BMS protection structure and battery pack

Abstract

The utility model provides a BMS (Battery Management System) protection structure and a battery pack, the BMS protection structure is arranged between the top of a BMS module and an upper shell of the battery pack, and the BMS protection structure comprises a protection plate; the protection plate comprises two plate bodies arranged at intervals in the height direction and a plurality of reinforcing ribs arranged between the two plate bodies. The reinforcing ribs extend in the length direction of the plate body and are arranged at intervals in the width direction of the plate body. Cavities with polygonal cross sections can be defined between the reinforcing ribs and the plate bodies and between every two adjacent reinforcing ribs and the two plate bodies. According to the BMS protection structure, through the arrangement of the two plate bodies and the reinforcing ribs, the overall strength and rigidity of the protection plate can be improved through the reinforcing ribs, and the structural strength of the protection plate can be further improved through the cavity, so that the protection effect on the BMS module is improved. And meanwhile, the BMS protection structure can support the upper shell of the battery pack, so that the structural strength of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field, especially a kind of BMS protection structure.This utility model further relates to a battery pack with the above-mentioned BMS protection structure. BACKGROUND

[0002] With the rapid development of electric vehicles and energy storage system technology, as the core component to ensure the safe and efficient operation of battery pack, the reliability and stability of BMS module are crucial.

[0003] BMS module is usually installed in battery pack, and the top of BMS module is tightly attached to the upper shell of battery pack. However, when the upper shell of battery pack is stepped on, external force can act on the top of BMS module through the upper shell of battery pack, causing BMS module to be easily damaged by stepping. In the prior art, buffer foam is usually provided between BMS module and the upper shell of battery pack to protect BMS module, but there is still a problem of poor protection effect. SUMMARY

[0004] Therefore, the utility model aims to provide a BMS protection structure to improve the protection effect of BMS module and improve the structural strength of battery pack.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A BMS protection structure is arranged between the top of BMS module and the upper shell of battery pack, and the BMS protection structure comprises a protection plate.

[0007] The protection plate comprises two plate bodies arranged at intervals along the height direction, and a plurality of reinforcing ribs arranged between the two plate bodies.

[0008] Each reinforcing rib extends along the length direction of the plate body and is arranged at intervals along the width direction of the plate body.

[0009] The cavity with polygonal cross section can be formed between each reinforcing rib and each plate body, and between adjacent two reinforcing ribs and two plate bodies.

[0010] Further, the reinforcing rib comprises a first part parallel to the plate body and a second part formed by the end part of the first part; the two ends of the first part are respectively forked to form two second parts connected with two plate bodies; each second part and the first part can form two cavities with quadrilateral cross sections with two plate bodies on the same reinforcing rib; each second part can form a cavity with hexagonal cross section with two plate bodies between two adjacent reinforcing ribs.

[0011] Further, the relationship between the interval a between two plate bodies and the thickness t1 of the plate body satisfies a>=3*t1.

[0012] Further, the included angle a between the first part and the second part satisfies 120<=a<=150.

[0013] Further, the relationship between the length d of the first part and the interval a between two plate bodies satisfies 0.5*a<=d<=a.

[0014] Further, the relationship between the interval c between two adjacent reinforcing ribs and the interval a between two plate bodies satisfies 3*a<=c<=5*a.

[0015] Further, the relationship between the thickness t2 of the first part and the second part and the thickness t1 of the plate body satisfies 0.5*t1<=t2<=t1.

[0016] Further, a round corner is formed at the connection between the second part and the plate body; the relationship between the radius r of the round corner and the thickness t2 of the first part and the second part satisfies 0.5*t2<=r<=t2.

[0017] Further, a plurality of bolts for fixing the protective plate on the top of the BMS module are further included; each bolt is respectively arranged at a corner of the protective plate, and the bolt penetrates two plate bodies; from the width direction of the plate body, each reinforcing rib is located between two adjacent bolts.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The BMS protection structure is characterized in that two plate bodies and the reinforcing ribs are arranged, the reinforcing ribs can form a cavity together with the two plate bodies, the reinforcing ribs can increase the strength and rigidity of the protection plate as a whole, the cavity can disperse stress to the whole structure of the protection plate, thereby avoiding the concentration of stress in a local area and further improving the structural strength of the protection plate, so that the protection effect on the BMS module is improved.

