Soft package battery cell and electric vehicle

Abstract

The utility model discloses a soft package battery cell, which comprises a naked battery cell and an external shell, the external shell is coated outside the naked battery cell, the external shell comprises a seal area positioned at the edge of the soft package battery cell, the seal area comprises a top seal, the top seal comprises a seal protruding area, and the seal protruding area is arranged along the width direction of the top seal. The width of the seal protruding area is larger than that of other positions of the top seal, and the seal protruding area is used for spraying codes. According to the utility model, the problem of low code scanning success rate caused by the fact that code jet printing exceeds a sealing area is solved, and the code jet printing effect and precision are improved. The utility model further discloses an electric vehicle.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a soft-pack battery cell and an electric vehicle. Background Art

[0002] The codes for soft-pack lithium batteries are typically sprayed in two locations: 1) the surface of the battery cell and 2) the top seal. The advantage of spraying the codes on the cell surface is a large area, resulting in a high scan success rate. However, the disadvantage is that during the module assembly process, glue or foam is used to bond the battery cell, soaking it in silicone oil, making the codes easily lost and hindering traceability. The advantage of spraying the codes on the top seal is that they are not affected by the module assembly, facilitating traceability. However, the disadvantage is that the seal is narrow, and the coding is affected by positioning accuracy, making it easy to extend beyond the seal, resulting in a low scan success rate. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a soft-pack battery cell and an electric vehicle to solve the problem of low scanning success rate caused by code printing exceeding the sealing area, and to improve the coding effect and accuracy.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A soft-pack battery cell comprises a bare battery cell and an external shell, wherein the external shell is coated on the bare battery cell, the external shell comprises a sealing area located at the edge of the soft-pack battery cell, the sealing area comprises a top seal, the top seal comprises a seal protruding area, along the width direction of the top seal, the width of the seal protruding area is greater than the width of other positions of the top seal, and the seal protruding area is used for spraying a code.

[0006] In one embodiment, the width of the top seal is equal at all other locations outside the seal protrusion area.

[0007] In one embodiment, along the length direction of the top seal, the top seal includes a first sealing area, a second sealing area, and a third sealing area connected in sequence, and the seal protrusion area is the second sealing area of ​​the top seal.

[0008] In one embodiment, the pouch cell further includes two tabs, which are respectively fixed to the first sealing area and the third sealing area.

[0009] In one embodiment, the width of the first sealing area is 4 / 11 to 10 / 11 of the width of the second sealing area, and / or the width of the third sealing area is 4 / 11 to 10 / 11 of the width of the second sealing area.

[0010] In one embodiment, the width of both the first sealing area and the third sealing area is 4-10 mm.

[0011] In one embodiment, the width of the second sealing area is 5-11 mm.

[0012] In one embodiment, the second sealing area is connected to the first sealing area by a chamfer, and / or the second sealing area is connected to the third sealing area by a chamfer.

[0013] In one embodiment, the radius of the chamfer is 1-4 mm.

[0014] The utility model also provides an electric vehicle, comprising the soft-pack battery cell as described above.

[0015] The beneficial effects of this utility model are as follows: By setting a raised sealing area on the top seal of the soft-pack battery cell, the width of the raised sealing area is greater than the width of other positions on the top seal. When coding is applied at the position of the raised sealing area, because the width of the seal is wider than that of a conventional seal, the coding position will not exceed the sealing range when it deviates, thus improving the coding error tolerance and increasing the scanning recognition capability. In terms of sealing effect, the heat-sealing width of the raised sealing area is wider than that of a conventional seal, resulting in higher sealing pull and better sealing effect. Attached Figure Description

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a coding effect diagram of a soft-pack battery cell in the prior art;

[0018] Figure 2 This is a diagram showing the inkjet printing effect of a soft-pack battery cell according to an embodiment of this utility model;

[0019] Figure 3 yes Figure 2 Structural diagram of the top seal;

[0020] Figure 4 yes Figure 3 A magnified view of a portion at point A;

[0021] Figure 5 yes Figure 1 Diagram of the structure of a conventional top seal.

[0022] In the figure: 1-external shell, 11-sealing area, 111-top seal, 11a-seal protruding area, 11A-first seal area, 11B-second seal area, 11C-third seal area, 112-side seal, 2-bare cell, 3-ear, 4-code, 5-conventional top seal. DETAILED DESCRIPTION

[0023] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the description of the present invention, all other embodiments derived by persons of ordinary skill in the art without inventive effort are also within the scope of protection of the present invention.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to 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 according to the specific circumstances.

