Battery pack and electric device

Abstract

The application relates to the technical field of batteries, and provides a battery pack and a power utilization equipment. The battery pack comprises a box body, a cooling plate, a cell stack and a control assembly. The cell stack is arranged in the box body, and the box body can protect the cell stack. The cell stack is arranged on the cooling plate, so that the cooling plate can directly dissipate heat for the cell stack. The control assembly is arranged in a direction perpendicular to the depth of a cavity of the box body, so that the thickness of the battery pack is not excessively large, and the battery pack is compact. A flexible circuit board is electrically connected with the cell stack and the control assembly, so that a wire harness for electrically connecting the battery pack and the control assembly is not additionally arranged. Accordingly, a space for arranging the wire harness is not additionally arranged in the box body, the volume of the battery pack arranged in the box body is larger, and finally, the battery pack is more compact, the space utilization is higher, and the capacity is larger.

Description

Technical Field

[0001] This application relates to a battery pack and electrical equipment, belonging to the field of battery technology. Background Technology

[0002] A moduleless battery pack is a type of battery pack in which batteries are directly bonded to the casing using structural adhesive. By abandoning the traditional modular frame structure, it can improve the space utilization within the casing, allowing for a greater number of batteries to be installed inside, thus resulting in a more abundant power supply for the moduleless battery pack.

[0003] Currently, while module-less battery packs can improve space utilization, the connection between components such as the power distribution box inside the battery pack and the cell stack requires wiring harnesses. This necessitates reserving space inside the battery pack for wiring harness routing, thus preventing further improvement in the space utilization of module-less battery packs. Utility Model Content

[0004] This application provides a battery pack and electrical device that solves the problem of difficult battery removal in related technologies with non-module battery packs.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, this application provides a battery pack, comprising:

[0007] The box-shaped enclosure has a cavity.

[0008] A cooling plate is disposed in the cavity, and the cooling plate is located on the bottom wall of the box body;

[0009] A cell stack is disposed on the cooling plate;

[0010] A control component is disposed within the cavity, and the control component and the cell stack are arranged along a direction perpendicular to the depth of the cavity;

[0011] A flexible circuit board is electrically connected to the battery cell stack, and one end of the flexible circuit board extends to the control component and is electrically connected to the control component.

[0012] In some embodiments, the battery cell stack includes a bus and a plurality of battery cells, the plurality of battery cells being stacked along the thickness direction of the battery cells, the plurality of battery cells being electrically connected to the bus, and the flexible circuit board being electrically connected to the bus.

[0013] In some embodiments, the control component and the cell stack are distributed along the thickness direction of the cell, and the cavity includes a first cavity and a second cavity that are separated from each other, the cell stack is disposed in the first cavity, and the control component is disposed in the second cavity.

[0014] In some embodiments, the busbar is located on the side of the battery cell facing away from the bottom wall of the cavity. The flexible circuit board includes a first plate and a second plate. The first plate is connected to the second plate. The first plate is located on the side of the battery cell facing away from the bottom wall of the cavity and is electrically connected to the busbar. The second plate is bent relative to the first plate, and the end of the second plate facing away from the first plate is a connection end, which is inserted into the control component.

[0015] In some embodiments, the control component includes a housing and a battery distribution circuit board, the battery distribution circuit board being disposed within the housing, and the connection terminal being plugged into the battery distribution circuit board.

[0016] In some embodiments, the control component further includes a battery management circuit board disposed within the housing, and the number of connection terminals is two, one of which is plugged into the battery management circuit board.

[0017] In some embodiments, the battery pack further includes an adhesive that fills the space between the cell stack and the inner wall of the cavity to bond the cell stack to the housing.

[0018] In some embodiments, the housing includes a bottom shell and a top cover, the cavity is disposed in the bottom shell, the bottom shell also has an opening communicating with the cavity, the top cover is detachably connected to the bottom shell, and the top cover is disposed in the opening.

[0019] In some embodiments, the housing further includes multiple connectors, and the number of battery cell stacks is multiple, with the multiple battery cell stacks spaced apart along the thickness direction of the battery cells. The circumferential edge of the top cover is detachably connected to the bottom shell through the connectors.

[0020] Secondly, based on the battery pack described above, this application also provides an electrical device including the battery pack described above.

