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 comprises a box body, a cell stack and a collection assembly. The cell stack is arranged in the box body, and the box body can protect the cell stack. A plurality of connecting lines of the collection assembly are electrically connected with a plurality of collection parts. The collection parts are connected with the cell stack, so that the collection parts can collect signal parameters of the cell stack. The collection parts can be connected with external signal processing equipment through the connecting lines. The plurality of connecting lines are distributed and connected along a first direction, so that the plurality of connecting lines are connected as a whole to be relatively fixed, so that the collection assembly is a whole structure. When the battery pack of the application is prepared, the plurality of connecting lines connected as a whole can be overlapped on the cell stack, so that the plurality of collection parts are connected with the cell stack. In this way, the plurality of connecting lines do not need to be arranged separately, so that the preparation efficiency of the battery pack of the application is higher.

Description

Technical Field

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

[0002] To improve the safety of the battery pack, it is necessary to collect various parameters of the battery pack during the charging and discharging process to understand the operating status of the battery pack. This way, when abnormal conditions occur in the battery pack, they can be detected in time and appropriate measures can be taken.

[0003] Currently, data acquisition for battery packs is accomplished through acquisition devices. Since battery packs contain a large number of cells, a corresponding number of acquisition devices are also required. These acquisition devices need to be connected to data processing devices via wiring harnesses. The large number of wiring harnesses complicates and hinders the wiring arrangement process during battery pack manufacturing, resulting in low manufacturing efficiency. Summary of the Invention

[0004] This application provides a battery pack and an electrical device that solves the problem of low manufacturing efficiency of battery packs in related technologies.

[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 cell stack is disposed within the cavity;

[0009] The acquisition component includes multiple connecting lines and multiple acquisition units. The multiple connecting lines are electrically connected to the multiple acquisition units respectively. The multiple connecting lines are distributed along a first direction and adjacent connecting lines are connected. The multiple acquisition units are all connected to the battery cell stack. The multiple connecting lines are attached to the battery cell stack.

[0010] In some embodiments, the cell stack includes a plurality of cells stacked along a second direction, the plurality of cells being electrically connected, the second direction being the thickness direction of the cells and intersecting with the first direction, the length direction of the connecting line being the second direction, and the plurality of acquisition portions being connected to the plurality of cells respectively.

[0011] In some embodiments, the plurality of acquisition units include voltage acquisition units and temperature acquisition units. There are multiple voltage acquisition units, each of which is electrically connected to a plurality of battery cells. The temperature acquisition units are attached to the surface of the battery cells.

[0012] In some embodiments, among the plurality of connecting lines, the connecting line connected to the voltage acquisition unit is a voltage connecting line. One end of the plurality of voltage connecting lines is distributed along the first direction and connected sequentially. The other end of the plurality of voltage connecting lines is connected to the voltage acquisition unit, and the other end of the plurality of voltage connecting lines is bent so that the plurality of voltage acquisition units are electrically connected to the plurality of battery cells respectively.

[0013] In some embodiments, among the plurality of connecting lines, the connecting line connected to the temperature acquisition unit is a temperature connecting line, and along the first direction, the opposite sides of the temperature connecting line are respectively connected to two voltage connecting lines.

[0014] In some embodiments, the cell stack further includes a bus, in which adjacent cells are electrically connected via the bus, and the voltage acquisition unit is electrically connected to the bus.

[0015] In some embodiments, the voltage acquisition unit includes a first snap-fit ​​portion, and the busbar includes a second snap-fit ​​portion, wherein the first snap-fit ​​portion and the second snap-fit ​​portion engage to enable the voltage acquisition unit to be detachably electrically connected to the busbar.

[0016] In some embodiments, the battery cell includes a positive tab and a negative tab, both of which are disposed on the side of the battery cell facing away from the bottom wall of the cavity. The busbar is connected to the side of the battery cell facing away from the bottom wall of the cavity, and the busbar is electrically connected to the positive tab and the negative tab of two adjacent battery cells. A plurality of connecting lines are also connected to the side of the battery cell facing away from the bottom wall of the cavity.

[0017] In some embodiments, the positive electrode tab and the negative electrode tab are spaced apart along the second direction, and a plurality of the connecting lines are located between the positive electrode tab and the negative electrode tab.

[0018] Secondly, based on the battery pack described above, this application also provides an electrical device including the battery pack described above.

