Battery and method for manufacturing a battery

Abstract

The application relates to the technical field of batteries, and discloses a battery and a manufacturing method thereof. The battery comprises a battery shell, a battery cell arranged in the battery shell, the battery cell comprising a battery cell main body and a tab part, the tab part extending out from a side surface of the battery cell main body, a first insulating film covering at least part of the battery cell main body, and a second insulating film arranged independently of the first insulating film, the second insulating film covering an upper surface of the first insulating film and at least part of the tab part, the first insulating film being arranged between the battery cell main body and the second insulating film, so that the first insulating film and the second insulating film can realize insulation of the battery cell and the battery shell.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery and a method for manufacturing the battery. Background Technology

[0002] In related technologies, the battery cells are housed inside the battery casing. Due to the structural limitations of the cells and tabs, there is a risk of insulation failure between the cells and the battery casing. Summary of the Invention

[0003] This invention provides a battery and a method for manufacturing the battery, so as to improve the performance of the battery.

[0004] According to a first aspect of the present invention, a battery is provided, comprising:

[0005] Battery casing;

[0006] A battery cell is housed within a battery casing. The battery cell includes a cell body and tabs, with the tabs extending from the side of the cell body.

[0007] A first insulating film covers at least a portion of the cell body;

[0008] The second insulating film is disposed independently of the first insulating film. The second insulating film covers the upper surface of the first insulating film and covers at least a portion of the tab portion. The first insulating film is located between the cell body and the second insulating film.

[0009] The battery of this invention includes a battery casing, a battery cell, a first insulating film, and a second insulating film. The first insulating film covers at least a portion of the battery cell body, and the second insulating film is connected to the first insulating film and covers the electrode tabs, thereby enabling the first and second insulating films to insulate the battery cell and the battery casing. Since the second insulating film is independent of the first insulating film, its installation is convenient, improving battery assembly efficiency. Furthermore, connecting the second insulating film to the first insulating film ensures the installation stability of both films, guaranteeing reliable insulation of the battery cell and battery casing, thus improving battery safety.

[0010] According to a second aspect of the present invention, a method for manufacturing a battery is provided, comprising:

[0011] Weld at least two single-piece tabs to form a tab portion extending from the side of the cell body;

[0012] At least a portion of the battery cell body is covered by a first insulating film;

[0013] The tab is covered by a second insulating film, and the second insulating film is connected to the first insulating film.

[0014] The battery manufacturing method of this invention uses a first insulating film to cover at least a portion of the cell body, and a second insulating film to cover the tabs, and the second insulating film is connected to the first insulating film. This ensures the installation stability of the first and second insulating films, thereby ensuring reliable insulation of the cell and battery casing by the first and second insulating films, and thus improving the safety performance of the battery. Attached Figure Description

[0015] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

[0016] Figure 1 This is a schematic diagram of the structure of a battery according to an exemplary embodiment;

[0017] Figure 2 This is a partially exploded structural diagram of a battery according to an exemplary embodiment;

[0018] Figure 3 This is a schematic diagram of the internal structure of a battery according to an exemplary embodiment;

[0019] Figure 4 This is a schematic diagram of a partially enlarged internal structure of a battery according to an exemplary embodiment;

[0020] Figure 5 This is a partial structural schematic diagram of a battery according to an exemplary embodiment;

[0021] Figure 6 This is a partially enlarged structural diagram of a battery according to an exemplary embodiment;

[0022] Figure 7 This is a partial structural schematic diagram of a battery according to an exemplary embodiment;

[0023] Figure 8 This is a partial structural diagram of the second segment and cell of a battery according to an exemplary embodiment;

[0024] Figure 9 This is a partial structural schematic diagram of a battery's first insulating film and cell according to an exemplary embodiment;

[0025] Figure 10This is a schematic diagram of the structure of a first insulating film of a battery according to an exemplary embodiment;

[0026] Figure 11 This is a schematic flowchart illustrating a method for manufacturing a battery according to an exemplary embodiment.

[0027] The annotations in the attached figures are explained as follows:

[0028] 10. Battery casing; 11. First casing component; 12. Second casing component; 13. Recess; 20. Battery cell; 21. Battery cell body; 211. First surface; 212. Second surface; 22. Terminal tab; 221. First bending area; 222. Second bending area; 30. First insulating film; 31. First end; 32. Second end; 33. Body part; 34. Extension part; 40. Second insulating film; 41. First section; 42. Second section; 50. Third insulating film; 60. Adapter piece; 70. Terminal assembly. Detailed Implementation

[0029] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0030] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0031] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0032] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0033] One embodiment of the present invention provides a battery, please refer to... Figures 1 to 10 The battery includes: a battery casing 10; a battery cell 20 disposed within the battery casing 10, the battery cell 20 including a battery cell body 21 and a tab portion 22, the tab portion 22 extending from the side of the battery cell body 21; a first insulating film 30 covering at least a portion of the battery cell body 21; and a second insulating film 40 disposed independently of the first insulating film 30, the second insulating film 40 covering the upper surface of the first insulating film 30 and covering at least a portion of the tab portion 22, the first insulating film 30 being located between the battery cell body 21 and the second insulating film 40.

