Battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery, which is used for improving the fixing effect between a laminated battery cell and an insulating film and improving the quality of the battery. The battery comprises a cover plate, a laminated cell and a first insulating film, the first insulating film is located on one side, facing the laminated cell, of the cover plate, the laminated cell comprises a first large surface and a second large surface which are opposite, and the first large surface is located on one side, facing the cover plate, of the second large surface; a first bonding part is arranged on one side, deviating from the cover plate, of the first insulating film, the first insulating film is bonded with the first large surface of the laminated cell through the first bonding part, and the coverage rate of the first bonding part on the first large surface is greater than or equal to 70%.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery. Background Technology

[0002] In the production process of lithium battery cell films, a robotic arm is typically used to neatly and evenly stack the positive electrode sheet, negative electrode sheet, and insulating film together to form a cell. After the cells are stacked, they are transferred to a hot-pressing module. After hot pressing, a robotic arm transfers the cells to a machine that wraps the insulating film. After the insulating film and cell are loaded and positioned, the robotic arm wraps the insulating film over the cell surface, and adhesive film is applied to the seams of the insulating film.

[0003] During the process of coating the battery cell with the insulating film, the surface of the insulating film is smooth, and misalignment between the battery cell and the insulating film is easy to occur. This can lead to the surface of the battery cell being exposed after the insulating film is coated, resulting in insulation failure and affecting the quality of the battery cell. Utility Model Content

[0004] This invention provides a battery that can improve the fixing effect between the stacked cells and the insulating film, thereby improving the quality of the battery.

[0005] This utility model provides a stacked battery, including a cover plate, stacked cells and a first insulating film;

[0006] The first insulating film is located on the side of the cover plate facing the stacked cell, and the stacked cell includes a first large surface and a second large surface opposite to each other, with the first large surface located on the side of the second large surface facing the cover plate;

[0007] The first insulating film has a first adhesive portion on the side opposite to the cover plate. The first insulating film is bonded to the first large surface of the stacked cell through the first adhesive portion. The coverage of the first adhesive portion on the first large surface is greater than or equal to 70%.

[0008] The battery provided by this utility model has a first adhesive portion on a first insulating film. When the first insulating film is used to cover the stacked battery cells, the first adhesive portion can adhere to the first large surface of the stacked battery cells. Because the first adhesive portion has a high coverage on the first large surface, it ensures the fixation effect between the first insulating film and the stacked battery cells. This allows the first insulating film to be relatively fixed to the stacked battery cells when covering them, preventing the stacked battery cells from shifting relative to the first insulating film. This ensures the insulation effect of the battery cells after the first insulating film is included, thus improving the quality of the battery. Attached Figure Description

[0009] Figure 1 This is a cross-sectional structural diagram of a battery in an embodiment of this utility model;

[0010] Figure 2 This is a schematic diagram of the structure of a battery in one embodiment of the present invention;

[0011] Figure 3 This is a schematic diagram of one structure of the stacked battery cell in an embodiment of this utility model;

[0012] Figure 4 This is a schematic diagram of a structure in which the first insulating film is wrapped around a laminated battery cell in an embodiment of the present invention;

[0013] Figure 5 This is a schematic diagram of another structure in which the first insulating film is wrapped around the laminated battery cell in an embodiment of this utility model;

[0014] Figure 6 This is a partial structural diagram of the battery in an embodiment of this application;

[0015] Figure 7 This is a schematic diagram of a structure in which the first insulating film and the second insulating film are wrapped around the electro-laminated core in an embodiment of the present invention;

[0016] Figure 8 This is a schematic diagram of another structure in which the first insulating film and the second insulating film cover the laminated battery cell in an embodiment of the present invention;

[0017] Figure 9 This is a schematic diagram of another structure in which the first insulating film and the second insulating film cover the laminated battery cell in an embodiment of the present invention;

[0018] Figure 10 This is a schematic diagram of another structure in which the first insulating film and the second insulating film cover the laminated battery cell in an embodiment of the present invention;

[0019] Figure 11 This is a schematic diagram of one structure of the cover plate in an embodiment of the present utility model;

[0020] Figure 12 This is a schematic diagram of a structure in which the first insulating film is pasted onto the cover plate in an embodiment of this utility model;

[0021] Figure 13 For Figure 12 A schematic diagram of a structure in which laminated cells are attached to a first insulating film;

[0022] Figure 14 For Figure 13 A schematic diagram of a structure in which a second insulating film is attached to a laminated battery cell;

[0023] Figure 15 For Figure 14 A schematic diagram of a structure in which the first insulating film and the second insulating film are used to complete the coating of the laminated battery cell.

