Insulation assembly, battery cover plate and battery

Abstract

The utility model belongs to the technical field of power batteries, and discloses an insulation assembly, a battery cover plate and a battery, the insulation assembly comprises an insulation part and an elastic part, the insulation part comprises an insulation part body and plugging bulges, the plugging bulges are arranged on two sides of the insulation part body along the length direction and extend along the direction deviating from the insulation part body, and the elastic part is arranged on the insulation part body. And the elastic piece is arranged on one side, deviating from the insulating piece body, of the plugging bulge and is propped against the pole group. The elastic pieces are arranged on the plug-in protrusions on the two sides of the insulator body in the length direction, so that the elastic pieces are clamped between the pole group and the plug-in protrusions, on one hand, the pole group can be fixed through the elastic pieces in the assembling process, the pole group is prevented from moving, on the other hand, when the pole group is deformed during charging, the pole group can be fixed through the elastic pieces by extruding the elastic pieces, and the pole group is prevented from moving. Therefore, a deformation space is provided for the deformation of the pole group, and abnormal phenomena such as short circuit and the like caused by extrusion damage due to no deformation space of the pole group are avoided, so that the use safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to an insulating component, a battery cover plate and a battery. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day.

[0003] At present, the main structure of the battery includes a battery cover plate (integrating a pole column, an explosion-proof valve, an upper plastic, a lower plastic, and a liquid injection hole), a housing, a pole group end plate, a side plate, a bare battery insulating sheet, a pole group, etc. After the cover plate and the housing are welded, a closed space with a certain mechanical strength for protecting the pole group is formed; after the side plate and the bare battery insulating sheet are welded and fixed, they are wrapped outside the pole group; in addition, the bare battery insulating sheet is melt-fixed with the plastic parts of the positive and negative cover plates, so that the pole group is well fixed in the housing to avoid short-circuiting of the pole group.

[0004] When the battery is assembled, in order to prevent the pole group from moving inside when the battery shakes, the lower plastics of the positive and negative cover plates are pressed against both ends of the pole group. However, when the battery is charging, lithium ions at the positive electrode break away and then embed into the negative electrode graphite. When charging is completed, the size of the negative electrode plate becomes larger, and the length of the entire pole group also becomes longer. Since the lower plastics of the positive and negative cover plates are pressed against both ends of the pole group, the expansion space of the pole group is insufficient, resulting in the pole group being squeezed and damaged, causing abnormal phenomena such as short circuits. This not only has poor safety but also greatly reduces the service life of the battery. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an insulating component, a battery cover plate and a battery, which provide deformation allowance for the pole group, have high safety and extend the service life.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] On the one hand, an insulating component is provided, and the insulating component includes:

[0008] An insulating part, the insulating part includes an insulating part body and plugging protrusions, and the plugging protrusions are arranged on both sides of the insulating part body along the length direction and extend in a direction away from the insulating part body;

[0009] An elastic part, the elastic part is arranged on a side of the plugging protrusion away from the insulating part body and abuts against the pole group.

[0010] Optionally, one of the plugging protrusion and the elastic part is provided with a limiting protrusion, and the other of the plugging protrusion and the elastic part is provided with a limiting groove, and the limiting protrusion is inserted into the limiting groove.

[0011] Optionally, one of the limiting protrusion and the limiting groove is provided with a rotation-stopping notch, and the other of the limiting protrusion and the limiting groove is provided with a rotation-stopping protrusion, and the rotation-stopping protrusion is inserted into the rotation-stopping notch.

[0012] Optionally, the elastic member is provided with a hollow structure penetrating the elastic member.

[0013] Optionally, a plurality of the hollow structures are provided, and the plurality of the hollow structures are evenly distributed on the elastic member.

[0014] Optionally, a structural adhesive layer is provided between the elastic member and the plug-in protrusion, and the structural adhesive layer is used to bond the elastic member and the plug-in protrusion.

[0015] Optionally, the elastic member is circular, polygonal or elliptical.

[0016] Optionally, the elastic member is a sponge structure.

[0017] On the other hand, a battery cover is provided, the battery cover comprising the insulating assembly as described in any one of the above items, the battery cover further comprising a cover body, and the cover body is arranged on a side of the insulating member away from the elastic member.

