Battery module

Abstract

The utility model discloses a battery module. The battery module comprises a battery pack, the number of the end plates is two, and the two end plates are arranged at the two ends of the battery pack in the arrangement direction of the single batteries in the battery pack; the binding band is bound outside the battery pack and the end plate and comprises a pair of oppositely arranged first winding parts and a pair of oppositely arranged second winding parts, the first winding parts and the second winding parts are sequentially and alternately connected, the first winding parts are arranged corresponding to the end plate, and the second winding parts are arranged on the side of the battery pack and extend in the arrangement direction; and in the height direction of the single battery, the height of the second winding part is greater than that of the first winding part. According to the battery module disclosed by the utility model, the binding bands are used as side plates at the same time, so that the grouping structure of the battery module is simplified, and the grouping cost of single batteries is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery module. Background Art

[0002] Batteries are devices used to provide energy. After production, individual batteries are typically assembled into modules, which connect multiple cells in series and parallel to provide sufficient power. When assembled into a battery module, multiple cells are arranged to form a battery pack. End plates and side plates are installed at the ends and sides of the battery pack, and finally, they are bound with steel straps to secure and restrain the battery pack and prevent excessive expansion of the cells during use. The arrangement of these components, such as steel straps, end plates, and side plates, complicates the assembly of the individual cells. Utility Model Content

[0003] To solve at least one of the problems existing in the above-mentioned prior art, according to one aspect of the present invention, a battery module is provided, comprising:

[0004] Battery pack;

[0005] Two end plates are provided at both ends of the battery pack along the arrangement direction of the single cells in the battery pack;

[0006] a binding strap, tied to the battery pack and the outside of the end plate, comprising a pair of oppositely disposed first winding portions and a pair of oppositely disposed second winding portions, wherein one first winding portion and one second winding portion are alternately connected in sequence, and the first winding portion is disposed corresponding to the end plate, and the second winding portion is disposed on the side of the battery pack and extends along the arrangement direction;

[0007] Wherein, along the height direction of the single battery, the height of the second winding portion is greater than the height of the first winding portion.

[0008] In some embodiments, the strap further includes at least one flange connected to the second winding portion, the length direction of the flange being the arrangement direction of the single cells, and the strap is provided at the top of the battery pack for applying a pressing force toward the bottom of the battery pack when the battery pack expands.

[0009] In some embodiments, the binding strap includes two cuffs, and one of the second wrapping portions is connected to one of the cuffs.

[0010] In some embodiments, the distance between the flange and the adjacent pole on the single battery is in the range of 2.0 mm to 3.0 mm.

[0011] In some embodiments, the flange and the second winding portion are arranged with equal lengths along the arrangement direction.

[0012] In some embodiments, the strap is made of aluminum.

[0013] In some embodiments, the thickness of the strap is in the range of 0.8 mm to 1.0 mm.

[0014] In some embodiments, the battery module further includes two insulating sleeves, one of the insulating sleeves being correspondingly sleeved outside one of the first winding portions.

[0015] In some embodiments, the length of the insulating sleeve is smaller than the length of the first winding portion.

[0016] In some embodiments, the first winding portion includes a straight section and an arc-shaped transition section, and the arc-shaped transition section is connected between the straight section and the second winding portion and is arranged corresponding to the side of the end plate.

[0017] In summary, the battery module provided by the present invention has the following technical effects:

[0018] When single cells are arranged to form a battery module, multiple single cells are arranged and then two end plates are provided at both ends of the arrangement direction a. The end plates and the battery pack are then bound together with a strap. Since the strap includes a high second winding portion and a low first winding portion, the first winding portion is provided corresponding to the position of the end plate and the second winding portion is provided corresponding to the side of the battery pack, so that the second winding portion can be used as a side plate. In this way, the entire strap not only achieves the binding effect of the steel strap in the prior art, but can also be used as a side plate, which simplifies the grouping structure of the entire battery module, facilitates the grouping of single cells, and reduces the grouping cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a battery module according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the battery module in the explosion;

[0021] Figure 3 for Figure 1 Schematic diagram of the structure of the strap;

[0022] Figure 4 for Figure 1 Schematic diagram of the coordination between the single battery and the flange.

[0023] Figures: 100 - battery module, 10 - battery pack, 11 - single cell, 111 - pole, 20 - end plate, 30 - binding strap, 31 - first winding portion, 311 - straight section, 312 - arc-shaped transition section, 32 - second winding portion, 33 - flange, 40 - insulating sleeve. DETAILED DESCRIPTION

[0024] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] See also Figures 1 to 4 , a battery module 100 provided in an embodiment of the present invention includes a battery pack 10 , an end plate 20 and a strap 30 .

