Battery pack and electric device

Abstract

The application provides a battery pack and an electric device, and relates to the technical field of batteries. The battery pack comprises a box body, a battery module and a filler. The box body comprises box side walls oppositely arranged along a first direction. The battery module is arranged in the box body. The battery module comprises a plurality of battery monomers arranged in sequence along the first direction. The filler is arranged between two adjacent battery monomers along the first direction and / or between the battery monomer and the box side wall. The filler has a compressed state in a vacuum state and an expanded state in a state of losing the vacuum. When the filler is in the expanded state, the two side surfaces of the filler in the first direction respectively abut against the side surfaces of the two adjacent battery monomers and / or respectively abut against the side surfaces of the battery monomer and the box side wall. The overall thickness of the filler in the compressed state is relatively small, so that the filler can be conveniently arranged in the gap. The state of losing the vacuum causes the filler to naturally expand to accurately fill the gap, thereby improving the adaptability of the filler and the assembly efficiency of the battery pack.

Description

Technical Field

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

[0002] In recent years, with the booming development of the new energy vehicle market, consumers' demand for energy-saving and environmentally friendly new energy travel modes has been increasing. As a core component of new energy vehicles, the technological advancement and cost control of power batteries have become the focus of the industry.

[0003] In related technologies, during the assembly of battery packs, battery modules are usually placed inside the housing by hoisting or gripping with a robotic arm. However, due to the positional tolerance of the robotic arm itself and the tolerance between the battery module and the housing, the gap between the battery module and the adjacent side wall of the housing will vary in size after the battery module is placed inside the housing. This results in different specifications of filler material in the gap, requiring the use of multiple filler materials of different specifications. This not only increases production costs but also reduces battery production efficiency and assembly quality. Utility Model Content

[0004] The purpose of this application is to provide a battery pack and an electrical device to solve the technical problem of low adaptability of fillers used in battery packs in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, this application provides a battery pack, comprising: a housing, a battery module, and a filler. The housing includes housing sidewalls disposed opposite each other along a first direction. The battery module is disposed within the housing and includes a plurality of battery cells stacked sequentially along the first direction. The filler is disposed between two adjacent battery cells along the first direction, and / or between a battery cell and a housing sidewall. The filler has a compressed state under vacuum and an expanded state under de-vacuum conditions. When the filler is in the expanded state, its two sides in the first direction abut against the sides of two adjacent battery cells, and / or abut against the sides of a battery cell and a housing sidewall, respectively.

[0007] In one or more embodiments of this application, when the filler is in a compressed state, along the second direction, the side of the battery cell protrudes from the side of the filler, along the third direction, the bottom of the battery cell protrudes from the bottom of the filler, and along the third direction, the top of the filler protrudes from the top of the battery cell, wherein the first direction, the second direction, and the third direction intersect each other.

[0008] In one or more embodiments of this application, along the second direction, the distance between the side of the battery cell and the side of the filler is c, satisfying: c ≤ 25 mm; and / or,

[0009] Along the third direction, the distance between the bottom of the battery cell and the bottom of the filler is d, which satisfies: d≤1mm.

[0010] In one or more embodiments of this application, the filler includes:

[0011] Vacuum bags with a containing cavity;

[0012] The filler is placed inside the cavity. When the filler is in a compressed state, a vacuum is formed between the vacuum bag and the filler, and the filler is compressed to 20-80% of its initial thickness.

[0013] In one or more embodiments of this application, the vacuum bag has sealing edges formed around three sides of the filler, wherein the width of the sealing edge located on the side of the filler along a second direction is L2, the distance between the inner side of the sealing edge near the filler and the filler in the second direction is L1, and the distance between the filler and the outermost side of the vacuum bag in the second direction is L, satisfying L=L1+L2; and / or,

[0014] L1 satisfies: L1 = 0.5t + 3mm, where t is the initial thickness of the filler; and / or,

[0015] L2 satisfies: L2 = 5~8mm.

