Battery cell module supporting structure and battery pack

Abstract

The utility model provides a battery cell module supporting structure and a battery pack, the battery cell module supporting structure comprises a supporting body arranged at the bottom of a battery pack frame; first concave parts are arranged at the top of the supporting body, second concave parts are arranged at the bottom of the supporting body, the multiple first concave parts and the multiple second concave parts are arranged in the width direction of the supporting body at intervals, and any second concave part corresponds to the multiple first concave parts. According to the battery cell module supporting structure disclosed by the utility model, the connection strength between the battery cell module and the supporting structure and the structural strength of the supporting structure can be improved, and the use safety of a battery pack is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a support structure for a battery cell module. At the same time, the utility model also relates to a battery pack provided with the support structure for the battery cell module. Background Art

[0002] With the strong promotion of the new energy field by the country, electric vehicles have become one of the mainstream trends at present and in the future. The battery pack is even the most important power supply component of electric vehicles. At present, most battery packs assemble multiple battery cells into a battery cell module and connect the battery cell module to the support structure through a thermally conductive structural adhesive.

[0003] Since electric vehicles will encounter various complex working conditions during driving, in the existing battery packs, the support structure and the battery cell module may be debonded, resulting in the detachment of the battery cell module and affecting the use safety of the battery pack. Moreover, the existing support structure has the problem of insufficient structural strength. When being extruded at the bottom of the battery pack, the support structure may be crushed, which is not conducive to protecting the battery cell module and will also affect the overall use safety of the battery pack. Summary of the Utility Model

[0004] In view of this, the utility model aims to propose a support structure for a battery cell module to improve the use safety of the battery pack.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] It includes a support body provided at the bottom of the battery pack frame;

[0007] A first concave portion is provided at the top of the support body, and a second concave portion is provided at the bottom of the support body. The first concave portion and the second concave portion are both multiple and arranged at intervals in the width direction of the support body, and any one of the second concave portions corresponds to multiple first concave portions.

[0008] Further, the first concave portion includes a first groove provided at the top of the support body, and the second concave portion includes a second groove provided at the bottom of the support body; both the first groove and the second groove extend along the length direction of the support body.

[0009] Further, in the width direction of the support body, the ratio of the width dimension a of the first groove to the width dimension w of the support body is between 0.02 - 0.03, and the ratio of the depth dimension b of the first groove in the height direction of the support body to the width dimension a of the first groove is between 0.25 - 0.3; and / or,

[0010] In the width direction of the support body, the ratio between the spacing size c between two adjacent first grooves and the width size w of the support body is between 0.05 and 0.1.

[0011] Furthermore, a plurality of spaced-apart feet protruding downward are provided at the bottom of the support body, and a second groove is formed between two adjacent feet.

[0012] Furthermore, in the width direction of the support body, the ratio between the width size d of the second groove and the width size w of the support body is between 0.2 and 0.25.

[0013] Furthermore, a connecting plate is provided between two adjacent feet; and / or,

[0014] In the width direction of the support body, the ratio between the width size d of the second groove and the width size w of the support body is between 0.25 and 0.5.

[0015] Furthermore, the connecting plate is arranged in parallel with the support body, and the ratio between the spacing size f between the connecting plate and the support body and the height size h of the feet is between 0.02 and 0.03.

[0016] Furthermore, the thickness size t1 of the support body is between 1.5 and 2 mm; and / or, the thickness size t2 of the feet in the width direction of the support body is between 1.5 and 2 mm.

[0017] Compared with the prior art, the present utility model has the following advantages:

[0018] For the cell module support structure of the present utility model, by cooperatively arranging the first concave portion and the second concave portion, lightweight design can be achieved. At the same time, any second concave portion is arranged corresponding to a plurality of first concave portions, which can not only utilize the plurality of first concave portions to improve the connection strength between the support body and the cell module, but also ensure the structural strength of the support body through the asymmetric design of the quantity and arrangement position between the first concave portion and the second concave portion, thereby improving the overall use safety of the battery pack and facilitating the improvement of the product quality of the battery pack.

[0019] Secondly, the first concave portion includes a first groove provided at the top of the support body, and the second concave portion includes a second groove provided at the bottom of the support body. Both the first groove and the second groove are arranged to extend along the length direction of the support body. This not only has a simple structure and is conducive to manufacturing, but also can disperse stress when the support body is squeezed, ensuring the structural strength of the support body, and thus enhancing the support effect of the support body on the battery cell module. By setting the width dimension a and the depth dimension b of the first groove, it is possible to increase the glue storage space and the connection area between the heat-conducting structural adhesive and the support body without affecting the structural strength of the support body, thereby facilitating the improvement of the bonding strength and heat transfer efficiency of the battery cell module. At the same time, by setting the spacing dimension c between two adjacent first grooves, it is possible to ensure the rigidity and load-bearing capacity of the support body while providing sufficient glue storage space and connection area.

