Battery cell connecting piece and battery

Abstract

The utility model discloses a battery cell connecting piece and a battery, the battery cell connecting piece comprises a connecting piece body, a side part, a bottom part and a convex part, and the connecting piece body is provided with a through hole; the side part is connected with the connecting sheet body and surrounds the via hole; the bottom is connected with the side part and opposite to the via hole, and a welding area is formed at the bottom; the protruding part is connected with the side part and extends in the direction perpendicular to the axis of the via hole. The protruding part and the bottom are arranged at intervals. The pole is connected to the side, away from the welding area, of the bottom. Compared with the prior art, the gap is reserved between the convex part and the bottom part, the colloid can be accommodated in the gap, and the convex part can play a role in preventing the colloid from falling off as the convex part extends towards the direction close to the via hole, so that the lithium precipitation and short circuit of the battery core caused by the falling of metal chips are prevented.

Description

Technical Field

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

[0002] Lithium batteries have advantages such as small size, high energy density, long service life, and environmental friendliness. In the field of new energy technology, lithium batteries are widely used in industries such as automobiles, electronic products, and energy storage systems.

[0003] In the production process of lithium batteries, cell connectors are key components used to connect battery cells, playing a crucial role in the construction and operation of battery packs. Currently, during the laser welding of cell connectors to the electrode posts, metal debris is generated. To prevent the metal debris from falling off, adhesive is applied to the laser welding area of ​​the electrode tabs to form a film that seals the metal debris. However, during battery charging and discharging, the internal temperature rises, and this adhesive layer may slide, shift, or even fall off. In this case, the metal debris will fall into the electrolyte, leading to lithium plating and short circuits in the cell. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the present invention provides a cell connecting piece and a battery, which can prevent the adhesive applied during battery charging and discharging from falling off.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A battery cell connector includes a connector body, a side portion, a bottom portion, and a protrusion. The connector body has a through hole. The side portion is connected to the connector body and surrounds the through hole. The bottom portion is connected to the side portion and opposite to the through hole, and a welding area is formed on the bottom portion. The protrusion is connected to the side portion and extends along a direction perpendicular to the axis of the through hole, and the protrusion and the bottom portion are spaced apart.

[0007] In one embodiment, the number of protrusions is multiple, and the multiple protrusions are arranged at intervals around the through hole.

[0008] In one embodiment, the cell connector includes a protective element that covers the welding area and is at least partially located between the protrusion and the bottom.

[0009] In one embodiment, the protective member and the protrusion are connected, or the protective member and the protrusion are spaced apart.

[0010] In one embodiment, the length of the protective member is L1 along the direction perpendicular to the axis of the through hole, and the length of the welding area is L2, where L1 > 1.3L2.

[0011] In one embodiment, the length of the protective member is L1 along the direction perpendicular to the axis of the through hole, and the length of the protective member between the protrusion and the bottom is L3, where L3 ≥ 0.2L1.

[0012] In one embodiment, the protrusion is recessed on the side opposite to the through hole towards the through hole to form a groove.

[0013] In one embodiment, the thickness of the bottom is H1 along the thickness direction of the bottom, and the distance between the bottom and the protrusion is H2, where H1 > H2.

[0014] In one embodiment, the bottom includes a main body and an edge portion. The edge portion is circumferentially connected to the outer periphery of the main body and connected to the side portion. The main body has the welding area. Along a direction perpendicular to the axis of the through hole, the protrusion extends toward the through hole and does not exceed the edge portion.

[0015] This utility model also provides a battery, including the cell connecting piece and the terminal post in any of the above embodiments, wherein the terminal post is connected to the bottom side away from the welding area.

