Insulating film, matching structure of insulating film and positioning tooling, and battery cell

Abstract

This invention relates to the field of battery technology, disclosing an insulating film, a mating structure between the insulating film and a positioning fixture, and a battery cell. The insulating film includes a first film region having a first side and a second side disposed opposite to each other along the X direction. At least one set of positioning holes is formed on the first film region. Each set of positioning holes includes two positioning holes spaced apart along the X direction, one of which is positioned near the first side and the other near the second side. Each set of positioning holes includes a first positioning hole and a second positioning hole. The opening size of the second positioning hole along the X direction is larger than that of the first positioning hole along the X direction, and the opening size of the second positioning hole along the X direction is larger than its opening size along the Y direction. This provides an insulating film with good positioning effect and high compatibility with positioning fixtures.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to an insulating film, a mating structure between the insulating film and a positioning fixture, and a battery cell. Background Technology

[0002] A battery cell includes a casing, a cover assembly, and electrode assemblies, with the electrode assemblies placed within a sealed space formed by the casing and cover assembly. Inside the cell, there is also an insulating film and a base plate. The insulating film wraps around the outside of the electrode assemblies to ensure insulation between the electrode assemblies and the casing, and the base plate is positioned between the insulating film-wrapped electrode assemblies and the casing. However, existing insulating films often lack positioning structures, resulting in poor positioning and making it difficult to assemble and position the insulating film and base plate. After the insulating film is wrapped around the electrode assemblies, misalignment and skewness are prone to occur, hindering cell assembly. Summary of the Invention

[0003] In view of this, the present invention provides an insulating film, a mating structure of the insulating film and a positioning fixture, and a battery cell to solve the problem of poor positioning effect of the insulating film.

[0004] In a first aspect, the present invention provides an insulating film, comprising: a first film region having a first side and a second side disposed opposite to each other along the X direction; at least one set of positioning holes is formed on the first film region, each set of positioning holes comprising two positioning holes spaced apart along the X direction, one of the two positioning holes being disposed near the first side and the other near the second side; each set of positioning holes comprising a first positioning hole and a second positioning hole, the opening size of the second positioning hole along the X direction being larger than the opening size of the first positioning hole along the X direction, and the opening size of the second positioning hole along the X direction being larger than its opening size along the Y direction.

[0005] Beneficial effects: By setting at least one set of positioning holes on the first membrane area, and each set of positioning holes including two positioning holes spaced apart along the X direction, the insulating film can be positioned through the two positioning holes, thereby ensuring the positioning effect and positional stability of the insulating film during the assembly process, reducing assembly errors or processing deviations caused by inaccurate positioning, and avoiding misalignment or skew after the insulating film is wrapped on the electrode group. Furthermore, since each set of positioning holes includes a first positioning hole with a relatively small opening size along the X direction and a second positioning hole with a larger opening size along the X direction, the first positioning hole can accurately cooperate with the positioning pin on the positioning fixture. The second positioning hole, while providing positioning function, also has a certain adjustment space along the X direction, allowing the positioning pin on the positioning fixture that cooperates with the second positioning hole to have a certain deviation in the X direction. This can accommodate the positioning deviation of the positioning fixture, improve the adaptability of the insulating film, and thus provide an insulating film with good positioning effect and high positioning compatibility with the positioning fixture. This facilitates the subsequent assembly of the insulating film with other components and helps to improve the assembly accuracy and efficiency of the battery cell.

[0006] In one optional embodiment, the second positioning hole has a dimension of L along the X direction and a dimension of W along the Y direction, wherein L and W satisfy the relationship: W+1.0 mm≤L≤W+7.5 mm;

[0007] And / or, the dimension of the first positioning hole along the X direction is equal to its dimension along the Y direction.

[0008] Beneficial effects: By limiting the difference between L and W to a range of 1.0 mm to 7.5 mm, it can be ensured that the second positioning hole has sufficient adjustable space in the X direction to accommodate the positioning deviation of the positioning fixture, and the insulation problem caused by the second positioning hole being too large can be avoided.

[0009] And / or, the dimension of the first positioning hole along the X direction is equal to its dimension along the Y direction, which facilitates the machining of the first positioning hole and makes the fitting clearance between the first positioning hole and the positioning pin equal along the X and Y directions, thereby improving the fitting accuracy between the first positioning hole and the positioning pin.

[0010] In one optional embodiment, the dimension W of the second positioning hole along the Y direction is in the range of 2.5 mm ≤ W ≤ 9.5 mm;

[0011] And / or, the dimension of the first positioning hole along the X direction and / or Y direction is D, wherein the value of D is in the range of 2.5mm≤D≤9.5mm.

[0012] Beneficial effects: By limiting W to a value within the range of 2.5 mm to 9.5 mm, it can be ensured that the second positioning hole can smoothly cooperate with the positioning pin, thereby ensuring the positioning accuracy of the insulating film, and the probability of poor insulation between the shell and the electrode group can be reduced, thereby improving safety.

[0013] And / or, by limiting D to a value within the range of 2.5 mm to 9.5 mm, it can be ensured that the first positioning hole can smoothly cooperate with the positioning pin, thereby ensuring the positioning accuracy of the insulating film, and the probability of poor insulation between the housing and the electrode group can be reduced, thereby improving safety.

[0014] In one optional embodiment, the number of the positioning hole groups is one group, and the positioning holes are centrally located along the Y direction on the first membrane region.

[0015] Beneficial effects: Facilitates the layout and processing of positioning holes, and helps improve processing accuracy and quality.

[0016] In one optional embodiment, the number of positioning hole groups is multiple, and the multiple groups of positioning hole groups are spaced apart along the Y direction;

[0017] The plurality of positioning holes disposed near the first side are all the first positioning holes, and the plurality of positioning holes disposed near the second side are all the second positioning holes; or, the plurality of positioning holes disposed near the first side includes at least one first positioning hole and one second positioning hole, and the plurality of positioning holes disposed near the second side includes at least one second positioning hole and one first positioning hole.