[0025] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0027] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0028] This utility model provides a soft-pack battery cell, such as Figure 2As shown, the device includes a bare battery cell 2 and an outer casing 1. The outer casing 1 covers the bare battery cell 2 and includes a sealing area 11 located at the edge of the soft-pack battery cell. The sealing area 11 includes a top seal 111 and a sealing protrusion 11a. Along the width direction W of the top seal 111, the width of the sealing protrusion 11a is greater than the width of other parts of the top seal 111. The sealing protrusion 11a is used to spray code 4, which can be a national standard code. The outer casing 1 is usually made of aluminum-plastic film. Generally, the sealing area 11 of the outer casing 1 includes a top seal 111 and two side seals 112, and the soft-pack battery cell is sealed by heat-pressing the sealing head. This invention provides a raised sealing area 11a on the top seal 111 of the soft-pack battery cell. The width of the raised sealing area 11a is greater than the width of other parts of the top seal 111. When code 4 is printed at the location of the raised sealing area 11a, because the width of the seal is wider than that of a conventional seal, the printing position will not exceed the sealing range when it deviates, thus improving the error tolerance of the printing and increasing the scanning recognition capability. In terms of sealing effect, the heat-sealing width of the raised sealing area 11a is wider than that of a conventional seal, resulting in higher sealing pull and better sealing effect.

[0029] Specifically, if Figure 1 and Figure 5 As shown, when code 4 is printed on the conventional top seal 5, the width of the conventional top seal 5 for the pouch cell is consistent throughout. The width of the conventional top seal 5 for the pouch cell is 4-7mm, and the QR code size of code 4 is controlled within 3-6mm, requiring that the QR code of code 4 cannot exceed the area of ​​the conventional top seal 5. Because the width of the conventional top seal 5 is consistent, the printing position of code 4 is relatively narrow; however, due to the positioning accuracy of the pouch cell (±0.5-±1.5mm) and the accuracy of the printing position, code 4 often exceeds the seal, causing code 4 to be unrecognizable, reducing the production line yield. The printing effect of the conventional top seal 5 is as follows: Figure 1 As shown. Therefore, in this solution, as Figure 3 As shown, by setting a raised sealing area 11a, the sealing width at this location is wider than the conventional sealing width, improving the error tolerance of the inkjet printing and increasing the scanning and recognition capabilities; the inkjet printing effect of this embodiment is as follows. Figure 2 As shown, the width of the seal position of inkjet code 4 is wider than that of a regular seal position, reducing the possibility of exceeding the seal.

[0030] As one implementation method, such as Figure 3 As shown, the width of the top seal 111 is equal at other locations outside the seal protrusion area 11a. Compared with conventional soft-pack cells, the structural improvement is small. Therefore, a small modification to the conventional end cap can adapt to the top sealing operation of the soft-pack cell in this embodiment, thereby improving production efficiency and reducing production costs.

[0031] As one implementation method, such as Figure 3 As shown, along the length direction L of the top seal 111, the top seal 111 includes a first sealing area 11A, a second sealing area 11B and a third sealing area 11C connected in sequence, and the sealing protrusion area 11a is the second sealing area 11B of the top seal 111. Specifically, the tabs 3 of a typical soft-pack battery cell are located on both sides of the top seal position, leaving the middle of the top seal position as the tabless area, suitable for printing code 4. In this embodiment, the second sealing area 11B is a sealing protrusion area 11a, located between the first sealing area 11A and the third sealing area 11C. The first sealing area 11A and the third sealing area 11C are mainly used for imprinting and fixing the tabs 3, while the second sealing area 11B is mainly used for printing code 4. The second sealing area 11B is wider, which can improve the error tolerance of the printing code. Furthermore, the area for printing code 4 does not overlap with the area for imprinting the tabs 3, preventing the code 4 from being unclear when it is printed on the area of ​​the imprinted tabs 3 when the area of ​​the imprinted tabs 3 is uneven, which could lead to scanning obstruction. By avoiding the overlap between the area for printing code 4 and the area for imprinting the tabs 3, this problem can be effectively solved. Of course, when the tab 3 is located at the side sealing position of the pouch cell, the sealing protrusion 11a can be located at any position of the top seal 111, such as on both sides of the top seal 111; or, when the two tabs 3 are located on one side of the top sealing position of the pouch cell, the sealing protrusion 11a can be located on the other side of the top sealing position of the pouch cell.

[0032] As one implementation method, such as Figure 2 As shown, the pouch cell also includes two tabs 3, which are fixed to the first sealing area 11A and the third sealing area 11C, respectively. One end of the tab 3 is connected to the bare cell 2, and the other end passes through the top seal 111 and protrudes outside the pouch cell for electrical connection. One tab 3 is heat-pressed to the first sealing area 11A, and the other tab 3 is heat-pressed to the third sealing area 11C, separate from the second sealing area 11B of the inkjet printing area, to avoid uneven printing of the tab 3 and affecting the inkjet printing effect.

