Busbar and battery pack

Abstract

The utility model provides a busbar and a battery pack, and the busbar comprises a busbar body which comprises at least two layers of laminated sheets which are arranged in a folding manner, and every two adjacent layers of laminated sheets are connected through a bending part; and the at least one connecting part is arranged on one side of the confluence body along the width direction and is used for connecting a battery cell of a battery pack. The busbar and the battery pack are simple in structure and convenient to manufacture, the occupied space of the busbar can be effectively reduced, the space utilization rate of the battery pack is improved, and the energy density of the battery pack is ensured.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a bus bar and a battery pack. Background Art

[0002] With the wide application of new energy vehicles, there is a higher demand for the endurance of vehicles. The stored electricity of vehicle batteries needs to be further improved. A battery pack usually includes a plurality of battery cells connected by a bus bar. As the number of parallel-connected battery cells increases, the bus bar needs to have a larger current-carrying area, resulting in a relatively large occupied space of the bus bar, which is not conducive to the lightweight and compact development of the battery pack. Therefore, there is an urgent need for a bus bar with higher space utilization. Summary of the Utility Model

[0003] In view of this, the purpose of this application is to provide a bus bar and a battery pack to solve the related problems mentioned in the background art.

[0004] In the first aspect of this application, a bus bar is provided, including: a bus bar body, including at least two layers of laminations arranged in a folded manner, and adjacent two layers of the laminations are connected by a bending portion; at least one connecting portion, arranged on one side of the bus bar body along the width direction, for connecting the battery cells of the battery pack.

[0005] Further, the bus bar further includes at least one output portion, and the output portion is arranged on the other side of the bus bar body along the width direction.

[0006] Further, the output portion includes a mating section and an output section connected to each other. The mating section is arranged between adjacent two layers of laminations and is respectively in contact with these two layers of laminations, and the projection of the output section on the plane where the lamination is located is outside the lamination.

[0007] Further, the bending portion is provided with a plugging hole, and the mating section passes through the plugging hole and is in contact with the lamination.

[0008] Further, the bus bar body includes at least three layers of laminations, and adjacent two layers of laminations cooperate with one bending portion to form an opening, and the mating section is located between the adjacent two layers of laminations facing the output portion of the opening.

[0009] Further, the mating section and the lamination are connected by welding or bolt connection.

[0010] Further, weld seams or bolt holes are provided in the area of the lamination opposite to the mating section.

[0011] Further, there are a plurality of connecting portions, which are spaced and connected on the same side of the bus bar body and are integrally formed with the lamination.

[0012] Further, the battery cell is a cylindrical battery cell, and one end of the connecting portion away from the busbar body has a connecting surface, which is circular or arc-shaped and is used to abut against the battery cell.

[0013] In the second aspect of the present application, a battery pack is provided, which includes a box body. A plurality of battery cells and the busbar as described in the first aspect above are arranged in the box body, and the connecting portion of the busbar is connected to the battery cells.

[0014] Further, there are two groups of busbars. Among them, the connecting portion of one group of busbars is connected to the positive electrode of the battery cell, and the connecting portion of the other group of busbars is connected to the negative electrode of the battery cell.

[0015] As can be seen from the above, for the busbar and the battery pack provided in the present application, the busbar includes a busbar body and at least one connecting portion. The connecting portion is arranged on one side of the busbar body along the width direction and is used to connect the battery cells of the battery pack. The busbar body includes at least two layers of laminations arranged in a folded manner, and adjacent two layers of laminations are connected through a bending portion. Through the folding design of the busbar body, while ensuring a relatively large current-carrying area of the busbar body, the structure is made more compact, the projected area of the busbar body can be reduced, and the space utilization rate can be improved. The busbar and the battery pack have a simple structure and are convenient to manufacture, can effectively reduce the occupied space of the busbar, improve the space utilization rate of the battery pack, and ensure the energy density of the battery pack. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of the first busbar in the embodiment of the present application;

[0018] Figure 2 is Figure 1 a cross-sectional view of the busbar in the A-A direction;

[0019] Figure 3 It is a schematic structural diagram of the second busbar in the embodiment of the present application;

[0020] Figure 4 It is a schematic structural diagram of the third busbar in the embodiment of the present application;

[0021] Figure 5 is Figure 4 a cross-sectional view of the busbar in the B-B direction;

[0022] Figure 6 It is a schematic cross-sectional structure diagram of the fourth busbar in the embodiment of the present application;

[0023] Figure 7 It is a schematic partial structure diagram of a battery pack in the embodiment of the present application.

