Connecting sheet structure and battery cover plate structure

Abstract

The utility model provides a connecting piece structure and a battery cover plate structure, and belongs to the field of new energy batteries. The structure comprises a connecting piece, the connecting piece is of a rectangular structure, an annular boss is arranged at the top of the connecting piece, a tab welding face is arranged in the middle defined by the annular boss, the annular boss is arranged on one side of the connecting piece in the length direction, and a pole welding face is arranged on the other side of the connecting piece in the length direction. By adopting the connecting piece structure and the battery cover plate structure provided by the embodiment of the utility model, the problem of lower safety in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the field of new energy batteries, in particular to a connecting piece structure and a battery cover plate structure. Background Art

[0002] With the rapid development of new energy batteries, the requirements for battery stability and safety performance are becoming increasingly stringent. Among these safety features, the connection between the battery cell and the terminal is particularly important. In battery structures, connecting tabs are typically used to connect the tabs and the terminal, and these tabs are typically welded to the terminal.

[0003] In the prior art, the connecting piece is usually a planar structure. When the tab and the connecting piece are welded, welding slag is usually generated. The welding slag will slide through the surface of the connecting piece to the battery cell, causing a short circuit in the battery cell and triggering a safety accident.

[0004] The connecting piece structure in the prior art is relatively simple, resulting in a low support capacity for welding slag, thereby resulting in low safety. Utility Model Content

[0005] The present invention provides a connecting piece structure and a battery cover structure that can solve the problem of low safety in the prior art. The technical solution is as follows:

[0006] In a first aspect, a connecting piece structure includes: a connecting piece,

[0007] The connecting piece is a rectangular structure, with an annular boss provided on the top of the connecting piece, a tab welding surface provided in the middle of the annular boss, the annular boss provided on one side of the connecting piece along the length direction, and a pole welding surface provided on the other side of the connecting piece along the length direction.

[0008] Optionally, a plurality of the annular bosses are provided, and the plurality of annular bosses are arranged along the width direction of the connecting piece.

[0009] Optionally, a tab insertion hole is provided between two adjacent annular bosses.

[0010] Optionally, a plastic cover is further included, and the plastic cover is arranged on the welding surface of the tab.

[0011] Optionally, the top of the annular boss is flush with the pole welding surface.

[0012] Optionally, the height of the annular boss is 0.2 mm-2 mm.

[0013] In a second aspect, a battery cover plate structure includes the aforementioned connecting piece structure and a cover plate, wherein the cover plate is provided with a liquid injection hole.

[0014] Optionally, an explosion-proof valve is provided on the cover plate.

[0015] The beneficial effects of the technical solution provided by the embodiment of the utility model include at least:

[0016] An embodiment of the utility model provides a connecting piece structure and a battery cover plate structure, in which an annular boss is provided on the top of the connecting piece, and a pole ear welding surface is provided in the middle enclosed by the annular boss. When welding the pole ear and the connecting piece, the pole ear is placed on the pole ear welding surface and welded to the connecting piece. Due to the provision of the annular boss, the welding slag generated during the welding process will be blocked by the annular boss and cannot fall into the battery cell below, thereby preventing the welding slag from causing a short circuit in the battery cell, and can effectively solve the problem of low safety in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the connecting piece structure provided by an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the battery cover structure provided by an embodiment of the present utility model;

[0020] Figure 3 The embodiment of the present utility model provides Figure 3 Schematic diagram of the cross section at AA after matching with the battery cell.

[0021] In the figure: 1-connecting piece; 11-annular boss; 12-tab welding surface; 13-pole welding surface; 14-tab insertion hole; 2-plastic cover; 3-cover plate; 31-liquid injection hole; 32-explosion-proof valve; 4-pole; 5-battery cell; 51-tab. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the connecting piece structure provided by an embodiment of the present utility model; Figure 2 This is a schematic diagram of the battery cover structure provided by an embodiment of the present utility model; Figure 3 The embodiment of the present utility model provides Figure 3Schematic diagram of the cross section at AA after matching with the battery cell. Figures 1 to 3 A connecting piece structure shown includes: a connecting piece 1, which is a rectangular structure, a ring-shaped boss 11 is provided on the top of the connecting piece 1, a pole tab welding surface 12 is provided in the middle of the ring-shaped boss 11, the ring-shaped boss 11 is provided on one side of the connecting piece 1 along the length direction, and a pole welding surface 13 is provided on the other side of the connecting piece 1 along the length direction.

