A top structure of an electric cell

Abstract

The utility model discloses a kind of top structure of battery cell, including top cover, top cover is equipped with the through-hole for the positive and negative pole of battery cell to extend, circuit is provided on top cover, the edge of top cover at through-hole is extended with tab into through-hole, the positive and negative pole of battery cell is equipped with the recess from top downwards to the recess of tab, tab one end is embedded recess and the positive and negative pole of battery cell is welded, other end and the circuit on top cover are electrically connected. By tab in the edge of top cover extending into through-hole, after the positive and negative pole of battery cell extends from through-hole, by tab embedded into the recess of the positive and negative pole of battery cell, then welded together, so that tab and the positive and negative pole of battery cell connection is more stable, to improve the safety of new energy automobile battery.

Description

Technical Field

[0001] This utility model relates to the field of battery cells, and in particular to a top structure of a battery cell. Background Technology

[0002] Due to the characteristics of battery cells, the temperature and charge / discharge current of new energy vehicle batteries must be monitored in real time throughout their operation. Therefore, a circuit needs to be installed on top of the battery cell to monitor these parameters. Traditional battery cell top structures include a top cover and a flexible thin circuit board. The flexible thin circuit board is glued to the top cover, which has through-holes through which the positive and negative terminals of the battery cell extend. These terminals have upward-protruding extensions. The tabs on the flexible thin circuit board are welded to the top of these protruding extensions. Because of the height difference between the top of the protruding extensions and the flexible thin circuit board, the tabs on the flexible thin circuit board need to be tilted upwards to connect with the protruding extensions of the battery cells. Vibrations during vehicle operation can easily cause these tabs to detach, compromising the safety of new energy vehicle batteries. Utility Model Content

[0003] The present invention provides a more stable top structure for connecting the tabs to the positive and negative terminals of the battery cell, so as to improve the safety of new energy vehicle batteries.

[0004] The battery cell top structure of this utility model includes a top cover, on which a through hole is provided for the positive and negative terminals of the battery cell to extend out. A circuit is provided on the top cover. An electrode tab extends from the edge of the top cover at the through hole into the through hole. The positive and negative terminals of the battery cell are provided with a groove that is recessed from the top down to the electrode tab. One end of the electrode tab is embedded in the groove and welded to the positive and negative terminals of the battery cell, and the other end is electrically connected to the circuit on the top cover.

[0005] The battery cell top structure of this utility model features tabs extending from the edge of the top cover into a through-hole. After the positive and negative terminals of the battery cell extend from the through-hole, the tabs are embedded into the grooves of the positive and negative terminals and then welded together. This makes the connection between the tabs and the positive and negative terminals more stable, thereby improving the safety of the new energy vehicle battery. Furthermore, since the circuitry is directly mounted on the top cover with tabs extending from its edge, the number of circuit boards is reduced, further stabilizing the connection between the tabs and the positive and negative terminals and enhancing the safety of the new energy vehicle battery. Additionally, the direct mounting of the circuitry on the top cover reduces the risk of circuit boards detaching from the top cover, and also lowers costs.

[0006] As a preferred embodiment of this utility model, the bottom of the groove and the bottom of the tab are on the same horizontal plane.

[0007] In a preferred embodiment of this utility model, the sidewall of the electrode abuts against the sidewall of the groove.

[0008] As a preferred embodiment of this utility model, the top cover is an aluminum substrate top cover.

[0009] As a preferred embodiment of this utility model, the aluminum substrate top cover includes a metal base layer, an insulating layer, and a circuit layer, with the insulating layer located on the metal base layer and the circuit layer located on the insulating layer.

[0010] As a preferred embodiment of this utility model, the edge of the metal base layer is provided with a flange that is welded to the outer shell of the battery cell.

[0011] As a preferred embodiment of this utility model, electronic components are soldered onto the circuit layer.

