Buffer structure and battery

Abstract

The utility model relates to the technical field of lithium battery manufacturing, and discloses a buffer structure and a battery, and the buffer structure comprises an elastic end plate of which the two ends can be extruded by fixing pieces; rebound grooves are formed in the end faces of the two ends of the elastic end plate correspondingly, each rebound groove penetrates through the two side edges of the elastic end plate, and the heights of the rebound grooves are gradually increased from inside to outside. In a normal state, the two ends of the elastic end plate naturally stretch. When the pre-tightening force applying device is installed, the fixing pieces extrude the two ends of the elastic end plate, and at the moment, the edges of the two ends of the elastic end plate are both shrunk and folded; after the pre-tightening force applying equipment completes work, the extrusion effect of the fixing piece on the two ends of the elastic end plate disappears, and the edges of the two ends of the elastic end plate stretch and rebound. Therefore, on the basis of the original end plate, the elastic end plate is provided with the springback grooves at the edges of the two ends, so that the purposes of elastic contraction and automatic resetting can be achieved, and the effect of pretightening force on the battery can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery manufacturing, and particularly relates to a buffer structure and a battery. Background Art

[0002] As the core component of today's new energy vehicles, lithium-ion power batteries have a performance that directly determines the key to the development of new energy vehicles. Currently, the market and application of lithium-ion batteries have shown explosive growth.

[0003] The use of lithium-ion batteries inevitably involves numerous charge and discharge cycles. During charging, lithium ions are released from the positive electrode and embedded in the graphite of the negative electrode, causing the negative electrode to expand. During discharge, lithium ions are released from the negative electrode and embedded in the layered positive electrode material, causing it to expand. Furthermore, as the battery ages, the electrolyte gasses, causing the thickness of the battery to expand. This not only affects the battery's service life and cycle life, but also significantly impacts the module's cell capacity and dimensional design. Experiments have shown that applying a certain preload to lithium batteries significantly improves their performance and cycle life.

[0004] Among them, in the process of pre-tightening the battery module, after the plastic end plate is assembled on the battery module, the pre-tightening device can be installed. At this time, the plastic end plate and the outer side of the battery module are wrapped with fixings, wherein the fixings can be plastic-steel belts. At the same time, the pre-tightening equipment occupies part of the space of the fixings. When the pre-tightening equipment is completed, the pre-tightening equipment needs to be removed. At this time, the fixings will become loose due to the existence of empty space, thus losing the function of pre-tightening the battery. Utility Model Content

[0005] In order to solve the deficiencies of the prior art, the present invention provides a buffer structure and a battery.

[0006] The technical effects to be achieved by the present invention are achieved through the following technical aspects:

[0007] In a first aspect, the present invention provides a buffer structure, comprising: elastic end plates whose ends can be squeezed by fixing members;

[0008] Rebound grooves are respectively provided on both end surfaces of the elastic end plate. Each of the rebound grooves runs through both sides of the elastic end plate, and the height of the rebound grooves increases gradually from the inside to the outside.

[0009] In some embodiments, the ratio of the height of the outermost end of the rebound groove to the height of the elastic end plate is in a range of 1:2 to 2:5.

[0010] In some embodiments, the ratio of the depth of the rebound groove to the length of the elastic end plate is in a range of 1:4 to 1:5.

[0011] In some embodiments, the cross-sectional shape of the rebound groove is set to be a right triangle, and a side wall of the rebound groove is set to be a right-angled side.

[0012] In some embodiments, the angle between the two side walls of the rebound groove is set to 30°.

[0013] In some embodiments, the side wall of the rebound groove away from the fixing member is configured as a right-angled side.

[0014] In some embodiments, the elastic end plate is made of polyhexamethylene adipamide or a mixture thereof, wherein the mixture comprises polycarbonate and acrylonitrile-butadiene-styrene copolymer.

[0015] In some embodiments, a reinforcing rib is provided on one surface of the elastic end plate.

[0016] In some embodiments, the elastic end plate is provided with a limiting groove for preventing the fixing member from shifting.

[0017] In a second aspect, the present invention provides a battery comprising the buffer structure described in any one of the above embodiments.