[0018] Beneficial effects: By setting multiple sets of positioning holes, the number of positioning points for the insulating film is increased, which further improves the positioning effect of the insulating film, ensures the stability of the insulating film on the positioning fixture, further avoids the deflection of the insulating film, ensures positioning accuracy, and by setting multiple positioning holes with the same shape close to the same side, it is convenient to process the positioning holes and to cooperate with the insulating film and the positioning fixture.

[0019] Alternatively, by setting multiple positioning holes near the first or second side, including both a first positioning hole with a smaller size in the X direction and a second positioning hole with a larger size in the X direction, either end of the insulating film in the X direction can achieve an adjustable function in the X direction based on the positioning function, thereby further improving the positioning effect of the insulating film and its compatibility with positioning fixtures.

[0020] In one optional embodiment, the distance between two adjacent sets of positioning holes along the Y direction is E, wherein the value of E ranges from 5 mm to 45 mm.

[0021] Beneficial effects: It can avoid breakage damage in the area between two adjacent sets of positioning holes, and also avoid damage in the area between the positioning holes and the edge of the insulating film, thereby ensuring the structural strength of the insulating film and its insulation performance.

[0022] In one optional embodiment, the first positioning hole is a round hole, and the second positioning hole is an oblong hole;

[0023] And / or, along the X direction, the distance between the positioning hole located near the first side and the first side is A, wherein the value of A ranges from 4.5 mm to A to 35 mm.

[0024] And / or, along the X direction, the distance between the positioning hole located near the second side and the second side is B, wherein the value of B is in the range of: 4.5 mm ≤ B ≤ 35 mm;

[0025] And / or, a plurality of tangents are also provided on the first membrane region, the tangents penetrate the first membrane region along the Z direction, the positioning holes are spaced apart from the tangents along the Y direction, and the distance between the positioning holes and the tangents along the Y direction is F, wherein the value of F is in the range of 5 mm ≤ F ≤ 30 mm.

[0026] Beneficial effects: The round and oblong holes have simple structures, are easy to process and form, and have smooth transitions in the hole walls, which helps to reduce damage to the insulating film and facilitates cooperation with the positioning pins, thus improving positioning accuracy;

[0027] And / or, limiting A to a value between 4.5 mm and 35 mm can ensure the structural strength of the edge of the first membrane area near the first side, avoiding cracking and tearing, and also ensure that the distance between the two positioning holes in the same positioning hole group is appropriate, so that the dual positioning holes can provide a good positioning effect, avoid the positioning problem of the insulating film being deflected or skewed, and ensure the positioning effect of the insulating film.

[0028] And / or, by limiting B to a value between 4.5 mm and 35 mm, the structural strength of the edge of the first membrane area near the second side can be guaranteed, avoiding cracking and tearing. At the same time, the distance between the two positioning holes in the same positioning hole group can be moderate, so that the dual positioning holes can provide a good positioning effect, avoid the positioning problem of the insulating film being deflected or skewed, and ensure the positioning effect of the insulating film.

[0029] And / or, by limiting F to a value between 5 mm and 30 mm, the structural strength of the insulating film can be guaranteed, thus ensuring insulation, while also ensuring that the electrolyte can pass smoothly through the tangent and wet the electrode assembly, thereby improving the wettability of the electrode assembly.

[0030] Secondly, the present invention also provides a mating structure for an insulating film and a positioning fixture, comprising: a positioning fixture including a fixture body and positioning pins fixedly connected to the fixture body, wherein the number of positioning pins is equal to the number of positioning holes and corresponds one-to-one; and the aforementioned insulating film, wherein the positioning holes on the insulating film are adapted to mate with the positioning pins. Since the mating structure of the insulating film and the positioning fixture includes the insulating film and has the same effect as the insulating film, it will not be described in detail here.

[0031] In one optional implementation, the diameter of the positioning pin is d;

[0032] The dimension D of the first positioning hole along the X and / or Y directions and the diameter d of the positioning pin satisfy the following relationship: 0.5 mm ≤ Dd ≤ 2.0 mm;

[0033] And / or, the dimension W of the second positioning hole along the Y direction and the diameter d of the positioning pin satisfy the following relationship: 0.5 mm ≤ Wd ≤ 2.0 mm;

[0034] And / or, the range of values ​​for d is: 2.0 mm ≤ d ≤ 7.5 mm.

[0035] Beneficial effects: By limiting the fit gap between the first positioning hole and the positioning pin to a range of 0.5 mm to 2.0 mm, it is possible to ensure that the positioning pin can be smoothly inserted into the positioning hole, while avoiding large displacement of the insulating film relative to the positioning fixture in the XY plane, thus ensuring positioning accuracy. This allows the positioning fixture to fix the insulating film in place, preventing large-scale deflection of the insulating film. This further ensures the accuracy of the subsequent assembly and positioning between the base plate and the insulating film, guaranteeing the positioning effect and preventing deflection or skew after the insulating film is wrapped around the electrode assembly. This also facilitates the thermal fusion connection between the insulating film and the insulating components in the cover plate assembly, ensuring the subsequent cell assembly accuracy.

[0036] By limiting the mating clearance between the second positioning hole and the positioning pin in the Y direction to a range of 0.5 mm to 2.0 mm, it is possible to ensure that the positioning pin can be smoothly inserted into the second positioning hole, while also preventing the insulating film from undergoing large displacement relative to the positioning fixture in the XY plane, thus ensuring positioning accuracy.

[0037] Thirdly, the present invention also provides a battery cell, comprising: a housing; an electrode assembly disposed within the inner cavity of the housing; and the aforementioned insulating film, the insulating film wrapping around the outside of the electrode assembly. Since the battery cell includes an insulating film and has the same effects as the insulating film, it will not be described further here. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of the first insulating film according to an embodiment of the present invention;

[0040] Figure 2 for Figure 1 A magnified view of a portion of G;

[0041] Figure 3 This is a schematic diagram of the structure of the second type of insulating film according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the structure of the third type of insulating film according to an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the structure of the mating structure of an insulating film and a positioning tool according to an embodiment of the present invention;

[0044] Figure 6 for Figure 5 A top view of the mating structure between the insulating film and the positioning fixture;

[0045] Figure 7 for Figure 6 A magnified view of part of H;

[0046] Figure 8 for Figure 6 A magnified view of part of J;

[0047] Figure 9 This is a diagram showing the positional relationship between the insulating film and the electrode assembly before assembly, according to an embodiment of the present invention.

