Battery pack and electric device

Abstract

The utility model provides a kind of battery pack and electrical equipment, it is related to battery technical field, the battery pack includes at least two battery modules, first confluence piece, second confluence piece and circuit board assembly.The side of first confluence portion is laminated and attached in second confluence portion setting, the side of first confluence portion is connected with its one battery module, the side of second confluence portion is connected with another battery module, to make first confluence piece be located between two adjacent battery modules, second confluence piece is connected with one end of battery module, circuit board assembly is connected with first confluence piece and second confluence piece respectively.The first confluence portion of the utility model laminates and attaches second confluence portion, make structure be more compact, improve space utilization, more battery modules can be placed under the same space, reduce the situation that first confluence piece appears deviation or slack leads to poor contact, guarantee the structural strength of first confluence piece, solve the problem that the space layout of battery pack in prior art is unreasonable and capacity is limited.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery pack and electrical equipment. Background Technology

[0002] A battery pack refers to a complete energy storage device that combines multiple battery cells (individual cells) in series and parallel, and integrates multiple components to form a unified energy output function. It is widely used in electric vehicles, energy storage systems, drones, consumer electronics devices, and other fields. Currently, due to volume or size limitations, the space layout within battery packs is tight, and the compression of components within the battery pack may cause short circuits or poor contact, affecting the stability and performance of the battery pack. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a battery pack and electrical equipment, which aims to solve the technical problems of unreasonable spatial layout and limited capacity of battery packs in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] A first aspect of this utility model provides a battery pack, the battery pack comprising:

[0006] At least two battery modules;

[0007] The first busbar includes a first busbar portion and a second busbar portion connected to each other. One side of the first busbar portion is stacked and attached to the second busbar portion. The side of the first busbar portion away from the second busbar portion is connected to one of the battery modules. The side of the second busbar portion away from the first busbar portion is connected to another battery module, so that the first busbar portion is located between two adjacent battery modules.

[0008] The second busbar is connected to the end of the battery module away from the first busbar;

[0009] A circuit board assembly, wherein the circuit board assembly is fixedly connected to the first busbar and the second busbar respectively.

[0010] In one possible embodiment of the present invention, the first busbar further includes a bending portion located at the connection position between the first busbar and the second busbar, so that the first busbar and the second busbar are folded together by the bending portion.

[0011] In one possible embodiment of this utility model, the first busbar and the second busbar are hinged together.

[0012] In one possible embodiment of the present invention, any of the battery modules includes multiple cells, and the multiple cells of a single battery module are arranged in an array, and the cross-sectional shape of the battery module along the length direction of the battery module is triangular.

[0013] In one possible embodiment of the present invention, the battery pack further includes a separator that divides the plurality of cells of a single battery module into a first cell group and a second cell group. The first busbar includes a first sub-busbar and a second sub-busbar, both of which include a first busbar portion and a second busbar portion. The first sub-busbar is connected to the first cell group, and the second sub-busbar is connected to the second cell group.

[0014] In one possible embodiment of this utility model, the first sub-busbar has a triangular structure and the second sub-busbar has a linear structure.

[0015] In one possible embodiment of the present invention, the second busbar includes a third sub-busbar and a fourth sub-busbar, the third sub-busbar being connected to the end of the first battery cell assembly away from the first sub-busbar, and the fourth sub-busbar being connected to the end of the second battery cell assembly away from the second sub-busbar.

[0016] In one possible embodiment of the present invention, the battery pack further includes a sleeve and a package, the sleeve having openings at opposite ends, the package closing the openings, any of the battery modules being disposed within the sleeve, and the circuit board assembly being disposed within the sleeve.

[0017] In one possible embodiment of the present invention, the circuit board assembly includes a circuit board, a first insulating layer and a second insulating layer, the circuit board abutting between the first insulating layer and the second insulating layer, and the circuit board being soldered to the first busbar and the second busbar respectively.

[0018] A second aspect of this utility model provides an electrical device, including the battery pack described in any of the above embodiments.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a battery pack and electrical equipment in which at least two battery modules are connected to a circuit board assembly through a first busbar and a second busbar. The circuit board assembly is used to manage and control the two battery modules. The first busbar is stacked and attached to the second busbar, making the structure more compact and improving space utilization. More battery modules can be placed in the same space, reducing the possibility of misalignment or loosening of the first busbar leading to poor contact, and ensuring the structural strength of the first busbar. The first and second busbars of the first busbar are respectively connected to two adjacent battery modules, realizing the series and parallel connection of multiple battery modules to increase the battery pack capacity, thereby improving the stability and performance quality of the battery pack. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the battery pack provided in some embodiments of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the battery module of some battery packs according to this utility model;

[0023] Figure 3 This is a schematic diagram of the assembly structure of the first busbar of the battery pack provided in some embodiments of the present invention;

[0024] Figure 4 It shows Figure 2 Schematic diagram of the structure of part A in the middle;

[0025] Figure 5 This is a schematic diagram of the internal structure of the battery pack provided in some embodiments of the present invention;

[0026] Figure 6 This is a three-dimensional assembly structure diagram of the battery pack provided in some embodiments of the present invention.