[0024] Reference numerals: 1. Busbar body; 1-1. Laminated sheet; 1-2. Bent portion; 1-3. Insertion hole; 2. Connection portion; 2-1. Connection surface; 3. Output portion; 3-1. Matching section; 3-2. Output section; 4. Battery cell; 5. Box body. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0026] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those of ordinary skill in the field to which the present application belongs. The "first", "second" and similar terms used in the embodiments of the present application do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0027] With the wide application of new energy vehicles, there is a higher demand for the endurance of vehicles, and the stored electricity of vehicle batteries needs to be further improved. A battery pack usually includes multiple battery cells connected by a busbar. As the number of parallel-connected battery cells increases, the busbar needs to have a larger current-carrying area, resulting in a larger occupied space for the busbar, which is not conducive to the development of lightweight and compact battery packs. Therefore, there is an urgent need for a busbar with higher space utilization.

[0028] In some technologies, additional busbar sheets are welded on the existing busbar to increase the current-carrying area, but the projected area of the overall structure is large and the occupied space is more. A folded busbar structure can be considered to increase the current-carrying area while ensuring a smaller projected area and improving space utilization.

[0029] The following further details the technical solutions of the present application through specific embodiments and in combination with the attached Figures 1 to 7 drawings.

[0030] In some embodiments of the present application, a bus bar is provided, including: a bus bar body 1, including at least two layers of laminations 1-1 arranged in a folded manner, and adjacent two layers of laminations 1-1 are connected by a bending portion 1-2; at least one connecting portion 2, arranged on one side of the bus bar body 1 along the width direction, for connecting the battery cells 4 of the battery pack.

[0031] As Figure 1 shown, it is a schematic structural diagram of a bus bar. The bus bar includes a bus bar body 1 and at least one connecting portion 2. Both the bus bar body 1 and the connecting portion 2 are made of conductive materials, and specific materials are not limited. In the figure, the W direction is the width direction of the bus bar body 1, and this width direction is the direction extending from the side where the lamination 1-1 is provided with the bending portion 1-2 to the opposite side. The connecting portion 2 is arranged on one side of the bus bar body 1 along the width direction, for connecting the battery cells 4 of the battery pack and can input current to the bus bar body 1.

[0032] The bus bar body 1 can collect the current of the battery cells 4 collected by the connecting portion 2. It includes at least two layers of laminations 1-1 arranged in a folded manner, and adjacent two layers of laminations 1-1 are connected by a bending portion 1-2. For example Figure 2 shown, it is Figure 1 the cross-sectional schematic diagram of the bus bar in the A-A direction in Figure 5 . The bus bar body 1 includes two layers of laminations 1-1, and the two layers of laminations 1-1 are connected by a bending portion 1-2; for example Figure 5 shown, it is the cross-sectional schematic diagram of another bus bar. The bus bar body 1 includes three layers of laminations 1-1. By setting the bus bar body 1 to include multiple layers of laminations 1-1, the current-carrying cross-sectional area of the bus bar body 1 can be increased to connect more battery cells 4. Because the multiple layers of laminations 1-1 are arranged in a folded manner, the structure is more compact. Compared with the design of increasing the current-carrying area by welding bus bars on the bus bar body 1, the projected area of the bus bar body 1 can be reduced, and the space utilization rate can be improved; and the folded bus bar body 1 is convenient to manufacture and can be realized by at least one stamping and bending process on the plate, with simple process and low cost.

