Battery pack and electric device

Abstract

The battery pack comprises a box body and a plurality of battery monomers arranged in the box body, the box body comprises two oppositely arranged first side beams, the length direction of the first side beam is parallel to the arrangement direction of the plurality of battery monomers; the first side beam is provided with a raised structure on the side facing the plurality of battery monomers, the raised structure has a flat part facing the plurality of battery monomers; in the height direction of the first side beam, the height of the flat part is h1 mm, the height of the first side beam is H mm, 0.2≤h1 mm / H mm≤0.4. When the first side beam is impacted by external force, the flat part in this range can better disperse the external force, avoiding the damage of the battery monomer caused by the concentration of the external force on a certain specific area of the battery monomer.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular, to a battery pack and an electrical device. Background Technology

[0002] Battery packs, used for storing and supplying electrical energy, are widely used in various devices. During use, battery packs are inevitably subjected to external forces. To ensure the stability of the individual battery cells, specific limiting structures are typically installed between the pack and the cells. However, existing limiting structures, due to their flawed design, often lead to damage to the individual battery cells. Utility Model Content

[0003] In view of this, the present disclosure provides a battery pack and an electrical device having the same, which aims to at least improve the problem of battery cell damage caused by limiting structures.

[0004] On one hand, this disclosure provides a battery pack, which includes a housing and a plurality of battery cells arranged inside the housing. The housing includes two opposing first side beams, the length direction of which is parallel to the arrangement direction of the plurality of battery cells. A raised structure is provided on the side of the first side beam facing the plurality of battery cells, and the raised structure has a flat portion facing the plurality of battery cells. In the height direction of the first side beam, the height of the flat portion is h1 mm, the height of the first side beam is H mm, and 0.2≤h1mm / Hmm≤0.4.

[0005] On the other hand, this disclosure also provides an electrical device that includes the battery pack described above.

[0006] According to the battery pack and electrical equipment provided in this disclosure, by providing a raised structure on the first side beam and a flat portion on the side of the raised structure facing multiple battery cells, the height h1mm of the flat portion and the height Hmm of the first side beam satisfy: 0.2≤h1mm / Hmm≤0.4. When the first side beam is impacted by an external force, the flat portion within this range can better disperse the external force, preventing the external force from concentrating on a specific area of ​​the battery cell 20 and causing damage to the battery cell 20. Attached Figure Description

[0007] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0008] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0009] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0010] Figure 1 This is a schematic diagram of an exemplary battery pack.

[0011] Figure 2 for Figure 1 The diagram shows the structure of the battery pack from one perspective.

[0012] Figure 3 for Figure 2 Cross-sectional view along the AA direction.

[0013] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0014] Figure 5 This is a schematic diagram of the relevant dimensions in the first side beam.

[0015] Explanation of reference numerals in the attached drawings: 100, battery pack; 10, housing; 11, first side beam; 12, second side beam; 13, raised structure; 131, flat section; 132, transition section; 133, support rib; 20, battery cell; 30, bottom plate; 40, buffer structure. Detailed Implementation

[0016] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0017] In related technologies, due to the fixed installation method of battery packs in vehicles and other electrical equipment, battery packs are often subjected to lateral force impacts. This lateral force can be understood as a force parallel to the width direction of the battery pack. This lateral force acts directly on the side beams extending along the length direction of the battery pack.

[0018] To prevent battery cells from shaking violently under lateral force impact, a specific restraining structure is typically installed between the first side beam and the battery cell. However, the restraining structures used in existing technology are relatively small. When the first side beam is impacted by a lateral force, the restraining structure transmits this force towards the battery cell. However, due to its small size, the transmitted force is concentrated in the corresponding area of ​​the battery cell, causing damage to that area due to excessive pressure or impact.

[0019] The inventors discovered that the reason for the above problems is that the limiting structure in the prior art is too small, which causes the force transmitted to be too concentrated.

