Secondary battery structure

Abstract

The utility model provides a secondary battery structure which comprises a battery cell and a top cover structure, and a tab is arranged on the battery cell; a pole is embedded in a pole hole of the top cover structure, the pole is used for being connected with a tab, and a supporting structure is further arranged on the surface of one side, facing the battery cell, of the top cover structure in a protruding manner, so that the supporting structure provides a supporting effect for the tab. According to the utility model, the problems that the tab is easy to bend after the battery core is combined or the tab is in contact with the pole piece due to excessive redundancy to cause internal short circuit and serious potential safety hazard exist in a direct welding mode of the tab and the pole column in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, in particular to a secondary battery structure. Background Art

[0002] In the prior art, the secondary battery structure directly welds the pole lugs and poles thereon, thereby eliminating the adapter between the pole lugs and poles, thereby increasing the thermal conductivity of the pole lugs, which is beneficial to improving the heat dissipation effect of the battery cell. In addition, it can also effectively reduce the problem of poor welding caused by the pole lugs, thereby helping to improve the production efficiency of the secondary battery structure.

[0003] However, the above-mentioned method of directly welding the tabs to the poles is prone to bending of the tabs after the battery cells are assembled, or the tabs may contact the pole pieces due to excessive redundancy, causing internal short circuits, posing serious safety hazards. Utility Model Content

[0004] The main purpose of the utility model is to provide a secondary battery structure to solve the problem that in the prior art, the pole ear and the pole are directly welded, and after the battery cell is assembled, the pole ear is prone to bending, or the pole ear is in contact with the pole piece due to excessive redundancy, causing an internal short circuit, which poses a serious safety hazard.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a secondary battery structure, including a battery cell and a top cover structure, wherein a pole ear is arranged on the battery cell; a pole is embedded in a pole hole of the top cover structure, the pole is used to connect with the pole ear, and a support structure is protrudingly arranged on the surface of one side of the top cover structure facing the battery cell, so that the support structure provides support for the pole ear.

[0006] Furthermore, the supporting structure is a non-conductive structure.

[0007] Furthermore, the support structure includes a support boss and a support gasket, wherein there are at least two support bosses, at least two support bosses are arranged on the top cover structure at intervals around the outer peripheral side of the pole, and one end of the support boss is connected to the side surface of the top cover structure facing the battery cell; the support gasket is arranged on the other end of the support boss and is arranged at a distance from the pole, and when the pole ear and the pole are in a connected state, the pole ear at the connection is located between the support gasket and the pole, and the outer contour line of the projection of the support gasket in its thickness direction is located outside the outer contour line of the projection of the pole in its thickness direction.

[0008] Furthermore, the top cover structure includes a top cover sheet and a plastic layer, the plastic layer is arranged on the side of the top cover sheet facing the battery cell, the pole hole passes through the plastic layer and at least part of the top cover sheet, and the support boss is protrudingly arranged on the surface of the plastic layer facing the battery cell.

[0009] Furthermore, the supporting gasket is detachably connected to the supporting boss.

[0010] Furthermore, the supporting gasket is snap-fitted with the supporting boss.

[0011] Furthermore, the supporting gasket is magnetically engaged with the supporting boss.

[0012] Furthermore, the outer contour line of the projection of the support gasket in the thickness direction thereof is one of a circle, a polygon and an ellipse.

[0013] Furthermore, the poles include a positive pole and a negative pole, and the positive pole and the negative pole are arranged at intervals in the length direction of the top cover structure; there are two supporting structures.

[0014] Furthermore, the thickness B1 of the support gasket and the thickness B2 of the weld used for welding the pole lug and the pole satisfy: B1≥B2.

[0015] By applying the technical solution of the utility model, a support structure is protruded on the surface of one side of the top cover structure facing the battery cell, and the support structure can provide support for the redundant pole ears, which is beneficial to avoid the internal short circuit caused by the contact between the pole ears and the pole pieces due to excessive redundancy of the pole ears, thereby ensuring the safety of the secondary battery structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 It shows a schematic structural diagram of a state before two battery cells of a secondary battery structure according to an optional embodiment of the utility model are combined;

[0018] Figure 2 Shows Figure 1 A schematic diagram of the side view of the secondary battery structure after two cells are combined;

[0019] Figure 3 The figure shows a schematic side view of the structure of a secondary battery in the prior art after two cells are combined.

[0020] The above drawings include the following reference numerals:

[0021] 10. Battery cell; 11. Tab;

[0022] 20. Top cover structure; 21. Support structure; 211. Support boss; 212. Support gasket; 22. Positive pole; 23. Negative pole;

[0023] 30. Weld bead structure. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In order to solve the problem that the tabs are easily bent after the battery cells are assembled by directly welding the tabs to the poles in the prior art, or the tabs are in contact with the poles due to excessive redundancy, resulting in internal short circuits, which poses serious safety hazards, please refer to Figure 3 After the two battery cells 10 are combined, the tabs 11 are bent due to redundancy. In order to solve the problem of redundant bending of the tabs 11 after the two battery cells 10 are combined, the utility model provides a secondary battery structure.

