Battery pack and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery pack and electric equipment. The disclosed battery pack comprises a box body and a battery cell module, the battery cell module is arranged in the box body; an edge beam is arranged on the outer side of the side wall of the box body, and a battery replacing seat is arranged on the edge beam; an anti-collision piece is also arranged in the box body, and the anti-collision piece is positioned between the battery cell module and the side wall of the box body; one side of the anti-collision piece is connected with the inner side of the side wall of the box body, and the other side of the anti-collision piece is propped against the battery cell module. The battery pack disclosed by the utility model can be quickly mounted or dismounted, so that the battery replacement time is shortened; meanwhile, the anti-collision piece in the battery pack can absorb energy generated by collision when side collision occurs, so that the battery cell structure and the internal structure of the battery pack are prevented from being damaged.

Description

Battery packs and electrical equipment Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0002] Battery packs include swappable and non-swapping battery packs. In actual use, swappable battery packs need to be removed from or moved between the vehicle and the swapping station multiple times. Therefore, compared to non-swapping battery packs, swappable battery packs have a higher risk of collision and are more complex to disassemble and install, making quick installation impossible. Summary of the Invention

[0003] In view of the aforementioned technical problems, the purpose of this application is to at least partially solve one of the technical problems in the related art. To this end, this application provides a battery pack and electrical equipment that can be quickly installed or removed, reducing battery swapping time; simultaneously, the anti-collision components in the battery pack can absorb the energy generated by a side collision, preventing damage to the cell structure and the internal structure of the battery pack.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows:

[0005] According to a first aspect of this application, this application provides a battery pack, comprising:

[0006] Box;

[0007] The battery cell module is housed within the enclosure.

[0008] A side beam is provided on the outer side wall of the enclosure, and a battery swapping base is provided on the side beam; a collision protection device is also provided inside the enclosure, and the collision protection device is located between the battery cell module and the side wall of the enclosure; and in the width or length direction of the enclosure, one side of the collision protection device is connected to the inner side of the side wall of the enclosure, and the other side of the collision protection device abuts against the battery cell module.

[0009] In one alternative implementation, the anti-collision component includes a plate and a thin plate;

[0010] The sidewalls of the battery cell module and the housing are respectively attached to the plate; the thin plate is disposed between the two plates, and the plate and the thin plate form at least one cavity.

[0011] In one alternative implementation, the width of the anti-collision member is 10mm to 30mm in the width direction of the side beam.

[0012] In one alternative embodiment, the thickness of the plate is 1mm to 4mm in the width direction of the side beam.

[0013] In one alternative implementation, the battery swapping station includes a first housing and a movable pin;

[0014] The first housing is provided with a mounting base, and the top of the mounting base is provided with a ball bearing;

[0015] The movable pin passes through the side beam, extends into the first housing, and is connected to the end of the mounting base away from the ball.

[0016] In the thickness direction of the side beam, the movable pin is used to control the height of the mounting base.

[0017] In one alternative implementation, the battery swapping station further includes a second housing and an adjustment element;

[0018] In the thickness direction of the side beam, the second housing is disposed on the side of the side beam away from the first housing;

[0019] The adjusting component is located at the bottom end of the second housing; the end of the movable pin away from the mounting base is movably connected to the adjusting component, and the adjusting component controls the movable pin to move up and down.

[0020] In one optional implementation, the battery swapping station further includes a second elastic element;

[0021] The second elastic element is sleeved on the movable pin, and one end of the second elastic element is connected to the bottom end inside the second housing.

[0022] In one optional implementation, the battery swapping station further includes a first elastic element;

[0023] One end of the first elastic element abuts against the inner wall of the first housing, and the other end of the first elastic element abuts against the ball.

[0024] In one optional implementation, a through hole is provided on the side end of the first housing;

[0025] The size of the through hole is smaller than the size of the ball; the ball is movably disposed in the first housing.

[0026] In one alternative implementation, one end of the movable pin is threadedly connected to the adjusting member;

[0027] The movable pin and the adjusting member are respectively provided with mutually compatible threads.

[0028] According to a second aspect of this application, this application also provides an electrical device, including: a battery pack according to any embodiment of the first aspect of this application.