[0024] In the picture:

[0025] 10-Cover plate; 20-Laminated cell; 21-First large surface; 22-Long side surface; 23-Second large surface; 30-First insulating film; 40-Second insulating film; 50-Shell. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] refer to Figure 1 The battery in this embodiment may include a cover plate 10, a stacked cell 20, and a first insulating film 30, wherein the first insulating film 30 is located on the side of the cover plate 10 facing the stacked cell 20. The stacked cell 20 includes a first large surface 21 and a second large surface 23 facing each other, with the first large surface 21 located on the side of the second large surface 23 facing the cover plate 23.

[0028] A first adhesive portion may be provided on the side of the first insulating film 20 facing away from the cover plate 10. The first insulating film 20 is bonded to the first large surface of the laminated cell 20 through the first adhesive portion, and the first insulating film 20 covers the first large surface 21. The coverage of the first adhesive portion on the first large surface 21 is greater than or equal to 70%.

[0029] In this embodiment, because the first adhesive portion covers a large area of ​​the first large surface 21, when the first insulating film 30 is bonded to the first large surface 21, the bonding effect between the first insulating film 30 and the first large surface 21 can be guaranteed, thereby achieving relative fixation between the first insulating film 30 and the first large surface 21. Thus, after the first insulating film 30 and the stacked cell 20 are completely covered, the stacked cell 20 will not shift relative to the first insulating film 30, thereby ensuring the insulation effect and improving the quality of the battery.

[0030] The coverage rate of the first adhesive portion on the first large surface 21 is greater than or equal to 70%. When the coverage rate of the first adhesive portion on the first large surface 21 is 100%, the first adhesive portion completely covers the first large surface 21. When the coverage rate of the first adhesive portion on the first large surface 21 is less than 100%, the first adhesive portion can cover the center part of the first large surface 21. This facilitates a smooth bonding area between the first insulating film 30 and the first large surface 21.

[0031] refer to Figure 2In this embodiment, the battery may further include a housing 50, one end of which has an opening so that the housing 50 can cover the stacked battery cell 20. The side of the housing 50 with the opening is fixedly connected to the cover plate 10. The housing 50 and the cover plate cooperate to form a relatively sealed space in which the stacked battery cell 20 is placed, thereby fixing and protecting the stacked battery cell 20.

[0032] It is worth mentioning that, such as Figure 2 As shown, the housing 50 can be used to form a cavity for accommodating the stacked battery cells 20. In this case, the cover plate 10 can seal the housing 50 by covering the opening of the housing 50, and the cover plate 10 is a metal cover plate. In some other embodiments, the cover plate 10 can also be the surface of the battery housing.

[0033] Refer again Figure 1 The first insulating film 20 may also be provided with a second adhesive part on the side facing the cover plate 10. When the first insulating film 30 is placed on the cover plate 10, the first insulating film 30 can be bonded to the cover plate 10 through the second adhesive part, so as to fix the first insulating film 30 to the cover plate 10 and ensure that the first insulating film 30 will not shift relative to the cover plate 10.

[0034] The adhesion of the second adhesive portion can be greater than that of the first adhesive portion. Since the surface of the laminated cell 20 has a separator, when the first insulating film 30 is bonded to the first large surface 21, it is actually the first adhesive portion that is bonded to the separator. If the adhesion of the first adhesive portion is too high, it will cause the separator to wrinkle, thereby creating a risk of lithium plating. Therefore, designing the adhesion of the first adhesive portion to be relatively low can ensure that the first insulating film 30 is fixed to the laminated cell 20 while also preventing lithium plating of the laminated cell 20.

