Electric device

Abstract

The utility model discloses a power utilization device. The power utilization device comprises a supporting plate arranged between a battery column and a bottom plate; the supporting plate comprises a bearing part abutting against the bottom of the battery column and reinforcing structures arranged at the two ends of the bearing part in the X direction. The reinforcing structure includes a top plate portion located relatively below the end plate and adapted to support the end plate; the inner side plate part and the outer side plate part are connected to the two ends of the top plate part in the X direction, and the inner side plate part is connected between the top plate part and the bearing part; the outer side plate part is connected with one end, far away from the inner side plate part, of the top plate part, is spaced from the side plate, and one end, far away from the top plate part, of the outer side plate part abuts against the bottom plate; the size of the top plate part in the X direction is defined as a, the distance between the outer edge plate part and the side plate is defined as b, and a / b is larger than or equal to 0.5 and smaller than or equal to 1. According to the power utilization device provided by the utility model, the space utilization rate in the power utilization device is ensured, the area of the air cooling channel is ensured, and the supporting plate is ensured to have enough supporting strength.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an electric device. Background Art

[0002] While providing electrical energy, the battery pack also generates a large amount of heat, which accelerates the aging of the battery and even poses the risk of explosion due to thermal runaway. By forming an air-cooling channel in the battery pack to accelerate air circulation and cool the battery, the potential danger of heat accumulation in the battery pack can be reduced. However, if the air-cooling channel occupies a large space in the battery pack, it is easy to reduce the energy density; if the air-cooling channel is too narrow, it is easy to increase the flow resistance, resulting in poor cooling effect. Utility Model Content

[0003] In view of this, the utility model provides an electrical device to solve the problem that the air cooling channel of the electrical device and the utilization rate of the space inside the package cannot be taken into account at the same time.

[0004] The utility model provides an electric device, comprising:

[0005] At least one battery column, the battery column is formed by stacking a number of battery cells along the X direction;

[0006] End plates, disposed at both ends of the battery row along the X direction;

[0007] A box body, the box body comprising a bottom plate located relatively below the battery array, and side plates arranged on both side edges of the bottom plate along the X direction;

[0008] The support plate is arranged between the battery array and the bottom plate; the support plate includes a supporting portion abutting against the bottom of the battery array, and a reinforcing structure arranged at both ends of the supporting portion along the X direction; the supporting portion is spaced apart from the bottom plate;

[0009] The orthographic projection of the battery column on the base plate does not coincide with the reinforcement structure;

[0010] The reinforcement structure includes a top plate portion located relatively below the end plate and suitable for supporting the end plate; and an inner plate portion and an outer plate portion connected to both ends of the top plate portion along the X direction, the inner plate portion is connected between the top plate portion and the supporting portion, and is arranged opposite to the end surface of the battery column along the X direction; the outer plate portion is connected to an end of the top plate portion away from the inner plate portion, and is spaced apart from the side plate, and an end of the outer plate portion away from the top plate portion is directly or indirectly abutted against the bottom plate;

[0011] The dimension of the top plate along the X direction is defined as a, and the distance between the outer plate and the side plate is defined as b, satisfying: 0.5≤a / b≤1.

[0012] Beneficial effects: On the one hand, the reinforcing structure is connected to the supporting part and can play a supporting role for the supporting part. On the other hand, it can be fixed to the bottom plate by means of the reinforcing structure to achieve fixation of the support plate. In addition, the reinforcing structure can also fix the end plate to play a supporting and restraining role for the end plate. The outer plate portion is connected to the end of the top plate portion away from the inner plate portion, and the end of the outer plate portion away from the top plate portion directly or indirectly abuts against the bottom plate, thereby supporting the entire support plate. The inner plate portion is connected between the top plate portion and the supporting part, and is arranged opposite to the end face of the battery column along the X direction. On the one hand, the reinforcing structure realizes the connection of the supporting part to ensure that the supporting part and the bottom plate are spaced apart. On the other hand, the end face of the battery column along the X direction can be limited to ensure the fixed stability of the battery column. By limiting the upper limit of a / b, insufficient operating space for the connection between the support plate and the bottom plate can be avoided, and excessive flow resistance caused by the air passage being too narrow can be avoided; by limiting the lower limit of a / b, the top plate portion used to support the end plate can be avoided from being too narrow, thereby ensuring the connection strength between the end plate and the support plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is a schematic diagram of the exploded state of the electric device of the utility model;