[0048] Figure 10 This is a diagram showing the positional relationship between the insulating film, the base plate, and the electrode assembly before assembly, according to an embodiment of the present invention.

[0049] Figure 11 This is a schematic diagram of the structure of the first type of base plate according to an embodiment of the present invention;

[0050] Figure 12 This is a top view of the second type of base plate according to an embodiment of the present invention;

[0051] Figure 13 This is a top view of the third type of base plate according to an embodiment of the present invention.

[0052] Explanation of reference numerals in the attached figures:

[0053] 1. Insulating film; 10. First film area; 101. First positioning hole; 102. Second positioning hole; 103. Tangent; 11. First side; 12. Second side; 13. Third side; 14. Fourth side; 15. First side portion; 16. Second side portion; 20. Second film area; 30. Third film area; 40. Positioning fixture; 401. First positioning pin; 402. Second positioning pin; 50. Electrode assembly; 60. Base plate; 601. Third positioning hole; 602. Fourth positioning hole; 603. Impregnation hole; 70. Cover plate assembly. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] The following is combined with Figures 1 to 13 The following describes embodiments of the present invention.

[0056] According to an embodiment of the present invention, in one aspect, an insulating film 1 is provided, such as... Figures 1 to 4 As shown, the insulating film 1 includes: a first film region 10, the first film region 10 having a first side 11 and a second side 12 disposed opposite to each other along the X direction, and at least one set of positioning holes being formed on the first film region 10, each set of positioning holes including two positioning holes spaced apart along the X direction, one of the two positioning holes being disposed near the first side 11 and the other near the second side 12; each set of positioning holes includes a first positioning hole 101 and a second positioning hole 102, the opening size of the second positioning hole 102 along the X direction being larger than the opening size of the first positioning hole 101 along the X direction, and the opening size of the second positioning hole 102 along the X direction being larger than its opening size along the Y direction. Here, the X direction refers to... Figures 1 to 4 The direction indicated by the middle arrow ("X") is the direction of the Y direction. Figures 1 to 4 The direction of the "Y" indicated by the middle arrow.

[0057] It should be noted that the insulating film 1 has X, Y, and Z directions that intersect each other; preferably, the X, Y, and Z directions are perpendicular to each other, forming a structure as shown in the figure. Figures 1 to 13 The rectangular coordinate system shown; after the insulating film 1 is unfolded, it is parallel to the XY plane, the Z direction is the thickness direction of the insulating film 1, and the extension direction of the longer side on the first film region 10 is the X direction.

[0058] In this embodiment, the insulating film 1 is positioned by providing at least one set of positioning holes on the first film region 10, with each set including two positioning holes spaced apart along the X direction. This ensures the positioning effect and positional stability of the insulating film 1 during assembly, reduces assembly errors or processing deviations caused by inaccurate positioning, and prevents misalignment or skew after the insulating film 1 is wrapped around the electrode assembly. Furthermore, since each set of positioning holes includes a first positioning hole 101 with a relatively small opening size along the X direction and a second positioning hole with a relatively large opening size along the X direction... The large second positioning hole 102 allows the first positioning hole 101 to precisely engage with the positioning pins on the positioning fixture. While providing positioning functionality, the second positioning hole 102 also provides a certain amount of adjustment space in the X direction, allowing the positioning pins on the positioning fixture that engage with the second positioning hole 102 to have a certain amount of deviation in the X direction. This allows it to accommodate the positioning deviation of the positioning fixture, improves the adaptability of the insulating film 1, and provides an insulating film 1 with good positioning effect and high positioning compatibility with the positioning fixture. This facilitates the subsequent assembly of the insulating film 1 with other components and helps to improve the assembly accuracy and efficiency of the battery cell.

[0059] It should be noted that the size of the second positioning hole 102 along the X direction is larger than its size along the Y direction. The positioning pin is cylindrical. The second positioning hole 102 ensures precise matching with the positioning pin by its smaller size (i.e., the opening size along the Y direction) and reduces the deflection of the insulating film. It can also achieve the adjustment function along the X direction by its larger size (i.e., the opening size along the X direction) and is compatible with the positioning deviation of the equipment.

[0060] In one embodiment, the first positioning hole 101 is a round hole, and the second positioning hole 102 is an oblong hole. The round hole and oblong hole have simple structures, are easy to process and form, and have smooth transitions in the hole walls, which helps to reduce damage to the insulating film 1 and facilitates cooperation with the positioning pin, thus improving positioning accuracy.

[0061] In other embodiments, the first positioning hole 101 can also be a square hole, and the second positioning hole 102 can be a rectangular hole, which can also realize the positioning adjustment function along the X direction.

[0062] In one embodiment, the second positioning hole 102 has a dimension L along the X direction and a dimension W along the Y direction, wherein L and W satisfy the relationship: W+1.0 mm≤L≤W+7.5 mm. That is, the difference between L and W is in the range of 1.0 mm≤LW≤7.5 mm. L is the length of the second positioning hole 102, and W is the width of the oblong hole. W must ensure that the second positioning hole 102 can be fitted onto the positioning pin. If L is less than W+1.0 mm, the length of the second positioning hole 102 along the X direction is too small, and the adjustable space provided is limited, which may lead to the problem that the positioning pin cannot be installed in the oblong hole. If L is greater than W+7.5 mm, the length of the second positioning hole 102 along the X direction is too large. After the insulating film 1 is wrapped around the electrode group 50, the second positioning hole 102 will expose too much of the electrode group area, which may cause poor insulation between the shell and the electrode group 50. Therefore, by limiting the difference between L and W to a range of 1.0 mm to 7.5 mm, it is possible to ensure that the second positioning hole 102 has sufficient adjustable space in the X direction to accommodate the positioning deviation of the positioning fixture 40, while also avoiding the problem of poor insulation caused by the second positioning hole 102 being too large.

[0063] Optionally, the difference LW between L and W can be any one of 1.0 mm, 1.5 mm, 2.0 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, or 7.5 mm, or a value between any two of these values.

