Aluminum plastic film and battery

Abstract

The utility model discloses a battery. The battery comprises a battery core assembly and an aluminum plastic film, the aluminum plastic film is provided with two accommodating grooves, the accommodating grooves are used for assembling battery cell components, the two accommodating grooves are symmetric about a symmetric axis and are arranged at intervals, each accommodating groove comprises a first end and a second end which are oppositely arranged, the first end is closer to the symmetric axis relative to the second end, and the depths of the accommodating grooves are gradually increased from the first end to the second end; the depth of the first end is smaller than that of the second end, and the battery cell assembly is assembled in the containing groove of the aluminum plastic film. The aluminum-plastic film can improve the fitting degree of the aluminum-plastic film and the battery cell so as to improve the packaging quality.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a kind of aluminium plastic film and battery. BACKGROUND

[0002] In the field of battery cell packaging, as one of the important packaging materials, the main function of aluminum plastic film is to protect the battery cell from the external environment and ensure the stability of the internal electrolyte. Under normal circumstances, the aluminum plastic film is symmetrically provided with two accommodating grooves, and the accommodating grooves are used to place the battery cell. After the battery cell is placed in the accommodating groove, the aluminum plastic film needs to go through multiple steps such as folding, aligning and heat sealing to package the battery cell. However, the part of the aluminum plastic film between the accommodating grooves will be stacked after packaging, thereby forming a gap between the aluminum plastic film and the battery cell, which affects the packaging quality. SUMMARY

[0003] One purpose of the utility model is to provide an aluminum plastic film and a battery, which aims to improve the adhesion of the aluminum plastic film and the battery cell to improve the packaging quality.

[0004] In the first aspect, to achieve the above-mentioned purpose, the utility model provides a kind of aluminum plastic film, it is characterized by comprising: aluminum plastic film is provided with two accommodating grooves, accommodating groove is used to assemble battery cell assembly, two accommodating grooves are symmetric about symmetry axis and interval arrangement, accommodating groove includes oppositely arranged first end and second end, first end is closer to symmetry axis relative to second end, the depth of first end is less than the depth of second end.

[0005] Optionally, the depth of the first end is D1, the depth of the second end is D2, the distance between the two accommodating grooves is D3, and (D2-D1) / D3=1 / 2.

[0006] Optionally, 1mm≤D1≤4mm.

[0007] Optionally, 1mm≤D3≤3mm.

[0008] Optionally, the angle between the bottom wall of the accommodating groove and the plane of the aluminum plastic film is A, and 0°<A≤5°.

[0009] Optionally, the depth of the accommodating groove gradually increases from the first end to the second end.

[0010] Optionally, the aluminum plastic film is provided with a liquid injection channel, the liquid injection channel and the accommodating groove are located on the same side and are spaced apart, and the end of the liquid injection channel away from the accommodating groove is in communication with the edge of the aluminum plastic film.

[0011] Optionally, the aluminum plastic film is provided with a gas collection groove, and the gas collection groove is in communication with the liquid injection channel.

[0012] Optionally, the aluminum-plastic film is provided with a first limiting groove and a second limiting groove. The opening directions of the first limiting groove and the second limiting groove are opposite, and both protrude along the thickness direction of the aluminum-plastic film. After the aluminum-plastic film is folded about the axis of symmetry, the first limiting groove and the second limiting groove are engaged together.

[0013] Secondly, in order to achieve the above objectives, the present invention provides a battery comprising a cell assembly and an aluminum-plastic film as described in any of the first aspects, wherein the cell assembly is assembled in a receiving groove of the aluminum-plastic film.

[0014] The beneficial effects of this utility model are as follows:

[0015] The aluminum-plastic film has two receiving slots for assembling battery cell components. The two receiving slots are symmetrical about the axis of symmetry and are spaced apart. Each receiving slot includes a first end and a second end that are positioned opposite each other. The first end is closer to the axis of symmetry than the second end. From the first end to the second end, the depth of the receiving slot gradually increases, so that the depth of the first end is less than the depth of the second end. The battery cell components are assembled in the receiving slots of the aluminum-plastic film.