[0016] In one or more embodiments of this application, the width of the sealing edge located at the top of the filler is A1, satisfying: A1 ≥ 3 mm; and / or,

[0017] In the third direction, the distance between the inner edge of the sealing edge and the filler is A, which satisfies: A = 6~8mm.

[0018] In one or more embodiments of this application, the filler is provided with a pressure relief structure, which is located between the sealing edge and the filler. When the pressure relief structure is opened, the filler loses its vacuum state.

[0019] In one or more embodiments of this application, the pressure relief structure extends along a second direction, and at least one end of the pressure relief structure along the second direction is provided with an easy-tear opening. Along a third direction, the distance between the easy-tear opening and the filler is 'a', satisfying: a = 1~3 mm; and / or,

[0020] Along the second direction, the distance between the inner side of the tear-off opening and the inner side of the sealing edge near the filler is b, which satisfies: b≥2mm.

[0021] In one or more embodiments of this application, along the first direction, the thickness of the filler is T, satisfying: T = (0.35~0.4)t, where t is the initial thickness of the filler; and / or,

[0022] When the filler is in a compressed state, along the second direction, the top of the battery cell protrudes beyond the top of the filler, and the distance between the top of the battery cell and the top of the filler is e, satisfying: e = 1.5~2mm; or,

[0023] When the filler is in a compressed state, along the second direction, the top of the filler protrudes beyond the top of the battery cell, and the distance between the top of the filler and the top of the battery cell is e, which satisfies: e = 1.5~2mm.

[0024] Secondly, this application provides an electrical device including the battery pack described in any of the first aspects.

[0025] Based on the above technical solution, the battery pack and power device of this application have at least the following beneficial technical effects:

[0026] The battery pack of this application incorporates a filler between adjacent battery cells and / or between a battery cell and the side wall of the housing. This filler has a compressed state under vacuum and an expanded state when the vacuum is removed. Therefore, in the compressed state, the filler is thinner overall, making it easier to place between adjacent battery cells or between a battery cell and the side wall of the housing. When the filler is expanded under vacuum, its two sides in a first direction abut against the sides of the two adjacent battery cells, or against the sides of the battery cells and the side wall of the housing. This precise filling within the gaps between adjacent battery cells or between a battery cell and the side wall of the housing improves the filler's adaptability and enhances the battery pack's assembly efficiency and cycle performance. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a partial structural schematic diagram of the battery pack provided in the embodiments of this application.

[0029] Figure 2 This is a partial exploded disassembly diagram of the battery pack provided in the embodiments of this application.

[0030] Figure 3 This is a side view of the battery cell and filler in the battery pack provided in the embodiments of this application.

[0031] Figure 4This is an enlarged structural diagram of the side portion of the battery cell and filler in the battery pack provided in the embodiments of this application.

[0032] Figure 5 This is a three-dimensional structural diagram of the filler in the battery pack provided in the embodiments of this application.

[0033] Figure 6 This is a partial longitudinal cross-sectional schematic diagram of the filler in the battery pack provided in the embodiments of this application.

[0034] Figure 7 This is a schematic diagram of the main view of the filler structure in the battery pack provided in the embodiment of this application.

[0035] Figure 8 This is a partial enlarged view of the filler structure in the battery pack provided in the embodiments of this application.

[0036] In the diagram: 1-box side wall; 2-cell battery; 3-filler; 21-electrode terminal; 31-sealing edge; 32-vacuum bag; 33-filler; 34-pressure relief structure; 341-tear-opening; X-first direction; Y-second direction; Z-third direction. Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0039] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0041] With the booming development of the new energy vehicle market, consumers' demand for energy-saving and environmentally friendly new energy travel modes is increasing. As a core component of new energy vehicles, the technological advancement and cost control of power batteries have become the focus of the industry. Among power batteries, blade batteries are gradually becoming mainstream products. In related technologies, blade battery modules are generally installed into the battery pack box by hoisting. When the robotic arm picks up the module and puts it into the box, the gap between the module and the side wall of the box varies due to the positional tolerance of the robotic arm and the tolerance between the module and the box. This results in different specifications of filler material required, necessitating the use of multiple different specifications of filler material. This not only increases production costs but also reduces battery production efficiency and assembly quality.