[0021] In the battery pack provided in this application, the cell stack is housed within a casing, which serves to protect the cell stack. The cell stack is positioned on a cooling plate, allowing the cooling plate to directly dissipate heat from the cell stack. The control component and the cell stack are arranged along the depth direction perpendicular to the cavity of the casing, ensuring that the overall thickness of the battery pack is not excessive, thus achieving a compact structure. The flexible circuit board is electrically connected to the control component at both the cell stack and the control component, eliminating the need for additional wiring harnesses for connecting the battery pack to the control component. Consequently, no additional space is required within the casing for wiring harnesses, allowing for a larger battery pack volume within the casing. Ultimately, this results in a more compact battery pack structure, higher space utilization, and a larger capacity.

[0022] The electrical equipment proposed in this application has a more compact structure due to the use of the aforementioned battery pack. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of a battery pack provided in an embodiment of this application;

[0025] Figure 2 A top view schematic diagram of a battery pack provided in an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the cell stack of the battery pack provided in the embodiments of this application;

[0027] Figure 4 This is a schematic diagram of the second plate of the battery pack provided in an embodiment of this application;

[0028] Figure 5 This is a schematic diagram of the control components of the battery pack provided in an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100 - Housing; 110 - Bottom shell; 120 - Top cover; 140 - Cavity; 141 - First cavity; 142 - Second cavity; 150 - Connector;

[0031] 200 - Cell stack; 210 - Cell; 220 - Busbar;

[0032] 300-Cooling plate;

[0033] 400 - Control components; 410 - Housing; 420 - Battery power distribution circuit board; 430 - Battery management circuit board;

[0034] 500 - Flexible circuit board; 510 - First board body; 520 - Second board body. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] A moduleless battery pack is a type of battery pack in which batteries are directly bonded to the casing using structural adhesive. By abandoning the traditional modular frame structure, it can improve the space utilization within the casing, allowing for a greater number of batteries to be installed inside, thus resulting in a more abundant power supply for the moduleless battery pack.

[0037] Currently, while module-less battery packs can improve space utilization, the connection between components such as the power distribution box inside the battery pack and the cell stack requires wiring harnesses. This necessitates reserving space inside the battery pack for wiring harness routing, thus preventing further improvement in the space utilization of module-less battery packs.

[0038] Furthermore, when the distribution box and battery pack are connected via wiring harnesses, poor contact and other malfunctions can easily occur if the battery pack vibrates or the wiring harness is slightly deformed.

[0039] In the battery pack proposed in this application, the cell stack is housed within a casing, which serves to protect the cell stack. The cell stack is positioned on a cooling plate, allowing the cooling plate to directly dissipate heat from the cell stack. The control component and the cell stack are arranged along the depth direction perpendicular to the cavity of the casing, ensuring that the overall thickness of the battery pack is not excessive, thus achieving a compact structure. The flexible circuit board is electrically connected to the control component at both the cell stack and the control component, eliminating the need for additional wiring harnesses for connecting the battery pack to the control component. Consequently, no additional space is required within the casing for wiring harnesses, allowing for a larger battery pack volume within the casing. Ultimately, this results in a more compact battery pack structure, higher space utilization, and a larger capacity.

[0040] The electrical equipment proposed in this application has a more compact structure due to the use of the aforementioned battery pack.

[0041] The battery pack and automobile provided in this application will be described in detail below with reference to specific embodiments.

[0042] This application provides an embodiment of a battery pack, with reference to... Figures 1 to 2 As shown, the battery pack includes a housing 100, a cell stack 200, a cooling plate 300, a control assembly 400, and a flexible circuit board 500. This battery pack can be used in electrical devices, including automobiles and energy storage devices.

[0043] The housing 100 is the basic component of the battery pack of this application. The housing 100 provides a mounting base for at least some other components of the battery pack and serves to protect those components. The housing 100 can be made of metal, giving it better structural strength, thus improving its durability and reliability. Alternatively, the housing 100 can be made of polymer materials, allowing it to maintain a certain structural strength while remaining relatively lightweight.

[0044] The housing 100 has a cavity 140, which can be used to install at least some other components of the battery pack. The housing 100 includes a bottom shell 110 and a top cover 120. The bottom shell 110 includes a base plate and a frame. The base plate is a plate-shaped structural member, and the frame is disposed along the circumference of the base plate at its edge. The top cover 120 is disposed opposite to the base plate and is connected to the frame so that the frame can be supported by the top cover 120. The base plate, the frame, and the top cover 120 can enclose to form the cavity 140 of the housing 100.

[0045] The cell stack 200 is disposed within the cavity 140 of the housing 100. Specifically, the cell stack 200 can be placed on a base plate, allowing the base plate to support the cell stack 200. The top cover 120 is opposite to the base plate, allowing the top cover 120 and the base plate to limit the height of the cell stack 200, preventing it from swaying in that direction. The frame can limit the horizontal movement of the cell stack 200, thus ensuring that the cell stack 200 is limited in all directions when disposed within the housing 100, maintaining its stability.

