Battery and electric device

Abstract

A battery (100) and an electric device. The battery (100) comprises a battery cell group (1) and a plurality of busbars (30). The battery cell group (1) comprises a plurality of battery cells (10) stacked in a first direction (X). The plurality of busbars (30) are electrically connected to the plurality of battery cells (10); the plurality of busbars (30) include a first busbar (30a) and a second busbar (30b); the first busbar (30a) comprises a first busbar layer (31) and a second busbar layer (32) that are stacked and connected to each other, the first busbar layer (31) connecting at least two battery cells (10) arranged in the first direction (X); and the second busbar (30b) connects at least two battery cells (10) arranged in the first direction (X); the thickness of the second busbar (30b) is greater than the thickness of the first busbar layer (31), and the thickness of the second busbar (30b) is greater than the thickness of the second busbar layer (32). The first busbar layer (31) comprises a first main body portion (311), a first connecting portion (312), and a second main body portion (313). The battery (100) provided in the present application, which comprises the laminated first busbar (30a) and the single-layer second busbar (30b), can meet a relatively high overall current-carrying capacity of the busbars (30) while also achieving relatively high resistance to expansion and vibration impact forces.

Description

Batteries and electrical devices

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202421606388.5, entitled "Battery and Electrical Device", filed on July 9, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery manufacturing technology, and in particular to batteries and electrical devices. Background Technology

[0004] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Batteries can include nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, and rechargeable alkaline zinc-manganese batteries.

[0005] In the development of battery technology, how to improve battery reliability is a technical problem that urgently needs to be solved.

[0006] Summary of the Invention

[0007] This application provides a battery and an electrical device that aims to improve the reliability of the battery to a certain extent.

[0008] In a first aspect, this application proposes a battery comprising a battery cell assembly and a plurality of busbars. The battery cell assembly comprises a plurality of battery cells stacked along a first direction. The plurality of busbars electrically connect the plurality of battery cells, and the plurality of busbars include a first busbar and a second busbar. The first busbar comprises a first bus layer and a second bus layer stacked and connected, the first bus layer connecting at least two battery cells arranged along the first direction, and the second busbar connecting at least two battery cells arranged along the first direction. The thickness of the second busbar is greater than the thickness of the first bus layer. The first bus layer comprises a first main body portion, a first connecting portion, and a second main body portion. The first connecting portion is located between and connected to the first main body portion and the second main body portion. The first main body portion and the second main body portion are arranged along the first direction and connected to different battery cells.

[0009] The battery provided in this application includes multiple busbars, including a stacked first busbar and a single-layer second busbar. The stacked first busbar and the single-layer second busbar are designed together and adjusted according to the actual needs of the battery. This design can meet the large current carrying capacity of the busbar as a whole, and also has high resistance to expansion and shock. As a result, the busbar as a whole is not easily damaged, thereby improving the overall reliability of the battery. The reasonable combination of the stacked first busbar and the single-layer second busbar can also reduce the manufacturing cost of the battery.

[0010] According to one embodiment of this application, at least two battery cells at the end of the battery cell pack along a first direction are connected to a first busbar.

[0011] In these alternative embodiments, the expansion forces of battery cells at different locations within the battery cell pack vary, especially those located at the ends along the first direction. The busbar connected to these cells is more prone to cracking or even breakage, leading to busbar failure. Therefore, placing the first busbar at the end provides it with higher resistance to expansion forces and vibration impacts, reducing the risk of overall busbar failure.

[0012] According to one embodiment of this application, a plurality of buses includes two first buses and at least one second bus, wherein, in a first direction, the second bus is located between the two first buses.

[0013] In these alternative embodiments, a first busbar is provided at the end and a second busbar is provided at the middle part between the ends, which can reduce the overall manufacturing difficulty of the busbar and save production costs.

[0014] According to one embodiment of this application, the first busbar includes two second bus layers, which are located on the same side of the first bus layer away from the battery cell, and the two second bus layers are spaced apart along a second direction, wherein the second direction, the first direction, and the stacking direction of the first bus layer and the second bus layer are perpendicular to each other.

[0015] In these alternative embodiments, the first busbar can be designed according to the internal structure of the battery, making the first busbar highly adaptable. Furthermore, the cross-sectional area of ​​a portion of the first busbar can be increased, thereby increasing the current-carrying capacity of the first busbar.

[0016] According to one embodiment of this application, the portion of the first bus layer that is not stacked with the second bus layer is connected to the battery cell.

