Packaging tool, battery cell and battery pack

Abstract

The invention relates to the technical field of battery cells, and discloses a packaging tool, a battery cell and a battery pack, and the packaging tool comprises a supporting plate and a pressing plate. When the packaging tool with the structure is used, the packaging edge of the battery cell is firstly placed on the supporting plate, and the end part of the packaging edge is propped against the positioning baffle plate above the top surface of the supporting plate, so that the positioning of the packaging edge is realized, and rapid feeding and clamping and high-precision positioning can be realized. The length of the packaging edge extending out of the outer end face of the supporting plate is controlled by controlling the distance between the positioning baffle and the outer end face of the supporting plate, the extending length of the packaging edge can be controlled within a proper range, under the condition that the length of an outer packaging film of a pole group is certain, the edge close to the packaging edge can be prevented from being pressed in the heat sealing process of a tool, glue overflowing is prevented, and production efficiency is improved. The appearance of the battery cell can be ensured; meanwhile, the situation that the tool presses the pole group in the battery cell due to the fact that the extending distance of the packaging edge is too long can be avoided, damage to the connecting section between the pole lug and the pole group is avoided, and the safety and the production efficiency of the battery cell can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cells, and particularly to a packaging tooling, a battery cell and a battery pack. Background Art

[0002] A soft-pack battery cell includes a pole group and a packaging film, etc. The packaging film wraps and protects the pole group. During the assembly process of the packaging film and the pole group, a receiving groove is first stamped and formed at a specified position of the packaging film, the pole group is placed in the receiving groove, and then the packaging film is folded and heat-sealed to complete the packaging of the pole group.

[0003] During the top-sealing process of the battery cell, a packaging tooling is used. The packaging tooling includes a support plate and a pressing plate. First, the packaging edge of the battery cell is placed on the support plate, and the pressing plate moves downward and presses against the packaging edge of the battery cell. The pressing plate generates heat to complete the pressing of the packaging edge. When top-sealing the battery cell, photo positioning is adopted, but the positioning accuracy of photo positioning is not good, resulting in glue overflow at the packaging edge of some battery cells, and some battery cells are pressed by the packaging tooling onto the pole group inside the battery cell, causing damage to the connecting section between the pole ear and the pole group, affecting the appearance, safety and production efficiency of the battery cell. Summary of the Invention

[0004] In view of this, the present invention provides a packaging tooling, a battery cell and a battery pack to solve the problem of poor positioning effect of the existing packaging tooling during top-sealing positioning.

[0005] In a first aspect, the present invention provides a packaging tooling, including:

[0006] A support plate, with a positioning baffle provided outside the outer end face in the width direction of the support plate. The positioning baffle extends along the height direction of the support plate, and the positioning baffle is spaced from the outer end face of the support plate. The top surface of the positioning baffle is higher than the top surface of the support plate. When heat-sealing the battery cell, the end of the packaging edge of the battery cell is adapted to abut against the positioning baffle;

[0007] A pressing plate, adapted to press against the upper side of the support plate.

[0008] Beneficial effects: When using the packaging tooling with this structure, first place the packaging edge of the battery cell on the support plate. When the end of the packaging edge abuts against the positioning baffle above the top surface of the support plate, the positioning of the packaging edge is achieved, which can realize rapid feeding and clamping and high-precision positioning. By controlling the distance between the positioning baffle and the outer end face of the support plate, the length of the packaging edge extending out of the outer end face of the support plate can be controlled, and the extending length of the packaging edge can be controlled within a suitable range. When the length of the outer packaging film of the pole group is certain, it can be avoided that the tooling presses against the edge near the packaging edge during heat-sealing, preventing glue overflow, and ensuring the appearance of the battery cell; at the same time, it can also be avoided that the tooling presses against the pole group inside the battery cell due to the overlong extending distance of the packaging edge, avoiding damage to the connecting section between the pole ear and the pole group, and being able to improve the safety and production efficiency of the battery cell.

[0009] In an alternative embodiment, the positioning baffle is parallel to the outer end surface in the width direction of the support plate, and the distance between the positioning baffle and the outer end surface of the support plate is L, where 0.3 mm ≤ L ≤ 30 mm.

[0010] Beneficial effects: By setting it in this way, the distance between the positioning baffle and the outer end surface of the support plate can be controlled within an appropriate range, so that the distance that the encapsulation film extends out of the support plate can be controlled within a suitable range, effectively avoiding glue overflow or the tooling pressing on the electrode group, and at the same time avoiding waste of materials and space.

