Battery pack and electric device

Abstract

The utility model provides a battery pack and an electric device. The utility model relates to a battery pack, which comprises a lower shell, an upper shell and a lower shell, the cold plate assembly is fixedly connected to the bottom ends of the two side beams; the first cold plate reinforcing pieces are fixedly connected to the bottom surface of the cold plate assembly, and each side edge beam is provided with one first cold plate reinforcing piece in a matched mode; in the vertical direction, the first cold plate reinforcing piece is at least partially overlapped with the inner edge of the bottom end of the side edge beam, and force transmission of the first cold plate reinforcing piece to the side edge beam is formed. According to the battery pack disclosed by the utility model, the first cold plate reinforcing piece is arranged at the bottom of the cold plate assembly and is partially overlapped with the side edge beam in the vertical direction, so that when the bottom of the battery pack is impacted, the first cold plate reinforcing piece can upwards transfer part of force to the lower shell through the cold plate assembly, the shearing force borne by the cold plate assembly is reduced, and the cold plate assembly is not easy to damage; the impact resistance of the battery pack is improved, the structural strength and modal maintenance of the battery pack are optimized, and the use safety of the installation package is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack. The utility model also relates to an electrical device equipped with the battery pack. Background Art

[0002] With the rise of the new energy industry, the development level of the battery pack has become an important factor restricting many current power-consuming device industries. The main structure of the battery pack includes a battery module, a lower shell, a cold plate, electrical components, and a bottom guard plate. The battery module is installed in the lower shell. The cold plate is installed on the lower shell and contacts the battery cells of the battery module to cool the battery cells. The electrical components are used to connect the battery module to the external power supply and power consumption system. The bottom guard plate is connected to the bottom end of the lower shell to protect the bottom end of the battery pack.

[0003] In order to obtain the right battery pack performance, some battery packs use bottom cooling to arrange the cold plate. The cold plate will be set at the bottom of the lower shell and connected to the bottom of the battery cell inside the battery pack. In addition to lowering the overall center of gravity of the battery pack, this setting can also improve the heat dissipation effect of the battery pack by using the heat sink effect. Hot air rises and cold air sinks. The heat generated by the battery cell when working is naturally dissipated upward, and the cold plate does not block the rise of heat. The battery cell can fully contact the cold plate through the bottom to achieve a cooling effect, thereby achieving better thermal management.

[0004] However, when the cold plate is arranged at the bottom of the battery pack and the bottom of the battery pack is impacted, if the bottom guard plate is deformed, it may directly impact the cold plate. The structural rigidity of the cold plate is limited, and when impacted, the cold plate may be damaged and leak, resulting in poor impact resistance of the battery pack and affecting the safety of the battery pack. Utility Model Content

[0005] In view of this, the present invention aims to provide a battery pack to improve the safety of the battery pack.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A battery pack, comprising:

[0008] a lower shell, including two side beams;

[0009] A cold plate assembly, fixedly connected to the bottom ends of the two side beams;

[0010] A first cold plate reinforcement member is fixedly connected to the bottom surface of the cold plate assembly, and each of the side beams is equipped with a first cold plate reinforcement member;

[0011] In the vertical direction, the first cold plate reinforcement at least partially overlaps with the inner edge of the bottom end of the side beam, thereby forming a force transmission between the first cold plate reinforcement and the side beam.

[0012] Furthermore, the overlapping length d between the first cold plate reinforcement and the side beam in the vertical direction is ≥10 mm.

[0013] Furthermore, the first cold plate reinforcement is glued to the cold plate assembly.

[0014] Furthermore, the first cold plate reinforcement member at least partially conforms to the bottom surface of the cold plate assembly.

[0015] Furthermore, the battery pack also includes a plurality of battery cells attached to the cold plate assembly, a heat conductive structural adhesive layer is filled between the battery cells and the cold plate assembly, and an avoidance distance is provided between the heat conductive structural adhesive layer and the ends of the battery cells having poles.

[0016] Furthermore, the avoidance distance D is ≥ 10 mm.