[0020] To address the aforementioned problems, the inventors made numerous attempts and ultimately creatively proposed the following technical solution: By setting a raised structure on the first side beam and a flat portion on the side of the raised structure facing multiple battery cells, the height h1mm of the flat portion and the height Hmm of the first side beam satisfy: 0.2≤h1mm / Hmm≤0.4. When the first side beam is impacted by an external force, the flat portion within this range can better disperse the external force, preventing the external force from concentrating on a specific area of ​​the battery cell and causing damage to the battery cell.

[0021] The battery pack described in this disclosure includes a battery pack composed of multiple battery cells connected in series and / or in parallel to form a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (shell, brackets, etc.), and protective components, etc., and the above components are placed in a box and sealed with a cover plate to form a complete functional unit that can directly output electrical energy.

[0022] The aforementioned enclosure refers to a closed or semi-closed structure made of metals such as steel plates or aluminum alloys, or lightweight materials such as plastics, glass fiber reinforced composites, or carbon fiber reinforced composites. It serves as the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The enclosure provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through a reasonable structural design, fixes these components within the enclosure, ensuring they maintain a relatively stable position during battery pack operation and preventing damage or loosening of connections due to vibration, impact, or other factors.

[0023] The enclosure typically consists of an upper enclosure and a lower enclosure. The lower enclosure generally has four side panels and a bottom panel. The four side panels can be integrally formed with the bottom panel or formed separately and fixedly connected. The shape of the enclosure can be cylindrical, cuboid, cube, etc.

[0024] The aforementioned battery cell refers to a battery that can store chemical energy and controllably convert it into electrical energy. In recyclable batteries, the active materials can be reactivated by charging after discharge, allowing for continued use. A battery cell typically includes a casing and a battery cell housed within the casing.

[0025] <Example Battery Pack> This disclosure provides a battery pack, which includes a housing 10 and a plurality of battery cells 20. The plurality of battery cells 20 are arranged inside the housing 10. The housing 10 includes two opposing first side beams 11, the length direction of which is parallel to the arrangement direction of the plurality of battery cells 20. A raised structure 13 is provided on the side of the first side beam 11 facing the plurality of battery cells 20. The raised structure 13 has a flat portion 131 facing the plurality of battery cells 20. In the height direction of the first side beam 11, the height of the flat portion 131 is h1 mm, the height of the first side beam 11 is H mm, and 0.2≤h1mm / Hmm≤0.4.

[0026] For ease of understanding, the battery pack described above will be explained in detail below with reference to the accompanying drawings. In the drawings, the X-axis indicates the length direction of the battery pack 100, which is also the arrangement direction of the multiple battery cells 20, and the length direction of the first side beam 11; the Y-axis indicates the width direction of the battery pack 100; and the Z-axis indicates the height direction of the battery pack 100, which is also the height direction of the first side beam 11.

[0027] First see Figure 1 and Figure 2 The battery pack 100 includes a housing 10 and multiple battery cells 20. The housing 10 generally consists of an upper housing and a lower housing, which are fitted together to form a receiving space in which the multiple battery cells 20 are installed. The housing 10 can be cast from materials such as steel plate or aluminum alloy, or it can be made of lightweight materials, such as glass fiber reinforced composite materials or carbon fiber reinforced composite materials. The shape of the housing 10 can be cylindrical, cuboid, or cube.

[0028] For ease of explanation, only the lower housing is shown in the views presented here, and the upper housing is not shown. However, this does not mean that the battery pack disclosed herein does not include an upper housing structure. The following description will use a cuboid shape for housing 10 as an example: As shown in the figure, the box body 10 includes two oppositely arranged first side beams 11 and two oppositely arranged second side beams 12, as well as a base plate 30. The two first side beams 11 and the two second side beams 12 are connected end to end to form the frame of the box body 10. The frame can be integrally formed with the base plate 30 around the periphery, or it can be formed by separate fixed connection.

[0029] See also Figures 3 to 5 The specific structure of the raised structure 13 will be described in detail below: As shown in the figure, the raised structure 13 is disposed on the side of the first side beam 11 facing the multiple battery cells 20, that is, the raised structure 13 is located inside the housing 10. This reduces the space between the first side beam 11 and the multiple battery cells 20, thus providing a certain degree of restraint for the multiple battery cells 20. When the first side beam 11 is subjected to a lateral force impact, the restraining effect of the raised structure 13 effectively reduces the risk of violent shaking of the multiple battery cells 20, ensuring the safety of the battery pack 100 during use.