[0017] In these alternative embodiments, the portion of the first busbar that is not stacked with the second busbar is connected to the battery cell to reduce the stiffness of the connection between the first busbar and the battery cell. This allows the connection portion of the first busbar to deform along with the deformation of other components when the battery cell expands, thereby reducing the possibility of cracking or even breaking at the connection between the first busbar and other components.

[0018] According to one embodiment of this application, the first busbar further includes a bend, which is connected to the first bus layer and the second bus layer.

[0019] In these alternative embodiments, this configuration effectively increases the overall current-carrying area of ​​the first busbar and also improves the overall structural strength of the first busbar. Furthermore, by incorporating the bending portion, a one-piece molded structure for the first busbar can be achieved.

[0020] According to one embodiment of this application, the bent portion is not directly connected to the first connecting portion.

[0021] In these alternative embodiments, the bent portion is not connected to the first connecting portion to reduce the difficulty of deforming the first connecting portion, making it easier for the first connecting portion to release the expansion force, thereby improving the structural strength of the first busbar layer and reducing the risk of breakage or cracking.

[0022] According to one embodiment of this application, the first connecting portion protrudes at least partially relative to the first main body portion and the second main body portion in the direction toward the battery cell; the first busbar layer is provided with a recess, the recess corresponding to the position of the first connecting portion, and the recess is recessed relative to the surface of the first main body portion away from the battery cell.

[0023] In these alternative embodiments, this configuration further increases the ability of the first connection to release expansion force.

[0024] According to one embodiment of this application, the second busbar includes a first stacked portion, a second connecting portion, and a second stacked portion. The first stacked portion is stacked with the first main body portion and connected by a bending portion. The second stacked portion is stacked with the second main body portion and connected by a bending portion. The second connecting portion is connected to the first stacked portion and the second stacked portion. In the stacking direction of the first busbar and the second busbar, the second connecting portion and the first connecting portion at least partially overlap.

[0025] In these alternative embodiments, the configuration is such that the first busbar has a high overall flow area and can improve the structural strength of the first busbar.

[0026] According to one embodiment of this application, the first busbar, the bend, and the second busbar are integrally formed.

[0027] In these alternative embodiments, the first busbar is integrally molded, which gives the first busbar high structural strength and high production efficiency.

[0028] According to one embodiment of this application, the thickness of the second busbar is equal to the sum of the thickness of the first busbar layer and the thickness of the second busbar layer.

[0029] In these alternative embodiments, the thickness of the second bus is the same as the maximum thickness of the first bus, so that the current carrying capacity of the second bus is similar to that of the first bus, thereby enabling the battery as a whole to maintain a high charging speed.

[0030] Secondly, this application provides an electrical device including the aforementioned battery, which is used to provide electrical energy.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0032] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0033] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this application;

[0034] Figure 2 is a schematic diagram of the explosion of the battery in Figure 1.

[0035] Figure 3 is a schematic diagram of the structure of a portion of the battery according to some embodiments of this application;

[0036] Figure 4 is a schematic diagram of the structure of the first busbar of a battery according to some embodiments of this application;

[0037] Figure 5 is a schematic diagram of the structure of the first busbar of a battery according to some other embodiments of this application.

[0038] The accompanying drawings may not be drawn to scale.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1000, vehicles;

[0041] 100. Battery; 200. Controller; 300. Motor;

[0042] 1. Battery cell assembly; 21. First housing section; 22. Second housing section;

[0043] 10. Battery cell; 30. Busbar; 30a. First busbar; 31. First busbar layer; 311. First main body; 312. First connecting part; 313. Second main body; 32. Second busbar layer; 321. First stacked part; 322. Second connecting part; 323. Second stacked part; 33. Bending part; 30b. Second busbar;

[0044] First direction x; second direction y; stacking direction z. Detailed Implementation

[0045] 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 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.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0047] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0050] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0051] In this application, "multiple" means two or more (including two).

[0052] In some embodiments, multiple battery cells arranged in a battery cell group are specifically connected in series / parallel via multiple busbars. The busbars are connected to the electrode terminals of the battery cells. Within the limited space of the battery, the multiple busbars are tightly connected. During the cyclic expansion of the battery cells, the electrode terminals of each battery cell will shift, and each busbar will be subjected to a significant expansion force. Furthermore, the expansion force of battery cells in different regions is not entirely the same, resulting in differences in the expansion force borne by some busbars. Therefore, the busbars subjected to greater expansion forces are more prone to damage, leading to a decrease in the overall current-carrying capacity of the busbars, causing risks such as overheating and ablation, and reducing the reliability of the battery. The above statements are only for providing background information related to this application and do not necessarily constitute prior art.