[0046] It should be understood that when the battery pack of this application is in continuous operation, especially during battery pack charging, the cell stack 200 will generate a large amount of heat, resulting in a high temperature of the cell stack 200 and potential damage. To solve this problem, the cooling plate 300 of this application can be disposed within the cavity 140 of the housing 100 and on one side of the bottom of the cell stack 200, such that the cooling plate 300 is positioned between the bottom wall of the cavity 140 of the housing 100 and the cell stack 200. The cooling plate 300 can be supported on the cell stack 200, so that the cooling plate 300 is in contact with the bottom wall of the cell stack 200. Specifically, the cooling plate 300 has cooling channels, and inlet and outlet ports connected to both ends of the cooling channels. Both the inlet and outlet ports can be connected to external coolant pipes, allowing low-temperature coolant to enter the cooling channels through the inlet port and return to the external coolant pipes through the outlet port. As the low-temperature coolant flows through the cooling channels, the heat generated by the battery cell stack 200 can be conducted to the coolant through the cooling plate 300 and absorbed by the coolant. After absorbing the heat from the battery cell stack 200, the coolant's temperature rises. The coolant then flows back to the external coolant pipes to dissipate heat and can re-form a low-temperature coolant. This low-temperature coolant can then flow back into the cooling channels through the first inlet to absorb the heat generated by the battery cell stack 200, thereby achieving the purpose of continuously dissipating heat from the battery cell stack 200.

[0047] When the battery pack of this application is used in a car, the first liquid inlet and the first liquid outlet of the cooling plate 300 can be connected to the cooling system of the car to input coolant into the cooling channel of the cooling plate 300.

[0048] The control component 400 is also disposed within the cavity 140 of the housing 100, and the control component 400 and the cell stack 200 are distributed along a direction perpendicular to the depth of the cavity 140. This allows the control component 400 and the cell stack 200 to utilize the lateral space of the cavity 140 of the housing 100, avoiding an excessively large height of the battery pack. The flexible circuit board 500 is electrically connected to the cell stack 200, with one end extending to the control component 400, allowing it to be close to the control component 400 and directly electrically connected. Correspondingly, no additional wiring harness is needed between the flexible circuit board 500 and the control component 400 for electrical connection, and no additional space is needed within the cavity 140 for wiring harness installation. The battery pack that can be housed within the housing 100 has a larger volume, ultimately resulting in a more compact battery pack structure, higher space utilization, and larger capacity.

[0049] In some implementations, reference Figure 3As shown, the battery cell stack 200 of this application includes a busbar 220 and a plurality of battery cells 210. The plurality of battery cells 210 are stacked along the thickness direction of the battery cells 210 within the cavity 140 and located on the cooling plate 300. The plurality of battery cells 210 are electrically connected, allowing the plurality of battery cells 210 to output electrical energy simultaneously. Specifically, the plurality of battery cells 210 can be electrically connected through the busbar 220. The stacking of the plurality of battery cells 210 along the thickness direction of the battery cells 210 makes the structure of the battery cell stack 200 relatively compact. Adjacent battery cells 210 can be bonded by an adhesive layer, allowing adjacent battery cells 210 to be fixed to each other. In this way, the plurality of battery cells 210 can be relatively fixed to form a battery cell stack 200 with a stable and reliable overall structure, resulting in better overall rigidity of the battery cell stack 200. By fixing the battery cell 210 with an adhesive layer, it is not necessary to fix the battery cell 210 with other frame structures, thus making the structure of the battery cell stack 200 more compact and lighter. At the same time, the space of the cavity 140 of the housing 100 can be fully utilized, allowing for a greater number of battery cell stacks 200 to be installed inside the housing 100.

[0050] In some implementations, reference Figure 1 As shown, the cavity 140 of the housing 100 of this application may include a first cavity 141 and a second cavity 142 separated from each other. The battery cell stack 200 may be disposed in the first cavity 141, and the control component 400 may be disposed in the second cavity 142. In this way, the battery cell stack 200 and the control component 400 can be separately disposed in the housing 100, preventing the battery cell stack 200 and the control component 400 from directly contacting each other and causing short circuits, thus achieving the purpose of protecting the battery cell stack 200 and the control component 400.

[0051] The first cavity 141 and the second cavity 142 can be distributed along the thickness direction of the battery cell 210. Correspondingly, the battery cell stack 200 and the control component 400 are also arranged along the thickness direction of the battery cell 210. This makes the distribution of the two in the horizontal direction more uniform and reduces the space waste of the cavity 140 of the housing 100.