[0042] Based on the above considerations, in order to solve the technical problem of low adaptability of fillers used in battery packs in the prior art, this application provides a battery pack and an electrical device.

[0043] The electrical device described in this application is an electrical device that uses a battery pack or battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0044] This application describes an electrical device using a vehicle as an example. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle, and the battery can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller controls the battery to supply power to the motor, for example, to meet the power needs of starting, navigation, and driving the vehicle. The battery can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0045] The battery pack described in this application can also be referred to as a battery. Specifically, the battery pack includes a battery management system (BMS) and multiple battery cells. These battery cells can be electrically connected in series, parallel, or a combination of both, and communicate with the battery management system, which controls and monitors the operating status of each battery cell. Alternatively, multiple battery cells can first be combined with a module management system to form a battery module or battery assembly. These battery modules or assemblies can then be electrically connected in series, parallel, or a combination of both, and together with the battery management system, form a battery pack. The battery cells can be secondary or primary batteries; they can also be lithium-sulfur, sodium-ion, or magnesium-ion batteries, but are not limited to these. Battery cells can be flat, cuboid, etc.

[0046] It should be noted that the first direction X, the second direction Y, and the third direction Z described in this application intersect each other. In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Specifically, the first direction X described in this application can be the width direction of the battery pack, the second direction Y can be the length direction of the battery pack, and the third direction Z can be the height direction of the battery pack.

[0047] Please refer to Figure 1 and Figure 2 The battery pack provided in this application includes a housing, a battery module, and a filler 3. The housing includes housing sidewalls 1 arranged opposite each other along a first direction X. The battery module is disposed inside the housing and includes a plurality of battery cells 2 stacked sequentially along the first direction X. The filler 3 is disposed between two adjacent battery cells 2 along the first direction X, and / or between the battery cell 2 and the housing sidewall 1. The filler 3 has a compressed state under vacuum and an expanded state under vacuum. When the filler 3 is in the expanded state, the two sides of the filler 3 in the first direction X respectively abut against the sides of two adjacent battery cells 2, and / or abut against the sides of the battery cells 2 and the housing sidewall 1 respectively.

[0048] It should be noted that the filler 3 can be a structural component with a certain degree of elasticity, used to fill the gap between two adjacent battery cells 2, or to fill the gap between the battery cell 2 and the adjacent side wall 1 of the casing, thereby preventing the battery cell 2 from shifting within the casing and improving the stability of the battery pack. Simultaneously, the filler 3 has a certain degree of elasticity, which can absorb the expansion of the battery cell 2 during charging and discharging, preventing the battery cell 2 from directly contacting the casing and causing deformation.

[0049] By providing a filler 3 between two adjacent battery cells 2 and / or between battery cell 2 and the side wall 1 of the housing, the filler 3 has a compressed state under vacuum and an expanded state under vacuum. Therefore, in the compressed state, the filler 3 is thinner overall, making it easier to place between two adjacent battery cells 3 or between battery cell 2 and the side wall 1 of the housing. When the filler 3 is in the expanded state under vacuum, the two sides of the filler 3 in the first direction X respectively abut against the sides of two adjacent battery cells 2, and / or abut against the sides of battery cell 2 and the side wall 1 of the housing, filling the gaps between adjacent battery cells 2 and / or between battery cell 2 and the side wall 1 of the housing. This allows for precise filling, improves the adaptability of the filler 3, and also improves the assembly efficiency and cycle performance of the battery pack.

[0050] In some embodiments, please refer to Figure 4 and Figure 5 The filler 3 includes a vacuum bag 32 and a filler 33. The vacuum bag 32 has a receiving cavity. The filler 33 is filled in the receiving cavity. When the filler 3 is in a compressed state, a vacuum state is formed between the vacuum bag 32 and the filler 33, and the filler 33 is compressed to 20-80% of its initial thickness.