[0064] In one embodiment, the dimension W of the second positioning hole 102 along the Y direction ranges from 2.5 mm to 9.5 mm. It should be noted that if W is less than 2.5 mm, the width of the second positioning hole 102 along the Y direction is too small, making it difficult for the positioning pin to be inserted into the second positioning hole 102, and the insulating film 1 will have difficulty cooperating with the positioning fixture 40, thus affecting the positioning accuracy of the insulating film 1. If W is greater than 9.5 mm, the width of the second positioning hole 102 along the Y direction is too large, easily causing poor insulation between the housing and the electrode group 50. Therefore, by limiting W to the range of 2.5 mm to 9.5 mm, it is possible to ensure that the second positioning hole 102 can cooperate smoothly with the positioning pin, thereby ensuring the positioning accuracy of the insulating film 1, and also to reduce the probability of poor insulation between the housing and the electrode group 50, thereby improving safety.

[0065] Optionally, W can be any value among 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, 8.0 mm, 8.5 mm, 9.0 mm, and 9.5 mm, or a value between any two values.

[0066] In one embodiment, the dimension of the first positioning hole 101 along the X direction is equal to its dimension along the Y direction, which facilitates the machining of the first positioning hole 101 and makes the fitting clearance between the first positioning hole 101 and the positioning pin equal along the X and Y directions, thereby improving the fitting accuracy between the first positioning hole 101 and the positioning pin.

[0067] In one embodiment, the dimension of the first positioning hole 101 along the X and / or Y directions is D, where the value of D ranges from 2.5 mm to 9.5 mm. If D is less than 2.5 mm, the first positioning hole 101 is too small, making it difficult for the positioning pin to be inserted into the first positioning hole 101, and the insulating film 1 is difficult to cooperate with the positioning fixture 40, thus affecting the positioning accuracy of the insulating film 1. If D is greater than 9.5 mm, the first positioning hole 101 is too large, which can easily cause poor insulation between the housing and the electrode group 50. Therefore, by limiting D to a value within the range of 2.5 mm to 9.5 mm, it is possible to ensure that the first positioning hole 101 can cooperate smoothly with the positioning pin, thereby ensuring the positioning accuracy of the insulating film 1, and also to reduce the probability of poor insulation between the housing and the electrode group 50, thereby improving safety.

[0068] Optionally, D can be any value among 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, 8.0 mm, 8.5 mm, 9.0 mm, and 9.5 mm, or a value between any two values.

[0069] It should be noted that when the first positioning hole 101 is a circular hole, D is the diameter of the circular hole.

[0070] Preferably, the dimension W of the second positioning hole 102 along the Y direction is equal to the dimension D of the first positioning hole 101 along the Y direction. Of course, W and D may not be equal.

[0071] In one embodiment, the number of positioning holes is one set. The positioning holes are centrally located on the first membrane region 10 along the Y direction, which facilitates the layout and processing of the positioning holes and helps to improve processing accuracy and quality. It should be noted that the first membrane region 10 also has a third side 13 and a fourth side 14 arranged opposite to each other along the Y direction. The positioning holes being centrally located on the first membrane region 10 along the Y direction means that the center point of the positioning holes is located at the midpoint of the vertical line connecting the third side 13 and the fourth side 14.

[0072] In other embodiments, the number of positioning hole groups is multiple, and these multiple groups are spaced apart along the Y direction. Multiple positioning holes near the first side 11 are all first positioning holes 101, and multiple positioning holes near the second side 12 are all second positioning holes 102. Here, "multiple groups" refers to two or more groups. By setting the number of positioning hole groups to multiple, the number of positioning points for the insulating film 1 is increased, further improving the positioning effect of the insulating film 1, ensuring the stability of the insulating film 1 on the positioning fixture, further preventing the insulating film 1 from deflecting, ensuring positioning accuracy, and by setting multiple positioning holes near the same side to have the same shape, it is convenient to process the positioning holes and to facilitate the cooperation between the insulating film 1 and the positioning fixture. Preferably, as shown... Figure 3 As shown, there are two sets of positioning holes, with two first positioning holes 101 and two second positioning holes 102.

[0073] In other embodiments, the plurality of positioning holes near the first side 11 include at least one first positioning hole 101 and one second positioning hole 102, and the plurality of positioning holes near the second side 12 include at least one second positioning hole 102 and one first positioning hole 101. By including both the smaller first positioning hole 101 and the larger second positioning hole 102 in the X direction among the plurality of positioning holes near the first side 11 or the second side 12, either end of the insulating film 1 in the X direction can achieve an adjustable function in the X direction based on the positioning function, further improving the positioning effect of the insulating film 1 and its compatibility with positioning fixtures. Preferably, further combined with Figure 4 As shown, there are two sets of positioning holes, with two first positioning holes 101 and two second positioning holes 102, and the first positioning holes 101 and the second positioning holes 102 are arranged alternately.

[0074] In one embodiment, the distance between two adjacent sets of positioning holes along the Y direction is E, where the value of E ranges from 5 mm to 45 mm. It should be noted that if E is less than 5 mm, the distance between the two adjacent sets of positioning holes is too close, resulting in excessive interference between them. This could easily lead to breakage in the area between the two sets of positioning holes during processing, damaging the structural strength of the insulating film 1. If E is greater than 45 mm, the distance between the two sets of positioning holes is too far, with the positioning holes too close to the edges of the insulating film 1 along the Y direction. This results in low structural strength at these edges, making them prone to damage and leading to insulation failure. Therefore, by limiting E to a value between 5 mm and 45 mm, both breakage damage in the area between the two adjacent sets of positioning holes and damage in the area between the positioning holes and the edges of the insulating film 1 can be avoided, thus ensuring the structural strength and insulation performance of the insulating film 1.

[0075] Optionally, the value of E is any one of 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, or a value between any two of these values.

[0076] In one embodiment, along the X direction, the distance between the positioning hole near the first side 11 and the first side 11 is A, where the value of A ranges from 4.5 mm to 35 mm. It should be noted that A is the edge distance between the positioning hole near the first side 11 and the first side 11. If A is less than 4.5 mm, the positioning hole is too close to the edge of the insulating film 1, resulting in poor structural strength at the edge of the insulating film 1 due to the presence of the positioning hole, making it prone to cracking and breakage. If A is greater than 35 mm, the positioning hole is too far from the edge of the insulating film 1, causing the distance between the two positioning holes in the same positioning hole group to be too close, degrading the positioning function provided by the dual positioning holes and leading to poor positioning problems such as the insulating film 1 deflecting and skewing.