[0034] A battery according to one embodiment of the present invention includes a battery casing 10, a battery cell 20, a first insulating film 30, and a second insulating film 40. The first insulating film 30 covers at least a portion of the battery cell body 21. The second insulating film 40 is connected to the first insulating film 30 and covers the tab portion 22, thereby enabling the first insulating film 30 and the second insulating film 40 to insulate the battery cell 20 and the battery casing 10. Since the second insulating film 40 is set independently of the first insulating film 30, the installation of the first insulating film 30 and the second insulating film 40 can be facilitated, thereby improving the battery assembly efficiency. Furthermore, connecting the second insulating film 40 to the first insulating film 30 ensures the installation stability of the first insulating film 30 and the second insulating film 40, thereby ensuring reliable insulation of the battery cell 20 and the battery casing 10 by the first insulating film 30 and the second insulating film 40, and thus improving the safety performance of the battery.

[0035] It should be noted that the first insulating film 30 covers at least a portion of the cell body 21, and the second insulating film 40 covers the tab portion 22. The second insulating film 40 is connected to the first insulating film 30, thereby ensuring the stability of the arrangement of the first insulating film 30 and the second insulating film 40. This ensures that the first insulating film 30 reliably insulates the cell body 21 and the battery casing 10, and the second insulating film 40 reliably insulates the tab portion 22 and the battery casing 10.

[0036] The first insulating film 30 covers at least a portion of the cell body 21, while the second insulating film 40 covers the upper surface of the first insulating film 30, that is, the second insulating film 40 is located above the first insulating film 30, so that the first insulating film 30 is located between the cell body 21 and the second insulating film 40, thereby ensuring that the first insulating film 30 reliably covers the cell body 21.

[0037] The tabs 22 on the main body 21 of the battery cell are mostly formed by bending and folding. By providing a second insulating film 40 on the surface of the tabs 22, not only can the tabs 22 be insulated from the battery casing 10, but also, when the tabs 22 are bent and folded, the tooling can bend the second insulating film 40 to drive the tabs 22 to bend, which is convenient for constraining the tabs 22 and preventing warping and shedding of the tabs 22 during the bending process. This improves the assembly efficiency and yield of the battery and reduces the internal safety risks of the battery.

[0038] The second insulating film 40 is set independently of the first insulating film 30, meaning that the first insulating film 30 and the second insulating film 40 can be easily installed. This not only allows for effective control of the installation positions of the first insulating film 30 and the second insulating film 40, since smaller components are easier to install, but also avoids the problem of wrinkles in the structure of the first insulating film 30 and the second insulating film 40. This improves the installation efficiency of the first insulating film 30 and the second insulating film 40 and ensures the installation quality of the first insulating film 30 and the second insulating film 40.

[0039] In one embodiment, the first insulating film 30 may be a Mylar film. The second insulating film 40 may include PET tape or PI tape, etc., for example, the second insulating film 40 may be blue PET tape.

[0040] In one embodiment, the second insulating film 40 is provided with an adhesive layer, and the second insulating film 40 is bonded to the first insulating film 30, thereby ensuring a reliable connection between the second insulating film 40 and the first insulating film 30. This fixes the first insulating film 30 and prevents cracking of the first insulating film 30, which could lead to insulation failure of the battery cell body 21. The second insulating film 40 can be bonded to the tab portion 22 via the adhesive layer, and further, the second insulating film 40 can be bonded to the battery cell body 21 via the adhesive layer. The adhesive layer can be a colloid in related technologies, such as an adhesive or structural adhesive, etc.

[0041] In one embodiment, the first insulating film 30 is not provided with an adhesive layer, meaning the first insulating film 30 can cover the cell body 21. This facilitates the first insulating film 30 covering the cell body 21 and ensures that the first insulating film 30 can cover the cell body 21 smoothly, avoiding wrinkles caused by the adhesive layer. This ensures the flatness of the first insulating film 30 and the second insulating film 40 when they are subsequently connected, thereby improving the battery's packaging quality and ensuring its safety performance.

[0042] In one embodiment, the second insulating film 40 is partially adhered to the surface of the first insulating film 30 away from the cell body 21, and partially adhered to the surface of the cell body 21 not covered by the first insulating film 30. That is, the second insulating film 40 is partially adhered to the first insulating film 30 and partially adhered to the cell body 21. This can firmly fix the first insulating film 30 to the cell body 21, preventing relative displacement between the first insulating film 30 and the cell body 21, thereby avoiding direct contact between the cell body 21 and the battery casing 10 after exposure. The second insulating film 40 can also be used to achieve insulation protection between the battery casing 10 and the cell body 21.

[0043] In one embodiment, the first insulating film 30 includes a first end 31 and a second end 32 opposite to each other, and the second insulating film 40 connects the first end 31 and the second end 32, thereby realizing the connection between the first insulating film 30 and the second insulating film 40, and ensuring that the first insulating film 30 stably covers the battery cell body 21.

[0044] The first end 31 and the second end 32 can be directly connected. In some embodiments, the first end 31 and the second end 32 may be spaced apart, but the first insulating film 30 may have an overlapping portion, that is, one of the first end 31 and the second end 32 may be covered by the first insulating film 30.

[0045] In one embodiment, such as Figure 9 As shown, the first insulating film 30 includes a first end 31 and a second end 32 opposite to each other, with a gap formed between the first end 31 and the second end 32 to expose a portion of the battery cell body 21. The second insulating film 40 connects the first end 31 and the second end 32 and covers the gap, thereby allowing the second insulating film 40 to be partially adhered to the first insulating film 30 and the battery cell body 21, so as to firmly fix the first insulating film 30 to the battery cell body 21 and prevent relative displacement between the first insulating film 30 and the battery cell body 21.

