional activation tray 10, although the battery cells B are individually accommodated in the cell accommodating portion R and partially separated by the partition walls 13, the cell accommodating portion cell accommodating portion R is an airtight structure that does not have a separate heat or gas outlet. For this reason, when a flame is generated due to thermal runaway even in one battery cell, the flame is not easily suppressed and the flame is transferred to an adjacent battery cell, leading to a chain ignition.

Therefore, there is a need to develop a technology related to an activation tray capable of preventing thermal runaway due to abnormal battery cells and preventing thermal runaway of one battery cell from leading to chain ignition.

Korean Patent Publication No. 10-2020-0127460

The present invention was made to solve the above problems, and provides an activation tray capable of preventing thermal runaway of battery cells mounted on the tray and preventing flames caused by thermal runaway from being transferred to adjacent battery cells. aims to do

In addition, another object of the present invention is to provide an activation tray stacker using the activation tray.

An activation tray according to the present invention for solving the above problems includes a plurality of cell accommodating units in an inner space formed by a tray bottom and an outer wall provided along a circumference of the tray bottom, wherein the cell accommodating units are located at the bottom of the tray. A partition wall that forms an accommodation space in which battery cells are accommodated together with the unit and forms a boundary with other cell accommodation units; and a fixing member coupled to the barrier rib and spaced apart from the bottom portion of the tray so that the battery cells are spaced apart from each other, wherein a fixing hole into which the battery cell is inserted and fixed is formed through the fixing member, and the battery cell inserted into the fixing hole is fixed. It is supported by the inner circumferential surface of the ball, characterized in that the lower surface of the battery cell is exposed through the space formed between the battery cell and the bottom of the tray.

As an example, the inner circumferential surface of the fixing hole may have a region having a smaller diameter than the outer circumferential surface of the battery cell, and the battery cell may be fitted and fixed to the inner circumferential surface in an interference fit method.

As a specific example, the length of the fixing member in the height direction may be smaller than that of the battery cell, so that upper and lower portions of the battery cell protrude from the fixing hole and are exposed to the outside.

As another example, a support rib protruding inwardly from the fixing hole may be formed at the bottom of the fixing hole, and the battery cell inserted into the fixing hole may be supported in the fixing hole by the support rib.

As a specific example, a plurality of support ribs may protrude along the inner circumference of the fixing hole, and a lower surface of the battery cell may be exposed to the outside between the support ribs.

As an example, the fixing member and the barrier rib may be coupled by a connecting rib formed between the fixing member and the barrier rib.

As one example, one or more ventilation holes may be formed at the bottom of the tray.

As a specific example, the ventilation holes may be vertically or left-right symmetrically formed at the bottom of the tray positioned between the barrier ribs.

As another specific example, the ventilation holes may be formed in the bottom portion of the tray facing the circumference of the lower surface of the battery cell.

As an example, the height of the barrier rib may be higher than the height of the battery cell.

As an example, the cell accommodating part may be formed of at least one of polycarbonate (PC) resin and acrylonitrile butadiene styrene (ABS) resin.

Meanwhile, the fixing member may be a tubular member.

Specifically, it may be a cylindrical member.

As one example, the battery cell may be a cylindrical battery cell.

In addition, the present invention provides an activation tray stack in which the activation trays are stacked in multiple stages in a height direction.

According to the present invention, the air flow path can be secured by fixing the battery cells to be spaced apart from the bottom of the tray so that the battery cells do not come into contact with the bottom of the tray. Thus, thermal runaway of battery cells mounted on the tray is prevented, and flames caused by thermal runaway are not easily transferred to adjacent cells.

1 is a cross-sectional view showing a general cylindrical battery cell.
2 is a schematic cross-sectional view of a conventional activation tray.
3 is a schematic cross-sectional view of an activation tray according to one embodiment of the present invention.
4 is a schematic cross-sectional view of an activation tray according to another embodiment of the present invention.
5 is a schematic cross-sectional view of a stack of activation trays according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail. Prior to this, terms or words used in this specification and claims should not be construed as being limited to ordinary or dictionary meanings, and the inventor appropriately uses the concept of terms in order to describe his/her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical spirit of the present invention based on the principle that it can be defined in the following way.