[0027] Explanation of key component symbols;

[0028] 100-Battery pack; 110-Battery module; 111-Battery cell; 112-First cell group; 113-Second cell group; 120-First busbar; 121-First sub-busbar; 122-Second sub-busbar; 1211-First busbar section; 1212-Second busbar section; 1213-Bending section; 130-Second busbar; 131-Third sub-busbar; 132-Fourth sub-busbar; 140-Circuit board assembly; 141-Circuit board; 142-First insulating layer; 143-Second insulating layer; 144-Terminal; 150-Sleeve; 151-Encapsulation; 152-Opening; 160-Separator; X-Length direction. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] In related technologies, the limited space within a battery pack due to volume or size constraints can lead to a tight layout, and the compression of components within the battery pack may cause short circuits or poor contact, affecting the stability and performance of the battery pack.

[0037] Please refer to Figure 1 and Figure 2 As shown, in order to solve the above-mentioned technical problems, the embodiments of this application provide a battery pack 100, which includes at least two battery modules 110, a first busbar 120, a second busbar 130 and a circuit board assembly 140.

[0038] Specifically, in combination Figure 2 and Figure 3 As shown, the first busbar 120 includes a first busbar section 1211 and a second busbar section 1212 connected to each other. One side of the first busbar section 1211 is stacked and attached to the second busbar section 1212. The side of the first busbar section 1211 away from the second busbar section 1212 is connected to one of its battery modules 110, and the side of the second busbar section 1212 away from the first busbar section 1211 is connected to another battery module 110, so that the first busbar 120 is located between two adjacent battery modules 110.

[0039] In this embodiment, as Figure 2As shown, the second busbar 130 is connected to the end of the battery module 110 away from the first busbar 120. The circuit board assembly 140 is fixedly connected to the first busbar 120 and the second busbar 130 respectively. Correspondingly, at least two battery modules 110 are connected to the circuit board assembly 140 through the first busbar 120 and the second busbar 130. The circuit board assembly 140 is used to manage and control the battery modules 110. The first busbar 1211 is stacked and bonded to the second busbar 1212, making the structure more compact and improving the space utilization rate. More battery modules 110 can be placed in the same space, reducing the possibility of the first busbar 120 shifting or becoming loose and causing poor contact, and ensuring the structural strength of the first busbar 120. The first busbar 1211 and the second busbar 1212 of the first busbar 120 are respectively connected to two adjacent battery modules 110, realizing the series and parallel connection of multiple battery modules 110 to increase the capacity of the battery pack 100.

[0040] The first busbar 1211 is laminated to the second busbar 1212 on one side. This reduces the connection thickness between the first busbar 1211 and the second busbar 1212 and prevents them from becoming loose or shifting, thus ensuring the connection effect of the first busbar 120. The first busbar 1211 and the second busbar 1212 correspond to two adjacent battery modules 110 respectively. By arranging the two adjacent battery modules 110 side by side and shortening and controlling the connection thickness between the first busbar 1211 and the second busbar 1212, more battery modules 110 can be set up with the same size and specifications, thereby improving battery capacity and performance.

[0041] refer to Figure 1 and Figure 2 As shown, the battery pack 100 has a length direction X. For example, the length direction X is taken as the length direction X of the battery module 110. It is understood that the above definitions are only for ease of understanding the relative positional relationships of the parts in the battery pack 100 and should not be construed as limitations on this application.

[0042] In one embodiment, reference Figure 3As shown, optionally, the first busbar 120 further includes a bending portion 1213, which is located at the connection point between the first busbar 1211 and the second busbar 1212. This allows the first busbar 1211 and the second busbar 1212 to be folded together via the bending portion 1213. The deformable structure of the bending portion 1213 allows the first busbar 1211 and the second busbar 1212 to be folded at an angle around the bending portion 1213. One side of the first busbar 1211 is stacked and fitted with the second busbar 1212. The first busbar 1211 and the second busbar 1212 are adapted to the stacked arrangement of multiple battery modules 110, thereby reducing the length and space occupancy of the stacked battery modules 110. Furthermore, the manufacturing process of the first busbar 120 produces a planar busbar, replacing the complex three-dimensional forming process with folding, thus reducing production costs.

