Pin fixing structure and battery

Abstract

A pin (3) fixing structure and a battery. The pin (3) fixing structure comprises lower plastic (1), a retaining member (2), and a pin (3). The lower plastic (1) is provided with a positioning slot (12), and one end of the positioning slot (12) is provided with an opening (121). The retaining member (2) is provided on the inner side walls of the positioning slot (12), and the retaining member (2) extends in a first direction. The pin (3) comprises a connecting sheet (31) and a pin body (32), and when the connecting sheet (31) is inserted into the positioning slot (12) through the opening, the retaining member (2) abuts against the connecting sheet (31). The pin (3) fixing structure can make the safety of batteries higher during assembly.

Description

Foot fixing structure and battery

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 7, 2023, with application number 202322429528.8 and application name “Pin fixing structure and battery”. The entire contents of the above application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a pin fixing structure and a battery. Background Art

[0003] The battery pins include a bent connecting piece and a pin body. The connecting piece is welded to the pole mounted on the lower plastic of the battery to fix the pin; the tab on the battery cell pack inside the battery is connected to the pin body to achieve electrical connection between the pin and the battery cell pack. Technical issues

[0004] However, after the tab is welded to the pin body and before the battery pack and pins are installed as a whole in the battery casing, due to the heavy weight of the battery pack and the thin thickness of the connecting piece, it is easy for the connecting piece to warp and deform under the action of the gravity of the battery pack, thereby causing the pin body to shift in position; on the one hand, it will pull the tab and cause the tab to break, thereby causing the battery pack to short-circuit, catch fire or even explode, which is less safe; on the other hand, it will cause the pin body to detach from the protective film bonded to its outside, or cause the pin body to puncture the protective film, and the protection of the pin body cannot be guaranteed. Solution

[0005] The present application provides a pin fixing structure and a battery.

[0006] In a first aspect, the present application provides a pin fixing structure, comprising:

[0007] The lower plastic is provided with a positioning groove, and one end of the positioning groove is provided with an opening;

[0008] A retaining member is provided on an inner side wall of the positioning groove adjacent to the opening, and the retaining member extends along a first direction;

[0009] The pin includes a bent connecting piece and a pin body. When the connecting piece is inserted into the positioning groove through the opening along the second direction, the blocking member abuts against the connecting piece. The first direction is perpendicular to the second direction.

[0010] In a second aspect, the present application provides a battery, which includes the pin fixing structure of the present application. Beneficial effects

[0011] The present application provides a positioning groove with an opening on the lower plastic, and provides a stopper on the inner wall of the positioning groove adjacent to the opening; when the connecting piece is inserted into the positioning groove through the opening along the second direction, the stopper can directly abut the connecting piece, so that the stopper provides support for the connecting piece; compared with the prior art in which the connecting piece is fixed only by welding, by increasing the auxiliary support of the stopper on the connecting piece, it can better avoid the connecting piece from warping and deforming under the gravity of the battery pack, thereby causing the pin body to shift in position; on the one hand, it can avoid pulling the pole ear to cause the pole ear to break, reduce the probability of short circuit, fire or even explosion of the battery pack, and have higher safety; on the other hand, it can avoid the pin body from being detached from the protective film bonded to its outside, and avoid the pin body from puncturing the protective film, thereby ensuring the protective effect of the protective film on the pin body.

[0012] The battery of the present application includes the pin fixing structure of the present application, which can avoid position displacement of the pin body during the battery assembly process, ensure the good performance of the tabs and protective film, and thus ensure the high safety of the battery during the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic structural diagram of a pin fixing structure provided in the present application;

[0014] FIG2 is a schematic diagram of the structure of the pin provided by the present application without being inserted into the positioning groove;

[0015] FIG3 is a schematic structural diagram of the lower plastic and the retaining member provided by the present application;

[0016] FIG4 is a schematic diagram of the structure of the tab and the lead body before welding provided by the present application;

[0017] FIG5 is a schematic diagram of the structure of the tab and the pin body after welding provided by the present application.

[0018] Description of reference numerals:

[0019] 1- lower plastic; 11- lower surface; 12- positioning groove; 121- opening;

[0020] 2-stop member; 21-first baffle;

[0021] 3-pin; 31-connecting piece; 311-welding portion; 312-abutting portion; 32-pin body; 321-first plate; 322-second plate; 323-middle plate;

[0022] 4-battery cell pack; 41-ear; 5-pole.

[0023] In this embodiment, a pin fixing structure and a battery including the pin fixing structure are proposed. The battery also includes a cell pack and a shell. The cell pack and the pin fixing structure are both encapsulated in the shell. The tabs on the cell pack are electrically connected to the pin fixing structure, so that the electrical properties of the cell pack can be led out of the battery through the pin fixing structure.