[0011] In an alternative embodiment, the encapsulation film of the battery cell includes a PP layer, and the thickness of the PP layer is x. When 0.06 mm ≤ 2x ≤ 0.3 mm, L ≥ 0.3 mm; when 0.3 mm < 2x ≤ 1.1 mm, L ≥ 0.5 mm; when 1.1 mm < 2x ≤ 3 mm, L ≥ 2 mm.

[0012] Beneficial effects: In this way, the lower limit value of L can be determined according to different PP layer thicknesses, effectively preventing glue overflow and avoiding waste of materials at the same time.

[0013] In an alternative embodiment, during heat sealing, the height of the top surface of the positioning baffle above the top surface of the encapsulation film is h, where 1 mm ≤ h ≤ 50 mm.

[0014] Beneficial effects: By setting it in this way, the height of the positioning baffle above the encapsulation film can be controlled within an appropriate range, preventing the encapsulation edge from deforming and warping beyond the positioning baffle, effectively ensuring the positioning effect of the positioning baffle, and at the same time avoiding waste of materials and space due to the excessive height of the positioning baffle.

[0015] In an alternative embodiment, the length of the positioning baffle extending along the length direction of the support plate is L1, where 3 mm ≤ L1 ≤ 200 mm.

[0016] Beneficial effects: By setting it in this way, the length of the positioning baffle can be controlled within a suitable range, preventing the length of the positioning baffle from being too small and damaging the encapsulation film when the encapsulation film contacts the positioning baffle, and at the same time avoiding waste of materials and space due to the excessive length of the positioning baffle, and also controlling the weight of the encapsulation tooling.

[0017] In an alternative embodiment, a first pressing strip extending horizontally towards the outer end of the support plate is provided on the outer end face of the support plate, and a second pressing strip extending horizontally towards the outer end of the pressing plate is provided on the outer end face of the pressing plate; during hot pressing, the first pressing strip and the second pressing strip face each other, and the first pressing strip, the second pressing strip and the positioning baffle have an overlapping area in the length direction of the support plate. The distance between the top surface of the first pressing strip and the bottom surface of the encapsulation film is g1, and the distance between the bottom surface of the second pressing strip and the top surface of the encapsulation film is g2, where 0.3 mm ≤ g1 ≤ 1 mm and 0.3 mm ≤ g2 ≤ 1 mm.

[0018] Beneficial effects: By setting in this way, the distance g1 between the top surface of the first pressing strip and the bottom surface of the encapsulation film and the distance g2 between the bottom surface of the second pressing strip and the top surface of the encapsulation film can be controlled within an appropriate range, which can ensure the up and down space for the flow of the adhesive layer during heat sealing, without the need to extend the length of the encapsulation film protruding from the support plate, and can effectively prevent glue overflow; it can also enable the first pressing strip and the second pressing strip to effectively flatten the encapsulation film in the area of the positioning baffle, and can ensure the flatness of the encapsulation film.

[0019] In an alternative embodiment, the positioning baffle is provided on the first pressing strip. During hot pressing, the distance between the inner wall surface of the positioning baffle and the outer wall surface of the second pressing strip is g3, where 0.2 mm ≤ g3 ≤ 3 mm.

[0020] Beneficial effects: This can ensure that there is enough distance between the positioning baffle and the second pressing strip, avoiding interference and wear between the two during assembly and generating metal debris, and can ensure the insulation of the battery cell; at the same time, it can avoid the distance between the positioning baffle and the second pressing strip being too large and reducing the length of the second pressing strip protruding from the pressing plate, ensuring that the first pressing strip can cooperate with the second pressing strip to flatten the encapsulation film.

[0021] In an alternative embodiment, the length of the positioning baffle extending along the length direction of the support plate is L1, the length of the second pressing strip extending along the length direction of the support plate is L2, and the length of the first pressing strip extending along the length direction of the support plate is L3, where L1 + 3 mm ≤ L2 ≤ 200 mm; L1 + 3 mm ≤ L3 ≤ 200 mm.

[0022] Beneficial effects: This can make the lengths of the first pressing strip and the second pressing strip adapt to the length of the positioning baffle, such that the lengths of the first pressing strip and the second pressing strip are greater than the length of the positioning baffle, avoiding the lengths of the first pressing strip and the second pressing strip being too small, ensuring that the two pressing strips can effectively flatten the encapsulation film in the area of the positioning baffle, and at the same time can avoid waste of materials and space.