[0046] Combination Figure 3As shown, the second insulating film 40 is connected to the first insulating film 30. Both ends of the second insulating film 40 can extend to the two tabs 22 respectively, thereby covering the tabs 22. In one embodiment, as... Figure 9 and Figure 10 As shown, the first insulating film 30 includes a main body 33 and an extension 34. The main body 33 covers a portion of the cell body 21, and the extension 34 extends from the end of the main body 33 along a first direction, extending beyond the cell body 21. This allows the extension 34 to provide insulation protection between the tab portion 22 and the battery casing 10, thereby improving the battery's safety performance. The second insulating film 40 is attached to the main body 33.

[0047] In one embodiment, the extension 34 extends from a portion of the end of the main body 33 such that the width of the extension 34 is smaller than the width of the main body 33. That is, there is a gap between the two ends of the extension 34 along the circumferential direction of the main body 33, which can reduce the size of the extension 34 without affecting the extension 34's ability to provide insulation protection between the tab 22 and the battery casing 10.

[0048] Combination Figure 9 and Figure 10 As shown, the extension 34 is roughly U-shaped and can provide insulation protection between the tab 22 and the battery casing 10.

[0049] The width of the main body 33 refers to the dimension of the end of the main body 33. Correspondingly, the width of the extension 34 refers to the length of the extension 34 connected to the end of the main body 33.

[0050] In some embodiments, it is not excluded that the extension 34 extends entirely from the end of the main body 33, such that the width of the extension 34 is equal to the width of the main body 33.

[0051] In one embodiment, such as Figures 3 to 7 As shown, the second insulating film 40 includes a first segment 41 and a second segment 42. The first segment 41 connects the first end 31 and the second end 32. The second segment 42 is connected to the first segment 41 and covers the tab portion 22. This allows the first segment 41 to be partially adhered to the first insulating film 30 and the battery cell body 21. This securely fixes the first insulating film 30 to the battery cell body 21, preventing relative displacement between the first insulating film 30 and the battery cell body 21. This avoids the battery cell body 21 from directly contacting the battery casing 10 after exposure. Furthermore, the second segment 42 provides insulation protection between the tab portion 22 and the battery casing 10.

[0052] It should be noted that the first segment 41 covers the main body 21 of the battery cell, and the second segment 42 covers the tab 22. The second segment 42 is connected to the first segment 41, which can ensure the stability of the arrangement of the first segment 41 and the second segment 42. This ensures that the first segment 41 provides reliable insulation to the main body 21 of the battery cell and the battery casing 10, and the second segment 42 provides reliable insulation to the tab 22 and the battery casing 10.

[0053] The tabs 22 on the main body 21 of the battery cell are mostly formed by bending and folding. By providing a second section 42 on the surface of the tab 22, not only can the tab 22 be insulated from the battery casing 10, but also the tooling can bend the second section 42 to bend the tab 22 when it is bent and folded. This makes it easier to constrain the tab 22 and prevent warping and chipping when the tab 22 is bent, thereby improving the assembly efficiency and yield of the battery and reducing the internal safety risks of the battery.

[0054] The battery cell 20 includes a cell body 21 and two tabs 22. The two tabs 22 can be located on opposite sides of the cell body 21. One tab 22 extends from one side of the cell body 21 along a first direction, and the other tab 22 extends from the other side of the cell body 21 along a second direction. The first and second directions are opposite. There can be two second segments 42, each covering one of the two tabs 22. Figure 3 and Figure 5 As shown.

[0055] In one embodiment, the first segment 41 can be PET tape or PI tape, etc. For example, the first segment 41 can be blue PET tape. The second segment 42 can be PET tape or PI tape, etc. For example, the second segment 42 can be blue PET tape.

[0056] In one embodiment, along the width direction of the cell body 21, the width of the second segment 42 is greater than the width of the first segment 41, and the second segment 42 is connected to the first segment 41, so that the first segment 41 can reliably cover the cell body 21, thereby ensuring that the first segment 41 and the second segment 42 achieve reliable insulation of the cell 20 and the battery casing 10, thereby improving the safety performance of the battery.

[0057] In one embodiment, the width of the second segment 42 is greater than the width of the tab 22 along the width direction of the cell body 21. This prevents the ends of the tab 22 from extending beyond the ends of the second segment 42 along the width direction of the cell body 21, ensuring that the ends of the tab 22 do not extend beyond the ends of the second segment 42. This achieves reliable coverage of the tab 22 by the second segment 42, thereby ensuring an insulating connection between the tab 22 and the battery casing 10, thus improving battery safety. The width direction of the cell body 21 is parallel to the width direction of the tab 22, and the width direction of the tab 22 is perpendicular to the direction in which the tab 22 extends from the side of the cell body 21.

[0058] In one embodiment, along the length of the cell body 21, the first segment 41 extends from one end of the first insulating film 30 to the other end of the first insulating film 30, thereby enabling the first segment 41 to reliably cover the first insulating film 30, so that the first insulating film 30 can reliably protect the cell body 21, thereby ensuring effective insulation between the battery casing 10 and the cell body 21.

[0059] In one embodiment, the width of the second insulating film 40 is greater than the width of the tab 22, and the width of the second insulating film 40 is less than the width of the cell body 21. While ensuring that the second insulating film 40 can reliably cover the tab 22, the problem of the second insulating film 40 being too wide and inconvenient to install can be avoided.

[0060] Along the direction perpendicular to the tab 22 extending from the side of the cell body 21, the tab 22 is sized as the width of the tab 22.