[0012] As a preferred embodiment of this utility model, green oil is coated on the circuit layer. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the top structure of the battery cell of this utility model;

[0014] Figure 2 This is a top view of the top cover of this utility model;

[0015] Figure 3 This is a schematic diagram of the explosion of the top cover of this utility model;

[0016] Figure 4 This is a schematic diagram of the top cover and the battery cell casing after welding. Detailed Implementation

[0017] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] In this utility model, it should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0019] A cell top structure, such as Figure 1 - Figure 2As shown, it includes a top cover 1, a through hole 2 on which the positive and negative terminals of the power cell extend, a circuit 3 on the top cover, and an electrode tab 4 extending from the edge of the top cover into the through hole. The positive and negative terminals of the power cell are provided with a groove 5 that is recessed from the top down to the electrode tab. One end of the electrode tab is embedded in the groove and welded to the positive and negative terminals of the power cell, and the other end is electrically connected to the circuit on the top cover.

[0020] By extending tabs into the through-holes at the edge of the top cover, the positive and negative terminals of the battery cell extend out of the through-holes and are then embedded into the grooves of the positive and negative terminals of the battery cell by the tabs, and then welded together. This makes the connection between the tabs and the positive and negative terminals of the battery cell more stable, thereby improving the safety of new energy vehicle batteries. In addition, since the circuit is directly set on the top cover and the tabs extend from the edge of the top cover, the number of circuit boards is reduced, making the connection between the tabs and the positive and negative terminals of the battery cell even more stable, further improving the safety of new energy vehicle batteries. Furthermore, since the circuit is directly set on the top cover, the number of circuit boards is reduced, avoiding the risk of the circuit boards falling off the top cover, and the reduction of circuit boards also further reduces costs.

[0021] like Figure 3 As shown, the top cover is an aluminum substrate top cover, which includes a metal base layer 11, an insulating layer 12, and a circuit layer 13. The insulating layer is located on the metal base layer, and the circuit layer is located on the insulating layer, as shown. Figure 2 The black area on the tab 4 shown is the surface copper foil on the circuit layer, which is connected to the circuit lines on the circuit layer. Electronic components 9 for real-time monitoring of battery operating temperature and charge / discharge current are soldered onto the circuit layer. Green solder mask is applied to the circuit layer, covering the unsoldered lines and substrate of the printed circuit board.

[0022] like Figure 1 and Figure 4 As shown, the metal base layer has a flange 8 that is welded downwards to the battery cell housing 7. The flange 8 makes it easier to weld the top cover to the battery cell housing 7.

[0023] The above embodiments are only used to illustrate the detailed solution of this utility model. This utility model is not limited to the above detailed solution, that is, it does not mean that this utility model must rely on the above detailed solution to be implemented. Those skilled in the art should understand that any improvement to this utility model, equivalent substitution of the raw materials of this utility model product, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of this utility model.

Claims

1. A battery cell top structure, comprising a top cover (1), wherein the top cover is provided with through holes (2) for the positive and negative terminals of the battery cell to extend out, characterized in that, A circuit (3) is provided on the top cover. An electrode tab (4) extends from the edge of the top cover into the through hole. The positive and negative terminals (5) of the battery cell are provided with a groove (6) that is recessed from the top down to the electrode tab. One end of the electrode tab is embedded in the groove and welded to the positive and negative terminals of the battery cell, and the other end is electrically connected to the circuit on the top cover.

2. The cell top structure according to claim 1, characterized in that, The bottom of the groove is at the same level as the bottom of the tab.

3. The cell top structure according to claim 1, characterized in that, The sidewall of the tab abuts against the sidewall of the groove.

4. The cell top structure according to claim 1, characterized in that, The top cover is an aluminum substrate top cover.

5. The cell top structure according to claim 4, characterized in that, The aluminum substrate top cover includes a metal base layer (11), an insulating layer (12), and a circuit layer (13), with the insulating layer located on the metal base layer and the circuit layer located on the insulating layer.

6. The cell top structure according to claim 4, characterized in that, The metal base layer has a flange (8) that is welded to the battery cell casing (7) at the bottom edge.

7. The cell top structure according to claim 4, characterized in that, Electronic components are soldered onto the circuit layer (9).

8. The cell top structure according to claim 4, characterized in that, Green oil is applied to the circuit layer.

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