Full-tab current collector and lithium ion battery

Abstract

The utility model relates to the technical field of lithium ion batteries, and discloses an all-tab current collector and a lithium ion battery, the all-tab current collector comprises a current collector body with a straight edge and a pole handle led out from the straight edge to the direction far away from the current collector body, the pole handle can be bent with the current collector body, and the pole handle is connected with the current collector body. The current collector body is provided with a first groove and a second groove which are concave towards the direction of a battery cell and are used for being welded with the battery cell of the battery, and the first groove and the second groove are arranged to partially coincide with the straight edge; the side, close to the pole handle, of the first groove and the side, close to the pole handle, of the second groove are arranged to partially coincide with the straight edge of the current collector body, so that the straight edge part of the current collector body can be welded to a battery cell, the closing performance of the current collector on the straight edge is enhanced, and the situation that the current collector plate is torn or torn off when the pole handle is bent is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium ion battery technical field, concretely relates to a kind of full tab current collector and lithium ion battery. BACKGROUND

[0002] The market demand of full tab lithium ion battery is increasing, in order to solve the shortcoming that traditional cylindrical lithium ion battery cell and cap are welded by sheet metal sheet, designer comes up with the problem that current collecting disc with pole handle is replaced by sheet metal sheet, but this appears in the bending pole handle, and current collecting disc is easily torn even torn out. UTILITY MODEL CONTENTS

[0003] The utility model aims at overcoming the problem that pole handle is bent and current collecting disc is easily torn even torn out in prior art, and provides a kind of full tab current collector.

[0004] In order to realize the above-mentioned purpose, the utility model provides a kind of full tab current collector on one hand, including: the current collector body with straight edge and one pole handle led to the direction away from the current collector body by the straight edge, the pole handle can be bent between the current collector body, the first recess and the second recess recessed to the direction of cell of the current collector body are provided on the current collector body, for welding with the cell of battery, the first recess and the second recess are set to coincide with the straight edge partially.

[0005] Preferably, semicircular holes are provided at both connection angles of the pole handle and the current collector body.

[0006] Preferably, liquid injection holes are provided on the current collector body, and a plurality of third recesses recessed to the direction of the cell are further provided on the current collector body, and the third recesses are distributed circumferentially around the liquid injection holes.

[0007] Preferably, the ratio of the length of the first recess, the second recess and the third recess to the diameter of the current collector body is 1:2.5~1:3.5.

[0008] Preferably, the ratio of the diameter of the liquid injection hole to the diameter of the current collector body is 1:3.5~1:4.5.

[0009] Preferably, the edge of the current collector body is recessed to the direction of the cell.

[0010] Preferably, overflow holes are provided on the bending line of the pole handle and the current collector.

[0011] Preferably, the ratio of the diameter of the overflow hole to the diameter of the current collector body is 1:4.5~1:6.

[0012] The utility model provides a kind of lithium ion battery, the lithium ion battery includes above-mentioned full tab current collector, the current collector body is welded on the battery cell of the lithium ion battery, the pole handle is used to be connected with cover plate.

[0013] By the above technical solution, the first groove and the second groove are set to coincide with the straight edge of the current collector body on the side close to the pole handle, so that the straight edge part of the current collector body can be welded with the battery cell, and the closure of the current collector on the straight edge is strengthened, thereby avoiding the current collector plate being torn or torn off when the pole handle is bent. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a first view of the structure of the full tab current collector provided by the utility model;

[0015] Figure 2 is a second view of the structure of the full tab current collector provided by the utility model;

[0016] Figure 3 is a structure diagram of another embodiment of the full tab current collector provided by the utility model.

[0017] BRIEF DESCRIPTION OF DRAWINGS

[0018] 1, current collector body; 12, liquid injection hole; 21, first groove; 22, second groove; 23, third groove; 3, pole handle; 31, semicircular hole; 32, flow hole. DETAILED DESCRIPTION

[0019] The specific embodiments of the utility model are described in detail below in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0020] As described above, the utility model provides a kind of full tab current collector on one hand, including the current collector body 1 with straight edge and one pole handle 3 being led to the direction of the current collector body 1 by the straight edge, current collector body 1 is set to be incomplete circular structure with a part missing and the notch is straight edge, the pole handle 3 can be bent between the current collector body 1, current collector body 1 is used to connect the cell of battery, pole handle 3 is used to connect battery cover plate, pole handle 3 is buckled on battery when being bent relative to current collector body 1, first recess 21 and second recess 22 are provided on the current collector body 1 and are concave to the direction of the cell of battery, for welding with the cell of battery, since the end of cell is not flat, if flat bottom current collector is used to weld with cell, then it is easy to appear virtual welding or weld-through condition occurs, it is found in experiment: setting welding recess on current collector is used for welding than on flat bottom current collector welding tension is greater.The first recess 21 and the second recess 22 are set to partially coincide with the straight edge, so that the edge of the current collector body 1 close to the straight edge can also be welded, and the closure of the current collector on the straight edge is strengthened, so that the pole handle 3 cannot lift the current collector body 1 when being bent, thereby avoiding that the current collector body 1 is torn or torn off.