[0019] In the battery pack provided in this application, the cell stack is housed within a casing, which serves to protect the cell stack. Multiple connecting lines of the acquisition component are electrically connected to multiple acquisition units, which are connected to the cell stack, enabling them to acquire signal parameters from the cell stack. These acquisition units can also be connected to external signal processing equipment via connecting lines. The multiple connecting lines are distributed and connected along a first direction, forming a single, relatively fixed structure, thus making the acquisition component a single, integrated structure. When manufacturing the battery pack of this application, the multiple integrated connecting lines can be overlapped onto the cell stack, connecting the multiple acquisition units to the cell stack. This eliminates the need to separately manage the multiple connecting lines, resulting in higher manufacturing efficiency for the battery pack of this application.

[0020] The electrical equipment provided in this application utilizes the aforementioned battery pack, resulting in higher battery pack manufacturing efficiency and improved overall equipment manufacturing efficiency. Attached Figure Description

[0021] 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.

[0022] Figure 1 A schematic diagram of a battery pack provided in an embodiment of this application;

[0023] Figure 2 for Figure 1 A magnified view of area A in the middle;

[0024] Figure 3 A schematic diagram of the data acquisition component of the battery pack provided in an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the adhesive portion of the data acquisition component of the battery pack provided in an embodiment of this application;

[0026] Figure 5 A schematic diagram of the busbar of the battery pack provided in the embodiments of this application;

[0027] Figure 6 This is a schematic diagram of the data collection unit of the battery pack provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100 - Box body; 110 - Base plate; 120 - Side beam; 130 - Limiting beam; 140 - Cavity;

[0030] 200 - Cell stack; 210 - Cell; 220 - Busbar; 221 - Second snap-fit ​​part;

[0031] 300 - Acquisition component; 310 - Connecting wire; 310a - Voltage connecting wire; 310b - Temperature connecting wire; 320 - Acquisition unit; 320a - Voltage acquisition unit; 320b - Temperature acquisition unit; 321 - First snap-fit ​​part; 330 - Adhesive part. Detailed Implementation

[0032] 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.

[0033] To improve the safety of the battery pack, it is necessary to collect various parameters of the battery pack during the charging and discharging process to understand the operating status of the battery pack. This way, when abnormal conditions occur in the battery pack, they can be detected in time and appropriate measures can be taken.

[0034] Currently, data acquisition for battery packs is accomplished through acquisition devices. Since battery packs contain a large number of cells, a corresponding number of acquisition devices are also required. These acquisition devices need to be connected to data processing devices via wiring harnesses. The large number of wiring harnesses complicates and hinders the wiring arrangement process during battery pack manufacturing, resulting in low manufacturing efficiency.

[0035] In the battery pack proposed in this application, the cell stack is housed within a casing, which serves to protect the cell stack. Multiple connecting lines of the acquisition component are electrically connected to multiple acquisition units, which are connected to the cell stack, enabling them to acquire signal parameters from the cell stack. The acquisition units can also be connected to external signal processing equipment via connecting lines. The multiple connecting lines are distributed and connected along a first direction, forming a single, relatively fixed structure, thus making the acquisition component a single, integrated structure. When manufacturing the battery pack of this application, the multiple integrated connecting lines can be overlapped onto the cell stack, connecting the multiple acquisition units to the cell stack. This eliminates the need to separately manage the multiple connecting lines, resulting in higher manufacturing efficiency for the battery pack of this application.

[0036] The electrical equipment proposed in this application utilizes the aforementioned battery pack, resulting in higher battery pack manufacturing efficiency and improved overall equipment manufacturing efficiency.

[0037] The battery pack and automobile provided in this application will be described in detail below with reference to specific embodiments.

[0038] This application discloses a battery pack, with reference to... Figures 1 to 3 As shown, the battery pack includes a housing 100, a cell stack 200, and a data acquisition assembly 300. This battery pack can be used in electrical devices, such as vehicles and energy storage devices.

[0039] 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.

[0040] 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 base plate 110, side beams 120, and a top cover. The base plate 110 is a plate-shaped structural member. The side beams 120 are arranged circumferentially along the edge of the base plate 110. The top cover is disposed opposite to the base plate 110 and is connected to the side beams 120, so that the side beams 120 can be supported by the top cover. The base plate 110, side beams 120, and top cover can enclose and form the cavity 140 of the housing 100.

[0041] The cell stack 200 is disposed within the cavity 140 of the housing 100. Specifically, the cell stack 200 can be placed on the bottom plate 110 of the bottom shell, so that the bottom plate 110 can support the cell stack 200. The top cover is opposite to the bottom plate 110, so that the top cover and the bottom plate 110 can limit the cell stack 200 in the height direction, preventing the cell stack 200 from swaying in the height direction. The side beam 120 can limit the cell stack 200 in the horizontal direction, so that the cell stack 200 is limited in all directions when disposed within the housing 100, thereby keeping the cell stack 200 stable.