[0033] This bus bar has a simple structure and is convenient to manufacture, can effectively reduce the occupied space of the bus bar, improve the space utilization rate of the battery pack, and ensure the energy density of the battery pack.

[0034] In some embodiments, the bus bar further includes at least one output portion 3, and the output portion 3 is arranged on the other side of the bus bar body 1 along the width direction.

[0035] As Figure 1As shown in the figure, the busbar further includes an output portion 3. The output portion 3 is made of a conductive material and is used to connect other busbars or electrical connectors, and can output the collected current. The output portion 3 is provided on the other side of the busbar body 1 in the width direction, opposite to the connection portion 2, which is convenient for layout. The number of output portions 3 is, for example, one or more. When multiple output portions 3 are provided on the busbar body 1, the heat dissipation area can be increased and the heat dissipation effect can be improved. The output portion 3 can be provided at any position on one side of the busbar body 1, such as Figure 1 as shown in the figure, its output portion 3 is provided in the middle of one side of the busbar body 1, such as Figure 7 as shown in the figure, which is a partial structural schematic diagram of a battery pack, and its output portion 3 is provided at one end of one side of the busbar body 1.

[0036] In some embodiments, the output portion 3 includes a mating section 3-1 and an output section 3-2 connected thereto. The mating section 3-1 is provided between two adjacent laminated sheets 1-1 and is respectively abutted against the two laminated sheets 1-1. The orthographic projection of the output section 3-2 on the plane where the laminated sheet 1-1 is located is located outside the laminated sheet 1-1.

[0037] such as Figure 1 as shown in the figure, the output portion 3 includes a mating section 3-1 and an output section 3-2 connected thereto. The provision of the output section 3-2 facilitates the connection to other busbars or electrical connectors, and the provision of the mating section 3-1 facilitates the connection to the busbar body 1. One output section 3-2 can be connected to one or more mating sections 3-1, and no specific limitation is made. The output section 3-2 is, for example, a block structure, and the mating section 3-1 is, for example, a block structure protruding from the output section 3-2, and no specific limitation is made.

[0038] such as Figure 2 as shown in the figure, the mating section 3-1 is provided between two laminated sheets 1-1 and is respectively abutted against the upper and lower laminated sheets 1-1. The mating section 3-1 realizes double-sided contact by being inserted into the busbar body 1. In this way, the contact area between the output portion 3 and the busbar body 1 is increased. On the basis of meeting the overcurrent performance, the overall size of the output portion 3 can be reduced, or the connection quantity of the output portion 3 can be reduced, thereby reducing the occupied area of the output portion 3. The orthographic projection of the output section 3-2 on the plane where the laminated sheet 1-1 is located is located outside the laminated sheet 1-1, which is convenient for electrical connection.

[0039] In some embodiments, the bending portion 1-2 is provided with an insertion hole 1-3, and the mating section 3-1 passes through the insertion hole 1-3 and abuts against the laminated sheet 1-1.

[0040] such as Figure 1As shown, the bent portion 1-2 is provided with a socket hole 1-3, which facilitates the fitting section 3-1 to pass through the socket hole 1-3 and abut against the laminated sheet 1-1. The number of socket holes 1-3 can be one or more. The socket holes 1-3 can be arranged in one-to-one correspondence with the output portions 3, or one output portion 3 corresponds to multiple socket holes 1-3, or multiple output portions 3 correspond to the same socket hole 1-3. There is no specific limitation.

[0041] In some embodiments, the busbar body 1 includes at least three laminated sheets 1-1. Adjacent two laminated sheets 1-1 cooperate with a bent portion 1-2 to form an opening. The fitting section 3-1 is located between the adjacent two laminated sheets 1-1 with the opening facing the output portion 3.

[0042] When setting two laminated sheets 1-1 in the busbar body 1 still does not meet the overcurrent requirement, more laminated sheets 1-1 can be set, such as Figure 4 As shown, it is a schematic structural diagram of a busbar. The busbar body 1 includes three laminated sheets 1-1, as Figure 6 As shown, it is a schematic cross-sectional structural diagram of another busbar. The busbar body 1 includes four laminated sheets 1-1, which can be achieved by bending the plate multiple times.

