Module buffering bandage and battery module

Abstract

The utility model relates to the technical field of energy storage equipment, in particular to a module buffering binding band and a battery module, the module buffering binding band comprises a first binding band and a third binding band which are sequentially connected into a ring shape, the first binding band and the third binding band extend along a first direction, the first binding band and the third binding band are respectively provided with a first bending part, and the first bending part is provided with a second bending part; the first bending part protrudes or sinks in the second direction, the first bending part is arranged in a penetrating mode in the third direction, and the first direction, the second direction and the third direction are perpendicular pairwise. The battery module comprises a plurality of batteries and the module buffering bandage, the batteries are sequentially arranged in the first direction, the module buffering bandage is arranged on the batteries in a sleeving mode, and the thickness directions of the batteries are all the first direction. According to the battery module, the module buffer bandage can be conveniently assembled, and the module buffer bandage can be prevented from being broken in the later period of use.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a module buffer strap and a battery module. Background Technology

[0002] The reinforcement method of using straps to bind battery modules has advantages in terms of energy density and cost. However, the straps are difficult to assemble, and in the later stages of multiple battery module cycles, insufficient expansion space may occur, leading to excessive expansion force that causes the straps to break or even cause short circuit failure. Utility Model Content

[0003] One objective of this invention is to provide a modular buffer strap that facilitates assembly and prevents breakage during later use.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A modular buffer strap is provided, comprising a first strap and a third strap connected in sequence to form a ring. The first strap and the third strap both extend along a first direction. The first strap and the third strap are each provided with a first curved portion. The first curved portion protrudes or is recessed along a second direction. The first curved portion is provided through a third direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0006] Optionally, the first strap is provided with a plurality of first bends, and the bending radius of the cross-section of the plurality of first bends on the first strap includes at least two values;

[0007] And / or, the third strap is provided with a plurality of first curved portions, and the bending radius of the cross-section of the plurality of first curved portions on the third strap includes at least two values.

[0008] Optionally, it also includes a second strap and a fourth strap, both of which extend along the second direction. Both the second strap and the fourth strap are provided with a second curved portion, which protrudes or is recessed along the first direction and is provided through the third direction.

[0009] Optionally, the second and fourth straps are respectively disposed close to the end plates at both ends, and the first and third straps have a wear-resistant layer at the position near the end plates.

[0010] Optionally, the range of the protrusion height or the recess depth of the first curved portion is 1mm-5mm;

[0011] And / or, the value of the protrusion height or the recess depth of the second bend is in the range of 1mm-5mm.

[0012] Optionally, the bending radius of the second bent portion is greater than or equal to twice the thickness of the module buffer strap.

[0013] Optionally, the first strap has a first curved portion at its center along the first direction;

[0014] And / or, the third strap is provided with the first curved portion at the middle of the first direction;

[0015] And / or, the second strap has a second bend at its center along the second direction;

[0016] And / or, the fourth strap is provided with the second bend at the middle of the second direction.

[0017] Another objective of this utility model is to provide a battery module that facilitates the assembly of the module buffer strap and prevents the module buffer strap from breaking during later use.

[0018] To achieve this objective, the present invention adopts the following technical solution:

[0019] A battery module is provided, including a plurality of batteries and the module buffer strap described above. The plurality of batteries are arranged sequentially along a first direction, and the module buffer strap is sleeved on the plurality of batteries. The thickness direction of the plurality of batteries is the first direction.

[0020] Optionally, after the first curved portion is elongated along the first direction, the ratio of the length of the increased first strap to the sum of the dimensions of the plurality of batteries along the first direction when they are not expanded ranges from 3% to 10%.

[0021] Optionally, both the second strap and the fourth strap are provided with a second curved portion. The second curved portion protrudes or is recessed along the first direction and is provided through the third direction. When the second curved portion is stretched along the second direction, the length of the second strap increases by a. When the second curved portion is not stretched, the length of the second strap is b, satisfying that the value of a / b is in the range of 1%-5%.