[0053] In view of the above problems, the inventors, after in-depth research, proposed a battery with multiple busbars including a stacked first busbar and a single-layer second busbar. The stacked first busbar and the single-layer second busbar are designed together and adjusted according to the actual needs of the battery. This design can meet the large current carrying capacity of the busbar as a whole, and also has high resistance to expansion and shock. As a result, the busbar as a whole is not easily damaged, thereby improving the overall reliability of the battery. The reasonable combination of the stacked first busbar and the single-layer second busbar can also reduce the manufacturing cost of the battery.

[0054] Batteries can be used in vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0055] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0056] Referring to Figure 1, one embodiment of this application provides a vehicle 1000. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. In one embodiment of this application, the vehicle 1000 may include a motor 300, a controller 200, and a battery 100. The controller 200 is used to control the battery 100 to supply power to the motor 300. The motor 300 is connected to the wheels via a transmission mechanism, thereby driving the vehicle 1000. The battery 100 can serve as the driving power source for the vehicle 1000, replacing or partially replacing gasoline or natural gas to provide driving power. In one example, the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. In one example, the battery 100 can serve as the operating power source for the vehicle 1000's electrical system. Exemplarily, the battery 100 can be used to meet the power needs of the vehicle 1000 during startup, navigation, and operation.

[0057] Figure 2 is a schematic diagram of the battery in Figure 1 after an explosion. As shown in Figure 2, battery 100 can refer to a single physical module comprising multiple battery cells 10 to provide higher voltage and capacity.

[0058] In some embodiments, the battery 100 may be a battery pack.

[0059] As an example, battery 100 includes a housing and battery cell 10, with the battery cell 10 housed within the housing.

[0060] The housing can be a component that houses the individual battery cells 10. The housing provides space for the individual battery cells 10, and the housing can adopt various structures.

[0061] In some embodiments, the housing may include a first housing portion 21 and a second housing portion 22, which overlap each other, and together define a receiving space for accommodating the battery cell 10. The second housing portion 22 may be a hollow structure with one open end, and the first housing portion 21 may be a plate-like structure, with the first housing portion 21 covering the open side of the second housing portion 22 to form a housing with a receiving space. Alternatively, both the first housing portion 21 and the second housing portion 22 may be hollow structures with one open side, with the open side of the first housing portion 21 covering the open side of the second housing portion 22 to form a housing with a receiving space. Of course, the first housing portion 21 and the second housing portion 22 may be of various shapes, such as cylinders, cuboids, etc.

[0062] To improve the sealing performance after the first housing part 21 and the second housing part 22 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 21 and the second housing part 22.

[0063] Assuming that the first box section 21 covers the top of the second box section 22, the first box section 21 can also be called the upper box cover, and the second box section 22 can also be called the lower box.

[0064] Referring to Figures 3 to 5, Figure 3 is a schematic diagram of the structure of a portion of a battery according to some embodiments of this application; Figure 4 is a schematic diagram of the structure of the first busbar of a battery according to some embodiments of this application; and Figure 5 is a schematic diagram of the structure of the first busbar of a battery according to other embodiments of this application.

[0065] In a first aspect, as shown in Figures 3 to 5, this application proposes a battery 100, which includes a battery cell group 1 and a plurality of busbars 30. The battery cell group 1 includes a plurality of battery cells 10 stacked along a first direction x. The plurality of busbars 30 electrically connect the plurality of battery cells 10. The plurality of busbars 30 include a first busbar 30a and a second busbar 30b. The first busbar 30a includes a first bus layer 31 and a second bus layer 32 stacked and connected. The first bus layer 31 connects at least two battery cells 10 arranged along the first direction x. The second busbar 30b connects at least two battery cells 10 arranged along the first direction x. The thickness of the second busbar 30b is greater than the thickness of the first bus layer 31, and the thickness of the second busbar 30b is greater than the thickness of the second bus layer 32. The first busbar 31 includes a first main body 311, a first connecting part 312, and a second main body 313. The first connecting part 312 is located between the first main body 311 and the second main body 313 and is connected to the first main body 311 and the second main body 313. The first main body 311 and the second main body 313 are arranged along the first direction x and connected to different battery cells 10.

[0066] In a battery, there can be one or more battery cell groups 1. If there are multiple battery cell groups 1, they can be arranged along the second direction y. The battery cell group 1 includes multiple battery cells 10 stacked along the first direction x. The multiple battery cells 10 can be connected in series, in parallel, or in a mixed manner. A mixed manner means that the multiple battery cells 10 are connected in both series and parallel.