[0021] Combining Figure 1 、 Figure 2 As shown in the utility model, the pole handle 3 and the two connecting angles of the current collector body 1 are both provided with semicircular holes 31, and the two semicircular holes 31 are located on the bending line of the pole handle 3 relative to the current collector body 1. When being bent, a buffer space is provided for the connecting angle, which can effectively avoid that the current collector body 1 is lifted at the connecting angle, maintain better adhesion of the current collector body 1 and the cell, and effectively reduce the possibility that the current collector body 1 is torn.

[0022] In an embodiment of the utility model, the current collector body 1 is provided with a liquid injection hole 12 for injecting electrolyte, and in actual use, the liquid injection hole 12 is usually opened to align the roll core of the cell. The current collector body 1 is also provided with a plurality of third recesses 23 concave to the direction of the cell, and the third recesses 23 are distributed circumferentially around the liquid injection hole 12, which is conducive to strengthening the tension between the current collector body 1 and the cell of the battery.

[0023] In the utility model, the first recess 21, the second recess 22 and the third recess 23 are provided in a rectangular structure, and the ratio of the length of the first recess 21, the second recess 22 and the third recess 23 to the diameter of the current collector body 1 is 1:2.5~1:3.5. If the length is too long, it is not conducive to arrangement and unnecessary materials will be used, causing waste. If the length is too short, the tension between the current collector body 1 and the cell is insufficient, which damages the quality of the battery.

[0024] In the utility model, the ratio of the diameter of the liquid injection hole 12 to the diameter of the current collector body 1 is 1:3.5~1:4.5, the liquid injection hole 12 is only used for adding electrolyte, if the diameter is too large, the distribution of other structures will be affected, and the tension between the current collector body 1 and the battery cell is reduced; if the diameter is too small, the liquid injection is not smooth.

[0025] As Figure 3 As shown in another embodiment of the utility model, in order to seal the arc-shaped edge of the current collector body 1, the edge of the current collector body 1 is concave to the direction of the battery cell, and the concave area is also used for welding, so that the arc-shaped edge of the current collector body 1 is prevented from being warped, and the good adhesion between the current collector body 1 and the battery cell is ensured.

[0026] In the utility model, the overcurrent hole 32 is arranged on the bending line of the pole handle 3 and the current collector body 1, which is convenient for bending and provides a weak point for overcurrent protection, so that the connection between the current collector body 1 and the pole handle 3 can act as a fuse when the battery is short-circuited and overcurrent.

[0027] In one embodiment of the utility model, the ratio of the diameter of the overcurrent hole 32 to the diameter of the current collector body 1 is 1:4.5~1:6, the diameter of the overcurrent hole 32 is too large, which can cause liquid leakage and the connection between the current collector body 1 and the pole handle 3 is too weak and easy to break, and the diameter of the overcurrent hole 32 is too small, which can cause the effect to be not obvious.

[0028] The utility model provides a lithium ion battery in the second aspect, the lithium ion battery includes the full tab current collector, the current collector body 1 is welded on the battery cell of the lithium ion battery, and the pole handle 3 is used to connect the cover plate, by bending the pole handle 3 relative to the current collector body 1, the cover plate is buckled on the battery.

[0029] The preferred embodiments of the utility model are described in detail in combination with the drawings, but the utility model is not limited to this. In the technical concept range of the utility model, the technical scheme of the utility model can be subjected to various simple modifications, and in order to avoid unnecessary repetition, the utility model does not further illustrate various possible combination modes. However, these simple modifications and combinations should also be regarded as the disclosed contents of the utility model and belong to the protection range of the utility model.

Claims

1. A full tab current collector, characterized by, The application relates to a lithium ion battery, which comprises a full-tab current collector as claimed in any one of claims 1-8. The current collector body (1) has straight edges and a tab (3) extending away from the current collector body (1), the tab (3) being capable of being bent with the current collector body (1), the current collector body (1) being provided with a first groove (21) and a second groove (22) recessed towards the direction of the battery cell, the first groove (21) and the second groove (22) being partially coincident with the straight edges.

2. The full tab current collector of claim 1, wherein, Half-circle holes (31) are formed at the two connection angles of the tab (3) and the current collector body (1).

3. The full tab current collector of claim 2, wherein, The current collector body (1) is provided with a liquid injection hole (12), and is further provided with a plurality of third grooves (23) recessed towards the direction of the battery cell, the third grooves (23) being distributed circumferentially around the liquid injection hole (12).

4. The full tab current collector of claim 3, wherein, The ratio of the length of the first groove (21), the second groove (22) and the third groove (23) to the diameter of the current collector body (1) is 1:2.5-1:3.

5.

5. The full tab current collector of claim 3, wherein, The ratio of the diameter of the liquid injection hole (12) to the diameter of the current collector body (1) is 1:3.5-1:4.

5.

6. The full tab current collector according to any one of claims 1 to 5, characterized in that, The edge of the current collector body (1) is recessed towards the direction of the battery cell.

7. The full tab current collector of claim 6, wherein, Overflow holes (32) are formed on the bending line of the tab (3) and the current collector body (1).

8. The full tab current collector of claim 7, wherein, The ratio of the diameter of the overflow hole (32) to the diameter of the current collector body (1) is 1:4.5-1:

6.

9. A lithium-ion battery, characterized by The lithium ion battery comprises the full-tab current collector as claimed in any one of claims 1-8, the current collector body (1) being welded to the battery cell of the lithium ion battery, and the tab (3) being used for connecting a cover plate.

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