[0022] The beneficial effects of this utility model are:

[0023] This utility model provides a module buffer strap, including a first strap and a third strap connected in a ring shape. Both the first and third straps extend along a first direction and each has a first curved portion. The first curved portion protrudes or is recessed along a second direction and extends through a third direction. The first, second, and third directions are perpendicular to each other. When the first and third straps are subjected to a force along the first direction that causes them to elongate, the first and second curved portions can be flattened and deformed, increasing the length of the first and third straps. Similarly, the lengths of the second and fourth straps can also be increased. Therefore, this module buffer strap is easier to assemble onto the module and is less prone to breakage due to excessive expansion force of the battery module in the later stages of use.

[0024] This utility model also provides a battery module, including multiple batteries and the aforementioned module buffer strap. The multiple batteries are arranged sequentially along a first direction, and the module buffer strap is sleeved on the multiple batteries. The thickness direction of the multiple batteries is the first direction. This battery module facilitates the assembly of the module buffer strap and prevents the module buffer strap from breaking during later use. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the module buffer strap provided in this embodiment of the utility model;

[0026] Figure 2 This is a partial structural schematic diagram of the battery module provided in this embodiment of the utility model.

[0027] In the picture:

[0028] 1. First strap; 11. First bend; 12. Wear-resistant layer;

[0029] 2. Second strap; 21. Second bend;

[0030] 3. Third strap; 4. Fourth strap;

[0031] 100. Module buffer strap; 200. Battery; 300. End plate; 400. Fifth strap. Detailed Implementation

[0032] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the drawings, not all of them.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections 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.

[0034] 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.

[0035] like Figure 1 As shown, the modular buffer strap 100 of this embodiment includes a first strap 1, a second strap 2, a third strap 3, and a fourth strap 4 connected in a ring shape. The first strap 1 and the third strap 3 extend along a first direction, and the second strap 2 and the fourth strap 4 extend along a second direction. Each of the first strap 1 and the third strap 3 has a first curved portion 11, which protrudes or retracts along the second direction and extends through a third direction. Each of the second strap 2 and the fourth strap 4 has a second curved portion 21, which protrudes or retracts along the first direction and extends through a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. When the first strap 1 and the third strap 3 are subjected to a force along the first direction that causes them to elongate, the first curved portion 11 and the second curved portion 21 can be stretched and deformed, thereby increasing the length of the first strap 1 and the third strap 3. Similarly, the lengths of the second strap 2 and the fourth strap 4 can also be increased, making it easier to assemble the module buffer strap 100 onto the module. Moreover, it is less likely to break due to excessive expansion force of the battery module in the later stages of use, providing the battery 200 with corresponding expansion space, thereby reducing problems such as structural safety issues, capacity drops, and insulation failure caused by increased expansion force.

[0036] Of course, in other embodiments, the first bend 11 may only be provided on the first strap 1 and the third strap 3, and the second bend 21 may not be provided on the second strap 2 and the fourth strap 4. In other embodiments, the second bend 21 may only be provided on the second strap 2 and the fourth strap 4, and the first bend 11 may not be provided on the first strap 1 and the third strap 3, depending on actual needs.

[0037] Optionally, multiple first curved portions 11 are provided. Optionally, in this embodiment, the protruding first curved portions 11 and the recessed first curved portions 11 are arranged alternately in sequence, that is, one first curved portion 11 protrudes towards the battery module, the next first curved portion 11 protrudes outward, and the next first curved portion 11 protrudes towards the battery module again, and so on. The above design can prevent sharp edges from appearing.

[0038] Optionally, multiple second curved portions 21 are provided. Optionally, in this embodiment, the protruding second curved portions 21 and the recessed second curved portions 21 are arranged alternately in sequence, that is, one second curved portion 21 protrudes towards the battery module, the next second curved portion 21 protrudes outward, and the next second curved portion 21 protrudes towards the battery module again, and so on. The above design can prevent sharp edges from appearing.

[0039] Optionally, the plurality of first bends 11 on the first strap 1 can be connected to each other, or the plurality of first bends 11 on the first strap 1 can be spaced apart.

