Foam plate for packaging battery cell
By designing the foam board for battery cell packaging, and using exhaust through holes to form air convection, the problem of corrosion caused by water vapor condensation in the hot environment of the battery cell is solved, and the storage safety and use effect of the battery cell are improved.
Patent Information
- Application Number
- CN202421954028.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-13
AI Technical Summary
In hot environments or rainy seasons, water vapor condensation is prone to occur between the battery cells, causing water droplets to corrode the pole column of the battery cell, affecting the storage safety and use effect of the battery cell.
A foam board for battery cell packaging is designed, with a plurality of first accommodating grooves, each groove bottom wall is equipped with a positive electrode, an explosion-proof valve and a negative electrode fixing groove, and a corresponding exhaust through hole is opened on its bottom wall. The through holes penetrate through both front and back sides of the foam board to form air convection, dissipate heat and prevent water vapor from condensing.
The heat dissipation is achieved through air convection, avoiding water vapor condensation, preventing water droplets from corroding the pole column of the battery cell, and improving the storage safety and use effect of the battery cell.
Smart Images
Figure CN222906384U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery cell packaging, and in particular, to a foam board for battery cell packaging. Background Art
[0002] With the continuous development of the new energy industry, the technology of power batteries is also constantly improving. In production and manufacturing, it is necessary to install, store and transport battery cells. For the storage of battery cells, currently, packaging foam is usually used to package multiple battery cells and store them in a warehouse.
[0003] However, in a hot environment or during the rainy season, water vapor condensation is likely to occur between the battery cells in the warehouse. Since the terminal posts of the battery cells have a metal structure, the water droplets formed by water vapor condensation will corrode the terminal posts of the battery cells, resulting in problems such as poor subsequent use of the battery cells. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a foam board for battery cell packaging, which can avoid the influence of condensed water droplets on corroding the terminal posts of battery cells, and improve the storage safety and subsequent use effect of battery cells.
[0005] The embodiments of the utility model are implemented as follows:
[0006] In a first aspect, the utility model provides a foam board for battery cell packaging. The foam board for battery cell packaging is provided with a plurality of first accommodation grooves, and the plurality of first accommodation grooves are used for installing the tops of battery cells. The bottom wall of each first accommodation groove is provided with a positive electrode fixing groove, an explosion-proof valve fixing groove and a negative electrode fixing groove, and the positive electrode fixing groove, the explosion-proof valve fixing groove and the negative electrode fixing groove are arranged at intervals in sequence;
[0007] Wherein, a positive electrode exhaust through hole is provided on the bottom wall of the positive electrode fixing groove, an explosion-proof valve exhaust through hole is provided on the bottom wall of the explosion-proof valve fixing groove, and a negative electrode exhaust through hole is provided on the bottom wall of the negative electrode fixing groove.
[0008] In an optional embodiment, an insulating coating is provided on the positive electrode fixing groove, the explosion-proof valve fixing groove, the negative electrode fixing groove, the positive electrode exhaust through hole, the explosion-proof valve exhaust through hole and the negative electrode exhaust through hole.
[0009] In an optional embodiment, the insulating coating is made of polyurethane.
[0010] In an optional embodiment, the depths of the positive electrode exhaust through hole, the explosion-proof valve exhaust through hole and the negative electrode exhaust through hole are all 30 mm to 70 mm.
[0011] In an alternative embodiment, the depths of the positive electrode fixing groove, the explosion-proof valve fixing groove, and the negative electrode fixing groove are all 5 mm to 30 mm.
[0012] In an alternative embodiment, the depth of the first accommodating groove is 20 mm to 70 mm.
[0013] In an alternative embodiment, the positive electrode exhaust through-hole, the explosion-proof valve exhaust through-hole, and the negative electrode exhaust through-hole are all circular through-holes.
[0014] In an alternative embodiment, the foam board for cell packaging is further provided with a plurality of second accommodating grooves, the plurality of second accommodating grooves and the plurality of first accommodating grooves are respectively located on opposite sides of the foam board for cell packaging, and the plurality of second accommodating grooves are used for mounting the bottom of the cell.
[0015] In an alternative embodiment, the plurality of second accommodating grooves are arranged in one-to-one correspondence with the plurality of first accommodating grooves, and each second accommodating groove is simultaneously communicated with the positive electrode exhaust through-hole, the explosion-proof valve exhaust through-hole, and the negative electrode exhaust through-hole.
[0016] In an alternative embodiment, the depth of the second accommodating groove is 30 mm to 60 mm.