[0024] For example, in an embodiment of the present invention, an annular boss 11 is provided on the top of the connecting piece 1. The annular boss 11 can be a circular ring or a square ring. It is only required that the annular boss 11 can be enclosed to form an annular raised structure. The enclosed middle plane of the annular boss 11 is the tab welding surface 12. When welding the tab to the connecting piece 1, the end of the tab is placed on the tab welding surface 12 and welded. After the welding is completed, the generated welding slag will also fall on the tab welding surface 12 enclosed by the annular boss 11. After the subsequent installation of the battery cover, the cover is fitted with the annular boss 11, so that a closed space is formed inside the annular boss 11, so that the welding slag cannot fall to the outside of the annular boss 11, so that the welding slag will not fall to the battery cell to cause a short circuit and cause a safety accident. The connecting piece in traditional technology is only a flat sheet structure. Compared with the connecting piece in traditional technology, the connecting piece 1 in the embodiment of the utility model is provided with an annular boss 11 to limit the welding slag formed after welding to the inside of the annular boss 11, so that the welding slag will not splash everywhere or fall onto the battery cell to cause a short circuit, thereby improving the safety of the connecting piece structure.

[0025] An embodiment of the present invention provides a connecting piece structure, in which an annular boss 11 is provided on the top of the connecting piece 1, and a tab welding surface 12 is provided in the middle enclosed by the annular boss 11. When welding the tab to the connecting piece 1, the tab is placed on the tab welding surface 12 and welded to the connecting piece 1. Due to the provision of the annular boss 11, the welding slag generated during the welding process will be blocked by the annular boss 11 and cannot fall into the battery cell below, thereby preventing the welding slag from causing a short circuit in the battery cell, and can effectively solve the problem of low safety in the prior art.

[0026] Optionally, a plurality of annular bosses 11 are provided, and the plurality of annular bosses 11 are arranged along the width direction of the connecting piece 1 .

[0027] For example, in an embodiment of the present invention, by providing a plurality of annular bosses 11, the tabs of a plurality of battery cells can be welded separately to the tab welding surfaces 12 formed by the plurality of annular bosses 11 in a multi-cell battery structure, so that there is no interference between the plurality of tabs, thereby improving the stability of the connection between the connecting piece 1 and the tab.

[0028] Optionally, a tab insertion hole 14 is defined between two adjacent annular bosses 11 .

[0029] For example, in the embodiment of the present invention, Figure 1 As shown, the tab insertion hole 14 is a long strip-shaped hole, and the tab insertion hole 14 penetrates the edge of one side of the connecting piece 1. When welding the tab to the connecting piece, the tab can be passed through the tab insertion hole 14 from the outside of the connecting piece, and the annular boss 11 and the tab welding surface 12 can be wrapped around. Alternatively, the tab can be introduced from both sides of each annular boss 11 and wrapped around the connecting piece 1, and the surface where the tab contacts the tab welding surface 12 is welded, thereby improving the convenience of operation when welding the tab. By providing the tab insertion hole 14, the tab can be wrapped around the tab welding surface 12 and the annular boss 11, and the connection between the tab and the connecting piece 1 is made tighter, thereby further improving the stability of the connection between the connecting piece 1 and the tab.

[0030] Optionally, a plastic cover 2 is further included, and the plastic cover 2 is arranged on the tab welding surface 12 .

[0031] For example, in an embodiment of the present invention, after the tab is welded to the tab welding surface 12, the tab can be pressed against the tab welding surface 12 by providing a plastic cover 2. At the same time, the welding slag on the tab welding surface 12 will also be tightly covered by the plastic cover 2, thereby preventing the welding slag from shaking, and further preventing the welding slag from falling into the battery cell and causing a short circuit, thereby further improving the safety of the connecting piece structure.

[0032] Optionally, the top of the annular boss 11 is flush with the pole welding surface 13 .

[0033] For example, in an embodiment of the present invention, when the top of the annular boss 11 is flush with the pole welding surface 13, the tab welding surface 12 is at a lower position than the pole welding surface 13, that is, the tab welding surface 12 forms a groove structure on the connecting piece 1. By setting the connecting piece 1 to such a structure, the overall thickness of the connecting piece 1 can be reduced, thereby reducing the space occupied by the connecting piece 1, thereby improving the space utilization of the battery structure, and further improving the energy density of the battery structure.