[0030] The raised structure 13 is provided with a flat portion 131, and the flat portion 131 is oriented toward the plurality of battery cells 20. For example, it can be understood that the surface of the flat portion 131 facing the plurality of battery cells 20 is a plane. The flat portion 131 extends a certain distance at the height of the first side beam 11, such that the height of the flat portion 131 is h1 mm. h1 can also be understood as the dimension of the aforementioned plane in the height direction of the first side beam 11.

[0031] The height of the first side beam 11 is H mm. The relationship between h1 mm and H mm is satisfied: 0.2 ≤ h1 / H ≤ 0.4. This ensures that the flat portion 131 has a sufficiently large dimension in the height direction of the first side beam 11. When the first side beam 11 is impacted by a lateral force, the lateral force is evenly distributed on the flat portion 131. Furthermore, when the flat portion 131 continues to transmit this lateral force inward, it also distributes the force across multiple battery cells 20. This prevents the transmitted force from being excessively concentrated in a single area of ​​the battery cell 20, which could damage the battery cell 20. Additionally, h1, while meeting the above range, will not be too large, avoiding excessive increase in the weight or volume of the housing 10, which could adversely affect the energy density of the battery pack 100.

[0032] Optionally, the h1 / H ratio can be 0.2, 0.25, 0.28, 0.3, 0.32, 0.36, 0.38, or 0.4, etc. In use, the h1mm / Hmm ratio can be adaptively adjusted according to factors such as the height of the first side beam 11 and the height of the battery cell 20, and is not limited to the ratios listed above.

[0033] Wherein, 22mm≤h1mm≤35mm, 80mm≤Hmm≤120mm. The value of h1mm can be 22mm, 25mm, 26mm, 28mm, 30mm, 32mm, or 35mm, etc. The value of Hmm can be 80mm, 85mm, 90mm, 95mm, 100mm, 110mm, or 120mm, etc.

[0034] See also Figure 5The raised structure 13 also includes a transition portion 132, and the transition portion 132 and the flat portion 131 are arranged along the height of the first side beam 11. This arrangement increases the dimension of the raised structure 13 in the height direction of the first side beam 11, thus increasing the overall height of the raised structure 13. When the first side beam 11 is subjected to a lateral force impact, both the flat portion 131 and the transition portion 132 can be used to disperse the lateral force and increase the force dispersion area. Ultimately, the force transmitted to each area of ​​the battery cell 20 is further abreasted, further improving the safety of the battery cell 20.

[0035] It should be noted that the extension dimensions of the transition portion 132 and the flat portion 131 on the first side beam 11 should be controlled to avoid the overall height of the raised structure 13 being too large. The overall height of the raised structure 13 should be less than the height of the first side beam 11.

[0036] Preferably, the transition portion 132 is an arc surface, and the arc surface smoothly transitions between the flat portion 131 and the first side beam 11. Setting the transition portion 132 as an arc surface ensures that the junction between the transition portion 132 and the flat portion 131 is a smooth structure, meaning there are no sharp edges at the junction. When multiple battery cells 20 are assembled with the housing 10, this better protects the battery cells 20 and prevents sharp edges from scratching them.

[0037] As an optional implementation, in the height direction of the first side beam 11, the transition portion 132 is located above the flat portion 131. This can be understood as the transition portion 132 being closer to the opening end of the housing 10 than the flat portion 131. A cavity with a "larger top and smaller bottom" shape is formed between the raised structure 13 and the multiple battery cells 20. When liquid substances such as colloids are poured into this cavity through the opening end of the housing 10, the larger upper part of the cavity facilitates the flow of the colloids, improving the operability and convenience of the potting process.

[0038] Meanwhile, when multiple battery cells 20 are placed inside the housing 10 through the opening end of the housing 10, the transition portion 132 is located above the flat portion 131, which can better protect the battery cells 20 and prevent the flat portion 131 from scratching the battery cells 20.

