Pin and battery structure

Abstract

This invention discloses a pin and a battery cell structure. The pin includes a terminal welding portion and a tab welding portion. The terminal welding portion has a connecting portion for cooperating with the terminal. The tab welding portion has a second through hole and a boss. The projection of the boss onto the plane of the second through hole at least partially coincides with the second through hole. Due to the setting of the second through hole and the boss, the pin provided in this embodiment has the advantages of easy clamping of tooling fixtures, avoiding the laser welding area, and ensuring the reliability of laser welding. The battery cell structure includes a core package. The two opposite end faces of the core package are defined as lead-out faces. The two lead-out faces are provided with tabs. The tab welding portion is clamped between the lead-out faces and the pin. The tabs are full tabs integrated with the electrode sheet, which ensures the fast charging performance and life of the battery cell structure, while reducing the tab cutting process and reducing costs.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a pin and cell structure. Background Technology

[0002] A battery cell structure typically includes a core package and leads. The core package leads to tabs. Currently, the tabs are welded by first cutting them and then performing ultrasonic welding.

[0003] To ensure that the pins are easy to clamp with tooling fixtures, pins are generally equipped with side wings. However, the pins need to be bent before and after soldering, making it difficult to guarantee the flatness of the two wing surfaces and the middle surface. Furthermore, the side wings can cause difficulties in core packaging or cause the pins to touch the casing of the cell structure, resulting in a short circuit. Summary of the Invention

[0004] In order to overcome at least one of the defects described in the prior art, the present invention provides a pin and a cell structure that is easy to assemble and avoids short circuits.

[0005] The technical solution adopted by this invention to solve its problem is:

[0006] In a first aspect, the present invention provides a pin, comprising:

[0007] Pole post welding section;

[0008] The electrode tab welding part is connected to the electrode post welding part;

[0009] The electrode welding part is provided with a connecting part for cooperating with the electrode;

[0010] The electrode tab welding part is provided with an electrode tab welding area and a clamp fixing part. The clamp fixing part is disposed away from the electrode tab welding area, and the electrode tab can be welded to the electrode tab welding area.

[0011] With this configuration, the tooling fixture can hold the fixture fixing part to move the pin, and the tab soldering area is set away from the fixture fixing part, eliminating the need for side wing structures and ensuring the flatness of the tab soldering area.

[0012] According to a preferred embodiment, the clamp fixing part includes a second through hole and a boss, wherein the projection of the boss onto the plane where the second through hole is located at least partially coincides with the second through hole.

[0013] According to a preferred embodiment, the electrode post welding portion and the electrode lug welding portion are configured as L-shaped metal plates.

[0014] According to a preferred embodiment, the thickness of the L-shaped metal plate is defined as T1, where 0.6mm≤T1≤2mm. This design allows the pins to fit as close as possible to the surface of the core package, avoiding short circuits caused by contact with the casing of the battery cell structure, and ensuring the connection strength between the L-shaped metal plate and the tabs or posts.

[0015] According to a preferred embodiment, the thickness of the boss is defined as T2, and 0.7mm≤T2≤3mm. This design facilitates the clamping of the tooling fixture and avoids the boss from touching the housing of the battery cell structure, which would affect assembly efficiency and may also cause short circuits.

[0016] According to a preferred embodiment, the direction from the electrode lug welding portion to the electrode post welding portion is defined as the height direction, the height of the boss is defined as H2, where H2 ≥ 1 mm, and the height of the second through hole is defined as H1, where H1 ≥ 1.1 * H2. This design facilitates the tooling fixture to pass through the second through hole and be clamped on the boss, preventing the opening size of the second through hole from being too small and interfering with the clamping operation of the tooling fixture.

[0017] According to a preferred embodiment, the connecting portion is configured as a first through hole, and a recess is provided inside the first through hole.

[0018] According to a preferred embodiment, the length of the boss is defined as L1, where L1 ≥ 1mm. This design prevents the boss from being too short, which would make it too difficult to clamp.

[0019] Secondly, the present invention also provides a battery cell structure, including a pin as described above, and a core package, defining the two opposite ends of the core package as lead-out surfaces, the two lead-out surfaces being provided with tabs, the tabs including a bent portion and an attachment portion that are connected to each other and arranged at an angle, the bent portion leading out of the lead-out surface, and the attachment portion being used for soldering connection with the tab solder area of ​​the pin;

[0020] The tab solder portion of the pin is clamped between the lead-out surface and the attachment portion.