[0018] In summary, the present invention has at least the following advantages:

[0019] The buffer structure provided by the present invention has the following characteristics: under normal conditions, the two ends of the elastic end plate naturally stretch, and the shape of the rebound groove is fixed. When the pre-tightening device is installed, the fixing part can tightly bind the battery module and the elastic end plate, and because the pre-tightening device occupies a part of the space of the fixing part, the fixing part squeezes the two ends of the elastic end plate. At this time, the two rebound grooves on the elastic end plate are deformed, and the two side walls of the rebound groove are squeezed, that is, the two end edges of the elastic end plate are both contracted and closed; when the pre-tightening device completes its work and is removed, there will be empty space in the fixing part. At this time, the squeezing effect of the fixing part on the two ends of the elastic end plate disappears, the rebound groove returns to its original state, and the two end edges of the elastic end plate stretch and rebound, that is, the space occupied by the pre-tightening device is just occupied by the end plate edge that automatically resets. In this way, it can be seen that the elastic end plate is provided with rebound grooves on the edges of both ends on the basis of the original end plate, which can achieve the purpose of elastic contraction and automatic reset, thereby providing pre-tightening effect to the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a buffer structure in one direction according to an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the overall structure of the buffer structure in another direction of an embodiment of the present utility model;

[0022] Figure 3 for Figure 2 Enlarged schematic diagram of part A.

[0023] Markings in the figure:

[0024] 10. Buffer structure; 100. Elastic end plate; 110. Rebound groove; 111. Limiting groove; 120. Reinforcement rib. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] refer to Figures 1 to 2 The coordinate system is such that the direction indicated by the arrow of the X-axis is right, the direction indicated by the arrow of the Y-axis is forward, and the direction indicated by the arrow of the Z-axis is upward.

[0028] Example 1:

[0029] like Figures 1 to 3 As shown, this embodiment provides a buffer structure, an elastic end plate 100 whose two ends can be squeezed by the fixing parts; rebound grooves 110 are respectively opened on the end surfaces of both ends of the elastic end plate 100, and each rebound groove 110 is set through the two sides of the elastic end plate 100, and the height of the rebound groove 110 is gradually increased from the inside to the outside.

[0030] Specifically, the elastic end plate 100 is made of elastic material, and a rebound groove 110 is opened on the end surface of the left and right ends of the elastic end plate 100, and each rebound groove 110 is set through the front and back sides of the elastic end plate 100. Figure 1 The dashed line shown is the midline. The height of the two rebound grooves 110 increases gradually from the inside to the outside, that is, the inner side of each rebound groove 110 is lower than the outer side. The fixing member contacts one side and both ends of the elastic end plate 100, that is, the fixing member tightly fastens the elastic end plate 100 to the battery module along the X-axis to secure the elastic end plate 100 to the battery module.

[0031] It is worth noting that under normal conditions, the two ends of the elastic end plate 100 stretch naturally, and the shape of the rebound groove 110 is fixed. When installing the pre-tightening device, the fixing part can tightly bind the battery module and the elastic end plate 100, and because the pre-tightening device occupies a part of the space of the fixing part, the fixing part squeezes the two ends of the elastic end plate 100. At this time, the two rebound grooves 110 on the elastic end plate 100 are deformed, and the two side walls of the rebound groove 110 are squeezed, that is, the two end edges of the elastic end plate 100 are shrunk and closed; when the pre-tightening device completes its work and is removed, there will be empty space in the fixing part. At this time, the squeezing effect of the fixing part on the two ends of the elastic end plate 100 disappears, the rebound groove 110 returns to its original state, and the two end edges of the elastic end plate 100 stretch and rebound, that is, the space occupied by the pre-tightening device is just occupied by the end plate edge that automatically resets. Thus, it can be seen that the elastic end plate 100 is provided with rebound grooves 110 at both ends of the edge on the basis of the original end plate, which can achieve the purpose of elastic contraction and automatic reset, thereby providing pre-tightening force to the battery.

[0032] Example 2

[0033] This embodiment is a further implementation of embodiment 1. Figure 1 As shown, in this embodiment, the ratio of the height of the outermost end of the rebound groove 110 to the height of the elastic end plate 100 ranges from 1:2 to 2:5.