[0061] The width of the second segment 42 of the second insulating film 40 can be greater than the width of the tab 22, while the width of the second segment 42 of the second insulating film 40 can be less than the width of the cell body 21. The width of the first segment 41 can be less than the width of the cell body 21, while the width of the first segment 41 can be greater than the width of the second segment 42, or the width of the first segment 41 can be less than the width of the second segment 42.

[0062] In one embodiment, there are two tabs 22, which extend from opposite sides of the battery cell body 21. The second insulating film 40 extends from one tab 22 to the other tab 22, thereby improving the assembly efficiency of the second insulating film 40 and ensuring that the second insulating film 40 can reliably fix the first insulating film 30. Furthermore, it can ensure that the second insulating film 40 can provide reliable insulation protection for the two tabs 22.

[0063] It should be noted that the tab 22 can be used to connect to the terminal assembly. Since the tab 22 is mostly an exposed structure, if no other insulating structure is provided between the tab 22 and the battery casing 10, there is a risk of electrical connection between them. In this embodiment, by covering the tab 22 with the second segment 42 and ensuring that the two ends of the tab 22 do not extend beyond the two ends of the second segment 42, the second segment 42 can effectively ensure insulation between the tab 22 and the battery casing 10.

[0064] In one embodiment, the tab portion 22 includes two or more single tabs extending from the side of the cell body 21. The multiple single tabs are gathered together to form the tab portion 22, so as to form a first bending region 221 on the side of the tab portion 22 close to the cell body 21. The second segment 42 covers the first bending region 221 to ensure that the tab portion 22 is insulated from the battery casing 10. The second segment 42 can be used as a tool to bend the multiple single tabs to prevent warping and shedding when the multiple single tabs are gathered, thereby improving the battery assembly efficiency and yield and reducing the internal safety risks of the battery.

[0065] A second section 42 can cover the top of multiple individual electrode tabs. When the multiple individual electrode tabs are bundled and bent, the tooling can bend the second section 42, causing the multiple individual electrode tabs to bend as well. This facilitates the constraint of the multiple individual electrode tabs, preventing warping and chipping during bundling, thereby improving battery assembly efficiency and yield, and reducing internal battery safety risks. The multiple individual electrode tabs can form a shape similar to... Figure 7 and Figure 8 The first bending region 221 is shown.

[0066] It should be noted that the main body 21 of the battery cell includes two or more electrode plates, and the tab portion 22 includes two or more single-piece tabs. Each single-piece tab extends from its corresponding electrode plate, and the width of the single-piece tab can be smaller than the width of the electrode plate. Multiple single-piece tabs are stacked to form the tab portion 22. The single-piece tab is made of a metal foil with good electrical and thermal conductivity, such as aluminum, copper, or nickel.

[0067] In one embodiment, the second segment 42 extends 1mm-10mm beyond the tab 22 along the width direction of the cell body 21. This not only ensures reliable coverage of the tab 22 by the second segment 42, but also avoids problems such as inconvenience in installation caused by the second segment 42 being too long.

[0068] Along the width direction of the cell body 21, the length of the second segment 42 extending beyond the tab 22 can be 1mm, 1.1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 4.8mm, 4.9mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 9.8mm, 9.9mm, or 10mm, etc.

[0069] It should be noted that, along the width direction of the cell body 21, both ends of the second segment 42 can extend beyond the tab 22. Alternatively, along the width direction of the cell body 21, one end of the second segment 42 can extend beyond the tab 22, while the other end can be flush with the tab 22.

[0070] In one embodiment, such as Figure 7 and Figure 8 As shown, the tab portion 22 has a second bending region 222, which is located on the side of the first bending region 221 away from the cell body 21; wherein the first bending region 221 and the second bending region 222 are spaced apart. The formation of the second bending region 222 can reduce the length of the tab portion 22 along the length direction of the cell body 21, thereby reducing the space occupied by the tab portion 22 in the length direction. This not only saves internal space of the battery casing 10, but also avoids the end of the tab portion 22 from forming an electrical connection with the battery casing 10.

[0071] In one embodiment, such as Figure 7 and Figure 8 As shown, the second segment 42 also covers the second bending region 222, thereby ensuring that the second segment 42 does not form an electrical connection with the battery casing 10.

[0072] Considering that the second bending region 222 can be located at the farthest end of the cell length direction, the possibility of the second bending region 222 contacting the battery casing 10 will increase. By making the second segment 42 also cover the second bending region 222, the second segment 42 ensures reliable insulation between the second bending region 222 and the battery casing 10.

[0073] In one embodiment, the end of the second segment 42 away from the cell body 21 extends between the second bending region 222 and the end of the tab 22 away from the cell body 21. This not only ensures that the second segment 42 can reliably cover the second bending region 222, but also avoids the problems of the second segment 42 being too long, making installation inconvenient and increasing costs.

[0074] In one embodiment, the end of the second segment 42 away from the cell body 21 does not extend beyond the end of the tab 22 away from the cell body 21. That is, the length of the second segment 42 covering the tab 22 can be less than the length of the tab 22, which facilitates the setting of the second segment 42 and also ensures reliable insulation between the second segment 42 and the tab 22 and the battery casing 10.

[0075] In one embodiment, such as Figure 7 As shown, the battery also includes an adapter plate 60, which is disposed on the battery housing 10. A portion of the adapter plate 60 is covered by a tab portion 22. The tab portion 22 is bent at one end of the adapter plate 60 to form a second bending region 222, thereby ensuring that the tab portion 22 reliably covers a portion of the adapter plate 60 and increasing the contact area between the tab portion 22 and the adapter plate 60, thereby improving the current carrying capacity of the tab portion 22 and the adapter plate 60.