[0017] Furthermore, the coverage length of the thermally conductive structural adhesive layer in the direction of the length L of the battery cell is 0.9×(L-2×D)≤W≤L-2×D.

[0018] Furthermore, a blocking foam is sandwiched between the cold plate assembly and the battery cell, and the blocking foam limits the heat-conducting structural adhesive layer in the length direction of the battery cell.

[0019] Furthermore, the lower shell includes at least one longitudinal beam arranged between the two side beams, and a second cold plate reinforcement is fixedly connected to the bottom end of the cold plate assembly; in the vertical direction, the second cold plate reinforcement at least partially overlaps with the side edge of the bottom end of the longitudinal beam.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] The battery pack described in the utility model can enhance the overall rigidity of the cold plate assembly by arranging the first cold plate reinforcement at the bottom of the cold plate assembly; when the cold plate assembly of the ordinary battery pack is subjected to an upward impact, the cold plate assembly will be subjected to a large shear force at the inner edge of the side beam and is easily damaged, while in the utility model, the first cold plate reinforcement and the side beam partially overlap in the vertical direction, and when the bottom of the battery pack is subjected to an impact, the first cold plate reinforcement can directly transfer part of the force upward through the cold plate assembly to the lower shell body, thereby reducing the shear force on the cold plate assembly, and the cold plate assembly is not easily damaged, thereby improving the impact resistance of the battery pack, optimizing the structural strength and modal retention of the battery pack, and thus improving the safety of the installation pack; the first cold plate reinforcement is respectively arranged at each side beam, which can achieve structural reinforcement of the battery pack with fewer structures, which is beneficial to the lightweight of the battery pack.

[0022] The overlapping length of the first cold plate reinforcement member and the side beam is not less than 10 mm, so that the first cold plate reinforcement member can have a better reinforcement effect on the cold plate assembly.

[0023] The first cold plate reinforcement member and the cold plate assembly are connected by gluing, which has a simple processing technology and is easy to operate, and also makes the connection area between the first cold plate reinforcement member and the cold plate assembly larger.

[0024] The first cold plate reinforcement is at least partially shaped to conform to the bottom surface of the cold plate assembly, which can increase the connection area between the first cold plate reinforcement and the cold plate assembly, improve the connection strength between the two, and make the overall rigidity of the battery pack higher.

[0025] Multiple battery cells can be stably connected to the cold plate assembly through the thermally conductive structural adhesive layer. At the same time, the heat of the battery cells can be quickly transferred to the cold plate assembly through the thermally conductive structural adhesive layer, thereby improving the cooling effect of the cold plate assembly on the battery cells. An avoidance distance is set between the thermally conductive structural adhesive layer and the end of the battery cell with the pole, which can avoid the weld at the end of the battery cell, making the end of the battery cell less likely to be squeezed and damaged and leaking, thereby improving the safety of the battery pack.

[0026] Setting the avoidance distance to be greater than 10 mm can ensure that the end weld of the battery cell is given space.

[0027] The coverage length of the thermal conductive structural adhesive layer in the length direction of the battery cell is 0.9×(L-2×D)≤W≤L-2×D, which can ensure a stable connection between the battery cell and the thermal conductive structural adhesive layer, and the battery cell is not easy to fall off from the cold plate assembly.

[0028] The adhesive blocking foam can be provided to limit the edge of the thermal conductive structural adhesive layer, thereby preventing the thermal conductive structural adhesive layer from overflowing outside the end of the battery cell during coating.

[0029] When a longitudinal beam is provided on the lower shell, the second cold plate reinforcement member can be provided to structurally reinforce the position of the cold plate assembly below the longitudinal beam, thereby improving the structural strength of the cold plate assembly and further improving the overall rigidity of the battery pack.

[0030] Another object of the present invention is to provide an electrical device equipped with the battery pack as described above.