[0043] In one embodiment, reference Figure 2 As shown, optionally, any battery module 110 includes multiple battery cells 111. The multiple battery cells 111 of a single battery module 110 are arranged in an array, and the cross-sectional shape of the battery module 110 along its length x is triangular. This facilitates the stacking of multiple battery cells 111, giving the battery module 110 stronger structural strength and lighter weight, ensuring space utilization, and optimizing the center of gravity of the battery module 110. For example, the battery cell 111 is a cylindrical battery cell 111, and multiple cylindrical battery cells 111 are stacked to form a multi-layer structure, with the cross-sectional shape of the battery module 110 along its length x being triangular.

[0044] Optionally, combined Figure 2 and Figure 5 As shown, the battery pack 100 also includes a separator 160, which separates the multiple cells 111 of a single battery module 110 into a first cell group 112 and a second cell group 113. The separator 160 serves to insulate and insulate, improving the safety and heat dissipation efficiency of the single battery module 110. Figure 3 As shown, the first busbar 120 includes a first sub-busbar 121 and a second sub-busbar 122. Both the first sub-busbar 121 and the second sub-busbar 122 include a first busbar section 1211 and a second busbar section 1212. The first sub-busbar 121 is connected to the first cell group 112 and is used to manage the current of the first cell group 112. The second sub-busbar 122 is connected to the second cell group 113 and is used to manage the current of the second cell group 113. This reduces the impact of failure and damage of a single cell group on the battery pack 100 and is suitable for modular cell 111 expansion and cell group cascading.

[0045] For example, the partition 160 has a wave-shaped structure, and multiple battery cells 111 are arranged and matched with the size and shape of the partition 160. The wave-shaped partition 160 facilitates the assembly and positioning of multiple battery cells 111, provides a certain support for the battery cells 111, does not occupy additional space, and has a better technical effect.

[0046] Optionally, refer to Figure 2 As shown, the first sub-busbar 121 has a triangular structure, and the second sub-busbar 122 has a linear structure. The separator 160 divides multiple cells 111 into two groups: a first cell group 112 and a second cell group 113. The triangular structure of the first sub-busbar 121 corresponds to the first cell group 112, and the structure of the first sub-busbar 121 corresponds to the size and shape of the first cell group 112. The linear structure of the second sub-busbar 122 corresponds to the first cell group 112, and the structure of the second sub-busbar 122 corresponds to the size and shape of the second cell group 113. For example, a single battery module 110 has six cells 111. The first cell group 112 has three cells 111 stacked to form a triangular structure, and the second cell group 113 has three more cells 111 arranged linearly.

[0047] Optionally, such as Figure 4 As shown, the second busbar 130 includes a third sub-busbar 131 and a fourth sub-busbar 132. The third sub-busbar 131 is connected to the end of the first cell group 112 away from the first sub-busbar, and the fourth sub-busbar 132 is connected to the end of the second cell group 113 away from the second sub-busbar. The first cell group 112 and the second cell group 113 can be modularly replaced and maintained. Differentiated cell group management can be achieved by combining the shape and size of the first cell group 112 and the second cell group 113. For example, the first sub-bus 121 and the third sub-bus 131 both correspond to the first cell group 112, and the first sub-bus 121 and the third sub-bus 131 serve as the positive and negative busbars of the first cell group 112, respectively. The second sub-bus 122 and the fourth sub-bus 132 both correspond to the second cell group 113, and the second sub-bus 122 and the fourth sub-bus 132 serve as the positive and negative busbars of the second cell group 113, respectively.

[0048] In summary, at least two battery modules 110 in the battery pack 100 are connected to the circuit board assembly 140 via a first busbar 120 and a second busbar 130. The circuit board assembly 140 is used for the management and control of the two battery modules 110. The first busbar 1211 is stacked and bonded to the second busbar 1212, making the structure more compact and improving space utilization. More battery modules 110 can be placed in the same space, reducing the possibility of misalignment or loosening of the first busbar 120 leading to poor contact and ensuring the structural strength of the first busbar 120. The first busbar 1211 and the second busbar 1212 of the first busbar 120 are respectively connected to two adjacent battery modules 110, realizing the series and parallel connection of multiple battery modules 110 to increase the capacity of the battery pack 100, thereby improving the stability and performance quality of the battery pack 100.

[0049] Embodiments of this application also provide another battery pack 100, which includes at least two battery modules 110, a first busbar 120, a second busbar 130, and a circuit board assembly 140.