[0040] Optionally, the plurality of first bends 11 on the third strap 3 can be connected to each other, or the plurality of first bends 11 on the third strap 3 can be spaced apart.

[0041] Optionally, the plurality of second bends 21 on the second strap 2 can be connected to each other, or the plurality of second bends 21 on the second strap 2 can be spaced apart.

[0042] Optionally, the plurality of second bends 21 on the fourth strap 4 can be connected to each other, or the plurality of second bends 21 on the fourth strap 4 can be spaced apart.

[0043] Optionally, the first strap 1 is provided with a plurality of first curved portions 11, and the bending radius of the cross-section of the plurality of first curved portions 11 on the first strap 1 includes at least two values. The bending radius of the cross-section of the first curved portion 11 refers to the bending radius of the curve in the plane after being cut by a plane perpendicular to a third direction. That is, the bending radius of the curves corresponding to the plurality of first curved portions 11 on the first strap 1 includes at least two values, that is, two, three, four, five or more values. It can be set such that the bending radius of the curves corresponding to some of the first curved portions 11 is the same, the bending radius of the curves corresponding to some of the first curved portions 11 is different, or the bending radius of the curves corresponding to all the first curved portions 11 is different. When the bending radius of the curves corresponding to the plurality of first curved portions 11 on the first strap 1 has two values, that is, the bending radius of the curves corresponding to some of the first curved portions 11 is A, and the bending radius of the curves corresponding to the remaining first curved portions 11 is B. Optionally, if the bending radius A is smaller than the bending radius B, and the bending radius A ≤ 5mm, this part of the first bending portion 11 is easier to stretch; if the bending radius B > 5mm, this part of the first bending portion 11 is more difficult to stretch.

[0044] As the battery 200 ages, the maximum expansion force on the module buffer strap 100 also increases. To accommodate the expansion and contraction characteristics of the battery 200 at different stages, the first strap 1 needs to be able to contract and recover under different expansion forces. The above design, where multiple first bends 11 on the first strap 1 have varying degrees of stretching difficulty, achieves this function. Specifically, when the battery 200 is first used, some of the easier-to-stretch first bends 11 perform the stretching and retraction functions, while in the later stages of battery use, the more difficult-to-stretch first bends 11 perform the stretching and retraction functions. The number of first bends 11 and the bending radius of the corresponding curves of different first bends 11 can be set according to actual conditions.

[0045] Similarly, optionally, the third strap 3 is provided with a plurality of first curved portions 11, and the bending radius of the cross-section of the plurality of first curved portions 11 on the third strap 3 includes at least two values. Here, the bending radius of the cross-section of the first curved portion 11 refers to the bending radius of the curve in the plane after being transversely cut by a plane perpendicular to the third direction. That is, the bending radius of the corresponding curve of the plurality of first curved portions 11 on the third strap 3 includes at least two values, that is, two, three, four, five or more values.

[0046] Optionally, the second strap 2 is provided with a plurality of second curved portions 21, and the bending radius of the cross-section of the plurality of second curved portions 21 on the second strap 2 includes at least two values. Here, the bending radius of the cross-section of the second curved portion 21 refers to the bending radius of the curve in the plane after being transversely cut by a plane perpendicular to a third direction. That is, the bending radius of the corresponding curve of the plurality of second curved portions 21 on the second strap 2 includes at least two values, that is, two, three, four, five or more values.

[0047] Optionally, the fourth strap 4 is provided with a plurality of second curved portions 21, and the bending radius of the cross-section of the plurality of second curved portions 21 on the fourth strap 4 includes at least two values. Here, the bending radius of the cross-section of the second curved portion 21 refers to the bending radius of the curve in the plane after being transversely cut by a plane perpendicular to a third direction. That is, the bending radius of the corresponding curve of the plurality of second curved portions 21 on the fourth strap 4 includes at least two values, that is, two, three, four, five or more values.