[0035] In some embodiments, reference Figure 3 The laminated cell 20 may also include two long side surfaces 22 connected between the first large surface 21 and the second large surface 23, and the two long side surfaces 22 are arranged along the width direction of the laminated cell 20.

[0036] In this embodiment, reference is also made to Figure 3 and Figure 4 The width of the first insulating film 30 is greater than the width of the laminated cell 20. In this case, the portion of the first insulating film 30 extending beyond the first large surface 21 along the width direction of the laminated cell 20 can be bent towards the laminated cell 20, so that the first insulating film 30 can cover the two long side surfaces 22 of the laminated cell 20. A first adhesive portion can also be provided on the portion of the first insulating film 30 directly opposite the long side surface 22, so that the first insulating film 30 can be bonded to the long side surface 22 through the first adhesive portion, thereby enhancing the bonding effect between the first insulating film 30 and the laminated cell 20.

[0037] Further, refer to Figure 5 and Figure 6 When the first insulating film 30 covers the two long sides 22 of the laminated cell 20, the dimension of the first insulating film 30 in the thickness direction of the laminated cell 20 can be larger than the dimension of the long sides 22. In this case, the portion of the first insulating film 30 that extends beyond the long sides 22 can be bent toward the second large surface 23, so that the portion of the first insulating film 30 that extends beyond the long sides 22 can cover the second large surface 23.

[0038] The first insulating film 30 may also have a first adhesive portion at the position opposite the second large surface 23, so that the first insulating film 30 can be bonded to the second large surface 23 through the first adhesive portion, thereby further enhancing the bonding effect between the first insulating film 30 and the laminated cell 20.

[0039] In some embodiments, reference Figure 7 In this embodiment, the battery may further include a second insulating film 40, which is located on the side of the stacked cell 20 facing away from the cover plate 10. A third adhesive portion may be provided on the side of the second insulating film 40 facing the stacked cell 20, allowing the second insulating film 40 to be adhered to and cover the second large surface 23 of the stacked cell 20 via the third adhesive portion. In this case, the second insulating film 40 and the first insulating film 30 cooperate to cover the stacked cell 20. This avoids the first insulating film 30 being too large and prone to wrinkles when only the first insulating film 30 is used to cover the stacked cell 20. This ensures that when the first insulating film 30 and the second insulating film 40 are adhered to the surface of the stacked cell 20, the surfaces are flat and free of air bubbles.

[0040] The adhesiveness of the third adhesive part can be the same as that of the first adhesive part. In this way, while ensuring that the second insulating film 40 is fixed to the stacked cell 20, lithium plating of the stacked cell 20 can also be prevented.

[0041] Based on this, the width of the first insulating film 30 can be greater than the width of the stacked cell 20. In this case, the portion of the first insulating film 30 that extends beyond the first large surface 21 of the stacked cell 20 can be bent toward the stacked cell 20, so that the portion of the first insulating film 30 that extends beyond the first large surface 21 can be bonded to the side surface 22 of the cell 20 through the first adhesive portion.

[0042] Alternatively, the width of the second insulating film 40 may be greater than the width of the laminated cell 20. When the second insulating film 40 is bonded to the second large surface 23 of the laminated cell 20 via the third adhesive portion, a portion of the second insulating film 40 extends beyond the second large surface 23. In this case, the portion of the second insulating film 40 extending beyond the second large surface 23 can be bent toward the laminated cell 20, thereby allowing the portion of the second insulating film 40 extending beyond the second large surface 23 to be bonded to the long side surface 22 of the laminated cell 20 via the third adhesive portion.

[0043] In addition, the length of the first insulating film 30 can be the same as the length of the laminated cell 20, and the length of the second insulating film 40 can also be the same as the length of the laminated cell 20, so that the first insulating film 30 and the second insulating film 40 can completely cover the surface of the laminated cell 20 in the length direction.