[0021] According to a preferred embodiment, the electrode tab is an integral part of the electrode plate.

[0022] This setup significantly improves fast charging performance.

[0023] According to a preferred embodiment, the device further includes a PET film disposed between the pin and the core package.

[0024] According to a preferred embodiment, the thickness of the PET film is defined as T4, where 0.02mm≤T4≤0.3mm. With this design, if the thickness of the PET film is less than 0.02mm, good insulation cannot be guaranteed; if the thickness of the PET film is greater than 0.3mm, it will affect the flatness of the pins and the core package after assembly, and may easily cause assembly interference between the pins and the outer shell of the battery cell structure.

[0025] According to a preferred embodiment, the PET film has side wings that at least partially surround the tab welding portion of the pin for protecting the tab.

[0026] According to a preferred embodiment, it further includes a side patch disposed on the outside of the tab.

[0027] According to a preferred embodiment, the side patch has a protrusion that is opposite to the boss of the pin.

[0028] According to a preferred embodiment, the thickness of the side patch is defined as T3, where 0.03mm≤T3≤0.5mm. This design can protect the sidewalls of the pins and prevent assembly interference with the aluminum shell during the process of the core package being inserted into the housing.

[0029] According to a preferred embodiment, the device further includes an aluminum shell and a protective film, wherein the pins, the core package, the PET film and the side patch are disposed inside the aluminum shell, and the protective film is disposed around the outside of the aluminum shell.

[0030] In summary, the pin and cell structure provided by this invention has the following technical effects:

[0031] This invention discloses a pin and a battery cell structure. The pin includes a terminal welding portion and a tab welding portion. The terminal welding portion has a connecting portion for mating with the terminal. The tab welding portion has a second through hole and a boss. The projection of the boss onto the plane of the second through hole at least partially coincides with the second through hole. Due to the arrangement of the second through hole and the boss, when the pin provided by this invention is clamped by a tooling fixture, the fixture extends into the second through hole and clamps the boss, avoiding the laser soldering area during clamping and ensuring the reliability of laser soldering. Furthermore, the battery cell structure includes a core package. The two opposite ends of the core package are defined as lead-out surfaces. Each lead-out surface is provided with tabs. Each tab includes a bent portion and an attachment portion that are connected to each other and set at an angle. The bent portion extends out of the lead-out surface, and the attachment portion is used to weld to the tab soldering area of ​​the pin. The tab soldering portion of the pin is clamped between the lead-out surface and the attachment portion. In other words, the tab is bent 180° from the lead-out surface of the pin and flipped to the outside of the pin for laser welding. Specifically, the tab is an integrated tab with the electrode sheet, which ensures the fast charging performance and lifespan of the cell structure, while reducing the tab cutting process and lowering costs. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of the pins according to an embodiment of the present invention;

[0033] Figure 2 This is a top view of the pins in a certain direction according to an embodiment of the present invention;

[0034] Figure 3 For relative to Figure 2 The front view;

[0035] Figure 4 For relative to Figure 3 The right view;

[0036] Figure 5 This is an exploded perspective view of the battery cell structure according to an embodiment of the present invention;

[0037] Figure 6 This is a planar schematic diagram of the side patch according to an embodiment of the present invention;

[0038] Figure 7 This is a three-dimensional structural diagram of the PET film according to an embodiment of the present invention;

[0039] Figure 8 This is a partial assembly perspective view of the battery cell structure according to an embodiment of the present invention;

[0040] Figure 9 To distinguish from Figure 7 A schematic diagram of the three-dimensional structure of another type of PET film.

[0041] The meanings of the reference numerals in the attached figures are as follows:

[0042] 1-Pin; 11-Electrode solder joint; 12-Electrode tab solder joint; 13-First through hole; 14-Second through hole; 15-Boss;

[0043] 2-Top cover assembly; 3-Core package; 31-Electrode tab; 32-Lead-out surface; 4-PET film; 41-Side wing; 5-Side patch; 51-Protrusion; 6-Aluminum shell; 7-Protective film. Detailed Implementation

[0044] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0045] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, 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 invention.