[0024] Specifically, as shown in Figures 1 to 3, the pin fixing structure includes a lower plastic 1, a retaining member 2, and a pin 3; wherein, a positioning groove 12 is provided on the lower surface 11 of the lower plastic 1, and an opening 121 is provided at one end of the positioning groove 12; the retaining member 2 is provided on the inner side wall of the positioning groove 12 adjacent to the opening 121, and the retaining member 2 extends along a first direction; the pin 3 includes a bent connecting piece 31 and a pin body 32, the connecting piece 31 is provided horizontally, and the pin body 32 is provided vertically downward, and the tab 41 on the battery pack 4 is electrically connected to the pin body 32 of the pin fixing structure; when the connecting piece 31 is inserted into the positioning groove 12 through the opening 121 along the second direction, the retaining member 2 abuts against the connecting piece 31. wherein, the first direction is perpendicular to the second direction, the first direction is specifically shown by arrow A in Figures 1 and 2, and the second direction is specifically shown by arrow B in Figures 1 and 2.

[0025] Compared with the prior art, the pin fixing structure in this embodiment has a stopper 2 on the inner wall of the positioning groove 12 adjacent to the opening 121; when the connecting piece 31 is inserted into the positioning groove 12 through the opening 121 along the second direction, the stopper 2 can directly abut against the connecting piece 31, so that the stopper 2 provides support for the connecting piece 31; compared with the prior art in which only welding is used to fix the connecting piece 31, by adding the auxiliary support of the stopper 2 on the connecting piece 31, it is possible to better avoid the connecting piece 31 from warping and deformation under the action of gravity of the battery pack 4, thereby causing the pin body 32 to shift in position; on the one hand, it can avoid pulling the tab 41 to cause the tab 41 to break, thereby reducing the probability of short circuit, fire or even explosion of the battery pack 4, and having higher safety; on the other hand, it can avoid the pin body 32 from being detached from the protective film bonded to its outside, and avoid the pin body 32 from puncturing the protective film, thereby ensuring the protective effect of the protective film on the pin body 32.

[0026] The battery of the present application, since it includes the pin fixing structure of this embodiment, can avoid position displacement of the pin body 32 during the battery assembly process, ensure the good performance of the tab 41 and the protective film, and thus ensure the high safety of the battery during the assembly process.

[0027] In one embodiment, the connecting piece 31 includes a welding portion 311 and an abutting portion 312, and the abutting portion 312 is located between the welding portion 311 and the pin body 32; when the connecting piece 31 is inserted into the positioning groove 12 through the opening 121 along the second direction, the retaining member 2 directly abuts against the abutting portion 312 of the connecting piece 31, and the welding portion 311 is used to weld to the pole 5 on the lower plastic 1, so that the connecting piece 31 can be fixed to the lower plastic 1 by welding, thereby ensuring the auxiliary support role of the retaining member 2 on the connecting piece 31.

[0028] It is worth noting that, since the thickness of the connecting piece 31 is relatively thin, in this embodiment, laser penetration welding is used between the welding portion 311 and the pole 5 to increase the welding area between the welding portion 311 and the pole 5, thereby ensuring that the connection between the connecting piece 31 and the pole 5 is relatively stable, thereby ensuring that the connecting piece 31 is effectively fixed on the lower plastic 1, so as to better prevent deformation of the connecting piece 31.

[0029] Specifically, since the tab 41 is connected to the pin body 32, under the action of the gravity of the battery cell package 4, the part of the abutment 312 close to the connection with the pin body 32 will be more easily deformed; therefore, as shown in Figures 1 to 3, the stopper 2 is arranged near the bent connection between the abutment 312 of the connecting piece 31 and the pin body 32, so that the stopper 2 can support the part of the abutment 312 that is more prone to deformation, thereby ensuring a better support effect on the connecting piece 31 and better avoiding deformation of the connecting piece 31.

[0030] In one embodiment, at least one retaining member 2 is provided. By providing multiple retaining members 2, a better abutting support effect on the abutting portion 312 can be ensured, thereby preventing deformation of the connecting piece 31. In this embodiment, as shown in Figures 1 to 3, one retaining member 2 is provided. The specific number of retaining members 2 is not limited and needs to be determined based on the specific structure of the lower plastic 1 and the support and fixation requirements for the connecting piece 31.

[0031] Specifically, the distance between the bottom end surface of the stopper 2 and the bottom of the positioning groove 12 is greater than the thickness of the connecting piece 31 by 0.1mm-0.2mm, so that the connecting piece 31 can be inserted into the positioning groove 12 more smoothly, avoiding interference of the stopper 2 with the insertion of the connecting piece 31.

[0032] In one embodiment, as shown in Figures 1 to 3 , the top surface of the retaining member 2 is flush with the top surface of the positioning groove 12 and the lower surface 11 of the lower plastic 1, thereby improving the flatness of the lower surface 11 of the lower plastic 1 and enhancing the appearance of the lower plastic 1. It is worth noting that the bottom surface and top surface mentioned in this embodiment specifically refer to the placement of the lower plastic 1 in Figure 2 .