[0017] The beneficial effects of the embodiments of the present utility model include:
[0018] The foam board for cell packaging is provided with a plurality of first accommodating grooves, the plurality of first accommodating grooves are used for mounting the top of the cell, the bottom wall of each first accommodating groove is provided with a positive electrode fixing groove, an explosion-proof valve fixing groove, and a negative electrode fixing groove, and the positive electrode fixing groove, the explosion-proof valve fixing groove, and the negative electrode fixing groove are arranged at intervals in sequence; wherein, the bottom wall of the positive electrode fixing groove is provided with a positive electrode exhaust through-hole, the bottom wall of the explosion-proof valve fixing groove is provided with an explosion-proof valve exhaust through-hole, and the bottom wall of the negative electrode fixing groove is provided with a negative electrode exhaust through-hole.
[0019] When packaging the battery cells, first place multiple battery cells corresponding to the arrangement of multiple first accommodating grooves, and then install the side of the foam board for battery cell packaging with the first accommodating grooves on the tops of the multiple battery cells, so that the multiple first accommodating grooves are installed in one-to-one correspondence with the multiple battery cells, and the positive electrode posts, explosion-proof valves, and negative electrode posts on the top of each battery cell are respectively arranged in the positive electrode fixing grooves, explosion-proof valve fixing grooves, and negative electrode fixing grooves, making the installation stable; by respectively opening positive electrode exhaust through holes, explosion-proof valve exhaust through holes, and negative electrode exhaust through holes on the bottom walls of the corresponding fixing grooves, that is, the through holes penetrate through the front and back sides of the foam board for battery cell packaging, so that the air in the spaces where the positive electrode posts, explosion-proof valves, and negative electrode posts of the battery cells are located can form convection. In this way, the humid and hot air formed in a hot environment or during the plum rain season can flow out through the through holes, achieving the function of heat dissipation, thereby avoiding the condensation of water vapor in the space above the battery cells and preventing the water droplets formed by condensation from corroding the battery cell electrode posts, improving the storage safety of the battery cells and the subsequent use effect. Description of the Drawings
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0021] Figure 1 Structural schematic diagram of the first perspective of the foam board for battery cell packaging provided by the embodiment of the present invention;
[0022] Figure 2 Structural schematic diagram of the second perspective of the foam board for battery cell packaging provided by the embodiment of the present invention;
[0023] Figure 3 Structural schematic diagram of the first accommodating groove provided by the embodiment of the present invention;
[0024] Figure 4 For Figure 2 Local enlarged view of part A in
[0025] Figure 5 Structural schematic diagram of the third perspective of the foam board for battery cell packaging provided by the embodiment of the present invention.
[0026] Reference numerals: 100 - foam board for battery cell packaging; 10 - first accommodating groove; 21 - positive electrode fixing groove; 22 - explosion-proof valve fixing groove; 23 - negative electrode fixing groove; 31 - positive electrode exhaust through hole; 32 - explosion-proof valve exhaust through hole; 33 - negative electrode exhaust through hole; 40 - second accommodating groove. Detailed Embodiment
[0027] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.
[0028] Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.
[0029] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0030] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.
[0031] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0032] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0033] As described in the background art, in production and manufacturing, it is necessary to install, store and transport battery cells. For the storage of battery cells, currently, multiple battery cells are usually packaged with packaging foam and stored in a warehouse. However, in a hot environment or during the rainy season, water vapor condensation is likely to occur between the battery cells in the warehouse. Since the terminal posts of the battery cells have a metal structure, the water droplets formed by the condensation of water vapor will corrode the terminal posts of the battery cells, resulting in problems such as poor subsequent use of the battery cells.
[0034] Based on this, please refer to Figures 1 - 5 , an embodiment of the present utility model provides a foam board 100 for packaging battery cells, which can effectively improve the above-mentioned technical problems, that is, it can avoid the influence of the condensed water droplets on corroding the terminal posts of the battery cells, and improve the storage safety and subsequent use effect of the battery cells. The foam board 100 for packaging battery cells will be described in detail below.
[0035] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic structural view of the foam board 100 for packaging battery cells provided in this embodiment from a first perspective, Figure 2 is a schematic structural view of the foam board 100 for packaging battery cells provided in this embodiment from a second perspective. Combining Figure 1 and Figure 2 , the foam board 100 for packaging battery cells is provided with a plurality of first accommodation grooves 10 for installing the tops of the battery cells. It is easy to understand that the tops of the battery cells are provided with a positive terminal post, an explosion-proof valve and a negative terminal post. The first accommodation grooves 10 can conveniently protect the positive and negative terminal posts and the explosion-proof valve of the battery cells.