[0046] In the description of this invention, 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 of the associated listed items. In particular, references to "the / described" object or "an" object are also intended to indicate one of a possible plurality of such objects.

[0047] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0048] Furthermore, in the description of this invention, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" are used to describe the angles shown in the accompanying drawings and should not be construed as limiting specific embodiments. It should also be understood that, in the context of an element or feature being connected "upper," "lower," "inner," or "outer" of another element (one or more), it can be directly connected to the other element (one or more) "upper," "lower," "inner," or "outer," or indirectly connected to the other element (one or more) "upper," "lower," "inner," or "outer" through an intermediate element.

[0049] Please refer to the following: Figures 1 to 4 The present invention first discloses a pin 1, which includes a terminal soldering portion 11 and a tab soldering portion 12; the tab soldering portion 12 is connected to the terminal soldering portion 11, and the terminal soldering portion 11 is provided with a connecting portion for mating with the terminal; the tab soldering portion 12 is provided with a tab soldering area (please refer to...). Figure 3The device includes part A and a fixture fixing part. The fixture fixing part is disposed away from the electrode tab soldering area. The electrode tab can be soldered to the electrode tab soldering area. Specifically, the fixture fixing part includes a second through hole 14 and a boss 15. The projection of the boss 15 on the plane where the second through hole 14 is located at least partially coincides with the second through hole 14. Due to the arrangement of the second through hole 14 and the boss 15, when the pin 1 in this embodiment is clamped by the tooling fixture, the fixture extends from the second through hole 14 and clamps the boss 15. During the clamping process, the laser soldering area can be avoided, and the reliability of laser welding can be guaranteed.

[0050] Furthermore, the electrode post welding portion 11 and the electrode tab welding portion 12 are configured as L-shaped metal plates. The bent portions of the electrode post welding portion 11 and the electrode tab welding portion 12, as well as the two sides of the electrode tab welding portion 12, are rounded or chamfered to remove sharp edges, which can protect the electrode tab 31. Please refer to [link / reference]. Figure 3 , Figure 3 This is a planar front view of the electrode tab welding part 12. The length of the boss 15 is defined as L1, where L1 ≥ 1mm. This design prevents the boss 15 from being too short, which would make clamping too difficult. Please refer to [link / reference]. Figure 4 , Figure 4 for Figure 3 The right view of the middle electrode tab welding part 12 shows that the thickness of the L-shaped metal plate is defined as T1, 0.6mm≤T1≤2mm. Due to the size of the aluminum shell 6 in the cell structure, the gap between the core and the aluminum shell is limited, so the L-shaped metal plate cannot be too thick. Furthermore, to ensure the connection strength between the L-shaped metal plate and the tab or pole, the L-shaped metal plate cannot be too thin. In this embodiment, 0.6mm≤T1≤2mm is sufficient. Within this thickness range, the L-shaped metal plate ensures structural strength without excessively occupying the core space, thus guaranteeing the energy density of the cell. The thickness of the boss 15 is defined as T2, 0.7mm≤T2≤3mm. This design facilitates clamping by tooling fixtures while preventing the boss 15 from touching the aluminum shell 6 of the battery cell structure, thus avoiding assembly efficiency and potential short circuits. The direction from the electrode welding part 12 to the electrode welding part 11 is defined as the height direction. The height of the boss 15 is defined as H2, where H2 ≥ 1mm, and the height of the second through hole 14 is defined as H1, where H1 ≥ 1.1 * H2. This design allows tooling fixtures to pass through the second through hole 14 and be clamped on the boss 15, preventing the opening size of the second through hole 14 from being too small and interfering with the clamping operation of the tooling fixtures.

[0051] As an optional implementation, the connecting part is configured as a first through hole 13, and a countersunk platform is provided on the inner side of the first through hole 13 to facilitate the insertion and engagement of the pole post with the first through hole 13. Of course, the countersunk platform may not be provided. Both of these methods fall within the protection scope of the present invention.