[0043] Any adjacent two laminated sheets 1-1 and the bent portion 1-2 connecting these two laminated sheets 1-1 can cooperate to form an opening. When the number of laminated sheets 1-1 of the busbar body 1 is greater than or equal to three, the busbar body 1 can form at least two openings, and at least one of the openings faces the output portion 3. At this time, there is no need to set socket holes 1-3 in the bent portion 1-2, such as Figure 4 As shown, the fitting section 3-1 can be directly placed between the adjacent two laminated sheets 1-1 with the opening facing the output portion 3 and abut against these two laminated sheets 1-1, eliminating the step of punching the socket holes 1-3, simplifying the process flow, and improving the component installation efficiency.

[0044] In some embodiments, the fitting section 3-1 and the laminated sheet 1-1 are connected by welding or bolts. Welding seams or bolt holes are provided in the area of the laminated sheet 1-1 opposite to the fitting section 3-1.

[0045] To ensure the fitting stability between the output portion 3 and the busbar body 1, the fitting section 3-1 and the laminated sheet 1-1 can be connected by welding or bolts, such as Figure 4 As shown, bolt holes are provided in the area of each laminated sheet 1-1 opposite to the fitting section 3-1, and coaxial bolt holes are also provided on the fitting section 3-1. The bolt holes can be through holes or screw holes to facilitate the bolts to pass through the bolt holes to connect the output portion 3 and the busbar body 1 and make the fitting section 3-1 and the laminated sheet 1-1 in close contact. The connection is convenient and also conducive to disassembly and replacement; such as Figure 3As shown in the figure, it is a schematic structural diagram of a busbar. Its mating section 3-1 is welded to the laminations 1-1 on both sides. Multiple weld seams can be arranged at intervals in the width direction or length direction within the area where the lamination 1-1 abuts against the mating section 3-1, ensuring close contact between the mating section 3-1 and the lamination 1-1, avoiding the space occupied by bolt connections in the thickness direction of the busbar, and improving the space utilization rate while enhancing the connection reliability.

[0046] In some embodiments, there are multiple connecting parts 2, which are connected at intervals on the same side of the busbar body 1 and are integrally formed with the lamination 1-1.

[0047] As Figure 1 shown, multiple connecting parts 2 are arranged at intervals on one side of the busbar body 1, which can be connected to multiple battery cells 4, eliminating the need for additional connection tabs, reducing the occupied area and manufacturing difficulty; as Figure 2 shown, the connecting part 2 and the lamination 1-1 are integrally formed, which is more convenient to manufacture compared to separately welding the connecting part 2 on the busbar body 1.

[0048] In some embodiments, the battery cell 4 is a cylindrical battery cell. One end of the connecting part 2 away from the busbar body 1 has a connecting surface 2-1, which is circular or arc-shaped and is used to abut against the battery cell 4.

[0049] As Figure 1 shown, one end of the connecting part 2 away from the busbar body 1 has a connecting surface 2-1, which is circular or arc-shaped, facilitating the connection of the electrodes of the cylindrical battery cell.

[0050] The cylindrical battery cell generally includes a casing, a wound core, and a positive electrode terminal. The wound core is disposed inside the casing. The positive electrode terminal is electrically connected to the positive electrode tab of the wound core, and the casing is electrically connected to the negative electrode tab of the wound core; axial end plates are provided at both ends of the casing. The positive electrode terminal passes through one axial end plate and exposes outside the casing; the shape of the positive electrode terminal is cylindrical, and the circular connecting surface 2-1 can be welded to the positive electrode terminal; the axial end plate is an annular plate, and the arc-shaped connecting surface 2-1 can be welded to the axial end plate.

[0051] In some embodiments of the present application, a battery pack is provided, which includes a box body 5. Multiple battery cells 4 and a busbar as described in any of the above embodiments are provided inside the box body 5, and the connecting part 2 of the busbar is connected to the battery cell 4.