[0077] Therefore, limiting A to a value between 4.5 mm and 35 mm can ensure the structural strength of the first membrane region 10 near the first side 11, avoiding cracking and tearing, and also ensure that the distance between the two positioning holes in the same positioning hole group is appropriate, so that the dual positioning holes can provide a good positioning effect, avoid the positioning problem of the insulating film 1 being deflected or skewed, and ensure the positioning effect of the insulating film 1.

[0078] Optionally, the value of A is any one of 4.5 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, or a value between any two of these values.

[0079] In one embodiment, along the X direction, the distance between the positioning hole near the second side 12 and the second side 12 is B, where the value of B ranges from 4.5 mm to 35 mm. Similarly, by limiting B to a value between 4.5 mm and 35 mm, the structural strength of the first membrane region 10 near the edge of the second side 12 can be guaranteed, avoiding cracking and tearing problems. At the same time, it ensures that the distance between the two positioning holes in the same positioning hole group is appropriate, enabling the dual positioning holes to provide a good positioning effect and avoiding poor positioning problems such as deflection or skew of the insulating film 1, thus guaranteeing the positioning effect of the insulating film 1.

[0080] Optionally, the value of B is any one of 4.5 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, or a value between any two of these values.

[0081] Preferably, A equals B. Of course, A and B do not have to be equal.

[0082] In one embodiment, a plurality of tangents 103 are further formed on the first membrane region 10. The tangents 103 penetrate the first membrane region 10 along the Z direction. The positioning holes and the tangents 103 are spaced apart along the Y direction, and the distance between the positioning holes and the tangents 103 along the Y direction is F, wherein the value of F is in the range of 5 mm ≤ F ≤ 30 mm. It should be noted that the electrolyte passes through the insulating membrane 1 via the tangents 103, thereby improving the wettability of the electrolyte to the electrode assembly. If F is less than 5 mm, the distance between the tangents 103 and the positioning holes is too close, the strength of the insulating membrane 1 is insufficient, and it is easy to tear, thus damaging the insulation of the insulating membrane 1. If F is greater than 30 mm, the distance between the tangents 103 and the positioning holes is too far, affecting the distribution of the tangents 103, which is not conducive to the smooth passage of the electrolyte and affects the wettability of the electrolyte to the electrode assembly. Therefore, by limiting F to a value between 5 mm and 30 mm, the structural strength of the insulating film 1 can be guaranteed, thus ensuring insulation, and the electrolyte can smoothly pass through the tangent 103 to wet the electrode assembly, thereby improving the wettability of the electrode assembly.

[0083] It should be noted that the insulating film 1 is wrapped around the outside of the electrode group 50. The electrode group 50 includes a bottom surface of the electrode group away from the opening end of the housing along the Z direction away from the cell. The first film region 10 covers the bottom surface of the electrode group. The electrode group 50 also includes a first side and a second side arranged opposite to each other along the Y direction, and a third side and a fourth side arranged opposite to each other along the X direction. The areas of the first side and the second side are equal, the areas of the third side and the fourth side are equal, and the area of ​​the first side is larger than the area of ​​the third side. That is, the first side and the second side are the larger surfaces among the four sides of the electrode group 50, and the third side and the fourth side are the narrow surfaces.

[0084] In one embodiment, the insulating film 1 further includes a first side portion 15 and a second side portion 16. The first side portion 15 is connected to one side of the first film region 10 along the X direction, and the second side portion 16 is connected to the other side of the first film region 10 along the X direction. The first side portion 15 and the second side portion 16 are bent relative to the first film region 10 and respectively attached to at least a portion of the third side and the fourth side of the electrode assembly 50. The boundary line between the first film region 10 and the first side portion 15 is the first side edge 11, and the boundary line between the first film region 10 and the second side portion 16 is the second side edge 12.

[0085] In one embodiment, the insulating film 1 further includes a second film region 20 and a third film region 30. The second film region 20 is connected to one side of the first film region 10 along the Y direction, and the third film region 30 is connected to the other side of the first film region 10 along the Y direction. The insulating film 1 is a one-piece structure that forms a flat surface when unfolded. The second film region 20 is folded relative to the first film region 10 and covers the first side of the electrode assembly 50, and covers at least a portion of the third and fourth sides. The third film region 30 is folded relative to the first film region 10 and covers the second side of the electrode assembly 50, and covers at least a portion of the third and fourth sides.

[0086] According to an embodiment of the present invention, in another aspect, a mating structure for an insulating film and a positioning tooling is also provided, such as... Figures 5 to 8 As shown, the mating structure of the insulating film and the positioning fixture includes: the positioning fixture 40 and the aforementioned insulating film 1. The positioning fixture 40 includes a fixture body and positioning pins fixedly connected to the fixture body. The number of positioning pins is equal to the number of positioning holes and corresponds one-to-one. The positioning holes on the insulating film 1 are suitable for mating with the positioning pins. It should be noted that the positioning fixture 40 is a tooling device used to position the insulating film 1 during the battery cell assembly process. The positioning fixture 40 includes a plate-shaped fixture body and positioning pins fixedly connected to the fixture body. The positioning pins include a first positioning pin 401 set along the X direction near the fixture body and a second positioning pin 402 set along the other side of the fixture body. The distance between the first positioning pin 401 and the second positioning pin 402 along the X direction is designed according to the actual specifications of the battery cell. During the use of the positioning fixture 40, the positioning holes on the insulating film 1 are each fitted onto a positioning pin, thereby realizing the positioning of the base plate 60 using the positioning fixture. Here, the X direction refers to... Figures 5 to 8 The direction of the "X" indicated by the middle arrow.