[0020] Furthermore, by providing a plurality of feet at the bottom of the support body, a role similar to that of a reinforcing rib can be formed, enhancing the structural stability of the support body, and making the second groove formed between two adjacent feet. The structure is simple, the layout is reasonable, and it is also convenient for design and implementation. By setting the width dimension d of the second groove, it is possible to enhance the lightweight design of the support body while ensuring the support ability of the support body, facilitating cost reduction. The setting of the connecting plate can further enhance the structural strength of the support body, prevent the support body from being crushed, and thus facilitate the beneficial effect of protecting the battery cell module.

[0021] Moreover, the connecting plate is arranged in parallel with the support body, and by setting the spacing dimension f between the connecting plate and the support body bracket, it is convenient to enhance the support ability of the support body, and at the same time, it can also achieve lightweight design and reduce manufacturing costs. By setting the thickness dimension t1 of the support body, it is possible to ensure sufficient structural strength while enhancing lightweight, and to provide sufficient space for groove arrangement. The setting of the thickness dimension t2 of the feet is conducive to the integral molding of the support body and ensures the structural strength of the support body.

[0022] Another object of the present utility model is to propose a battery pack, in which the battery cell module support structure as described above is provided.

[0023] Further, it further includes the battery pack frame, the support body provided at the bottom of the battery pack frame, and the battery cell module provided on the support body;

[0024] The battery cell module includes a plurality of battery cells arranged in sequence along the length direction of the support body, and each battery cell extends along the width direction of the support body to form the battery cell module;

[0025] The ratio range between the width dimension w of the support body and the length dimension L of the battery cell is between 0.2 and 0.3.

[0026] For the battery pack described in the present utility model, by adopting the above-mentioned cell module support structure, it helps to improve the connection strength between the support body and the cell module, as well as the protection effect on the cell module, and thus has good safety.

[0027] Furthermore, when the ratio range between the width dimension w of the support body and the length dimension L of the cell is between 0.2 and 0.3, it can ensure that the support body has sufficient structural strength while also leaving a clearance space for the explosion-proof valve at the bottom of the cell and achieving a lightweight design. Description of the Drawings

[0028] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0029] Figure 1 is the assembly drawing of the cell module support structure and the battery pack frame described in the embodiment of the present utility model;

[0030] Figure 2 is the structural schematic diagram of the cell module support structure described in the embodiment of the present utility model;

[0031] Figure 3 is Figure 2 the schematic diagram of the structure shown in another perspective;

[0032] Figure 4 is another structural schematic diagram of the cell module support structure described in the embodiment of the present utility model;

[0033] Figure 5 is Figure 4 the schematic diagram of the structure shown in another perspective;

[0034] Description of the Reference Numerals:

[0035] 1. Battery pack frame; 11. Bottom guard plate; 12. Front side beam; 13. Rear side beam; 14. Left side beam; 15. Right side beam; 16. Middle longitudinal beam; 17. Middle cross beam; 18. Installation cavity;

[0036] 2. Support body; 21. First concave part; 211. First groove; 22. Second concave part; 221. Second groove; 23. Support leg; 24. Connection plate;

[0037] w, width dimension of the support body; a, width dimension of the first groove; b, depth dimension of the first groove; c, spacing dimension between two adjacent first grooves; d, width dimension of the second groove; f, spacing dimension between the connecting plate and the support body; h, height dimension of the support leg; e, spacing dimension between the bottom of the support leg and the connecting plate; t1, thickness dimension of the support body; t2, thickness dimension of the support leg; r1, radius dimension of the outer chamfer of the support body; r2, radius dimension of the inner chamfer of the support body. Detailed implementation mode

[0038] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0039] In the description of the present invention, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, if terms such as "first" and "second" appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] Taking the battery pack mounting point structure described in the present invention as an example Figure 1 For the battery pack shown, the orientation terms such as "upper, lower, left, right, front, and back" used in the embodiment are based on Figure 1 the up-down direction (also known as the height direction, or the overall package Z direction), left-right direction (also known as the width direction, or the overall package Y direction), and front-back direction (also known as the length direction, or the overall package X direction) in the state shown. "Inner" and "outer" are defined based on the contour of the corresponding component. For example, "inner" and "outer" defined based on the contour of the battery pack, with the side where the middle crossbeam is located being "inner", and vice versa being "outer".

[0041] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific situations.

