Battery pack

Abstract

The utility model provides a battery pack which comprises a shell body, a battery cell module and a buffer part, the battery cell module and the buffer part are arranged in the shell body, the buffer part is arranged between the side part of the battery cell module and the shell body, and the buffer part is connected with the top and the bottom of the shell body. According to the battery pack disclosed by the utility model, through the arrangement of the buffer component, when side collision occurs, the buffer component can absorb collision energy and reduce energy transmission, compared with the mode of increasing the wall thickness or additionally arranging reinforcing ribs in the traditional technology, the weight of the battery pack can be reduced on the premise of ensuring the collision safety, and meanwhile, the battery pack is convenient to assemble and disassemble. And compared with a gap increasing mode, the energy density can be improved.

Description

Technical Field

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

[0002] With the development of the new energy vehicle industry, the safety protection of battery packs is an important aspect of improving the safety of new energy vehicles. Since the battery pack is usually located under the vehicle chassis, it is very easy to be damaged, cause fire, or even explode in the event of a collision. Therefore, how to achieve effective collision protection for the battery pack has become an important technical research and development issue for new energy vehicles.

[0003] At present, battery packs usually adopt methods such as increasing the shell wall thickness or designing additional reinforcing ribs to improve structural strength, or increasing the gap between the battery module and the box to reduce the intrusion amount to enhance side impact protection. However, these protection methods have the problem of excessive battery pack weight or low energy density. Utility Model Content

[0004] In view of this, the utility model aims to provide a battery pack with better side impact protection effect.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A battery pack comprises a shell body, and a battery cell module and a buffer component arranged in the shell body;

[0007] The buffer component is arranged between the side of the battery core module and the shell body, and the buffer component is connected to the top and the bottom of the shell body.

[0008] Furthermore, the shell body includes a lower shell and an upper shell that are snap-fitted together; the buffer component includes a buffer member, the top of the buffer member is connected to the upper shell, and the bottom of the buffer member is connected to the lower shell.

[0009] Furthermore, the buffer component includes a fixing bracket arranged on the lower shell; the bottom of the buffer component is clamped on the fixing bracket, and the top of the buffer component is glued to the upper shell.

[0010] Furthermore, the buffer component is made of EPP material.

[0011] Furthermore, in the height direction, the fixing bracket is snapped into the snap-in groove at the bottom of the buffer component.

[0012] Furthermore, the top of the fixing bracket is connected to the snap-in groove via an adhesive layer; and / or the snap-in grooves are multiple and spaced apart along the extending direction of the buffer, and one fixing bracket is snap-into each of the snap-in grooves.

[0013] Furthermore, the fixing bracket includes a first vertical plate connected to the lower shell, a second vertical plate connected to the first vertical plate via a first connecting plate, the second vertical plate is located on a side of the first vertical plate facing the lower shell, and the second vertical plate is spaced apart from the lower shell.

[0014] Furthermore, the buffer member includes a main body, and a first blocking portion and a second blocking portion arranged at the bottom of the main body, the clamping groove is formed between the first blocking portion and the second blocking portion, and the first blocking portion and the second blocking portion are spaced apart from the lower shell.

[0015] Furthermore, the spacing between the first blocking portion and the lower shell, and between the second blocking portion and the lower shell is between 5 and 10 mm; and / or, a second connecting plate is attached to the inner wall of the lower shell, and the first vertical plate is connected to the lower shell through the second connecting plate.

[0016] Furthermore, the fixing bracket is connected to the lower shell by welding, riveting or screwing; and / or the lower shell includes a lower flange edge connected to the upper shell, and the size difference between the top of the fixing bracket and the lower flange edge in the height direction is between 10 and 30 mm.

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

[0018] The battery pack described in the utility model, through the provision of a buffer component, can absorb collision energy and reduce energy transfer when a side collision occurs. Compared with the traditional technology of increasing wall thickness or adding reinforcing ribs, it can help reduce the weight of the battery pack while ensuring collision safety. At the same time, compared with the method of increasing the gap, it can help improve energy density.