[0015] Figure 2 It is a cross-sectional schematic diagram of the electric device of the utility model along the XZ plane;

[0016] Figure 3 for Figure 2 Partial magnification Figure 1 ;

[0017] Figure 4 for Figure 2 Partial magnification Figure 2 ;

[0018] Figure 5 It is a partial schematic diagram of the cross section of the electric device of the utility model along the XZ plane;

[0019] Figure 6 This is a schematic diagram of the assembly state of another support plate and a box body of the utility model.

[0020] Description of reference numerals:

[0021] 1. Battery cell; 10. Battery array; 11. End plate; 111. First connector; 100. Battery pack;

[0022] 2. Box body; 22. Bottom plate; 221. Second connecting member; 23. Side plate;

[0023] 3. Support plate; 32. Reinforcement structure; 321. Inner plate portion; 322. Top plate portion; 323. Outer plate portion; 33. Extension portion; 34. Support portion; 35. Flanging portion;

[0024] 5. Top cover. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, 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, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 indirectly connected 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 according to specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] A plurality of battery cells 1 are arranged in the electrical device. In order to increase the battery capacity in the electrical device, the plurality of battery cells 1 are often arranged regularly. A plurality of battery cells 1 are stacked along the X direction to form a battery column 10, and a plurality of battery columns 10 are sequentially arranged along the Y direction to form a battery pack 100. The battery pack 100 is then placed in the box 2 to complete the arrangement of the battery cells 1 in the electrical device.

[0030] While providing electrical energy, batteries also generate a large amount of heat. In order to speed up the heat dissipation of batteries in electrical devices, air cooling channels are formed in the electrical devices to accelerate air circulation and thus cool down the batteries, thereby reducing the potential dangers caused by heat accumulation in the batteries.

[0031] Taking the air cooling channel formed at the bottom of the battery pack 100 as an example, the formation of the air cooling channel requires the battery pack 100 to be suspended so that a cavity for air to pass through is formed between the bottom plate 22 of the box 2 and the battery pack 100. However, if the air cooling channel occupies a large space in the electrical device, it is easy to reduce the energy density; and if the air cooling channel is too narrow, it is easy to increase the flow resistance, resulting in poor cooling effect.

[0032] Taking the example of an air cooling channel formed on the side of the battery pack 100 along the X direction, the gap between the battery pack 100 and the box body 2 forms a cavity for air to pass through. If the air cooling channel occupies a larger space in the electrical device, it is easy to cause a decrease in energy density; and when the air cooling channel is too narrow, it is easy to cause an increase in flow resistance, resulting in a poor cooling effect. In addition, due to the large weight of the battery pack 100, in order to ensure good support for the battery pack 100, the support plate 3 used to support the battery pack 100 needs to have sufficient support strength to meet the support requirements for the battery pack 100. Therefore, the space utilization rate in the electrical device, the guarantee of air cooling effect and the guarantee of structural support strength need to be taken into account in many aspects.

[0033] The electrical device provided in the embodiment of the utility model can ensure the area of ​​the air cooling channel while ensuring the space utilization in the electrical device, avoid excessive flow resistance caused by the air cooling channel being too narrow, and ensure that the support plate 3 has sufficient supporting strength.

[0034] Combine the following Figures 1 to 6 , describing an embodiment of the utility model.