[0050] Specifically, in combination Figure 2 and Figure 3 As shown, the first busbar 120 includes a first busbar section 1211 and a second busbar section 1212 connected to each other. One side of the first busbar section 1211 is stacked and bonded to the second busbar section 1212. The side of the first busbar section 1211 opposite to the second busbar section 1212 is connected to one of its battery modules 110, and the side of the second busbar section 1212 opposite to the first busbar section 1211 is connected to another battery module 110, so that the first busbar 120 is located between two adjacent battery modules 110. Figure 2 As shown, the second busbar 130 is connected to the end of the battery module 110 away from the first busbar 120. The circuit board assembly 140 is fixedly connected to the first busbar 120 and the second busbar 130 respectively. Correspondingly, at least two battery modules 110 are connected to the circuit board assembly 140 through the first busbar 120 and the second busbar 130. The circuit board assembly 140 is used to manage and control the battery modules 110. The first busbar 1211 is stacked and bonded to the second busbar 1212, making the structure more compact and improving the space utilization rate. More battery modules 110 can be placed in the same space, reducing the possibility of the first busbar 120 shifting or becoming loose and causing poor contact, and ensuring the structural strength of the first busbar 120. The first busbar 1211 and the second busbar 1212 of the first busbar 120 are respectively connected to two adjacent battery modules 110, realizing the series and parallel connection of multiple battery modules 110 to increase the capacity of the battery pack 100.

[0051] It is understood that the battery module 110 can be connected to the circuit board assembly 140 through the first busbar 120 and the second busbar 130. For example, the first busbar 120 and the second busbar 130 are soldered onto the circuit board assembly 140 by resistance welding. The circuit board assembly 140 is used to manage and control the battery module 110. The first busbar 120 and the second busbar 130 serve as the current transmission path between the battery module 110 and the circuit board assembly 140. The structure is relatively compact, reducing the complexity of traditional wiring harnesses, improving space utilization, and enabling multiple battery modules 110 to be connected in series and parallel to balance the voltage and capacity requirements of the battery pack 100. For example, the positive and negative terminals of the battery module 110 can be connected through a busbar to form a high-voltage or high-capacity battery pack.

[0052] The number of battery modules 110 can be greater than two. Multiple battery modules 110 are connected one after the other in sequence. Of course, the number of battery modules 110 can be three, four, five or six. In this case, a first busbar 120 is provided between any two adjacent battery modules 110, and two second busbars 130 are located at the beginning and end of the connection of multiple battery modules 110, respectively, so as to realize the series and parallel connection of multiple battery modules 110 to improve the capacity performance of the battery pack.

[0053] In one embodiment, reference Figure 3 As shown, optionally, the first busbar 1211 and the second busbar 1212 are hinged together. One end of the first busbar 1211 is connected to the second busbar 1212 by a hinge. The hinge can replace the bent part 1213, realizing a soft connection between the first busbar 1211 and the second busbar 1212. It has better mechanical stress and adapts the first busbar 1211 and the second busbar 1212 to correspond to two adjacent battery modules 110. Compared with a fixed rigid structure, it has a certain degree of adjustment freedom. When the two adjacent battery modules 110 experience thermal expansion, the positions of the first busbar 1211 and the second busbar 1212 can be finely adjusted to adapt to a more complex spatial layout.

[0054] In related technologies, traditional battery packs include components such as a casing, battery modules, and circuit boards. The casing serves two purposes: waterproofing and dustproofing, and improving the battery pack's impact resistance. However, traditional battery packs with casings tend to occupy too much space, making them unsuitable for smart hardware devices with limited assembly space and failing to meet application requirements. To control battery design dimensions, the number of cells within the battery pack is reduced. However, reducing the number of cells significantly weakens the battery pack's performance and lowers its capacity.

[0055] To address the aforementioned technical problem of excessive space occupation in the battery pack casing, alternatively, based on any of the above embodiments, reference can be made to... Figure 1 As shown, the battery pack 100 also includes a sleeve 150 and an encapsulation component 151. The sleeve 150 has openings 152 at its opposite ends, and the encapsulation component 151 closes the openings 152. Each battery module 110 is disposed inside the sleeve 150, and the circuit board assembly 140 is disposed inside the sleeve 150, so that the sleeve 150 can wrap the battery module 110 and the circuit board assembly 140, providing protection while ensuring the structural strength of the battery pack 100 and reducing space occupancy. The encapsulation component 151 is used to close the openings 152 at both ends of the sleeve 150. The encapsulation component 151 can be made of insulating material to achieve the function of sealing the inside of the sleeve 150, improving the sealing and waterproof performance of the battery pack 100. Compared with the outer shell, using the sleeve 150 can save space and at the same time meet the requirements of the battery pack 100 to meet the drop test. For example, the sleeve 150 is a heat-shrinkable sleeve 150. The heat-shrinkable sleeve 150 tightly wraps the battery module 110 and the circuit board assembly 140 by heating and shrinking, which takes into account both the protection function and the compact space requirements of the battery pack 100. At the same time, the heat-shrinkable sleeve 150 has the ability to shrink quickly to adapt to automated production.