[0023] In a second aspect, the present invention also provides a battery cell, which is encapsulated using the encapsulation tooling of any of the above embodiments.

[0024] Beneficial effects: When encapsulating the battery cell with this structure, the end of the encapsulation edge abuts against the positioning baffle above the top surface of the support plate to achieve the positioning of the encapsulation edge, enabling rapid feeding and clamping and high-precision positioning. By controlling the distance between the positioning baffle and the outer end face of the support plate, the length of the encapsulation edge extending out of the outer end face of the support plate can be controlled, and the extension length of the encapsulation edge can be controlled within a suitable range. This can prevent the hot sealing of the tooling edge from pressing against the edge near the encapsulation edge, prevent glue overflow, and ensure the appearance of the battery cell. At the same time, it can also prevent the tooling from pressing into the internal electrode group of the battery cell due to the excessive extension distance of the encapsulation edge, avoid damaging the connection section between the electrode tab and the electrode group, and improve the safety and production efficiency of the battery cell.

[0025] In a second aspect, the present invention also provides a battery pack, including the above-mentioned battery cell. The battery pack includes the battery cell and has the same technical effects as the battery cell, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 The front view of a packaging tooling according to an embodiment of the present invention;

[0028] Figure 2 is Figure 1 The side view of the shown packaging tooling;

[0029] Figure 3 is Figure 1 The bottom view of the middle pressing plate;

[0030] Figure 4 is Figure 1 The top view of the middle support plate;

[0031] Figure 5 is Figure 1 The front view of the shown packaging tooling during hot pressing and encapsulation in cooperation with the battery cell;

[0032] Figure 6 is Figure 5 The partial enlarged view of part A in;

[0033] Figure 7 is Figure 5 The cross-sectional view taken along the A-A direction of;

[0034] Figure 8 is Figure 7 The partial enlarged view of part B in;

[0035] Figure 9 is Figure 1 The top view of the encapsulation tooling cooperating with the battery cell during hot press encapsulation as shown;

[0036] Figure 10 is Figure 1 The three-dimensional structure schematic diagram of the encapsulation tooling cooperating with the battery cell during hot press encapsulation as shown;

[0037] Figure 11 is Figure 1 The exploded view of the encapsulation tooling and the battery cell as shown;

[0038] Figure 12 is the cross-sectional view of the encapsulation film.

[0039] Explanation of reference numerals:

[0040] 1. Encapsulation tooling; 11. Support plate; 111. Positioning baffle; 112. First pressing strip; 12. Pressing plate; 121. Second pressing strip; 2. Battery cell; 21. Encapsulation film; 211. PP layer; 212. Non-PP layer; 22. Tab. Detailed implementation manners

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] The encapsulation tooling 1 includes a support plate 11 and a pressing plate 12. In the related art, the encapsulation tooling 1 is used to perform top sealing on the battery cell 2. During top sealing, first, the encapsulation edge of the battery cell 2 is placed on the support plate 11, and the pressing plate 12 moves downward and presses against the encapsulation edge of the battery cell 2. The pressing plate 12 generates heat to complete the pressing of the encapsulation edge. When the length of the encapsulation film 21 outside the electrode group inside the battery cell 2 is certain, the longer the distance that the encapsulation film 21 extends out of the encapsulation tooling 1, the closer the encapsulation tooling 1 is to the electrode group. The smaller the distance that the encapsulation film 21 extends out of the encapsulation tooling 1, the closer the outer end face of the encapsulation tooling 1 is to the end of the encapsulation film 21, and it is easy for the encapsulation film 21 to overflow glue after hot pressing. During the top sealing of the battery cell 2, photo positioning is adopted, but the positioning accuracy of photo positioning is not good, resulting in too small a distance for the encapsulation edge of some battery cells 2 to extend out of the outer end faces of the support plate 11 and the pressing plate 12, and glue overflows after hot pressing. For some battery cells 2, the distance for the encapsulation edge to extend out of the outer end faces of the support plate 11 and the pressing plate 12 is too large, and the encapsulation tooling 1 is likely to press the electrode group inside the battery cell 2, resulting in damage to the connection section between the tab 22 and the electrode group, affecting the appearance and safety of the battery cell 2 and the production efficiency of the battery cell 2.