[0035] According to an embodiment of the utility model, there is provided an electric device, comprising:

[0036] At least one battery column 10, wherein the battery column 10 is formed by stacking a plurality of battery cells 1 along the X direction;

[0037] The end plates 11 are disposed at both ends of the battery row 10 along the X direction;

[0038] The box body 2 includes a bottom plate 22 located relatively below the battery array 10, and side plates 23 arranged on both side edges of the bottom plate 22 along the X direction;

[0039] The support plate 3 is disposed between the battery array 10 and the bottom plate 22; the support plate 3 includes a supporting portion 34 abutting against the bottom of the battery array 10, and a reinforcing structure 32 disposed at both ends of the supporting portion 34 along the X direction; the supporting portion 34 is spaced apart from the bottom plate 22;

[0040] The orthographic projection of the battery array 10 on the bottom plate 22 does not overlap with the reinforcement structure 32;

[0041] The reinforcing structure 32 includes a top plate portion 322 located relatively below the end plate 11 and suitable for supporting the end plate 11; and an inner plate portion 321 and an outer plate portion 323 connected to both ends of the top plate portion 322 along the X direction, wherein the inner plate portion 321 is connected between the top plate portion 322 and the supporting portion 34, and is arranged opposite to the end surface of the battery column 10 along the X direction; the outer plate portion 323 is connected to one end of the top plate portion 322 away from the inner plate portion 321, and is spaced apart from the side plate 23, and one end of the outer plate portion 323 away from the top plate portion 322 directly or indirectly abuts against the bottom plate 22;

[0042] The dimension of the top plate portion 322 along the X direction is defined as a, and the distance between the outer plate portion 323 and the side plate 23 is defined as b, satisfying: 0.5≤a / b≤1.

[0043] It should be noted that the X direction, Y direction, and Z direction referred to in this embodiment are all directions shown in the figure. Preferably, the X direction, Y direction, and Z direction are perpendicular to each other. The X direction may be the width direction of the battery pack 100 and the entire electric device, the Y direction may be the length direction of the battery pack 100 and the entire electric device, and the Z direction may be the height direction of the battery pack 100 and the entire electric device.

[0044] After a number of battery cells 1 are stacked in the X direction to form a battery column 10, in order to fix the battery column 10, end plates 11 are respectively provided at both ends of the battery column 10 in the X direction, and the battery column 10 can be clamped by the end plates 11 at both ends. The end plates 11 can be fixed by abutting against the side plates 23 of the box body 2; the end plates 11 can also be fixed to the bottom plate 22; or a packing tape can be used to wrap around the outer sides of the end plates 11 on both sides, so that the combination formed by the end plates 11 and the battery column 10 can be fixed.

[0045] In this embodiment, the end plate 11 is fixed to the support plate 3 to achieve the constraint on the end plate 11, thereby ensuring the constraint on the battery array 10. The end plate 11 can be fixed to the top plate portion 322 of the reinforcement structure 32.

[0046] The support plate 3 is disposed relatively below the battery array 10 along the Z direction, so that the support plate 3 supports the battery array 10. The support plate 3 includes a supporting portion 34 abutting against the bottom of the battery array 10, and a reinforcing structure 32 disposed at both ends of the supporting portion 34 along the X direction;

[0047] In this embodiment, the reinforcing structure 32 is connected to the supporting portion 34 on the one hand and can support the supporting portion 34 , and on the other hand, the reinforcing structure 32 can be fixed to the bottom plate 22 to achieve fixation of the support plate 3; in addition, the reinforcing structure 32 can also fix the end plate 11 to support and restrain the end plate 11.

[0048] The reinforcement structure 32 specifically includes a top plate portion 322 , an inner side plate portion 321 and an outer side plate portion 323 .

[0049] The top plate portion 322 is located relatively below the end plate 11 and is suitable for supporting the end plate 11 .