[0034] Specifically, the height direction of the outermost end of the rebound groove 110 and the height direction of the elastic end plate 100 are both arranged along the Z-axis. The ratio of the groove height at the outermost end of the rebound groove 110 to the thickness of the elastic end plate 100 is based on actual production requirements and is not limited here. It only needs to ensure the rebound effect of the upper and lower side walls of the rebound groove 110. For example, the ratio of the height of the outermost end of the rebound groove 110 to the height of the elastic end plate 100 is 1:2; for another example, the ratio of the height of the outermost end of the rebound groove 110 to the height of the elastic end plate 100 is 1:2.2; and for another example, the ratio of the height of the outermost end of the rebound groove 110 to the height of the elastic end plate 100 is 2:5.

[0035] In order to ensure the use of the elastic end plate 100 while ensuring the buffering effect, as shown in FIG. Figure 1 As shown, in some embodiments, the ratio of the depth of the rebound groove 110 to the length of the elastic end plate 100 ranges from 1:4 to 1:5.

[0036] Specifically, the depth direction of the rebound groove 110 and the length direction of the elastic end plate 100 are both arranged along the X-axis. The ratio of the depth of the rebound groove 110 to the length of the elastic end plate 100 is set according to actual production requirements and is not limited here. It only needs to ensure the rebound effect of the upper and lower side walls of the rebound groove 110. For example, the ratio of the depth of the rebound groove 110 to the length of the elastic end plate 100 is 1:4; for another example, the ratio of the depth of the rebound groove 110 to the length of the elastic end plate 100 is 1:4.5. For another example, the ratio of the depth of the rebound groove 110 to the length of the elastic end plate 100 is 1:5.

[0037] In order to extend the service life of the elastic end plate 100, as Figures 1 to 3 As shown, in some embodiments, the cross-sectional shape of the rebound groove 110 is set to be a right triangle, and a side wall of the rebound groove 110 is set to be a right-angled side.

[0038] Specifically, the rebound groove 110 is triangular in shape, which improves the rebound effect. The two side walls can rebound while avoiding easy breakage. The cross-sectional shape of the rebound groove 110 is set according to actual production requirements and is not limited here. It only needs to ensure the rebound effect of the upper and lower side walls of the rebound groove 110.

[0039] In order to make the rebound effect better, Figure 1 As shown, in some embodiments, the angle between the two side walls of the rebound groove 110 is set to 30°.

[0040] Specifically, when the angle formed between the upper and lower side walls of the rebound groove 110 is 30°, and one of the side walls is a right-angled side, the rebound effect is better.

[0041] In order to extend the service life of the elastic end plate 100, as Figures 1 to 3 As shown, in some embodiments, the side wall of the rebound groove 110 away from the fixing member is configured as a right-angled side.

[0042] Specifically, when in use, the upper surface of the elastic end plate 100 contacts the battery module, the lower surface of the elastic end plate 100 contacts the fixing part, and the upper side wall is set as a right-angle side, that is, the side wall of the rebound groove 110 away from the fixing part is set as a right-angle side. In this way, the rebound effect of the side wall of the rebound groove 110 can be optimized while avoiding the breakage of the side wall of the rebound groove 110.

[0043] To facilitate the preparation of the elastic end plate 100 , in some embodiments, the material of the elastic end plate 100 is set to polyhexamethylene adipamide or a mixture, wherein the mixture includes polycarbonate and acrylonitrile-butadiene-styrene copolymer.

[0044] Specifically, by carefully selecting the material of the elastic end plate 100, the strength of the elastic end plate 100 can be ensured while also ensuring the resilience of the ends of the elastic end plate 100. For example, the elastic end plate 100 can be made of polyhexamethylene adipamide; or, for another example, the elastic end plate 100 can be made of a mixture of polycarbonate and acrylonitrile-butadiene-styrene copolymer. It is understood that the material of the elastic end plate 100 can also be other materials, which are not limited here, as long as the elastic end plate 100 has a certain strength and resilience.

[0045] In order to facilitate the production of the elastic end plate 100 , in some embodiments, the elastic end plate 100 is integrally formed.

[0046] Specifically, the elastic end plate 100 is integrally formed by injection molding, which is simpler to produce and has lower costs.

[0047] In order to facilitate the use of the elastic end plate 100, as Figure 2 and Figure 3 As shown, in some embodiments, a reinforcing rib 120 is provided on one surface of the elastic end plate 100 .

