Anti-expansion beam assembly, battery box body and battery pack
By setting a combination structure of main beam and reinforcing member inside the battery casing, the problem of easy failure of weld seam at the connection between battery anti-expansion beam and casing is solved, and the effect of improving anti-expansion performance without affecting battery energy density is achieved.
Patent Information
- Application Number
- CN202423002165.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-05
AI Technical Summary
The weld at the connection between the anti-expansion beam and the casing of existing batteries is prone to failure, resulting in insufficient weld strength. Increasing the wall thickness or width of the anti-expansion beam will increase the space occupied and weight, affecting the energy density of the battery.
The structure adopts a combination of main beam and reinforcing members. The main beam is welded to the inner wall of the shell, and the reinforcing members increase the connection strength, disperse the expansion force of the battery cell, reduce the stress on the weld, and prevent the main beam from failing.
Improve the battery housing's resistance to expansion, reduce the impact on battery energy density, and enhance connection strength without increasing weight or space occupation.
Smart Images
Figure CN223728943U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to energy storage equipment technical field especially relates to a kind of anti-expansion beam assembly, battery box and battery pack. BACKGROUND
[0002] The anti-expansion beam in the battery is used to limit the expansion space of the battery cell. The existing battery is generally directly welded on the shell frame of the battery to resist the entire expansion force of the battery cell. However, all the expansion force of the battery cell will be transmitted to the welding seam between the anti-expansion beam and the shell, which is easy to cause the welding seam to fail. The wall thickness and overall width of the anti-expansion beam are the main factors affecting the anti-expansion performance of the battery box. Increasing the wall thickness or the width can increase the welding area, but at the same time, it will also increase the occupied space of the anti-expansion beam and the overall weight of the battery pack, which is not conducive to the energy density. It is costly to improve the strength. SUMMARY
[0003] One object of the present utility model is to provide an anti-expansion beam assembly that can improve the anti-expansion performance of the battery box and reduce the impact on the energy density of the battery.
[0004] To achieve this object, the present utility model adopts the following technical solutions:
[0005] An anti-expansion beam assembly is provided, which is arranged in the shell of a battery. The anti-expansion beam assembly comprises:
[0006] A main beam is welded to the inner wall of the shell. The stress surface of the main beam is used to resist the expansion of the battery cell.
[0007] A reinforcing member is partially connected to the main beam and partially connected to the shell.
[0008] Optionally, the main beam further has a first mating surface, the reinforcing member has a second mating surface, the first mating surface is in contact with the second mating surface, the first mating surface is arranged opposite to the stress surface, the direction of the stress surface subjected to the expansion force of the battery cell is a first direction, and the first mating surface forms an acute angle with the first direction.
[0009] Optionally, the first mating surface faces the top surface of the shell, the first direction is parallel to the bottom surface of the shell, the top surface is arranged opposite to the bottom surface, and the main beam is connected to the bottom surface.
[0010] Or the first mating surface faces the bottom surface, the first direction is parallel to the top surface, the top surface is arranged opposite to the bottom surface, and the main beam is connected to the top surface.
[0011] Optionally, the reinforcing member is welded to the main beam and the shell.
[0012] Optionally, the reinforcing member is provided with N reinforcing members along the weld joint between the main beam and the shell, N being a positive integer.
[0013] Optionally, the reinforcing member is provided with two reinforcing members, the main beam is connected with the first side wall and the second side wall of the shell, the first side wall and the second side wall are oppositely arranged, one reinforcing member is used for connecting the main beam and the first side wall, and the other reinforcing member is used for connecting the main beam and the second side wall.
[0014] Optionally, the reinforcing member has a fitting surface, and the fitting surface is fitted to the inner wall of the shell.
[0015] Optionally, the reinforcing member extends along the weld joint between the main beam and the shell, and the reinforcing member has a trapezoidal cross section, and the short side of the trapezoid faces the weld joint between the main beam and the shell.
[0016] Another purpose of the utility model is to provide a battery box body, which can improve the anti-expansion performance of the battery box body and reduce the influence on the energy density of the battery.
[0017] To achieve this purpose, the utility model adopts the following technical scheme:
[0018] The utility model provides a battery box body, which comprises a shell and the anti-expansion beam assembly, the anti-expansion beam assembly is arranged in the shell, and the anti-expansion beam assembly is connected to the inner wall of the shell.
[0019] Another purpose of the utility model is to provide a battery pack, which can improve the anti-expansion performance of the battery box body and reduce the influence on the energy density of the battery.