[0043] As shown Figure 1 in the figure, the battery cell 2 has a long side and a wide side. During heat sealing, the long side of the encapsulation tooling 1 extends along the width direction of the battery cell 2, and the wide side of the encapsulation tooling 1 extends along the length direction of the battery cell 2; the thickness direction of the battery cell 2 is the height direction of the encapsulation tooling 1. During heat sealing, along the width direction of the encapsulation tooling 1, the side of the support plate 11 and the baffle facing away from the battery cell 2 is called the outer end face of the support plate 11 and the baffle, and the side of the support plate and the baffle facing the battery cell 2 is called the inner end face of the support plate 11 and the baffle.

[0044] The following will describe the embodiments of the present invention in conjunction with Figures 1 to 12 the accompanying drawings.

[0045] According to an embodiment of the present invention, on the one hand, an encapsulation tooling 1 is provided, which includes a support plate 11 and a pressing plate 12. Among them, a positioning baffle 111 is provided outside the outer end face in the width direction of the support plate 11. The positioning baffle 111 extends along the height direction of the support plate 11. The positioning baffle 111 is spaced from the outer end face of the support plate 11, and the top surface of the positioning baffle 111 is higher than the top surface of the support plate 11; when heat-sealing the battery cell 2, the end of the encapsulation edge of the battery cell 2 is adapted to abut against the positioning baffle 111; the pressing plate 12 is adapted to be pressed above the support plate 11.

[0046] When the encapsulation tooling 1 with this structure is used, first place the encapsulation edge of the battery cell 2 on the support plate 11. When the end of the encapsulation edge abuts against the positioning baffle 111 above the top surface of the support plate 11, the positioning of the encapsulation edge is realized, and rapid feeding and clamping and high-precision positioning can be achieved. By controlling the distance between the positioning baffle 111 and the outer end face of the support plate 11, the length of the encapsulation edge extending out of the outer end face of the support plate 11 can be controlled, and the extending length of the encapsulation edge can be controlled within a suitable range. When the length of the outer encapsulation film 21 of the electrode group is certain, it can be avoided that the tooling presses against the edge near the encapsulation edge during heat sealing, preventing glue overflow, and ensuring the appearance of the battery cell 2; at the same time, it can also be avoided that the tooling presses into the electrode group inside the battery cell due to the overlong extending distance of the encapsulation edge, avoiding damage to the connection section between the tab 22 and the electrode group, and improving the safety and production efficiency of the battery cell 2.

[0047] As shown Figure 8 in the figure, in some embodiments, the surfaces of the positioning baffle 111 and the support plate 11 facing each other are both vertically extending planes. The positioning baffle 111 is parallel to the outer end face in the width direction of the support plate 11. The distance between the positioning baffle 111 and the outer end face of the support plate 11 is L, and 0.3 mm ≤ L ≤ 30 mm. Such a setting can control the distance between the positioning baffle 111 and the outer end face of the support plate 11 within a suitable range, so that the distance that the encapsulation film 21 extends out of the support plate 11 can be controlled within a proper range, effectively avoiding glue overflow or the tooling pressing against the electrode group, and at the same time avoiding waste of materials and space.

[0048] As shown Figure 12 in the figure, the encapsulation film 21 of the battery cell 2 includes a PP layer 211 and a non-PP layer 212. The thickness of the PP layer 211 is x. The thickness of the PP layer 211 affects the amount of overflow glue. The greater the thickness of the PP layer 211, the greater the amount of overflow glue during heat sealing. The smaller the thickness of the PP layer 211, the smaller the amount of overflow glue during heat sealing. Therefore, there is a correlation between the length of the encapsulation film 21 extending beyond the outer end face of the support plate 11 and the thickness of the PP layer 211. The greater the thickness of the PP layer 211, the greater the extension amount of the encapsulation film 21 is required to prevent overflow glue. Therefore, in some embodiments, when 0.06 mm ≤ 2x ≤ 0.3 mm, L ≥ 0.3 mm. 2x is the total thickness of the PP layer 211 after the two-layer packaging films are butted. When 0.06 mm ≤ 2x ≤ 0.3 mm, the thickness of the PP layer 211 is relatively small at this time, and a relatively small extension length of the encapsulation film 21 beyond the outer end of the support plate 11 can prevent overflow glue. Therefore, at this time, setting the lower limit value of the distance L between the positioning baffle 111 and the outer end face of the support plate 11 to 0.3 mm can avoid overflow glue; when 0.3 mm < 2x ≤ 1.1 mm, the thickness of the PP layer 211 is moderate at this time, and setting the distance L between the positioning baffle 111 and the outer end face of the support plate 11 to satisfy L ≥ 0.5 mm can avoid overflow glue; when 1.1 mm < 2x ≤ 3 mm, the thickness of the PP layer 211 is relatively large at this time, and setting the distance L between the positioning baffle 111 and the outer end face of the support plate 11 to satisfy L ≥ 2 mm can avoid overflow glue. In this way, the lower limit value of L can be determined according to different thicknesses of the PP layer 211, which can effectively prevent overflow glue and avoid material waste at the same time.