Terms such as "include" or "have" used throughout the specification of the present invention are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or other features, numbers, steps, operations, components, parts, or combinations thereof, are not precluded from being excluded in advance.

In addition, when a part such as a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case where it is "directly on" the other part, but also the case where there is another part in the middle. Conversely, when a part such as a layer, film, region, plate, etc. is said to be "under" another part, this includes not only the case where it is "directly under" the other part, but also the case where there is another part in between. In addition, in the specification of the present invention, being disposed "on" may include the case of being disposed at the bottom as well as at the top.

An activation tray according to the present invention includes a plurality of cell accommodating portions in an inner space formed by a tray bottom portion and an outer wall provided along the circumference of the tray bottom portion, wherein the cell accommodating portions, together with the tray bottom portion, contain battery cells. a barrier rib forming an accommodating space and forming a boundary with other cell accommodating units; and a fixing member coupled to the barrier rib and fixing the battery cell at a position spaced apart from the bottom of the tray, wherein the fixing member is formed by penetrating a fixing hole into which the battery cell is inserted and fixed, and It is characterized in that the battery cell inserted into the ball is supported by the inner circumferential surface of the fixing hole, and a space is formed between the battery cell and the bottom of the tray.

As described above, the conventional activation tray has a problem of easily causing thermal runaway by not smoothly discharging heat or gas when abnormal heat generation or rapid gas discharge occurs in the battery cell. In addition, if a thermal runaway phenomenon occurs even in one battery cell, flames are easily transferred to other battery cells mounted on the tray, leading to chain ignition.

Accordingly, the present invention includes a fixing member for fixing the battery cell at a position spaced apart from the bottom of the tray to form a space in which heat, gas, or flame can be smoothly discharged between the battery cell and the bottom of the tray. to be By fixing the battery cells away from the bottom of the tray and storing them in the activation tray, thermal runaway can be prevented, and even if thermal runaway occurs, the effect on adjacent battery cells can be suppressed.

A more detailed configuration of the present invention described above will be described in more detail using the accompanying drawings and embodiments. Like reference numerals have been used for like elements throughout the description of each figure. In the accompanying drawings, the dimensions of the structures are shown enlarged than actual for clarity of the present invention. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

Hereinafter, the present invention will be described in detail.

(First Embodiment)

3 is a schematic cross-sectional view showing the activation tray 100 according to the first embodiment of the present invention. As an example, a cylindrical battery cell (B) is accommodated. In FIG. 3, for ease of understanding, a cylindrical battery cell (B) is shown in a perspective view. Also, for convenience of description, only three cell accommodating units R are shown, but the number of cell accommodating units R is not particularly limited, and the cell accommodating units R of the activation tray 100 depend on the use and purpose. ) The number of may be provided in various ways.

In the activation tray 100 of this embodiment, a plurality of cell accommodating portions R are provided in the inner space formed by the tray bottom 110 and the outer wall 120 provided along the circumference of the tray bottom 110. a barrier rib 130 which is provided and forms an accommodation space in which the battery cell B is accommodated together with the bottom portion 110 of the tray, and forms a boundary with another cell accommodation portion R; and a fixing member 140 coupled to the barrier rib 130 and fixing the battery cell B at a position spaced apart from the bottom portion 110 of the tray.

The fixing member 140 is coupled to the barrier rib 130, and the battery cell B is spaced apart from the bottom portion 110 of the tray to form a space between the battery cell B and the bottom portion 110 of the tray. It serves to hold it in place. As a result, gas or heat generated from the battery cell (B) is dispersed in a predetermined space formed between the battery cell (B) and the tray bottom 110, and thermal runaway of the battery cell (B) can be prevented. . That is, the activation tray 100 of the present invention improves the problem that heat or gas generated from the lower part of the battery cell cannot be smoothly discharged because the conventional activation tray has only the upper part open. That is, since heat or gas can be smoothly discharged in both the upper direction (a) and the lower direction (b) of the battery cell B, thermal runaway can be effectively prevented.