[0026] like Figure 1 and Figure 2 As shown, the secondary battery structure includes a battery cell 10 and a top cover structure 20, wherein a pole ear 11 is arranged on the battery cell 10; a pole is embedded in the pole hole of the top cover structure 20, and the pole is used to connect with the pole ear 11, and a support structure 21 is protrudingly arranged on the surface of one side of the top cover structure 20 facing the battery cell 10, so that the support structure 21 provides support for the pole ear 11.

[0027] By protruding the support structure 21 on the surface of the top cover structure 20 facing the battery cell 10, the support structure 21 can provide support for the tab 11 after the battery cell 10 is assembled, which is beneficial to avoid the tab 11 and the pole piece from contacting each other due to excessive redundancy of the tab 11, thereby ensuring the safety of the secondary battery structure. Figure 1 and Figure 2 As shown, the secondary battery structure in the present application includes two battery cells 10. The present application takes two battery cells 10 as an example for explanation. Two tabs 11 are provided on the two battery cells 10, one of which is a positive tab and the other is a negative tab. On the same battery cell 10, the positive tab includes a plurality of tab units stacked along its thickness direction, and the negative tab also includes a plurality of tab units stacked along its thickness direction. Preferably, the support structure 21 is a non-conductive structure.

[0028] It should be noted that in this application, Figure 1As shown, the width direction of the pole ear 11 specifically refers to Figure 1 The left and right directions in the figure, the length direction of the pole ear 11 (the paving direction of the pole ear 11) specifically refers to Figure 1 The up and down directions in .

[0029] It should be noted that, in the present application, the tabs 11 can be equal tabs or non-equal tabs. When the lengths and widths of multiple tab units in the same tab 11 are exactly the same, the tab 11 is an equal tab. Naturally, on the contrary, when the lengths and / or widths of multiple tab units in the same tab 11 are not exactly the same, the tab 11 is a non-equal tab.

[0030] like Figure 1 and Figure 2 As shown, the support structure 21 includes a support boss 211 and a support gasket 212, wherein there are at least two support bosses 211, and at least two support bosses 211 are arranged on the top cover structure 20 at intervals around the outer peripheral side of the pole, and one end of the support boss 211 is connected to the side surface of the top cover structure 20 facing the battery cell 10; the support gasket 212 is arranged on the other end of the support boss 211 and is arranged at a distance from the pole, and when the pole ear 11 and the pole are in a connected state, the pole ear 11 at the connection is located between the support gasket 212 and the pole, and the outer contour line of the projection of the support gasket 212 in its thickness direction is located outside the outer contour line of the projection of the pole in its thickness direction. In this way, by setting the support structure 21 to include a support boss 211 and a support washer 212, the support boss 211 plays an effective supporting role for the support washer 212, and the support boss 211 realizes the connection between the support washer 212 and the top cover structure 20, thereby preventing the support washer 212 from being too close to the surface of one side of the top cover structure 20 with the pole, and failing to effectively support the pole lug 11. In addition, by setting the outer contour line of the support washer 212 to a structural form located outside the outer contour line of the pole, it is ensured that the support washer 212 can provide effective support for the position of the pole lug 11 outside the weld bead structure 30 when the core is closed.

[0031] It should be noted that, in the present application, at least the width of the support pad 212 in the flattening direction of the pole ear 11 is greater than the width of the pole in the flattening direction of the pole ear 11. Figure 1 and Figure 2. Secondly, the support gasket 212 is arranged concentrically with the pole, that is, the geometric center of the support gasket 212 coincides with the geometric center of the pole, and on this basis, the outer contour line of the support gasket 212 is located outside the outer contour line of the pole, ensuring that when the pole ear 11 is bent, the support gasket 212 can open the pole ear 11 outward, thereby preventing short circuit problems caused by the length of the pole ear 11. It should be noted that in the present application, the top cover structure 20 includes a top cover sheet and a plastic layer, the plastic layer is arranged on the side of the top cover sheet facing the battery cell 10, the pole hole passes through the plastic layer and at least part of the top cover sheet, and the support boss 211 is protrudingly arranged on the surface of the plastic layer on one side facing the battery cell 10.

[0032] Optionally, the supporting boss 211 is a plastic circular boss. Of course, it can also be a boss of other shapes, as long as the material of the supporting boss 211 is plastic.

[0033] Optionally, the support gasket 212 is a plastic rectangular gasket, and of course it can also be a gasket of other shapes, and the size of the support gasket 212 can be adjusted according to different models of battery cells 10, and the shape can also be adaptively adjusted. In addition, it is also necessary to ensure that the outer contour line of the projection of the support gasket 212 in its thickness direction is located outside the outer contour line of the projection of the pole in its thickness direction, so that the support gasket 212 can provide effective support for the position of the pole lug 11 outside the weld structure 30 when the core is closed, and the bending direction of the pole lug 11 is stretched outward as much as possible.

[0034] It should be noted that the pole lug 11 and the pole are connected by welding, and a weld bead structure 30 is formed at the welding connection.