[0020] In addition, the reinforcing rib comprises a first part and a second part, has good structural stability, and can ensure the supporting effect of the reinforcing rib on the two plate bodies in the height direction and improve the structural strength of the protection plate.

[0021] In addition, the relationship between the length d of the first part and the distance a between the two plate bodies satisfies 0.5*a≤d≤a, so that the supporting effect of the reinforcing rib on the two plate bodies can be improved while the cost is reduced as much as possible.

[0022] In addition, the relationship between the length d of the first part and the distance a between the two plate bodies satisfies 0.5*a≤d≤a, so that the supporting effect of the reinforcing rib on the two plate bodies can be improved while the cost is reduced as much as possible.

[0023] Another purpose of the utility model lies in providing a battery pack, wherein the BMS protection structure is arranged in the battery pack.

[0024] Compared with the prior art, the battery pack and the BMS protection structure have the same technical effect, and details are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which form a part of this patent, are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0026] Figure 1 The overall structure schematic view of the BMS protection assembly according to the embodiment one of the application;

[0027] Figure 2 The front view of the BMS protection assembly according to the embodiment one of the application;

[0028] Figure 3 The enlarged view of the position A in the embodiment of the application; Figure 2

[0029] Figure 4 The top view of the BMS protection assembly according to the embodiment one of the application;

[0030] Figure 5 The schematic view of the BMS protection assembly according to the embodiment one of the application arranged in the battery pack;

[0031] Explanation of reference signs:

[0032] 1, protection plate;

[0033] 101, plate body;

[0034] 102, reinforcing rib; 1021, first part; 1022, second part;

[0035] 2, bolt;

[0036] 3, BMS module;

[0037] 4, upper shell of battery pack;

[0038] 5, lower shell of battery pack;

[0039] 6, BMS support. DETAILED DESCRIPTION

[0040] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0041] In the following description, specific details are set forth in order to provide a thorough understanding of the application. However, persons of ordinary skill in the art will readily recognize that the application can be practiced without these specific details. In other instances, well-known structures, devices, circuits, and processes have not been described in detail so as not to unnecessarily obscure the application.​

[0042] In the description of the utility model, it is explained that if the terms indicating the orientation or position relationship such as 'up', 'down', 'inner', 'outer' appear, it is based on the orientation or position relationship shown in the drawing, and it is only for the convenience of describing the utility model and simplifying the description, and therefore it cannot be understood as the limitation of the utility model. In addition, if the terms such as 'first','second' appear, they are only used for the description purpose, and therefore it cannot be understood as indicating or implying the relative importance.

[0043] In addition, in the description of the utility model, unless otherwise explicitly limited, the terms'mounting', 'connection', 'connecting', 'connecting piece' should be understood in a broad sense. For example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with the specific circumstances.

[0044] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0045] Embodiment one

[0046] This embodiment relates to a BMS protection structure, which is arranged between the top of the BMS module 3 and the battery pack upper shell 4. As shown in Figure 1 、 Figure 2 , the overall structure, the BMS protection structure includes a protection plate 1, and the protection plate 1 includes two plate bodies 101 and a plurality of reinforcing ribs 102 arranged between the two plate bodies 101.

[0047] Among them, two plate bodies 101 are arranged along the height direction, and each reinforcing rib 102 extends along the length direction of the plate body 101 and is arranged along the width direction of the plate body 101. The cavity with polygonal cross section can be formed between each reinforcing rib 102 and each plate body 101, and between the adjacent two reinforcing ribs 102 and the two plate bodies 101.

[0048] When the battery pack upper shell 4 is stepped on, the protection plate 1 is subjected to external force to protect the BMS module 3.

[0049] As described above, by the arrangement of the two plate bodies 101 and the reinforcing ribs 102, each reinforcing rib 102 can form a cavity together with the two plate bodies 101, the reinforcing rib 102 can increase the strength and rigidity of the protective plate 1 as a whole, the cavity can be used as a frame structure to disperse stress to the entire structure of the protective plate 1, avoid stress concentration in a certain local area, further improve the structural strength of the protective plate 1, and improve the protection effect on the BMS module 3. At the same time, the BMS protection structure can support the battery pack upper shell 4, thereby improving the structural strength of the battery pack.