[0020] To achieve this purpose, the utility model adopts the following technical scheme:
[0021] The utility model provides a battery pack, which comprises a battery core and the battery box body, and the battery core is arranged in the battery box body.
[0022] The utility model has the beneficial effects that:
[0023] The utility model provides a kind of anti-expansion beam assembly, which is arranged in the shell of a battery, comprising a main beam and a reinforcing member. The main beam is welded to the inner wall of the shell, and the stress surface of the main beam is used to resist the swelling of the battery cell. The reinforcing member is partially connected to the main beam and partially connected to the shell. By providing the reinforcing member, the connection between the main beam and the shell can be made more secure. The connection between the reinforcing member and the main beam and the shell will withstand part of the swelling force of the battery cell, reducing the stress on the weld between the main beam and the shell, preventing the weld from breaking and the main beam from failing, thereby improving the anti-expansion performance of the battery box. The anti-expansion beam assembly can also reduce the impact on the energy density of the battery.
[0024] The utility model also provides a battery box, which comprises a shell and the above-mentioned anti-expansion beam assembly. The anti-expansion beam assembly is arranged in the shell, and is connected to the inner wall of the shell. The battery box can improve the anti-expansion performance and reduce the impact on the energy density of the battery.
[0025] The utility model also provides a battery pack, which comprises a battery cell and the above-mentioned battery box. The battery cell is arranged in the battery box. The battery pack can improve the anti-expansion performance of the battery box and reduce the impact on the energy density of the battery. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 is an exploded view of part of the structure of the battery box provided by the utility model embodiment;
[0027] Figure 2 is Figure 1 is an enlarged view of position A in FIG.
[0028] Figure 3 is a structural schematic view of the reinforcing member provided by the utility model embodiment;
[0029] Figure 4 is a structural schematic view of the battery box provided by the utility model embodiment;
[0030] Figure 5 is Figure 4 is a B-B sectional view in FIG.
[0031] Figure 6 is Figure 5 is an enlarged view of position C in FIG.
[0032] Figure 7 is a schematic view of part of the structure of the battery box provided by the utility model embodiment.
[0033] In the drawings:
[0034] 1, main beam; 11, first mating surface; 12, stress surface;
[0035] 2, reinforcement; 21, second mating surface; 22, bonding surface; 23, first weld; 24, second weld;
[0036] 3, housing; 31, top cover; 32, lower housing; 321, bottom surface; 322, first side wall; 323, second side wall. DETAILED DESCRIPTION
[0037] The technical solutions of the utility model are further illustrated below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely used to explain the utility model, rather than limit the utility model. In addition, it should be noted that only parts related to the utility model are shown in the drawings for the convenience of description, rather than all parts.
[0038] In the description of the utility model, it should be noted that unless explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0039] In the utility model, unless explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0040] The anti-expansion beam in the battery is used to limit the expansion space of the battery cell. The existing battery is generally directly welded on the shell frame of the battery, so as to resist the whole expansion force of the battery cell. However, all the expansion force of the battery cell will be transmitted to the welding seam between the anti-expansion beam and the shell, which is easy to cause the welding seam to fail. The wall thickness and the overall width of the anti-expansion beam are the main factors affecting the anti-expansion performance of the battery box. Increasing the wall thickness or the width can increase the welding area, but at the same time, it will also increase the occupied space of the anti-expansion beam, and will increase the overall weight of the battery pack, which is not conducive to the energy density. At the same time, the cost is large to improve the strength. Therefore, the embodiment provides an anti-expansion beam assembly, which can improve the anti-expansion performance of the battery box and reduce the influence on the energy density of the battery.
[0041] AsFigures 1-7 As shown in the figure, the anti-expansion beam assembly is arranged in the shell 3 of the battery, and includes the main beam 1 and the reinforcing member 2. The main beam 1 is welded to the inner wall of the shell 3, and the stress surface 12 of the main beam 1 is used to resist the expansion of the battery cell. The reinforcing member 2 is partially connected to the main beam 1 and partially connected to the shell 3. By arranging the reinforcing member 2, the firmness of the connection between the main beam 1 and the shell 3 can be increased. The connection between the reinforcing member 2 and the main beam 1 and the shell 3 will bear part of the expansion force of the battery cell, reducing the stress on the weld between the main beam 1 and the shell 3, preventing the failure of the main beam 1, and thus improving the anti-expansion performance of the battery box. Moreover, the anti-expansion beam assembly can reduce the impact on the energy density of the battery.