[0052] Specifically, the housing 100 may also include a partition, which is disposed within the cavity 140 and can divide the cavity 140 into a first cavity 141 and a second cavity 142. The partition can also limit the positioning of the cell stack 200 and the control component 400, so that the cell stack 200 and the control component 400 can be disposed more stably and reliably within the cavity 140 of the housing 100.

[0053] In some implementations, reference Figure 3As shown, the busbar 220 of this application can be disposed on the side of the cell stack 200 facing away from the bottom wall of the cavity 140, so that the busbar 220 is located above the cell stack 200. In this way, the busbar 220 will not occupy the horizontal space of the cavity 140, so that the horizontal space of the cavity 140 can be fully used to arrange the cell stack 200 and the power distribution components, thereby further making the battery pack structure more compact in the horizontal direction.

[0054] Specifically, the battery cell 210 of this application has a positive tab and a negative tab. The positive tab and negative tab are the connection points between the battery cell 210 and external electrical devices, allowing the battery cell 210 to be charged and discharged individually. The busbar 220 is electrically connected to the positive tab and negative tab of the battery cell 210, which can be soldered. The positive tab and negative tab of the battery cell 210 are also located on the side of the battery cell 210 facing away from the bottom wall of the cavity 140, so that the positive tab and negative tab can be located close to the busbar 220, making it easy to connect the positive tab and negative tab to the busbar 220.

[0055] refer to Figures 3 to 4 As shown, the flexible circuit board 500 includes a first plate 510 and a second plate 520. The first plate 510 and the second plate 520 are connected. The first plate 510 is located on the side of the battery cell 210 facing away from the bottom wall of the cavity 140, and the first plate 510 is electrically connected to the busbar 220. The second plate 520 is bent relative to the first plate 510, and the end of the second plate 520 facing away from the first plate 510 is a connection end, which is inserted into the control assembly 400.

[0056] The first plate 510 extends along the thickness direction of the battery cell 210, and its two ends are respectively close to the two ends of the battery cell stack 200 in the thickness direction of the battery cell 210, so that the first plate 510 can be electrically connected to multiple batteries 210 of the battery cell stack 200. The second plate 520 is bent away from the insertion end of the first plate 510 toward the bottom wall of the cavity 140, so that the insertion end of the second plate 520 can be opposite to the control component 400, thereby allowing the insertion end of the second plate 520 to be inserted into the control component 400.

[0057] The second board 520 is connected to the control component 400 by a plug-in connection. Correspondingly, the control component 400 has a socket for the plug-in end to be inserted. The plug-in end of the second board 520 is inserted into the socket, so that the second board 520 is electrically connected to the control component 400.

[0058] In some implementations, reference Figures 4 to 5As shown, the control component 400 of this application may include a housing 410 and a battery distribution circuit board 420. The battery distribution circuit board 420 is disposed inside the housing 410, and the connection terminal is inserted into the battery distribution circuit board 420, so that the battery distribution circuit board 420 can be electrically connected to the cell stack 200. The battery distribution circuit board 420 enables the control component 400 to have a power distribution function. Thus, the control component 400 acts as the physical hub for the high-voltage power distribution of the battery pack, and is responsible for the energy routing management between the battery pack and external loads.

[0059] The outer casing 410 serves to protect the battery power distribution circuit board 420, making the electrical connection between the flexible circuit board 500 and the battery power distribution circuit board 420 more stable and reliable.

[0060] In some implementations, reference Figures 4 to 5 As shown, the control component 400 of this application may further include a battery management circuit board 430, which is disposed within the housing 410. The second board 520 has two connection terminals, one of which is inserted into the battery management circuit board 430. In this way, the flexible circuit board 500 can be electrically connected to both the battery distribution circuit board 420 and the battery management circuit board 430 simultaneously. The battery management circuit board 430 can monitor parameters such as voltage, temperature, and current of the cell stack 200 in real time, estimate the state of the cell 210 (such as SOC and SOH), and perform charge / discharge control, equalization management, thermal management, and fault diagnosis.

[0061] The outer casing 410 serves to protect the battery management circuit board 430, making the electrical connection between the flexible circuit board 500 and the battery management circuit board 430 more stable and reliable.

[0062] In some embodiments, to secure the cell stack 200 within the cavity 140 of the housing 100, the cell stack 200 is bonded to the housing 100 using an adhesive. Specifically, the adhesive can be a thermally conductive adhesive, which is applied between the cell stack 200 and the inner wall of the cavity 140 through a potting process. The thermally conductive adhesive has strong bonding properties and high tensile and shear strength, ensuring a stable and reliable fixation between the cell stack 200 and the housing 100.