[0067] Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the battery cell group 1 composed of multiple battery cells 10 can be housed in the box; of course, multiple battery cells 10 can also be connected in series, parallel, or in a mixed manner to form a battery cell group 1, and then the multiple battery cell groups 1 can be connected in series, parallel, or in a mixed manner to form a whole and housed in the box.

[0068] Multiple battery cells 10 in the battery can be electrically connected through multiple busbars 30 to achieve parallel, series, or mixed connection of multiple battery cells 10 in the battery cell group 1. There are multiple busbars 30, and each busbar 30 is used to electrically connect at least two battery cells 10.

[0069] Optionally, bus 30 may be made of a conductive material; for example, bus 30 may be made of a metallic material, such as aluminum or copper.

[0070] Optionally, multiple busbars 30 are set along the first direction x.

[0071] For example, the battery cell group 1 includes a plurality of battery cells 10 stacked along a first direction x. The plurality of battery cells 10 are arranged in series for illustration. Each battery cell 10 includes a positive electrode terminal and a negative electrode terminal. The positive electrode terminal of one of two adjacent battery cells 10 is electrically connected to the negative electrode terminal of the other battery cell 10 through a busbar 30.

[0072] In embodiments of this application, the plurality of busbars 30 include a first busbar 30a and a second busbar 30b. The first busbar 30a includes a first busbar layer 31 and a second busbar layer 32 that are stacked and connected. This can be understood as the first busbar 30a having a layered structure, and the second busbar 30b having a single-layer structure. The first busbar 30a includes a first busbar layer 31 and a second busbar layer 32 that are stacked and connected, and the thickness of the first busbar layer 31 is less than the thickness of the second busbar 30b, and the thickness of the second busbar layer 32 is less than the thickness of the second busbar 30b. The first busbar 30a has a layered structure with relatively thin layers, which can effectively improve the overall deformation energy absorption capacity and structural strength of the second busbar 30b structure. This allows the second busbar 30b to reduce the force it receives by deforming and absorbing energy when subjected to a large force, thereby reducing damage to the structure of the second busbar 30b. Therefore, the first busbar 30a can be located in the region of the battery cell 10 where the expansion and deformation are greater, and the second busbar 30b can be located in the region of the battery cell 10 where the expansion and deformation are less. Furthermore, the first busbar layer 31 and the second busbar layer 32 are stacked and connected, which increases the cross-sectional area of ​​a portion of the first busbar 30a, thereby increasing the current-carrying capacity of the first busbar 30a. In addition, the thickness of the second busbar 30b is greater than the thickness of the first busbar layer 31, and the thickness of the second busbar 30b is greater than the thickness of the second busbar layer 32, so that the multiple busbars 30 as a whole have a high current-carrying capacity.

[0073] Multiple busbars 30 include a stacked first busbar 30a and a single-layered second busbar 30b. Compared to a busbar 30 that is only stacked, this configuration can meet the requirements for resistance to expansion forces while reducing the overall manufacturing cost of the busbar. Compared to a single-layered busbar, it can improve the resistance to expansion forces.

[0074] Optionally, the first busbar 31 and the second busbar 32 are stacked, and in the stacking direction z of the first busbar 31 and the second busbar 32, the projected area of ​​the second busbar 32 in the first busbar 31 is smaller than that in the second busbar 32.

[0075] For example, the first busbar 31 includes an overlapping region and a non-overlapping region. The overlapping region is used to overlap with the second busbar 32 along the stacking direction z, and the non-overlapping region is used to not overlap with the second busbar 32 along the stacking direction z. The thickness of the first busbar 30a located in the overlapping region is greater than the thickness of the first busbar 30a located in the non-overlapping region. The non-overlapping region can be used to connect the battery cell 10.

[0076] The thickness of the second busbar 30b is greater than the thickness of the first busbar layer 31, and the thickness of the second busbar 30b is greater than the thickness of the second busbar layer 32. Specifically, the thickness of the second busbar 30b is greater than the sum of the thicknesses of the first busbar layer 31 and the second busbar layer 32; or, the thickness of the second busbar 30b is less than the sum of the thicknesses of the first busbar layer 31 and the second busbar layer 32; or, the thickness of the second busbar 30b is equal to the sum of the thicknesses of the first busbar layer 31 and the second busbar layer 32.

[0077] In embodiments of this application, the first main body portion 311 and the second main body portion 313 are connected to different battery cells 10, and the different battery cells 10 are electrically connected. The first connecting portion 312 is used to connect the first main body portion 311 and the second main body portion 313, so that current can flow.