[0048] Specifically, the reinforcing ribs 120 are arranged as a plurality of transverse and longitudinal ribs in an array to form a plurality of rectangular frames arranged in an array. The provision of the reinforcing ribs 120 on the bottom surface strengthens the elastic end plate 100. Furthermore, the reinforcing ribs 120 are integrally formed with the elastic end plate 100, further enhancing the strength of the elastic end plate 100.

[0049] In order to facilitate the installation of the elastic end plate 100 and the fixing member, as shown in FIG. Figures 1 to 3 As shown, in some embodiments, a limiting groove 111 is provided on the elastic end plate 100 for preventing the fixing member from shifting.

[0050] Specifically, limiting grooves 111 are provided on both end surfaces of the elastic end plate 100. The limiting grooves 111 are located on the outermost sidewalls of the rebound groove 110 and extend through the upper and lower ends of the rebound groove 110. The number of limiting grooves 111 on the sidewalls of each rebound groove 110 matches the number of contacting fixing elements. This prevents displacement of the fixing elements, facilitates the coordinated use of the elastic end plate 100 and the fixing elements, and effectively increases the practicality of the elastic end plate 100.

[0051] In order to ensure a better use effect of the elastic end plate 100, as Figures 1 to 3 As shown, in some embodiments, the peripheral end surface of the elastic end plate 100 is provided with a chamfer.

[0052] Specifically, chamfers are provided at both left and right ends and front and back sides of the elastic end plate 100 to prevent hands from being cut by sharp edges, thereby facilitating the use of the elastic end plate 100 .

[0053] Example 3

[0054] This embodiment provides a battery module, including the buffer structure 10 of embodiment 1 or 2.

[0055] Specifically, an ear is formed at the upper and lower side walls of the rebound groove 110. When the pre-tightening device is engaged, the ears on both sides of the elastic end plate 100 will shrink. After the pre-tightening device is engaged and the device is removed, the ears on both sides of the elastic end plate 100 will automatically reset. At this time, the space occupied by the pre-tightening device is just occupied by the automatically reset ears, thereby achieving the battery pre-tightening effect.

[0056] In the above embodiment, the fixing member may be selected from but not limited to a plastic-steel strip, and only needs to fasten the elastic end plate 100 and other components to the battery module.

[0057] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0058] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0059] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0060] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0061] Although the present invention has been described with reference to the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and variations based on the above content. Therefore, all such substitutions, modifications and variations are included within the spirit and scope of the appended claims.

Claims

1. A buffer structure, characterized in that: include: Elastic end plates (100) with both ends capable of being squeezed by fixing members; Rebound grooves (110) are respectively provided on the end surfaces of both ends of the elastic end plate (100). Each of the rebound grooves (110) is arranged to pass through both sides of the elastic end plate (100), and the height of the rebound grooves (110) is gradually increased from the inside to the outside.

2. The buffer structure according to claim 1, characterized in that: The ratio of the height of the outermost end of the rebound groove (110) to the height of the elastic end plate (100) is in the range of 1:2 to 2:

5.

3. The buffer structure according to claim 1, characterized in that: The ratio of the depth of the rebound groove (110) to the length of the elastic end plate (100) is in the range of 1:4 to 1:

5.

4. The buffer structure according to claim 1, characterized in that: The cross-sectional shape of the rebound groove (110) is set to be a right triangle, and a side wall of the rebound groove (110) is set to be a right-angled side.

5. The buffer structure according to claim 4, characterized in that: The angle between the two side walls of the rebound groove (110) is set to 30°.

6. The buffer structure according to claim 4, characterized in that: The side wall of the rebound groove (110) away from the fixing member is set as a right-angled side.

7. The buffer structure according to any one of claims 1 to 6, characterized in that: The material of the elastic end plate (100) is set to polyhexamethylene adipamide or a mixture, wherein the mixture includes polycarbonate and acrylonitrile-butadiene-styrene copolymer.

8. The buffer structure according to any one of claims 1 to 6, characterized in that: A reinforcing rib (120) is provided on one surface of the elastic end plate (100).

9. The buffer structure according to any one of claims 1 to 6, characterized in that: The elastic end plate (100) is provided with a limiting groove (111) for preventing the fixing member from shifting.

10. A battery, characterized in that: The buffer structure (10) comprises the buffer structure (10) according to any one of claims 1 to 9.

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