Top cover assembly and battery monomer with same

Abstract

The utility model discloses a top cover assembly and a battery monomer with the top cover assembly. The top cover assembly is used for the battery monomer and comprises a bottom plate and a pole body, a mounting hole and a fusing structure spaced from the mounting hole are arranged on the bottom plate; and the pole body is arranged in the mounting hole in a penetrating manner. According to the top cover assembly disclosed by the utility model, the fusing structure is arranged on the bottom plate and is separated from the pole column body, so that the current in the pole group can be guided to the pole column without adding a connecting piece on the pole column body, the number of parts of the top cover assembly can be reduced, and when the current in a circuit exceeds a rated value or the temperature of a battery rises to a certain value, the fusing structure can be used for guiding the current to the pole column body. The fusing structure can be fused to disconnect the circuit so as to protect the single battery and the electric appliance from being damaged, and the electricity utilization safety of the single battery is improved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and particularly relates to a top cover assembly and a battery cell having the same. Background Art

[0002] In the prior art, a connecting piece is provided in the top cover assembly, and a fusing structure is arranged on the connecting piece, and the number of parts of the top cover assembly is relatively large. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a top cover assembly, which can increase the power consumption safety of the battery cell while having a smaller number of parts.

[0004] The utility model also provides a battery cell, which includes the above-mentioned top cover assembly.

[0005] The top cover assembly according to an embodiment of the utility model is used for a battery cell and includes a bottom plate and a pole column body. An installation hole and a fusing structure spaced apart from the installation hole are provided on the bottom plate. The fusing structure includes a fusing groove and a fusing hole. The two ends of the fusing groove are open along the width direction of the bottom plate, and the fusing hole is provided on the bottom wall of the fusing groove. The pole column body is inserted into the installation hole, and the minimum cross-sectional area s of the fusing structure along the thickness direction of the fusing structure satisfies 4mm2 < s < 20mm2.

[0006] According to the top cover assembly of the embodiment of the utility model, by arranging the fusing structure on the bottom plate and spacing it from the pole column body, the current in the pole group can be guided to the pole column without adding a connecting piece on the pole column body, which can reduce the number of parts of the top cover assembly. And when the current in the circuit exceeds the rated value or the temperature of the battery rises to a certain value, the fusing structure can be fused to disconnect the circuit, so as to protect the battery cell and the electrical appliance from being damaged and increase the power consumption safety of the battery cell.

[0007] In some embodiments of the utility model, the top cover assembly further includes a sealing ring, and the sealing ring is sleeved on the outer peripheral wall of the pole column body.

[0008] In some embodiments of the utility model, the installation hole includes an assembly hole and a positioning hole, the assembly hole and the positioning hole are arranged in sequence along the axial direction of the installation hole, the pole column body includes an assembly section and a positioning section, the assembly section and the positioning section are arranged in sequence along the axial direction of the pole column body, the assembly section is inserted into the assembly hole, and the positioning section is inserted into the positioning hole.

[0009] In some embodiments of the present utility model, along the length direction of the bottom plate, the inner diameter W1 of the assembly hole and the outer diameter W2 of the position of the pole column body that cooperates with the sealing ring satisfy: W2 - W1 > 1 mm.

[0010] In some embodiments of the present utility model, along the length direction of the bottom plate, the minimum distance H between the inner peripheral wall of the assembly hole and the outer peripheral wall of the position of the pole column body that cooperates with the sealing ring satisfies: H > 0.5 mm.

[0011] In some embodiments of the present utility model, the outer diameter W3 of the positioning section and the outer diameter W4 of the sealing ring satisfy: W3 > W4.

[0012] In some embodiments of the present utility model, the dimension L1 of the positioning section along the thickness direction of the positioning section and the dimension L2 of the bottom plate along the thickness direction of the bottom plate satisfy: L2 - L1 > 0.5 mm, and L1 > 0.5 mm, L2 > 1.2 mm.

[0013] In some embodiments of the present utility model, the assembly section is welded to the inner peripheral wall of the assembly hole.

[0014] The battery cell according to the embodiment of the present utility model includes the above-mentioned top cover assembly.

[0015] In the battery cell according to the embodiment of the present utility model, by arranging the fusing structure on the bottom plate and spacing it from the pole column body, the current in the pole group can be guided to the pole column without adding a connecting piece to the pole column body, which can reduce the number of parts of the top cover assembly. And when the current in the circuit exceeds the rated value or the temperature of the battery rises to a certain value, the fusing structure can fuse to disconnect the circuit, so as to protect the battery cell and the electrical appliance from being damaged and increase the electrical safety of the battery cell.