[0087] Specifically, the positioning fixture 40 includes at least one set of positioning pins. Each set of positioning pins includes two positioning pins (i.e., a first positioning pin 401 and a second positioning pin 402) spaced apart along the X direction. The number of positioning pin sets is equal to the number of positioning hole sets. When there is one set of positioning hole sets, there is one set of positioning pin sets, including one first positioning pin 401 and one second positioning pin 402. When there are multiple sets of positioning hole sets, there are multiple sets of positioning pin sets, including multiple first positioning pins 401 and multiple second positioning pins 402.

[0088] In one embodiment, the diameter of the positioning pin is d; the dimension D of the first positioning hole 101 along the X and / or Y directions satisfies the relationship 0.5 mm ≤ Dd ≤ 2.0 mm with respect to the diameter d of the positioning pin. It should be noted that the positioning pin is cylindrical, d is the diameter of each positioning pin, and both D and d are in mm. Dd is the clearance between the positioning pin and the positioning hole. If Dd is less than 0.5 mm, the clearance between the positioning pin and the positioning hole is too small, which may cause the positioning pin to fail to fit into the positioning hole, thus affecting normal assembly. If Dd is greater than 2.0 mm, the clearance between the positioning pin and the positioning hole is too large, resulting in poor relative stability between the insulating film 1 and the positioning fixture in the XY plane. The insulating film 1 will move relative to the positioning fixture 40 in the XY plane, affecting the positioning accuracy. Here, the XY plane refers to... Figures 5 to 8 The plane formed by the "X" direction and the "Y" direction indicated by the middle arrow.

[0089] Therefore, by limiting the fitting gap between the first positioning hole 101 and the positioning pin to a range of 0.5 mm to 2.0 mm, it is possible to ensure that the positioning pin can be smoothly inserted into the first positioning hole 101, while avoiding large displacement of the insulating film 1 relative to the positioning fixture 40 in the XY plane. This ensures positioning accuracy, enables the positioning fixture 40 to fix the insulating film 1, and prevents large-scale deflection of the insulating film 1. This further ensures the accuracy of the subsequent assembly and positioning between the base plate 60 and the insulating film 1, guarantees the positioning effect, and prevents the insulating film 1 from deflecting or skewing after being wrapped on the electrode assembly. This facilitates the thermal fusion connection between the insulating film and the insulating components in the cover plate assembly, ensuring the subsequent cell assembly accuracy.

[0090] In one embodiment, the dimension W of the second positioning hole 102 along the Y direction satisfies the relationship 0.5 mm ≤ Wd ≤ 2.0 mm with respect to the diameter d of the positioning pin. Here, the Y direction refers to... Figures 5 to 7The arrow points to the direction of "Y". It should be noted that Wd is the clearance between the second positioning hole 102 and the positioning pin along the Y direction. If Wd is less than 0.5 mm, the clearance between the second positioning hole 102 and the positioning pin is too small, which may cause the positioning pin to fail to fit into the second positioning hole 102, thus affecting normal assembly. If Wd is greater than 2.0 mm, the clearance between the second positioning hole 102 and the positioning pin is too large, resulting in poor relative stability between the insulating film 1 and the positioning fixture in the XY plane. The insulating film 1 may move relative to the positioning fixture 40 in the XY plane, affecting positioning accuracy. Therefore, by limiting the clearance between the second positioning hole 102 and the positioning pin along the Y direction to a range of 0.5 mm to 2.0 mm, it is possible to ensure that the positioning pin can be smoothly inserted into the second positioning hole 102 while avoiding large displacement of the insulating film 1 relative to the positioning fixture 40 in the XY plane, thus ensuring positioning accuracy.

[0091] Optionally, the value of Wd is any one of 0.5 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.0 mm, or a value between any two of these values.

[0092] In one embodiment, the value of d ranges from 2.0 mm to 7.5 mm. It should be noted that d is the diameter of the positioning pin. If d is less than 2.0 mm, the positioning pin is too thin, lacks strength, and is prone to deformation, thus affecting positioning. If d is greater than 7.5 mm, the positioning pin is too thick and difficult to insert into the positioning hole, leading to assembly difficulties. Therefore, by limiting d to the range of 2.0 mm to 7.5 mm, it is possible to ensure that the positioning pin has sufficient strength, preventing deformation that would affect its use, and also to avoid the positioning pin being too thick and difficult to insert into the positioning hole. This ensures the smooth assembly of the insulating film 1 with the positioning fixture, thereby guaranteeing the positioning effect of the positioning fixture on the insulating film 1.

[0093] Optionally, the value of d is any one of 2.0 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, or a value between any two of them.

[0094] According to an embodiment of the present invention, in another aspect, a battery cell is also provided, such as... Figures 9 to 13As shown, the battery cell includes: a housing, an electrode assembly 50, and the aforementioned insulating film. The electrode assembly 50 is disposed within the inner cavity of the housing; the insulating film wraps around the outer side of the electrode assembly 50. It should be noted that the housing has an open end, and the battery cell also includes a cover plate assembly 70, which is disposed at the open end of the housing to close the housing. The cover plate assembly 70 includes a cover plate body and electrode posts, explosion-proof valves, etc., integrated on the cover plate body; the electrode assembly 50 has a bottom surface of the electrode assembly away from the cover plate assembly 70 along the Z direction, and a first film region 10 on the insulating film 1 covers the bottom surface of the electrode assembly. It should be noted that the battery cell has intersecting X, Y, and Z directions; preferably, the X, Y, and Z directions are perpendicular to each other, forming a rectangular coordinate system.

[0095] In one embodiment, the battery cell further includes a bottom support plate 60, which is disposed at the bottom of the housing and located between the housing and the first membrane region 10 of the insulating film 1, for supporting the electrode assembly. The bottom support plate 60 has at least one set of positioning holes, each set including two positioning holes spaced apart along the X direction. The number of positioning hole sets on the bottom support plate 60 is equal to the number of positioning hole sets on the insulating film 1, and they correspond one-to-one.