[0016] In practical applications, two symmetrically arranged and spaced-apart receiving slots are set on the aluminum-plastic film. The battery cell assembly is placed in one of the receiving slots. During the encapsulation process, the aluminum-plastic film is folded along the axis of symmetry, causing the aluminum-plastic films on both sides of the axis of symmetry to adhere to each other, thereby connecting the two receiving slots and forming a sealed space. This structural design allows the aluminum-plastic film area between the two receiving slots and the sidewall of the receiving slot near the first end to fit tightly against the battery cell assembly. This effectively reduces the possibility of the aluminum-plastic film lifting in the first end area and the formation of gaps between the aluminum-plastic film and the battery cell assembly, significantly improving the compatibility and fit between the aluminum-plastic film and the battery cell assembly, and thus improving the encapsulation quality and structural reliability of the battery cell.

[0017] Furthermore, the depth of the first end is less than the depth of the second end, which reduces the overall molding depth and area of ​​the receiving groove on the side of the first end near the axis of symmetry while ensuring the bonding performance. This reduces the stretching requirement of the aluminum-plastic film, effectively improves the strength of the aluminum-plastic film in this part, and reduces the risk of insufficient material strength and breakage due to excessive stretching of the aluminum-plastic film, further enhancing the structural stability and safety of the packaging system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram illustrating the structure of the aluminum-plastic film provided in this embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram illustrating the structure of the aluminum-plastic film provided in this embodiment of the utility model;

[0021] Figure 3 This is a structural schematic diagram provided by an embodiment of the present invention to illustrate the injection channel, the receiving tank, and the gas collecting tank;

[0022] Figure 4 This is a structural schematic diagram provided by an embodiment of the present invention to illustrate the first limiting groove and the second limiting groove.

[0023] Explanation of icon numbers:

[0024] 20. Aluminum-plastic film; 21. Axis of symmetry; 22. Receiving tank; 221. First end; 222. Second end; 23. Injection channel; 24. Gas collection tank; 25. First limiting groove; 26. Second limiting groove;

[0025] 30. First direction;

[0026] 40. Second direction. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1 and Figure 2 As shown, Figure 1 This is an exploded structural diagram of the battery pack provided in an embodiment of the present invention; Figure 2 This is a front view of the battery pack provided in an embodiment of the present utility model; Figure 3 This is a partial structural schematic diagram of the anti-slip structure provided in an embodiment of the present invention; Figure 4 This is provided by the embodiment of the present utility model. Figure 2 Schematic diagram of the cross-sectional structure at point BB.

[0029] This utility model provides a battery, which includes a cell assembly and an aluminum-plastic film 20.

[0030] Specifically, the aluminum-plastic film 20 has two receiving grooves 22 for assembling battery cell components. The two receiving grooves 22 are symmetrical about the axis of symmetry 21 and are spaced apart. The receiving groove 22 includes a first end 221 and a second end 222 that are arranged opposite to each other. The first end 221 is closer to the axis of symmetry 21 than the second end 222. From the first end 221 to the second end 222, the depth of the receiving groove 22 gradually increases, so that the depth of the first end 221 is less than the depth of the second end 222. The battery cell components are assembled in the receiving grooves 22 of the aluminum-plastic film 20.

[0031] In practical applications, two symmetrically arranged and spaced-apart receiving slots 22 are set on the aluminum-plastic film 20 about the axis of symmetry 21. The battery cell assembly is placed in one of the receiving slots 22. During the encapsulation process, the aluminum-plastic film 20 is folded along the axis of symmetry 21, so that the aluminum-plastic films 20 on both sides of the axis of symmetry 21 are bonded to each other, thereby connecting the two receiving slots 22 and forming a sealed space. This structural design allows the aluminum-plastic film 20 area between the two receiving slots 22 and the sidewall of the receiving slot 22 near the first end 221 to be tightly bonded to the battery cell assembly. This effectively reduces the possibility of the aluminum-plastic film 20 in the first end 221 area lifting and forming gaps between the aluminum-plastic film 20 and the battery cell assembly, significantly improving the compatibility and bonding between the aluminum-plastic film 20 and the battery cell assembly, thereby improving the encapsulation quality and structural reliability of the battery cell.