[0016] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0018] Figure 1 is an exploded view of the top cover assembly according to the embodiment of the present utility model;

[0019] Figure 2 is a perspective view of the top cover assembly according to the embodiment of the present utility model;

[0020] Figure 3 is a top view of the top cover assembly according to the embodiment of the present utility model;

[0021] Figure 4 is a cross-sectional view of a top cover assembly according to an embodiment of the present utility model;

[0022] Figure 5 is a perspective view of the bottom plate of the top cover assembly according to an embodiment of the present utility model;

[0023] Figure 6 is a top view of the bottom plate of the top cover assembly according to an embodiment of the present utility model;

[0024] Figure 7 is a cross-sectional view of the bottom plate of the top cover assembly according to an embodiment of the present utility model.

[0025] Reference numerals:

[0026] 100, top cover assembly;

[0027] 1, bottom plate;

[0028] 11, mounting hole; 111, assembly hole; 112, positioning hole; 12, fusing structure; 121, fusing groove; 122, fusing hole;

[0029] 2, pole body;

[0030] 21, assembly section; 22, positioning section;

[0031] 3, protective rubber sleeve; 4, sealing ring; 5, insulating patch. Detailed implementation manners

[0032] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model may be understood according to specific circumstances.

[0035] Next, reference is made to Figures 1-7 describe the top cover assembly 100 according to an embodiment of the present utility model.

[0036] As Figure 1 shown, the top cover assembly 100 according to an embodiment of the present utility model includes a bottom plate 1, a pole column body 2, and a protective rubber sleeve 3.

[0037] Specifically, the top cover assembly 100 is used for a battery cell. The bottom plate 1 is provided with an installation hole 11 and a fusing structure 12 spaced apart from the installation hole 11. The fusing structure 12 includes a fusing groove 121 and a fusing hole 122. The fusing structure 12 includes a fusing groove 121 and a fusing hole 122. The two ends of the fusing groove 121 are open along the width direction of the bottom plate, and the fusing hole 122 is provided on the bottom wall of the fusing groove 121. The pole column body 2 passes through the installation hole 11. At this time, it is not necessary to add a connecting piece on the pole column body 2 to cooperate with the pole group in the battery cell to guide the current in the pole group to the pole column, which can reduce the number of parts of the top cover assembly 100. Moreover, the original fusing structure 12 provided on the connecting piece can be provided on the bottom plate 1. When the current in the circuit exceeds the rated value or the temperature of the battery rises to a certain value, the fusing structure 12 will fuse to disconnect the circuit, so as to protect the battery cell and the electrical appliance from being damaged and increase the electrical safety of the battery cell.

[0038] AsFigure 1 and Figure 3 As shown in Figure 3 , the top cover assembly 100 further includes a protective rubber sleeve 3, which is sleeved outside the installation groove and is used to seal the fusing structure 12. When the current in the circuit exceeds the rated value or the temperature of the battery rises to a certain value, when the fusing structure 12 fuses, the protective rubber sleeve 3 can keep the fusing process inside the fusing structure 12, avoiding the fusing process affecting other positions of the bottom plate 1 and preventing the fusing process from damaging other components such as the pole column body 2.

[0039] For the top cover assembly 100 according to the embodiment of the present invention, by arranging the fusing structure 12 on the bottom plate 1 and spacing it apart from the pole column body 2, the current in the electrode group can be guided to the pole column without adding a connecting piece to the pole column body 2, which can reduce the number of parts of the top cover assembly 100. And when the current in the circuit exceeds the rated value or the temperature of the battery rises to a certain value, the fusing structure 12 can fuse to disconnect the circuit, so as to protect the battery cell and the electrical appliance from being damaged and increase the electrical safety of the battery cell.

[0040] In some embodiments of the present invention, the minimum cross-sectional area s of the fusing structure 12 in the thickness direction of the fusing structure 12 (such as the a direction shown in Figure 1 ) satisfies 4mm Figure 1 < s < 20mm 2 < s < 20mm 2 As shown in Figure 5 , Figure 6 and Figure 7 , the fusing structure 12 includes a fusing groove 121 and a fusing hole 122. The fusing structure 12 includes a fusing groove 121 and a fusing hole 122. The two ends of the fusing groove 121 are open along the width direction of the bottom plate. The fusing hole 122 is arranged on the bottom wall of the fusing groove 121. The fusing hole 122 penetrates the bottom plate 1 in the thickness direction of the bottom plate 1. The fusing hole 122 extends along the width direction of the bottom plate 1 (such as the c direction shown in Figure 1 ). The minimum cross-sectional area of the fusing structure 12 is the position where the area of the fusing hole 122 in the thickness direction of the fusing structure 12 is the largest.

