Battery cell fixing structure, battery pack and automobile

Abstract

The utility model relates to the technical field of automobile parts, specifically relates to a kind of electric core fixed structure, battery pack and car, and the electric core fixed structure includes electric core, crossbeam and pultrusion beam;Electric core is fixed in the lower box body of battery pack, and crossbeam is equipped between adjacent electric core;The upper surface of pultrusion beam is higher than the upper surface of electric core shoulder, and the both ends of pultrusion beam are connected with the shoulder of electric core on both sides respectively, and pultrusion beam is also connected with crossbeam by fixing part.The electric core fixed structure, battery pack and car provided by the utility model avoid the situation that the edge is produced by the existing pressing plate fixed, can guarantee the connecting strength between pultrusion beam and crossbeam, after being fixed by fixing part, the time that structure adhesive solidifies in traditional pressing plate fixed mode is saved, and production efficiency is significantly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of auto parts, in particular to a cell fixing structure, a battery pack and an automobile. Background Art

[0002] With the continuous development of the new energy automobile industry, the reliability and energy density of battery packs have always been the core indicators in battery pack development. However, the reliability and energy density of battery packs contradict each other, and how to improve the reliability of battery packs on the basis of ensuring the energy density of battery packs has always been a difficult problem.

[0003] An important indicator of battery pack reliability is the modal of the battery pack. At present, the improvement of battery pack modal is mainly achieved by means of pressing plate fixation, that is, gluing on the cross beam of battery cells, and then fixing the pressing plate on the cross beam by gluing. However, the problem that both sides of the pressing plate tilt up easily occurs during installation on the production line, and it also takes time for the glue to cure, which seriously affects the production efficiency of the production line. Utility model Content

[0004] (1) The technical problem solved by the utility model is: when the pressing plate is fixed on the cross beam by gluing, the technical problems that both sides of the pressing plate tilt easily, and the glue curing requires time thus affecting the production efficiency of the production line.

[0005] (2) Technical solution To solve the above technical problem, an embodiment of the present utility model provides a cell fixing structure, comprising a cell, a cross beam and a pultruded beam; The cells are fixedly arranged in the lower box of the battery pack, and the cross beam is arranged between adjacent cells; The upper surface of the pultruded beam is higher than the upper surface of the cell shoulders, two ends of the pultruded beam are respectively connected with the shoulders of the cells on both sides, and the pultruded beam is further connected with the cross beam by a fixing member.

[0006] Further, the pultruded beam comprises a beam body and oppositely arranged hanging lugs; The hanging lugs are respectively arranged on both sides of the top wall of the beam body, the lower bottom surface of the hanging lug is connected with the upper surface of the shoulder of the cell, and the fixing member passes through the beam body and the cross beam to fix the pultruded beam and the cross beam.

[0007] Further, the fixing member is a bolt, a plurality of mounting holes are spaced apart along the length direction of the beam body, a nut is arranged at a position of the cross beam corresponding to each mounting hole, and the bolt passes through the mounting hole and is in threaded fit with the nut.

[0008] Further, the cross section of the beam body is grid-shaped.

[0009] Furthermore, the upper surface of the shoulder of the battery cell is provided with a limiting strip, which encloses to form a connection area, and the hanging ear is connected to the connection area.

[0010] Furthermore, the connection area is coated with structural adhesive.

[0011] Furthermore, the beam has a first base plate, a second base plate, and a third base plate, with the first base plate located above the second base plate and the second base plate located above the third base plate. The first base plate, the second base plate, and the third base plate are all provided with mounting holes.

[0012] Furthermore, the diameter of the mounting hole in the first base plate is larger than the diameter of the mounting hole in the second base plate, and the diameter of the mounting hole in the second base plate is larger than the diameter of the mounting hole in the third base plate.

[0013] An embodiment of this utility model also provides a battery pack, including the above-described cell fixing structure.

[0014] An embodiment of this utility model also provides an automobile, including the battery pack described above.

[0015] The beneficial effects of this utility model are: This utility model provides a battery cell fixing structure, including a battery cell, a crossbeam, and a pultruded beam. The battery cell is directly fixed in the lower casing of the battery pack, and a crossbeam is provided between adjacent battery cells. The two ends of the pultruded beam are respectively connected to the shoulders of the battery cells on both sides, so that the battery cells on both sides of the crossbeam form a whole, which can significantly improve the overall mode. Furthermore, the pultruded beam is also connected to the crossbeam through a fixing component. The upper surface of the pultruded beam is higher than the upper surface of the shoulder of the battery cell, thereby avoiding the warping that occurs when fixing with a pressure plate. This ensures the connection strength between the pultruded beam and the crossbeam. After fixing with a fixing component, the time for waiting for the structural adhesive to cure in the traditional pressure plate fixing method is eliminated, which significantly improves production efficiency.