[0076] In one embodiment, the second segment 42 covers the side of the tab 22 away from the adapter piece 60, thereby ensuring that the second segment 42 can cover the tab 22, ensuring the insulation formation of the tab 22, and preventing the tab 22 from bending and generating metal shavings that could affect the overall safety of the battery.

[0077] Combination Figure 7 As shown, after the tab 22 extends from the side of the cell body 21, the tab 22 can be bent at one end of the adapter piece 60, so that the tab 22 covers the adapter piece 60, that is, a part of the tab 22 is located inside the adapter piece 60. At this time, the second segment 42 can cover at least the part of the tab 22 located below the adapter piece 60, thereby avoiding the generation of metal shavings when the tab 22 is bent, thereby improving the insulation performance of the second segment 42.

[0078] In one embodiment, such as Figure 7 As shown, the second segment 42 is connected to the cell body 21, which not only ensures the connection stability of the second segment 42, but also enables the second segment 42 to form insulation protection for the cell body 21.

[0079] In one embodiment, such as Figure 2 As shown, the battery cell body 21 includes two first surfaces 211 arranged opposite to each other and four second surfaces 212 arranged around the first surfaces 211. The area of ​​the first surfaces 211 is larger than the area of ​​the second surfaces 212. The second segment 42 is connected to the first surface 211 and covers the large surface of the electrode tab 22, so that the second segment 42 can reliably protect the electrode tab 22 and provide reliable insulation protection.

[0080] It should be noted that the two opposing first surfaces 211 are the large surfaces of the cell body 21, while the four second surfaces 212 are the small surfaces of the cell body 21. The four second surfaces 212 include two pairs of small surfaces: a first pair of small surfaces extending along the length direction of the cell body 21, and a second pair of small surfaces extending along the width direction of the cell body 21. The area of ​​the first pair of small surfaces is larger than the area of ​​the second pair of small surfaces, but both are smaller than the area of ​​the large surfaces. The two tabs 22 can extend from the second pair of small surfaces respectively.

[0081] Correspondingly, the battery casing 10 may also include two large surfaces and four small surfaces, with the two large surfaces of the battery casing 10 and the two large surfaces of the battery cell body 21 arranged opposite to each other, and the four small surfaces of the battery casing 10 and the four small surfaces of the battery cell body 21 arranged opposite to each other.

[0082] When the individual tabs of the tab portion 22 are flattened, the individual tabs are parallel to the first surface 211, and the second segment 42 covers the tab portion 22, thereby enabling the second segment 42 to effectively provide insulation protection between the tab portion 22 and the battery casing 10.

[0083] In one embodiment, the second segment 42 is independently configured from the first segment 41. The second segment 42 is connected to the upper surface of the first segment 41. Along the width direction of the cell body 21, the width of the second segment 42 is 5mm-20mm longer than the width of the first segment 41. This is to prevent the two ends of the first segment 41 from extending beyond the two ends of the second segment 42 along the width direction of the cell body 21. This allows the second segment 42 to reliably press against the first segment 41, thereby ensuring the connection stability of the first segment 41. Furthermore, the length of the second segment 42 will not be too long, thus avoiding increased costs.

[0084] Along the width direction of the main body 21 of the battery cell, the width of the second segment 42 is 5mm, 6mm, 7mm, 10mm, 12mm, 15mm, 16mm, 18mm, 19mm or 20mm longer than the width of the first segment 41, etc.

[0085] In one embodiment, the second segment 42 and the first segment 41 are integrally formed, thereby allowing the second insulating film 40 to cover the tab 22 and the first insulating film 30 at one time, thus improving the installation efficiency of the second insulating film 40.

[0086] In one embodiment, the second segment 42 is set independently from the first segment 41, and the second segment 42 covers part of the first segment 41, so that the second segment 42 and the first segment 41 can be connected, and the second segment 42 and the first segment 41 can be installed independently, thereby improving the installation accuracy of the second segment 42 and the first segment 41.

[0087] In one embodiment, the second segment 42 also covers the surface of the cell body 21 that is not covered by the first insulating film 30 and the first segment 41, thereby enabling the second segment 42 to connect the first insulating film 30, the cell body 21 and the tab 22 simultaneously, thus ensuring the connection stability of the second segment 42 and improving the insulation protection range of the second segment 42.

[0088] In one embodiment, such as Figure 2 As shown, the battery cell body 21 includes two first surfaces 211 disposed opposite to each other and four second surfaces 212 disposed around the first surfaces 211. The area of ​​the first surfaces 211 is larger than the area of ​​the second surfaces 212. The first insulating film 30, the first segment 41, and the second segment 42 cover the same first surface 211. The first end 31 and the second end 32 of the first insulating film 30 are located on the first surface 211. In order to ensure that the first segment 41 can be connected to the first end 31 and the second end 32, and that the first segment 41 covers the surface of the battery cell body 21, the gap between the first end 31 and the second end 32 can be relatively large. This ensures the connection stability of the first segment 41 and ensures that the second segment 42 can cover the large surface of the tab 22, thereby ensuring that the second segment 42 can provide reliable insulation protection between the tab 22 and the battery casing 10.