[0032] Furthermore, the depth of the first end 221 is less than the depth of the second end 222, which means that the receiving groove 22 on the side of the first end 221 near the axis of symmetry 21 can reduce the overall molding depth and area of ​​the receiving groove 22 while ensuring the bonding performance. This reduces the stretching requirement of the aluminum-plastic film 20, effectively improves the strength of the aluminum-plastic film 20 in this part, reduces the risk of insufficient material strength and breakage due to excessive stretching of the aluminum-plastic film 20, and further enhances the structural stability and safety of the packaging system.

[0033] In this embodiment, by setting the depth of the first end 221 to D1, the depth of the second end 222 to D2, and the distance between the two receiving grooves 22 to D3, and satisfying the relationship (D2 - D1) / D3 = 1 / 2, this application further optimizes the spatial fit of the aluminum-plastic film 20 structure. Specifically, this design makes the distance between the two receiving grooves 22 equal to twice the depth difference between the second end 222 and the first end 221. Thus, when the aluminum-plastic film 20 is folded along the axis of symmetry 21, making the two receiving grooves 22 interconnected and forming a sealed space, the area of ​​the aluminum-plastic film 20 in the middle of the two receiving grooves 22 can accurately compensate for the spatial offset caused by the depth difference between the first end 221 and the second end 222.

[0034] Therefore, when the aluminum-plastic film 20 between the two receiving slots 22 and the sidewall of the receiving slot 22 near the first end 221 are bonded to the battery cell assembly, no additional stretching or local deformation is required to achieve a smooth bonding of the aluminum-plastic film 20 on both sides of the axis of symmetry 21. This structure effectively avoids the risk of warping, wrinkling, or cracking caused by excessive local stress in the aluminum-plastic film 20, improving the compatibility and bonding degree between the aluminum-plastic film 20 and the battery cell assembly, thereby enhancing the packaging quality and reliability of the battery cell assembly. At the same time, by setting this proportional relationship, the overall stability of the aluminum-plastic film 20 structure can be further enhanced, reducing the assembly difficulty in the production process and ensuring stable and reliable product performance.

[0035] In one embodiment, see Figure 2 The depth of the first end 221 is D1, the depth of the second end 222 is D2, the distance between the two receiving grooves 22 is D3, and (D2-D1) / D3=1 / 2.

[0036] In practical applications, by setting the depth of the first end 221 to D1, the depth of the second end 222 to D2, and the distance between the two receiving slots 22 to D3, and satisfying the relationship (D2 - D1) / D3 = 1 / 2, the spatial fit of the aluminum-plastic film 20 structure is further optimized. Specifically, this design makes the distance between the two receiving slots 22 equal to twice the depth difference between the second end 222 and the first end 221. In this way, when the aluminum-plastic film 20 is folded along the axis of symmetry 21, making the two receiving slots 22 interconnected and forming a sealed space, the area of ​​the aluminum-plastic film 20 in the middle of the two receiving slots 22 can accurately compensate for the spatial offset caused by the depth difference between the first end 221 and the second end 222.

[0037] Therefore, when the aluminum-plastic film 20 between the two receiving slots 22 and the sidewall of the receiving slot 22 near the first end 221 are bonded to the battery cell assembly, no additional stretching or local deformation is required to achieve a smooth bonding of the aluminum-plastic film 20 on both sides of the axis of symmetry 21. This structure effectively avoids the risk of warping, wrinkling, or cracking caused by excessive local stress in the aluminum-plastic film 20, improving the compatibility and bonding degree between the aluminum-plastic film 20 and the battery cell assembly, thereby enhancing the packaging quality and reliability of the battery cell assembly. At the same time, by setting this proportional relationship, the overall stability of the aluminum-plastic film 20 structure can be further enhanced, reducing the assembly difficulty in the production process and ensuring stable and reliable product performance.

[0038] Further, see Figure 2 , 1mm≤D1≤4mm, 1mm≤D3≤3mm.

[0039] In practical applications, by setting the depth of the first end 221 between 1mm and 4mm, and the spacing between the two receiving grooves 22 between 1mm and 3mm, this application further optimizes the structural stability and encapsulation effect of the aluminum-plastic film 20. Specifically, this depth range ensures that the aluminum-plastic film 20 has sufficient strength and flexibility during processing and use, preventing damage caused by excessive deformation or stress concentration. Furthermore, this depth range accommodates the dimensions of most battery cell components, thereby improving the fit between the aluminum-plastic film 20 and the battery cell component, enhancing the sealing and reliability of the encapsulation, while reducing processing difficulty and cost during production, thus significantly improving production efficiency and product quality.