[0096] It should be noted that during the cell assembly process, the base plate 60 is typically assembled and fixed together with the first film area 10 on the insulating film 1. Then, the insulating film 1 and the base plate 60 are moved together to mate with the electrode assembly 50, which is located on the side of the first film area 10 opposite to the base plate 60. The insulating film 1 is then wrapped around the outside of the electrode assembly 50. Finally, the base plate 60 and the electrode assembly 50 wrapped with the insulating film 1 are installed into the housing. In the prior art, there is a problem with the assembly and positioning of the base plate 60 and the insulating film 1, which can easily lead to positioning deviations, thus affecting the insertion of the electrode assembly into the housing, or causing issues after the insulating film is wrapped around the electrode assembly. The occurrence of misalignment and skewness causes the portion of the insulating film facing the cover assembly to be unable to be thermally fused with the insulating components in the cover assembly, affecting the fixation of the insulating film. In this embodiment, the battery cell has corresponding positioning holes on the base plate 60 and the insulating film 1. During the battery cell assembly process, the positioning fixture is used to position the base plate 60 and the insulating film 1, improving the positioning accuracy between the insulating film 1 and the base plate 60 and ensuring the relative stability of their positional relationship. This improves the positioning accuracy between the insulating film 1 and the base plate 60, reduces the positioning deviation between the insulating film 1, the base plate 60 and the electrode assembly 50, and facilitates the insertion of the electrode assembly into the casing.

[0097] In one embodiment, each group of positioning holes on the base plate 60 includes a third positioning hole 601 and a fourth positioning hole 602. The shape of the third positioning hole 601 is the same as that of the first positioning hole 101, and the shape of the fourth positioning hole 602 is the same as that of the second positioning hole 102. This can improve the positioning accuracy of the base plate 60 on the positioning fixture 40. The base plate 60 can also be compatible with the positioning deviation of the positioning fixture through the positioning hole group, thereby improving the adaptability of the base plate 60. This reduces the positioning assembly difficulty between the base plate 60 and the insulating film 1, thereby reducing the positioning deviation between the insulating film 1, the base plate 60 and the electrode group 50, facilitating the insertion of the electrode group into the casing, and improving the assembly efficiency of the battery cell.

[0098] In one embodiment, the third positioning hole 601 has the same shape and size as the first positioning hole 101, and the number of the third positioning hole 601 and the first positioning hole 101 are the same and correspond one-to-one. The fourth positioning hole 602 has the same shape and size as the second positioning hole 102, and the number of the fourth positioning hole 602 and the second positioning hole 102 are the same and correspond one-to-one. The third positioning hole 601 and the fourth positioning hole 602 have the same technical effects as the first positioning hole 101 and the second positioning hole 102, and will not be described in detail here.

[0099] In one embodiment, such as Figure 11 As shown, the positioning holes on the base plate 60 are a set, and are centrally located along the Y direction on the base plate 60, which facilitates the layout and processing of the positioning holes.

[0100] In other embodiments, the number of positioning hole groups on the base plate 60 is multiple, such as... Figure 12 As shown, the base plate 60 has two sets of positioning holes, with two third positioning holes 601 and two fourth positioning holes 602. The two third positioning holes 601 are set in the same direction along the Y direction, and the two fourth positioning holes 602 are set in the same direction along the Y direction.

[0101] Additionally, in other embodiments, such as Figure 13 As shown, there are two sets of positioning holes on the base plate 60. There are two first positioning holes 101 and two second positioning holes 102, and the first positioning holes 101 and the second positioning holes 102 are arranged alternately.

[0102] In one embodiment, a tangent 103 is also provided on the first membrane region 10 of the insulating film 1, which penetrates the first membrane region 10 to allow the electrolyte to pass through; an impregnation hole 603 is provided on the bottom support plate 60, which penetrates the bottom support plate 60 along the Z direction to allow the electrolyte to pass through; the tangent 103 and the impregnation hole 603 are staggered along the Z direction, which can ensure the wettability of the electrolyte to the electrode assembly 50, and also prevent powder particles falling off the electrode assembly from passing through the tangent 103 and the impregnation hole 603 and contacting the shell, thereby improving the insulation.

[0103] Specifically, the assembly process of the insulating film 1 and the base plate 60 is as follows: First, the base plate 60 is installed onto the positioning fixture 40 by using multiple positioning holes on the base plate 60 to engage with a positioning pin on the positioning fixture 40. Then, the insulating film 1 is installed onto the positioning fixture 40 by engaging multiple positioning holes on the insulating film 1 with a positioning pin on the positioning fixture 40. This achieves the positioning and assembly of the insulating film 1 and the base plate 60 through the positioning fixture 40. Then, the base plate 60 and the insulating film 1 are bonded together by heat fusion. After the insulating film 1 and the base plate 60 are assembled, the insulating film 1 and the base plate 60 are moved together to another fixture platform. The electrode assembly 50 is placed on the side of the insulating film 1 facing away from the base plate 60, and the insulating film 1 is wrapped around the outside of the electrode assembly 50.

[0104] Optionally, the battery cell is a lithium-ion battery cell.

[0105] The following examples and comparative examples verify the influence of different parameter values ​​on the performance of the insulating film. The examples and comparative examples are shown in Table 1.

[0106] Table 1

[0107]

[0108] As shown in Table 1, for the battery cells of Examples 1 to 8, the parameters D, W, L, and LW of the insulating film 1, as well as the mating parameters Dd and Wd between the insulating film and the positioning fixture, are all within the range defined in this application. The results show that the insulating film can be installed on the positioning pin, that is, the positioning pin can smoothly penetrate into the positioning hole on the insulating film. After the insulating film wraps the electrode group, there is no misalignment or skew, and it can be heat-fused to the cover plate. The insulation is good, and no powder particles are released. Here, "heat-fused to the cover plate" means that after the insulating film is wrapped on the electrode group, the part of the insulating film facing the cover plate assembly can be heat-fused with the insulating component in the cover plate assembly, thereby fixing the insulating film.

[0109] For the battery cell of Comparative Example 1, the mating clearance Dd between the first positioning hole 101 and the positioning pin is 0.45 mm, which is less than 0.5 mm and lower than the lower limit defined in this application, and therefore not within the scope defined in this application. For the battery cell of Comparative Example 2, the mating clearance Wd between the second positioning hole 102 and the positioning pin is 0.47 mm, which is less than 0.5 mm and lower than the lower limit defined in this application, and therefore not within the scope defined in this application. In the battery cells of Comparative Examples 1 and 2, the mating clearance between the positioning hole and the positioning pin is too small, the insulating film material is thin and soft, installation and positioning are difficult, the positioning hole cannot be installed onto the corresponding positioning pin, and positioning fails.