[0044] Based on this, as an optional implementation plan, we will refer again... Figure 7 The width of the first insulating film 30 is greater than the width of the laminated cell 20, and the width of the second insulating film 40 is equal to the width of the laminated cell 20. In this case, the laminated cell 20 is bonded to the middle of the first insulating film 30 through the first adhesive portion. While the first insulating film 30 covers the first large surface 21 of the laminated cell 20, its two side edges can be bent toward the laminated cell 20 respectively, so that the two side edges of the first insulating film 30 can be bonded to the two long side surfaces 22 of the laminated cell 20 through the first adhesive portion.

[0045] Furthermore, the second insulating film 40 is bonded to the second large surface 23 of the battery cell 20 through the third adhesive portion, and each edge of the second insulating film 40 is flush with each edge of the second large surface 23, so that the second insulating film 40 completely covers the second large surface 23.

[0046] In this embodiment, the width of the first insulating film 30 can be the same as the sum of the width of the first large surface 21 and the width of the two long side surfaces 22 of the laminated cell 20. When the first insulating film 30 is bonded to the two long side surfaces 22, the first insulating film 30 can completely cover the two long side surfaces 22 of the laminated cell 20. Thus, the first insulating film 30 and the second insulating film 40 can cooperate to cover the surface of the laminated cell 20.

[0047] As another alternative implementation scheme, refer to Figure 8 The width of the first insulating film 30 is greater than the width of the laminated cell 20, and the width of the second insulating film 40 is also greater than the width of the laminated cell 20. In this case, the laminated cell 20 is bonded to the middle of the first insulating film 30 through the first adhesive portion. While the first insulating film 30 covers the first large surface 21 of the laminated cell 20, its two side edges can be bent toward the laminated cell 20 respectively, so that the two side edges of the first insulating film 30 can be bonded to the two long side surfaces 22 of the laminated cell 20 through the first adhesive portion.

[0048] Furthermore, the second large surface 23 of the laminated cell 20 is bonded to the middle of the second insulating film 40 through the third adhesive portion. While covering the second large surface 23, the edges of the second insulating film 40 on both sides can be bent toward the laminated cell 20, so that the edges of the second insulating film 40 on both sides can be bonded to the two long sides 22 through the third adhesive portion.

[0049] It is worth noting that, in this embodiment, the first insulating film 30 and the second insulating film 40 cooperate to cover the long side 22 of the laminated battery cell 20. Exemplarily, the widths of the first insulating film 30 and the second insulating film 40 may be the same, and when the first insulating film 30 and the second insulating film 40 are adhered to the long side 22 of the laminated battery cell 20, the first insulating film 30 only covers the lower half of the long side 22, and the second insulating film 40 covers the upper half of the long side 22, thereby enabling the first insulating film 30 and the second insulating film 40 to cooperate in covering the long side 22 of the laminated battery cell 20.

[0050] As another alternative implementation scheme, refer to Figure 9 The width of the first insulating film 30 is greater than the width of the laminated cell 20, and the width of the second insulating film 40 is also greater than the width of the laminated cell 20. In this case, when the laminated cell 20 is bonded to the first insulating film 30, one side of the laminated cell 20 can be flush with one side edge of the first insulating film 30. While the first insulating film 30 covers the first large surface 21, the edge of the other side can be bent toward the laminated cell 20 so that the edge of that side can be bonded to one of the long side surfaces 22 of the laminated cell 20 through the first adhesive part.

[0051] Furthermore, when the second insulating film 40 is bonded to the second large surface 23 of the laminated cell 20 through the third adhesive portion, one edge of the second insulating film 40 can be flush with the other side of the laminated cell 20. While covering the second large surface 23, the edge of the second insulating film 40 on the other side can be bent toward the laminated cell 20 so that the edge on that side can be bonded to the other long side surface 22 of the laminated cell 20 through the third adhesive portion.