At this time, the fixing member 140 is a cylindrical member and has a shape corresponding to the cylindrical battery cell (B). By having the same cylindrical shape as the shape of the battery cell, it can be efficiently disposed without occupying a large volume in the limited space of the cell accommodating portion (R). Specifically, when the fixing member 140 is a cylindrical member, when the fixing member 140 occupies a large volume in the cell accommodating portion R, the distance between the battery cell B and the partition wall 130 is too large. It is possible to prevent a problem of restricting the flow path of air that serves as a passage for heat or gas discharge from the battery cell B by narrowing it.

At this time, the method in which the fixing member 140 fixes the battery cell B is that the fixing hole 141 into which the battery cell B is inserted and fixed is formed by penetrating the cylindrical member and inserted into the fixing hole 141. The battery cell (B) is supported by the inner circumferential surface of the fixing hole (141).

Specifically, the inner circumferential surface of the fixing hole 141 has a region having a smaller diameter than the outer circumferential surface of the battery cell (B), and the battery cell (B) is fitted and fixed to the inner circumferential surface in an interference fit method. 3 shows that the diameter of the inner circumferential surface of the fixing hole 141 is slightly smaller than the outer circumferential diameter of the battery cell (B). However, the inner circumferential surface of the fixing hole 141 is provided with a region having a smaller diameter than the outer circumferential surface of the battery cell (B), and if the battery cell (B) can be fitted, an area larger in diameter than the outer circumferential surface of the battery cell (B). can be provided together. For example, the center of the inner circumferential surface of the fixing hole 141 is formed as a region having a smaller diameter than the outer circumferential surface of the battery cell (B), and the upper part of the inner circumferential surface of the fixing hole 141 has a diameter smaller than the outer circumferential surface of the battery cell (B). It can be formed in a large area. That is, the upper portion of the fixing hole 141 into which the battery cell (B) is inserted is larger than the outer circumferential surface of the battery cell (B) to facilitate insertion, and the center portion is slightly smaller in diameter than the inner circumferential surface of the battery cell (B), so that it is fitted tightly. can have a structure.

On the other hand, the fixing member 140 may be formed of a flexible material to facilitate insertion of the battery cell B into the fixing hole 141 or separation from the fixing hole 141 .

In addition, in the present embodiment, the battery cell (B) is provided with a length in the height direction of the fixing member 140 is smaller than the battery cell (B), the upper and lower portions of the battery cell (B) are the fixing hole 141 It protrudes from and is exposed to the outside. Since a part of the battery cell (B) is exposed, the heat generated inside the battery cell (B) is more smoothly discharged by the air circulating in the cell accommodating part (R).

The fixing member 140 and the partition wall 130 are coupled by a connecting rib 150 formed between the fixing member 140 and the partition wall 130 . In the case of further including a connection rib 150 combining the fixing member 140 and the partition wall 130, an air circulation path is additionally formed compared to the case where the fixing member 140 is directly coupled to the partition wall 130. The heat emitted by the battery cell (B) can be smoothly discharged.

One or more ventilation holes 111 are formed in the bottom part 110 of the tray. The ventilation hole 111 provides a passage through which heat and gas are discharged, and compared to the conventional activation tray, heat and gas generated from the upper portion and lower portion of the battery cell B can be smoothly discharged, thereby effectively preventing thermal runaway. can When a flame occurs, it provides a passage through which the flame is discharged. In this embodiment, four vents 111 are formed, but the number of vents is not particularly limited.

The ventilation holes 111 are vertically symmetrically formed in the tray bottom 110 positioned between the partition walls 130 and the partition walls 130 . When formed symmetrically up and down, since the air of the cell accommodating portion R can be smoothly circulated in most areas, heat or gas is more easily discharged. In addition, unlike the present embodiment, the same effect can be obtained even when the ventilation holes 111 are formed symmetrically.