[0040] In one embodiment, see Figure 2 The angle between the bottom wall of the receiving groove 22 and the plane where the aluminum-plastic film 20 is located is A, where 0° < A ≤ 5°.

[0041] In practical applications, by setting the angle between the bottom wall of the receiving groove 22 and the plane containing the aluminum-plastic film 20 to 0° < A ≤ 5°, this application further optimizes the sealing performance and structural strength of the aluminum-plastic film 20. Specifically, this angle range ensures a tighter contact between the receiving groove 22 and the aluminum-plastic film 20, improving sealing performance and reducing the risk of air or impurities seeping in. Furthermore, the appropriate angle design helps to disperse stress, reducing the risk of film material damage due to localized stress concentration and improving the structural strength of the aluminum-plastic film 20. Simultaneously, this angle setting also improves the operability of the aluminum-plastic film 20 during assembly, increasing production efficiency and assembly accuracy. More importantly, with the angle A within the range, the depth difference between the first end 221 and the second end 222 is effectively constrained, avoiding stress concentration and material deformation caused by excessive depth differences, ensuring the stability and reliability of the aluminum-plastic film 20.

[0042] The negative example further illustrates that if the included angle exceeds 5°, the depth difference may be too large, resulting in an excessively large distance between the two receiving grooves 22. Consequently, when folding the aluminum-plastic film 20 along the axis of symmetry 21, the receiving grooves 22 may not align easily. Conversely, if the included angle is less than 0°, the depth of the first end 221 may be greater than that of the second end 222, affecting the structural strength and stability. This highlights the rationality and necessity of the design of this invention.

[0043] In one embodiment, reference is made to Figure 3 and Figure 4 The aluminum-plastic film 20 has an injection channel 23. The injection channel 23 and the receiving tank 22 are located on the same side and are spaced apart from each other. The end of the injection channel 23 away from the receiving tank 22 is connected to the edge of the aluminum-plastic film 20.

[0044] In practical applications, during the encapsulation process of battery cells, traditional methods require operators to manually open the heat-sealed aluminum-plastic film 20 when injecting electrolyte. This process is cumbersome and affects production efficiency. To solve this problem, this invention designs an injection channel 23 on the aluminum-plastic film 20, greatly simplifying the operation. Through this injection channel 23, operators no longer need to manually open the opening of the aluminum-plastic film 20; they can directly inject electrolyte into the receiving tank 22 through the injection channel 23. This innovation makes the operation process simpler, reduces the complexity of manual operation, shortens the electrolyte injection time, and improves the overall efficiency of the production line. In addition, the simplified operation steps reduce the requirements for operator skills, reducing training and labor costs. The injection channel 23 and the receiving tank 22 are spaced apart, leaving space for heat sealing around the perimeter of the receiving tank 22. In summary, this invention, by setting an injection channel 23 on the aluminum-plastic film 20, successfully simplifies the electrolyte injection process, improves production efficiency, reduces costs, and improves product quality and reliability.

[0045] Furthermore, referring to Figure 3 and Figure 4 The aluminum-plastic film 20 has a gas collection groove 24, which is connected to the liquid injection channel 23.

[0046] In practical applications, by connecting the injection channel 23 to the gas collection tank 24, more complete exhaust gas discharge is achieved, significantly improving the encapsulation effect and overall quality of the battery cell assembly. Specifically, after the electrolyte is injected into the receiving tank 22, an initial heat seal is performed along the edge of the aluminum-plastic film 20 to ensure a full reaction between the electrolyte and the battery cell assembly. Exhaust gas generated during the reaction is rapidly discharged to the gas collection tank 24 through the injection channel 23, greatly reducing residual exhaust gas in the receiving tank 22. After the exhaust gas is fully discharged, a second heat seal is performed, i.e., the aluminum-plastic film 20 around the receiving tank 22 is heat-sealed again. Since the exhaust gas has been effectively removed, the sealing and reliability of the encapsulation are significantly improved, ensuring the stability of the environment within the receiving tank 22. Through this design, the battery cell assembly is more tightly encapsulated, reducing the impact of the external environment and thus improving product quality and lifespan. Compared to traditional technologies, where the gas collecting groove 24 is directly connected to the receiving groove 22, even after the second heat sealing, some waste gas may still remain in the receiving groove 22, resulting in insufficient sealing and affecting the overall quality and long-term performance of the battery cell assembly. This technical solution, by optimizing the waste gas discharge path, ensures the integrity of the sealing, effectively improving the quality and reliability of the battery cell assembly and meeting higher application standards.