[0039] Optionally, the transition portion 132 and the flat portion 131 are integrally formed. On the one hand, this can improve the stability between the transition portion 132 and the flat portion 131, and prevent cracking due to stress concentration at the connection point under external impact. On the other hand, integral forming can also avoid the formation of sharp structures such as burrs or weld points between the transition portion 132 and the flat portion 131 due to the connection, further avoiding the risk of the battery cell 20 being scratched.

[0040] In one optional embodiment, the height of the raised structure 13 in the height direction of the first side beam 11 is h2mm, where 0.55≤h2mm / Hmm≤0.85. A h2mm within this range effectively disperses the lateral force on the first side beam 11, preventing the lateral force from concentrating on a specific area of ​​the battery cell 20. Furthermore, a h2mm within this range does not additionally increase the height dimension of the battery pack 100, avoiding excessive increase in the weight or volume of the housing 10, which could adversely affect the energy density of the battery pack 100.

[0041] The h2 / H ratio can be 0.55, 0.6, 0.65, 0.7, 0.76, 0.8, or 0.85, etc. In use, the h2 / H ratio can be adaptively adjusted according to factors such as the height of the first side beam 11 and the height of the battery cell 20, and is not limited to the ratios listed above.

[0042] Wherein, 55mm≤h2mm≤70mm. The value of h2mm can be 55mm, 58mm, 60mm, 62mm, 65mm, 68mm or 70mm, etc.

[0043] like Figure 4 As shown, a buffer structure 40 is provided between the raised structure 13 and the multiple battery cells 20. It can be understood that the buffer structure 40 has good flexibility. When the first side beam 11 is impacted by a lateral force, the buffer structure 40 can absorb part of the force through deformation, thereby reducing the force transmitted to the battery cells 20. Simultaneously, the buffer structure 40 can also play a certain role in shock absorption, better protecting the battery cells 20. Finally, the buffer structure 40 can fill the space between the multiple battery cells 20 and the raised structure 13, further limiting the battery cells 20 and preventing them from displacing under the influence of external forces.

[0044] Preferably, the buffer structure 40 can be a self-foaming filler such as expanded polystyrene foam to more fully fill the space between the multiple battery cells 20 and the raised structure 13. Of course, the buffer structure 40 can also be made of other filler materials with buffering effect, and is not limited to expanded polystyrene foam.

[0045] like Figure 5As shown, in the height direction of the first side beam 11, the height of the raised structure 13 is h2 mm, and the height of the buffer structure 40 is h3 mm, where h2 mm < h3 mm < H mm. Both h2 mm and h3 mm are smaller than the height of the first side beam 11, so the raised structure 13 and buffer structure 40 will not add extra dimensions to the battery pack 100 in the height direction, thus avoiding any adverse effect on the energy density of the battery pack 100. At the same time, making h3 mm greater than h2 mm ensures that multiple battery cells 20 always only contact the buffer structure 40, preventing multiple battery cells 20 from contacting the raised structure 13, which has higher rigidity and could lead to damage to the battery cells 20.

[0046] Optionally, 56mm ≤ h3mm ≤ 75mm. The value of h3mm can be 56mm, 60mm, 62mm, 65mm, 68mm, 70mm, or 75mm, etc. In use, the value of h3mm can be determined comprehensively based on factors such as the height of the raised structure 13 and the height of the battery cell 20, and is not limited to the heights listed above.

[0047] In one alternative embodiment, the orthographic projection of the raised structure 13 onto the first side beam 11 is located in the central region of the corresponding surface of the first side beam 11. When the first side beam 11 is impacted by a lateral force, the lateral force can be more effectively transmitted to the raised structure 13 and evenly distributed across various regions of the raised structure 13. This avoids the lateral force being excessively concentrated in a particular region of the raised structure 13, and to some extent reduces the possibility of the lateral force being concentrated in a particular region of the battery cell 20.