[0036] Specifically, please refer to Figure 3 and Figure 4 , Figure 3 is a schematic structural view of the first accommodation groove 10 provided in this embodiment, Figure 4 is Figure 2 a partial enlarged view of the A position in Figures 1 - 4 . Combining
[0037] When packaging the battery cells, first place multiple battery cells corresponding to the arrangement of multiple first accommodating grooves 10, and then install the side of the battery cell packaging foam board 100 with the first accommodating grooves 10 on the tops of the multiple battery cells, so that the multiple first accommodating grooves 10 are installed corresponding to the multiple battery cells one by one, and the positive electrode posts, explosion-proof valves, and negative electrode posts on the top of each battery cell are respectively arranged in the positive electrode fixing grooves 21, explosion-proof valve fixing grooves 22, and negative electrode fixing grooves 23, making the installation stable; by respectively opening a positive electrode exhaust through hole 31, an explosion-proof valve exhaust through hole 32, and a negative electrode exhaust through hole 33 in the bottom walls of the corresponding fixing grooves, that is, the through holes penetrate through the front and back sides of the battery cell packaging foam board 100, so that the air in the spaces where the positive electrode posts, explosion-proof valves, and negative electrode posts of the battery cells are located can form a convection. In this way, the humid and hot air formed in a hot environment or during the rainy season can flow out through the through holes, achieving the effect of heat dissipation, thereby avoiding the condensation of water vapor in the top space of the battery cells and preventing the water droplets formed by condensation from corroding the battery cell electrode posts, improving the storage safety of the battery cells and the subsequent use effect.
[0038] Furthermore, in order to reduce the problem of condensate formation on the surface of the battery cells or the packaging foam caused by temperature differences, in this embodiment, insulating coatings are provided on the positive electrode fixing grooves 21, explosion-proof valve fixing grooves 22, negative electrode fixing grooves 23, positive electrode exhaust through holes 31, explosion-proof valve exhaust through holes 32, and negative electrode exhaust through holes 33. The insulating coating can be in the form of foam glue, waterproof glue, or hydrogel, etc., and can block part of the water vapor and liquid from leaking to the positive and negative electrode posts of the battery cells, further preventing the electrode posts from being corroded and ensuring the storage safety of the battery cells.
[0039] It should be noted that in this embodiment, the material of the insulating coating is polyurethane, which has the characteristics of heat insulation, sound insulation, earthquake resistance, oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness, and elasticity. Of course, in other embodiments, the material of the insulating coating can also be other materials such as polyethylene.
[0040] Optionally, the depths of the positive electrode exhaust through hole 31, the explosion-proof valve exhaust through hole 32, and the negative electrode exhaust through hole 33 are all: 30 mm to 70 mm. For example, the depth can be 30 mm, 40 mm, 50 mm, 60 mm, or 70 mm, etc. Of course, in some other implementation manners, the depth ranges of the positive electrode exhaust through hole 31, the explosion-proof valve exhaust through hole 32, and the negative electrode exhaust through hole 33 can also be other values, and the specific values need to be determined according to the specific packaging design requirements of the battery cell packaging foam board 100.
[0041] Optionally, the depths of the positive electrode fixing groove 21, the explosion-proof valve fixing groove 22, and the negative electrode fixing groove 23 are all: 5 mm to 30 mm. For example, the depth can be 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, or 30 mm, etc. Of course, in other embodiments, the depth ranges of the positive electrode fixing groove 21, the explosion-proof valve fixing groove 22, and the negative electrode fixing groove 23 can also be other values, which need to be determined according to the specifications of the positive electrode post, negative electrode post, and explosion-proof valve of the battery cell, as well as the specific packaging design requirements of the foam board 100 for battery cell packaging.
[0042] Optionally, the depth of the first accommodating groove 10 is: 20 mm to 70 mm. For example, the depth can be 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, or 70 mm, etc. Of course, in some other embodiments, the depth range of the first accommodating groove 10 can also be other values, and its specific value needs to be determined according to the usage specifications of the battery cell and the specific packaging design requirements of the foam board 100 for battery cell packaging.