[0052] In this embodiment, the width of the first insulating film 30 can be equal to the sum of the width of the cell 20 and the width of one long side surface 22, so that when the first insulating film 30 is bonded to the long side surface 22, the first insulating film 30 can cover the long side surface 22. Similarly, the width of the second insulating film 40 can also be equal to the sum of the width of the laminated cell 20 and the width of one long side surface 22, so that when the second insulating film 40 is bonded to the long side surface 22, the second insulating film 40 can cover the long side surface 22.

[0053] As another alternative implementation scheme, refer to Figure 10 The width of the first insulating film 30 is equal to the width of the laminated cell 20, and the width of the second insulating film 40 is greater than the width of the laminated cell 20. In this case, when the laminated cell 20 is bonded to the first insulating film 30 through the first adhesive portion, the two side edges of the first insulating film 30 are flush with the two sides of the laminated cell 20, so that the first insulating film 30 can completely cover the first large surface 21.

[0054] Furthermore, the middle part of the second insulating film 40 is bonded to the second large surface 23 of the laminated cell 20 through the third adhesive part, and the two side edges of the second insulating film 40 are bent toward the laminated cell 20 respectively, so as to be bonded to the two long side surfaces 22 of the laminated cell 20 through the third adhesive part.

[0055] In this embodiment, the width of the second insulating film 40 can be the same as the sum of the width of the first large surface 21 and the width of the two long side surfaces 22. When the second insulating film 40 is bonded to the two long side surfaces 22, the second insulating film 40 can also completely cover the two long side surfaces 22.

[0056] Furthermore, when the laminated battery cells 20 are assembled onto the cover plate 10, the two sides of the laminated battery cells 20 arranged along the width direction are flush with the two sides of the cover plate 10. Since the first insulating film 30 is bonded to the cover plate 10 through the second adhesive portion, when the width of the first insulating film 30 is greater than the width of the laminated battery cells 20, the edge of the first insulating film 30 will extend beyond the cover plate 10. In this case, to prevent the edge of the first insulating film 30 from being adhesive and bonding with other components, the second adhesive portion can be made to only partially cover the first insulating film 30. Specifically, the second adhesive portion can only cover the part of the first insulating film 30 that is in contact with the cover plate 10.

[0057] In practice, the first adhesive part, the second adhesive part, and the third adhesive part can all be adhesive structures formed by arranging and combining multiple adhesive strips in sequence.

[0058] Based on the specific structure of the battery in the foregoing embodiments, this utility model can also provide a battery assembly method. Taking the battery as an example, which includes a first insulating film 30 and a second insulating film 40, and the two sides of the first insulating film 30 and the second insulating film 40 respectively extend beyond the first large surface 21 and the second large surface 23, the assembly method may include the following steps:

[0059] Step 1: As Figure 11 and Figure 12 As shown, the first insulating film 30 is bonded to the cover plate 10;

[0060] Step 2: As Figure 13 As shown, the laminated battery cell 20 is placed on the first insulating film 30;

[0061] Step 3: As Figure 14 As shown, the second insulating film 40 is bonded to the laminated cell 20;

[0062] Step 4: The cover plate 10, the first insulating film 30, the laminated cell 20 and the second insulating film 40 are kept in a relatively fixed state and transferred and hot-pressed, so that the first large surface 21 and the second large surface 23 of the laminated cell 20 are pressed tightly with the first insulating film 30 and the second insulating film 40 respectively, while smoothing the first insulating film 30 and the second insulating film 40.

[0063] Step 5: As Figure 15 As shown, the portions of the first insulating film 30 and the second insulating film 40 that extend beyond the stacked cell 20 are bent so that the first insulating film 30 and the second insulating film 40 are attached to the long side 22 of the stacked cell 20, ensuring that the cell 20 is fully covered by the film.

[0064] It is understood that the assembly method involved in this embodiment adopts a process route of cover plate 10 - first insulating film 30 - stacked cell 20 - second insulating film 40 - hot pressing. During assembly, it can be completed in one step without the need to move the stacked cell 20 back and forth. This also improves the integration of the production equipment for stacked batteries, thereby increasing space utilization and reducing equipment costs. Furthermore, by providing adhesive portions on the first insulating film 30 and the second insulating film 40 to bond the insulating film to the stacked cell 20, the relative fixation between the stacked cell 20 and the insulating film can be ensured, resulting in good stability of the stacked cell 20. In addition, hot pressing the stacked cell 20 after bonding the first insulating film 30 and the second insulating film 40 to the surface of the stacked cell 20 ensures that the surface of the stacked cell 20 is flat and free of wrinkles and bubbles.