[0016] The beneficial effects of this utility model are as follows: This application provides a cell connecting piece and a battery. The cell connecting piece includes a connecting piece body, a side portion, a bottom portion, and a protrusion. The connecting piece body has a through hole; the side portion is connected to the connecting piece body and surrounds the through hole; the bottom portion is connected to the side portion and faces the through hole, and a welding area is formed on the bottom portion; the protrusion is connected to the side portion and extends in a direction perpendicular to the axis of the through hole, and the protrusion and the bottom portion are spaced apart; the electrode post is connected to the side of the bottom portion away from the welding area. Compared with the prior art, there is a gap between the protrusion and the bottom portion, which can accommodate the colloid. Furthermore, since the protrusion extends towards the through hole, it can prevent the colloid from falling out, thereby preventing metal shavings from falling out and causing lithium plating or short circuits in the cell. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a battery cell connector according to this utility model is shown;

[0018] Figure 2 A cross-sectional schematic diagram of a battery cell connector according to the present invention is shown;

[0019] Figure 3 This shows another cross-sectional schematic diagram of a battery cell connector according to the present invention;

[0020] Figure 4 This shows another cross-sectional schematic diagram of a battery cell connector according to the present invention;

[0021] Figure 5 It shows Figure 1 Enlarged view of point A in the image;

[0022] Reference numerals: 1. Connecting piece body; 11. Through hole; 12. Bottom; 13. Side; 14. Protrusion; 121. Welding area; 122. Edge; 123. Main body; 141. Groove. Detailed Implementation

[0023] In this utility model, the terms "set up," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or constituent parts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] See Figure 1This application provides a battery including terminals (not shown in the figure) and cell connecting pieces, with the terminals connected to the cell connecting pieces. In practical applications, terminals are key conductive components in batteries or electrical devices that connect internal electrodes to external circuits. Their core function is to provide a stable path for current transmission. Cell connecting pieces are key conductive components that enable connections between individual cells or between a cell and an external circuit. The connection between the cell connecting pieces and the terminals forms a metallic interface, ensuring efficient current transmission and achieving an efficient electrical path.

[0029] See Figure 2 The battery cell connector includes a connector body 1, a side portion 13, a bottom portion 12, and a protrusion 14. The connector body 1 has a through hole 11. The side portion 13 is connected to the connector body 1 and surrounds the through hole 11. The bottom portion 12 is connected to the side portion 13 and is opposite to the through hole 11. The bottom portion 12 has a welding area 121. The protrusion 14 is connected to the side portion 13 and extends along a direction perpendicular to the axis of the through hole 11. The protrusion 14 and the bottom portion 12 are spaced apart. The electrode post is connected to the side of the bottom portion 12 away from the welding area 121.

[0030] It should be noted that the bottom 12 being opposite to the via 11 means that, along the axial direction of the via 11, the projection of the bottom 12 can completely or nearly completely cover the via 11.

[0031] In practical applications, the connecting piece body 1 has a through hole 11, which penetrates the two opposite surfaces of the connecting piece. The side part 13 is connected to the connecting piece body 1 and is arranged around the through hole 11. The bottom part 12 is connected to the side part 13 and is arranged opposite to the through hole 11. That is, the bottom part 12 blocks one end of the through hole 11. The bottom part 12 and the side part 13 form a "cylindrical" structure. The surface of the bottom part 12 has a welding area 121. The pole is located on the side of the bottom part 12 away from the welding area 121. The welder performs laser welding in the welding area 121 to fix the pole and the bottom part 12 together, thereby fixing the pole and the connecting piece body 1 together.

[0032] During the welding process, in order to prevent metal debris from falling off, adhesive can usually be applied to the welding area 121 for protection. The adhesive forms a film. In order to prevent the film from melting and falling off during subsequent battery charging and discharging, which would cause metal debris to fall off, this application provides a protrusion 14 on the side 13. The protrusion 14 extends towards the via 11 in a direction perpendicular to the axis of the via 11, and there is a gap between the protrusion 14 and the bottom 12. This gap can accommodate the adhesive. Since the protrusion 14 extends towards the via 11, it can block the adhesive from falling off, thereby preventing metal debris from falling out and causing lithium plating and short circuit in the battery cell.