[0043] Please continue to combine Figure 3 and Figure 4 , in this embodiment, the positive electrode exhaust through hole 31, the explosion-proof valve exhaust through hole 32, and the negative electrode exhaust through hole 33 are all circular through holes, which can facilitate processing and better form air convection. Of course, in other embodiments, the positive electrode exhaust through hole 31, the explosion-proof valve exhaust through hole 32, and the negative electrode exhaust through hole 33 can also be other shapes, such as oval, square, triangular, or trapezoidal, etc.
[0044] When actually packaging the battery cell, in addition to packaging the top of the battery cell, the bottom of the battery cell also needs to be packaged. Moreover, the battery cells can be stacked and packaged through packaging foam, that is, after packaging the top of a group of battery cells through packaging foam, another group of battery cells is stacked above the previous group of battery cells, and the bottom of the other group of battery cells is continuously packaged through packaging foam.
[0045] Therefore, in this embodiment, in order to improve the adaptability of the foam board 100 for battery cell packaging, please refer to Figure 5 , Figure 5 is a schematic structural diagram of the third perspective of the foam board 100 for battery cell packaging provided in this embodiment. Combining Figure 1 , Figure 2 and Figure 5 , the foam board 100 for battery cell packaging is also provided with a plurality of second accommodating grooves 40. The plurality of second accommodating grooves 40 and the plurality of first accommodating grooves 10 are respectively located on opposite sides of the foam board 100 for battery cell packaging, and the plurality of second accommodating grooves 40 are used for installing the bottom of the battery cell.
[0046] It is easy to understand that for the same foam board 100 for battery cell packaging, it can be understood that the first accommodation groove 10 on its back is used to install the tops of the first group of battery cells, and the second accommodation groove 40 on its reverse side is used to install the bottoms of the second group of battery cells. In this way, by manufacturing the same foam board 100 for battery cell packaging, the stacked packaging of multiple groups of multi-layer battery cells can be realized, thus saving costs and improving packaging efficiency.
[0047] Further, in this embodiment, the multiple second accommodation grooves 40 are arranged in one-to-one correspondence with the multiple first accommodation grooves 10, and each second accommodation groove 40 is simultaneously communicated with the positive electrode exhaust through hole 31, the explosion-proof valve exhaust through hole 32, and the negative electrode exhaust through hole 33. That is to say, the arrangement direction of the multiple first accommodation grooves 10 is the same as that of the multiple second accommodation grooves 40, which can also be understood as that their length extension directions are the same, and their width extension directions are also the same, so that the arrangement mode of each layer of battery cells after packaging is the same. In addition, it should be noted that the air in the positive electrode exhaust through hole 31, the explosion-proof valve exhaust through hole 32, and the negative electrode exhaust through hole 33 is discharged through the second accommodation groove 40.
[0048] Of course, in other embodiments, the positive electrode exhaust through hole 31, the explosion-proof valve exhaust through hole 32, and the negative electrode exhaust through hole 33 may not be communicated with the second accommodation groove 40 either, that is, the first accommodation groove 10 and the second accommodation groove 40 are not arranged in correspondence. It is easy to understand that in some embodiments, the multiple first accommodation grooves 10 and the multiple second accommodation grooves 40 can be arranged alternately on the front and back sides of the foam board 100 for battery cell packaging, so that the air in the positive electrode exhaust through hole 31, the explosion-proof valve exhaust through hole 32, and the negative electrode exhaust through hole 33 can be discharged well to form a convection.
[0049] Optionally, the depth of the second accommodation groove 40 is: 30 mm to 60 mm. For example, the depth can be 30 mm, 40 mm, 50 mm, or 60 mm, etc. Of course, in other embodiments, the depth range of the second accommodation groove 40 can also be other values, and its specific value also needs to be determined according to the use specification size of the battery cell and the specific packaging design requirements of the foam board 100 for battery cell packaging.
[0050] In summary, the embodiments of the present utility model provide a foam board 100 for cell packaging. The foam board 100 for cell packaging is provided with a plurality of first accommodation grooves 10, and the plurality of first accommodation grooves 10 are used for installing the tops of cells. The bottom wall of each first accommodation groove 10 is provided with a positive electrode fixing groove 21, an explosion-proof valve fixing groove 22, and a negative electrode fixing groove 23, and the positive electrode fixing groove 21, the explosion-proof valve fixing groove 22, and the negative electrode fixing groove 23 are arranged at intervals in sequence; wherein, a positive electrode exhaust through hole 31 is provided on the bottom wall of the positive electrode fixing groove 21, an explosion-proof valve exhaust through hole 32 is provided on the bottom wall of the explosion-proof valve fixing groove 22, and a negative electrode exhaust through hole 33 is provided on the bottom wall of the negative electrode fixing groove 23.