[0049] As shown Figure 8 in the figure, in some embodiments, during heat sealing, the height h of the top surface of the positioning baffle 111 above the top surface of the encapsulation film 21. If h is too small, when placing the encapsulation edge of the battery cell 2 on the support plate 11, if the encapsulation edge deforms and warps, it is easy to cross over the positioning baffle 111, and the positioning baffle 111 cannot play a positioning role; if h is too large, it will cause waste of materials and space. Therefore, in some embodiments, the height h of the top surface of the positioning baffle 111 above the top surface of the encapsulation film 21 during heat sealing satisfies 1 mm ≤ h ≤ 50 mm. In this way, the height of the positioning baffle 111 above the encapsulation film 21 can be controlled within a suitable range, which can prevent the encapsulation edge from crossing over the positioning baffle 111 when it deforms and warps, can effectively ensure the positioning effect of the positioning baffle 111, and can avoid waste of materials and space caused by the excessive height of the positioning baffle 111 at the same time.

[0050] As shown Figure 6As shown, in some embodiments, the positioning baffle 111 is in the shape of a rectangular plate. The length of the positioning baffle 111 extending along the length direction of the support plate 11 is L1, where 3 mm ≤ L1 ≤ 200 mm. Such a setting can control the length of the positioning baffle 111 within a suitable range, prevent the positioning baffle 111 from being too short and damaging the encapsulation film 21 when the encapsulation film 21 contacts the positioning baffle 111, and at the same time avoid waste of materials and space due to the positioning baffle 111 being too long, and can also control the weight of the encapsulation tooling 1.

[0051] As Figure 1 , Figure 2 , Figure 6 and Figure 8As shown, in some embodiments, a first pressing strip 112 extending horizontally towards the outer end of the support plate 11 is provided on the outer end face of the support plate 11, and a second pressing strip 121 extending horizontally towards the outer end of the pressing plate 12 is provided on the outer end face of the pressing plate 12; during hot pressing, the first pressing strip 112 and the second pressing strip 121 face each other, and the first pressing strip 112, the second pressing strip 121 and the positioning baffle 111 have an overlapping area in the length direction of the support plate 11. The distance between the top surface of the first pressing strip 112 and the bottom surface of the encapsulation film 21 is g1, and the distance between the bottom surface of the second pressing strip 121 and the top surface of the encapsulation film 21 is g2. During the process of placing the encapsulation edge of the battery cell 2 onto the support plate 11, if the end of the encapsulation film 21 warps up, the first pressing strip 112 and the second pressing strip 121 can flatten the encapsulation film 21. During the hot pressing process, the hot melt adhesive layer of the PP layer 211 of the encapsulation film 21 will flow. If the distance g1 between the top surface of the first pressing strip 112 and the bottom surface of the encapsulation film 21 is too small and / or the distance g2 between the bottom surface of the second pressing strip 121 and the top surface of the encapsulation film 21 is too small, it will result in insufficient space for the molten adhesive layer to flow up and down, so the space for the adhesive layer to flow horizontally will be extended, and the hot pressing time needs to be correspondingly extended, which will affect the encapsulation efficiency. At the same time, it is also necessary to correspondingly extend the length of the encapsulation film 21 extending out of the outer end face of the support plate 11 to avoid glue overflow, which will cause waste of the encapsulation film 21 material and the space of the battery cell 2. If the distance g1 between the top surface of the first pressing strip 112 and the bottom surface of the encapsulation film 21 is too large and / or the distance g2 between the bottom surface of the second pressing strip 121 and the top surface of the encapsulation film 21 is too large, then it is difficult for the first pressing strip 112 and the second pressing strip 121 to effectively flatten the encapsulation film 21 extending out of the support plate 11, and the encapsulation film 21 may be severely deformed and warped. To avoid these problems, in some embodiments, 0.3mm ≤ g1 ≤ 1mm, 0.3mm ≤ g2 ≤ 1mm. Such a setting can control the distance g1 between the top surface of the first pressing strip 112 and the bottom surface of the encapsulation film 21 and the distance g2 between the bottom surface of the second pressing strip 121 and the top surface of the encapsulation film 21 within an appropriate range, can ensure the up and down space for the adhesive layer to flow during heat sealing, without the need to extend the length of the encapsulation film 21 extending out of the support plate 11, and can effectively prevent glue overflow; it can also enable the first pressing strip 112 and the second pressing strip 121 to effectively flatten the encapsulation film 21 in the area of the positioning baffle 111, and can ensure the flatness of the encapsulation film 21.

