Battery cell insulating sheet and battery module
By designing the reinforcement set of battery cell insulating sheets, the problem of concave in the side wall of the aluminum case after the core is rolled into the shell in lithium battery manufacturing is solved, the efficiency of the coating and appearance quality are improved, the cost is reduced and scratches are avoided.
Patent Information
- Application Number
- CN202421789857.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-26
AI Technical Summary
During the lithium battery manufacturing process, after the core is welded into the shell, it is easy to cause the side wall of the aluminum shell to be concave, affecting the appearance flatness and the efficiency of the coating. In addition, existing methods such as increasing the core width or controlling the air pressure value, there are problems such as high cost and easy scratches.
A battery cell insulating sheet is designed, including an integrally connected substrate, a first wall sheet and a second wall sheet, and a first and second reinforcement sets are arranged outside, through which the core is effectively prevented from being recessed in the shell after the rolling core is inserted into the shell.
It effectively prevents the side of the battery cell from being concave, improves the efficiency of the coating, reduces the appearance of the product, reduces the cost of the core usage, and avoids scratching between the core and the aluminum shell mouth.
Smart Images
Figure CN222883828U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of lithium ion batteries and relates to a battery core insulating sheet and a battery module. Background Art
[0002] In the process of lithium battery manufacturing, after the core is welded into the shell, there are many subsequent testing steps such as high-temperature static placement of helium test fluid, etc., which involve the problem of internal and external pressure difference, and there is a certain gap between the core and the aluminum shell. These steps will more or less have the risk of concave on the outer shell of the battery cell, resulting in uneven appearance, and finally, bubbles and wrinkles are prone to occur when wrapping the blue film. In the prior art, the method to prevent the concave of the aluminum shell is to increase the width of the core, thereby achieving a supporting effect to prevent the concave of the side wall of the aluminum shell. Another method is to control the air pressure value in the supporting process, increase the width of the core, increase the amount of diaphragm and foil, and leave a certain gap between the side of the core and the inner wall of the aluminum shell. When the internal pressure of the battery cell is negative, there is still a concave phenomenon. In addition, the gap from the side of the core to the inner wall of the aluminum shell is too tight, which makes it easy for the core to be scratched against the mouth of the aluminum shell when entering the shell.
[0003] Based on this, the art urgently needs a battery cell insulation sheet and a battery module to solve the above technical problems. Utility Model Content
[0004] In view of this, the purpose of the present invention is to solve the above problems and provide a battery core insulating sheet and a battery module.
[0005] In order to solve the above technical problems, the utility model provides a battery cell insulating sheet, including a base sheet, a first wall sheet and a second wall sheet connected as one piece, the first wall sheet and the second wall sheet are arranged in parallel and the first wall sheet and the second wall sheet are respectively perpendicular to the base sheet, a first reinforcement group is arranged outside the first wall sheet, and a second reinforcement group is arranged outside the second wall sheet.
[0006] As a further improvement of the present invention, the first reinforcement group includes a plurality of reinforcements horizontally arranged outside the first wall piece, and the second reinforcement group includes a plurality of reinforcements horizontally arranged outside the second wall piece, and the reinforcements of the first reinforcement group correspond one-to-one with the reinforcements of the second reinforcement group in the horizontal direction.
[0007] As a further improvement of the present invention, first side wall pieces are integrally connected to each other on both sides of the first wall piece, and second side wall pieces are integrally connected to each other on both sides of the second wall piece, and the first side wall piece and the second side wall piece partially overlap.
[0008] As a further improvement of the present invention, a cut corner is provided on a side of the first side wall piece close to the base piece, and the first side wall piece is overlapped and arranged on the outer side of the second side wall piece.
[0009] As a further improvement of the present invention, a third reinforcement group is arranged outside the first side wall piece, and the third reinforcement group includes a plurality of reinforcements horizontally arranged outside the first side wall piece, and the reinforcements of the third reinforcement group correspond one-to-one with the reinforcements of the second reinforcement group in the horizontal direction.
[0010] As a further improvement of the present invention, the first reinforcement component group is integrally formed with the first wall piece, the second reinforcement component group is integrally formed with the second wall piece, and the third reinforcement component group is integrally formed with the first side wall piece.
[0011] As a further improvement of the present invention, the reinforcing member is a reinforcing rib, and the edges of the reinforcing rib are arc-shaped or inclined.
[0012] As a further improvement of the present invention, the cross-sectional shape of the reinforcing rib is any one of a triangle, a semicircle, a semi-ellipse, a trapezoid, a square and a rectangle.
[0013] The utility model also provides a battery module, including a shell and a battery cell group accommodated in the shell, the battery cell group is coated with any of the above-mentioned battery cell insulation sheets, the substrate is provided with positioning holes, and the shell and the battery cell group are respectively provided with first positioning members and second positioning members corresponding to the positioning holes.