[0051] That is to say, when packaging the cells, first place the plurality of cells corresponding to the arrangement of the plurality of first accommodation grooves 10, and then install the side of the foam board 100 for cell packaging with the first accommodation grooves 10 on the tops of the plurality of cells, so that the plurality of first accommodation grooves 10 are installed in one-to-one correspondence with the plurality of cells, and the positive electrode posts, explosion-proof valves, and negative electrode posts on the top of each cell are respectively arranged in the positive electrode fixing groove 21, the explosion-proof valve fixing groove 22, and the negative electrode fixing groove 23, making the installation firm; by respectively providing the positive electrode exhaust through hole 31, the explosion-proof valve exhaust through hole 32, and the negative electrode exhaust through hole 33 on the bottom walls of the corresponding fixing grooves, that is, the through holes penetrate through the front and back sides of the foam board 100 for cell packaging, so that the air in the spaces where the positive electrode posts, explosion-proof valves, and negative electrode posts of the cells are located can form convection. In this way, the humid and hot air formed in a hot environment or the rainy season can flow out through the through holes, achieving the effect of heat dissipation, thereby avoiding the condensation of water vapor in the top space of the cells and preventing the water droplets formed by condensation from corroding the cell electrode posts, improving the storage safety of the cells and the subsequent use effect.
[0052] The above are only specific embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A foam board for battery cell packaging, characterized in that: The foam plate (100) for cell packaging is provided with a plurality of first accommodating grooves (10), the plurality of first accommodating grooves (10) being used to install the top of the cell, the bottom wall of each of the first accommodating grooves (10) being provided with a positive electrode fixing groove (21), an explosion-proof valve fixing groove (22) and a negative electrode fixing groove (23), and the positive electrode fixing groove (21), the explosion-proof valve fixing groove (22) and the negative electrode fixing groove (23) are sequentially arranged at intervals; The bottom wall of the positive electrode fixing groove (21) is provided with a positive electrode exhaust through hole (31), the bottom wall of the explosion-proof valve fixing groove (22) is provided with an explosion-proof valve exhaust through hole (32), and the bottom wall of the negative electrode fixing groove (23) is provided with a negative electrode exhaust through hole (33).
2. The foam sheet for battery cell packaging according to claim 1, characterized in that: The positive electrode fixing groove (21), the explosion-proof valve fixing groove (22), the negative electrode fixing groove (23), the positive electrode exhaust through hole (31), the explosion-proof valve exhaust through hole (32) and the negative electrode exhaust through hole (33) are all provided with an insulating coating.
3. The foam sheet for battery cell packaging according to claim 2, characterized in that: The material of the insulating coating is polyurethane.
4. The foam sheet for battery cell packaging according to claim 1, characterized in that: The depths of the positive electrode exhaust through hole (31), the explosion-proof valve exhaust through hole (32) and the negative electrode exhaust through hole (33) are all 30 mm to 70 mm.
5. The foam sheet for battery cell packaging according to claim 1, characterized in that: The depths of the positive electrode fixing groove (21), the explosion-proof valve fixing groove (22) and the negative electrode fixing groove (23) are all 5 mm to 30 mm.
6. The foam sheet for battery cell packaging according to claim 1, characterized in that: The depth of the first containing groove (10) is 20 mm to 70 mm.
7. The foam sheet for battery cell packaging according to claim 1, characterized in that: The positive electrode exhaust through hole (31), the explosion-proof valve exhaust through hole (32) and the negative electrode exhaust through hole (33) are all circular through holes.
8. The foam sheet for battery cell packaging according to claim 1, characterized in that: The foam plate (100) for packaging battery cells is also provided with a plurality of second accommodating grooves (40), the plurality of second accommodating grooves (40) and the plurality of first accommodating grooves (10) are respectively located on two opposite sides of the foam plate (100) for packaging battery cells, and the plurality of second accommodating grooves (40) are used for installing the bottom of the battery cells.
9. The foam sheet for battery cell packaging according to claim 8, characterized in that: The plurality of second accommodating grooves (40) are arranged in one-to-one correspondence with the plurality of first accommodating grooves (10), and each of the second accommodating grooves (40) is simultaneously connected to the positive electrode exhaust through hole (31), the explosion-proof valve exhaust through hole (32) and the negative electrode exhaust through hole (33).
10. The foam sheet for battery cell packaging according to claim 8, characterized in that: The depth of the second containing groove (40) is 30 mm to 60 mm.