[0089] In one embodiment, the first segment 41 covers a portion of the first surface 211; wherein the area of ​​the first segment 41 covering the first surface 211 is no more than half the area of ​​the first surface 211. This ensures that the first segment 41 can fix the first insulating film 30 while avoiding the first segment 41 being too large, which would increase costs. It also facilitates the setting of the first segment 41, thereby improving installation efficiency.

[0090] In one embodiment, such as Figures 3 to 5 As shown, the battery also includes a third insulating film 50, which covers a first surface 211 and two adjacent second surfaces 212. That is, the third insulating film 50 can cover the corner area of ​​the cell body 21, i.e. the corner area of ​​the cell body 21, thereby ensuring the protection of the corner area of ​​the cell body 21 by the third insulating film 50, thereby improving the insulation performance between the cell body 21 and the battery casing 10.

[0091] In one embodiment, such as Figure 3 and Figure 4As shown, the first insulating film 30 covers a portion of the third insulating film 50, and the second insulating film 40 is bonded to the surface of the first insulating film 30 covering the first surface 211. This allows the first insulating film 30 to fix the third insulating film 50, ensuring that the third insulating film 50 can reliably protect the corner area of ​​the battery cell body 21. The third insulating film 50 can be PET tape or PI tape, etc. For example, the third insulating film 50 can be blue PET tape.

[0092] In one embodiment, such as Figure 1 and Figure 2 As shown, the battery also includes: a terminal assembly 70, which is connected to an adapter piece 60, with a portion of the terminal assembly 70 located outside the battery housing 10; wherein, the terminal assembly 70 is disposed on the large surface of the battery housing 10, thereby allowing the large surface of the battery housing 10 to provide sufficient support for the terminal assembly 70, thus ensuring the stability of the terminal assembly 70. The terminal assembly 70 is connected to the adapter piece 60, which is connected to the tab portion 22, thereby allowing the terminal assembly 70 to serve as the electrode lead-out end of the battery. The terminal assembly 70 and the adapter piece 60 can be welded, or the terminal assembly 70 and the adapter piece 60 can be riveted.

[0093] In some embodiments, there are two terminal post assemblies 70, which are a positive terminal post assembly and a negative terminal post assembly, respectively. Each terminal post assembly 70 may include two terminals to increase the overcurrent capacity of the battery. There are also two tabs 22, which are a positive tab and a negative tab, respectively. The positive terminal post assembly and the positive tab are connected together, and the negative terminal post assembly and the negative tab are connected together.

[0094] It should be noted that the terminal assembly 70 and the battery housing 10 can be insulated from each other. For example, they can be insulated with insulating materials or with insulating coatings. There are no limitations here, and the choice can be made according to actual needs.

[0095] In one embodiment, a recess 13 is provided on the battery housing 10, and the terminal assembly 70 is located in the recess 13, thereby avoiding the terminal assembly 70 from occupying the battery pack stacking space, thereby improving the energy density of the battery pack.

[0096] In one embodiment, such as Figure 1 As shown, a recess 13 is provided on the battery housing 10. The terminal assembly 70 and the recess 13 are located on opposite surfaces of the battery housing 10. The recess 13 is used to accommodate the terminal assembly of another battery. Thus, when the batteries are assembled, the terminal assembly of another battery can be accommodated in the recess 13, thereby avoiding the terminal assembly from occupying the space between the two batteries, reducing the distance between two adjacent batteries, and thus improving the energy density of the battery pack.

[0097] In one embodiment, such as Figure 1 and Figure 2 As shown, there can be two terminal post assemblies 70 and two recesses 13. The two terminal post assemblies 70 can be disposed on the same large surface of the battery housing 10, while the two recesses 13 can be disposed on another large surface of the battery housing 10.

[0098] In one embodiment, such as Figure 2 As shown, the battery casing 10 includes: a first casing member 11; a second casing member 12, the second casing member 12 being connected to the first casing member 11 to enclose the battery cell 20; wherein, the first casing member 11 is a flat plate.

[0099] In one embodiment, the terminal assembly 70 can be disposed on the first housing member 11, which is a flat plate. This not only simplifies the structure but also facilitates the placement of the terminal assembly 70, thereby improving the battery forming efficiency.

[0100] In one embodiment, the battery casing 10 may be made of stainless steel or aluminum, which has good corrosion resistance and sufficient strength. The battery casing 10 is generally rectangular.

[0101] It should be noted that the first housing component 11 and the second housing component 12 can be set independently, such as... Figure 2 As shown. In some embodiments, it is not excluded that the first housing member 11 and the second housing member 12 can be an integral structure, formed by stamping to accommodate the battery cell 20, and then sealed by welding.

[0102] In one embodiment, the length of the battery is a, 400mm≤a≤2800mm, the width of the battery is b, the height of the battery is c, 2b≤a≤80b, and / or, 0.5c≤b≤20c.

[0103] Furthermore, 80mm≤b≤200mm, 10mm≤c≤100mm.

[0104] Preferably, 4b≤a≤25b, and / or 2c≤b≤10c.

[0105] In the above embodiments, the battery has a large length-to-width ratio while ensuring sufficient energy density, and further, a large width-to-height ratio.

[0106] In one embodiment, the length of the battery is 'a' and the width of the battery is 'b', where 4b ≤ a ≤ 7b. That is, the ratio of the battery length to its width in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack.

[0107] In one embodiment, the height of the battery is c, where 3c≤b≤7c. The ratio of the battery width to its height is relatively large, which facilitates its formation while ensuring sufficient energy density.