[0052] As Figure 7 shown, it is a schematic structural diagram of a battery pack. The battery pack includes a box body 5. A busbar and multiple battery cells 4 are provided inside the box body 5. The connecting part 2 of the busbar is connected to the battery cell 4. This battery pack has a compact structure and a high energy density.

[0053] The battery pack can be applied to electrical equipment, which can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a planer, etc., which are not specifically limited.

[0054] In some embodiments, there are two sets of busbars. Among them, the connecting part 2 of one set of busbars is connected to the positive electrode of the battery cell 4, and the connecting part 2 of the other set of busbars is connected to the negative electrode of the battery cell 4.

[0055] There are two sets of busbars in the battery pack, and each set can include at least one busbar. As Figure 7 shown, two busbars are provided in the box body 5. One busbar is connected to the positive electrode of the battery cell 4, and the other busbar is connected to the negative electrode of the battery cell 4, and they cooperate with each other to output electric energy outward.

[0056] Those of ordinary skill in the art should understand that: the discussion of any above embodiment is only exemplary, and is not intended to imply that the scope of the present application (including the claims) is limited to these examples; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the embodiments of the present application as described above, and they are not provided in detail for the sake of brevity.

[0057] In addition, in the case of elaborating details to describe the exemplary embodiments of the present application, it is obvious to those skilled in the art that the present application embodiments can be implemented without these details or with changes to these details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0058] Although the present application has been described in combination with the embodiments of the present application, according to the foregoing description, many substitutions, modifications and variations of these embodiments will be obvious to those of ordinary skill in the art.

[0059] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent substitution, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included within the protection scope of the present application.

Claims

1. A busbar, characterized in that: include: The confluence body comprises at least two layers of laminated sheets folded in a folded manner, wherein two adjacent layers of the laminated sheets are connected via a bending portion; At least one connecting portion is disposed on one side of the busbar body along the width direction and is used to connect the battery cells of the battery pack.

2. The busbar according to claim 1, characterized in that: The device further comprises at least one output portion, wherein the output portion is arranged on the other side of the busbar body along the width direction.

3. The busbar according to claim 2, characterized in that: The output portion comprises a connected matching section and an output section, wherein the matching section is arranged between two adjacent laminated sheets and respectively abuts against the two laminated sheets, and the orthographic projection of the output section on the plane where the laminated sheets are located is located outside the laminated sheets.

4. The busbar according to claim 3, characterized in that: The bending portion is provided with an inserting hole, and the matching section passes through the inserting hole to abut against the laminate.

5. The busbar according to claim 3, characterized in that: The conduit body comprises at least three layers of the laminates, two adjacent layers of the laminates cooperate with one of the bent portions to form an opening, and the cooperation section is located between two adjacent layers of the laminates with the opening facing the output portion.

6. The busbar according to claim 3, characterized in that: The matching section is connected to the lamination by welding or bolts.

7. The busbar according to claim 6, characterized in that: A welding seam or a bolt hole is provided in a region of the lamination that is opposite to the matching section.

8. The busbar according to claim 1, characterized in that: The connecting parts are multiple and are connected at intervals on the same side of the conduit body and are integrally formed with the laminations.

9. The busbar according to claim 1, characterized in that: The battery core is a cylindrical battery core, and one end of the connecting portion away from the busbar body has a connecting surface, and the connecting surface is circular or arc-shaped and is used to abut against the battery core.

10. A battery pack, characterized in that: The invention comprises a box body, wherein a plurality of battery cells and a bus bar according to any one of claims 1 to 9 are arranged in the box body, and a connecting portion of the bus bar is connected to the battery cells.

11. The battery pack according to claim 10, characterized in that: The busbars are divided into two groups, wherein the connecting portion of one group of the busbars is connected to the positive electrode of the battery cell, and the connecting portion of the other group of the busbars is connected to the negative electrode of the battery cell.

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