[0041] It can be understood that the minimum cross-sectional area s in the thickness direction of the fusing structure 12 can be 4mm 2 、6mm 2 、8mm 2 、10mm 2 、12mm 2 、14mm 2 、16mm 2 、18mm 2 or 20mm 2 ​​​​​​​​The minimum cross-sectional area s in the thickness direction of the fusing structure 12 is not less than 4 mm, which can prevent the size of the minimum cross-sectional area s in the thickness direction of the fusing structure 12 from being too small, avoid the fracture of the fusing structure 12, and prevent the failure of the battery cell; the minimum cross-sectional area s in the thickness direction of the fusing structure 12 is not greater than 20 mm, which can prevent the minimum cross-sectional area s in the thickness direction of the fusing structure 12 from being too large, avoid the fusing structure 12 from being unable to fuse when the current in the circuit exceeds the rated value or the temperature of the battery rises to a certain value, and prevent the short circuit or thermal runaway of the battery cell.

[0042] In some embodiments of the present invention, such as Figure 2 and Figure 4 shown, the top cover assembly 100 further includes a sealing ring 4, and the sealing ring 4 is sleeved on the outer peripheral wall of the pole column body 2. The sealing ring 4 can isolate the electrolyte in the battery cell from the external environment, prevent the leakage of the electrolyte, and ensure the normal operation of the battery. And the sealing ring 4 can prevent air from entering the interior of the battery cell, thereby preventing the occurrence of oxidation reaction.

[0043] In addition, the sealing ring 4 has good airtightness, can prevent gas exchange, thereby maintaining the balance of the internal air pressure of the battery cell, and is beneficial to the stable operation of the battery cell.

[0044] Furthermore, as Figure 1 and Figure 5 shown, the mounting hole 11 includes an assembly hole 111 and a positioning hole 112. The assembly hole 111 and the positioning hole 112 are arranged in sequence along the axial direction of the mounting hole 11 (such as Figure 1 shown in the a direction). The pole column body 2 includes an assembly section 21 and a positioning section 22. The assembly section 21 and the positioning section 22 are arranged in sequence along the axial direction of the pole column body 2. The assembly section 21 passes through the assembly hole 111, and the positioning section 22 passes through the positioning hole 112. It can be understood that the cooperation between the positioning section 22 and the positioning hole 112 can limit the assembly of the pole column body 2 and the bottom plate 1, increase the reliability of the cooperation between the assembly section 21 and the assembly hole 111, and increase the reliability of the assembly of the pole column body 2 and the bottom plate 1.

[0045] In some embodiments of the present invention, the assembly section 21 is welded to the inner peripheral wall of the assembly hole 111. The connection structure of the welded connection is relatively simple, and the airtightness and water tightness of the welded connection are both good. The structure has large rigidity and good integrity, and can meet the connection requirements of various complex structures. And the pole column body 2 is directly welded to the bottom plate 1 to maximize the effective space inside the battery cell.

[0046] In some embodiments of the present invention, such as Figure 4 shown, along the length direction of the bottom plate 1 (such as Figure 1In the b direction shown, the inner diameter W1 of the assembly hole 111 and the outer diameter W2 of the position of the pole column body 2 that cooperates with the sealing ring 4 satisfy: W2 - W1 > 1 mm. For example, W2 - W1 can be 1.01 mm, 1.02 mm, 1.03 mm... This can make the position where the bottom plate 1 is welded to the pole column body 2 far from the sealing ring 4, avoiding damage to the sealing ring 4 when the bottom plate 1 is welded to the pole column body 2 and preventing the sealing effect of the top cover assembly 100 from being poor.

[0047] In some embodiments of the present utility model, as Figure 4 shown, along the length direction of the bottom plate 1, the minimum distance H between the inner peripheral wall of the assembly hole 111 and the outer peripheral wall of the position of the pole column body 2 that cooperates with the sealing ring 4 satisfies: H > 0.5 mm. For example, the minimum distance H between the inner peripheral wall of the assembly hole 111 and the outer peripheral wall of the position of the pole column body 2 that cooperates with the sealing ring 4 can be 0.51 mm, 0.52 mm, 0.53 mm... This can make the minimum distance H between the inner peripheral wall of the assembly hole 111 and the outer peripheral wall of the position of the pole column body 2 that cooperates with the sealing ring 4 more reasonable. When the assembly section 21 and the positioning section 22 are eccentric, it can make the position where the bottom plate 1 is welded to the pole column body 2 far from the sealing ring 4, avoiding damage to the sealing ring 4 when the bottom plate 1 is welded to the pole column body 2 and preventing the sealing effect of the top cover assembly 100 from being poor.

[0048] In some embodiments of the present utility model, as Figure 4 shown, the outer diameter W3 of the positioning section 22 and the outer diameter W4 of the sealing ring 4 satisfy: W3 > W4. It can be understood that the outer diameter of the positioning section 22 is larger, and all parts of the axial end face of the sealing ring 4 abut against the positioning section 22, ensuring the sealing effect of the sealing ring 4.