[0033] Specifically, the width of the blocking member 2 in the second direction is 5 mm to 20 mm, so as to save the manufacturing cost of the blocking member 2 while ensuring the abutting and supporting effect of the blocking member 2 on the abutting portion 312 .

[0034] In this embodiment, as shown in Figure 3, the retaining member 2 and the lower plastic 1 are an integral injection-molded structure. On the one hand, this can make the processing of the retaining member 2 simpler and more convenient. On the other hand, it can ensure the connection stability between the retaining member 2 and the lower plastic 1, and prevent the retaining member 2 from falling off the lower plastic 1.

[0035] In one embodiment, as shown in Figures 1 to 3, the blocking member 2 includes two first baffles 21, the two first baffles 21 are arranged opposite to each other and in a straight line, and the first baffles 21 extend along the first direction; one end of one of the first baffles 21 is arranged on an inner side wall of the positioning groove 12, and the other end is a free end; one end of the other first baffle 21 is arranged on the other inner side wall of the positioning groove 12, and the other end is a free end; and the interval between the free ends of the two first baffles 21 is larger, so that the lengths of the two first baffles 21 are shorter.

[0036] By providing two first baffles 21, both first baffles 21 can simultaneously support the abutting portion 312, thereby providing a better support effect on the connecting piece 31. In addition, providing two shorter first baffles 21 can reduce the manufacturing cost of the first baffles 21 while ensuring the support effect of the first baffles 21 on the abutting portion 312. The length of the first baffles 21 in the first direction is 10 mm to 30 mm.

[0037] In other embodiments, the blocking member 2 can also include a second baffle, the two ends of which are respectively arranged on the two opposite inner walls of the positioning groove 12 adjacent to the opening 121, and the second baffle extends along the first direction, that is, a second baffle of an integral structure passes through the positioning groove 12 along the first direction.

[0038] By providing a second baffle with an integral structure, the abutting area between the second baffle and the abutting portion 312 can be increased, thereby ensuring the supporting effect of the abutting portion 312 and better preventing the connecting piece 31 from being deformed.

[0039] At present, the pin body used is a plate-like structure extending along the second direction. After the tab is bent and welded to the pin body, the pin body and the tab connected thereto need to be flattened as a whole, so that the battery pack and the pin fixing structure can be easily encapsulated in the outer shell as a whole; however, the tab needs to be bent twice, and during the second bending, due to the influence of the pin body, it is easy to cause the tab to be inserted back into the battery pack too deeply during the second bending process and contact the tab of the other polarity in the battery pack, resulting in a direct connection between the positive tab and the negative tab in the battery pack and a short circuit, which has low safety.

[0040] As shown in Figures 4 and 5, the pin body 32 in this embodiment is a flat plate extending in the vertical direction, with no structure extending in the second direction. The tabs 41 of the cell pack 4 are bent and directly welded to the flat plate. In other words, with a flat pin body 32, the tabs 41 only need to be bent once and then welded to the pin body 32, without the need to flatten the tabs 41 and the pin body 32 as a whole. In this embodiment, laser welding is used between the tabs 41 and the pin body 32, reducing the number of welding steps and simplifying the welding method.

[0041] By configuring the pin body 32 as a flat plate extending in the vertical direction, on the one hand, it is possible to prevent the tab 41 from being inserted too deeply into the cell pack 4 as the pin body 32 is folded flat, thereby preventing the tab 41 from contacting the tab 41 of the other polarity in the cell pack 4, thereby preventing the positive tab 41 and the negative tab 41 in the cell pack 4 from being directly connected and causing a short circuit, thereby improving safety. On the other hand, it is possible to reduce the number of times the tab 41 is bent, thereby reducing the risk of the tab 41 being torn during multiple bending processes, thereby better protecting the tab 41. At the same time, since the folding step in the process of welding the tab 41 is simplified, production costs can be reduced. In addition, the structure of the pin body 32 is simpler, which can save raw materials for manufacturing the pin body 32. In this embodiment, the length of the pin body 32 in the vertical direction is 40mm-80mm, and the width of the pin body 32 in the first direction is 10mm-16mm.

[0042] In one embodiment, as shown in Figures 4 and 5, a battery pack 4 is respectively provided on two opposite sides of the pin body 32 in the first direction, that is, a double battery pack 4 structure is formed; the flat plate specifically includes a first flat plate 321 and a second flat plate 322 parallel to each other, and an intermediate plate 323 is connected between the first flat plate 321 and the second flat plate 322 so that the pin body 32 can form a Z-shaped structure; and the first flat plate 321 is used to weld the pole ear 41 of one of the battery packs 4, and the second flat plate 322 is used to weld the pole ear 41 of the other battery pack 4.