[0065] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this utility model without departing from the spirit and scope of this utility model. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A battery, characterized in that, Includes cover plate, laminated cells and first insulating film; The first insulating film is located on the side of the cover plate facing the stacked cell, and the stacked cell includes a first large surface and a second large surface opposite to each other, with the first large surface located on the side of the second large surface facing the cover plate; The first insulating film has a first adhesive portion on the side opposite to the cover plate. The first insulating film is bonded to and covers the first large surface of the laminated cell through the first adhesive portion. The coverage of the first adhesive portion on the first large surface is greater than or equal to 70%.

2. The battery according to claim 1, characterized in that, The first insulating film has a second adhesive portion on the side facing the cover plate, and the first insulating film is bonded to the cover plate through the second adhesive portion.

3. The battery according to claim 2, characterized in that, The adhesiveness of the first adhesive part is less than that of the second adhesive part.

4. The battery according to claim 1, characterized in that, The width of the first insulating film is greater than the width of the stacked battery cell. The portion of the first insulating film that extends beyond the first large surface is bonded to and covered by the first adhesive portion on the two long sides of the stacked battery cell arranged along the width direction.

5. The battery according to claim 4, characterized in that, The first insulating film is also bonded to and covered on the second large surface of the laminated cell via the first adhesive portion.

6. The battery according to claim 1, characterized in that, It also includes a second insulating film, which is located on the side of the stacked cell away from the cover plate; The second insulating film has a third adhesive portion on the side facing the laminated cell, and the second insulating film is bonded to and covers the second large surface of the laminated cell through the third adhesive portion.

7. The battery according to claim 6, characterized in that, The width of the first insulating film is greater than the width of the laminated cell, and the portion of the first insulating film that extends beyond the first large surface is bonded to the long side of the laminated cell through the first adhesive portion. and / or The width of the second insulating film is greater than the width of the laminated cell, and the portion of the second insulating film that extends beyond the second large surface is bonded to the long side of the laminated cell through the third adhesive portion.

8. The battery according to claim 7, characterized in that, The width of the first insulating film is greater than the width of the stacked battery cell, and the width of the second insulating film is equal to the width of the stacked battery cell; The portion of the first insulating film that extends beyond the first large surface is bonded to and covers the two long sides of the stacked battery cells arranged along the width direction by the first adhesive portion.

9. The battery according to claim 7, characterized in that, The width of the first insulating film is greater than the width of the stacked battery cell, and the width of the second insulating film is greater than the width of the stacked battery cell; The portion of the first insulating film extending beyond the first large surface is bonded to the two long side surfaces of the laminated battery cell arranged along the width direction via the first adhesive portion. The portion of the second insulating film extending beyond the second large surface is bonded to the two long side surfaces of the laminated battery cell arranged along the width direction via the third adhesive portion. The first and second insulating films cooperate to completely cover each of the long side surfaces; or The portion of the first insulating film extending beyond the first large surface is bonded to and covers one long side of the laminated cell via the first adhesive portion, and the portion of the second insulating film extending beyond the second large surface is bonded to and covers the other long side of the laminated cell via the third adhesive portion, wherein the one long side and the other long side are arranged along the width direction of the laminated cell.

10. The battery according to claim 7, characterized in that, The width of the first insulating film is equal to the width of the stacked battery cell, and the width of the second insulating film is greater than the width of the stacked battery cell; The portion of the second insulating film that extends beyond the second large surface is bonded to and covers the two long sides of the laminated cell arranged along the width direction by the third adhesive portion.

11. The battery according to any one of claims 7 to 10, characterized in that, The length of the first insulating film is equal to the length of the laminated battery cell, and the length of the second insulating film is equal to the length of the laminated battery cell.

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