[0033] See Figure 2The number of protrusions 14 is multiple, and the multiple protrusions 14 are arranged at intervals around the through hole 11.

[0034] In practical applications, there are usually at least two protrusions 14, which can be symmetrically arranged so that the length of the two protrusions 14 can cover a wider lateral area and better prevent the colloid from falling off. It is understood that the number of protrusions 14 can also be three, four or more, and this application does not limit this.

[0035] In one embodiment, the cell connector includes a protective element that covers the welding area 121 and is at least partially located between the protrusion 14 and the bottom 12.

[0036] In practical applications, the protective component can be made of colloid. During welding, the colloid is applied to the welding area 121 by dispensing to prevent metal shavings from falling off. The dispensing is not only applied to the welding area 121, but also between the protrusion 14 and the bottom 12. The colloid between the protrusion 14 and the bottom 12 and the colloid in the welding area 121 combine to form a film structure. The film structure will heat up and melt due to the charging and discharging of the battery. However, since the charging and discharging temperature of the battery is not very high, the film structure will not melt into a liquid and drip, but will only produce a slight sliding displacement. The protrusion 14 can just block the film structure from sliding down, preventing the film structure from detaching from the welding area 121 and causing metal shavings to fall off.

[0037] It should be noted that the protective component can also be made of other materials besides colloids, and this application does not limit this.

[0038] In one embodiment, the protective member can be in contact with the protrusion 14, that is, the protective member (colloid) directly contacts the protrusion 14, so that the protrusion 14 can better prevent the colloid from falling off.

[0039] In one embodiment, the protective element can also be spaced apart from the protrusion 14, so that the protective element (adhesive) does not need to be made thicker, making dispensing more convenient and saving dispensing costs. After the adhesive falls a short distance, it can still be blocked by the protrusion 14 to prevent the adhesive from falling further.

[0040] See Figure 3 and Figure 4 Along the direction perpendicular to the axis of the through hole 11, the length of the protective component is L1, and the length of the welding area 121 is L2, where L1 > 1.3L2.

[0041] For ease of description, Figure 3 The X direction in the figure represents the direction perpendicular to the axis of the via 11.

[0042] In practical applications, in order to achieve better coverage and to ensure that the protective element (colloid) is located between the protrusion 14 and the bottom 12, the length of the protective element (colloid) should exceed the length of the welding area 121, for example, L1 = 1.4L2, L1 = 1.45L2, etc.

[0043] See again Figure 4 Along the direction perpendicular to the axis of the through hole 11, the length of the protective member is L1, and the length of the protective member between the protrusion 14 and the bottom 12 is L3, where L3 ≥ 0.2L1.

[0044] In practical applications, the length of the protective component (colloid) between the protrusion 14 and the bottom 12 has a significant impact on preventing the protective component (colloid) from falling. If L3 is too short, it may not be able to effectively prevent the protective component (colloid) from falling. Therefore, L3 is set to values ​​such as 0.2L1, 0.21L1, or 0.22L1 to improve the success rate of the protrusion 14 in preventing the protective component (colloid) from falling.

[0045] Meanwhile, since the length of the protrusion 14 should not be too long, to avoid the protrusion 14 potentially obstructing the welding area 121 and affecting the welding operation; therefore, the length of L3 should also not be too long, for example, L3 can not exceed 0.3L1, and the specific value can be controlled according to the actual operation.

[0046] See again Figure 4 Along the thickness direction of the bottom 12, the thickness of the bottom 12 is H1, and the distance between the bottom 12 and the protrusion 14 is H2, where H1 > H2.

[0047] For ease of description, Figure 3 The Y direction in the figure represents the thickness direction of the bottom 12.