The location where the ventilation hole 111 is formed is the tray bottom 110 facing the circumference of the lower surface of the battery cell (B). Since the lower surface of the battery cell (B) is exposed through the fixing hole 141 of the fixing member 140, when the battery cell (B) is ruptured by thermal runaway, fragments of the ruptured battery cell (B) It can be separated from the bottom of the tray (110). At this time, when the ventilation hole 111 is formed at a position opposite to the center of the lower surface of the battery cell (B) among the bottom portion 110 of the tray, fragments of the battery cell are easily separated through the ventilation hole 111. In particular, when the activation trays 100 are stacked, if fragments of the ruptured battery cells B are separated through the ventilation holes 111, an electrical short circuit is caused to the battery cells B mounted on the other activation trays 100. or cause thermal runaway. Therefore, at this time, when formed in a position opposite to the circumference of the lower surface of the battery cell (B) rather than a position opposite to the center of the lower surface of the battery cell (B) of the tray bottom portion 110, the above risk can prevent

The height of the barrier rib 130 is higher than that of the battery cell (B). By configuring the height of the partition wall 130 to be higher than the height of the battery cell (B), the fragments of the battery cell (B) ruptured by the thermal runaway of the battery cell (B) cross the partition wall 130 or cause thermal runaway. It is possible to suppress the flame generated by the spread to the adjacent battery cell B beyond the barrier rib 130 to cause chain ignition.

Meanwhile, in the present embodiment, the partition wall 130 and the fixing member 140, which are components of the cell accommodating part, are formed of acrylonitrile butadiene styrene (ABS) resin. Specifically, the partition wall 130 and the fixing member 140, which are components of the cell accommodating unit, may be formed of at least one of polycarbonate (PC) resin and acrylonitrile butadiene styrene (ABS) resin. there is. The polycarbonate (PC) resin and the acrylonitrile butadiene styrene (ABS) resin are resins having excellent mechanical strength and flame retardancy, and the flame due to thermal runaway of the battery cell (B) is prevented from the fixing member 140 to the partition wall 130. ), or it can be suppressed from affecting the adjacent battery cell (B) by going over the barrier rib (130). In addition, the tray bottom 110 and the outer wall 120 are similarly formed of at least one of polycarbonate (PC) resin and acrylonitrile butadiene styrene (ABS) resin, so that the above effect can be further maximized.

This embodiment is an activation tray 100 in which cylindrical battery cells B are fixed to the fixing member 140 of the cell accommodating portion R. The positive terminal (B1) of the cylindrical battery cell (B) is located on the lower surface of the battery cell to face the tray bottom portion 110 in which the vent 111 is formed. In the case of a cylindrical battery cell, it is common to have a structure in which a safety member such as a safety vent and a PTC device is provided on a top cap where a positive electrode terminal is formed, and gas generated inside can be discharged through the top cap. Therefore, in many cases, gas inside the battery cell or flame due to thermal runaway is discharged through the positive electrode terminal. Therefore, in the prior art, the positive electrode terminal of the cylindrical battery cell had to be located on the upper surface of the battery cell when accommodated in the battery cell accommodating part for safety reasons. This is because the activation tray has a structure in which the top is open, while the bottom of the tray is closed. However, in the activation tray 100 of the present invention, a space is formed between the battery cell B and the tray bottom 110 by the fixing member 140, so that heat, gas, or flame is transmitted to the battery cell B. It can also be discharged from the lower surface. Due to this, even if the positive terminal of the cylindrical battery cell is located on the lower surface of the battery cell, safety against thermal runaway of the battery cell can be sufficiently secured. That is, as shown in FIG. 3, even when the positive electrode terminal B1 is located on the lower surface of the battery cell B, gas or flame can be discharged through a spaced apart space, and then the bottom of the tray 110 Through the vent 111 formed in, it can be discharged to the outside.