[0047] In this embodiment, the gas collecting groove 24 extends along the length of the injection channel 23. In other embodiments of this application, the gas collecting groove 24 may also extend along the length of the injection channel 23 perpendicular to it, or extend at an angle to the length of the injection channel 23.

[0048] Optionally, refer to Figure 3 and Figure 4 The aluminum-plastic film 20 has a first limiting groove 25 and a second limiting groove 26. The opening direction of the first limiting groove 25 is opposite to that of the second limiting groove 26, and both protrude along the thickness direction of the aluminum-plastic film 20. When the aluminum-plastic film 20 is folded about the axis of symmetry 21, the first limiting groove 25 and the second limiting groove 26 fit together.

[0049] For ease of understanding, the first direction 30 represents the opening direction of the first limiting groove 25, and the second direction 40 represents the opening direction of the second limiting groove 26. Both the first direction 30 and the second direction 40 are perpendicular to the plane where the aluminum-plastic film 20 is located, and are set perpendicular to each other.

[0050] In practical applications, when the aluminum-plastic film 20 is folded along the axis of symmetry 21, the first limiting groove 25 and the second limiting groove 26 can cooperate to form a self-locking structure. This design not only enhances the stability and alignment accuracy of the aluminum-plastic film 20 during the packaging process, but also provides a more robust sealing effect after packaging. The cooperation of the limiting grooves allows the aluminum-plastic film 20 to be more tightly bound together after folding, thereby effectively preventing misalignment or slippage that may occur during the packaging process and improving the reliability of the packaging.

[0051] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0052] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0053] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0054] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An aluminum-plastic film, characterized in that, include: The aluminum-plastic film has two receiving slots for assembling battery cell components. The two receiving slots are symmetrical about an axis of symmetry and are spaced apart. Each receiving slot includes a first end and a second end that are opposite to each other. The first end is closer to the axis of symmetry than the second end, and the depth of the first end is less than the depth of the second end.

2. The aluminum-plastic film according to claim 1, characterized in that, The depth of the first end is D1, the depth of the second end is D2, the distance between the two receiving grooves is D3, and (D2-D1) / D3 = 1 / 2.

3. The aluminum-plastic film according to claim 2, characterized in that, 1mm≤D1≤4mm.

4. The aluminum-plastic film according to claim 2, characterized in that, 1mm≤D3≤3mm.

5. The aluminum-plastic film according to claim 1, characterized in that, The angle between the bottom wall of the receiving groove and the plane where the aluminum-plastic film is located is A, where 0° < A ≤ 5°.

6. The aluminum-plastic film according to claim 1, characterized in that, The depth of the receiving groove gradually increases from the first end to the second end.

7. The aluminum-plastic film according to any one of claims 1 to 6, characterized in that, The aluminum-plastic film has an injection channel, which is located on the same side as the receiving tank and is spaced apart from the receiving tank. The end of the injection channel away from the receiving tank is connected to the edge of the aluminum-plastic film.

8. The aluminum-plastic film according to claim 7, characterized in that, The aluminum-plastic film has a gas collection groove, which is connected to the liquid injection channel.

9. The aluminum-plastic film according to claim 7, characterized in that, The aluminum-plastic film has a first limiting groove and a second limiting groove. The opening direction of the first limiting groove is opposite to that of the second limiting groove, and both protrude along the thickness direction of the aluminum-plastic film. Wherein, after the aluminum-plastic film is folded about the axis of symmetry, the first limiting groove and the second limiting groove are engaged together.

10. A battery, characterized in that, The battery includes a cell assembly and an aluminum-plastic film as described in any one of claims 1 to 9, wherein the cell assembly is assembled in a receiving groove of the aluminum-plastic film.

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