[0051] It should be noted that the filler 33 can be made of foam material, making it easy to deform and allowing for rapid compression via vacuuming. The vacuum bag 32 is used to contain the filler 33 and provides insulation. The vacuum bag 32 can be made of polyimide or polyamide. In some embodiments, the filler 33 can be a cuboid with a certain thickness. In some embodiments, the filler 33 can be foam or felt. In some embodiments, the longitudinal section of the vacuum bag 32 can be U-shaped, in which case the three sides of the vacuum bag 32 are open, the filler 33 is placed inside the vacuum bag 32 through the openings, and after vacuuming, the openings are sealed by heat fusion to form an edge 31, so that the vacuum bag 32 has an edge 31 around the three sides of the filler 33.

[0052] In the technical solution of this application embodiment, a vacuum bag 32 is used to contain a filler 33 to form a filler 3, so that the filler 33 can be compressed into a compressed state by drawing a vacuum between the vacuum bag 32 and the filler 33. When the vacuum bag 32 is broken, the vacuum state between the vacuum bag 32 and the filler 33 is lost, so that the filler 33 is in an expanded state, thereby accurately filling the gap.

[0053] In some embodiments, such as Figure 7As shown, the filler 3 is provided with a pressure relief structure 34, which is located between the sealing edge 31 and the filler 33. When the pressure relief structure 34 is opened, the filler 3 loses its vacuum state. The pressure relief structure 34 can be the unsealed area between the filler 33 and the sealing edge 31. In some embodiments, the pressure relief structure 34 is not on the same side as the electrode terminal 21 of the battery cell 2, for example, as... Figure 3 As shown, the pressure relief structure 34 is located in the third direction Z, and the electrode terminal 21 is located in the second direction Y, thereby avoiding the electrode terminal 21 from obstructing the opening of the pressure relief structure 34.

[0054] By opening the pressure relief structure 34, the vacuum state between the vacuum bag 32 and the filler 33 can be lost, allowing air to enter between the vacuum bag 32 and the filler 33, causing the filler 33 to gradually expand and return to its original state, that is, the filler 3 is in an expanded state.

[0055] In some embodiments, such as Figure 7 As shown, the pressure relief structure 34 extends along the second direction Y. At least one end of the pressure relief structure 34 along the second direction Y is provided with an easy-tear opening 341, which allows the pressure relief structure 34 to be easily torn open. In some embodiments, the easy-tear opening 341 may be a triangular or arc-shaped structure formed by recessing it into the side of the vacuum bag 32.

[0056] In some embodiments, along the third direction Z, the distance between the easy-tear opening 341 and the filler 33 is 'a', satisfying: a = 1 to 3 mm. For example, a = 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm, etc. This facilitates the opening of the pressure relief structure 34 through the easy-tear opening 341, allowing air to quickly enter the filler 33, causing the filler 33 to expand rapidly and fill the gap.

[0057] In some embodiments, along the second direction Y, the distance between the inner side of the tear opening 341 and the inner side of the sealing edge 31 near the filler 33 is b, satisfying: b ≥ 2 mm. For example, b = 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm, etc., so that there is a distance between the tear opening 341 and the inner side of the sealing edge 31 near the filler 33, so that the tear opening has a good seal and prevents the seal from being easily damaged at the tear opening 341.

[0058] In some embodiments, the gap between two adjacent battery cells 2 or the distance between a battery cell 2 and the side wall 1 of the casing is 0.2-5 mm. Along the first direction X, such as... Figure 6As shown, the thickness of the filler 3 is T, which satisfies: T = (0.35~0.4)t, where t is the initial thickness of the filler 33. For example, when the thickness of the filler 33 is 1-3mm, the thickness T of the filler 3 can be 0.4t, and when the thickness of the filler 33 is 4-10mm, the thickness T of the filler 3 can be 0.35t.