[0018] On the other hand, a battery is provided, the battery comprising the battery cover as described above, the battery further comprising a battery housing and the electrode group, the battery cover is disposed on the battery housing to form a storage cavity for accommodating the electrode group.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides an insulating component, by arranging elastic parts on the plug-in protrusions on both sides of the insulating part body along the length direction, so that the elastic parts are clamped between the pole group and the plug-in protrusions. On the one hand, the pole group can be fixed by the elastic parts during assembly to prevent the pole group from moving. On the other hand, when the pole group is deformed during charging, the elastic parts can be squeezed to provide deformation space for the deformation of the pole group, so as to prevent the pole group from being squeezed and damaged due to lack of deformation space, causing abnormal phenomena such as short circuit, thereby improving the safety of use.

[0021] The utility model also provides a battery cover plate, which provides a deformation margin for the electrode group assembled subsequently after charging by applying the above-mentioned insulating component, thereby avoiding damage to the electrode group due to pressure, and has high safety.

[0022] The present utility model also provides a battery. By applying the above-mentioned battery cover plate, the internal electrode group can be fixed, preventing the electrode group from moving when the battery shakes. At the same time, a certain deformation space is provided for the charging deformation of the electrode group, thus avoiding damage to the electrode group due to pressure and improving the service life of the battery. Description of the Drawings

[0023] Figure 1 is an assembly drawing of the battery cover plate provided by the present utility model;

[0024] Figure 2 is a partial structural cross-sectional view of the insulation component provided by the present utility model;

[0025] Figure 3 is a bottom view of the insulating part in the insulation component provided by the present utility model;

[0026] Figure 4 is a top view of the elastic part in the insulation component provided by the present utility model;

[0027] Figure 5 is a partial assembly drawing of the battery cover plate and the electrode group provided by the present utility model;

[0028] Figure 6 is a partial assembly drawing of the battery provided by the present utility model.

[0029] In the figure:

[0030] 100, electrode group; 200, cover plate body; 300, battery housing;

[0031] 1, insulating part; 11, insulating part body; 12, insertion protrusion; 13, limiting groove; 14, anti-rotation protrusion;

[0032] 2, elastic part; 21, limiting protrusion; 22, anti-rotation notch; 23, hollow structure. Detailed Embodiments

[0033] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0034] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; 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 components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0036] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day.

[0038] Currently, the main structure of the battery includes a battery cover plate (integrating a terminal post, an explosion-proof valve, an upper plastic, a lower plastic, and a liquid injection hole), a housing, a pole group end plate, side plates, a bare battery insulation sheet, a pole group, etc. Among them, after the cover plate and the housing are welded, a closed space with a certain mechanical strength for protecting the pole group is formed; after the side plates and the bare battery insulation sheet are welded and fixed, they are wrapped outside the pole group; in addition, the bare battery insulation sheet is melt-fixed with the plastic parts of the positive and negative cover plates, so that the pole group is well fixed in the housing to avoid short-circuiting of the pole group.

[0039] When the battery is assembled, in order to prevent the electrode group from moving inside when the battery shakes, the lower plastic of the positive and negative electrode covers is pressed against both ends of the electrode group. However, when the battery is charging, lithium ions in the positive electrode break away and then embed into the negative electrode graphite. When charging is completed, the size of the negative electrode plate becomes larger, and the length of the entire electrode group also becomes longer. Since the lower plastic of the positive and negative electrode covers is pressed against both ends of the electrode group, there is not enough expansion space for the electrode group, resulting in the electrode group being squeezed and damaged, causing abnormal phenomena such as short circuits. This not only has poor safety but also greatly reduces the service life of the battery.

[0040] In order to fix the electrode group while providing a deformation margin for the deformation of the electrode group after charging and avoiding damage to the electrode group due to pressure and abnormal phenomena such as short circuits, this embodiment provides an insulating component.