[0029] Among them, the battery pack 10 includes a plurality of single cells 11 arranged in sequence; the end plates 20 include two, and the two end plates 20 are arranged at both ends of the battery pack 10 along the arrangement direction a of the single cells 11 in the battery pack 10; the strap 30 is tied to the outside of the battery pack 10 and the end plates 20, and includes a pair of oppositely arranged first winding portions 31 and a pair of oppositely arranged second winding portions 32, one first winding portion and one second winding portion are alternately connected in sequence, and the first winding portion 31 is arranged corresponding to the end plate 20, and the second winding portion 32 is arranged on the side of the battery pack 10 and extends along the arrangement direction a; along the height direction h of the single cell 11, the height of the second winding portion 32 is greater than the height of the first winding portion 31.

[0030] The above-mentioned battery module 100, when the single cells 11 are arranged to form the battery module 100, two end plates 20 are set at both ends of the arrangement direction a, and then the end plates 20 and the battery pack 10 are bound by a strap 30. Since the strap 30 includes a high second winding portion 32 and a low first winding portion 31, the first winding portion 31 is set corresponding to the position of the end plate 20, and the second winding portion 32 is set corresponding to the side of the battery pack 10, so that the second winding portion 32 can be used as a side plate. In this way, the entire strap 30 not only achieves the binding effect of the steel belt in the prior art, but can also be used as a side plate, which simplifies the grouping structure of the entire battery module 100, facilitates the grouping of the single cells 11, and reduces the grouping cost.

[0031] Specifically, see Figure 1 、 Figure 2 In addition, 4. In this embodiment, a square battery is used as an example. Two poles 111 are provided on the single battery 11. The multiple single batteries 11 are arranged in sequence along the thickness direction. That is, the two first winding portions 31 are provided at both ends of the single battery 11 in the arrangement direction, and the second winding portions 32 are provided on both sides of the single battery 11 in the width direction b.

[0032] Understandably, due to the thermal expansion and contraction of the battery pack 10 during long-term use, it will not only expand toward the large surface direction of the single cell 11, but will also warp along the height direction h during long-term use, thereby affecting the safety of use and the charging and discharging effect of the battery pack 10. In order to ensure the normal use of the battery pack 10, the binding strap 30 also includes at least one flange 33, which is connected to the second winding portion 32. The length direction of the flange 33 is the arrangement direction of the single cell 11. It is provided at the top of the battery pack 10 and is used to apply a pressing force to the battery pack 10 toward the bottom of the battery pack 10 when the battery pack 10 expands. In this way, by providing the flange 33, it can be buckled on the upper surface of the battery pack 10. When the battery pack 10 expands, it can limit the expansion of the battery pack 10 in the height direction h of the single cell 11, thereby preventing the battery pack 10 from excessive expansion and further ensuring the safety of use of the battery pack 10.

[0033] Furthermore, since the strap 30 of this embodiment includes two second winding portions 32, the strap 30 also includes two flanges 33, and one second winding portion 32 is connected to a flange 33. In this way, through the setting of the two flanges 33, the two sides of the battery pack 10 can be restrained along the width direction b of the single battery 11. Both sides of the battery pack 10 can be subjected to the restraining force, further ensuring the stability of the battery pack 10 in use.

[0034] Among them, see Figure 4The distance L between the flange 33 and the adjacent terminal 111 ranges from 2.0 mm to 3.0 mm, ensuring that the flange 33 is positioned as close to the terminal 111 as possible. This ensures that the flange 33 has a certain width along the width direction b of the single battery 11 to resist the expansion force of the battery pack 10. Furthermore, depending on the size of the single battery 11, the distance between the flange 33 and the adjacent terminal 111 can be set to a value such as 2.0 mm, 2.5 mm, or 3 mm, and is not limited here.

[0035] Furthermore, the flange 33 and the second winding portion 32 of this embodiment are provided with equal lengths along the arrangement direction, that is, the flange 33 is able to contact each single battery 11 to constrain the entire battery pack 10 .

[0036] Among them, the material of the strap 30 of this embodiment is aluminum. Compared with the steel material used in the prior art, aluminum has a lower density, which is about 1 / 3 of steel, so that the strap 30 can be lightweight. Furthermore, by eliminating the side panels of the strap 30, the weight of the side panels is reduced, further achieving lightweighting.