[0048] Optionally, the second strap 2 and the fourth strap 4 are respectively disposed close to the end plates 300 at both ends, and the first strap 1 and the third strap 3 both have a wear-resistant layer 12 near the end plates 300. The wear-resistant layer 12 is disposed on the surface of the strap, and the wear-resistant layer 12 can prevent the module buffer strap 100 from contacting the blue film of the aluminum shell and wearing it when the battery 200 expands in its own width direction after use, which could lead to poor insulation or cracking of the aluminum shell and arcing with the module buffer strap 100.

[0049] Optionally, the protrusion height or recess depth of the first curved portion 11 can range from 1mm to 5mm. If this value is too large, it will occupy too much space locally; if the value is too small, it will not achieve the effect of buffering expansion.

[0050] Similarly, optionally, the protrusion height or recess depth of the second curved portion 21 can range from 1mm to 5mm. If this value is too large, it will occupy too much space locally; if the value is too small, it will not achieve the effect of buffering expansion.

[0051] Optionally, the bending radius of the second curved portion 21 is greater than or equal to twice the thickness of the module buffer strap 100. More preferably, the bending radius of the second curved portion 21 is greater than or equal to three times the thickness of the module buffer strap 100 to prevent the bending radius from being too small, which would increase local stress and make it difficult to stretch. It should be noted that when multiple second curved portions 21 are provided on the second strap 2, and the bending radius of the cross-section of the multiple second curved portions 21 on the second strap 2 includes at least two values, the smallest bending radius is greater than or equal to twice the thickness of the module buffer strap 100, that is, at least two bending radii are greater than or equal to twice the thickness of the module buffer strap 100.

[0052] Optionally, the connection point of any two adjacent straps 1, 2, 3, and 4 is a transition surface to prevent sharp edges from scratching the components of the battery module.

[0053] Optionally, in this embodiment, the first strap 1 has a first curved portion 11 at its center along the first direction; optionally, the third strap 3 has a first curved portion 11 at its center along the first direction; optionally, the second strap 2 has a second curved portion 21 at its center along the second direction; optionally, the fourth strap 4 has a second curved portion 21 at its center along the second direction. Of course, in other embodiments, multiple first curved portions 11 and multiple second curved portions 21 can be distributed separately.

[0054] like Figure 2 As shown, this embodiment also provides a battery module, a plurality of batteries 200 and the module buffer strap 100 described above. The plurality of batteries 200 are arranged sequentially along a first direction, and the module buffer strap 100 is sleeved on the plurality of batteries 200. The thickness direction of the plurality of batteries 200 is the first direction.

[0055] That is, the first strap 1 and the third strap 3 are used to constrain the expansion and deformation of the multiple batteries 200 along the thickness direction, and the second strap 2 and the fourth strap 4 are used to constrain the expansion and deformation of the multiple batteries 200 along the width direction.

[0056] Optionally, in this embodiment, the end plates 300 at both ends are also fixed within the module buffer strap 100.

[0057] Optionally, when the multiple batteries 200 expand, the first curved portion 11 is elongated along the first direction, the length of the first strap 1 increases by c, and the sum of the dimensions of the multiple batteries 200 along the first direction when they are not expanded, i.e., the sum of the thicknesses of the multiple batteries 200, is d. The ratio of c to d ranges from 3% to 10%. Of course, the dimensional characteristics of the third strap 3 are consistent with those of the first strap 1, and this range can meet the expansion requirements of the batteries 200 along the first direction in the later stages of battery module use.

[0058] Optionally, after the second curved portion 21 is extended along the second direction, the length of the second strap 2 increases by 'a'. When the second curved portion 21 is not extended, the length of the second strap 2 is 'b', satisfying a / b within the range of 1%-5%. Of course, the dimensional characteristics of the fourth strap 4 are consistent with those of the second strap 2, and this range can meet the expansion requirements of the battery 200 along the second direction during the later stages of battery module use.

[0059] Optionally, the battery module is also provided with a fifth strap 400, which is sleeved on multiple batteries 200 and is arranged parallel to and spaced apart from the module buffer strap 100. However, the fifth strap 400 is not provided with a first bending part 11 or a second bending part 21 or other buffer structures. It is mainly used to constrain the structure of the battery module during the early assembly, transportation and use process.