[0029] The battery pack and electrical equipment provided in this application have at least the following beneficial effects:

[0030] 1. The battery pack provided in this application includes a cell module housed inside a housing; a side beam is provided on the outside of the side wall of the housing, and a battery swapping seat is provided on the side beam; an anti-collision member is also provided inside the housing, and the anti-collision member is located between the cell module and the side wall of the housing; in the width or length direction of the housing, one side of the anti-collision member is connected to the inside of the side wall of the housing, and the other side of the anti-collision member abuts against the cell module; the anti-collision member can support the cell module, and when a side collision occurs, it can absorb the energy generated by the collision, preventing damage to the cell structure and the internal structure of the battery pack.

[0031] 2. In a preferred embodiment of the battery pack of this application, a mounting base is provided inside the first housing of the battery swapping station, and a ball bearing is movably provided on the top of the mounting base; this enables quick installation or removal of the battery pack, reduces battery swapping time, and improves efficiency. Attached Figure Description

[0032] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0033] Figure 1 shows a schematic diagram of the battery pack provided in this application.

[0034] Figure 2 shows a schematic diagram of the structure of the battery pack provided in this application.

[0035] Figure 3 shows a schematic diagram of the side beam and battery swapping base structure of the battery pack provided in this application;

[0036] Figure 4 shows a schematic diagram of the battery swapping stand structure of the battery pack provided in this application;

[0037] Figure 5 shows a schematic diagram of the anti-collision structure of the battery pack provided in this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 100 — Box body;

[0040] 110 – Anti-collision component; 111 – Plate; 112 – Thin plate; 113 – Cavity;

[0041] 120 – Battery swapping base; 121 – First elastic element; 122 – Ball bearing; 123 – First housing; 124 – Mounting base; 125 – Moving pin; 126 – Second housing; 127 – Second elastic element; 128 – Adjusting element;

[0042] 130 – Side beam; 200 – Battery cell module.

[0043] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0044] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0045] All reagents, instruments, or materials used in this application are commercially available.

[0046] In actual use, battery swapping packs need to be removed from or moved between vehicles and swapping stations multiple times. Typically, battery swapping packs use a bolted structure for removal and installation. However, this bolted structure makes the battery swapping packs susceptible to impacts during removal and installation, posing a high risk of collision. Furthermore, the removal and installation of the bolted structure is complex and cannot be done quickly.

[0047] In view of the above-mentioned technical problems, this application provides a battery pack and an electrical device that can be quickly installed or removed, reducing battery swapping time; at the same time, the anti-collision components in the battery pack can absorb the energy generated by the side collision, preventing damage to the cell structure and the internal structure of the battery pack.

[0048] The specific technical solution of this application is as follows:

[0049] In some embodiments of this application, a battery pack is provided, including: a housing 100 and a cell module 200; the cell module 200 is disposed inside the housing 100; a side beam 130 is provided on the outer side wall of the housing 100, and a battery swapping seat 120 is provided on the side beam 130; a shock absorber 110 is also provided inside the housing 100, and the shock absorber 110 is located between the cell module 200 and the side wall of the housing 100; and in the width or length direction of the housing 100, one side of the shock absorber 110 is connected to the inner side of the side wall of the housing 100, and the other side of the shock absorber 110 abuts against the cell module 200.

[0050] Referring to Figure 1, the housing 100 is made of metal, such as copper alloy, aluminum alloy, or stainless steel. The housing 100 has a space for installing the battery cell modules 200. The battery cell modules 200 can consist of multiple modules directly connected by aluminum busbars. Each module can be composed of individual battery cells connected in series or directly. Direct connection between modules reduces the number of series copper busbars between modules, reduces the number of output terminals, effectively lowers costs, and improves the battery pack's assembly efficiency and energy density. The battery cell module 200 can be composed of components such as battery cells, foam, and end plates. For example, the foam on both sides of the battery cell absorbs the expansion of the cell during charging and discharging. End plates can be installed at both ends of the battery cell module 200 to provide pre-tightening force and protection.

[0051] Referring to Figure 2, a side beam 130 is provided on the outer side of the housing 100. The side beam 130 can be configured in a shape similar to a "T" rotated 90 degrees. In a preferred embodiment, the side beam 130 can be perpendicular to the side wall of the housing 100. A battery swapping seat 120 is provided on the side beam 130 to ensure accurate docking and installation of the high and low voltage plug-in and the battery swapping liquid cooling plug-in in the battery pack, thereby ensuring the correct installation of the battery pack.