[0043] By setting the pin body 32 to a Z-shaped structure, the pin body 32 can be matched with the welding positions of the tabs 41 on the battery packs 4 on both sides, ensuring that the tabs 41 on the two battery packs 4 can be smoothly welded to one pin body 32, and ensuring that the two tabs 41 welded on one pin body 32 do not interfere with each other, thereby ensuring the safety of the welding of the tabs 41.

[0044] The pin fixing structure in this embodiment can increase the support effect on the connecting piece 31 by setting the stopper 2, thereby preventing the connecting piece 31 from being deformed, thereby ensuring that the protective film on the tab 41 and the pin body 32 maintains good performance, thereby making the safety during the battery assembly process higher; at the same time, the pin body 32 is set to be a flat plate extending in the vertical direction, which reduces the number of bending times of the tab 41 and avoids the short circuit of the battery caused by the tab 41 during the secondary bending process of the pin body 32, thereby ensuring the safety of the battery assembly process.

Claims

1. A pin fixing structure, characterized in that: include: A lower plastic (1), wherein a positioning groove (12) is provided on the lower plastic (1), and an opening (121) is provided at one end of the positioning groove (12); A blocking member (2), the blocking member (2) being arranged on an inner side wall of the positioning groove (12) adjacent to the opening (121), and the blocking member (2) extending along a first direction; A pin (3), the pin (3) comprising a connecting piece (31) and a pin body (32) connected by bending, when the connecting piece (31) is inserted into the positioning groove (12) through the opening (121) along the second direction, the blocking member (2) abuts against the connecting piece (31), and the first direction is perpendicular to the second direction.

2. The pin fixing structure according to claim 1, characterized in that: The blocking member (2) comprises two first baffles (21), and the two first baffles (21) are arranged opposite to each other; One end of one of the first baffles (21) is arranged on an inner side wall of the positioning groove (12), and the other end is a free end; One end of another of the first baffles (21) is arranged on another inner side wall of the positioning groove (12), and the other end is a free end.

3. The pin fixing structure according to claim 2, characterized in that: The length of the first baffle (21) in the first direction is 10 mm-30 mm.

4. The pin fixing structure according to claim 1, characterized in that: The blocking member (2) comprises: A second baffle, the two ends of the second baffle are respectively arranged on two opposite inner side walls of the positioning groove (12) adjacent to the opening (121).

5. The pin fixing structure according to any one of claims 1 to 4, characterized in that: The retaining member (2) is arranged close to the bent connection between the connecting piece (31) and the pin body (32), and at least one retaining member (2) is arranged.

6. The pin fixing structure according to any one of claims 1 to 4, characterized in that: The distance between the bottom end surface of the retaining member (2) and the bottom of the positioning groove (12) is greater than the thickness of the connecting piece (31) by 0.1 mm to 0.2 mm.

7. The pin fixing structure according to any one of claims 1 to 4, characterized in that: The top end surface of the stopper (2) is flush with the top end surface of the positioning groove (12) and the lower surface (11) of the lower plastic (1).

8. The pin fixing structure according to any one of claims 1 to 4, characterized in that: The retaining member (2) and the lower plastic (1) are an integral injection-molded structure.

9. The pin fixing structure according to any one of claims 1 to 4, characterized in that: The pin body (32) is a flat plate extending in a vertical direction, and the pole lug (41) of the battery pack (4) is welded to the flat plate.

10. The pin fixing structure according to claim 9, characterized in that: The pin body (32) is provided with a battery core package (4) on two opposite sides in the first direction respectively; the flat plate comprises: A first flat plate (321) and a second flat plate (322) are parallel to each other, an intermediate plate (323) is connected between the first flat plate (321) and the second flat plate (322), so that the pin body (32) forms a Z-shaped structure, the first flat plate (321) is used for welding the pole lug (41) of one of the battery packs (4), and the second flat plate (322) is used for welding the pole lug (41) of another of the battery packs (4).

11. The pin fixing structure according to any one of claims 1 to 4, characterized in that: The connecting piece (31) comprises a welding portion (311) and an abutting portion (312); the abutting portion (312) is located between the welding portion (311) and the pin body (32); the welding portion (311) is used for welding to the pole (5) on the lower plastic (1); and the retaining member (2) abuts against the abutting portion (312).

12. The pin fixing structure according to any one of claims 1 to 4, characterized in that: The width of the blocking member (2) in the second direction is 5 mm-20 mm.

13. The pin fixing structure according to any one of claims 1 to 4, characterized in that: The length of the pin body (32) in the vertical direction is 40 mm to 80 mm, and the width of the pin body (32) in the first direction is 10 mm to 16 mm.

14. A battery, characterized in that It comprises the pin fixing structure as claimed in any one of claims 1 to 13.

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