[0014] As a further improvement of the present invention, gaps are provided between the first reinforcement member group, the second reinforcement member group and the third reinforcement member group and the shell.
[0015] The technical effect of the utility model is: compared with the prior art, the utility model provides a battery cell insulating sheet and a battery module, which effectively prevents the shell from being concave after the core is put into the shell and welded by arranging a first reinforcement group on the outside of the first wall sheet and a second reinforcement group on the outside of the second wall sheet, can solve the problem of the concave side of the battery cell, improve the coating efficiency, and reduce the appearance of defective products. Compared with the prior art of preventing the concave side wall of the aluminum shell by increasing the width of the core, the cost of the core is lower. Compared with the prior art of preventing the concave side wall of the aluminum shell by controlling the air pressure value in the supporting process, it avoids the occurrence of scratches between the core and the aluminum shell mouth when the core is put into the shell. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the utility model, rather than all of the embodiments. For ordinary technicians in this field, without paying creative work, other drawings obtained based on these drawings all fall within the scope of protection of the utility model.
[0017] Figure 1 It is a plan view of a battery core insulating sheet provided by an embodiment of the utility model;
[0018] Figure 2 It is a three-dimensional diagram of a battery core insulating sheet provided by an embodiment of the utility model;
[0019] Figure 3 It is a three-dimensional diagram of a battery module provided by an embodiment of the utility model;
[0020] Figure 4 yes Figure 3 Explosion diagram.
[0021] Among them, 10 is a substrate, 11 is a positioning hole, 20 is a first wall piece, 201 is a first reinforcement group, 21 is a first side wall piece, 211 is a third reinforcement group, 30 is a second wall piece, 301 is a second reinforcement group, 31 is a second side wall piece, 400 is a reinforcement, 50 is a battery cell group, and 60 is a shell. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0023] In order to make the description of the disclosed content more detailed and complete, the following is an illustrative description of the implementation method and specific examples of the utility model; however, this is not the only form of implementing or using the specific examples of the utility model. The implementation method covers the features of multiple specific examples and the method steps and their sequence for constructing and operating these specific examples. However, other specific examples can also be used to achieve the same or equal functions and step sequences. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0025] It should be understood that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.
[0026] In the description of the present invention, the terms "front", "rear", "top", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0027] Please refer to Figure 1-Figure 4 An embodiment of the utility model provides a battery core insulating sheet and a battery module to solve the problem of a large inward concavity of the side wall of the aluminum shell.
[0028] For details, please refer to Figure 1 The utility model provides a plan view of a battery core insulating sheet according to an embodiment of the utility model. The utility model provides a battery core insulating sheet, including a base sheet 10, a first wall sheet 20 and a second wall sheet 30 connected in one piece. Figure 2 A three-dimensional diagram of a battery core insulating sheet provided by an embodiment of the utility model, wherein the first wall sheet 20 and the second wall sheet 30 can be folded to form a square box body, the first wall sheet 20 is bent along the connection with the substrate 10 to be perpendicular to the substrate 10, the second wall sheet 30 is bent along the connection with the substrate 10 to be perpendicular to the substrate 10, the first wall sheet 20 and the second wall sheet 30 have the same bending direction, the first wall sheet 20 and the second wall sheet 30 are arranged in parallel and the first wall sheet 20 and the second wall sheet 30 are respectively perpendicular to the substrate 10, the first wall sheet 20 is provided with a first reinforcement member group 201 on the outside, and the second wall sheet 30 is provided with a second reinforcement member group 301 on the outside. The strength of the first wall sheet 20 is strengthened by the setting of the first reinforcement member group 201, and the strength of the second wall sheet 30 is strengthened by the setting of the second reinforcement member group 301, and at the same time, it is ensured that the folding to form a square box body will not produce a concave.
[0029] The utility model provides a battery cell insulating sheet, which effectively prevents the shell 60 from being concave after the core is put into the shell for welding by arranging a first reinforcement component group 201 on the outside of the first wall sheet 20 and a second reinforcement component group 301 on the outside of the second wall sheet 30, can solve the problem of the concave side of the battery cell, improve the coating efficiency, and reduce the number of defective products in appearance. Compared with the prior art of preventing the concave side wall of the aluminum shell by increasing the width of the core, the cost of the core usage is lower. Compared with the prior art of preventing the concave side wall of the aluminum shell by controlling the air pressure value in the supporting process, it avoids the occurrence of scratches between the core and the aluminum shell mouth when the core is put into the shell.