[0050] The outer plate portion 323 is connected to one end of the top plate portion 322 away from the inner plate portion 321 , and one end of the outer plate portion 323 away from the top plate portion 322 is directly or indirectly in contact with the bottom plate 22 , thereby supporting the entire support plate 3 .

[0051] The inner plate portion 321 is connected between the top plate portion 322 and the supporting portion 34, and is arranged opposite to the end surface of the battery column 10 along the X direction. On the one hand, it realizes the connection between the reinforcing structure 32 and the supporting portion 34 to ensure that the supporting portion 34 and the bottom plate 22 are spaced apart. On the other hand, it can limit the end surface of the battery column 10 along the X direction to ensure the fixed stability of the battery column 10.

[0052] Since the outer plate portion 323 is spaced apart from the side plate 23 , an air passage is formed between the outer plate portion 323 and the side plate 23 .

[0053] Combination Figure 5 As shown, the supporting portion 34 is provided with reinforcing structures 32 at both ends along the X direction, and the reinforcing structures 32 at both ends are symmetrical, and the end faces of the battery column 10 at both ends along the X direction are respectively arranged corresponding to the inner edge plate portions 321 at both ends, so that the battery column 10 is arranged between the inner edge plate portions 321 at both ends, and preferably, the battery column 10 is respectively abutted against the inner edge plate portions 321 at both ends.

[0054] The dimension a of the top plate portion 322 along the X direction affects the connection strength between the support plate 3 and the end plate 11; the spacing b between the outer plate portion 323 and the side plate 23 affects the size of the gap between the end plate 11 and the side plate 23, which is part of the air cooling channel, and the b value affects the operating space of the connection between the support plate 3 and the bottom plate 22.

[0055] By limiting the upper limit of a / b, insufficient operating space for the connection between the support plate 3 and the bottom plate 22 can be avoided, and excessive flow resistance caused by the air passage being too narrow can be avoided; by limiting the lower limit of a / b, the top plate portion 322 for supporting the end plate 11 can be avoided from being too narrow, thereby ensuring the connection strength between the end plate 11 and the support plate 3.

[0056] In some embodiments, in combination Figure 4 , Figure 5 As shown, the dimension of the battery column 10 along the X direction is defined as c, which satisfies: 0.02≤a / c≤0.06.

[0057] The dimension of the battery column 10 along the X direction is the maximum distance between the battery cells 1 at both ends of the battery column 10 along the X direction.

[0058] Since the battery array 10 is disposed between the inner side plates 321 at both ends, it is preferred that the battery array 10 abuts against the inner side plates 321 at both ends, that is, the support plate 3 and the end plate 11 jointly tighten and fix the battery array 10 .

[0059] The dimension a of the top plate portion 322 along the X direction affects the connection strength between the support plate 3 and the end plate 11. The top plate portion 322 provides a sufficiently stable pre-tightening force for the end plate 11, thereby providing a more stable pre-tightening force for the battery array 10, and the pre-tightening force provided by the top plate portion 322 to the end plate 11 is positively correlated with the length of the battery array 10. The longer the battery array, the greater the connection strength required to provide a more stable pre-tightening force.

[0060] By limiting the lower limit of a / c, it is possible to ensure that the top plate portion 322 provides a sufficiently stable preload force for the end plate 11, thereby ensuring that the battery array 10 is securely fixed; by limiting the upper limit of a / c, it is possible to avoid wasting space due to the excessive size a of the top plate portion 322 along the X direction, thereby ensuring the space utilization rate of the electrical device and the energy density.

[0061] In some embodiments, in combination Figure 4 As shown, the projection of the end plate 11 toward the bottom plate 22 is at least partially located within the projection range of the top plate portion 322 toward the bottom plate 22;

[0062] The dimension of the projection of the end plate 11 toward the bottom plate 22 along the X direction is defined as e, which satisfies: 0.95≤e / a≤1.1. By making the projection of the end plate 11 toward the bottom plate 22 at least partially located within the projection range of the top plate portion 322 toward the bottom plate 22, the top plate portion 322 can support the end plate 11 and ensure the supporting effect.