[0052] Referring to Figures 2 and 3, the anti-collision component 110 can be positioned between the end plate of the cell module 200 and the side wall of the housing 100. It can be made of metal, such as aluminum plate; alternatively, it can be made of composite materials. The anti-collision component 110 can also contain regular or irregular cavities. In the event of a side collision, it can absorb the energy generated by the impact, preventing damage to the cell structure and the internal structure of the battery pack. Furthermore, the cavities can be filled with shock-absorbing materials to enhance the shock absorption effect during collisions. This contrasts with traditional anti-collision structures made of polymer materials, such as rubber, which lack a supporting function. The anti-collision component 110 of this application can support the expansion force and deformation of the cells in the battery pack at the end of their cycle life. It can also withstand the collapse deformation caused by side impacts or compression in the thickness direction of the side beam 130, absorbing the deformation and energy transferred from the side beam 130, ensuring the structural integrity of the cells and improving the safety performance of the battery pack. The anti-collision component 110 can be connected and fixed to the inner side wall of the housing 100 by detachable connection methods such as riveting and bolting or fixed connection methods such as welding and bonding, so as to prevent movement when the cell module 200 is installed into the housing 100. After the cell module 200 is installed into the housing 100, the expansion force of the cell compresses the anti-collision component 110 and the inner side wall of the housing 100, ensuring that the mechanical performance of the entire battery pack meets the requirements.

[0053] A battery pack provided by the present application includes a battery cell module disposed within a box body; a side beam is provided outside the side wall of the box body, and a battery swapping seat is provided on the side beam; an anti-collision member is further provided within the box body, and the anti-collision member is located between the battery cell module and the side wall of the box body; and in the width or length direction of the box body, one side of the anti-collision member is connected to the inner side of the side wall of the box body, and the other side of the anti-collision member abuts against the battery cell module. In the battery pack of the present application, in the width or length direction of the box body, one side of the anti-collision member is connected to the inner side wall of the box body, and the other side of the anti-collision member abuts against the battery cell module. While the anti-collision member can support the battery cell module, when a side collision occurs, it can absorb the energy generated by the collision, preventing damage to the battery cell structure and the internal structure of the battery pack. At the same time, it can be quickly installed or disassembled, reducing the battery swapping time.

[0054] In some embodiments, the anti-collision member 110 includes a plate body 111 and a thin plate 112; the battery cell module 200 and the side wall of the box body 100 are respectively in contact with the plate body 111; the thin plate 112 is disposed between the two plate bodies 111, and at least one cavity 113 is formed between the plate body 111 and the thin plate 112.

[0055] Referring to FIG. 5, the anti-collision member 110 may be composed of multiple plate bodies 111 and multiple thin plates 112. The plate bodies 111 are respectively in contact with the battery cell module 200 and the side wall of the box body 100. Of course, the plate body 111 combined with the side wall of the box body 100 can be fixed to the side wall of the box body 100 by a fixed connection or a detachable connection. The thin plate 112 is disposed between the two plate bodies 111. If the plate body 111 is made of a metal material, the thin plate 112 can be made of the same metal material as the plate body 111 or a softer metal material, so that the anti-collision member 110 can achieve a better anti-collision effect. At least one cavity 113 is formed between the plate body 111 and the thin plate 112, that is, a "mouth" shape, a "day" shape, etc. can be formed between the plate body 111 and the thin plate 112, which can ensure that when the battery pack undergoes side collisions during battery swapping and transfer, the energy generated by the collision can be absorbed, preventing damage to the battery cell structure and other internal structural components of the battery pack.

[0056] In some embodiments, in the width direction of the side beam 130, the width of the anti-collision member 110 is 10 mm to 30 mm.

[0057] Referring to Figure 5, to maximize the anti-collision effect of the anti-collision component 110 while ensuring high energy density of the battery cells in the battery pack, the width of the anti-collision component 110 in the width direction of the side beam 130 can be any value or any point between 10mm, 15mm, 20mm, 25mm, or 30mm. By limiting the thickness of the anti-collision component 110, both good anti-collision performance and good energy density of the battery pack can be ensured. If the thickness of the anti-collision component 110 is too large, it will occupy the space of the housing 100 and affect the energy density of the battery pack; if it is too small, it will affect the anti-collision performance of the battery pack.

[0058] In some embodiments, the thickness of the plate 111 in the width direction of the side beam 130 is 1 mm to 4 mm, preferably 1.5 mm to 3 mm.

[0059] Referring to Figure 5, the thickness of the plate 111 in the width direction of the side beam 130 can be any one of 1mm, 1.5mm, 2mm, 2.5mm, 3mm, or 4mm, or any value between any two. By limiting the thickness of the plate 111, the vibration damping effect during collisions can be improved, and it can support the expansion force and deformation of the battery cell at the end of its cycle life, or the collapse deformation under side impact or vertical compression. It can absorb the lateral deformation and energy transmitted by the side beam 130, ensuring the structural integrity of the battery cell and improving the safety performance of the battery pack.