[0078] When a battery cell 10 expands, the electrode terminals on different battery cells 10 will shift, causing the first busbar 31 as a whole to be subjected to a large expansion force. The first connection portion 312 is not connected to the battery cell 10. The first connection portion 312 can absorb the expansion force through deformation, thereby reducing the stress on the first busbar 30a as a whole. It can also reduce the reaction force on the battery cell 10, thereby reducing the risk of deformation and damage to the battery cell 10.

[0079] The battery 100 provided in this application includes multiple busbars 30, including a stacked first busbar 30a and a single-layer second busbar 30b. The stacked first busbar 30a and the single-layer second busbar 30b are designed together and adjusted according to the actual needs of the battery 100. This design can meet the large current carrying capacity of the busbar 30 as a whole, and also have high resistance to expansion and vibration. As a result, the busbar 30 as a whole is not easily damaged, thereby improving the overall reliability of the battery 100. The reasonable combination of the stacked first busbar 30a and the single-layer second busbar 30b can also reduce the manufacturing cost of the battery 100.

[0080] According to one embodiment of this application, as shown in FIG3, at least two battery cells 10 at the end of the battery cell group 1 along the first direction x are connected to the first busbar 31.

[0081] For example, two battery cells 10 at one end of the battery cell group 1 along the first direction x are connected to the first busbar 31, and other battery cells 10 are connected to a plurality of second busbars 30b. Two adjacent battery cells 10 along the first direction x are connected to a corresponding second busbar 30b.

[0082] For example, two battery cells 10 at both ends of the battery cell group 1 along the first direction x are connected to the first busbar 31, and the battery cell 10 in the middle is connected to a plurality of second busbars 30b. Two adjacent battery cells 10 along the first direction x are connected to a corresponding second busbar 30b.

[0083] In these alternative embodiments, the expansion forces of battery cells 10 at different locations in the battery cell pack 1 vary, especially those battery cells 10 located at the ends along the first direction x. The busbar 30 connected to these ends is more prone to cracking or even breakage, potentially leading to busbar 30 failure. Therefore, placing a first busbar 30a at the end provides higher resistance to expansion forces and vibration impacts, reducing the risk of overall busbar 30 failure.

[0084] According to one embodiment of this application, as shown in FIG3, a plurality of busbars 30 include two first busbars 30a and at least one second busbar 30b, wherein the second busbar 30b is located between the two first busbars 30a in a first direction x.

[0085] For example, the multiple busbars 30 include two first busbars 30a and three second busbars 30b. The battery cell group 1 includes ten battery cells 10 stacked along a first direction x. In the first direction x, the second busbars 30b are located between the two first busbars 30a. The first busbar layer 31 of the first busbars 30a connects two battery cells 10 located at the ends along the first direction x. The second busbars 30b connect two adjacent battery cells 10.

[0086] In these alternative embodiments, a first busbar 30a is provided at one end, and a second busbar 30b is provided at the middle part between the ends, which can reduce the overall manufacturing difficulty of the busbar 30 and save production costs.

[0087] According to one embodiment of this application, as shown in Figures 3 and 4, the first busbar 30a includes two second busbar layers 32. The two second busbar layers 32 are located on the same side of the first busbar layer 31 away from the battery cell 10, and the two second busbar layers 32 are spaced apart along the second direction y. The second direction y, the first direction x, and the stacking direction z of the first busbar layer 31 and the second busbar layer 32 are perpendicular to each other.

[0088] In embodiments of this application, the first busbar 30a includes a first bus layer 31 and two second bus layers 32. The two second bus layers 32 are located on the same side of the first bus layer 31 away from the battery cell 10, and are stacked with different regions of the first bus layer 31. The structures of the two second bus layers 32 may be the same or different. The stacked areas of the two second bus layers 32 and the first bus layer 31 may be the same or different.

[0089] In these alternative embodiments, the first busbar 30a can be designed according to the internal structure of the battery, making the first busbar 30a highly adaptable. Furthermore, the cross-sectional area of ​​a portion of the first busbar 30a can be increased, thereby increasing the current-carrying capacity of the first busbar 30a.

[0090] According to one embodiment of this application, the portion of the first busbar 31 that is not stacked with the second busbar 32 is connected to the battery cell 10.

[0091] The portion of the first busbar 31 that is not stacked with the second busbar 32 is connected to the battery cell 10. This can be understood as the first busbar 31 including an overlapping region and a non-overlapping region. The overlapping region is stacked with the second busbar 32, while the non-overlapping region is not stacked with the second busbar 32. The non-overlapping region can be connected to the battery cell 10.