[0063] In this embodiment, the plane where the end plate 11 is located is perpendicular to the bottom plate 22, and the plane where the end plate 11 is located is perpendicular to the top plate portion 322. The dimension e of the projection of the end plate 11 toward the bottom plate 22 along the X direction is the thickness of the end plate 11 along the X direction.

[0064] The top plate portion 322 needs to be provided with a fixing hole so that the first connecting member 111 for fixing the end plate 11 can pass through the fixing hole.

[0065] By limiting the upper limit of e / a, it is possible to prevent the end plate 11 from exceeding the range of the top plate portion 322 too much, and to prevent the dimension a of the top plate portion 322 along the X direction from being too small. If the dimension a of the top plate portion 322 along the X direction is too small, the size of the fixing hole will be relatively large, which will reduce the effective area of ​​the top plate portion 322 and put the top plate portion 322 at risk of bending, cracking and deformation. By limiting the lower limit of e / a, it is possible to prevent the dimension a of the top plate portion 322 along the X direction from being too large, thereby avoiding wasting space.

[0066] In some embodiments, in combination Figure 5 As shown, the dimension of the bottom plate 22 along the X direction is defined as d, which satisfies: 0.06≤b / d≤0.1.

[0067] Since the side plates 23 are provided on both side edges of the bottom plate 22 along the X direction, in this embodiment, the dimension d of the bottom plate 22 along the X direction is also the distance between the side plates 23 on both sides along the X direction.

[0068] By limiting the lower limit of b / d, it is possible to avoid excessive flow resistance due to the air passage being too narrow; by limiting the upper limit of b / d, it is possible to avoid low space utilization due to the air passage being too wide. Thus, the air cooling flow resistance and the space utilization of the whole package can be balanced.

[0069] In some embodiments, in combination Figure 3 As shown, the support plate 3 is further provided with an extension portion 33, which is formed by extending an end of the outer plate portion 323 close to the bottom plate 22 toward the side plate 23, and the extension portion 33 is suitable for abutting against the bottom plate 22;

[0070] The dimension of the extension portion 33 along the X direction is equal to b.

[0071] By extending the extension portion 33 from one end of the outer plate portion 323 close to the bottom plate 22 toward the side plate 23, the extension portion 33 can be in contact with the side plate 23, thereby ensuring that the outer plate portion 323 and the side plate 23 are spaced apart and the spacing between the outer plate portion 323 and the side plate 23 is ensured, thereby reducing the lateral slippage of the support plate 3 along the X direction.

[0072] Additionally, the extension portion 33 is provided with a mounting hole, and the base plate 22 is correspondingly provided with a second connecting member 221 . By passing the mounting hole through the second connecting member 221 , the extension portion 33 and the base plate 22 can be fixed, thereby ensuring that the support plate 3 and the base plate 22 are firmly fixed.

[0073] In some embodiments, in combination Figure 4As shown, the plane where the extension portion 33 is located is parallel to the plane where the top plate portion 322 is located, and both are parallel to the plane where the bottom plate 22 is located;

[0074] Along a plane perpendicular to the bottom plate 22 , a height difference between the top plate portion 322 and the extension portion 33 is h, which satisfies: 1.5≤h / a≤2.0.

[0075] Since the mass of the battery pack 100 is relatively large, after the battery pack 100 is fixed to the support plate 3, if the ratio h / a is too large, the outer plate portion 323 may be easily driven by the end plate 11 to swing left and right when XY vibration occurs, and metal fatigue may easily lead to bending or even breakage in the long run; if the ratio h / a is too small, if the dimension a of the denominator parameter top plate portion 322 along the X direction is too large, it will be unfavorable to improve the space utilization and energy density of the whole package; if the numerator parameter h is too small, the inner plate portion 321 and the battery will overlap too little in height, which is not conducive to clamping the battery.