[0019] In addition, the buffer is fixed to the lower shell through a fixing bracket, and the buffer is connected to the fixing bracket through a snap-in groove, which ensures the fixing effect of the buffer and facilitates the assembly of the buffer. The buffer is made of EPP, which has a certain collapse energy absorption effect, can effectively improve the safety performance of the battery pack, and reduce the overall weight of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of the battery pack according to an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the buffer component according to an embodiment of the utility model;

[0023] Figure 3 A top view of a battery pack according to an embodiment of the present utility model;

[0024] Figure 4 For the utility model Figure 3 The cross-section at the position indicated by AA;

[0025] Description of reference numerals:

[0026] 1. Lower shell; 2. Upper shell; 3. Buffer; 4. Fixed bracket; 5. Snap-in groove; 6. Structural adhesive;

[0027] 31. Main body; 32. First blocking portion; 33. Second blocking portion;

[0028] 41. First vertical plate; 42. First connecting plate; 43. Second vertical plate; 44. Second connecting plate. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are 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 limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] Taking the vehicle in which the battery pack described in the utility model is located as an example, the directional words used in the embodiments, such as "up, down, left, right, front, and back", are defined based on the up and down direction (also known as the height direction, or the Z direction of the whole vehicle), the left and right direction (also known as the width direction, or the Y direction of the whole vehicle), and the front and rear direction (also known as the length direction, or the X direction of the whole vehicle). "Inside and outside" are defined based on the contour of the corresponding parts. For example, "inside" and "outside" are defined based on the contour of the vehicle, and the side of the vehicle contour close to the middle of the vehicle is "inside", and the opposite is "outside".

[0032] 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0034] This embodiment relates to a battery pack, which has an overall structure and Figure 1 As shown, the battery pack of this embodiment includes a shell body, a battery cell module and a buffer component arranged in the shell body. The buffer component is arranged between the side of the battery cell module and the shell body, and the buffer component is connected to the top and bottom of the shell body.

[0035] As shown in the above structure, the battery pack of this embodiment, through the provision of a buffer component, can absorb collision energy and reduce energy transfer when a side collision occurs. Compared with the traditional technology of increasing wall thickness or adding reinforcing ribs, it can help reduce the weight of the battery pack while ensuring collision safety. At the same time, compared with the method of increasing the gap, it can help improve energy density and has good practicality.

[0036] Based on the above overall introduction, specifically, in this embodiment, the battery cell module is arranged in the middle of the shell body, the buffer component is arranged on the side of the battery cell module, and is located between the battery cell module and the shell body, that is, the buffer component can be arranged circumferentially of the battery cell module, and of course, it can also be arranged on one side or both sides of the battery cell module according to the overall buffering requirements of the battery pack.

[0037] As a preferred implementation form, combined with Figure 1 and Figure 4As shown, the shell body includes a lower shell 1 and an upper shell 2 that are snap-fitted together, and the buffer component includes a buffer member 3. The top of the buffer member 3 is connected to the upper shell 2, and the bottom of the buffer member 3 is connected to the lower shell 1. By connecting the buffer member 3 to the upper shell 2 and the lower shell 1, it can have good structural stability and can improve the safety performance of the battery pack.

[0038] In the specific implementation, there is a certain gap between the buffer 3 and the upper shell 2 and the lower shell 1, which can ensure that the buffer 3 will not interfere with the upper shell 2 and the lower shell 1 during the assembly of the buffer 3, and there is a certain gap between the buffer 3 and the battery module, which is beneficial to protecting the battery module in case of collision.

[0039] Furthermore, in order to ensure that the gap can be beneficial to protecting the battery cell module while ensuring that the battery pack has a high energy density, specifically, the gap size between the buffer 3 and the battery cell module can be preferably set to 20 mm, 25 mm or 30 mm.

[0040] As a preferred implementation form, combined with Figure 2 and Figure 4 As shown, the buffer component of this embodiment includes a fixed bracket 4 arranged on the lower shell 1, the bottom of the buffer component 3 is clamped on the fixed bracket 4, and the top of the buffer component 3 is glued to the upper shell 2, which can be used to adjust the tolerance between the upper shell 2 and the buffer component 3 in the height direction.

[0041] It can be understood that the buffer member 3 is clamped on the lower shell 1 through the fixing bracket 4, so that the connection structure is simple and has a good fixing effect. At the same time, during the production process of the battery pack, the setting of the fixing bracket 4 can facilitate the assembly of the buffer member 3.

[0042] In specific implementation, the top of the buffer 3 can be coated with an adhesive material known to those skilled in the art, such as structural adhesive, etc. At the same time, in order to ensure the adjustment effect of the tolerance between the upper shell 2 and the buffer 3, the design thickness of the structural adhesive 6 can be preferably set to 2 mm.

[0043] As a preferred implementation form, the buffer 3 in this embodiment is made of EPP (Expanded Polypropylene, polypropylene foam) material, which can take advantage of the low density, small mass, compressibility and deformability of EPP, which is not only conducive to reducing the overall weight of the battery pack, but also enables the buffer 3 to absorb the collision energy by deformation during a collision, thereby improving the protection effect on the battery module. In addition, the cost of EPP is relatively low, which can reduce the production cost of the battery pack.

[0044] In this embodiment, as a preferred implementation form, combined with Figure 2 and Figure 4As shown, in the height direction, the fixing bracket 4 is inserted into the clamping groove 5 at the bottom of the buffer 3, and the top of the fixing bracket 4 is connected to the clamping groove 5 through an adhesive layer to improve the connection stability between the two.