[0092] Specifically, the battery cell 10 is provided with electrode terminals, and the first busbar 31 is electrically connected to the battery cell 10 through the electrode terminals.

[0093] Optionally, the shape of the portion of the first busbar 31 that is not stacked with the second busbar 32 can match the projected shape of the electrode terminal along the stacking direction z.

[0094] For example, the projection shape of the electrode terminal along the stacking direction z is circular, and the shape of the portion of the first bus layer 31 that is not stacked with the second bus layer 32 is circular.

[0095] For example, the projection shape of the electrode terminal along the stacking direction z is rectangular, and the shape of the portion of the first busbar 31 that is not stacked with the second busbar 32 is rectangular.

[0096] Optionally, the area of ​​the portion of the first busbar 31 that does not overlap with the second busbar 32 is greater than the projected area of ​​the electrode terminal along the stacking direction z.

[0097] Specifically, the portion of the first busbar 31 that does not overlap with the second busbar 32 can be fixedly connected to the electrode terminals by means of snap-fitting, bonding or welding.

[0098] Optionally, the portion of the first busbar 31 that is not stacked with the second busbar 32 is welded to the battery cell 10.

[0099] In these alternative embodiments, the portion of the first busbar 31 that is not stacked with the second busbar 32 is connected to the battery cell 10 to reduce the stiffness of the connection between the first busbar 31 and the battery cell 10. This allows the connection portion of the first busbar 31 to deform along with the deformation of other components when the battery cell 10 expands, thereby reducing the possibility of cracking or even breaking at the connection between the first busbar 30a and other components.

[0100] According to one embodiment of this application, as shown in Figures 3 and 4, the first busbar 30a further includes a bend 33, which is connected to the first busbar layer 31 and the second busbar layer 32.

[0101] In the embodiments of this application, the first busbar 30a includes one or more bends 33, and the first bus layer 31 is connected to the second bus layer 32 through one or more bends 33.

[0102] For example, the first busbar 30a includes a plurality of bends 33, which are disposed on one side of the first busbar layer 31. Alternatively, the plurality of bends 33 may also be disposed on different sides of the first busbar layer 31, for example, on opposite sides of the first busbar layer 31 along the second direction y, wherein the second direction y, the first direction x, and the stacking direction z are perpendicular to each other.

[0103] In these alternative embodiments, this configuration effectively increases the overall current-carrying area of ​​the first busbar 30a and also improves the overall structural strength of the first busbar 30a. Furthermore, by providing the bending portion 33, a one-piece molded structure of the first busbar 30a can be achieved.

[0104] According to one embodiment of this application, as shown in Figures 3 and 5, the bent portion 33 is not directly connected to the first connecting portion 312.

[0105] The fact that the bent portion 33 is not connected to the first connecting portion 312 can be understood as the bent portion 33 being connected to the first main body portion 311; or the bent portion 33 being connected to the second main body portion 313; or the bent portion 33 being connected to both the first main body portion 311 and the second main body portion 313.

[0106] In these alternative embodiments, the bend 33 is not connected to the first connecting portion 312 to reduce the difficulty of deforming the first connecting portion 312, making it easier for the first connecting portion 312 to release the expansion force, thereby improving the structural strength of the first busbar 31 and reducing the risk of breakage or cracking.

[0107] According to one embodiment of this application, as shown in Figures 3 and 5, the first connecting portion 312 protrudes at least partially relative to the first main body portion 311 and the second main body portion 313 in the direction toward the battery cell 10. The first busbar layer 31 is provided with a recess corresponding to the position of the first connecting portion 312, and the recess is recessed relative to the surface of the first main body portion 311 away from the battery cell 10.

[0108] Specifically, the first connecting portion 312 protrudes towards the battery cell 10. The first connecting portion 312 is located in the gap area between two adjacent battery cells 10, which can save space for setting up the busbar 30 and the battery cell 10. For example, the first connecting portion 312 has a protrusion, and the first busbar layer 31 has a recess. The recess corresponds to the position of the first connecting portion 312, and the recess is recessed relative to the surface of the first main body 311 away from the battery cell 10. The recess and the protrusion can provide a certain buffering effect between the first main body 311 and the second main body 313. When the first main body 311 and the second main body 313 are subjected to expansion force, a certain amount of expansion can be absorbed by the angle change between the bottom wall and the side wall of the recess. The first connecting portion 312 will undergo further deformation without causing the first main body 311 and the second main body 313 to break.