[0050] Based on the above overall introduction, specifically, the BMS protection structure of the embodiment can also prevent the battery pack upper shell 4 from directly rubbing against the top of the BMS module 3, thereby avoiding the occurrence of wear and abnormal sound of the battery pack upper shell 4. In addition, the four corners of each plate body 101 of the embodiment are formed with a circular arc corner, so as to avoid stress concentration at the four corners of the plate body 101 and easy breakage when the protective plate 1 is subjected to external force.

[0051] In addition, since the space between the top of the BMS module 3 and the battery pack upper shell 4 is limited, in order to reduce the space occupied by the BMS protection structure, that is, the protective plate 1, while ensuring the structural strength of the plate body 101, as shown in Figure 3 、 Figure 4 , the thickness t1 of the plate body 101 of the embodiment satisfies: 0.5mm≤t1≤1mm, so as to ensure sufficient thickness and reduce the space occupied by the protective plate 1 as much as possible. In specific implementation, the radius R of the circular arc corner is ≥4mm. At the same time, the buffer foam can be arranged between the protective plate 1 and the battery pack upper shell 4, and between the protective plate 1 and the BMS module 3, so as to improve the buffering effect and improve the protection effect on the BMS module 3.

[0052] As a specific implementation form, as shown in Figure 2 , in the embodiment, from the extension direction of the reinforcing rib 102, the reinforcing rib 102 includes a first part 1021 parallel to the plate body 101, and a second part 1022 formed by the end portion of the first part 1021.

[0053] Among them, the two ends of the first part 1021 are respectively bifurcated to form two second parts 1022 connected with the two plate bodies 101. On the same reinforcing rib 102, each second part 1022 and the first part 1021 can form two cavities with quadrilateral cross sections, that is, trapezoidal cavities, together with the two plate bodies 101. While between the two adjacent reinforcing ribs 102, each second part 1022 can form a cavity with a hexagonal cross section together with the two plate bodies 101.

[0054] It can be understood that if a single plate is supported between the two plate bodies 101, when the protective plate 1 is subjected to external force, the middle part of the plate is prone to lateral displacement due to the pressure between the two plate bodies 101, causing the plate to be bent, so that the protective plate 1 is crushed, and the protection effect on the BMS module 3 is insufficient.

[0055] In the present embodiment, two second parts 1022 are formed at both ends of the first part 1021, and the two second parts 1022 at the same end have an included angle, so that the first part 1021 and the two second parts 1022 at either end form a Y-shaped structure.

[0056] When the protective plate 1 is subjected to external force, the two second parts 1022 at the same end can form support between the two plate bodies 101 in the height direction, at this time the plate body 101 extrudes the two second parts 1022, so that the connection of the two second parts 1022 has a tendency to move laterally, and the first part 1021 arranged laterally can support the connection, and the first part 1021 can simultaneously support each second part 1022 at both ends in the lateral direction, ensuring the structural stability of the reinforcing rib 102, and preventing the second part 1022 from being bent due to pressure, thereby ensuring the supporting effect of the reinforcing rib 102 on the two plate bodies 101 in the height direction, and improving the structural strength of the protective plate 1.

[0057] In order to make the protective plate 1 have a certain buffering and energy absorption effect, the relationship between the spacing a between the two plate bodies 101 and the thickness t1 of the plate body 101 in the present embodiment satisfies a≥3*t1. To ensure that there is enough spacing between the two plate bodies 101 to ensure that the protective plate 1 has a certain buffering and energy absorption effect, thereby improving the protection effect on the BMS module 3.

[0058] It can be understood that when the included angle between the first part 1021 and the second part 1022 is small, the first part 1021 cannot effectively support each second part 1022 in the lateral direction, causing the second part 1022 to be easily extruded and bent when subjected to pressure in the height direction between the two plate bodies 101. At the same time, the small included angle between the first part 1021 and the second part 1022 also reduces the stability of the reinforcing rib 102 as a whole, making the first part 1021 prone to lateral displacement and resulting in structural failure. When the included angle between the first part 1021 and the second part 1022 is large, each second part 1022 cannot effectively support the two plate bodies 101 in the height direction, causing the cavities between the two plate bodies 101 to be easily crushed, thereby causing the protective plate 1 to be damaged.