(Second Embodiment)

4 is a schematic cross-sectional view showing an activation tray 200 according to a second embodiment of the present invention. As an example, a cylindrical battery cell is accommodated. In FIG. 4 , for ease of understanding, the cylindrical battery cell B is shown in a perspective view, and the inner circumferential surface of the fixing hole 241 to which the battery cell B is fixed is shown as a cross-sectional view. Also, for convenience of description, only three cell accommodating units R are shown, but the number of cell accommodating units R is not particularly limited, and the cell accommodating units R of the activation tray 100 depend on the use and purpose. ) The number of may be provided in various ways.

In the activation tray 200 of the present embodiment, the battery cell B is supported by the inner circumferential surface of the fixing hole 241 formed through the fixing member 240, and the fixing hole 241 is formed under the fixing hole 241. ) The support rib 242 protruding inward is formed, and the battery cell B inserted into the fixing hole 241 is supported in the fixing hole 241 by the support rib 242. It is different from the embodiment. In the second embodiment, components common to those in the first embodiment are given common reference numerals, and detailed descriptions thereof will be omitted.

As shown in FIG. 4, a support rib 242 protruding inside the fixing hole 241 is formed under the fixing hole 241 so that the battery cell B inserted into the fixing hole 241 is supported. It is supported in the fixing hole 241 by the rib 242.

Since the lower surface of the battery cell (B) is supported by the support rib 242, the inner circumferential surface of the fixing hole 241 has a smaller diameter than the outer circumferential surface of the battery cell (B) in order to forcefully fit the battery cell (B). There is no need to have an area. Therefore, compared to the case where the battery cell (B) is fixed by the interference fitting method, it provides an easier advantage when the battery cell (B) is fixed to the fixing hole 241 or separated from the fixing hole 241. In addition, when a method in which the inner circumferential surface of the fixing hole 241 is provided with a region having a smaller diameter than the outer circumferential surface of the battery cell (B) and the battery cell (B) is fitted to the inner circumferential surface in an interference fit method is applied, the battery cell (B) can be fixed more stably.

In addition, two support ribs 242 protrude along the inner circumference of the fixing hole 241 . The positive terminal B1 located on the lower surface of the battery cell B can fix the battery cell B more stably than when there is only one support rib 242 while being sufficiently exposed to the outside. In this embodiment, although two support ribs 242 are formed, the number of support ribs 242 is not particularly limited, and depending on the weight or size of the battery cell B fixed to the fixing hole 241, the battery cell (B) can be set to an appropriate number that can be sufficiently supported.

(Third Embodiment)

5 is a schematic cross-sectional view showing a stack 1000 of activation trays according to one embodiment of the present invention. As an example, a cylindrical battery cell (B) is accommodated. In FIG. 5, for ease of understanding, a cylindrical battery cell (B) is shown in a perspective view. In addition, for convenience of description, only three cell accommodating portions R of each activation tray 100a, 100b are shown, but the number of cell accommodating portions R is not particularly limited, and the activation tray The number of cell accommodating parts R of (100a, 100b) can be configured in various ways.

Although the activation tray stack 1000 of the present embodiment is illustrated as having the activation trays 100a and 100b of the first embodiment stacked in two stages, it is not limited thereto. In the third embodiment, common reference numerals are given to components common to those of the first embodiment, and detailed descriptions thereof will be omitted.

As described above, in the case of stacking conventional activation trays, except for the uppermost activation tray, the upper portion of the activation tray is also blocked so that the cell accommodating portion R has a completely sealed structure. Due to this, it is more difficult to discharge heat or gas generated from the battery cell B, and thermal runaway can be more easily induced.

On the other hand, in the activation tray stack 1000 of the present embodiment, a space is formed between the battery cell B and the bottom portion 110a of the tray by the fixing member 140a even in the activation tray 100a located at the bottom. Thus, an air circulation passage is formed, and gas or heat emitted from the battery cell B can be prevented from accumulating in the cell accommodating portion R. In addition, each of the cell accommodating parts R has a discharge path for gas, heat, or flame by vent holes 111a formed in the bottom part 110a of the tray. Therefore, even when the activation trays are stacked, it is possible to effectively prevent the effect of thermal runaway of the battery cell B from affecting adjacent cells.