[0048] In one alternative embodiment, the orthographic projection of the raised structure 13 onto the plurality of battery cells 20 is located at the lower part of the plurality of battery cells 20. When the first side beam 11 is impacted by a lateral force, the lateral force is transmitted through the raised structure 13 in a direction closer to the plurality of battery cells 20. Since the orthographic projection of the raised structure 13 onto the plurality of battery cells 20 is located at the lower part of the plurality of battery cells 20, the raised structure 13 can transmit more of this lateral force to the lower part of the plurality of battery cells 20. Because the lower part of the battery cell 20 has better strength and support than other parts of the battery cell 20, the risk of damage to the battery cell 20 can be greatly reduced, significantly improving the safety performance of the battery pack 100 during use.

[0049] In an optional embodiment, the raised structure 13 further includes a support rib 133 located inside the raised structure 13, with one end of the support rib 133 resting on the flat portion 131 and the other end resting on the first side beam 11. It is understood that the raised structure 13 is configured as a hollow structure to achieve weight reduction of the battery pack 100. Providing the support rib 133 inside the raised structure 13 can improve the strength of the raised structure 13, thereby improving its resistance to deformation, so as to better protect the multiple battery cells 20.

[0050] Furthermore, one end of the support rib 133 is located on the flat portion 131, which can transmit the lateral force on the first side beam 11 toward the multiple battery cells 20, so that the force can be better distributed and transmitted to the multiple battery cells 20.

[0051] like Figure 4 As shown, in one optional embodiment, the support rib 133 is inclined, and the inclination direction of the support rib 133 is: inclined from one end located on the first side beam 11 to one end located on the flat portion 131. When the first side beam 11 is impacted by a lateral force, the lateral force is transmitted along the support rib 133 towards the lower part of the battery cell 20. In this way, the lateral force can act as much as possible on the part near the battery cell 20 and close to the bottom plate 30. Since this part has better strength and support than other parts of the battery cell 20, the risk of damage to the battery cell 20 can be greatly reduced, and the safety performance of the battery pack 100 during use can be improved.

[0052] Furthermore, such as Figure 5 As shown, in the height direction of the first side beam 11, the distance between the end of the support rib 133 located on the flat portion 131 and the bottom surface of the plurality of battery cells 20 is h4mm, and the height of each battery cell 20 is h5mm, where h4mm ≤ 1 / 3 h5mm. That is, when a lateral force on the first side beam 11 is transmitted along the support rib 133 towards the lower part of the battery cell 20, the area of ​​action of this force on the battery cell 20 is basically concentrated in the area near the lower 1 / 3 of the battery cell 20. This part has better strength and support, which can greatly reduce the risk of damage to the battery cell 20.

[0053] Wherein, 15mm ≤ h4mm ≤ 25mm, and 90mm ≤ h5mm ≤ 110mm. The value of h4mm can be 15mm, 18mm, 20mm, 21mm, 22mm, 24mm, or 25mm, etc. The value of h5mm can be 90mm, 95mm, 98mm, 100mm, 105mm, 108mm, or 110mm, etc.

[0054] See also Figure 5 In one optional embodiment, in the height direction of the first side beam 11, the height of the raised structure 13 is h2mm, and the distance between the end of the support rib 133 located on the first side beam 11 and the bottom surface of the raised structure 13 is h6mm, where 1 / 3 h2mm ≤ h6mm ≤ 2 / 3 h2mm. That is, the end of the support rib 133 located on the first side beam 11 is essentially in the central region of the raised structure 13 on the side closest to the first side beam 11, thereby enabling the lateral force on the first side beam 11 to be transmitted more evenly to the raised structure 13. In other words, the force difference at various locations on the raised structure 13 is small, further preventing the lateral force from concentrating in a specific area of ​​the battery cell 20.

[0055] Wherein, 20mm≤h6mm≤30mm. The value of h6mm can be 20mm, 22mm, 24mm, 25mm, 26mm, 28mm or 30mm, etc.

[0056] <Example Electrical Equipment> This disclosure also provides an electrical device that includes the battery pack described above. This electrical device can be, for example, a vehicle, a ship, an aircraft, a household appliance, industrial equipment, or an energy storage device. The vehicle can be, for example, a passenger car, a truck, or a construction vehicle.

[0057] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0058] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part is not intended to exclude other components or parts.