[0059] Therefore, in order to improve the supporting effect of the reinforcing rib 102 on the two plate bodies 101, the included angle between the first part 1021 and the second part 1022 is preferably 30°-60°. Figure 3As shown, the included angle a between the first part 1021 and the second part 1022 satisfies: 120°≤a≤150°, so as to ensure the stability of the reinforcing rib 102 as a whole and the supporting effect on the two plate bodies 101, improve the structural strength of the protection plate 1 as a whole, and improve the protection effect.

[0060] In the embodiment, the length d of the first part 1021 and the spacing a between the two plate bodies 101 satisfy: 0.5*a≤d≤a. It can be understood that when the length d of the first part 1021 is too small, the width of the reinforcing rib 102 is small, and in order to ensure the supporting effect of the reinforcing rib 102 on the two plate bodies 101, the number of reinforcing ribs 102 needs to be increased, which increases the production cost of the protection plate 1, and when the length d of the first part 1021 is too large, the transverse supporting effect of the first part 1021 on the second parts 1022 at both ends is poor, and when each second part 1022 is subjected to pressure from the plate body 101, the first part 1021 is easily extruded and bent at the connection of the second part 1022. Therefore, by controlling the relationship between the length d of the first part 1021 and the spacing a between the two plate bodies 101, the supporting effect of the reinforcing rib 102 on the two plate bodies 101 can be improved while the cost is as low as possible, and the protection effect on the BMS module 3 can be ensured.

[0061] In addition, the spacing c between the two adjacent reinforcing ribs 102, i.e. the distance from one side of one reinforcing rib 102 to the other side of another reinforcing rib 102, and the spacing a between the two plate bodies 101 satisfy: 3*a≤c≤5*a. By controlling the relationship between the spacing c and the spacing a between the two plate bodies 101, the distance between the two reinforcing ribs 102 can be avoided to be too large, so that the width of the cavity is too large, and the structural strength of the protection plate 1 is reduced. At the same time, the number of reinforcing ribs 102 is also reduced, which is beneficial to saving the production cost of the protection plate 1.

[0062] In addition, the thickness t2 of the first part 1021 and the second part 1022 and the thickness t1 of the plate body 101 satisfy: 0.5*t1≤t2≤t1, so that the first part 1021 and the second part 1022 have sufficient thickness, improve the structural strength of the reinforcing rib 102, and then ensure the structural strength of the protection plate 1, and improve the protection effect.

[0063] To prevent the connection strength between the plate body 101 and the reinforcing rib 102 from being reduced due to stress concentration, the second part 1022 of the present embodiment is formed with a fillet at the connection with the plate body 101. The relationship between the radius r of the fillet and the thickness t2 of the first part 1021 and the second part 1022 satisfies: 0.5*t2≤r≤t2, so as to ensure a smooth transition at the connection between the second part 1022 and the plate body 101, avoid stress concentration, and improve the connection effect between the reinforcing rib 102 and the plate body 101. In specific implementation, the connection between the first part 1021 and the second part 1022 is also provided with a fillet, so as to make the first part 1021 and the second part 1022 smoothly transition, avoid stress concentration in the reinforcing rib 102, and further improve the structural strength of the reinforcing rib 102.

[0064] Finally, the BMS protection assembly of the present embodiment further includes a plurality of bolts 2 for fixing the protection plate 1, each bolt 2 is respectively arranged at the four corners of the protection plate 1, and the bolt 2 penetrates through the two plate bodies 101, and can fix the protection plate 1 on the top of the BMS module 3. And each bolt 2 is fixed at the edge corner of the top of the BMS module 3, and the quadrilateral area surrounded by the four bolts 2 covers the BMS module 3, so from the width direction of the plate body 101, each reinforcing rib 102 is located between two adjacent bolts 2, which can make the reinforcing rib 102 reinforce the area of the plate body 101 covering the BMS module 3, and no reinforcing rib 102 is arranged outside the above-mentioned quadrilateral area, so as to reduce the production cost of the protection plate 1 while ensuring the protection effect.