[0110] In Comparative Example 4, the mating clearance Dd between the first positioning hole 101 and the positioning pin is 2.27 mm, which is greater than 2.0 mm and exceeds the lower limit defined in this application, thus falling outside the scope of this application. In Comparative Example 5, the mating clearance Wd between the second positioning hole 102 and the positioning pin is 2.56 mm, which is also greater than the lower limit defined in this application, thus falling outside the scope of this application. In Comparative Examples 4 to 5, the mating clearance between the positioning hole and the positioning pin is too large, resulting in inaccurate relative positioning of the insulating film and skewness after coating. This prevents proper heat fusion connection with the cover plate, failing to meet the requirements.

[0111] It is evident that by limiting the fit gap between the positioning hole and the positioning pin to a range of 0.5 mm to 2.0 mm, it is possible to ensure that the positioning pin can be smoothly inserted into the positioning hole while avoiding significant deflection or skew of the insulating film 1. This ensures positioning accuracy and effect, thereby preventing deflection or skew after the insulating film 1 is wrapped around the electrode assembly. Furthermore, it facilitates the thermal fusion connection between the insulating film and the insulating components in the cover plate assembly, ensuring the assembly accuracy of the battery cell.

[0112] In Comparative Example 3, the difference LW between the dimension L of the second positioning hole along the X direction and its dimension W along the Y direction is 0.86 mm, which is less than 1.0 mm and below the lower limit defined in this application. Therefore, it is not within the scope defined in this application. The fit clearance between the positioning hole and the positioning pin is too small, the insulating film material is thin and soft, installation and positioning are difficult, the positioning hole cannot be installed on the corresponding positioning pin, and positioning fails. In Comparative Example 6, LW is 7.92 mm, which is greater than 7.5 mm and above the lower limit defined in this application. Therefore, it is not within the scope defined in this application. The adjustment distance is too large, resulting in a smaller insulation area, poorer insulation effect, and powder particles escaping, which does not meet the requirements. It can be seen that by limiting the difference between L and W to the range of 1.0 mm to 7.5 mm, it is possible to ensure that the second positioning hole 102 has sufficient adjustable space along the X direction to accommodate the positioning deviation of the positioning fixture 40, while avoiding the insulation problem caused by the second positioning hole 102 being too large.

[0113] Although embodiments of the 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 invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. An insulating film, characterized in that, include: A first membrane region is adapted to cover the bottom surface of the electrode assembly. The first membrane region has a first side and a second side that are arranged opposite to each other along the X direction. At least one set of positioning holes is provided on the first membrane region. Each set of positioning holes includes two positioning holes that are spaced apart along the X direction. One of the two positioning holes is located near the first side and the other is located near the second side. Each group of positioning holes includes a first positioning hole and a second positioning hole. The opening size of the second positioning hole along the X direction is larger than the opening size of the first positioning hole along the X direction, and the opening size of the second positioning hole along the X direction is larger than its opening size along the Y direction. The second positioning hole has a dimension of L along the X direction and a dimension of W along the Y direction, wherein L and W satisfy the relationship: W+1.0 mm≤L≤W+7.5 mm; The dimension of the first positioning hole along the X direction is equal to its dimension along the Y direction; The value range of the dimension W of the second positioning hole along the Y direction is: 2.5 mm ≤ W ≤ 9.5 mm; The first positioning hole has a dimension D along the X and / or Y directions, wherein the value of D ranges from 2.5 mm to 9.5 mm. The number of positioning hole groups is multiple, and the multiple positioning hole groups are spaced apart along the Y direction; the distance between two adjacent positioning hole groups along the Y direction is E, where the value of E is in the range of 5 mm ≤ E ≤ 45 mm. The first membrane region is also provided with a plurality of tangents, which penetrate the first membrane region along the Z direction. The positioning holes are spaced apart from the tangents along the Y direction, and the distance between the positioning holes and the tangents along the Y direction is F, wherein the value of F is in the range of 5 mm ≤ F ≤ 30 mm.

2. The insulating film according to claim 1, characterized in that, The plurality of positioning holes disposed near the first side are all the first positioning holes, and the plurality of positioning holes disposed near the second side are all the second positioning holes; or, the plurality of positioning holes disposed near the first side includes at least one first positioning hole and one second positioning hole, and the plurality of positioning holes disposed near the second side includes at least one second positioning hole and one first positioning hole.

3. The insulating film according to any one of claims 1 to 2, characterized in that, The first positioning hole is a round hole, and the second positioning hole is an oblong hole; And / or, along the X direction, the distance between the positioning hole located near the first side and the first side is A, wherein the value of A ranges from 4.5 mm to A to 35 mm. And / or, along the X direction, the distance between the positioning hole located near the second side and the second side is B, wherein the value of B is in the range of 4.5 mm ≤ B ≤ 35 mm.

4. A mating structure between an insulating film and a positioning fixture, characterized in that, include: A positioning fixture, comprising a fixture body and a positioning pin fixedly connected to the fixture body; The insulating film according to any one of claims 1 to 3, wherein the number of positioning pins is equal to the number of positioning holes and corresponds one-to-one, and the positioning holes on the insulating film are adapted to cooperate with the positioning pins.

5. The mating structure of the insulating film and the positioning fixture according to claim 4, characterized in that, The diameter of the positioning pin is d; The dimension D of the first positioning hole along the X and / or Y directions and the diameter d of the positioning pin satisfy the following relationship: 0.5 mm ≤ Dd ≤ 2.0 mm; And / or, the dimension W of the second positioning hole along the Y direction and the diameter d of the positioning pin satisfy the following relationship: 0.5mm≤Wd≤2.0 mm; And / or, the range of values ​​for d is: 2.0 mm ≤ d ≤ 7.5 mm.

6. A battery cell, characterized in that, include: case; The electrode assembly is disposed within the inner cavity of the housing; The insulating film according to any one of claims 1 to 3, wherein the insulating film is wrapped around the outside of the electrode assembly.

Images