[0059] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as the first side beam and the second side beam), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0060] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0061] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, It includes a housing (10) and multiple battery cells (20), the multiple battery cells (20) are arranged inside the housing (10), the housing (10) includes two opposing first side beams (11), the length direction of the first side beams (11) is parallel to the arrangement direction of the multiple battery cells (20); The first side beam (11) has a raised structure (13) on the side facing the plurality of battery cells (20), and the raised structure (13) has a flat portion (131) facing the plurality of battery cells (20). In the height direction of the first side beam (11), the height of the flat part (131) is h1 mm, the height of the first side beam (11) is H mm, and 0.2≤h1mm / Hmm≤0.

4.

2. The battery pack as described in claim 1, characterized in that, 22mm≤h1mm≤35mm, and / or, 80mm≤Hmm≤120mm.

3. The battery pack as described in claim 1, characterized in that, The raised structure (13) also includes a transition section (132), which and the flat section (131) are arranged along the height of the first side beam (11).

4. The battery pack as described in claim 3, characterized in that, The transition portion (132) is an arc surface, and the arc surface smoothly transitions between the flat portion (131) and the first side beam (11).

5. The battery pack as described in claim 4, characterized in that, In the height direction of the first side beam (11), the transition portion (132) is located above the flat portion (131).

6. The battery pack as described in claim 3, characterized in that, The transition portion (132) and the flat portion (131) are integrally formed structures.

7. The battery pack as described in claim 3, characterized in that, In the height direction of the first side beam (11), the height of the raised structure (13) is h2 mm, 0.55≤h2mm / Hmm≤0.

85.

8. The battery pack as described in claim 7, characterized in that, 55mm≤h2mm≤70mm, and / or, 80mm≤Hmm≤120mm.

9. The battery pack as described in claim 3, characterized in that, A buffer structure (40) is provided between the raised structure (13) and the plurality of battery cells (20).

10. The battery pack as claimed in claim 9, characterized in that, The buffer structure (40) is a foamed filler.

11. The battery pack as claimed in claim 9, characterized in that, In the height direction of the first side beam (11), the height of the raised structure (13) is h2 mm, the height of the buffer structure (40) is h3 mm, and h2 mm < h3 mm < H mm.

12. The battery pack as claimed in claim 11, characterized in that, 56mm≤h3mm≤75mm, and / or 55mm≤h2mm≤70mm, and / or 80mm≤Hmm≤120mm.

13. The battery pack as claimed in claim 11, characterized in that, The orthographic projection of the raised structure (13) onto the first side beam (11) is located in the central region of the corresponding surface of the first side beam (11).

14. The battery pack as claimed in claim 1, characterized in that, The orthographic projection of the raised structure (13) onto the plurality of battery cells (20) is located at the lower part of the plurality of battery cells (20).

15. The battery pack as claimed in claim 6, characterized in that, The raised structure (13) further includes a support rib (133), which is located inside the raised structure (13), with one end of the support rib (133) located on the flat portion (131) and the other end of the support rib (133) located on the first side beam (11).

16. The battery pack as claimed in claim 15, characterized in that, The support rib (133) is inclined, and the inclination direction of the support rib (133) is: from one end located on the first side beam (11) to one end located on the flat part (131).

17. The battery pack as claimed in claim 16, characterized in that, In the height direction of the first side beam (11), the distance between the end of the support rib (133) located on the flat part (131) and the bottom surface of the plurality of battery cells (20) is h4 mm, and the height of each battery cell (20) in the plurality of battery cells (20) is h5 mm, h4 mm ≤ 1 / 3 h5 mm.

18. The battery pack as claimed in claim 17, characterized in that, 15mm≤h4mm≤25mm, and / or, 90mm≤h5mm≤110mm.

19. The battery pack as claimed in claim 16, characterized in that, In the height direction of the first side beam (11), the height of the raised structure (13) is h2 mm, and the distance between the end of the support rib (133) located on the first side beam (11) and the bottom surface of the raised structure (13) is h6 mm, 1 / 3 h2mm≤h6mm≤2 / 3 h2mm.

20. The battery pack as claimed in claim 19, characterized in that, 20mm≤h6mm≤30mm, and / or, 55mm≤h2mm≤70mm.

21. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-20.

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