[0052] On the other hand, please refer to the following: Figures 5 to 9 The present invention also discloses a battery cell structure, which includes a top cover assembly 2, a core package 3, a PET film 4, a side patch 5, an aluminum shell 6, and a protective film 7. The two opposite ends of the core package 3 are defined as lead-out surfaces 32. The two lead-out surfaces 32 are provided with tabs 31. The tabs 31 include a bent portion and an attachment portion that are connected to each other and set at an angle. The bent portion leads out of the lead-out surface 32, and the attachment portion is used to weld to the tab soldering area of ​​the pin 1. The tab soldering portion 12 of the pin 1 is clamped between the lead-out surface 32 and the attachment portion. In other words, the tabs 31 are bent 180° away from the lead-out surface 32 and flipped to the outside of the pin 1 for laser welding. Specifically, the tabs 31 are full tabs, that is, the tabs 31 are integrated with the electrode sheet. The tabs 31 are directly led out from the outside of the current collector of the core package 3, which ensures the fast charging performance and life of the battery cell structure, while reducing the cutting process of the tabs 31 and reducing costs.

[0053] Furthermore, a PET film 4 is disposed between the lead 1 and the core package 3, the lead 1 is disposed on the PET film 4, the tab welding part 12 abuts against the portion of the PET film 4 at the lead-out surface 32, the post welding part 11 abuts against the portion of the PET film 4 at the top surface of the core package 3, and the top cover assembly 2 is disposed on the top surface of the core package 3. The top cover assembly 2 contains a post (not shown in the figure), which passes through the first through hole 13 of the post welding part 11. Please refer to [reference needed]. Figure 7 The PET film 4 is configured as a foldable bullet shape. The thickness of the PET film 4 is defined as T4, where 0.02mm≤T4≤0.3mm. With this design, if the thickness of the PET film 4 is less than 0.02mm, good insulation cannot be guaranteed. If the thickness of the PET film 4 is greater than 0.3mm, it will affect the flatness of the pin 1 and the core package 2 after assembly, and may cause assembly interference between the pin 1 and the aluminum shell 6. The PET film 4 is attached to the bottom surface of the pole and the lead-out surface 32 of the core package 3 through the folding pattern.

[0054] For a preferred implementation, please refer to [link / reference]. Figure 9 The PET film 4 may be provided with paired side wings 41, which at least partially surround the tab welding portion 12 of the pin 1 to protect the tab 31. When the two sides of the tab welding portion 12 of the pin 1 are not subjected to the edge removal process, this embodiment also falls within the protection scope of the present invention.

[0055] Furthermore, after pin 1 is attached to the PET film 4 and laser-welded to the tab 31, the side patch 5 is attached to the tab 31. Please refer to [link / reference]. Figure 6The side patch 5 has a protrusion 51. The shape of the protrusion 51 is not specifically limited and can be square, circular or any shape. Such changes are all within the protection scope of this invention. It needs to be ensured that the protrusion 51 is opposite to the boss 15 of the pin 1. The thickness of the side patch 5 is defined as T3, 0.03mm≤T3≤0.5mm. This design can protect the side wall of the pin 1 and will not interfere with the assembly of the core package 3 and the aluminum shell 6 during the assembly process. More preferably, the protrusion 51 and the side patch 5 are configured to be integrally formed. After assembly, the core package 3, PET film 4, pin 1, top cover assembly 2 and side patch 5 are installed into the aluminum shell 6. Since the pin 1 in this embodiment does not have a side wing 41 structure, the welding tooling method is changed to ensure the flatness of the welding surface of the pin 1, reduce the difficulty of the core package 3 entering the shell and avoid the pin 1 touching the aluminum shell 6. After the above components are installed in the aluminum shell 6, the protective film 7 is arranged around the outside of the aluminum shell 6 to complete the assembly of the cell structure.