[0108] Optionally, the battery length can be 800mm-1800mm, the battery width can be 80mm-180mm, and the battery height can be 15mm-35mm.

[0109] It should be noted that the length of the battery is the dimension along its length, the width of the battery is the dimension along its width, and the height of the battery is the dimension along its height, i.e., the thickness of the battery.

[0110] In one embodiment, the battery is a stacked battery, which is not only convenient to assemble, but also allows for the processing of batteries with longer lengths.

[0111] A battery consists of a cell and an electrolyte, and is the smallest unit capable of electrochemical reactions such as charging and discharging. A cell is a unit formed by winding or laminating stacked portions, including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. The polarities of the first and second electrodes can be interchanged.

[0112] Specifically, the cell 20 is a stacked cell, which has a first electrode layered on top of each other, a second electrode layer with the opposite electrical charge to the first electrode layer, and a separator layer disposed between the first electrode layer and the second electrode layer, so that multiple pairs of first electrode layers and second electrode layers are stacked to form a stacked cell.

[0113] Optionally, the battery can be a wound battery, which involves winding a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator disposed between the first and second electrodes to obtain a wound battery cell.

[0114] An embodiment of the present invention also provides a battery pack comprising the aforementioned battery.

[0115] A battery pack according to one embodiment of the present invention includes a battery casing 10, a battery cell 20, a first insulating film 30, and a second insulating film 40. The first insulating film 30 covers at least a portion of the battery cell body 21. The second insulating film 40 is connected to the first insulating film 30 and covers the tab portion 22, thereby enabling the first insulating film 30 and the second insulating film 40 to insulate the battery cell 20 and the battery casing 10. Since the second insulating film 40 is set independently of the first insulating film 30, the installation of the first insulating film 30 and the second insulating film 40 can be facilitated, thereby improving the battery assembly efficiency. Furthermore, connecting the second insulating film 40 to the first insulating film 30 ensures the installation stability of the first insulating film 30 and the second insulating film 40, thereby ensuring reliable insulation of the battery cell 20 and the battery casing 10 by the first insulating film 30 and the second insulating film 40, and thus improving the safety performance of the battery pack.

[0116] In one embodiment, the battery pack is a battery module or a battery pack.

[0117] The battery module includes multiple batteries, and may also include end plates and side plates for fixing the multiple batteries.

[0118] It should be noted that multiple batteries can be assembled into a battery module and then installed inside the battery box. These batteries can be secured using end plates and side plates. Alternatively, multiple batteries can be directly installed inside the battery box without needing to be grouped together; in this case, the end plates and side plates can be removed.

[0119] An embodiment of the present invention also provides a method for manufacturing a battery; please refer to [reference needed]. Figure 11 The battery manufacturing methods include:

[0120] S101, weld at least two single-piece tabs to form a tab portion 22 extending from the side of the cell body 21;

[0121] S103, at least a portion of the battery cell body 21 is covered by the first insulating film 30;

[0122] S105, the second insulating film 40 is used to cover the tab portion 22, and the second insulating film 40 is connected to the first insulating film 30, so that the second insulating film 40 covers the upper surface of the first insulating film 30, and the first insulating film 30 is located between the cell body 21 and the second insulating film 40.

[0123] In one embodiment of the present invention, the battery manufacturing method involves covering at least a portion of the cell body 21 with a first insulating film 30 and covering the tab portion 22 with a second insulating film 40, and connecting the second insulating film 40 to the first insulating film 30. This ensures the installation stability of the first insulating film 30 and the second insulating film 40, thereby ensuring reliable insulation of the cell 20 and the battery casing 10 by the first insulating film 30 and the second insulating film 40, and thus improving the safety performance of the battery.

[0124] In one embodiment, after welding the tab 22 extending from the side of the cell body 21, the tab 22 is covered with a second insulating film 40 and connected to the first insulating film 30. This allows the second insulating film 40 to encapsulate the metal shavings generated during welding and bending of the tab 22, thereby preventing the metal shavings from causing electrical connection analysis of the battery and thus improving the battery's safety performance.

[0125] In one embodiment, after covering a portion of the cell body 21 with the first insulating film 30, a tab 22 extending from the side of the cell body 21 is welded. The tab 22 may be formed by multiple monolithic tabs.

[0126] The electrode tab 22 can be welded to multiple single electrode tabs, or the electrode tab 22 can be welded to the adapter piece 60.

[0127] In one embodiment, the second insulating film 40 is bonded and extended from the tab 22 to the first insulating film 30, thereby improving the installation efficiency of the second insulating film 40 and simplifying the installation steps of the second insulating film 40.

[0128] The second insulating film 40 extends from the tab 22 to the first insulating film 30. It can be considered that the first segment 41 and the second segment 42 are integrally formed structures, so that the second insulating film 40 can cover the tab 22 and the first insulating film 30 at one time, thereby improving the installation efficiency of the second insulating film 40.

[0129] In one embodiment, the second insulating film 40 is bonded and extended from one tab 22 to the other tab 22, thereby improving the assembly efficiency of the second insulating film 40 and ensuring that the second insulating film 40 can reliably fix the first insulating film 30. Furthermore, it ensures that the second insulating film 40 can provide reliable insulation protection for the two tabs 22. The second insulating film 40 has an integrally molded structure, which facilitates its installation.

[0130] In one embodiment, the second insulating film 40 includes a first segment 41 and a second segment 42 that are independently disposed. The first segment 41 and the second segment 42 are sequentially assembled. For example, the first segment 41 is bonded to the first insulating film 30, and the second segment 42 is bonded to the tab portion 22, such that the second segment 42 is connected to the first segment 41.