[0042] refer to Figure 2 and Figure 3 As shown, the acquisition component 300 includes multiple connecting lines 310 and multiple acquisition units 320. The multiple connecting lines 310 are electrically connected to the multiple acquisition units 320 respectively. The multiple connecting lines 310 are distributed along a first direction, and adjacent connecting lines 310 are connected. The multiple acquisition units 320 are all connected to the cell stack 200, and the multiple connecting lines 310 are attached to the cell stack 200.

[0043] Specifically, the multiple connecting lines 310 of the acquisition component 300 are electrically connected to multiple acquisition units 320. The acquisition units 320 are connected to the cell stack 200, enabling them to acquire signal parameters from the cell stack 200. The acquisition units 320 can also be connected to external signal processing equipment via the connecting lines 310. The multiple connecting lines 310 are distributed and connected along a first direction, forming a single, relatively fixed structure, thus making the acquisition component 300 a single, integrated structure. When manufacturing the battery pack of this application, the multiple integrated connecting lines 310 can be overlapped onto the cell stack 200, connecting the multiple acquisition units 320 to the cell stack 200. This eliminates the need to separately manage the multiple connecting lines 310, resulting in higher manufacturing efficiency for the battery pack of this application.

[0044] In some implementations, reference Figure 2 As shown, the battery cell stack 200 of this application includes multiple battery cells 210, which are stacked on a base plate 110 along a second direction, the thickness direction of which is the second direction. The multiple battery cells 210 are electrically connected, allowing them to output electrical energy simultaneously. Stacking the multiple battery cells 210 along their thickness direction makes the structure of the battery cell stack 200 relatively compact. Adjacent battery cells 210 can be bonded together with an adhesive layer, allowing them to be fixed to each other. This relatively fixed structure of multiple battery cells 210 forms a stable and reliable battery cell stack 200, resulting in better overall rigidity. By fixing the battery cells 210 with an adhesive layer, it is unnecessary to use 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, so that more cells 210 of the cell stack 200 can be installed in the housing 100, thereby increasing the battery pack capacity of this application.

[0045] The first direction and the second direction are intersecting, specifically, the first direction and the second direction are perpendicular. Multiple connecting lines 310 are distributed along a direction perpendicular to the thickness direction of the battery cell 210. The length direction of the multiple connecting lines 310 is consistent with the first direction, allowing the multiple connecting lines 310 to span multiple battery cells 210, so that each part of the connecting line 310 is opposite to each battery cell 210 along its length. This ensures that each battery cell 210 can be supported by the connecting lines 310, thus maintaining the stability of the connecting lines 310.

[0046] Multiple acquisition units 320 are connected to multiple battery cells 210 respectively, allowing each acquisition unit 320 to collect parameters during the charging and discharging process of the multiple battery cells 210. Each acquisition unit 320 is also connected to multiple connecting lines 310, which span across the multiple battery cells 210. This allows the acquisition unit 320 to connect to the portion of the corresponding connecting line 310 closest to the corresponding battery cell 210, making it easier to connect. This eliminates the need for an additional intermediate connection structure between the acquisition unit 320 and the corresponding battery cell 210, resulting in a more compact battery pack design.

[0047] In some implementations, reference Figure 3 As shown, the plurality of acquisition units 320 of this application may include voltage acquisition units 320a and temperature acquisition units 320b. There are multiple voltage acquisition units 320a, and the multiple voltage acquisition units 320a are electrically connected to multiple battery cells 210 respectively. The temperature acquisition units 320b are attached to the surface of the battery cell 210.

[0048] The number of voltage acquisition units 320a can correspond to the number of battery cells 210, so that multiple voltage acquisition units 320a can acquire the voltage parameters of multiple battery cells 210 respectively, and transmit the voltage parameters of the battery cells 210 to the external processing device through the connecting line 310. The temperature acquisition unit 320b is attached to the surface of the battery cell 210, so that the temperature acquisition unit 320b can contact the battery cell 210, so that the temperature acquisition unit 320b can acquire the temperature parameters of the battery cell 210, and transmit the temperature parameters of the battery cell 210 to the external processing device through the connecting line 310.

[0049] In some implementations, reference Figure 3 As shown, among the multiple connecting lines 310 of this application, the connecting line 310 connected to the voltage acquisition unit 320a is a voltage connecting line 310a. The first ends of the multiple voltage connecting lines 310a are distributed along the first direction and connected in sequence. The second ends of the multiple voltage connecting lines 310a are connected to the voltage acquisition unit 320a, and the second ends of the multiple voltage connecting lines 310a are bent relative to the first ends, so that the multiple voltage acquisition units 320a are electrically connected to the multiple battery cells 210 respectively.