[0031] The electrical device described in the present invention has the same beneficial effects as the battery pack described above relative to the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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:

[0033] Figure 1 It is a partial structural exploded diagram of a battery pack according to a first embodiment of the utility model;

[0034] Figure 2 This is a bottom view of a battery pack according to Embodiment 1 of the present utility model;

[0035] Figure 3 for Figure 2 Sectional view in the AA direction;

[0036] Figure 4 for Figure 3 A partial enlarged view of part B in the middle;

[0037] Figure 5 for Figure 3 A partial enlarged view of the middle C part;

[0038] Figure 6 This is a schematic diagram of the structure of a battery cell in Embodiment 1 of the present utility model;

[0039] Figure 7 This is a schematic diagram of the connection between a battery cell and a heat-conducting structural adhesive layer according to a first embodiment of the utility model.

[0040] Description of reference numerals:

[0041] 1. Lower shell;

[0042] 101, side beam; 102, longitudinal beam; 103, front beam; 104, rear beam; 105, cross beam;

[0043] 2. Cold plate assembly;

[0044] 201, plane plate; 202, flow channel plate;

[0045] 3. First cold plate reinforcement;

[0046] 4. Battery module;

[0047] 401. Battery cell;

[0048] 5. Thermal conductive structural adhesive layer;

[0049] 6. Adhesive-blocking foam;

[0050] 7. Second cold plate reinforcement plate. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] 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.

[0054] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0055] Embodiment 1

[0056] The present embodiment relates to a battery pack, which optimizes the structure of the lower shell when the cold plate assembly is located at the bottom of the battery pack, so as to improve the impact resistance of the battery pack and further enhance the safety of the battery pack.

[0057] In terms of overall structure, a battery pack in this embodiment includes:

[0058] The lower shell 1 includes two side beams 101 .

[0059] The cold plate assembly 2 is fixedly connected to the bottom ends of the two side beams 101 .

[0060] The first cold plate reinforcement member 3 is fixedly connected to the bottom surface of the cold plate assembly 2 , and each side beam 101 is equipped with a first cold plate reinforcement member 3 .

[0061] In the vertical direction, the first cold plate reinforcement member 3 at least partially overlaps with the inner edge of the bottom end of the side beam 101 , thereby forming a force transmission between the first cold plate reinforcement member 3 and the side beam 101 .

[0062] As configured above, the battery pack described in this embodiment can enhance the overall rigidity of the cold plate assembly 2 by providing the first cold plate reinforcement 3 at the bottom of the cold plate assembly 2. When the cold plate assembly 2 of an ordinary battery pack is subjected to an upward impact, the cold plate assembly 2 will be subjected to a large shear force at the inner edge of the side beam 101, and it is easy to be damaged. In this embodiment, the first cold plate reinforcement 3 partially overlaps with the side beam 101 in the vertical direction. When the bottom of the battery pack is impacted, the first cold plate reinforcement 3 can directly transfer part of the force upward through the cold plate assembly 2 to the lower shell 1, reducing the shear force on the cold plate assembly 2. The cold plate assembly 2 is not easily damaged, which improves the impact resistance of the battery pack, optimizes the structural strength and modal retention of the battery pack, and thus improves the safety of the installation pack. The first cold plate reinforcement 3 is respectively provided at each side beam 101, which can achieve structural reinforcement of the battery pack with less structure, which is conducive to the lightweight of the battery pack.

[0063] Based on the above overall introduction, refer to Figures 1 to 7 As shown, specifically, the lower shell 1 of this embodiment includes side beams 101, front beams 103, rear beams 104 and cross beams 105. The two side beams 101 are connected to a front beam 103 and a rear beam 104 to form a rectangular frame. There are multiple cross beams 105 from front to back, which are welded between the two side beams 101 and are mainly used to install the battery module 4 and electrical parts. The cold plate assembly 2 is welded to the bottom end of the lower shell 1 to close the lower opening of the lower shell 1. The battery module 4 is installed in the lower shell 1 and has a plurality of battery cells 401 arranged in sequence. The bottom end of each battery cell 401 is attached to the cold plate assembly 2, so that the cold plate assembly 2 can cool the battery cell 401. The first cold plate reinforcement 3 reinforces the position of the cold plate assembly 2 corresponding to the edge of the side beam 101, so that the cold plate assembly 2 is not easily deformed and damaged when impacted, so as to ensure the normal use of the battery pack.