[0042] The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0043] Embodiment 1

[0044] This embodiment relates to a support structure for a battery cell module, which is conducive to solving the problems that the battery cell module and the support structure are prone to delamination in the prior art, and the support structure is prone to be crushed, so as to improve the use safety of the battery pack.

[0045] In terms of the overall structure, as Figures 1 to 5 shown, the support structure of the battery cell module in this embodiment includes a support body 2 provided at the bottom of the battery pack frame 1. Among them, a first concave portion 21 is provided at the top of the support body 2, and a second concave portion 22 is provided at the bottom of the support body 2. The first concave portion 21 and the second concave portion 22 are both multiple and arranged at intervals in the width direction of the support body 2, and any second concave portion 22 is arranged corresponding to multiple first concave portions 21.

[0046] At this time, with the above settings, by cooperating with the first concave portion 21 and the second concave portion 22, a lightweight design can be realized. At the same time, any second concave portion 22 is arranged corresponding to multiple first concave portions 21, which can not only improve the connection strength between the support body 2 and the battery cell module by using multiple first concave portions 21, but also ensure the structural strength of the support body 2 through the asymmetric design of the quantity and arrangement position between the first concave portion 21 and the second concave portion 22, thereby improving the overall use safety of the battery pack and thus being conducive to the improvement of the battery pack product quality.

[0047] It should be noted that Figure 1 the front-back direction shown in is the length direction of the support body 2, the left-right direction is the width direction of the support body 2, and the up-down direction is the height direction of the support body 2.

[0048] In addition, for the relevant structural parts not mentioned in this embodiment, the respective structures of the battery pack products well-known to those skilled in the art can be referred to. For example Figure 1 as shown in, at least two support bodies 2 are provided at intervals at the bottom of the battery pack frame 1 of this embodiment to form the main body part of the box body of the battery pack. In specific implementation, the box body mentioned in this embodiment further includes a bottom guard plate 11 provided at the bottom of the battery pack frame 1 and located below the support body 2, a front side beam 12 and a rear side beam 13 provided on the bottom guard plate 11, a left side beam 14 and a right side beam 15 connected between the front side beam 12 and the rear side beam 13, a middle longitudinal beam 16 provided on the bottom guard plate 11, and a middle cross beam 17 provided on the middle longitudinal beam 16, and the bottom guard plate 11 and each side beam enclose an installation cavity 18 for placing the battery cell module.

[0049] At the same time, in terms of the specific structure, both ends of each support body 2 are respectively connected to the front side beam 12 and the rear side beam 13, and the middle of each support body 2 is connected to the bottom of the middle cross beam 17.

[0050] Moreover, considering that too thin glue coating will lead to poor connection strength between the two, while too thick glue coating will cause problems such as glue layer cracking or peeling off. In this embodiment, as a preferred implementation form, in the height direction of the support body 2, a glue coating space of 0.5 - 1.5 mm is reserved between the support body 2 and the battery cell module. The specific value can be set to 1 mm. Thus, the relatively optimal bonding effect can be ensured.

[0051] It should still be noted that a bonding product well-known to those skilled in the art can be used between the battery cell module and the support body 2 in this embodiment, such as a thermally conductive structural adhesive. Of course, in addition to using a thermally conductive structural adhesive, other common bonding products can also be used.

[0052] Here, it should be pointed out that the number of the first concave portions 21 corresponding to any second concave portion 22 in this embodiment can be designed and adjusted according to actual needs. For example, it can be set to 3 or 7, etc., as long as it can improve the structural strength of the support body 2 while improving the lightweight property.

[0053] Based on the above overall introduction, in this embodiment, as a preferred implementation form, as Figure 2 and Figure 5 shown, the first concave portion 21 includes a first groove 211 provided at the top of the support body 2, the second concave portion 22 includes a second groove 221 provided at the bottom of the support body 2, and each first groove 211 and each second groove 221 extend along the length direction of the support body 2.

[0054] Thus, the first concave portion 21 includes a first groove 211 provided at the top of the support body 2, the second concave portion 22 includes a second groove 221 provided at the bottom of the support body 2, and the first groove 211 and the second groove 221 both extend along the length direction of the support body 2. This not only has a simple structure and is conducive to manufacturing, but also can disperse stress when the support body 2 is squeezed, ensure the structural strength of the support body 2, and further improve the support effect of the support body 2 on the battery cell module.

[0055] Specifically, in this embodiment, as a preferred implementation form, referring to Figure 3 shown, in the width direction of the support body 2, the ratio of the width dimension a of the first groove 211 to the width dimension w of the support body 2 is between 0.02 - 0.03, and the ratio of the depth dimension b of the first groove 211 in the height direction of the support body 2 to the width dimension a of the first groove 211 is between 0.25 - 0.3.

