A cover plate assembly and a battery

Abstract

The utility model belongs to battery technical field discloses a kind of cover plate assembly and battery, a kind of cover plate assembly is connected with electric core, cover plate assembly includes cover plate body, explosion-proof valve body and two groups of reinforcing ribs, cover plate body is opened with explosion-proof valve hole in the position corresponding explosion-proof valve body;Two groups of reinforcing ribs are symmetrically set in the two sides of explosion-proof valve hole in the width direction of cover plate body, reinforcing rib is spaced apart from explosion-proof valve hole, the length direction of explosion-proof valve hole is perpendicular to the length direction of reinforcing rib, along the length direction of cover plate body, the both ends of reinforcing rib are all set out of the edge of explosion-proof valve hole. Thus, reinforcing rib is set out of explosion-proof valve hole, can improve the structural strength and deformation resistance of cover plate body corresponding explosion-proof valve hole area, reduce welding stress concentration, avoid deformation or size change of cover plate body in welding process, improve the size stability and welding effect of cover plate body.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate assembly and a battery. Background Technology

[0002] A power battery is a rechargeable battery that provides core power for new energy vehicles, energy storage systems, etc. It can store electrical energy and release it when needed to power key equipment such as drive motors and electronic control systems.

[0003] A battery consists of a cover, cells, and a casing. The cover and casing can enclose a sealed space to house the cells. The cover is usually equipped with an explosion-proof valve to allow for rapid depressurization in the event of thermal runaway and the generation of a large amount of gas inside the battery.

[0004] The explosion-proof valve achieves a sealed connection with the cover plate through welding. However, the cover plate is easily affected by welding stress and warps. Furthermore, the temperature drops after welding, causing the cover plate to become smaller, which leads to a larger gap between the cover plate and the shell and affects the welding effect. Utility Model Content

[0005] The purpose of this utility model is to provide a cover plate assembly and a battery to solve the problem that the cover plate is prone to deformation and size change during the welding of explosion-proof valves.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, a cover plate assembly connected to a battery cell is provided. The cover plate assembly includes: a cover plate body and an explosion-proof valve body. An explosion-proof valve hole is provided on the cover plate body at a position corresponding to the explosion-proof valve body. Two sets of reinforcing ribs are symmetrically arranged on both sides of the explosion-proof valve hole in the width direction of the cover plate body. The reinforcing ribs are spaced apart from the explosion-proof valve hole. The length direction of the explosion-proof valve hole is perpendicular to the length direction of the reinforcing rib. Along the length direction of the cover plate body, both ends of the reinforcing rib protrude beyond the edge of the explosion-proof valve hole.

[0008] Preferably, the length direction of the explosion-proof valve hole is parallel to the width direction of the cover plate body, and the length direction of the reinforcing rib is parallel to the length direction of the cover plate body.

[0009] Preferably, the axis of symmetry of the explosion-proof valve hole coincides with the axis of symmetry of the reinforcing rib along the width direction of the cover plate body.

[0010] Preferably, along the length of the cover plate body, the length of the end of the reinforcing rib protruding from the edge on the same side as the explosion-proof valve hole is not less than 5mm.

[0011] Preferably, the height of the reinforcing rib is in the range of 0.15mm-0.5mm; and / or, the width of the reinforcing rib is in the range of 2mm-5mm.

[0012] Preferably, the reinforcing ribs are smoothly transitioned into the cover plate body.

[0013] Preferably, the cover plate body and the reinforcing rib are integrally stamped.

[0014] Preferably, the reinforcing rib protrudes to the side away from the battery cell, or the reinforcing rib protrudes to the side facing the battery cell.

[0015] Preferably, the cover plate body is further provided with an assembly step, which is located on the side of the cover plate body facing the battery cell, so that the explosion-proof valve body overlaps with the assembly step.

[0016] In a second aspect, a battery includes a cell, a housing, and a cover assembly as described above, wherein the housing and the cover body enclose a space for accommodating the cell.

[0017] The beneficial effects of this utility model are:

[0018] A cover plate assembly connected to a battery cell includes a cover plate body, an explosion-proof valve body, and two sets of reinforcing ribs. An explosion-proof valve hole is provided on the cover plate body at a position corresponding to the explosion-proof valve body. The two sets of reinforcing ribs are symmetrically arranged on both sides of the explosion-proof valve hole in the width direction of the cover plate body. The reinforcing ribs are spaced apart from the explosion-proof valve hole. The length direction of the explosion-proof valve hole is perpendicular to the length direction of the reinforcing rib. Along the length direction of the cover plate body, both ends of the reinforcing ribs protrude beyond the edge of the explosion-proof valve hole.