[0109] Optionally, the first connecting portion 312 may be made of an elastic material. The material itself effectively increases the upper limit of the expansion force that the first main body portion 311 and the second main body portion 313 can withstand, further increasing the reliability of the connection.

[0110] In these alternative embodiments, this configuration further increases the ability of the first connection 312 to release expansion force.

[0111] According to one embodiment of this application, as shown in Figures 3 and 5, the second busbar 32 includes a first stacked portion 321, a second connecting portion 322, and a second stacked portion 323. The first stacked portion 321 is stacked with the first main body portion 311 and connected by a bending portion 33. The second stacked portion 323 is stacked with the second main body portion 313 and connected by a bending portion 33. The second connecting portion 322 is connected to the first stacked portion 321 and the second stacked portion 323. In the stacking direction z of the first busbar 31 and the second busbar 32, the second connecting portion 322 at least partially overlaps with the first connecting portion 312.

[0112] The second busbar 32 includes a first stacked portion 321, a second connecting portion 322, and a second stacked portion 323. The first stacked portion 321 is connected to the first main body portion 311 via a bending portion 33, and the first stacked portion 321 is stacked with the first main body portion 311. The projected area of ​​the first stacked portion 321 on the first main body portion 311 is smaller than the area of ​​the first main body portion 311. The portion of the first main body portion 311 that is not stacked with the first stacked portion 321 can be used to connect the battery cell 10. The second stacked portion 323 is connected to the second main body portion 313 via a bending portion 33, and the second stacked portion 323 is stacked with the second main body portion 313. The projected area of ​​the second stacked portion 323 on the second main body portion 313 is smaller than the area of ​​the second main body portion 313. The portion of the second main body portion 313 that is not stacked with the second stacked portion 323 can be used to connect the battery cell 10. The second connecting portion 322 is connected to the first stacked portion 321 and the second stacked portion 323. In the stacking direction z of the first busbar 31 and the second busbar 32, the second connecting portion 322 at least partially overlaps with the first connecting portion 312. The second connecting portion 322 may have a clearance fit with the first connecting portion 312, or the second connecting portion 322 may be fitted to the first connecting portion 312.

[0113] Optionally, the second connecting portion 322 is at least partially recessed relative to the first stacked portion 321 and the second stacked portion 323 in the direction toward the battery cell 10. In this way, the first connecting portion 312 and the second connecting portion 322 fit together to form a double-recessed structure, which reduces the probability of damage to the first busbar 30a when subjected to greater expansion force.

[0114] In these alternative embodiments, the first busbar 30a is configured such that it has a high overall flow area and can improve the structural strength of the first busbar 30a.

[0115] According to one embodiment of this application, the first busbar 31, the bend 33, and the second busbar 32 are integrally formed structures.

[0116] For example, the substrate is stacked to form the first busbar 30a by a continuous stamping process.

[0117] For example, the substrate is a plate-like structure, which is bent via a bending axis to make the first part of the substrate adhere to the first part of the substrate, wherein the first part of the substrate forms a first busbar 31, the bent portion 33 is formed by the substrate forming a bent portion 33, and the second part of the substrate forms a second busbar 32.

[0118] In these alternative embodiments, the first busbar 30a has an integrally molded structure, which gives the first busbar 30a high structural strength and high production efficiency.

[0119] According to one embodiment of this application, the second busbar 30b includes a first main body, a third connecting portion, and a second main body. The first connecting portion 312 is located between and connected to the first and second main bodies. The first and second main bodies are disposed along a first direction x and connected to different battery cells 10. The bent portion 33 is not connected to the third connecting portion.

[0120] Optionally, the second busbar 30b has a structure that is substantially the same as that of the first busbar layer 31.

[0121] According to one embodiment of this application, the thickness of the second busbar 30b is equal to the sum of the thickness of the first busbar layer 31 and the thickness of the second busbar layer 32.

[0122] In these alternative embodiments, the thickness of the second bus 30b is the same as the maximum thickness of the first bus 30a, so that the current carrying capacity of the second bus 30b and the first bus 30a is similar, thereby enabling the battery to maintain a high charging speed as a whole.

[0123] Secondly, this application provides an electrical device including the aforementioned battery, which is used to provide electrical energy.

[0124] According to some embodiments of this application, referring to Figures 3 and 5, this application provides a battery 100, which includes a battery cell group 1 and a plurality of busbars 30.

[0125] The battery cell group 1 includes a plurality of battery cells 10 stacked along a first direction x.