[0056] Here, by setting the width dimension a and the depth dimension b of the first groove 211, the glue storage space can be increased while not affecting the structural strength of the support body 2, and the connection area between the thermally conductive structural adhesive and the support body 2 can be increased, thereby facilitating the improvement of the bonding strength and heat transfer efficiency of the battery cell module.

[0057] Moreover, in the width direction of the support body 2, the ratio between the spacing dimension c between two adjacent first grooves 211 and the width dimension w of the support body 2 is between 0.05 and 0.1. The advantage of such a setting is that by setting the spacing dimension c between two adjacent first grooves 211, sufficient glue storage space and connection area can be provided while ensuring the rigidity and load-bearing capacity of the support body 2.

[0058] In addition, in this embodiment, as a preferred implementation form, continue to refer to Figure 3 As shown in, a plurality of feet 23 arranged at intervals and protruding downward are provided at the bottom of the support body 2, and a second groove 221 is formed between two adjacent feet 23.

[0059] Thus, by providing a plurality of feet 23 at the bottom of the support body 2, the function similar to that of a reinforcing rib can be formed to improve the structural stability of the support body 2, and the second groove 221 is formed between two adjacent feet 23, with a simple structure, reasonable layout, and being convenient for design and implementation.

[0060] Furthermore, as a preferred implementation form, as Figure 3 shown, in the width direction of the support body 2, the ratio between the width dimension d of the second groove 221 in this embodiment and the width dimension w of the support body 2 is between 0.2 and 0.25.

[0061] At the same time, it can be understood that setting the ratio of the width dimension d of the second groove 221 to the width dimension w of the support body 2 between 0.2 and 0.25, that is, setting the number of the second grooves 221 between 4 and 5. Thus, while ensuring the support ability of the support body 2, the lightweight design of the support body 2 can be improved, which is convenient for cost reduction.

[0062] Moreover, considering the protection requirements of the support body 2 for the battery cell module, in this embodiment, as a preferred implementation form, as Figure 4 and Figure 5 shown, a connecting plate 24 is provided between two adjacent feet 23, and, in the width direction of the support body 2, the ratio between the width dimension d of the second groove 221 and the width dimension w of the support body 2 is between 0.25 and 0.5.

[0063] Here, by setting the connecting plate 24, the structural strength of the support body 2 can be further improved, preventing the support body 2 from being crushed, so as to enhance the beneficial effect of protecting the battery cell module. At the same time, setting the ratio between the width dimension d of the second groove 221 and the width dimension w of the support body 2 between 0.25 and 0.5, that is, the number of the second grooves 221 can be set between 2 and 4 at this time, which can improve the structural strength of the support body 2 while making the overall structure lighter, thus ensuring a balance between strength and weight reduction.

[0064] Moreover, in this embodiment, as a preferred implementation form, continue to refer to Figure 5 as shown in, the connecting plate 24 and the support body 2 are arranged in parallel, and the ratio between the spacing dimension f between the connecting plate 24 and the support body 2 and the height dimension h of the support leg 23 is between 0.02 and 0.03.

[0065] By arranging the connecting plate 24 and the support body 2 in parallel and setting the spacing dimension f between the connecting plate 24 and the support body 2, it is convenient to improve the supporting ability of the support body 2, and at the same time, lightweight design can be realized, reducing the manufacturing cost.

[0066] During specific implementation, the spacing dimension e between the bottom of the support leg 23 and the connecting plate 24 is equal to the spacing dimension f between the connecting plate 24 and the support body 2. Thus, the supporting effect of the support body 2 can be improved, and the structure is simple and compact, which is beneficial to realizing lightweight design.

[0067] In addition, in this embodiment, as a preferred implementation form, as Figure 3 and Figure 5 shown, the thickness dimension t1 of the support body 2 is between 1.5 and 2 mm, and the thickness dimension t2 of the support leg 23 in the width direction of the support body 2 is between 1.5 and 2 mm.

[0068] Therefore, by setting the thickness dimension t1 of the support body 2, while ensuring sufficient structural strength, weight reduction can be improved, and enough space can be provided for groove arrangement. The setting of the thickness dimension t2 of the support leg 23 is beneficial to the integral molding of the support body 2 and ensures the structural strength of the support body 2.

[0069] In terms of specific structure, to avoid stress concentration at the corner of the support body 2, chamfering needs to be carried out. At this time, the ratios of the radius dimension r1 of the outer chamfer of the support body 2, the radius dimension r2 of the inner chamfer of the support body 2 to the thickness dimension t1 of the support body 2 are all between 0.6 and 0.7. The specific ratio can be designed and adjusted according to the actual situation. For example, it can be set to 0.5. As long as stress concentration can be avoided.