[0033] As one implementation method, such as Figure 3 As shown, the width W1 of the first sealing area 11A is 4 / 11 to 10 / 11 of the width W2 of the second sealing area 11B, and / or the width W3 of the third sealing area 11C is 4 / 11 to 10 / 11 of the width W2 of the second sealing area 11B.

[0034] As one implementation method, such as Figure 3 As shown, the width W1 of the first sealing area 11A and the width W3 of the third sealing area 11C are both 4-10mm; or, the width W1 of the first sealing area 11A and the width W3 of the third sealing area 11C are both 5-7mm.

[0035] As one implementation method, such as Figure 3As shown, the width W2 of the second sealing area 11B is 5-11mm; or, the width W2 of the second sealing area 11B is 6-8mm.

[0036] As one implementation method, such as Figure 4 As shown, the second sealing area 11B is connected to the first sealing area 11A by a chamfer R, and / or the second sealing area 11B is connected to the third sealing area 11C by a chamfer R. During sealing, the head is made of metal. By setting the chamfer R transition, the corresponding position of the head is required to be chamfered, which can avoid the problem of the connection being too sharp and easily scratching the external shell 1 (aluminum-plastic film).

[0037] As one implementation method, such as Figure 4 As shown, the radius of the chamfer R is 1-4mm or 2-3mm.

[0038] The present invention also provides an electric vehicle comprising the soft-pack battery cell described above. Specifically, the electric vehicle comprises a plurality of stacked soft-pack battery cells; of course, the electric vehicle may also comprise only one soft-pack battery cell.

[0039] The beneficial effects of the utility model are as follows:

[0040] 1. In terms of encapsulation effect, the width of the first sealing area 11A and the third sealing area 11C of this soft-pack battery cell is the same as that of the conventional top seal 5 of a conventional soft-pack battery cell. The width of the tab 3 is not affected and no additional modifications are required.

[0041] 2. In terms of encapsulation effect, the heat-sealing width of the second sealing area 11B of this soft-pack battery cell is wider than the heat-sealing width of the conventional top seal 5 of a conventional soft-pack battery cell, resulting in higher encapsulation pull force and better sealing effect.

[0042] 3. In the recognition of code 4, the heat-sealed width of the second sealing area 11B of the soft-pack battery cell is wider. Even if the coding position is offset, it will not exceed the sealing range, which improves the fault tolerance of coding and increases the ability of code scanning and recognition.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content without departing from the scope of the technical solution of the present utility model. These are equivalent embodiments with equivalent changes. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A soft-pack battery cell, comprising a bare battery cell (2) and an external shell (1), wherein the external shell (1) is wrapped around the bare battery cell (2), the external shell (1) comprises a sealing area (11) located at the edge of the soft-pack battery cell, the sealing area (11) comprises a top seal (111), characterized in that: The top seal (111) comprises a seal protruding area (11a). Along the width direction (W) of the top seal (111), the width of the seal protruding area (11a) is greater than the width of other positions of the top seal (111). The seal protruding area (11a) is used for spraying a code (4).

2. The soft-pack battery cell according to claim 1, characterized in that: Outside the seal protruding area (11a), the widths of other positions of the top seal (111) are all equal.

3. The soft-pack battery cell according to claim 1 or 2, characterized in that: Along the length direction (L) of the top seal (111), the top seal (111) comprises a first sealing area (11A), a second sealing area (11B) and a third sealing area (11C) which are connected in sequence, and the seal protruding area (11a) is the second sealing area (11B) of the top seal (111).

4. The soft-pack battery cell according to claim 3, characterized in that: The soft-pack battery cell further comprises two pole tabs (3), and the two pole tabs (3) are respectively fixed to the first sealing area (11A) and the third sealing area (11C).

5. The soft-pack battery cell according to claim 3, characterized in that: The width of the first sealing area (11A) is 4 / 11-10 / 11 of the width of the second sealing area (11B), and / or the width of the third sealing area (11C) is 4 / 11-10 / 11 of the width of the second sealing area (11B).

6. The soft-pack battery cell according to claim 3, characterized in that: The widths of the first sealing area (11A) and the third sealing area (11C) are both 4-10 mm.

7. The soft-pack battery cell according to claim 3, characterized in that: The width of the second sealing area (11B) is 5-11 mm.

8. The soft-pack battery cell according to claim 3, characterized in that: The second sealing area (11B) is connected to the first sealing area (11A) via a chamfer (R), and / or the second sealing area (11B) is connected to the third sealing area (11C) via a chamfer (R).

9. The soft-pack battery cell according to claim 8, characterized in that: The radius of the chamfer (R) is 1-4 mm.

10. An electric vehicle, characterized in that: Comprising the soft-pack battery cell as described in any one of claims 1 to 9.

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