[0056] In summary, this invention discloses a pin 1 and a battery cell structure. The pin 1 includes a terminal welding portion 11 and a tab welding portion 12. The terminal welding portion 11 has a connecting portion for cooperating with the terminal. The tab welding portion 12 has a second through hole 14 and a boss 15. The projection of the boss 15 onto the plane of the second through hole 14 at least partially overlaps with the second through hole 14. Due to the arrangement of the second through hole 14 and the boss 15, when the pin 1 provided in this embodiment is clamped by a tooling fixture, the fixture extends into the second through hole 14 and clamps the boss 15, avoiding the laser welding area during clamping and ensuring the reliability of laser welding. On the other hand, the battery cell structure includes a core package. 3. Define the two opposite ends of the core package 3 as lead-out surfaces 32. The two lead-out surfaces 32 are provided with tabs 31. The tabs 31 include a bent part and an attachment part that are connected to each other and set at an angle. The bent part leads out of the lead-out surface 32, and the attachment part is used to weld to the tab soldering area of ​​the pin 1. The tab soldering part 12 of the pin 1 is clamped between the lead-out surface 32 and the attachment part. In other words, the tab 31 is bent 180° from the lead-out surface 32 of the pin 1 and flipped to the outside of the pin 1 for laser welding. Specifically, the tab 31 is a full tab integrated with the electrode sheet, which ensures the fast charging performance and life of the cell structure, while reducing the cutting process of the tab 31 and reducing costs.

[0057] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A pin, characterized in that, include: Poles welding section (11); The electrode lug welding part (12) is connected to the electrode post welding part (11); The electrode welding part (11) is provided with a connecting part for cooperating with the electrode; The electrode welding part is provided with an electrode welding area and a clamp fixing part. The clamp fixing part is disposed away from the electrode welding area, and the electrode can be welded to the electrode welding area. The clamp fixing part includes a second through hole (14) and a boss (15), and the projection of the boss (15) on the plane where the second through hole (14) is located at least partially coincides with the second through hole (14); The pole post welding part (11) and the pole lug welding part (12) are configured as L-shaped metal plates.

2. A pin according to claim 1, characterized in that: The thickness of the L-shaped metal plate is defined as T1, where 0.6mm ≤ T1 ≤ 2mm.

3. A pin according to claim 1, characterized in that: The thickness of the boss (15) is defined as T2, where 0.7mm ≤ T2 ≤ 3mm.

4. A pin according to claim 1 or 3, characterized in that: The direction from the electrode tab welding part (12) to the electrode post welding part (11) is defined as the height direction, the height of the boss (15) is defined as H2, where H2 ≥ 1 mm, and the height of the second through hole (14) is defined as H1, where H1 ≥ 1.1 * H2.

5. A pin according to claim 1, characterized in that: The connecting part is configured as a first through hole, and a countersunk platform is provided inside the first through hole.

6. A pin according to claim 1, characterized in that: The length of the boss (15) is defined as L1, where L1 ≥ 1 mm.

7. A battery cell structure, comprising a pin as described in any one of claims 1-6, characterized in that: It also includes a core package (3), and defines the two opposite ends of the core package (3) as lead-out surfaces (32). The two lead-out surfaces (32) are provided with tabs (31). The tabs (31) include a bent portion and an attachment portion that are connected to each other and set at an angle. The bent portion leads out of the lead-out surface (32), and the attachment portion is used to weld to the tab solder area of ​​the pin. The tab soldering portion (12) of the pin (1) is clamped between the lead-out surface (32) and the attachment portion.

8. A cell structure according to claim 7, characterized in that: The electrode tab (31) is an integral electrode tab that is integrated with the electrode plate.

9. A cell structure according to claim 7, characterized in that: It also includes a PET film (4) disposed between the pin (1) and the core package (3).

10. A cell structure according to claim 9, characterized in that: The thickness of the PET film (4) is defined as T4, where 0.02mm ≤ T4 ≤ 0.3mm.

11. A cell structure according to claim 9, characterized in that: The PET film (4) is provided with side wings (41), which at least partially surround the tab welding portion (12) of the pin (1) for protecting the tab (31).

12. A cell structure according to claim 9, characterized in that: It also includes a side patch (5), which is located on the outside of the tab (31).

13. A cell structure according to claim 12, characterized in that: The side patch (5) has a protrusion (51) which is opposite to the boss (15) of the pin (1).

14. A cell structure according to claim 12 or 13, characterized in that: The thickness of the side patch (5) is defined as T3, where 0.03mm ≤ T3 ≤ 0.5mm.

15. A cell structure according to claim 12, characterized in that: It also includes an aluminum shell (6) and a protective film (7), wherein the pin (1), the core package (3), the PET film (4) and the side patch (5) are disposed inside the aluminum shell (6), and the protective film (7) is disposed around the outside of the aluminum shell (6).

Images