[0037] Furthermore, the thickness of the strap 30 ranges from 0.8 mm to 1.0 mm. This ensures the structural strength of the strap 30, allowing it to withstand the expansion force of the battery pack 10 while also restraining the battery pack 10. Furthermore, the weight of the strap 30 is kept within a predetermined range and is not excessively large. The thickness of the strap 30 can be set to values such as 0.8 mm, 0.9 mm, or 1.0 mm, and is not limited thereto.

[0038] Please refer to the figure. In one embodiment of the present invention, corresponding to the structure of the battery pack 10 and the end plate 20, the first winding portion 31 includes a straight section 311 and an arc-shaped transition section 312. The arc-shaped transition section 312 is connected between the straight section 311 and the second winding portion 32, corresponding to the side setting of the end plate 20. That is, at this time, the second winding portion 32 just corresponds to the side setting of the battery pack 10 to avoid the second winding portion 32 with a higher height having a portion located on the side of the end plate 20, which will interfere with the end plate 20.

[0039] Furthermore, since the end plate 20 needs to be installed with structures such as the output pole, in order to ensure electrical safety, the battery module 100 also includes two insulating sleeves 40, one insulating sleeve 40 is correspondingly arranged outside a first winding part 31, so that through the setting of the insulating sleeve 40, the first winding part 31 in contact with the end plate 20 can be blocked from the end plate 20, ensuring the creepage distance and electrical clearance between the output pole and the first winding part 31, thereby ensuring the safety of the battery pack.

[0040] The length of the insulating sleeve 40 is shorter than the length of the first winding portion 31 , specifically, shorter than the length of the straight section 311 , so that the insulating sleeve 40 can achieve a protective effect while saving production materials of the insulating sleeve 40 .

[0041] In the above-mentioned battery module 100, the strap 30 can be used as a side panel, thereby avoiding the provision of a side panel and simplifying the installation structure of the battery pack; at the same time, a flange 33 is provided on the strap 30, and the flange 33 can restrain the expansion of the battery pack 10 and resist the expansion force generated by the battery pack 10 to avoid excessive expansion of the battery pack 10 and ensure the safety of battery use; at the same time, the strap 30 is made of aluminum material, which has a lower density and can have a smaller weight.

[0042] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A battery module (100), characterized in that: include: Battery pack (10); End plates (20), comprising two end plates (20), the two end plates (20) being arranged at both ends of the battery pack (10) along the arrangement direction of the single cells (11) in the battery pack (10); A binding strap (30) is tied to the outside of the battery pack (10) and the end plate (20), and includes a pair of first winding portions (31) and a pair of second winding portions (32) arranged opposite to each other, wherein one first winding portion (31) and one second winding portion (32) are alternately connected in sequence, and the first winding portion (31) is arranged corresponding to the end plate (20), and the second winding portion (32) is arranged on the side of the battery pack (10) and extends along the arrangement direction; Wherein, along the height direction of the single battery (11), the height of the second winding portion (32) is greater than the height of the first winding portion (31).

2. The battery module (100) according to claim 1, characterized in that: The binding strap (30) further comprises at least one flange (33), the flange (33) being connected to the second winding portion (32), the length direction of the flange (33) being the arrangement direction of the single cells (11), and being arranged at the top of the battery pack (10) for applying a pressing force toward the bottom of the battery pack (10) when the battery pack (10) expands.

3. The battery module (100) according to claim 2, characterized in that: The binding belt (30) includes two flanges (33), and one second winding portion (32) is connected to one flange (33).

4. The battery module (100) according to claim 2 or 3, characterized in that: The distance between the flange (33) and the adjacent pole (111) on the single battery (11) ranges from 2.0 mm to 3.0 mm.

5. The battery module (100) according to claim 2 or 3, characterized in that: The flange (33) and the second winding portion (32) are arranged with equal lengths along the arrangement direction.

6. The battery module (100) according to any one of claims 1 to 3, characterized in that: The material of the binding strap (30) is aluminum.

7. The battery module (100) according to any one of claims 1 to 3, characterized in that: The thickness of the binding strap (30) ranges from 0.8 mm to 1.0 mm.

8. The battery module (100) according to any one of claims 1 to 3, characterized in that: The battery module (100) further includes two insulating sleeves (40), one of the insulating sleeves (40) being correspondingly sleeved outside one of the first winding portions (31).

9. The battery module (100) according to claim 8, characterized in that: The length of the insulating sleeve (40) is smaller than the length of the first winding portion (31).

10. The battery module (100) according to any one of claims 1 to 3, characterized in that: The first winding portion (31) comprises a straight section (311) and an arcuate transition section (312); the arcuate transition section (312) is connected between the straight section (311) and the second winding portion (32), and is arranged corresponding to the side of the end plate (20).

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