[0059] In some embodiments, when the filler 3 is in a compressed state, the side of the battery cell 2 protrudes beyond the side of the filler 3 along the second direction Y, meaning the side of the filler 3 does not extend beyond the side of the battery cell 2. The distance c between the side of the battery cell 2 and the side of the filler 3 along the second direction Y satisfies: c ≤ 25 mm; for example, c = 25 mm, 20 mm, 15 mm, 10 mm, 5 mm, or 2 mm, etc. It is understood that the distances between the two sides of the filler 3 along the second direction Y and the sides of the battery cell 2 can be the same or different. The side of the filler 3 does not extend beyond the side of the battery cell 2 so that the filler 3 does not obstruct the installation of other components within the battery pack.

[0060] In some embodiments, since adhesive is applied to the bottom of the battery cell 2 to secure it to the casing, to prevent adhesive from entering between the filler 3 and the battery cell 2, the bottom of the battery cell 2 protrudes beyond the bottom of the filler 3 along the third direction Z; that is, the bottom of the filler 3 does not extend beyond the bottom of the battery cell 2. The distance d between the bottom of the battery cell 2 and the bottom of the filler 3 along the third direction Z satisfies: d ≤ 1 mm. For example, d = 1 mm, 0.9 mm, 0.8 mm, 0.7 mm, 0.6 mm, 0.5 mm, 0.4 mm, 0.3 mm, 0.2 mm, or 0.1 mm, etc.

[0061] In some embodiments, since the pressure relief structure 34 and the easy-tear opening 341 are located on the top of the filler 3, in order to facilitate the operation of the easy-tear opening 341, the top of the filler 3 protrudes from the top of the battery cell 2 along the third direction Z.

[0062] In some embodiments, when the filler 3 is in a compressed state, along the second direction Y, the top of the battery cell 2 protrudes beyond the top of the filler 33, and the distance between the filler 33 and the top of the battery cell 2 is e, satisfying: e = 1.5~2mm; for example, e = 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm. In other embodiments, when the filler 3 is in a compressed state, along the second direction Y, the top of the filler 33 protrudes beyond the top of the battery cell 2, and the distance between the filler 33 and the top of the battery cell 2 is e, satisfying: e = 1.5~2mm; for example, e = 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm.

[0063] In some embodiments, please refer to Figure 3 The width of the sealing edge 31 located on the side of the filler 3 along the second direction Y is L2, which satisfies: L2 = 5~8mm. For example, L2 = 5mm, 6mm, 7mm or 8mm, etc. This ensures that the sealing edge 31 has sufficient width to achieve a vacuum seal between the vacuum bag 32 and the filler 33. In the second direction Y, the distance between the inner side of the sealing edge 31 near the filler 33 and the filler 33 is L1, which satisfies: L1 = 0.5t + 3mm, where t is the initial thickness of the filler 33. Since the filler 33 has a certain thickness before being vacuum compressed, i.e., the initial thickness, the above setting ensures that the distance L1 between the inner side of the sealing edge 31 near the filler 33 and the filler 33 satisfies the above relationship with the initial thickness t of the filler 33. This facilitates the placement of the filler 33 into the vacuum bag, and after vacuuming between the vacuum bag 32 and the filler 33, the filler 33 can be compressed to the required thickness and effectively sealed through the sealing edge 31. In the second direction Y, the distance between the filler 33 and the outermost part of the vacuum bag 32 is L, which satisfies L=L1+L2.

[0064] Please refer to Figure 6 The width of the sealing edge 31 located at the top of the filler 3 is A1, satisfying: A1 ≥ 3mm; for example, A1 = 3mm, 4mm, 5mm, 6mm, or 7mm, etc. This ensures that the sealing edge 31 has sufficient width to achieve a vacuum seal between the vacuum bag 32 and the filler 33. In some embodiments, the number of sealing edges 31 located at the top of the filler 3 can be one or more, for example, one or two, to ensure sufficient sealing. The distance between the inner edge of the sealing edge 31 near the filler 33 and the filler 33 is A, satisfying A = 6~8mm, for example, A = 6mm, 6.5mm, 7mm, 7.5mm, or 8mm, etc. This allows the filler 33 to be compressed to the required thickness after a vacuum is drawn between the vacuum bag 32 and the filler 33.