[0019] Thus, by setting reinforcing ribs protruding from the edge of the explosion-proof valve hole on both sides, the structural strength and deformation resistance of the cover plate body corresponding to the explosion-proof valve hole area can be improved, the welding stress generated during the welding of the explosion-proof valve body can be dispersed and offset, the cover plate body can be prevented from deforming or changing in size, the dimensional stability and welding effect of the cover plate body before and after welding can be improved, and the welding stability of the cover plate body and the shell can be improved. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the first structure of the cover plate assembly in one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the second structure of the cover plate assembly in one embodiment of the present invention.

[0022] In the picture:

[0023] 1. Cover plate body; 11. Explosion-proof valve hole; 12. Assembly step; 13. Pole post hole; 2. Reinforcing rib. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0028] See Figure 1 and Figure 2This utility model provides a cover plate assembly that is connected to a battery cell. The cover plate assembly includes a cover plate body 1, an explosion-proof valve body (not shown in the figure), and two sets of reinforcing ribs 2. An explosion-proof valve hole 11 is provided on the cover plate body 1 at a position corresponding to the explosion-proof valve body. The two sets of reinforcing ribs 2 are symmetrically arranged on both sides of the explosion-proof valve hole 11 in the width direction of the cover plate body 1. The reinforcing ribs 2 are spaced apart from the explosion-proof valve hole 11. The length direction of the explosion-proof valve hole 11 is perpendicular to the length direction of the reinforcing rib 2. Along the length direction of the cover plate body 1, both ends of the reinforcing rib 2 protrude from the edge of the explosion-proof valve hole 11.

[0029] In this embodiment, the cover plate body 1 is made of aluminum material, and the explosion-proof valve body is a waist-shaped thin sheet structure. The explosion-proof valve body is fixedly and sealed to the cover plate body 1 by welding. The cover plate body 1 is also provided with pole hole 13 for installing pole (not shown in the figure). There are two pole holes 13. The explosion-proof valve hole 11 is located between the two pole holes 13. One pole hole 13, the explosion-proof valve hole 11, and the other pole hole 13 are arranged alternately along the length direction of the cover plate body 1.

[0030] Thus, the reinforcing rib 2 protruding from the explosion-proof valve can improve the structural strength and deformation resistance of the area of ​​the cover plate body 1 corresponding to the explosion-proof valve hole 11, so as to disperse and offset the effect of the welding stress generated during the welding of the explosion-proof valve body on the cover plate body 1, avoid the cover plate body 1 from deforming or changing in size during the welding process, improve the dimensional stability of the cover plate body 1 before and after welding, and thus improve the welding effect.

[0031] It is understandable that the material of the cover plate body 1 can be adjusted according to actual needs, which will not be elaborated here; the shape of the explosion-proof valve body can be rectangular, oval, etc., which will not be listed in detail here.

[0032] See Figure 1 In some embodiments, the length direction of the explosion-proof valve hole 11 is parallel to the width direction of the cover plate body 1, and the length direction of the reinforcing rib 2 is parallel to the length direction of the cover plate body 1.

[0033] In this embodiment, each set of reinforcing ribs 2 includes one reinforcing rib 2, that is, one reinforcing rib 2 is provided on each side of the explosion-proof valve hole 11, and the length direction of the two reinforcing ribs 2 is parallel to the length direction of the cover plate body 1.

[0034] Thus, the reinforcing rib 2 can form a rigid support for the area surrounding the explosion-proof valve hole 11 along the length direction of the cover plate body 1, directionally disperse welding stress, improve the structural strength and deformation resistance of the cover plate body 1, and make the cover plate body 1 more stable in shape during the welding process.

[0035] It is understandable that the length directions of the two reinforcing ribs 2 may not be parallel. In this embodiment, the two reinforcing ribs 2 are parallel in order to make the structural strength of each area of ​​the cover plate body 1 more uniform. A set of reinforcing ribs 2 may also be provided with two or more reinforcing ribs 2. The number and setting position of the reinforcing ribs 2 can be adjusted according to the size of the cover plate body 1, which will not be listed in detail here.

[0036] See Figure 1 In some embodiments, the axis of symmetry of the explosion-proof valve hole 11 coincides with the axis of symmetry of the reinforcing rib 2 along the width direction of the cover plate body 1. That is, the two reinforcing ribs 2 are symmetrically arranged along the axis of symmetry of the explosion-proof valve hole 11 in the length direction of the cover plate body 1 and the axis of symmetry in the width direction of the cover plate body 1.

[0037] In this way, the two reinforcing ribs 2 can form a symmetrical rigid support structure in the area around the explosion-proof valve hole 11, so that the welding stress generated in the process of welding the explosion-proof valve body to the cover plate body 1 along the width and length directions of the cover plate body 1 can be evenly distributed to the reinforcing ribs 2 located on both sides of the explosion-proof valve body, further improving the deformation resistance of the cover plate body 1.