[0049] In some embodiments of the present utility model, as Figure 4 shown, the dimension L1 of the positioning section 22 in the thickness direction of the positioning section 22 and the dimension L2 of the bottom plate 1 in the thickness direction of the bottom plate 1 satisfy: L2 - L1 > 0.5 mm, and L1 > 0.5 mm, L2 > 1.2 mm.

[0050] It can be understood that the difference between the dimension L2 of the bottom plate 1 in the thickness direction and the dimension L1 of the positioning section 22 in the thickness direction can be 0.51 mm, 0.52 mm, 0.53 mm... That is, the dimension of the assembly section 21 in the thickness direction is greater than 0.5 mm, which can increase the assembly thickness of the assembly section 21 and improve the assembly accuracy of the assembly section 21.

[0051] It can be understood that the dimension L1 of the positioning section 22 in the thickness direction can be 0.51 mm, 0.52 mm, 0.53 mm... That is, the assembly thickness of the pole column body 2 and the bottom plate 1 is relatively large, which can increase the assembly accuracy of the positioning section 22.

[0052] It can be understood that the dimension L2 in the thickness direction of the bottom plate 1 can be 1.21 mm, 1.22 mm, 1.23 mm... The thickness of the bottom plate 1 is relatively large, which can increase the structural strength of the bottom plate 1 and can also increase the structural strength of the top cover assembly 100.

[0053] In some embodiments of the present invention, such as Figure 1 and Figure 4 as shown, the top cover assembly 100 further includes an insulating patch 5. The insulating patch 5 is provided on the side of the pole column body 2 close to the electrode group. The electrode group in the battery cell can transfer current to the bottom plate 1, and then transfer it to the pole column body 2 through the bottom plate 1, and then transfer it to the electrical appliance by the pole column body 2.

[0054] The battery cell according to the embodiment of the present invention includes the above-mentioned top cover assembly 100.

[0055] For the battery cell according to the embodiment of the present invention, by arranging the fusing structure 12 on the bottom plate 1 and spacing it apart from the pole column body 2, it is possible to guide the current in the electrode group to the pole column without adding a connecting piece on the pole column body 2, which can reduce the number of parts of the top cover assembly 100. And when the current in the circuit exceeds the rated value or the temperature of the battery rises to a certain value, the fusing structure 12 can fuse to disconnect the circuit, so as to protect the battery cell and the electrical appliance from being damaged and increase the electrical safety of the battery cell.

[0056] The other constitutions and operations of the top cover assembly 100 according to the embodiment of the present invention and the battery cell having the same are known to those of ordinary skill in the art and will not be described in detail here.

[0057] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0058] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A top cover assembly, characterized in that, For a battery cell and comprising: A bottom plate, on which mounting holes and a fusing structure spaced apart from the mounting holes are provided. The fusing structure includes a fusing groove and a fusing hole. The two ends of the fusing groove are open along the width direction of the bottom plate, and the fusing hole is provided on the bottom wall of the fusing groove; A pole column body, which is inserted into the mounting hole; Among them, the minimum cross-sectional area s of the fusing structure in the thickness direction of the fusing structure satisfies 4mm 2 < s < 20mm 2 .

2. The top cover assembly according to claim 1, characterized in that, Further comprising: A sealing ring, which is sleeved on the outer peripheral wall of the pole column body.

3. The top cover assembly according to claim 2, characterized in that, The mounting hole includes an assembly hole and a positioning hole, and the assembly hole and the positioning hole are arranged in sequence along the axial direction of the mounting hole. The pole column body includes an assembly section and a positioning section, and the assembly section and the positioning section are arranged in sequence along the axial direction of the pole column body. The assembly section is inserted into the assembly hole, and the positioning section is inserted into the positioning hole.

4. The top cover assembly according to claim 3, characterized in that, Along the length direction of the bottom plate, the inner diameter W1 of the assembly hole and the outer diameter W2 of the position of the pole column body that cooperates with the sealing ring satisfy: W2 - W1 > 1 mm.

5. The top cover assembly according to claim 3, characterized in that, Along the length direction of the bottom plate, the minimum distance H between the inner peripheral wall of the assembly hole and the outer peripheral wall of the position of the pole column body that cooperates with the sealing ring satisfies: H > 0.5 mm.

6. The top cover assembly according to claim 3, characterized in that, The outer diameter W3 of the positioning section and the outer diameter W4 of the sealing ring satisfy: W3 > W4.

7. The top cover assembly according to claim 3, characterized in that The dimension L1 of the positioning section along the thickness direction of the positioning section and the dimension L2 of the bottom plate along the thickness direction of the bottom plate satisfy: L2 - L1 > 0.5 mm, and L1 > 0.5 mm, L2 > 1.2 mm.

8. The top cover assembly according to claim 3, characterized in that, The assembly section is welded to the inner peripheral wall of the assembly hole.

9. A battery cell, characterized in that, Comprising the top cover assembly according to any one of claims 1 - 8.

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