[0035] It should be noted that, in the present application, the support washer 212 is detachably connected to the support boss 211. In this way, the convenience of disassembly and assembly between the support washer 212 and the support boss 211 is ensured.

[0036] Optionally, the supporting gasket 212 is snap-fitted with the supporting boss 211 .

[0037] Optionally, the support gasket 212 is magnetically engaged with the support boss 211 .

[0038] like Figure 1 As shown, the outer contour line of the projection of the support gasket 212 in the thickness direction thereof is one of a circle, a polygon, and an ellipse.

[0039] like Figure 1As shown, the projection of the support gasket 212 in the thickness direction of the top cover structure 20 includes at least two straight line segments, and the at least two straight line segments are arranged at intervals along the paving direction of the pole lug 11. In this way, it is ensured that the edge of the support gasket 212 in contact with the pole lug 11 can change the bending direction of the pole lug 11 as much as possible, thereby stretching the pole lug 11 outward.

[0040] like Figure 1 As shown, the poles include a positive pole 22 and a negative pole 23, and the positive pole 22 and the negative pole 23 are arranged at intervals in the length direction of the top cover structure 20; there are two support structures 21, one support structure 21 is arranged on the side of the positive pole 22, and the other support structure 21 is arranged on the side of the negative pole 23. Figure 2 As shown, the thickness B1 of the support gasket 212 and the thickness B2 of the weld structure 30 for welding the pole tab 11 and the pole satisfy: B1≥B2. In this way, the support gasket 212 can provide sufficient support for the pole tab 11 while also changing the bending direction of the pole tab 11.

[0041] It should be noted that if Figure 1 As shown, the above-mentioned weld bead structure 30 is a weld mark formed after the electrode tab 11 is welded to the electrode column.

[0042] The support structure 21 provided in the present application can achieve the following beneficial effects:

[0043] 1) After the support boss 211 and the support gasket 212 are assembled, they can smooth and guide the tabs 11 on the battery cell 10, thereby preventing the tabs 11 from bending and cracking when the battery cell is assembled;

[0044] 2) The setting of the support gasket 212 effectively solves the redundancy problem of the pole ear 11 after the core is assembled, and prevents the root of the pole ear 11 from being too redundant and contacting the pole piece to cause an internal short circuit problem;

[0045] 3) The assembly of the support boss 211 and the support gasket 212 can prevent welding slag or other foreign matter of the weld structure 30 from falling onto the battery cell 10 and causing self-discharge problems.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0048] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0051] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A secondary battery structure, characterized in that: include: A battery cell (10), wherein a pole lug (11) is provided on the battery cell (10); A top cover structure (20), wherein a pole is embedded in a pole hole of the top cover structure (20), and the pole is used to connect with the pole lug (11); and a support structure (21) is also protrudingly provided on a surface of one side of the top cover structure (20) facing the battery cell (10), so that the support structure (21) provides support for the pole lug (11).

2. The secondary battery structure according to claim 1, characterized in that: The supporting structure (21) is a non-conductive structure.

3. The secondary battery structure according to claim 1, characterized in that: The support structure (21) comprises: A supporting boss (211), at least two of the supporting bosses (211), at least two of the supporting bosses (211) being arranged on the top cover structure (20) at intervals around the outer circumference of the pole, one end of the supporting boss (211) being connected to a surface of one side of the top cover structure (20) facing the battery cell (10); A support gasket (212), wherein the support gasket (212) is arranged on the other end of the support boss (211) and is arranged at a distance from the pole; when the pole ear (11) and the pole are in a connected state, the pole ear (11) at the connection is located between the support gasket (212) and the pole, and the outer contour line of the projection of the support gasket (212) in its thickness direction is located outside the outer contour line of the projection of the pole in its thickness direction.

4. The secondary battery structure according to claim 3, characterized in that: The top cover structure (20) comprises: Top cover piece; A plastic layer, the plastic layer is arranged on a side of the top cover sheet facing the battery core (10), the pole hole penetrates the plastic layer and at least a portion of the top cover sheet, and the support boss (211) is protrudingly arranged on a surface of the plastic layer facing the battery core (10).

5. The secondary battery structure according to claim 3, characterized in that: The supporting gasket (212) is detachably connected to the supporting boss (211).

6. The secondary battery structure according to claim 5, characterized in that: The supporting gasket (212) is snap-fitted with the supporting boss (211).

7. The secondary battery structure according to claim 5, characterized in that: The supporting gasket (212) is magnetically matched with the supporting boss (211).

8. The secondary battery structure according to claim 3, characterized in that: The outer contour line of the projection of the support gasket (212) in the thickness direction thereof is one of a circle, a polygon and an ellipse.

9. The secondary battery structure according to any one of claims 1 to 8, characterized in that: The pole comprises: A positive electrode column (22) and a negative electrode column (23), wherein the positive electrode column (22) and the negative electrode column (23) are arranged at intervals in the length direction of the top cover structure (20); There are two supporting structures (21).

10. The secondary battery structure according to claim 3, characterized in that: The thickness B1 of the support gasket (212) and the thickness B2 of the weld structure (30) used for welding the pole lug (11) and the pole satisfy the following relationship: B1≥B2.

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