[0016] This utility model provides a battery pack including the above-mentioned cell fixing structure. By using the above-mentioned cell fixing structure, the warping of adjacent cells caused by fixing with pressure plates in traditional battery packs is avoided. It can ensure the connection strength between the pultruded beam and the crossbeam. At the same time, since the fixing parts are provided for cooperation and fixing, the time of waiting for the structural adhesive to cure in the traditional pressure plate fixing method is eliminated, which significantly improves production efficiency.

[0017] This utility model provides an automobile that includes the aforementioned battery pack, thereby avoiding the problem of adjacent cells warping due to pressure plates being fixed in traditional battery packs during automobile production. Furthermore, the presence of fixing components eliminates the need for waiting for structural adhesive to cure in traditional pressure plate fixing methods, thus significantly improving the overall vehicle production efficiency. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a front view of the battery cell fixing structure provided in an embodiment of the present utility model; Figure 2 A top view of the battery cell fixing structure provided in an embodiment of this utility model; Figure 3 A schematic diagram of the pultruded beam structure of the cell fixing structure provided in this embodiment of the utility model; Figure 4 A side view of the pultruded beam structure of the battery cell fixing structure provided in an embodiment of this utility model.

[0020] icon: 100 - Battery cell; 101 - Crossbeam; 200 - Pultruded beam; 201 - Beam body; 2011 - First base plate; 2012 - Second base plate; 2013 - Third base plate; 202 - Lug; 203 - Mounting hole; 300 - Fastener. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] Example 1 like Figures 1 to 4 As shown, this utility model provides a battery cell fixing structure, including a battery cell 100, a crossbeam 101, and a pultruded beam 200; The battery cell 100 is fixed in the lower housing of the battery pack, and a crossbeam 101 is provided between adjacent battery cells 100; The upper surface of the pultruded beam 200 is higher than the upper surface of the shoulder of the battery cell 100, and the two ends of the pultruded beam 200 are respectively connected to the shoulders of the battery cells 100 on both sides. The pultruded beam 200 is also connected to the crossbeam 101 through the fastener 300.

[0025] In this embodiment, the cell fixing structure includes a cell 100, a crossbeam 101, and a pultruded beam 200. The cell 100 is directly fixed in the lower casing of the battery pack, and a crossbeam 101 is provided between adjacent cells 100. The two ends of the pultruded beam 200 are respectively connected to the shoulders of the cells 100 on both sides, so that the cells 100 on both sides of the crossbeam 101 form a whole, which can significantly improve the overall mode. The pultruded beam 200 is also connected to the crossbeam 101 through a fastener 300. The upper surface of the pultruded beam 200 is higher than the upper surface of the shoulder of the cell 100, thereby avoiding the warping that occurs when fixing with a pressure plate. This ensures the connection strength between the pultruded beam 200 and the crossbeam 101. After fixing with the fastener 300, the time for waiting for the structural adhesive to cure in the traditional pressure plate fixing method is eliminated, which significantly improves production efficiency.

[0026] According to one embodiment provided by this utility model, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the pultruded beam 200 includes a beam body 201 and oppositely arranged lugs 202; The beam 201 has two hanging ears 202 on both sides of the top wall. The bottom surface of the hanging ear 202 is connected to the upper surface of the shoulder of the battery cell 100. The fastener 300 passes through the beam 201 and the crossbeam 101 to fix the pultruded beam 200 and the crossbeam 101.

[0027] In this embodiment, in order to ensure the fixing effect of the pultruded beam 200, the pultruded beam 200 is configured to include a beam body 201 and oppositely arranged hanging lugs 202, that is, hanging lugs 202 are respectively provided on both sides of the top wall of the beam body 201. Therefore, when the two ends of the pultruded beam 200 are respectively connected to the shoulders of the battery cells 100 on both sides, the lower bottom surface of the hanging lug 202 fits with the upper surface of the shoulder of the battery cell 100. At this time, the fixing member 300 passes through the beam body 201 and the cross beam 101 to fix the pultruded beam 200 and the cross beam 101, which further enables the beam body 201 to be closer to the cross beam 101, facilitating fixed connection therebetween and improving production efficiency.

[0028] According to an embodiment provided by the present utility model, as Figure 1 , Figure 2 and Figure 3 shown, the fixing member 300 is a bolt, a plurality of mounting holes 203 are spaced along the length direction of the beam body 201, nuts are provided at positions of the cross beam 101 corresponding to each mounting hole 203, and the bolt passes through the mounting hole 203 to form threaded fit with the nut.