[0065] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: The enclosure includes enclosure sidewalls disposed opposite each other along a first direction; A battery module is disposed inside the housing, and the battery module includes a plurality of battery cells stacked sequentially along a first direction; A filler is disposed between two adjacent battery cells along the first direction, and / or between the battery cell and the side wall of the housing, wherein the filler has a compressed state under vacuum and an expanded state under de-vacuum conditions. When the filler is in the expanded state, the filler abuts against the sides of two adjacent battery cells on both sides in the first direction, and / or abuts against the sides of the battery cell and the side wall of the housing, respectively.

2. The battery pack according to claim 1, characterized in that, When the filler is in a compressed state, along the second direction, the side of the battery cell protrudes from the side of the filler; along the third direction, the bottom of the battery cell protrudes from the bottom of the filler; and along the third direction, the top of the filler protrudes from the top of the battery cell, wherein the first direction, the second direction, and the third direction intersect each other.

3. The battery pack according to claim 2, characterized in that, Along the second direction, the distance c between the side of the battery cell and the side of the filler satisfies: c ≤ 25 mm; and / or, Along the third direction, the distance between the bottom of the battery cell and the bottom of the filler is d, which satisfies: d≤1mm.

4. The battery pack according to claim 3, characterized in that, The filler includes: Vacuum bags with a containing cavity; The filler is filled into the receiving cavity. When the filler is in a compressed state, a vacuum is formed between the vacuum bag and the filler, and the filler is compressed to 20-80% of its initial thickness.

5. The battery pack according to claim 4, characterized in that, The vacuum bag has sealing edges formed around three sides of the filler, wherein the width of the sealing edge located on the side of the filler along the second direction is L2, the distance between the inner side of the sealing edge and the filler in the second direction is L1, and the distance between the filler and the outermost side of the vacuum bag in the second direction is L, satisfying L = L1 + L2; and / or, The L1 satisfies: L1 = 0.5t + 3mm, where t is the initial thickness of the filler; and / or, The L2 satisfies: L2 = 5~8mm.

6. The battery pack according to claim 5, characterized in that, The width of the sealing edge located at the top of the filler is A1, satisfying: A1 ≥ 3 mm; and / or, In the third direction, the distance between the inner side of the sealing edge near the filler and the filler is A, which satisfies: A = 6~8mm.

7. The battery pack according to claim 4, characterized in that, The filler is provided with a pressure relief structure, which is located between the sealing edge and the filler. When the pressure relief structure is opened, the filler loses its vacuum state.

8. The battery pack according to claim 7, characterized in that, The pressure relief structure extends along a second direction, and at least one end of the pressure relief structure along the second direction is provided with an easy-tear opening. Along the third direction, the distance between the easy-tear opening and the filler is 'a', satisfying: a = 1–3 mm; and / or, Along the second direction, the distance between the inner side of the tear opening and the inner side of the sealing edge near the filler is b, which satisfies: b≥2mm.

9. The battery pack according to claim 4, characterized in that, Along the first direction, the thickness of the filler is T, satisfying: T = (0.35~0.4)t, where t is the initial thickness of the filler; and / or, When the filler is in a compressed state, along the second direction, the top of the battery cell protrudes beyond the top of the filler, and the distance between the top of the battery cell and the top of the filler is e, satisfying: e = 1.5~2mm; or, When the filler is in a compressed state, along the second direction, the top of the filler protrudes beyond the top of the battery cell, and the distance between the top of the filler and the top of the battery cell is e, satisfying: e = 1.5~2mm.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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