[0030] As a further improvement of the present invention, the first reinforcement member group 201 includes a plurality of reinforcement members 400 horizontally arranged outside the first wall piece 20, and the second reinforcement member group 301 includes a plurality of reinforcement members 400 horizontally arranged outside the second wall piece 30, and the reinforcement members 400 of the first reinforcement member group 201 correspond one to one with the reinforcement members 400 of the second reinforcement member group 301 in the horizontal direction. In practical applications, the number of reinforcement members 400 of the first reinforcement member group 201 and the number of reinforcement members 400 of the second reinforcement member group 301 are set according to the size of the first wall piece 20 and the second wall piece 30. When a larger roll core needs to be wrapped, the size of the corresponding first wall piece 20 and the second wall piece 30 will also increase accordingly. In order to achieve a better compression resistance effect, the number of reinforcement members 400 set should also increase accordingly. In this embodiment, the number of reinforcement members 400 of the first reinforcement member group 201 and the number of reinforcement members 400 of the second reinforcement member group 301 are equal, and the number of reinforcement members 400 of the first reinforcement member group 201 is equal to the number of reinforcement members 400 of the second reinforcement member group 301. The reinforcement members 400 correspond one-to-one with the reinforcement members 400 of the second reinforcement member group 301 in the horizontal direction, ensuring that the stresses in the horizontal direction of the first wall sheet 20 and the second wall sheet 30 are equal, further enhancing the compressive resistance of the battery cell insulating sheet. Preferably, in this embodiment, the reinforcement members 400 of the first reinforcement member group 201 are uniformly and horizontally arranged outside the first wall sheet 20, and the spacing distance between adjacent reinforcement members 400 of the first reinforcement member group 201 is between 20 mm and 50 mm. Preferably, the spacing distance between adjacent reinforcement members 400 of the first reinforcement member group 201 is 30 mm.
[0031] As a further improvement of the present invention, the first wall piece 20 is provided with an integrally connected first side wall piece 21 on both sides, and the second wall piece 30 is provided with an integrally connected second side wall piece 31 on both sides, and the first side wall piece 21 and the second side wall piece 31 partially overlap. By providing the integrally connected first side wall piece 21 on both sides of the first wall piece 20 and the integrally connected second side wall piece 31 on both sides of the second wall piece 30, the structural stability of the square box body formed by the folding of the battery core insulating sheet is ensured, and the winding core can be further better covered. By partially overlapping the first side wall piece 21 and the second side wall piece 31, the reliability of the winding core covering is further improved, and the structural stability of the battery core insulating sheet is further strengthened.
[0032] As a further improvement of the present invention, the first side wall sheet 21 is provided with a cut corner on the side close to the substrate 10, and the first side wall sheet 21 is overlapped and arranged on the outside of the second side wall sheet 31. By setting the cut corner on the side close to the substrate 10 of the first side wall sheet 21, the electrode can better enter the internal winding core, which is convenient for liquid reaction. The first side wall sheet 21 is overlapped and arranged on the outside of the second side wall sheet 31, which avoids the cut corner set on the first side wall sheet 21 from scratching the winding core, thereby improving the safety of the battery core insulation sheet.
[0033] As a further improvement of the present invention, a third reinforcement member group 211 is arranged outside the first side wall sheet 21, and the third reinforcement member group 211 includes a plurality of reinforcement members 400 arranged horizontally outside the first side wall sheet 21, and the reinforcement members 400 of the third reinforcement member group 211 correspond one-to-one with the reinforcement members 400 of the second reinforcement member group 301 in the horizontal direction. The arrangement of the third reinforcement member group 211 strengthens the strength of the first side wall sheet 21, and at the same time, ensures that the side where the first side wall sheet 21 is located is concave, further improving the overall pressure resistance and anti-concave performance of the battery cell insulation sheet, the number of reinforcement members 400 of the third reinforcement member group 211 is equal to the number of reinforcement members 400 of the second reinforcement member group 301, and the reinforcement members 400 of the third reinforcement member group 211 correspond one-to-one with the reinforcement members 400 of the second reinforcement member group 301 in the horizontal direction.
[0034] As a further improvement of the present utility model, the first reinforcement member group 201 is integrally formed with the first wall piece 20, the second reinforcement member group 301 is integrally formed with the second wall piece 30, and the third reinforcement member group 211 is integrally formed with the first side wall piece 21. By arranging that the first reinforcement member group 201 is integrally formed with the first wall piece 20, the second reinforcement member group 301 is integrally formed with the second wall piece 30, and the third reinforcement member group 211 is integrally formed with the first side wall piece 21, the connection strength of the first reinforcement member group 201, the second reinforcement member group 301 and the second reinforcement member group 301 can be ensured, and the anti-sag performance of the battery cell insulation sheet can be improved.