[0050] It should be understood that the multiple battery cells 210 are distributed along the second direction, and the connection points between the multiple battery cells 210 and the voltage acquisition unit 320a are also correspondingly distributed along the second direction. The second ends of the multiple voltage connection lines 310a are bent relative to the first ends, so that the second ends of the multiple voltage connection lines 310a are spaced apart along the second direction. In this way, the multiple voltage acquisition units 320a connected to the second ends of the voltage connection lines 310a can be close to the multiple battery cells 210 respectively, so that the multiple voltage acquisition units 320a can be easily electrically connected to the multiple battery cells 210 to acquire the voltage of the battery cells 210.

[0051] In some implementations, reference Figure 3 As shown, among the multiple connection lines 310 of this application, the connection line 310 connected to the temperature acquisition unit 320b is the temperature connection line 310b. Along the first direction, the opposite sides of the temperature connection line 310b are respectively connected to two voltage connection lines 310a. Specifically, the temperature connection line 310b is located in the middle of the overall structure formed by the multiple connection lines 310, and the temperature information of the battery cell 210 acquired by the temperature acquisition unit 320b can be transmitted to the processing device through the temperature connection line 310b.

[0052] In some implementations, reference Figure 3 As shown, in order to electrically connect multiple battery cells 210, the battery cell stack 200 also includes busbars 220. There are multiple busbars 220, which can electrically connect adjacent battery cells 210 so that multiple battery cells 210 can be connected in series.

[0053] The battery cell 210 has two tabs, one positive and one negative. These tabs are the connection points between the battery cell 210 and external electrical devices, allowing the battery cell 210 to charge and discharge individually. The busbar 220 is electrically connected to the positive and negative tabs of the battery cell 210, which can be soldered. The positive and negative tabs of the battery cell 210 are located on the side of the battery cell 210 facing away from the bottom wall of the cavity 140. Correspondingly, the busbar 220 is also located on the side of the battery cell 210 facing away from the bottom wall of the cavity 140, allowing the positive and negative tabs to be positioned close to the busbar 220 for easy connection.

[0054] The voltage acquisition unit 320a is electrically connected to the bus 220, allowing it to be electrically connected to the battery cell 210 via the bus 220. This enables the voltage acquisition unit 320a to acquire the voltage parameters of the battery cell 210. Consequently, the voltage acquisition unit 320a does not need to be connected to the positive and negative tabs of the battery cell 210, allowing...

[0055] In some implementations, reference Figure 3 , Figure 5 and Figure 6As shown, the voltage acquisition unit 320a of this application includes a first latching part 321, and the bus 220 includes a second latching part 221. The first latching part 321 and the second latching part 221 are latched together to make the voltage acquisition unit 320a and the bus 220 detachably electrically connected. This detachable connection of the first latching part 321 and the second latching part 221 makes the bus 220 and the voltage acquisition unit 320a detachably connected, thereby facilitating the connection and disconnection of the bus 220 and the voltage acquisition unit 320a, improving the assembly efficiency of the bus 220 and the voltage acquisition unit 320a, and thus improving the manufacturing efficiency of the battery pack of this application.

[0056] Specifically, the second latching portion 221 of the busbar 220 is a slot formed on the surface of the busbar 220, which extends through the busbar 220. The first latching portion 321 is a latch on the voltage acquisition unit 320a, and the first latching portion 321 is located at the end of the voltage acquisition unit 320a. The latch can be engaged in the slot, thereby making it convenient to connect and disconnect the voltage acquisition unit 320a from the busbar 220.

[0057] Of course, the first latching part 321 of the voltage acquisition unit 320a can also be a slot formed on the surface of the voltage acquisition unit 320a, with the slot penetrating the voltage acquisition unit 320a. The second latching part can be a buckle on the busbar 220, and the second latching part 221 can be located at the end of the busbar 220. The buckle can be fastened into the slot, thereby making it convenient to connect and disconnect the voltage acquisition unit 320a from the busbar 220.