[0065] In specific implementation, as shown in Figure 4 each bolt 2 is screwed on the fixing bolt of the top shell of the BMS module 3. At the same time, the distance A between the two bolts 2 arranged in the length direction of the plate body 101 satisfies the relationship: L-A≥20mm with the length L of the plate body 101. And the distance B between the two bolts 2 arranged in the width direction of the plate body 101 satisfies the relationship: W-B≥20mm with the width W of the plate body 101. So that the edge of the plate body 101 outside the above-mentioned quadrilateral area has sufficient width to ensure that the mounting hole of the plate body 101 for penetrating the bolt 2 has sufficient structural strength. In addition, the distance b between the reinforcing rib 102 close to the bolt 2 and the bolt 2 satisfies: b≥0.2mm, so as to avoid the mounting hole being too close to the reinforcing rib 102 and causing the structural strength of the connection between the reinforcing rib 102 and the plate body 101 to be reduced.

[0066] In summary, the BMS protection structure of the embodiment, through the setting of the two plate bodies 101 and the reinforcing ribs 102, each reinforcing rib 102 can form a cavity with the two plate bodies 101, the reinforcing rib 102 can increase the strength and rigidity of the protection plate 1 as a whole, the cavity can disperse stress to the whole structure of the protection plate 1 as a frame structure, avoid the stress concentration in a local area, further improve the structural strength of the protection plate 1, so as to improve the protection effect on the BMS module 3. At the same time, the BMS protection structure can support the battery pack upper shell 4, thereby improving the structural strength of the battery pack, and has good practicability.

[0067] Embodiment two

[0068] The embodiment relates to a battery pack provided with the BMS protection structure as described in embodiment one. Wherein, the BMS module 3 is fixed on the battery pack lower shell 5 through the BMS support 6, and the BMS protection structure is arranged between the top of the BMS module 3 and the battery pack upper shell 4.

[0069] The battery pack of the embodiment, through the setting of the above-mentioned BMS protection structure, can avoid the deformation of the battery pack upper shell 4 due to stepping, so as to avoid the damage of the BMS module 3, improve the protection effect on the BMS module 3, and improve the reliability of the battery pack.

[0070] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1.A BMS protection structure arranged between a top of a BMS module and an upper shell of a battery pack, the BMS protection structure comprising: a protection plate; the protection plate comprising two plate bodies arranged in a height direction and a plurality of reinforcing ribs arranged between the two plate bodies; each of the reinforcing ribs extending along a length direction of the plate bodies and arranged in a width direction of the plate bodies; and each of the reinforcing ribs and the plate bodies, and each of two adjacent reinforcing ribs and the plate bodies, being capable of forming a cavity with a polygonal cross section. 2.The BMS protection structure of claim 1, wherein: each of the reinforcing ribs comprises a first portion parallel to the plate bodies and a second portion formed by a split end of the first portion; two ends of the first portion are split to form two second portions connected to the two plate bodies, respectively; each of the second portions and the first portion on the same reinforcing rib is capable of forming two cavities with a quadrilateral cross section with the two plate bodies, respectively; and each of the second portions is capable of forming a cavity with a hexagonal cross section with the two plate bodies between two adjacent reinforcing ribs. 3.The BMS protection structure of claim 1, wherein: a relationship between a spacing a between the two plate bodies and a thickness t1 of the plate bodies satisfies a≥3*t1. 4.The BMS protection structure of claim 2, wherein: an included angle a between the first portion and the second portion satisfies 120°≤a≤150°. 5.The BMS protection structure of claim 2, wherein: a relationship between a length d of the first portion and the spacing a between the two plate bodies satisfies 0.5*a≤d≤a. 6.The BMS protection structure of claim 5, wherein: a relationship between a spacing c between two adjacent reinforcing ribs and the spacing a between the two plate bodies satisfies 3*a≤c≤5*a. 7.The BMS protection structure of claim 2, wherein: a relationship between a thickness t2 of the first portion and the second portion and the thickness t1 of the plate bodies satisfies 0.5*t1≤t2≤t1. 8.The BMS protection structure of claim 2, wherein: a connecting portion between the second portion and the plate body is formed with a fillet; and a relationship between a radius r of the fillet and the thickness t2 of the first portion and the second portion satisfies 0.5*t2≤r≤t2. 9.The BMS protection structure of any one of claims 1 to 8, further comprising: a plurality of bolts for fixing the protection plate on the top of the BMS module; each of the bolts is arranged at a corner of the protection plate and penetrates the two plate bodies; and each of the reinforcing ribs is located between two adjacent bolts in the width direction of the plate bodies. 10.A battery pack, comprising: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The battery pack is provided with the BMS protection structure according to any one of claims 1 to 9.

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