[0034] Optionally, the height of the annular boss 11 is 0.2 mm-2 mm.

[0035] For example, in the embodiment of the present utility model, the minimum height of the annular boss 11 is required to block the welding slag inside it, and the maximum height of the annular boss 11 is required to occupy the entire thickness of the connecting piece 1. By setting the height of the annular boss to 0.2mm-2mm, it is possible to both enclose the welding slag inside the annular boss 11 and minimize the thickness of the connecting piece 1, thereby saving the production cost of the connecting piece structure.

[0036] A battery cover plate structure includes the aforementioned connecting piece structure and a cover plate 3 , wherein the cover plate 3 is provided with a liquid injection hole 31 .

[0037] For example, in the embodiment of the present invention, Figure 2 and Figure 3 As shown, a pole 4 is provided on the cover plate 3, a battery cell 5 is provided under the connecting piece 1, and a pole ear 51 is provided on the battery cell 5. The connecting piece 1 is placed on the battery cell 5, and the pole ear 51 is welded to the connecting piece 1, and then covered with a plastic cover 2, and then the cover plate 3 is placed in a direction consistent with the length direction of the connecting piece 1, and covered on the battery cell 5 and the connecting piece 1, and then the pole 4 is placed from the cover plate 3 and welded to the pole welding surface 13 to complete the assembly of the battery structure. A shell is also provided on the outside of the battery cell 5, and the shell and the cover plate 3 form a closed structure. By opening an injection hole 31 on the cover plate 3, it is convenient to inject electrolyte into the battery after the cover plate 3 is installed. After the injection is completed, the injection hole 31 is sealed to form a closed space inside the battery again. By providing the injection hole 31, the operation convenience of the battery cover structure is improved.

[0038] Optionally, an explosion-proof valve 32 is provided on the cover plate 3 .

[0039] For example, in an embodiment of the present invention, an explosion-proof valve 32 is provided. The fundamental cause of thermal runaway of the battery cell is the accumulation of heat due to the exothermic side reaction within the battery cell. The rate of heat exchange from the battery cell to the outside is less than the rate of heat accumulation, and the temperature continues to rise until it reaches the ignition point, causing combustion and explosion. To prevent thermal runaway accidents and avoid an imbalance in the internal and external pressures of the battery structure, and considering that lithium batteries will instantly produce a large amount of toxic gases when they catch fire, timely and targeted pressure relief and gas discharge are required, the explosion-proof valve 32 can achieve the requirements of maintaining the internal and external pressure balance of the battery structure and the targeted release of gas, serving as a passive safety protection measure for the battery system to prevent thermal runaway. By providing the explosion-proof valve 32, the safety performance of the battery cover structure is improved.

[0040] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present invention belongs. The terms "first", "second" and similar words used in the specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "include" or "comprising" mean that the elements or objects appearing before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", and "right" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] The above description is only an optional embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A connecting piece structure, characterized in that: include: Connecting piece (1), The connecting piece (1) is a rectangular structure, an annular boss (11) is provided on the top of the connecting piece (1), a tab welding surface (12) is provided in the middle of the annular boss (11), the annular boss (11) is provided on one side of the connecting piece (1) along the length direction, and a pole welding surface (13) is provided on the other side of the connecting piece (1) along the length direction.

2. The connecting piece structure according to claim 1, characterized in that: A plurality of annular bosses (11) are provided, and the plurality of annular bosses (11) are arranged along the width direction of the connecting piece (1).

3. The connecting piece structure according to claim 2, characterized in that: A tab insertion hole (14) is provided between two adjacent annular bosses (11).

4. The connecting piece structure according to claim 1, characterized in that: It also includes a plastic cover (2), which is arranged on the tab welding surface (12).

5. The connecting piece structure according to claim 1, characterized in that: The top of the annular boss (11) is flush with the pole welding surface (13).

6. The connecting piece structure according to claim 5, characterized in that: The height of the annular boss (11) is 0.2 mm to 2 mm.

7. A battery cover structure, comprising the connecting piece structure according to any one of claims 1 to 6, characterized in that: It also includes a cover plate (3), on which a liquid injection hole (31) is provided.

8. The battery cover structure according to claim 7, characterized in that: An explosion-proof valve (32) is provided on the cover plate (3).

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