[0038] See Figure 1 In some embodiments, along the length of the cover plate body 1, the length of the end of the reinforcing rib 2 protruding from the same side edge of the explosion-proof valve hole 11 is not less than 5mm. For example, the length of the end of the reinforcing rib 2 protruding from the same side edge of the explosion-proof valve hole 11 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0039] In this embodiment, the two pole holes 13 are respectively disposed on both sides of the two sets of reinforcing ribs 2 in the length direction, that is, the reinforcing ribs 2 do not extend to the position of the pole holes 13.

[0040] In this way, the welding stress generated during the welding of the explosion-proof valve body can be evenly distributed and transmitted along the reinforcing rib 2 to the outside of the explosion-proof valve hole 11, avoiding stress concentration around the explosion-proof valve hole 11. The pole hole 13 is set on both sides of the reinforcing rib 2, which can prevent stress from being transmitted to the area around the pole hole 13, prevent the pole hole 13 from deforming, improve the stability of the cover plate body 1 during the welding process, and improve the welding effect.

[0041] It is understandable that the length of the end of the reinforcing rib 2 protruding from the same side edge of the explosion-proof valve hole 11 can be adjusted according to the size of the cover plate body 1, which will not be listed in detail here.

[0042] See Figure 1 In some embodiments, the height of the reinforcing rib 2 ranges from 0.15mm to 0.5mm, and the width of the reinforcing rib 2 ranges from 2mm to 5mm.

[0043] In this embodiment, the height of the reinforcing rib 2 can be any value between 0.15mm and 0.5mm or any two values, such as 0.15mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc., and the width of the reinforcing rib 2 can be any value between 2mm and 5mm or any two values, such as 2mm, 3mm, 4mm, 5mm, etc.

[0044] In this way, the reinforcing rib 2 can have sufficient structural strength, thereby increasing the structural strength of the cover plate body 1, dispersing welding stress, preventing the cover plate body 1 from deforming during the welding of the explosion-proof valve body and shrinking in size due to the influence of welding temperature, and effectively utilizing the space on the cover plate body 1, making the overall structure of the cover plate assembly more compact.

[0045] Understandably, the height of the reinforcing rib 2 cannot be too small, as this would affect its ability to disperse welding stress. The height of the reinforcing rib 2 also cannot be too large, as this would result in it occupying too much space in the thickness direction of the cover plate body 1. The width of the reinforcing rib 2 cannot be too small, as this would make it difficult to fully absorb welding stress. The width of the reinforcing rib 2 also cannot be too large, as this would result in it occupying too much space on the cover plate body 1.

[0046] See Figure 1 In some embodiments, the reinforcing rib 2 is smoothly transitioned to the cover plate body 1. Further, in some embodiments, the cover plate body 1 and the reinforcing rib 2 are integrally stamped.

[0047] In this embodiment, the two ends of the reinforcing rib 2 are rounded, and the longitudinal section of the reinforcing rib 2 is semi-circular.

[0048] Thus, the reinforcing rib 2 is formed on the cover plate body 1 by stamping, so that the mechanical properties of the reinforcing rib 2 and the cover plate body 1 are consistent. When the temperature changes, the shrinkage or expansion trend of the two is synchronized, avoiding additional deformation due to differences in materials or connection methods, improving the structural strength at the connection between the reinforcing rib 2 and the cover plate body 1, and allowing the welding stress to be evenly transmitted to the cover plate body 1 through the reinforcing rib 2. The smooth transition between the reinforcing rib 2 and the cover plate body 1 can reduce stress concentration at the connection between the reinforcing rib 2 and the cover plate body 1, improve the dimensional stability of the cover plate body 1, and prevent deformation or cracking of the cover plate body 1 at the location where the reinforcing rib 2 is set due to stress concentration, thereby improving the structural strength and welding effect of the cover plate body 1.

[0049] See Figure 1 In some embodiments, the reinforcing rib 2 is provided to protrude to the side away from the battery cell, or the reinforcing rib 2 is provided to protrude to the side facing the battery cell.

[0050] In this embodiment, the protrusion direction of the reinforcing rib 2 is parallel to the thickness direction of the cover plate body 1, and the two reinforcing ribs 2 are the same size, and both reinforcing ribs 2 are protruding towards the side facing the battery cell.

[0051] In this way, the space in the thickness direction of the cover plate body 1 can be fully utilized, so that the supporting force of the reinforcing rib 2 on the cover plate body 1 is evenly distributed along the thickness direction, avoiding the impact of the supporting effect due to the tilt of the protrusion direction, improving the structural strength of the cover plate body 1 in the thickness direction, and dispersing the welding stress evenly to both sides, thereby improving the stability of the cover plate body 1.