[0045] At the same time, as a preferred implementation form, the clamping grooves 5 of this embodiment are arranged in a plurality of intervals along the extension direction of the buffer 3, and a fixing bracket 4 is clamped in each clamping groove 5. By providing a plurality of clamping grooves 5 connected with a plurality of fixing brackets 4, the buffer 3 can be effectively fixed, with a good fixing effect.

[0046] In a specific implementation, the bottom of the snap-in slot 5 fits tightly with the top surface of the fixing bracket 4, and the number and specific size settings of the snap-in slot 5 and the fixing bracket 4 of this embodiment can be set and adjusted accordingly according to the connection stability requirements between the buffer 3 and the lower shell 1. For example, the fixing bracket 4 and the snap-in slot 5 are preferably set to 6.

[0047] Furthermore, in the front-to-back direction (i.e., the length direction), the width of the snap-in slot 5 is greater than the width of the fixed bracket 4. Specifically, the width of the fixed bracket 4 can be preferably set to 42 mm. At the same time, each snap-in slot 5 can be preferably set to be symmetrically arranged in the middle of the buffer 3, and in the front-to-back direction, the width dimensions of each snap-in slot 5 are preferably set to 79 mm, 120 mm, 145 mm, 145 mm, 120 mm, and 79 mm, respectively.

[0048] Such a symmetrical arrangement can improve the assembly compatibility of the buffer 3 at different positions in the bag, or combined with the variation of the width dimension, can improve the dimensional tolerance between each snap-in slot 5 and the corresponding fixing bracket 4, and avoid assembly interference.

[0049] That is, when the position of one of the fixing brackets 4 is offset, based on the wide size design of the clamping groove 5, a better clamping connection between the two can be achieved.

[0050] As a preferred implementation form, combined with Figure 4 As shown, the fixing bracket 4 of this embodiment includes a first vertical plate 41 connected to the lower shell 1, a second vertical plate 43 connected to the first vertical plate 41 through a first connecting plate 42, the second vertical plate 43 is located on the side of the first vertical plate 41 facing the lower shell 1, and the second vertical plate 43 is spaced apart from the lower shell 1. Thus, the structure of the fixing bracket 4 is simple, which can facilitate the assembly of the buffer 3.

[0051] In addition, in the specific implementation, the first vertical plate 41 and the second vertical plate 43 are tightly fitted with the inner wall of the snap-in groove 5 so that the snap-in groove 5 and the fixed bracket 4 have an interference fit, and the top of the fixed bracket 4, that is, the upper surface of the first connecting plate 42 is coated with an adhesive layer, so that the top of the fixed bracket 4 is bonded to the snap-in groove 5 through the adhesive layer, thereby ensuring the connection stability between the buffer 3 and the fixed bracket 4.

[0052] The adhesive layer of this embodiment can be made of adhesive materials known to those skilled in the art, such as double-sided adhesive tape, and it is sufficient to ensure that the fixing bracket 4 and the clamping groove 5 can be firmly bonded together. At the same time, in order to ensure the bonding effect, the coating thickness of the adhesive layer can be preferably set to 0.1 mm.

[0053] As a preferred implementation form, combined with Figure 4 As shown, the buffer member 3 of this embodiment includes a main body 31, and a first blocking portion 32 and a second blocking portion 33 arranged at the bottom of the main body 31, a snap-in groove 5 is formed between the first blocking portion 32 and the second blocking portion 33, and the first blocking portion 32 and the second blocking portion 33 are spaced apart from the lower shell 1.

[0054] Here, the first stopper 32 and the second stopper 33 form a clamping groove 5 , the first vertical plate 41 of the fixing bracket 4 is close to the first stopper 32 , and the second vertical plate 43 is close to the second stopper 33 , so as to ensure the stability of the buffer 3 fixed by the fixing bracket 4 .

[0055] In addition, a certain distance is reserved between the first blocking portion 32 and the second blocking portion 33 and the lower shell 1 , so that during the assembly process, the first blocking portion 32 and the second blocking portion 33 will not interfere with the lower shell 1 , thereby improving the assembly performance of the buffer 3 .

[0056] As a preferred implementation form, continue to combine Figure 4 As shown, in this embodiment, the spacing between the first blocking portion 32 and the lower housing 1 , and between the second blocking portion 33 and the lower housing 1 is between 5 and 10 mm.

[0057] It is understandable that the evenly spaced arrangement between the first blocking portion 32 and the second blocking portion 33 and the lower shell 1 can not only improve the assembly of the buffer 3, but also reduce the intrusion of the shell body during a collision to a certain extent, thereby improving the protection effect on the battery module.