[0064] For the connection method between the first cold plate reinforcement 3 and the cold plate assembly 2, refer to Figures 2 to 4 As shown, in this embodiment, the first cold plate reinforcement 3 is glued to the cold plate assembly 2. The first cold plate reinforcement 3 and the cold plate assembly 2 are glued together, which has a simple processing technology and is easy to operate. At the same time, it also makes the connection area between the first cold plate reinforcement 3 and the cold plate assembly 2 larger. The type of glue between the first cold plate reinforcement 3 and the cold plate assembly 2 can be a thermally conductive structural glue, which can provide better bonding force between the first cold plate reinforcement 3 and the cold plate assembly 2. Secondly, the thermally conductive structural glue has good thermal conductivity. In actual use, it can balance the temperature of the first cold plate reinforcement 3 and the cold plate assembly 2, which is beneficial to the overall heat dissipation of the battery pack. Specifically, the thermally conductive structural glue can adopt a polyurethane structural glue, which has the advantages of high strength, good toughness, durable bonding, and high thermal conductivity, and is more suitable for use.

[0065] It should be noted that, in addition to the adhesive connection, the first cold plate reinforcement 3 and the cold plate assembly 2 can also be connected by bolt connection, welding, riveting, etc., as long as they can firmly fix the first cold plate reinforcement 3 on the cold plate assembly 2, and there are no other restrictions.

[0066] In order to strengthen the connection strength between the first cold plate reinforcement member 3 and the cold plate assembly 2, the first cold plate reinforcement member 3 is at least partially shaped to conform to the bottom surface of the cold plate assembly 2. The first cold plate reinforcement member 3 is at least partially shaped to conform to the bottom surface of the cold plate assembly 2, which can increase the connection area between the first cold plate reinforcement member 3 and the cold plate assembly 2, improve the connection strength between the two, and make the overall rigidity of the battery pack higher.

[0067] Specifically, the cold plate assembly 2 includes a plane plate 201 and a flow channel plate 202, the plane plate 201 is at the top, the flow channel plate 202 is at the bottom, and the plane plate 201 and the flow channel plate 202 are fixedly connected to form a cold plate with a liquid cooling flow channel. The battery cell 401 is connected to the upper surface of the plane plate 201. The first cold plate reinforcement 3 is in the shape of a long strip, and the longitudinal section is "Z"-shaped. The top end is bonded to the bottom end of the flow channel plate 202 and overlaps with the side beam 101 in the vertical direction; the middle bend is bonded to the flow channel plate 202 and follows the outer wall of the flow channel provided on the flow channel plate 202; the upper surface of the bottom end is bonded to the bottom surface of the flow channel plate 202. Through such an arrangement, the contact area between the first cold plate reinforcement 3 and the flow channel plate 202 is larger, and the connection is tighter. When the bottom of the battery pack is impacted, the force can be better transmitted to the side beam 101, thereby improving the overall stiffness of the battery pack.

[0068] In order to enable better force transmission between the first cold plate reinforcement 3 and the side beam 101, the overlapping length d of the first cold plate reinforcement 3 and the side beam 101 in the vertical direction is ≥10mm. The size of the overlapping length d directly affects the force transmission effect of the first cold plate reinforcement 3. When the overlapping length d is less than 10mm, the vertical force transmission area of ​​the first cold plate reinforcement plate is too small, and the reinforcement effect is poor. If only the reinforcement effect of the first cold plate reinforcement plate is considered, the larger the value of the overlapping length d, the better the effect. However, in the specific implementation, the weight and installation process of the first cold plate reinforcement plate must also be considered, and the value of the overlapping length d needs to be determined according to the actual situation.