[0042] Optionally, the main beam 1 is an aluminum extruded profile, which is in the form of a plate. The two ends of the plate are connected to the two inner walls of the shell 3, and the side of the plate is connected to the bottom surface 321 of the shell 3.
[0043] Optionally, the reinforcing member 2 is arranged along the weld between the main beam 1 and the shell 3. N reinforcing members 2 are arranged along the weld, where N is a positive integer. By increasing the number of reinforcing members 2, the area covered by the reinforcing members 2 on the weld can be increased, and the reinforcing effect of the reinforcing members 2 on the firmness of the connection between the main beam 1 and the shell 3 can be further improved.
[0044] As shown in the figure, Figure 7 Optionally, in this embodiment, two reinforcing members 2 are arranged, and the main beam 1 is connected to the first side wall 322 and the second side wall 323 of the shell 3. The first side wall 322 and the second side wall 323 are arranged opposite to each other. One reinforcing member 2 is used to connect the main beam 1 and the first side wall 322, and the other reinforcing member 2 is used to connect the main beam 1 and the second side wall 323.
[0045] Of course, in other embodiments, the reinforcing member 2 can also be arranged at the welding position of the main beam 1 and the bottom surface 321, and used to connect the main beam 1 and the bottom surface 321. In addition, the number of reinforcing members 2 can also be increased to avoid other components in the battery box. This is not limited herein.
[0046] As shown in the figure, Figure 2 and Figure 3 Optionally, the main beam 1 also has a first matching surface 11, and the reinforcing member 2 has a second matching surface 21. The first matching surface 11 and the second matching surface 21 are in close contact with each other, so as to ensure that the reinforcing member 2 and the main beam 1 have a certain contact area, and prevent local stress from being too large and causing deformation of the reinforcing member 2 or the main beam 1.
[0047] Optionally, the first matching surface 11 and the stress surface 12 are arranged opposite to each other, and the direction of the stress surface 12 subjected to the expansion force of the battery cell is the first direction, Figure 6The 'oa' direction is the first direction. Optionally, the plate surface of the force-bearing surface 12 is perpendicular to the first direction. The first mating surface 11 forms an acute angle with the first direction, that is, the first mating surface 11 has a certain inclination relative to the direction of the expansion force received by the main beam 1. Furthermore, since the second mating surface 21 of the reinforcing member 2 is attached to the first mating surface 11, the second mating surface 21 also has a certain inclination, which can further reduce the stress at the weld between the main beam 1 and the shell 3.
[0048] Optionally, in this embodiment, the first mating surface 11 faces the top surface of the housing 3, the first direction is parallel to the bottom surface 321 of the housing 3, the top surface and the bottom surface 321 are opposite to each other, and the main beam 1 is connected to the bottom surface 321. In this embodiment, the main beam 1 is welded to the bottom surface 321 of the housing 3. When the main beam 1 is subjected to the expansion force of the battery cell along the first direction, the main beam 1 will squeeze the reinforcing member 2 and also press against the bottom surface 321 of the housing 3, further reducing the stress at the weld between the main beam 1 and the housing 3.
[0049] Alternatively, in other embodiments, when the main beam 1 and the top surface of the housing 3 are connected, the first mating surface 11 faces the bottom surface 321, the first direction is parallel to the top surface, the top surface and the bottom surface 321 are opposite to each other, and the main beam 1 is connected to the top surface. That is, when the main beam 1 is subjected to the expansion force of the battery cell along the first direction, the main beam 1 will squeeze the reinforcing member 2 and also press against the top surface of the housing 3, which can further reduce the stress at the weld between the main beam 1 and the housing 3.
[0050] like Figure 2 As shown, optionally, in this embodiment, the reinforcing member 2 is welded to both the main beam 1 and the shell 3 to ensure connection strength. Optionally, the reinforcing member 2 is welded to the shell 3 to form a first weld 23, and the reinforcing member 2 is welded to the main beam 1 to form a second weld 24. Optionally, in other embodiments, the reinforcing member 2 can also be connected to the main beam 1 and the shell 3 by means of screwing, riveting, etc.
[0051] Optionally, the reinforcing member 2 has a contact surface 22, which is attached to the inner wall of the housing 3 to ensure that there is a certain contact area between the reinforcing member 2 and the housing 3, so as to prevent stress concentration and deformation of the reinforcing member 2 or the housing 3.