[0035] As a further improvement of the present invention, the reinforcing member 400 is a reinforcing rib, and the edges of the reinforcing rib are arc-shaped or inclined. By setting the edges of the reinforcing rib to be arc-shaped or inclined, it is possible to avoid scratching the side wall of the shell 60 when the battery is taken out of the shell or put into the shell, thereby improving the safety of the battery core insulation sheet.
[0036] As a further improvement of the present invention, the cross-sectional shape of the reinforcing rib is any one of a triangle, a semicircle, a semi-ellipse, a trapezoid, a square and a rectangle. By setting the cross-sectional shape of the reinforcing rib to be any one of a triangle, a semicircle, a semi-ellipse, a trapezoid, a square and a rectangle, and the edges of the reinforcing rib are arc-shaped or inclined, the core insulating sheet can avoid excessive stress concentration when subjected to torsion, thereby improving torsion resistance.
[0037] The utility model also provides a battery module, including a shell 60 and a battery cell group 50 accommodated in the shell 60, the battery cell group 50 is coated with any of the above-mentioned battery cell insulation sheets, the substrate 10 is provided with a positioning hole 11, the shell 60 and the battery cell group 50 are respectively provided with a first positioning member (not shown) and a second positioning member (not shown) corresponding to the positioning hole 11. By providing the positioning hole 11 on the substrate 10, the shell 60 and the battery cell group 50 are respectively provided with a first positioning member and a second positioning member corresponding to the positioning hole 11, the battery cell group 50 can be positioned, and the battery cell insulation sheet and the shell 60 can be improved so that they will not slide against each other and cause displacement.
[0038] As a further improvement of the present invention, gaps are provided between the first reinforcement member group 201, the second reinforcement member group 301 and the third reinforcement member group 211 and the housing 60. By providing gaps between the first reinforcement member group 201, the second reinforcement member group 301 and the third reinforcement member group 211 and the housing 60, the distance between the reinforcement rib and the housing 60 can be adjusted, and the deformation resistance of the battery module can be adjusted accordingly, which can better solve the problem of large inward concavity of the side wall of the battery module.
[0039] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0040] The above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the attached claims.
Claims
1. A battery core insulating sheet, characterized in that: It includes a base sheet, a first wall sheet and a second wall sheet that are integrally connected. The first wall sheet and the second wall sheet are arranged in parallel and are respectively perpendicular to the base sheet. A first reinforcement group is arranged outside the first wall sheet, and a second reinforcement group is arranged outside the second wall sheet.
2. The battery core insulating sheet according to claim 1, characterized in that: The first reinforcement group includes a plurality of reinforcements horizontally arranged outside the first wall piece, and the second reinforcement group includes a plurality of reinforcements horizontally arranged outside the second wall piece. The reinforcements of the first reinforcement group correspond one-to-one with the reinforcements of the second reinforcement group in the horizontal direction.
3. The battery core insulating sheet according to claim 2, characterized in that: The first wall piece is provided with first side wall pieces integrally connected to both sides, and the second wall piece is provided with second side wall pieces integrally connected to both sides. The first side wall piece and the second side wall piece partially overlap.
4. The battery core insulating sheet according to claim 3, characterized in that: A cut corner is provided on a side of the first side wall piece close to the base piece, and the first side wall piece is overlapped and arranged on the outer side of the second side wall piece.
5. The battery core insulating sheet according to claim 4, characterized in that: A third reinforcement group is arranged outside the first side wall piece, and the third reinforcement group includes a plurality of reinforcements horizontally arranged outside the first side wall piece. The reinforcements of the third reinforcement group correspond one-to-one with the reinforcements of the second reinforcement group in the horizontal direction.
6. The battery core insulating sheet according to claim 5, characterized in that: The first reinforcement component group is integrally formed with the first wall piece, the second reinforcement component group is integrally formed with the second wall piece, and the third reinforcement component group is integrally formed with the first side wall piece.
7. The battery core insulating sheet according to claim 6, characterized in that: The reinforcing member is a reinforcing rib, and the edges of the reinforcing rib are arc-shaped or inclined.
8. The battery core insulating sheet according to claim 7, characterized in that: The cross-sectional shape of the reinforcing rib is any one of a triangle, a semicircle, a semi-ellipse, a trapezoid, a square and a rectangle.
9. A battery module, characterized in that: It comprises a shell and a battery cell group accommodated in the shell, the battery cell group is coated with the battery cell insulation sheet according to any one of claims 1 to 8, the substrate is provided with a positioning hole, and the shell and the battery cell group are respectively provided with a first positioning piece and a second positioning piece corresponding to the positioning hole.
10. The battery module according to claim 9, characterized in that: Gaps are provided between the first reinforcement member group, the second reinforcement member group and the third reinforcement member group and the housing.