[0052] It is understandable that the protrusion direction of the reinforcing rib 2 can be adjusted according to the actual design needs, as long as it can evenly transmit and disperse the welding stress. The protrusion directions of the two reinforcing ribs 2 can be the same or opposite. The protrusion directions of the two reinforcing ribs 2 can be flexibly adapted according to the internal space of the battery, as long as it can avoid interference with other structures. No further examples will be listed here.

[0053] See Figure 2 In some embodiments, the cover plate body 1 is further provided with an assembly step 12, which is located on the side of the cover plate body 1 facing the battery cell, so that the explosion-proof valve body overlaps with the assembly step 12.

[0054] In this embodiment, the shape of the assembly step 12 is adapted to the shape of the explosion-proof valve hole 11. When the explosion-proof valve body overlaps with the assembly step 12, the side wall of the explosion-proof valve body fits against the inner wall of the explosion-proof valve hole 11 to facilitate welding of the outer edge of the explosion-proof valve body.

[0055] Thus, the assembly step 12 can provide stable support for the explosion-proof valve body and limit the relative position of the explosion-proof valve body in the explosion-proof valve hole 11, improve the stability of the explosion-proof valve body assembled to the cover plate body 1 and the welding effect, so that the stress generated by welding can be transmitted to the assembly step 12, avoid the welding stress directly acting on the surface of the cover plate body 1 and causing local deformation or warping, and improve the overall structural stability of the cover plate assembly.

[0056] See Figure 1 This utility model also provides a battery, including a battery cell, a casing, and a cover plate assembly, wherein the casing and the cover plate body 1 enclose a space for accommodating the battery cell. In this embodiment, the casing and the cover plate body 1 are sealed together by welding.

[0057] Thus, by setting reinforcing ribs 2 to disperse the stress generated during the welding process, the deformation and dimensional changes of the cover plate body 1 can be reduced, the fitting gap between the cover plate body 1 and the shell can be narrowed, and the cover plate body 1 and the shell can be welded stably, thereby improving the safety and stability of the battery.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cover plate assembly, characterized in that, The cover plate assembly, connected to the battery cell, includes: The cover plate body (1) and the explosion-proof valve body are provided with an explosion-proof valve hole (11) on the cover plate body (1) corresponding to the position of the explosion-proof valve body; Two sets of reinforcing ribs (2) are symmetrically arranged on both sides of the explosion-proof valve hole (11) in the width direction of the cover plate body (1). The reinforcing ribs (2) are spaced apart from the explosion-proof valve hole (11). The length direction of the explosion-proof valve hole (11) is perpendicular to the length direction of the reinforcing rib (2). Along the length direction of the cover plate body (1), both ends of the reinforcing rib (2) protrude from the edge of the explosion-proof valve hole (11).

2. The cover plate assembly according to claim 1, characterized in that, The length direction of the explosion-proof valve hole (11) is parallel to the width direction of the cover plate body (1), and the length direction of the reinforcing rib (2) is parallel to the length direction of the cover plate body (1).

3. The cover plate assembly according to claim 1, characterized in that, Along the width direction of the cover plate body (1), the axis of symmetry of the explosion-proof valve hole (11) coincides with the axis of symmetry of the reinforcing rib (2).

4. The cover plate assembly according to claim 1, characterized in that, Along the length of the cover plate body (1), the length of the end of the reinforcing rib (2) protruding from the same side edge of the explosion-proof valve hole (11) is not less than 5mm.

5. The cover plate assembly according to claim 1, characterized in that, The height of the reinforcing rib (2) is in the range of 0.15mm-0.5mm; and / or the width of the reinforcing rib (2) is in the range of 2mm-5mm.

6. The cover plate assembly according to claim 1, characterized in that, The reinforcing rib (2) is smoothly transitioned to the cover plate body (1).

7. The cover plate assembly according to claim 1, characterized in that, The cover plate body (1) and the reinforcing rib (2) are integrally stamped and formed.

8. The cover plate assembly according to claim 7, characterized in that, The reinforcing rib (2) is provided to protrude from the side away from the battery cell, or the reinforcing rib (2) is provided to protrude from the side towards the battery cell.

9. The cover plate assembly according to any one of claims 1-8, characterized in that, The cover plate body (1) is also provided with an assembly step (12), which is located on the side of the cover plate body (1) facing the battery cell, so that the explosion-proof valve body overlaps with the assembly step (12).

10. A battery, characterized in that, It includes a battery cell, a housing, and a cover plate assembly as described in any one of claims 1-9, wherein the housing and the cover plate body (1) enclose a space for accommodating the battery cell.

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