[0041] As Figures 1 to 5 shown, the insulating component includes an insulating member 1 and an elastic member 2. The insulating member 1 includes an insulating member body 11 and insertion protrusions 12. The insertion protrusions 12 are provided on both sides of the insulating member body 11 along the length direction and extend in a direction away from the insulating member body 11. The elastic member 2 is provided on the side of the insertion protrusions 12 away from the insulating member body 11 and abuts against the electrode group 100.

[0042] By providing the elastic member 2 on the insertion protrusions 12 on both sides of the insulating member body 11 along the length direction, the elastic member 2 is clamped between the electrode group 100 and the insertion protrusions 12. On the one hand, during assembly, the elastic member 2 can be used to fix the electrode group 100 to prevent the electrode group 100 from moving. On the other hand, when the electrode group 100 deforms during charging, by squeezing the elastic member 2, a deformation space can be provided for the deformation of the electrode group 100, avoiding damage to the electrode group 100 due to lack of deformation space and causing abnormal phenomena such as short circuits, thereby improving the safety of use.

[0043] In this embodiment, a rubber pad is selected as the elastic member 2, so that the elastic member 2 has elasticity and insulation at the same time.

[0044] Optionally, as Figures 2 to 4 shown, one of the insertion protrusions 12 and the elastic member 2 is provided with a limiting protrusion 21, and the other of the insertion protrusions 12 and the elastic member 2 is provided with a limiting groove 13. The limiting protrusion 21 is inserted into the limiting groove 13. By providing a limiting protrusion 21 on one of the insertion protrusions 12 and the elastic member 2 and a limiting groove 13 on the other of the insertion protrusions 12 and the elastic member 2, when the elastic member 2 and the insertion protrusions 12 are assembled, the assembly can be positioned by inserting the limiting protrusion 21 into the limiting groove 13, ensuring the accuracy of the assembly position.

[0045] In this embodiment, the limiting groove 13 is provided on the side of the plug-in protrusion 12 away from the insulating member body 11, and the limiting protrusion 21 is provided on the side of the elastic member 2 facing the plug-in protrusion 12, and extends in a direction close to the plug-in protrusion 12. The limiting protrusion 21 is adapted to the shape of the limiting groove 13, and the limiting groove 13 can be a circular groove, a rectangular groove, an elliptical groove, etc.

[0046] Alternatively, if Figures 2 to 4 As shown, one of the limiting protrusion 21 and the limiting groove 13 is provided with a rotation-stopping notch 22, and the other of the limiting protrusion 21 and the limiting groove 13 is provided with a rotation-stopping protrusion 14, and the rotation-stopping protrusion 14 is inserted into the rotation-stopping notch 22. By providing the rotation-stopping notch 22 in one of the limiting protrusion 21 and the limiting groove 13, and providing the rotation-stopping protrusion 14 in the other of the limiting protrusion 21 and the limiting groove 13, when assembling the elastic member 2 and the plug-in protrusion 12, by inserting the rotation-stopping protrusion 14 into the rotation-stopping notch 22, relative displacement between the elastic member 2 and the plug-in protrusion 12 after assembly is avoided.

[0047] In this embodiment, a stop protrusion 14 is provided on the inner wall of the limiting groove 13, and a stop groove 22 cooperating with the stop protrusion 14 is provided on the limiting protrusion 21, wherein the stop protrusion 14 and the stop groove 22 correspond one to one, and their number can be freely set according to demand. In this embodiment, there are four stop protrusions 14 and four stop grooves 22.

[0048] Alternatively, if Figure 4 As shown, the elastic member 2 is provided with a hollow structure 23 penetrating the elastic member 2. By providing the hollow structure 23 penetrating the elastic member 2 on the elastic member 2, the integrity of the elastic member 2 is destroyed, so that when the pole group 100 deforms and squeezes the elastic member 2, the elastic member 2 is more likely to deform when subjected to force.

[0049] The shape of the hollow structure 23 can be freely set according to the requirements, and the hollow structure 23 can be a circular through hole, an elliptical long hole, a rectangular long hole, etc. In this embodiment, the hollow structure 23 is a circular through hole.