[0070] In summary, the cell module support structure of this embodiment is designed as above. By opening a plurality of first grooves 211 at the top of the support body 2, opening a plurality of second grooves 221 at the bottom of the support body 2, and making any one of the second grooves 221 correspond to a plurality of first grooves 211, it can not only improve the connection strength between the support body 2 and the cell module by using the plurality of first grooves 211, but also improve the structural strength of the support body 2 and the lightweight design through the asymmetric design between the first grooves 211 and the second grooves 221, thereby improving the overall safety of the battery pack during use.

[0071] Embodiment 2

[0072] This embodiment relates to a battery pack, including the cell module support structure in Embodiment 1.

[0073] In addition, as a preferred implementation form, still in combination with Figure 1 as shown in, the battery pack of this embodiment includes a battery pack frame 1, a support body 2 provided at the bottom of the battery pack frame 1, and a cell module provided on the support body 2.

[0074] Among them, the cell module includes a plurality of cells arranged in sequence along the length direction of the support body 2, and each cell extends along the width direction of the support body 2 to form a cell module. Moreover, the ratio range between the width dimension w of the support body 2 and the length dimension L of the cell is between 0.2 and 0.3.

[0075] At this time, it can be understood that by setting the ratio range between the width dimension w of the support body 2 and the length dimension L of the cell between 0.2 and 0.3, it is possible to ensure that the support body 2 has sufficient structural strength while leaving a clearance space for the explosion-proof valve at the bottom of the cell and achieving lightweight design.

[0076] The battery pack of this embodiment, by adopting the cell module support structure in Embodiment 1, helps to improve the connection strength between the support body 2 and the cell module and the protection effect on the cell module, and thus has good safety.

[0077] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A support structure for a battery cell module, characterized in that: It includes a support body provided at the bottom of the battery pack frame; A first concave portion is provided at the top of the support body, and a second concave portion is provided at the bottom of the support body. Both the first concave portion and the second concave portion are multiple and arranged at intervals in the width direction of the support body, and any one of the second concave portions is provided corresponding to multiple first concave portions.

2. The support structure for a battery cell module according to claim 1, characterized in that: The first concave portion includes a first groove provided at the top of the support body, and the second concave portion includes a second groove provided at the bottom of the support body; Both the first groove and the second groove extend and are arranged along the length direction of the support body.

3. The support structure for a battery cell module according to claim 2, characterized in that: In the width direction of the support body, the ratio between the width dimension a of the first groove and the width dimension w of the support body is between 0.02 - 0.03, and the ratio between the depth dimension b of the first groove in the height direction of the support body and the width dimension a of the first groove is between 0.25 - 0.3; and / or, In the width direction of the support body, the ratio between the spacing dimension c between two adjacent first grooves and the width dimension w of the support body is between 0.05 - 0.

1.

4. The support structure for a battery cell module according to claim 2, characterized in that: A plurality of spaced - apart feet protruding downward are provided at the bottom of the support body, and the second groove is formed between two adjacent feet.

5. The support structure for a battery cell module according to claim 4, characterized in that: In the width direction of the support body, the ratio between the width dimension d of the second groove and the width dimension w of the support body is between 0.2 - 0.

25.

6. The support structure for a battery cell module according to claim 4, characterized in that: A connecting plate is provided between two adjacent feet; and / or, In the width direction of the support body, the ratio between the width dimension d of the second groove and the width dimension w of the support body is between 0.25 - 0.

5.

7. The support structure for a battery cell module according to claim 6, characterized in that: The connecting plate and the support body are arranged in parallel, and the ratio between the spacing dimension f between the connecting plate and the support body and the height dimension h of the feet is between 0.02 - 0.

03.

8. The support structure for a battery cell module according to claim 4, characterized in that: The thickness dimension t1 of the support body is between 1.5 and 2 mm; and / or, The thickness dimension t2 of the feet in the width direction of the support body is between 1.5 and 2 mm.

9. A battery pack, characterized in that: It includes the support structure for a battery cell module according to any one of claims 1 to 8.

10. The battery pack according to claim 9, characterized in that: It includes the battery pack frame, the support body provided at the bottom of the battery pack frame, and the battery cell module provided on the support body. The battery cell module includes a plurality of battery cells arranged in sequence along the length direction of the support body, and each of the battery cells extends along the width direction of the support body to form the battery cell module; The ratio range between the width dimension w of the support body and the length dimension L of the battery cell is between 0.2 and 0.3.

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