[0060] In some embodiments, the battery swapping base 120 further includes a first housing 123 and a movable pin 125. A mounting base 124 is disposed inside the first housing 123, and a ball bearing 122 is disposed at the top end of the mounting base 124. The movable pin 125 passes through the side beam 130 and extends into the first housing 123, and the movable pin 125 is connected to the end of the mounting base 124 away from the ball bearing 122. In the thickness direction of the side beam 130, the movable pin 125 is used to control the height of the mounting base 124.

[0061] Referring to Figure 4, the first housing 123 of the battery swapping base 120 is located at the upper end of the battery swapping base 120. A mounting base 124 and a ball bearing 122 are disposed within the first housing 123. The ball bearing 122 is movably mounted on the mounting base 124 and can move in the thickness direction of the side beam 130. One end of a movable pin 125 extends through the side beam 130 into the first housing 123 and connects to the mounting base 124. That is, in the thickness direction of the side beam 130, one end of the mounting base 124 abuts against the ball bearing 122, and the other end of the mounting base 124 is connected to the movable pin 125. The movable pin 125 can move freely up and down, thereby adjusting the height of the mounting base 124, which in turn adjusts the height of the ball bearing 122.

[0062] In some embodiments, the battery swapping base 120 further includes a second housing 126 and an adjusting member 128; in the thickness direction of the side beam 130, the second housing 126 is disposed on the side of the side beam 130 away from the first housing 123; the adjusting member 128 is disposed at the bottom end of the second housing 126; the end of the movable pin 125 away from the mounting base 124 is movably connected to the adjusting member 128, and the adjusting member 128 controls the movable pin 125 to move up and down.

[0063] Referring to Figure 4, in the thickness direction of the side beam 130, the second housing 126 is disposed at the lower end of the side beam 130, and the second housing 126 is connected to the first housing 123. The adjusting member 128 passes through the second housing 126 from the bottom end of the second housing 126 and enters the first housing 123, and is connected to the mounting base 124. The adjusting member 128 is also movably disposed at the bottom end of the second housing 126. One end of the adjusting member 128 and the moving pin 125 can be connected by a thread. The adjusting member 128 and the moving pin 125 are respectively provided with matching threads. Rotating the adjusting member 128 can make the moving pin 125 move up and down.

[0064] In some embodiments, the battery swapping base 120 further includes a second elastic member 127; the second elastic member 127 is sleeved on the movable pin 125, and one end of the second elastic member 127 is connected to the bottom end inside the second housing 126.

[0065] Referring to Figure 4, the second elastic element 127 is sleeved on the movable pin 125. One end of the second elastic element 127 is connected to the movable pin 125, and the other end of the second elastic element 127 is connected to the bottom end of the second housing 126. The second elastic element 127 allows the movable pin 125 to move up and down more flexibly. The second elastic element 127 can also be embedded in the second housing 126 by adjusting the adjusting element 128, which is threadedly connected to the movable pin 125.

[0066] In some embodiments, the battery swapping base 120 further includes a first elastic member 121; one end of the first elastic member 121 abuts against the inner wall of the first housing 123, and the other end of the first elastic member 121 abuts against the ball 122.

[0067] Referring to Figure 4, one end of the first elastic member 121 abuts against the inner wall of the first housing 123, and the other end of the first elastic member 121 abuts against the ball 122. The first elastic member 121 can ensure that the ball 122 retracts or springs out in the battery swapping base 120.

[0068] In some embodiments, a through hole is provided on the side end of the first housing 123; the size of the through hole is smaller than the size of the ball 122; the ball 122 is movably disposed in the first housing 123.

[0069] Referring to Figure 4, the number of through holes on the side of the first housing 123 can be matched with the number of balls 122. The size of the through holes is smaller than the size of the balls 122, which can ensure that the balls 122 will not fall out of the second housing 126. For example, four balls 122 are set on the mounting base 124 inside the first housing 123. When the battery pack is installed, the balls 122 are squeezed inward by the wall of the vehicle mounting hole, ensuring the smooth installation of the battery pack.