[0058] In a specific implementation, the spacing between the first blocking portion 32 and the lower shell 1 , and between the second blocking portion 33 and the lower shell 1 can be preferably set to 6 mm, 8 mm and 10 mm.

[0059] In addition, as a preferred implementation form, in this embodiment, a second connecting plate 44 is attached to the inner wall of the lower shell 1, and the first vertical plate 41 is connected to the lower shell 1 through the second connecting plate 44 to improve the stability of the connection between the fixing bracket 4 and the lower shell 1.

[0060] In this embodiment, as a preferred implementation form, the fixing bracket 4 is specifically connected to the lower shell 1 by welding, riveting or screwing through the second connecting plate 44 to improve the connection stability of the fixing bracket 4.

[0061] It can be understood that when the fixed bracket 4 (or the second connecting plate 44) is made of metal material, the fixed bracket 4 and the lower shell 1 can preferably be connected by welding, so as to improve the connection stability of the fixed bracket 4. When the fixed bracket 4 (or the second connecting plate 44) is made of non-metallic material, it can preferably be connected to the fixed bracket 4 by riveting and screwing to ensure the connection stability between different materials.

[0062] In addition, as a preferred embodiment, the lower shell 1 includes a lower flange edge connected to the upper shell 2, and the size difference between the top of the fixed bracket 4 (that is, the first connecting plate 42) and the lower flange edge in the height direction (Z direction) is between 10 and 30 mm, which can facilitate the assembly of the buffer 3.

[0063] During specific implementation, in the height direction, the height dimension of the top of the fixed bracket 4 of this embodiment (that is, the first connecting plate 42) is preferably not more than the height dimension of the lower flange edge of the lower shell 1, and the height dimension difference between the top of the fixed bracket 4 and the lower flange edge in the height direction can be preferably set to 15mm, 20mm and 25mm, so as to ensure that the buffer 3 can be effectively fixed while improving the assembly convenience of the buffer 3.

[0064] The battery pack of this embodiment, through the provision of a buffer component, can absorb collision energy and reduce energy transfer when a side collision occurs. Compared with the traditional technology of increasing wall thickness or adding reinforcing ribs, it can help reduce the weight of the battery pack while ensuring collision safety. At the same time, compared with the method of increasing the gap, it can help improve energy density and has good practicality.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: It includes a shell body, and a battery core module and a buffer component arranged in the shell body; The buffer component is arranged between the side of the battery core module and the shell body, and the buffer component is connected to the top and the bottom of the shell body.

2. The battery pack according to claim 1, characterized in that: The shell body comprises a lower shell and an upper shell which are connected by buckling; The buffer component includes a buffer member, a top of the buffer member is connected to the upper shell, and a bottom of the buffer member is connected to the lower shell.

3. The battery pack according to claim 2, characterized in that: The buffer component includes a fixing bracket arranged on the lower shell; The bottom of the buffer component is clamped on the fixing bracket, and the top of the buffer component is glued and connected to the upper shell.

4. The battery pack according to claim 3, characterized in that: The buffer is made of EPP material.

5. The battery pack according to claim 4, characterized in that: In the height direction, the fixing bracket is clamped into the clamping groove at the bottom of the buffer component.

6. The battery pack according to claim 5, characterized in that: The top of the fixing bracket is connected to the clamping groove via an adhesive layer; and / or, The clamping grooves are multiple and arranged at intervals along the extending direction of the buffer component, and one of the fixing brackets is clamped in each of the clamping grooves.

7. The battery pack according to claim 5, characterized in that: The fixing bracket includes a first vertical plate connected to the lower shell, a second vertical plate connected to the first vertical plate via a first connecting plate, the second vertical plate is located on a side of the first vertical plate facing the lower shell, and the second vertical plate is spaced apart from the lower shell.

8. The battery pack according to claim 7, characterized in that: The buffer member includes a main body, and a first blocking portion and a second blocking portion arranged at the bottom of the main body, the clamping groove is formed between the first blocking portion and the second blocking portion, and the first blocking portion and the second blocking portion are spaced apart from the lower shell.

9. The battery pack according to claim 8, characterized in that: The distance between the first blocking portion and the lower shell, and the distance between the second blocking portion and the lower shell are between 5 and 10 mm; and / or, A second connecting plate is attached to the inner side wall of the lower shell, and the first vertical plate is connected to the lower shell through the second connecting plate.

10. The battery pack according to any one of claims 3 to 9, characterized in that: The fixing bracket is connected to the lower shell by welding, riveting or screwing; and / or, The lower shell includes a lower flange edge connected to the upper shell, and the size difference between the top of the fixing bracket and the lower flange edge in the height direction is between 10 and 30 mm.

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