[0052] As Figure 2 , Figure 6 and Figure 8As shown, in some embodiments, the positioning baffle 111 is provided on the first pressing strip 112. During hot pressing, the distance between the inner wall surface of the positioning baffle 111 and the outer wall surface of the second pressing strip 121 is g3, where 0.2 mm ≤ g3 ≤ 3 mm. The positioning baffle 111 is directly formed on the first pressing strip 112. The first pressing strip 112 not only flattens the encapsulation film 21 but also supports the positioning baffle 111. The positioning baffle 111 is conveniently arranged, which can simplify the support structure of the positioning baffle 111. The top surface of the positioning baffle 111 is not lower than the top surface of the second pressing strip 121. The positioning baffle 111 is located outside the outer end surface of the second pressing strip 121. If the distance g3 between the inner wall surface of the positioning baffle 111 and the outer wall surface of the second pressing strip 121 is too small, there will be a positional interference between the positioning baffle 111 and the second pressing strip 121 due to equipment errors during assembly, and the positioning baffle 111 or the second pressing strip 121 will be worn to generate metal debris. The metal debris entering the battery cell 2 will affect the insulation of the battery cell 2 product. If the distance g3 between the inner wall surface of the positioning baffle 111 and the outer wall surface of the second pressing strip 121 is too large, when the distance between the positioning baffle 111 and the outer end surface of the support plate 11 is fixed, it will cause the distance that the second pressing strip 121 extends out of the pressing plate 12 to be too short, and the second pressing strip 121 cannot effectively flatten the encapsulation film 21. To avoid these problems, 0.2 mm ≤ g3 ≤ 3 mm is satisfied. This can ensure that there is enough distance between the positioning baffle 111 and the second pressing strip 121, avoid interference and wear between the two during assembly to generate metal debris, and ensure the insulation of the battery cell 2. At the same time, it can avoid the distance between the positioning baffle 111 and the second pressing strip 121 being too large and reducing the length that the second pressing strip 121 extends out of the pressing plate 12, ensuring that the first pressing strip 112 can cooperate with the second pressing strip 121 to flatten the encapsulation film 21.

[0053] Due to the positioning and blocking of the positioning baffle 111, the encapsulation film 21 in the area of the positioning baffle 111 may warp and deform. If the lengths L2 of the second pressing strip 121 and L1 of the first pressing strip 112 are too small, the encapsulation film 21 in the area of the positioning baffle 111 cannot be effectively flattened, which will affect the positioning effect of the positioning baffle 111. If the lengths L2 of the second pressing strip 121 and L1 of the first pressing strip 112 are too large, it will waste materials and space and make the encapsulation tooling 1 structure bulky. To avoid these problems, as Figure 6As shown, in some embodiments, the length of the positioning baffle 111 extending along the length direction of the support plate 11 is L1, the length of the second pressing strip 121 extending along the length direction of the support plate 11 is L2, and the length of the first pressing strip 112 extending along the length direction of the support plate 11 is L3. L1 + 3mm ≤ L2 ≤ 200mm; L1 + 3mm ≤ L3 ≤ 200mm. This can make the lengths of the first pressing strip 112 and the second pressing strip 121 adapt to the length of the positioning baffle 111, and make the lengths of the first pressing strip 112 and the second pressing strip 121 greater than the length of the positioning baffle 111, avoiding the lengths of the first pressing strip 112 and the second pressing strip 121 being too small, ensuring that the two pressing strips can effectively flatten the encapsulation film 21 in the area of the positioning baffle 111, and at the same time can avoid waste of materials and space.