[0131] In one embodiment, the battery manufacturing method further includes: before covering a portion of the cell body 21 with the first insulating film 30, covering the corner areas of the cell body 21 with the third insulating film 50; wherein the first insulating film 30 covers the third insulating film 50, thereby enabling the first insulating film 30 to fix the third insulating film 50, ensuring that the third insulating film 50 can reliably protect the corner areas of the cell body 21.

[0132] In one embodiment, the method of manufacturing the battery further includes welding the terminal assembly 70 and the terminal adapter 60.

[0133] In one embodiment, the battery manufacturing method is used to form the battery described above.

[0134] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0135] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that, include: Battery casing (10); The battery cell (20) is disposed inside the battery casing (10). The battery cell (20) includes a battery cell body (21) and a tab (22). The tab (22) extends from the side of the battery cell body (21). The battery cell body (21) includes two first surfaces (211) disposed opposite to each other and four second surfaces (212) disposed around the first surfaces (211). The area of ​​the first surfaces (211) is larger than the area of ​​the second surfaces (212). A first insulating film (30) covers at least a portion of the cell body (21); The second insulating film (40) is disposed independently of the first insulating film (30). The second insulating film (40) covers the upper surface of the first insulating film (30) and covers at least a portion of the tab portion (22). The width of the second insulating film (40) is greater than the width of the tab portion (22). The second insulating film (40) provides insulation between the tab portion (22) and the battery casing (10). The first insulating film (30) is located between the cell body (21) and the second insulating film (40). There are two electrode tabs (22), and the two electrode tabs (22) extend from opposite sides of the battery cell body (21); The second insulating film (40) extends from one of the tabs (22) to the other tab (22). The first insulating film (30) includes a first end (31) and a second end (32) opposite to each other. The second insulating film (40) connects the first end (31) and the second end (32). The second insulating film (40) includes a first segment (41) and a second segment (42). The first segment (41) connects the first end (31) and the second end (32). The second segment (42) is connected to the first segment (41) and covers the tab (22). The first insulating film (30), the first segment (41) and the second segment (42) cover the same first surface (211).

2. The battery according to claim 1, characterized in that, The second insulating film (40) is partially adhered to the surface of the first insulating film (30) away from the cell body (21), and partially adhered to the surface of the cell body (21) not covered by the first insulating film (30).

3. The battery according to claim 1, characterized in that, A gap is formed between the first end (31) and the second end (32) to expose a portion of the cell body (21), and the second insulating film (40) covers the gap.

4. The battery according to claim 1, characterized in that, The second segment (42) and the first segment (41) are integrally formed structures.

5. The battery according to claim 4, characterized in that, Along the length of the cell body (21), the first segment (41) extends from one end of the first insulating film (30) to the other end of the first insulating film (30).

6. The battery according to claim 4, characterized in that, The second segment (42) also covers the surface of the cell body (21) that is not covered by the first insulating film (30) and the first segment (41).

7. The battery according to claim 6, characterized in that, The battery also includes a third insulating film (50) that simultaneously covers one of the first surfaces (211) and two adjacent second surfaces (212).

8. The battery according to claim 7, characterized in that, The first insulating film (30) covers a portion of the third insulating film (50), and the second insulating film (40) is bonded to the surface of the first insulating film (30) covering the first surface (211).

9. The battery according to any one of claims 1 to 8, characterized in that, The second insulating film (40) is provided with an adhesive layer, and the second insulating film (40) is bonded to the first insulating film (30).

10. The battery according to claim 9, characterized in that, The first insulating film (30) does not have an adhesive layer.

11. The battery according to any one of claims 1 to 8, characterized in that, The width of the second insulating film (40) is smaller than the width of the cell body (21).

12. A method for manufacturing a battery, characterized in that, include: At least two single-piece tabs are welded to form tab portions (22) extending from the side of the cell body (21). There are two tab portions (22), and the two tab portions (22) extend from opposite sides of the cell body (21). The cell body (21) includes two first surfaces (211) arranged opposite to each other and four second surfaces (212) arranged around the first surfaces (211). The area of ​​the first surface (211) is larger than the area of ​​the second surface (212). At least a portion of the battery cell body (21) is covered by a first insulating film (30); The tab portion (22) is covered by a second insulating film (40), and the second insulating film (40) is connected to the first insulating film (30). The width of the second insulating film (40) is greater than the width of the tab portion (22). The second insulating film (40) provides insulation between the tab portion (22) and the battery casing (10). The second insulating film (40) extends from one tab portion (22) to the other tab portion (22). The first insulating film (30) includes a first end (31) and a second end (32) opposite to each other. The second insulating film (40) connects the first end (31) and the second end (32). The second insulating film (40) includes a first segment (41) and a second segment (42). The first segment (41) connects the first end (31) and the second end (32). The second segment (42) is connected to the first segment (41) and covers the tab portion (22). The first insulating film (30), the first segment (41) and the second segment (42) cover the same first surface (211).

13. The method for manufacturing a battery according to claim 12, characterized in that, The second insulating film (40) extends from the tab portion (22) to the first insulating film (30).

14. The method for manufacturing a battery according to claim 12 or 13, characterized in that, Also includes: Before covering part of the cell body (21) with the first insulating film (30), The corner areas of the battery cell body (21) are covered by a third insulating film (50); The first insulating film (30) covers the third insulating film (50).

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