[0126] Multiple busbars 30 electrically connect multiple battery cells 10. Each busbar 30 includes a bend 33, two first busbars 30a, and at least one second busbar 30b. In a first direction x, the second busbar 30b is located between the two first busbars 30a. A portion of the first busbar layer 31 that is not stacked with the second busbar layer 32 is connected to the battery cell 10.

[0127] The first busbar 30a includes a first busbar layer 31 and a second busbar layer 32 stacked and connected. The first busbar layer 31 includes a first main body portion 311, a first connecting portion 312, and a second main body portion 313. The first connecting portion 312 is located between and connected to the first main body portion 311 and the second main body portion 313. The first main body portion 311 and the second main body portion 313 are arranged along a first direction x and connected to different battery cells 10. The bent portion 33 is not directly connected to the first connecting portion 312. The first connecting portion 312 protrudes at least partially relative to the first main body portion 311 and the second main body portion 313 in the direction toward the battery cell 10. The first busbar layer 31 has a recess that corresponds to the position of the first connecting portion 312 and is recessed relative to the surface of the first main body portion 311 away from the surface of the battery cell 10. The second busbar layer 32 includes a first stacked portion 321, a second connecting portion 322, and a second stacked portion 323. The first stacked portion 321 is stacked with the first main body portion 311 and connected by a bending portion 33. The second stacked portion 323 is stacked with the second main body portion 313 and connected by a bending portion 33. The second connecting portion 322 connects the first stacked portion 321 and the second stacked portion 323. In the stacking direction z of the first busbar layer 31 and the second busbar layer 32, the second connecting portion 322 at least partially overlaps with the first connecting portion 312. The first busbar layer 31, the bending portion 33, and the second busbar layer 32 are integrally formed structures.

[0128] The thickness of the second busbar 30b is equal to the sum of the thickness of the first busbar layer 31 and the thickness of the second busbar layer 32.

[0129] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, comprising: A battery cell pack includes multiple battery cells stacked along a first direction; Multiple busbars electrically connect the multiple battery cells. The multiple busbars include a first busbar and a second busbar. The first busbar includes a first busbar layer and a second busbar layer stacked and connected. The first busbar layer connects at least two battery cells arranged along the first direction. The second busbar connects at least two battery cells arranged along the first direction. The thickness of the second busbar is greater than the thickness of the first busbar layer. The first busbar includes a first main body, a first connecting part, and a second main body. The first connecting part is located between the first main body and the second main body and is connected to the first main body and the second main body. The first main body and the second main body are arranged along the first direction and connected to different battery cells.

2. The battery according to claim 1, wherein, At least two of the battery cells at the end of the battery cell group along the first direction are connected to the first busbar.

3. The battery according to claim 1 or 2, wherein, The plurality of buses includes two first buses and at least one second bus, wherein in the first direction, the second bus is located between the two first buses.

4. The battery according to any one of claims 1-3, wherein, The first busbar includes two second busbars, which are located on the same side of the first busbar away from the battery cell, and are spaced apart along a second direction. The second direction, the first direction, and the stacking direction of the first busbar and the second busbar are perpendicular to each other.

5. The battery according to any one of claims 1-4, wherein, The portion of the first busbar that is not stacked with the second busbar is connected to the battery cell.

6. The battery according to any one of claims 1-5, wherein, The first busbar further includes a bend, the bend being connected to the first bus layer and The second busbar.

7. The battery according to claim 6, wherein, The bent portion is not directly connected to the first connecting portion.

8. The battery according to claim 7, wherein, The first connecting portion protrudes at least partially relative to the first body portion and the second body portion in the direction toward the battery cell; The first busbar layer has a recess, which corresponds to the position of the first connecting portion, and the recess is recessed relative to the surface of the first main body that is away from the battery cell.

9. The battery according to claim 7 or 8, wherein, The second busbar includes a first stacked portion, a second connecting portion, and a second stacked portion. The first stacked portion is stacked with the first main body portion and connected through the bending portion. The second stacked portion is stacked with the second main body portion and connected through the bending portion. The second connecting portion is connected to the first stacked portion and the second stacked portion. In the stacking direction of the first busbar and the second busbar, the second connecting portion and the first connecting portion at least partially overlap.

10. The battery according to any one of claims 6-9, wherein, The first busbar, the bent portion, and the second busbar are integrally formed.

11. The battery according to any one of claims 1 to 10, wherein, The thickness of the second busbar is equal to the sum of the thickness of the first busbar layer and the thickness of the second busbar layer.

12. An electrical device comprising a plurality of batteries according to any one of claims 1 to 11, the batteries being used to provide electrical energy.

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