[0054] The lengths of both the first pressing strip 112 and the second pressing strip 121 are greater than the length of the positioning baffle 111. In some embodiments, the positioning baffle 111 is centered relative to the first pressing strip 112 and the second pressing strip 121.

[0055] In some alternative embodiments, as Figure 1 and Figure 5 shown, two positioning baffles 111 are provided at intervals on both sides in the length direction of the support plate 11, and a first pressing strip 112 and a second pressing strip 121 are respectively provided on the support plate 11 and the pressing plate 12 in the area corresponding to each positioning baffle 111.

[0056] Design top-sealing toolings with different L, g3, and h, and use encapsulation films with different thicknesses x of the PP layer 211 to manufacture battery cells. Use the encapsulation tooling to heat-seal the battery cells and observe the states of the battery cells. The experimental results are shown in Table 1.

[0057] Table 1

[0058]

[0059] As can be seen from Example 1 and Comparative Example 1, when 0.06 mm ≤ 2x ≤ 0.3 mm and L ≥ 0.3 mm, when the encapsulation tooling is used to thermally seal the battery cell, the state of the battery cell is good and no failure occurs. However, when 0.06 mm ≤ 2x ≤ 0.3 mm and L < 0.3 mm, the encapsulation film 21 can extend out of the outer end of the support plate 11 by a small distance, and the overflow glue space is insufficient. During the hot pressing process of battery cell production, the hot melt glue overflows severely, contaminating the encapsulation tooling. As can be seen from Example 2, when 0.3 mm < 2x ≤ 1.1 mm and L ≥ 0.5 mm, when the encapsulation tooling is used to thermally seal the battery cell, the state of the battery cell is good and no failure occurs. As can be seen from Comparative Example 2, when 0.3 mm < 2x ≤ 1.1 mm and L < 0.5 mm, the encapsulation film 21 can extend out of the outer end of the support plate 11 by a small distance, and the overflow glue space is insufficient. During the hot pressing process of battery cell production, the hot melt glue overflows severely, contaminating the encapsulation tooling. As can be seen from Example 3 and Comparative Example 3, when 1.1 mm < 2x ≤ 3 mm and L ≥ 2 mm, when the encapsulation tooling is used to thermally seal the battery cell, the state of the battery cell is good and no failure occurs. However, when 1.1 mm < 2x ≤ 3 mm and L < 2 mm, the encapsulation film 21 can extend out of the outer end of the support plate 11 by a small distance, and the overflow glue space is insufficient. During the hot pressing process of battery cell production, the hot melt glue overflows severely, contaminating the encapsulation tooling.

[0060] As can be seen from Example 4 and Comparative Example 4, when 1 mm ≤ h ≤ 50 mm, when the encapsulation tooling is used to thermally seal the battery cell, the state of the battery cell is good and no failure occurs. However, when h < 1 mm, the height h of the top surface of the positioning baffle 111 above the top surface of the encapsulation film 21 is too small. During battery cell production, the plastic sealing edge deforms and warps over the positioning baffle 111, the positioning of the positioning baffle 111 fails, the encapsulation tooling is pressed offset during plastic sealing, and the battery cell sealing fails.

[0061] As can be seen from Example 5 and Example 6, when 0.2 mm ≤ g3 ≤ 3 mm, when the encapsulation tooling is used to thermally seal the battery cell, there is no interference wear between the second pressing strip and the positioning baffle. As can be seen from Comparative Example 5, when g3 < 0.2 mm, the distance between the positioning baffle 111 and the second pressing strip 121 is insufficient. During battery cell production, there is interference wear between the second pressing strip and the positioning baffle, generating metal chips. As can be seen from Comparative Example 6, when g3 > 3 mm, the length of the second pressing strip 121 extending out of the pressing plate 12 is reduced, and the second pressing strip 121 cannot effectively flatten the encapsulation film. During battery cell production, the plastic sealing edge deforms and warps severely.

[0062] According to an embodiment of the present invention, on the other hand, a battery cell 2 is further provided, which uses the encapsulation tooling 1 of the above embodiment for encapsulation tooling.