[0056] In one embodiment, alternatively, such as Figure 6 As shown, the circuit board assembly 140 includes a circuit board 141, a first insulating layer 142, and a second insulating layer 143. The circuit board 141 abuts between the first insulating layer 142 and the second insulating layer 143, and is soldered to the first busbar 120 and the second busbar 130, respectively. The first insulating layer 142 and the second insulating layer 143 provide protective insulation to the opposite sides of the circuit board 141 and have a certain buffering effect. The first insulating layer 142 and the second insulating layer 143 isolate the non-soldered areas of the circuit board 141 and the busbars, preventing short circuits and ensuring a reliable connection between the circuit board 141 and the busbars. For example, the circuit board assembly 140 also includes a terminal block 144, through which the battery pack can supply power to external devices.

[0057] An embodiment of this utility model also provides an electrical device, which includes the battery pack 100 in the above embodiment. The battery pack 100 serves as the power supply for the electrical device. The electrical device containing the battery pack 100 has all the beneficial effects of the battery pack 100, which will not be described in detail here.

[0058] For example, the aforementioned electrical equipment may include electronic devices, electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc., but are not limited to these.

[0059] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0060] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: At least two battery modules (110); The first busbar (120) includes a first busbar (1211) and a second busbar (1212) connected to each other. One side of the first busbar (1211) is stacked and attached to the second busbar (1212). The side of the first busbar (1211) away from the second busbar (1212) is connected to one of the battery modules (110). The side of the second busbar (1212) away from the first busbar (1211) is connected to another battery module (110), so that the first busbar (120) is located between two adjacent battery modules (110). The second busbar (130) is connected to the end of the battery module (110) away from the first busbar (120); Circuit board assembly (140) is fixedly connected to the first busbar (120) and the second busbar (130) respectively.

2. The battery pack according to claim 1, characterized in that, The first busbar (120) further includes a bending portion (1213), which is located at the connection position between the first busbar (1211) and the second busbar (1212) so that the first busbar (1211) and the second busbar (1212) are folded together by the bending portion (1213).

3. The battery pack according to claim 1, characterized in that, The first busbar (1211) and the second busbar (1212) are hinged together.

4. The battery pack according to any one of claims 1 to 3, characterized in that, Each of the battery modules (110) includes multiple cells (111), and the multiple cells (111) of a single battery module (110) are arranged in an array. The cross-sectional shape of the battery module (110) along the length direction of the battery module (110) is triangular.

5. The battery pack according to claim 4, characterized in that, It also includes a separator (160) that divides the plurality of cells (111) of a single battery module (110) into a first cell group (112) and a second cell group (113). The first busbar (120) includes a first sub-busbar (121) and a second sub-busbar (122). Both the first sub-busbar (121) and the second sub-busbar (122) include a first busbar section (1211) and a second busbar section (1212). The first sub-busbar (121) is connected to the first cell group (112), and the second sub-busbar (122) is connected to the second cell group (113).

6. The battery pack according to claim 5, characterized in that, The first sub-busbar (121) has a triangular structure, and the second sub-busbar (122) has a linear structure.

7. The battery pack according to claim 5, characterized in that, The second busbar (130) includes a third sub-busbar (131) and a fourth sub-busbar (132). The third sub-busbar (131) is connected to the end of the first cell assembly (112) away from the first sub-busbar (121), and the fourth sub-busbar (132) is connected to the end of the second cell assembly (113) away from the second sub-busbar (122).

8. The battery pack according to any one of claims 1 to 3, characterized in that, It also includes a sleeve (150) and a package (151). The sleeve (150) has openings (152) at its opposite ends. The package (151) closes the openings (152). Each of the battery modules (110) is disposed inside the sleeve (150). The circuit board assembly (140) is disposed inside the sleeve (150).

9. The battery pack according to any one of claims 1 to 3, characterized in that, The circuit board assembly (140) includes a circuit board (141), a first insulating layer (142) and a second insulating layer (143). The circuit board (141) abuts between the first insulating layer (142) and the second insulating layer (143), and the circuit board (141) is soldered to the first busbar (120) and the second busbar (130) respectively.

10. An electrical appliance, characterized in that, Includes the battery pack (100) as described in any one of claims 1 to 9.

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