[0048] In practical applications, the thickness of the bottom 12 is usually greater than the distance between the bottom 12 and the protrusion 14. That is, the thickness of the bottom 12 is greater than the thickness of the protective component (colloid). Since the bottom 12 is the part welded to the pole post, a thicker bottom 12 helps maintain the stability of the pole post welding, thereby ensuring the stability of the welding between the connecting piece body 1 and the pole post. For example, H1 can be 1.5 times H2, 2 times H2, etc.

[0049] See again Figure 4 The protrusion 14 is recessed on the side opposite to the through hole 11 towards the through hole 11 to form a groove 141.

[0050] In practical applications, the groove 141 formed on the side of the protrusion 14 away from the via 11 can save material in the overall manufacturing of the battery cell connector. The side 13 can be formed by stamping to form the protrusion 14. The protrusion 14 formed in this way will produce a groove 141 on the side away from the via 11. On the one hand, it can reduce the use of materials and save costs, and on the other hand, the process is simple and easy to operate.

[0051] It should be noted that the protrusion 14 can also be formed in other ways, such as injection molding, and this application does not limit this.

[0052] See Figure 5 The bottom 12 includes a main body 123 and an edge 122. The edge 122 is circumferentially connected to the outer periphery of the main body 123 and connected to the side 13. The main body 123 has a welding area 121. The protrusion 14 extends in a direction perpendicular to the axis of the through hole 11 and does not exceed the edge 122.

[0053] In practical applications, the electrode post is usually welded after the battery cell connecting piece is manufactured. The bottom 12 includes a main body 123 and an edge 122. The main body 123 is mainly used for laser welding, and the edge 122 is arranged around the main body 123. The edge 122 is mainly used to connect with the side 13. In order to avoid the protrusion 14 from blocking the welding machine from performing welding operations, the length of the protrusion 14 should not exceed the edge 122. This can effectively prevent the protrusion 14 from extending into the welding area 121 of the main body 123 and hindering the normal operation of the welding machine.

[0054] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A cell connector, characterized in that, include: The connecting piece body has through holes; The side portion is connected to the connecting piece body and surrounds the through hole; The bottom portion is connected to the side portion and opposite to the through hole, and a welding area is formed on the bottom portion. A protrusion is connected to the side portion and extends in a direction perpendicular to the axis of the through hole, and the protrusion and the bottom portion are spaced apart.

2. The cell connector according to claim 1, characterized in that, The number of protrusions is multiple, and the multiple protrusions are arranged at intervals around the through hole.

3. The cell connector according to claim 1, characterized in that, The cell connector includes a protective element that covers the welding area and is at least partially located between the protrusion and the bottom.

4. The cell connector according to claim 3, characterized in that, The protective member is connected to the protrusion, or the protective member and the protrusion are spaced apart.

5. The cell connector according to claim 3, characterized in that, Along the direction perpendicular to the axis of the through hole, the length of the protective member is L1, and the length of the welding area is L2, where L1 > 1.3L2.

6. The cell connector according to claim 3, characterized in that, Along the direction perpendicular to the axis of the through hole, the length of the protective member is L1, and the length of the protective member between the protrusion and the bottom is L3, where L3 ≥ 0.2L1.

7. The cell connector according to any one of claims 1-6, characterized in that, The protrusion is recessed on the side opposite to the through hole towards the through hole to form a groove.

8. The cell connector according to any one of claims 1-6, characterized in that, Along the thickness direction of the bottom, the thickness of the bottom is H1, and the distance between the bottom and the protrusion is H2, where H1 > H2.

9. The cell connector according to any one of claims 1-6, characterized in that, The bottom includes a main body and an edge portion. The edge portion is circumferentially connected to the outer periphery of the main body and connected to the side portion. The main body has the welding area. The protrusion extends in a direction perpendicular to the axis of the through hole and does not exceed the edge portion.

10. A battery, characterized in that, Includes the cell connector and electrode as described in any one of claims 1 to 9, wherein the electrode is connected to the bottom side away from the welding area.

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