[0069] In order to increase the energy density of a current battery pack, at least two battery modules 4 are usually arranged in the battery pack. Figure 1 , Figure 3 and Figure 5, correspondingly, the lower shell 1 includes at least one longitudinal beam 102 arranged between the two side beams 101, and a second cold plate reinforcement is fixedly connected to the bottom end of the cold plate assembly 2. In the vertical direction, the second cold plate reinforcement overlaps at least partially with the side edge of the bottom end of the longitudinal beam 102. The second cold plate reinforcement can structurally reinforce the position of the cold plate assembly 2 below the longitudinal beam 102, improve the structural strength of the cold plate assembly 2, and thus improve the overall rigidity of the battery pack.

[0070] Specifically, in this embodiment, the number of longitudinal beams 102 is one, which is welded to all cross beams 105, and the space in the lower shell 1 is evenly divided on both sides thereof. The space on both sides after the equal division is used to accommodate the battery module 4. The battery module 4 is not in contact with the longitudinal beam 102, and the cold plate assembly 2 is connected to the bottom end of the longitudinal beam 102. Both ends of the second cold plate reinforcement in the extension direction of the cross beam 105 extend to the bottom of the corresponding battery cell 401, which can protect the battery cell 401 when the battery pack is impacted. The second cold plate reinforcement is shaped on the outer surface of the flow channel plate 202 and is glued to the flow channel plate 202, so that the contact area between the second cold plate reinforcement plate 7 and the flow channel plate 202 is larger and the bonding strength is higher. The material of the glue is polyurethane structural glue, which has the advantages of high strength, good toughness, durable bonding, and high thermal conductivity, and is more suitable for use.

[0071] Based on the need to enhance the cooling effect of the cold plate assembly 2 on the battery cell 401, refer to Figure 1 , Figure 4 and Figure 6 , a heat-conducting structural adhesive layer 5 is filled between the battery cell 401 and the cold plate assembly 2, and an avoidance distance is provided between the heat-conducting structural adhesive layer 5 and the end of the battery cell 401 with the pole. Multiple battery cells 401 can be stably connected to the cold plate assembly 2 through the heat-conducting structural adhesive layer 5, and at the same time, the heat of the battery cell 401 can be quickly transferred to the cold plate assembly 2 through the heat-conducting structural adhesive layer 5, thereby improving the cooling effect of the cold plate assembly 2 on the battery cell 401. An avoidance distance is provided between the heat-conducting structural adhesive layer 5 and the end of the battery cell 401 with the pole, which can avoid the weld at the end of the battery cell 401, so that the end of the battery cell 401 is not easily squeezed and damaged and leaked, thereby improving the safety of the battery pack. The heat-conducting structural adhesive layer 5 can be made of polyurethane structural adhesive, which has the advantages of high strength, good toughness, durable bonding, and high thermal conductivity, and is suitable for the connection between the battery cell 401 and the cold plate in this embodiment.

[0072] Specifically, in order to effectively play the role of avoidance spacing, refer to Figure 4 and Figure 7, the avoidance spacing D ≥ 10mm, which can provide sufficient space for the end weld of the battery cell 401, so that the welding part of the battery cell 401 is not easily squeezed. Usually, the battery cells 401 are arranged in a single row one by one, with their poles located on both sides of the horizontal plane, and the bottom is connected to the cold plate assembly 2 through the thermal conductive structural adhesive layer 5. The thermal conductive structural adhesive layer 5 is a whole in the arrangement direction of the battery cell 401, and an avoidance spacing D is reserved at both ends of the length direction of the battery cell 401. Furthermore, in order to ensure the heat conduction effect between the battery cell 401 and the cold plate assembly 2, the coverage length W of the thermal conductive structural adhesive layer 5 in the length L direction of the battery cell 401 is ≥ 0.9 × (L-2 × D). When the coverage length W is less than 0.9 × (L-2 × D), the connection strength between the battery cell 401 and the cold plate assembly 2 is low, and the thermal conductivity efficiency between the two is also low, which is not conducive to the rigidity improvement and thermal management of the battery pack. In summary, the relationship that the covering length W needs to satisfy is 0.9×(L−2×D)≤W≤L−2×D, which can ensure better connection strength and heat transfer effect between the battery cell 401 and the cold plate assembly 2 .