As described above, according to the present invention, the cell receiving portion of the activation tray includes a fixing member for fixing the battery cell at a position spaced apart from the bottom portion of the tray, thereby forming a space between the battery cell and the bottom portion of the tray, There is an effect of preventing thermal runaway of the battery cell by smoothly discharging heat or gas from the battery cell. In addition, even when thermal runaway of the battery cell occurs, the flame can be discharged through the spaced apart space, so that the flame can be prevented from spreading to adjacent battery cells or fragments of the exploded battery cell from being separated. The same effect as above can be obtained even when the activation tray is used to form a laminate.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the drawings disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these drawings. The protection scope of the present invention should be construed according to the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

Meanwhile, terms indicating directions such as up, down, left, right, front, and back are used in this specification, but these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer. It is self-evident that it can

R: cell receptacle
B: battery cell
B1: positive terminal
1: electrode assembly
2: center pin
3: Top cap
4: PTC element
5: safety vent
6: connection plate
100, 200: activation tray
11, 110, 210: tray bottom
111, 211: vent
12, 120, 220: outer wall
13, 130, 230: bulkhead
140, 240: fixing member
141, 241: fixed hole
242: support rib
150, 250: connecting rib
1000: activation tray stack

Claims (15)

A plurality of cell accommodating portions are provided in an inner space formed by a tray bottom portion and an outer wall provided along a circumference of the tray bottom portion,
The cell receiving part,
a barrier rib forming an accommodation space in which battery cells are accommodated together with the bottom portion of the tray and forming a boundary with other cell accommodation units; and
It is coupled to the barrier rib and includes a fixing member for fixing the battery cells to be spaced apart from the bottom of the tray,
A fixing hole into which a battery cell is inserted and fixed is formed through the fixing member, and the battery cell inserted into the fixing hole is supported by an inner circumferential surface of the fixing hole, through a space formed between the battery cell and the bottom of the tray. Activation tray with the lower surface exposed.
According to claim 1,
The inner circumferential surface of the fixing hole has a region having a smaller diameter than the outer circumferential surface of the battery cell,
An activation tray in which battery cells are inserted and fixed to the inner circumferential surface in an interference fit manner.
According to claim 2,
The length of the fixing member in the height direction is formed smaller than the battery cell,
Upper and lower portions of the battery cell protrude from the fixing hole and are exposed to the outside of the activation tray.
According to claim 1,
An activation tray wherein a support rib protrudes into the fixing hole is formed under the fixing hole, and a battery cell inserted into the fixing hole is supported in the fixing hole by the support rib.
According to claim 4,
The activation tray wherein a plurality of support ribs protrude along the inner circumference of the fixing hole, and the lower surface of the battery cell is exposed to the outside between the support ribs.
According to claim 1,
The activation tray of claim 1 , wherein the fixing member and the barrier rib are coupled by a connecting rib formed between the fixing member and the barrier rib.
According to claim 1,
An activation tray having one or more vents formed at the bottom of the tray.
According to claim 7,
The activation tray is formed vertically or horizontally symmetrically at the bottom of the tray positioned between the partition wall and the partition wall.
According to claim 7,
The vent is
An activation tray formed on the bottom of the tray facing the circumference of the lower surface of the battery cell.
According to claim 1,
An activation tray wherein the barrier ribs are higher than the height of the battery cells.
According to claim 1,
The activation tray of claim 1 , wherein the cell accommodating portion is formed of at least one of polycarbonate (PC) resin and acrylonitrile butadiene styrene (ABS) resin.
According to claim 1,
The activating tray according to claim 1, wherein the fixing member is a tubular member.
According to claim 12,
The activating tray according to claim 1 , wherein the fixing member is a cylindrical member.
According to claim 1,
The battery cell is an activation tray of a cylindrical battery cell.
The activation tray of any one of claims 1 to 14 is multi-stage in the height direction.
An activation tray laminate formed by stacking.

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