[0029] In this embodiment, the cross beam 101 is a part of the lower case of the battery pack, and can be made of steel or aluminum structure. Preferably, the fixing member 300 is a bolt, and a plurality of mounting holes 203 are spaced along the length direction of the beam body 201. In order to cooperate with the bolt and the mounting hole 203 for fixation, a plurality of nuts are pre-arranged on the cross beam 101, and each nut corresponds to one mounting hole 203. Therefore, the bolt can form threaded fit with the nut after passing through the mounting hole 203, so as to ensure the connection strength between the beam body 201 and the cross beam 101. The next production process can be carried out without waiting for the structural adhesive coated on the upper surface of the shoulders of the hanging lug 202 and the battery cell 100 to solidify, thereby significantly improving production efficiency and effectively reducing the time cost in the production process.

[0030] According to an embodiment provided by the present utility model, as Figure 4 shown, the cross-section of the beam body 201 is in a grid shape like the Chinese character "mu".

[0031] In this embodiment, preferably, the cross-section of the beam body 201 is arranged in the grid shape of Chinese character "mu", and the pultruded beam 200 is made of composite material, which can utilize the insulating property of the composite material. High and low voltage wiring harnesses are arranged in independent spaces formed by the grid separation, which can not only reuse the space of the battery pack, but also play an insulation protection role for the high and low voltage wiring harnesses.

[0032] According to an embodiment provided by the present utility model, a limit strip is provided on the upper surface of the shoulder of the battery cell 100, the limit strip encloses a connection area, and the hanging lug 202 is connected to the connection area.

[0033] Further, structural adhesive is coated in the connection area.

[0034] In this embodiment, a limiting strip is affixed in advance to the contact position between the shoulder of the battery cell 100 and the lug 202 of the pultruded beam 200. The limiting strip encloses and forms a connection area, so that the lug 202 can be accurately and fixedly connected to the connection area.

[0035] To ensure the stability of the connection between the lugs 202 and the connecting beam of the pultruded beam 200, structural adhesive is applied to the connection area. After the structural adhesive is applied, the lugs 202 on both sides of the beam 201 are attached to the connection area with the structural adhesive, thereby fixing the lugs 202 and the battery cell 100. However, since the beam 201 of the pultruded beam 200 is also fixed to the crossbeam 101 by bolts, during the production process, while attaching the lugs 202 on both sides of the beam 201 to the connection area with the structural adhesive, the fasteners 300 are sequentially passed through the beam 201 and the crossbeam 101 of the pultruded beam 200 for fixation. Because bolts are used for fixation, there is no need to wait for the structural adhesive to solidify before proceeding to the next production process, which can significantly improve production efficiency and save production time costs.

[0036] According to one embodiment provided by this utility model, such as Figure 4 As shown, the beam 201 has a first base plate 2011, a second base plate 2012 and a third base plate 2013. The first base plate 2011 is located above the second base plate 2012, and the second base plate 2012 is located above the third base plate 2013. The first base plate 2011, the second base plate 2012 and the third base plate 2013 are all provided with mounting holes 203.

[0037] In this embodiment, in order to ensure that the bolts can pass smoothly through the first base plate 2011, the second base plate 2012 and the third base plate 2013 and be sealed and fixed after being threaded to the crossbeam 101, after the bolts are threaded to the nuts reserved at the corresponding positions of the crossbeam 101, sealant is applied to the connection to form a sealing surface, thereby ensuring the overall connection strength and connection stability.

[0038] According to one embodiment of the present invention, the diameter of the mounting hole 203 in the first base plate 2011 is larger than the diameter of the mounting hole 203 in the second base plate 2012, and the diameter of the mounting hole 203 in the second base plate 2012 is larger than the diameter of the mounting hole 203 in the third base plate 2013.

[0039] In this embodiment, the mounting holes 203 at the bottom of each layer in the beam 201 are all smaller than the mounting holes 203 at the top layer. That is, the diameter of the mounting holes 203 in the first bottom plate 2011 is larger than the diameter of the mounting holes 203 in the second bottom plate 2012, and the diameter of the mounting holes 203 in the second bottom plate 2012 is larger than the diameter of the mounting holes 203 in the third bottom plate 2013. With the above arrangement, the bolts can pass through the first two layers of the beam 201 and be connected and fixed to the crossbeam 101 at the bottom layer by nuts. At the same time, it can also ensure the good fixation of the bolts of the pultruded beam 200 and the crossbeam 101.