[0060] The battery module facilitates the assembly of the module buffer strap 100 and prevents the module buffer strap 100 from breaking during later use.

[0061] The aforementioned module buffer strap 100 features buffer structure characteristics designed in different directions, which improves the cycle life of the battery 200, the expansion space of the battery 200, and module safety. The first-direction buffer structure characteristic of the module buffer strap 100, namely the first curved portion 11, also has a certain assembly absorption capacity for thickness deviations during battery 200 stacking. More importantly, the first-direction buffer structure characteristic of the module buffer strap 100, namely the first curved portion 11, can provide expansion space in the thickness direction of the battery 200, reducing the expansion force at the module level and improving structural safety. Furthermore, the second-direction buffer structure characteristic of the module buffer strap 100, namely the second curved portion 21, can provide expansion space in the width direction of the battery 200, reducing the risk of contact wear between the blue film and the module buffer strap 100 after the battery 200 expands in the width direction, thereby ensuring the insulation performance of the battery module.

[0062] 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 other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations 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 modular cushioning strap, characterized in that, The first strap (1), the second strap (2), the third strap (3) and the fourth strap (4) are sequentially connected into a ring, the first strap (1) and the third strap (3) extend along a first direction, the second strap (2) and the fourth strap (4) extend along a second direction, the first strap (1) and the third strap (3) are provided with a first bending part (11), the first bending part (11) protrudes or is recessed along the second direction, the first bending part (11) is provided through along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

2. The modular cushioning strap of claim 1, wherein, A plurality of first bending parts (11) are arranged on the first strap (1), and the bending radius of the cross section of the plurality of first bending parts (11) on the first strap (1) includes at least two values. And / or, a plurality of first bending parts (11) are arranged on the third strap (3), and the bending radius of the cross section of the plurality of first bending parts (11) on the third strap (3) includes at least two values.

3. The modular cushioning strap of claim 1, wherein, The second strap (2) and the fourth strap (4) are provided with a second bending part (21), the second bending part (21) protrudes or is recessed along the first direction, and the second bending part (21) is provided through along the third direction.

4. The modular cushioning strap (100) of claim 3, wherein, The second strap (2) and the fourth strap (4) are arranged close to end plates (300) at two ends, respectively, and the first strap (1) and the third strap (3) have wear-resistant layers (12) close to the end plates (300).

5. The modular cushioning strap of claim 3, wherein, The protrusion height or the recess depth of the first bending part (11) ranges from 1mm to 5mm. And / or, the protrusion height or the recess depth of the second bending part (21) ranges from 1mm to 5mm.

6. The modular cushioning strap of claim 3, wherein, The bending radius of the second bending part (21) is greater than or equal to twice the thickness of the module buffer strap (100).

7. The modular cushioning strap of any of claims 3-6, wherein, The first strap (1) is provided with the first bending part (11) at the middle part along the first direction. And / or, the third strap (3) is provided with the first bending part (11) at the middle part along the first direction. And / or, the second strap (2) is provided with the second bending part (21) at the middle part along the second direction. And / or, the fourth strap (4) is provided with the second bending part (21) at the middle part along the second direction.

8. A battery module, characterized by A plurality of batteries (200) and the module buffer strap according to any one of claims 1-7 are included, the plurality of batteries (200) are sequentially arranged along the first direction, the module buffer strap (100) is sleeved on the plurality of batteries (200), and the thickness direction of the plurality of batteries (200) is the first direction.

9. The battery module of claim 8, wherein, After the first bending part (11) is elongated along the first direction, the ratio of the length of the first strap (1) to the sum of the size of the plurality of batteries (200) along the first direction when not expanded ranges from 3% to 10%.

10. The battery module of claim 8, wherein, The second binding band (2) and the fourth binding band (4) are provided with a second bending part (21), the second bending part (21) is convex or concave along the first direction, the second bending part (21) is provided through along the third direction, after the second bending part (21) is elongated along the second direction, the length of the second binding band (2) is a, when the second bending part (21) is not elongated, the length of the second binding band (2) is b, and the value range of a / b is 1%-5%.

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