[0050] Alternatively, if Figure 4 As shown, there are multiple hollow structures 23, and the multiple hollow structures 23 are evenly distributed on the elastic member 2. By providing multiple hollow structures 23 evenly distributed on the elastic member 2, on the one hand, the degree of damage to the integrity of the elastic member 2 is enhanced by providing multiple hollow structures 23, and on the other hand, by evenly distributing the multiple hollow structures 23, the elastic member 2 can ensure uniform deformation at various locations when subjected to force.

[0051] Optionally, a structural adhesive layer is provided between the elastic member 2 and the plug-in protrusion 12, and the structural adhesive layer is used to bond the elastic member 2 and the plug-in protrusion 12. By providing the structural adhesive layer between the elastic member 2 and the plug-in protrusion 12, the elastic member 2 is bonded to the plug-in protrusion 12, thereby preventing the free elastic member 2 from slipping with the plug-in protrusion 12.

[0052] Optionally, the elastic member 2 is circular, polygonal or elliptical. By making the elastic member 2 circular, polygonal or elliptical, the elastic member 2 can be adapted to the plug-in protrusions 12 of different shapes.

[0053] Optionally, the elastic member 2 is a sponge structure. By adopting the elastic member 2 with a sponge structure, the elastic member 2 has good compressibility, thereby providing sufficient deformation margin for the deformation of the pole group 100 .

[0054] In this embodiment, if Figure 1 As shown, a battery cover is also provided, the battery cover includes the above-mentioned insulation component, and the battery cover also includes a cover body 200, and the cover body 200 is arranged on the side of the insulation member 1 away from the elastic member 2. By applying the above-mentioned insulation component, the battery cover provides a deformation margin for the electrode group 100 assembled subsequently after charging, thereby preventing the electrode group 100 from being damaged due to pressure, and has higher safety.

[0055] In this embodiment, if Figure 5 , Figure 6 As shown, a battery is also provided, the battery includes the battery cover, the battery also includes a battery housing 300 and an electrode group 100, the battery cover is provided on the battery housing 300 to form a storage cavity for accommodating the electrode group 100. By using the battery cover, the battery can fix the internal electrode group 100 to prevent the electrode group 100 from moving when the battery shakes, and provide a certain deformation space for the electrode group 100 to deform during charging, thereby preventing the electrode group 100 from being damaged due to pressure, thereby improving the service life of the battery.

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Insulating component, characterized in that, The insulating assembly includes: An insulating member, which includes an insulating member body and insertion protrusions. The insertion protrusions are provided on both sides of the insulating member body along the length direction and extend in a direction away from the insulating member body; An elastic member, which is provided on the side of the insertion protrusion away from the insulating member body and abuts against the electrode group.

2. The insulating component according to claim 1, characterized in that, One of the insertion protrusion and the elastic member is provided with a limiting protrusion, and the other of the insertion protrusion and the elastic member is provided with a limiting groove, and the limiting protrusion is inserted into the limiting groove.

3. The insulating component according to claim 2, characterized in that, One of the limiting protrusion and the limiting groove is provided with a rotation-stopping notch, and the other of the limiting protrusion and the limiting groove is provided with a rotation-stopping protrusion, and the rotation-stopping protrusion is inserted into the rotation-stopping notch.

4. The insulating component according to claim 1, characterized in that, The elastic member is provided with a hollow structure penetrating through the elastic member.

5. The insulating component according to claim 4, characterized in that There are a plurality of the hollow structures, and the plurality of the hollow structures are evenly distributed on the elastic member.

6. The insulating component according to claim 1, characterized in that, A structural adhesive layer is provided between the elastic member and the insertion protrusion, and the structural adhesive layer is used for bonding the elastic member and the insertion protrusion.

7. The insulating component according to claim 1, characterized in that The elastic member is circular or polygonal or elliptical.

8. The insulating component according to claim 1, characterized in that The elastic member is a sponge structure.

9. Battery cover plate, characterized in that, The battery cover plate includes the insulating assembly according to any one of claims 1-8. The battery cover plate further includes a cover plate body, and the cover plate body is provided on the side of the insulating member away from the elastic member.

10. A battery, characterized in that, The battery includes the battery cover plate according to claim 9. The battery further includes a battery housing and the electrode group. The battery cover plate is covered on the battery housing to form a storage cavity for accommodating the electrode group.

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