[0070] In some embodiments of this application, the provided battery pack includes a housing 100 and a cell module 200. The cell module 200 is disposed within the housing 100, a side beam 130 is disposed on the outer side wall of the housing 100, a battery swapping seat 120 is disposed on the side beam 130, and an anti-collision component 110 is disposed within the housing 100. The battery swapping seat 120 includes a first elastic element 121, a ball bearing 122, a first housing 123, a mounting base 124, a movable pin 125, a second housing 126, a second elastic element 127, and an adjusting element 128. The ball bearing 122 is mounted on the mounting base 124 inside the first housing 123. During battery pack installation, the ball bearing 122 is squeezed inward by the wall of the vehicle's mounting hole, ensuring smooth installation of the battery pack. The bottom of the mounting base 124 is connected to the movable pin 125, and a second elastic element 127 is also connected to the movable pin 125. The first housing 123 and the second housing 126 are respectively connected to the side beam 130 of the housing 100. The adjusting element 128 is disposed on the second housing 126 and is threadedly connected to the movable pin 125. This battery pack can be quickly installed or removed, and effectively prevents damage to the cell structure and the internal structure of the battery pack in the event of a side collision.

[0071] In some embodiments of this application, an electrical device is also provided, including the battery pack in any of the above embodiments. The electrical device includes, but is not limited to, vehicles such as electric cars, electric motorcycles, or electric bicycles, or electric storage cabinets.

[0072] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges or individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0073] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0074] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0075] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0076] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0077] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0078] It should be noted that the terms "and / or" or " / " used herein are merely descriptions of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The singular forms "a," "the," and "the" used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0079] In the detailed description and claims, a list of items connected by the terms "at least one of," "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may contain a single element or multiple elements. Item B may contain a single element or multiple elements. Item C may contain a single element or multiple elements.

[0080] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0081] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, include: A housing (100) and a battery cell module (200) are disposed inside the housing (100). A side beam (130) is provided on the outer side wall of the housing (100), and a battery swapping seat (120) is provided on the side beam (130). A collision protection member (110) is also provided inside the housing (100), and the collision protection member (110) is located between the battery cell module (200) and the side wall of the housing (100). In the width or length direction of the housing (100), one side of the collision protection member (110) is connected to the inner side of the side wall of the housing (100), and the other side of the collision protection member (110) abuts against the battery cell module (200).

2. The battery pack according to claim 1, characterized in that, The anti-collision component (110) includes a plate (111) and a thin plate (112); the side walls of the battery module (200) and the housing (100) are respectively attached to the plate (111); the thin plate (112) is disposed between the two plates (111), and the plate (111) and the thin plate (112) form at least one cavity (113).

3. The battery pack according to claim 1 or 2, characterized in that, In the width direction of the side beam (130), the width of the anti-collision member (110) is 10mm to 30mm.

4. The battery pack according to claim 2, characterized in that, In the width direction of the side beam (130), the thickness of the plate (111) is 1mm to 4mm.

5. The battery pack according to claim 1, characterized in that, The battery swapping base (120) includes a first housing (123) and a movable pin (125); a mounting base (124) is provided inside the first housing (123), and a ball bearing (122) is provided at the top of the mounting base (124); the movable pin (125) passes through the side beam (130) and extends into the first housing (123), and the movable pin (125) and the mounting base (124) are connected at the end away from the ball bearing (122); in the thickness direction of the side beam (130), the movable pin (125) is used to control the height of the mounting base (124).

6. The battery pack according to claim 5, characterized in that, The battery swapping base (120) also includes a second housing (126) and an adjusting member (128); in the thickness direction of the side beam (130), the second housing (126) is disposed on the side of the side beam (130) away from the first housing (123); the adjusting member (128) is disposed at the bottom end of the second housing (126); the movable pin (125) is movably connected to the adjusting member (128) at one end away from the mounting base (124), and the adjusting member (128) controls the movable pin (125) to move up and down.

7. The battery pack according to claim 6, characterized in that, The battery swapping base (120) also includes a second elastic element (127); the second elastic element (127) is sleeved on the movable pin (125), and one end of the second elastic element (127) is connected to the bottom end inside the second housing (126).

8. The battery pack according to claim 5, characterized in that, The battery swapping base (120) also includes a first elastic element (121); one end of the first elastic element (121) abuts against the inner wall of the first housing (123), and the other end of the first elastic element (121) abuts against the ball (122).

9. The battery pack according to claim 5, characterized in that, The first housing (123) has a through hole on its side; the size of the through hole is smaller than the size of the ball (122); the ball (122) is movably disposed in the first housing (123).

10. An electrical appliance, characterized in that, include: The battery pack according to any one of claims 1 to 9.

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