[0052] Optionally, in the embodiment, the reinforcing member 2 extends along the weld between the main beam 1 and the shell 3, and the cross section of the reinforcing member 2 is trapezoidal, and the short side of the trapezoid faces the weld between the main beam 1 and the shell 3. That is, the length direction of the reinforcing member 2 is consistent with the direction of the weld between the main beam 1 and the shell 3. Optionally, the reinforcing member 2 is trapezoidal column, and among the two parallel faces, the smaller area face faces the weld between the main beam 1 and the shell 3, the larger area face faces away from the weld between the main beam 1 and the shell 3, and the two inclined faces are respectively the second matching face 21 and the abutting face 22, the second matching face 21 abuts the main beam 1, and the abutting face 22 abuts the inner wall of the shell 3. Of course, in other embodiments, the cross section of the reinforcing member 2 can also be provided in other shapes other than trapezoidal.
[0053] The embodiment also provides a battery box, which comprises the shell 3 and the anti-expansion beam assembly described above, the anti-expansion beam assembly is arranged in the shell 3, and the anti-expansion beam assembly is connected to the inner wall of the shell 3.
[0054] Optionally, in the embodiment, the shell 3 comprises a top cover 31 and a lower shell 323, the first side wall 322 and the second side wall 323 are two oppositely arranged side walls of the lower shell 323, and the bottom face 321 is the inner bottom face of the lower shell 323.
[0055] The battery box can improve the anti-expansion performance by arranging the reinforcing member 2, and can further improve the anti-expansion performance of the battery box by arranging the second matching face 21 of the reinforcing member 2 and the first matching face 11 of the main beam 1 to transmit the stress to the bottom face 321 of the shell 3. Moreover, the battery box can also reduce the influence on the energy density of the battery.
[0056] The embodiment also provides a battery pack, which comprises the battery core and the battery box described above, and the battery core is arranged in the battery box. The battery pack can improve the anti-expansion performance of the battery box and reduce the influence on the energy density of the battery.
[0057] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.
Claims
1. Anti-bulging beam assembly, characterized in that, An anti-expansion beam assembly is arranged in a shell (3) of a battery, the anti-expansion beam assembly comprising: a main beam (1) welded to an inner wall of the shell (3), a force receiving surface (12) of the main beam (1) being used to resist expansion of an electric cell; a reinforcing member (2) partially connected to the main beam (1) and partially connected to the shell (3).
2. The anti-bulging beam assembly of claim 1, wherein, The main beam (1) further has a first mating surface (11), the reinforcing member (2) has a second mating surface (21), the first mating surface (11) is in abutment with the second mating surface (21), the first mating surface (11) is arranged opposite to the force receiving surface (12), a direction in which the force receiving surface (12) is subjected to an expansion force of the electric cell is a first direction, and an acute angle is formed between the first mating surface (11) and the first direction.
3. The anti-bulging beam assembly of claim 2, wherein, The first mating surface (11) faces a top surface of the shell (3), the first direction is parallel to a bottom surface (321) of the shell (3), the top surface is arranged opposite to the bottom surface (321), and the main beam (1) is connected to the bottom surface (321); or the first mating surface (11) faces the bottom surface (321), the first direction is parallel to the top surface, the top surface is arranged opposite to the bottom surface (321), and the main beam (1) is connected to the top surface.
4. The anti-bulging beam assembly of claim 1, wherein, The reinforcing member (2) is welded to the main beam (1) and the shell (3).
5. The anti-bulging beam assembly according to any one of claims 1-4, wherein, The reinforcing member (2) is arranged along a welding seam between the main beam (1) and the shell (3), and N reinforcing members (2) are arranged, N being a positive integer.
6. The anti-bulging beam assembly of claim 5, wherein, The reinforcing member (2) is arranged along a welding seam between the main beam (1) and the shell (3), and N reinforcing members (2) are arranged, N being a positive integer.
7. The non-distorting beam assembly of any of claims 1-4, wherein, The reinforcing member (2) has an abutment surface (22) abutting an inner wall of the shell (3).
8. The non-distorting beam assembly of any one of claims 1-4, wherein, The reinforcing member (2) is arranged along a welding seam between the main beam (1) and the shell (3), and the reinforcing member (2) has a trapezoidal cross section, and a short side of the trapezoidal cross section faces the welding seam between the main beam (1) and the shell (3).
9. A battery case characterized by A battery comprising a shell (3) and an anti-expansion beam assembly as claimed in any one of claims 1-8, the anti-expansion beam assembly being arranged in the shell (3) and connected to an inner wall of the shell (3).
10. A battery pack characterized by, A battery comprising an electric cell and a battery case as claimed in claim 9, the electric cell being arranged in the battery case.