[0058] In some embodiments, since the positive and negative tabs of the battery cell 210 are located on the side of the battery cell 210 facing away from the bottom wall of the cavity 140, the busbar 220 is also located on the side of the battery cell 210 facing away from the bottom wall of the cavity 140, allowing the busbar 220 to be easily electrically connected to the positive and negative tabs of the battery cell 210. Multiple connecting wires 310 are also attached to the side of the battery cell 210 facing away from the bottom wall of the cavity 140, allowing the connecting wires 310 to be positioned close to the busbar 220. Correspondingly, the voltage acquisition unit 320a can be easily connected to the connecting wires 310 and the busbar 220, thus reducing the length of the connecting wires 310 and making the battery pack structure of this application more compact.

[0059] In some embodiments, the positive and negative tabs of the battery cell 210 are spaced apart along a second direction, and a plurality of connecting wires 310 are located between the positive and negative tabs. In this way, the connecting wires 310 can be arranged in the space between the positive and negative tabs on the surface of the battery cell 210, and the connecting wires 310 can avoid the positive and negative tabs, thus preventing the positive and negative tabs from interfering with each other.

[0060] In some implementations, reference Figure 4As shown, the acquisition component 300 also includes an adhesive part 330, through which the connecting wire 310 can be bonded to the battery cell 210, so that the connecting wire 310 can be fixed on the battery cell 210.

[0061] 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.

[0062] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, 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 a specific feature, structure, or characteristic is described in connection with an embodiment, 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.

[0063] 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.

[0064] 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).

[0065] 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.

[0066] 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 cell stack (200) is disposed within the cavity (140); The acquisition component (300) includes multiple connecting lines (310) and multiple acquisition units (320). The multiple connecting lines (310) are electrically connected to the multiple acquisition units (320) respectively. The multiple connecting lines (310) are distributed along a first direction and adjacent connecting lines (310) are connected. The multiple acquisition units (320) are all connected to the battery cell stack (200). The multiple connecting lines (310) overlap the battery cell stack (200).

2. The battery pack according to claim 1, characterized in that, The battery cell stack (200) includes a plurality of battery cells (210), which are stacked along a second direction and electrically connected. The second direction is the thickness direction of the battery cells (210) and intersects with the first direction. The length direction of the connecting line (310) is the second direction. The plurality of acquisition units (320) are respectively connected to the plurality of battery cells (210).

3. The battery pack according to claim 2, characterized in that, The plurality of acquisition units (320) include voltage acquisition units (320a) and temperature acquisition units (320b). There are multiple voltage acquisition units (320a), and the multiple voltage acquisition units (320a) are electrically connected to the multiple battery cells (210) respectively. The temperature acquisition units (320b) are attached to the surface of the battery cells (210).

4. The battery pack according to claim 3, characterized in that, Among the plurality of connecting lines (310), the connecting line (310) connected to the voltage acquisition unit (320a) is a voltage connecting line (310). One end of the plurality of voltage connecting lines (310) is distributed along the first direction and connected in sequence. The other end of the plurality of voltage connecting lines (310) is connected to the voltage acquisition unit (320a), and the other end of the plurality of voltage connecting lines (310) is bent so that the plurality of voltage acquisition units (320a) are electrically connected to the plurality of battery cells (210) respectively.

5. The battery pack according to claim 4, characterized in that, Among the multiple connecting lines (310), the connecting line (310) connected to the temperature acquisition unit (320b) is the temperature connecting line (310). Along the first direction, the opposite sides of the temperature connecting line (310) are respectively connected to two voltage connecting lines (310).

6. The battery pack according to any one of claims 3-5, characterized in that, The cell stack (200) also includes a bus (220). Among the multiple cells (210), adjacent cells (210) are electrically connected through the bus (220). The voltage acquisition unit (320a) is electrically connected to the bus (220).

7. The battery pack according to claim 6, characterized in that, The voltage acquisition unit (320a) includes a first snap-fit ​​part (321), and the bus (220) includes a second snap-fit ​​part (221). The first snap-fit ​​part (321) and the second snap-fit ​​part (221) are snap-fitted together so that the voltage acquisition unit (320a) and the bus (220) are detachably electrically connected.

8. The battery pack according to claim 7, characterized in that, The battery cell (210) includes a positive tab and a negative tab, both of which are disposed on the side of the battery cell (210) facing away from the bottom wall of the cavity (140). The busbar (220) is attached to the side of the battery cell (210) facing away from the bottom wall of the cavity (140), and the busbar (220) is electrically connected to the positive tab and the negative tab of two adjacent battery cells (210). Multiple connecting lines (310) are also attached to the side of the battery cell (210) facing away from the bottom wall of the cavity (140).

9. The battery pack according to claim 8, characterized in that, The positive electrode tab and the negative electrode tab are spaced apart along the second direction, and a plurality of the connecting lines (310) are located between the positive electrode tab and the negative electrode tab.

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

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