[0063] In some implementations, reference Figure 3 As shown, the number of cell stacks 200 in this application can be multiple, and these multiple cell stacks 200 can also be electrically connected, specifically in series. All multiple cell stacks 200 are disposed within the cavity 140 of the housing 100, resulting in a larger capacity and better power supply performance for the battery pack of this application. The multiple cell stacks 200 can be spaced apart, creating gaps between adjacent cell stacks 200.

[0064] refer to Figure 2 As shown, the housing 100 of this application may also include multiple connectors 150, and the circumferential edge of the upper cover 120 is detachably connected to the bottom shell 110 through multiple connectors 150.

[0065] Specifically, multiple corresponding openings can be provided on the circumferential edges of the upper cover 120 and the bottom shell 110, and multiple connectors 150 can pass through the openings of the upper cover 120 and the bottom shell 110 to fix the upper cover 120 and the bottom shell 110 together. The connectors 150 can be bolts.

[0066] Based on the battery pack described above, this application also proposes an electrical device including the aforementioned battery pack. When the electrical device is a vehicle, the battery pack can be electrically connected to the vehicle's power system, such as an electric motor, thereby providing electrical energy to the vehicle. It should be noted that terms such as "an embodiment," "embodiment," "exemplary embodiment," and "some embodiments" mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when describing a specific feature, structure, or characteristic in conjunction with embodiments, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0067] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0068] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0069] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, include: The housing (100) has a cavity (140); A cooling plate (300) is disposed in the cavity (140), and the cooling plate (300) is located on the bottom wall of the housing (100); A cell stack (200) is disposed on the cooling plate (300); A control component (400) is disposed within the cavity (140), and the control component (400) and the cell stack (200) are arranged along a depth direction perpendicular to the cavity (140); A flexible circuit board (500) is electrically connected to the battery cell stack (200), and one end of the flexible circuit board (500) extends to the control component (400) and is electrically connected to the control component (400).

2. The battery pack according to claim 1, characterized in that, The battery cell stack (200) includes a bus (220) and a plurality of battery cells (210). The plurality of battery cells (210) are stacked along the thickness direction of the battery cells (210). The plurality of battery cells (210) are electrically connected to the bus (220). The flexible circuit board (500) is electrically connected to the bus (220).

3. The battery pack according to claim 2, characterized in that, The control component (400) and the cell stack (200) are distributed along the thickness direction of the cell (210). The cavity (140) includes a first cavity (141) and a second cavity (142) that are separated from each other. The cell stack (200) is disposed in the first cavity (141), and the control component (400) is disposed in the second cavity (142).

4. The battery pack according to claim 3, characterized in that, The busbar (220) is located on the side of the cell (210) facing away from the bottom wall of the cavity (140). The flexible circuit board (500) includes a first plate (510) and a second plate (520). The first plate (510) is connected to the second plate (520). The first plate (510) is located on the side of the cell (210) facing away from the bottom wall of the cavity (140), and the first plate (510) is electrically connected to the busbar (220). The second plate (520) is bent relative to the first plate (510), and the end of the second plate (520) facing away from the first plate (510) is a connection end, which is inserted into the control component (400).

5. The battery pack according to claim 4, characterized in that, The control component (400) includes a housing (410) and a battery power distribution circuit board (420), the battery power distribution circuit board (420) being disposed inside the housing (410), and the connection end being plugged into the battery power distribution circuit board (420).

6. The battery pack according to claim 5, characterized in that, The control component (400) further includes a battery management circuit board (430), which is disposed inside the housing (410). The number of connection terminals is two, and one of the two connection terminals is plugged into the battery management circuit board (430).

7. The battery pack according to any one of claims 1-6, characterized in that, The battery pack also includes an adhesive that fills the space between the cell stack (200) and the inner wall of the cavity (140) to bond the cell stack (200) to the housing (100).

8. The battery pack according to any one of claims 2-6, characterized in that, The housing (100) includes a bottom shell (110) and a top cover (120). The cavity (140) is disposed on the bottom shell (110). The bottom shell (110) also has an opening communicating with the cavity (140). The top cover (120) is detachably connected to the bottom shell (110) and is disposed on the opening.

9. The battery pack according to claim 8, characterized in that, The housing (100) also includes multiple connectors (150), and there are multiple battery cell stacks (200). The multiple battery cell stacks (200) are spaced apart along the thickness direction of the battery cell (210). The circumferential edge of the top cover (120) is detachably connected to the bottom shell (110) through the connectors (150).

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

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