[0040] Example 2 like Figure 1 As shown, this utility model also provides a battery pack, including the above-mentioned cell fixing structure.

[0041] In this embodiment, the battery pack includes the aforementioned cell fixing structure. By using the aforementioned cell fixing structure, the warping of adjacent cells 100 caused by fixing with pressure plates in traditional battery packs is avoided. This ensures the connection strength between the pultrusion beam 200 and the crossbeam 101. At the same time, since the fixing member 300 is provided for cooperation and fixing, the time for waiting for the structural adhesive to cure in the traditional pressure plate fixing method is eliminated, which significantly improves production efficiency.

[0042] The battery pack adopts a CTP (Cell to Pack, i.e., module-less battery pack) structure. The bottom of the battery cell 100 is directly fixed to the lower casing of the battery pack with structural adhesive. After fixing the battery cell 100, a limiting strip is attached to the contact position between the shoulder of the battery cell 100 and the pultrusion beam 200. Structural adhesive is applied to the limiting strip area of ​​the battery cell 100. Then, the pultrusion beam 200 is attached to the connection area of ​​the battery cell 100 where the structural adhesive is applied. Finally, bolts are used to fix the pultrusion beam 200 to the crossbeam 101, and then the next production process can be carried out directly.

[0043] Example 3 This invention also provides a car that includes the aforementioned battery pack.

[0044] In this embodiment, the vehicle includes the aforementioned battery pack, thereby avoiding the situation where adjacent cells 100 in the traditional battery pack are fixed by pressure plates during the vehicle production process, which would cause the edges to warp. Also, because a fixing component 300 is provided for cooperation and fixing, the time required for the structural adhesive to cure in the traditional pressure plate fixing method is eliminated, thereby significantly improving the production efficiency of the entire vehicle.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery cell fixing structure, characterized in that, Comprises a battery cell (100), a cross beam (101) and a pultruded beam (200); The battery cells (100) are fixedly arranged in a lower case of a battery pack, and the cross beam (101) is arranged between adjacent battery cells (100); The upper surface of the pultruded beam (200) is higher than the upper surface of shoulders of the battery cells (100), two ends of the pultruded beam (200) are respectively connected with the shoulders of the battery cells (100) on two sides, and the pultruded beam (200) is further connected with the cross beam (101) through a fixing member (300).

2. The cell fixing structure according to claim 1, characterized in that, The pultruded beam (200) comprises a beam body (201) and oppositely arranged hanging lugs (202); The hanging lugs (202) are respectively arranged on two sides of a top wall of the beam body (201), a lower bottom surface of each hanging lug (202) is connected with the upper surface of the shoulder of the corresponding battery cell (100), and the fixing member (300) passes through the beam body (201) and the cross beam (101) to fix the pultruded beam (200) and the cross beam (101).

3. The cell fixing structure according to claim 2, characterized in that, The fixing member (300) is a bolt, a plurality of mounting holes (203) are spaced along the length direction of the beam body (201), a nut is arranged at a position of the cross beam (101) corresponding to each mounting hole (203), and the bolt passes through the mounting hole (203) and is in threaded fit with the nut.

4. The cell fixing structure according to claim 3, characterized in that, The cross-section of the beam body (201) is in a grid shape.

5. The cell fixing structure according to claim 2, characterized in that, A limiting strip is arranged on the upper surface of the shoulder of the battery cell (100), the limiting strip encloses to form a connecting area, and the hanging lug (202) is connected with the connecting area.

6. The cell fixing structure according to claim 5, characterized in that, Structural adhesive is coated in the connecting area.

7. The cell fixing structure according to claim 4, characterized in that, The beam body (201) comprises a first bottom plate (2011), a second bottom plate (2012) and a third bottom plate (2013), the first bottom plate (2011) is located above the second bottom plate (2012), the second bottom plate (2012) is located above the third bottom plate (2013), and the mounting hole (203) is formed in each of the first bottom plate (2011), the second bottom plate (2012) and the third bottom plate (2013).

8. The cell fixing structure according to claim 7, characterized in that, The aperture of the mounting hole (203) formed in the first bottom plate (2011) is larger than the aperture of the mounting hole (203) formed in the second bottom plate (2012), and the aperture of the mounting hole (203) formed in the second bottom plate (2012) is larger than the aperture of the mounting hole (203) formed in the third bottom plate (2013).

9. A battery pack, characterized in that, Comprises the battery cell fixing structure according to any one of claims 1 to 8.

10. A car, characterized in that, Comprises the battery pack according to claim 9.

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