[0063] When the battery cell 2 of this structure is encapsulated, the end of the encapsulation edge abuts against the positioning baffle 111 above the top surface of the support plate 11 to achieve the positioning of the encapsulation edge, which can realize rapid loading and clamping and high-precision positioning. By controlling the distance between the positioning baffle 111 and the outer end surface of the support plate 11, the length of the encapsulation edge extending out of the outer end surface of the support plate 11 can be controlled, and the extending length of the encapsulation edge can be controlled within a suitable range, which can avoid the tooling edge being pressed against the edge near the encapsulation edge during heat sealing, prevent glue overflow, and ensure the appearance of the battery cell 2; at the same time, it can also avoid the tooling pressing against the electrode group inside the battery cell 2 due to the overlong extending distance of the encapsulation edge, avoid damaging the connection section between the tab 22 and the electrode group, and can improve the safety and production efficiency of the battery cell 2.

[0064] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, which includes the battery cell 2 of the above embodiment.

[0065] For the battery pack of this structure, when the battery cell 2 inside it is heat-sealed, the end of the encapsulation edge is positioned by the positioning baffle 111, which can realize rapid loading and clamping and high-precision positioning. At the same time, the extending length of the encapsulation edge can be controlled within a suitable range, which can avoid the tooling edge being pressed against the edge near the encapsulation edge during heat sealing, prevent glue overflow, and ensure the appearance of the battery cell 2; at the same time, it can also avoid the tooling pressing against the electrode group inside the battery cell 2 due to the overlong extending distance of the encapsulation edge, avoid damaging the connection section between the tab 22 and the electrode group, and can improve the safety and production efficiency of the battery cell 2 and the battery pack.

[0066] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A packaging tool, characterized in that: include: The support plate has a positioning baffle on the outer end surface in the width direction, the positioning baffle extends in the height direction of the support plate, the positioning baffle is spaced apart from the outer end surface of the support plate, and the top surface of the positioning baffle is higher than the top surface of the support plate; when heat-sealing the battery cell, the end of the battery cell packaging edge is suitable for abutting against the positioning baffle; A pressing plate is suitable for being pressed onto the supporting plate.

2. The packaging tool according to claim 1, characterized in that: The positioning baffle is parallel to the outer end surface of the support plate in the width direction, and the distance between the positioning baffle and the outer end surface of the support plate is L, 0.3mm≤L≤30mm.

3. The packaging tool according to claim 2, characterized in that: The packaging film of the battery cell includes a PP layer, the thickness of the PP layer is x, when 0.06mm≤2x≤0.3mm, L≥0.3mm; when 0.3mm<2x≤1.1mm, L≥0.5mm; when 1.1mm<2x≤3mm, L≥2mm.

4. The packaging tool according to any one of claims 1 to 3, characterized in that: During heat sealing, the height of the top surface of the positioning baffle above the top surface of the packaging film is h, 1mm≤h≤50mm.

5. The packaging tool according to any one of claims 1 to 3, characterized in that: The length of the positioning baffle extending along the length direction of the support plate is L1, 3mm≤L1≤200mm.

6. The packaging tool according to claim 2 or 3, characterized in that: A first pressure strip extending horizontally toward the outer end of the support plate is provided on the outer end surface of the support plate, and a second pressure strip extending horizontally toward the outer end of the pressure plate is provided on the outer end surface of the pressure plate; during hot pressing, the first pressure strip is opposite to the second pressure strip, and the first pressure strip, the second pressure strip and the positioning baffle have an overlapping area in the length direction of the support plate, the distance between the top surface of the first pressure strip and the bottom surface of the packaging film is g1, the distance between the bottom surface of the second pressure strip and the top surface of the packaging film is g2, 0.3mm≤g1≤1mm, 0.3mm≤g2≤1mm.

7. The packaging tool according to claim 6, characterized in that: The positioning baffle is arranged on the first pressure strip. During hot pressing, the distance between the inner wall surface of the positioning baffle and the outer wall surface of the second pressure strip is g3, 0.2mm≤g3≤3mm.

8. The packaging tool according to claim 6, characterized in that: The length of the positioning baffle extending along the length direction of the support plate is L1, the length of the second pressure strip extending along the length direction of the support plate is L2, and the length of the first pressure strip extending along the length direction of the support plate is L3, L1+3mm≤L2≤200mm; L1+3mm≤L3≤200mm.

9. A battery cell, characterized in that: The packaging tool is packaged using the packaging tool described in any one of claims 1 to 8.

10. A battery pack, characterized in that: Comprising the battery cell as claimed in claim 9.

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