[0073] In order to make the size of the thermal conductive structure layer more accurate, a blocking foam 6 is sandwiched between the cold plate assembly 2 and the battery cell 401, and the blocking foam 6 constitutes a limit for the thermal conductive structure adhesive layer 5 in the length direction of the battery cell 401. The setting of the blocking foam 6 can limit the edge of the thermal conductive structure adhesive layer 5, and can prevent the thermal conductive structure adhesive layer 5 from overflowing outside the end of the battery cell 401 during coating, so that the thermal conductive structure layer can be kept in the required working area, with better appearance and performance. The blocking foam 6 is compressed by the battery cell 401 and the cold plate assembly 2, and can play a supporting role between the battery cell 401 and the cold plate assembly 2, which is conducive to the molding of the thermal conductive structure adhesive layer 5 and reduces unnecessary extrusion of the thermal conductive structure adhesive layer 5.

[0074] This embodiment improves the impact resistance of the cold plate assembly 2 by providing the first cold plate reinforcement 3 and the second cold plate reinforcement, thereby increasing the overall rigidity of the battery pack. The heat conductive structural adhesive layer 5 between the battery cell 401 and the cold plate assembly 2 is structurally optimized, and on the premise of ensuring that the end weld of the battery cell 401 is not squeezed by the cold plate assembly 2, a better connection strength and cooling effect are provided between the cold plate assembly 2 and the battery cell 401.

[0075] Embodiment 2

[0076] This embodiment relates to an electrical device equipped with a battery pack as in the first embodiment.

[0077] The electrical device of this embodiment may be a device commonly used in the prior art that requires a battery pack for power supply, such as an electric vehicle, electric engineering equipment, etc. By providing the battery pack in the first embodiment, the overall rigidity and impact resistance of the electrical device can be improved, which is also beneficial to improving the safety performance of the electrical device.

[0078] 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: include: a lower shell, including two side beams; A cold plate assembly, fixedly connected to the bottom ends of the two side beams; A first cold plate reinforcement member is fixedly connected to the bottom surface of the cold plate assembly, and each of the side beams is equipped with a first cold plate reinforcement member; In the vertical direction, the first cold plate reinforcement at least partially overlaps with the inner edge of the bottom end of the side beam, thereby forming a force transmission between the first cold plate reinforcement and the side beam.

2. The battery pack according to claim 1, characterized in that: The overlapping length d of the first cold plate reinforcement and the side beam in the vertical direction is ≥10 mm.

3. The battery pack according to claim 1, characterized in that: The first cold plate reinforcement is glued to the cold plate assembly.

4. The battery pack according to claim 3, characterized in that: The first cold plate stiffener at least partially conforms to a bottom surface of the cold plate assembly.

5. The battery pack according to claim 1, characterized in that: The battery pack further comprises a plurality of battery cells attached to the cold plate assembly, a heat conductive structural adhesive layer is filled between the battery cells and the cold plate assembly, and an escape distance is provided between the heat conductive structural adhesive layer and the ends of the battery cells having poles.

6. The battery pack according to claim 5, characterized in that: The avoidance distance D is ≥ 10 mm.

7. The battery pack according to claim 6, characterized in that: The coverage length of the thermal conductive structural adhesive layer in the direction of the length L of the battery cell is 0.9×(L-2×D)≤W≤L-2×D.

8. The battery pack according to claim 5, characterized in that: A blocking foam is sandwiched between the cold plate assembly and the battery cell, and the blocking foam serves to limit the heat-conducting structural adhesive layer in the length direction of the battery cell.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The lower shell includes at least one longitudinal beam arranged between the two side beams, and a second cold plate reinforcement is fixedly connected to the bottom end of the cold plate assembly; in the vertical direction, the second cold plate reinforcement at least partially overlaps with the side edge of the bottom end of the longitudinal beam.

10. An electrical device, characterized in that: A battery pack according to any one of claims 1 to 9 is provided.

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