[0076] In some embodiments, in combination Figure 2 As shown, the electrical device further includes: a top cover 5 covering the upper side of the battery array 10, and a storage space for the battery array 10 is formed between the top cover 5 and the bottom plate 22;

[0077] The direction perpendicular to the bottom plate 22 is defined as the Z direction;

[0078] The supporting portion 34 is parallel to the bottom plate 22, and the distance between the supporting portion 34 and the bottom plate 22 along the Z direction is f;

[0079] The top cover 5 is parallel to the bottom plate 22, and the distance between the top cover 5 and the bottom plate 22 along the Z direction is p;

[0080] Satisfies: 0.05≤f / p≤0.1.

[0081] Since the supporting portion 34 is spaced apart from the bottom plate 22, an air passage is formed between the supporting portion 34 and the bottom plate 22. If f / p is too large, the size of the air passage will be too large. Although it can meet the air intake demand, it will lead to low space utilization. If f / p is too small, it will easily lead to the air passage being too narrow and the flow resistance being too large, resulting in insufficient air intake, which in turn leads to a poor cooling effect on the battery.

[0082] In some embodiments, in combination Figure 4 As shown, the direction perpendicular to the bottom plate 22 is defined as the Z direction;

[0083] The dimension of the projection of the inner plate portion 321 toward the battery array 10 along the Z direction is j; the height of the battery array 10 along the Z direction is s, which satisfies: 0.08≤j / s≤0.5.

[0084] By limiting the upper limit of j / s, it is possible to avoid the inner plate portion 321 being too high in the Z direction, which in turn causes the outer plate portion 323 to be too high. When XY vibration occurs, the outer plate portion 323 is easily driven by the end plate 11 to swing left and right, which is prone to metal fatigue and even breakage in the long run. By limiting the lower limit of j / s, it is possible to avoid the inner plate portion 321 and the battery from overlapping too little in height, which is not conducive to clamping the battery.

[0085] In addition, if j / s is too large, the dimension of the inner plate portion 321 along the Z direction is too high, which will make the dimension of the end plate 11 along the Z direction too small, resulting in insufficient restraint force of the end plate 11 on the battery array 10 .

[0086] In some embodiments, in combination Figure 3 As shown, the end surface of the battery row 10 along the X direction is arranged parallel to the plane where the inner side plate portion 321 is located;

[0087] The end surface of the battery row 10 along the X direction is arranged perpendicular to the plane where the bottom plate 22 is located.

[0088] By arranging the end surface of the battery array 10 along the X direction parallel to the plane where the inner side plate portion 321 is located, it is possible to ensure that the battery array 10 fits the inner side plate portion 321 and that the force is balanced.

[0089] In some embodiments, in combination Figure 6 As shown, the support plate 3 is further provided with a flange portion 35 , and the flange portion 35 is formed by extending along the side plate 23 from the side of the extension portion 33 away from the outer plate portion 323 .

[0090] By further providing the flange portion 35 , it is possible to facilitate the support plate 3 to abut against the side plate 23 , thereby improving the stability of the support plate 3 along the X direction.

[0091] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.

Claims

1. An electrical device, characterized in that: include: At least one battery row (10), wherein the battery row (10) is formed by stacking a plurality of battery cells (1) along the X direction; End plates (11) are disposed in contact with two ends of the battery row (10) along the X direction; A box body (2), the box body (2) comprising a bottom plate (22) located relatively below the battery array (10), and side plates (23) arranged on both side edges of the bottom plate (22) along the X direction; A support plate (3) is arranged between the battery array (10) and the bottom plate (22); the support plate (3) comprises a supporting portion (34) abutting against the bottom of the battery array (10), and a reinforcing structure (32) arranged at both ends of the supporting portion (34) along the X direction; the supporting portion (34) and the bottom plate (22) are arranged at a distance; The orthographic projection of the battery row (10) on the bottom plate (22) does not overlap with the reinforcement structure (32); The reinforcing structure (32) comprises a top plate portion (322) located relatively below the end plate (11) and suitable for supporting the end plate (11); and an inner plate portion (321) and an outer plate portion (323) connected to both ends of the top plate portion (322) along the X direction, wherein the inner plate portion (321) is connected between the top plate portion (322) and the supporting portion (34), and is arranged opposite to the end surface of the battery column (10) along the X direction; the outer plate portion (323) is connected to an end of the top plate portion (322) away from the inner plate portion (321), and is spaced from the side plate (23), and an end of the outer plate portion (323) away from the top plate portion (322) is directly or indirectly in contact with the bottom plate (22); The dimension of the top plate portion (322) along the X direction is defined as a, and the spacing between the outer plate portion (323) and the side plate (23) is defined as b, satisfying: 0.5≤a / b≤1.

2. The electrical device according to claim 1, characterized in that: The dimension of the battery column (10) along the X direction is defined as c, which satisfies: 0.02≤a / c≤0.

06.

3. The electrical device according to claim 1, characterized in that: The projection of the end plate (11) toward the bottom plate (22) is at least partially located within the projection range of the top plate portion (322) toward the bottom plate (22); The dimension of the projection of the end plate (11) toward the bottom plate (22) along the X direction is defined as e, which satisfies: 0.95≤e / a≤1.

1.

4. The electrical device according to claim 1, characterized in that: The dimension of the bottom plate (22) along the X direction is defined as d, which satisfies: 0.06≤b / d≤0.

1.

5. The electrical device according to claim 1, characterized in that: The support plate (3) is further provided with an extension portion (33), the extension portion (33) being formed by extending from one end of the outer plate portion (323) close to the bottom plate (22) toward the side plate (23), and the extension portion (33) is suitable for abutting against the bottom plate (22); The dimension of the extension portion (33) along the X direction is equal to b.

6. The electrical device according to claim 5, characterized in that: The plane where the extension portion (33) is located is parallel to the plane where the top plate portion (322) is located, and both are parallel to the plane where the bottom plate (22) is located; Along a plane perpendicular to the bottom plate (22), the height difference between the top plate portion (322) and the extension portion (33) is h, satisfying: 1.5≤h / a≤2.

0.

7. The electrical device according to any one of claims 1 to 6, characterized in that: The electrical device further comprises: a top cover (5) covering the upper side of the battery array (10), wherein a storage space for the battery array (10) is formed between the top cover (5) and the bottom plate (22); A direction perpendicular to the bottom plate (22) is defined as a Z direction; The supporting portion (34) is parallel to the bottom plate (22), and the distance between the supporting portion (34) and the bottom plate (22) along the Z direction is f; The top cover (5) is parallel to the bottom plate (22), and the distance between the top cover (5) and the bottom plate (22) along the Z direction is p; Satisfies: 0.05≤f / p≤0.

1.

8. The electrical device according to any one of claims 1 to 6, characterized in that: A direction perpendicular to the bottom plate (22) is defined as a Z direction; The dimension of the projection of the inner edge plate portion (321) toward the battery column (10) along the Z direction is j; the height of the battery column (10) along the Z direction is s, satisfying the following: 0.08≤j / s≤0.

5.

9. The electrical device according to claim 8, characterized in that: The end surface of the battery row (10) along the X direction is arranged parallel to the plane where the inner edge plate portion (321) is located; The end surface of the battery row (10) along the X direction is arranged perpendicular to the plane where the bottom plate (22) is located.

10. The electrical device according to claim 5 or 6, characterized in that: The support plate (3) is further provided with a flange portion (35), and the flange portion (35) is formed by extending from a side of the extension portion (33) away from the outer plate portion (323) along the side plate (23).

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