A cylindrical battery busbar assembly and battery compartment

Abstract

The utility model relates to the technical field of battery busbar, concretely provides a cylindrical battery group busbar assembly, including a plurality of busbar units and a plurality of connecting pieces set between the busbar unit, and the connecting piece has conductivity, the busbar unit has multilayer structure, and the adjacent level adopts different conductive material quality, the utility model solves the problem that the current technology cylindrical battery busbar carries small and the expansibility is not strong.

Description

Technical Field

[0001] This utility model relates to the field of battery busbar technology, specifically providing a cylindrical battery pack busbar assembly. Background Technology

[0002] Cylindrical batteries have applications in numerous fields, especially in underwater vehicles where reliable power supply, strict waterproof sealing, and efficient space utilization are required. Due to the high density of cylindrical batteries, the current carrying capacity of the positive and negative busbars is critical. Traditional positive and negative busbars often use a single layer of nickel sheet, which has limited current carrying capacity, generates significant heat, and is detrimental to battery environmental safety. Furthermore, traditional positive and negative busbars are often made from a single piece of nickel or copper plate, resulting in complex manufacturing processes, high costs, and limited scalability for corresponding battery packs.

[0003] Therefore, it is of great significance to design a bus with a large current carrying capacity that can be expanded as the battery pack increases. Utility Model Content

[0004] This invention provides a cylindrical battery pack bus assembly that solves the problems of low current carrying capacity and poor expandability of existing cylindrical battery bus assemblies.

[0005] In a first aspect, this utility model provides a cylindrical battery pack bus assembly, including multiple bus units and multiple connectors disposed between the bus units, wherein the connectors are conductive; The bus unit has a multi-layer structure, and adjacent layers use different conductive materials.

[0006] According to the bus assembly provided by this utility model, the connector has an "arch"-shaped structure, with both ends embedded in adjacent bus units and electrically connected to the bus units.

[0007] According to the bus assembly provided by this utility model, the bus unit has multiple battery mounting holes, and an electrode spring is provided in the battery mounting hole. The electrode spring is obtained by extending and bending the bus unit. The edge of the battery mounting hole has a retaining ring; The center line connecting the three adjacent battery mounting holes forms an equilateral triangle.

[0008] According to the bus assembly provided by this utility model, the bus unit has an alternating structure of nickel and copper layers.

[0009] The bus assembly provided by this utility model further includes a heat dissipation layer, which has high thermal conductivity and insulation. The heat dissipation layer is disposed on the outermost side of the bus unit and is in contact with the bus unit.

[0010] According to the bus assembly provided by this utility model, the heat dissipation layer is made of nitride ceramic material.

[0011] According to the bus assembly provided by this utility model, the heat dissipation layer has a mesh-like perforated structure.

[0012] Secondly, this utility model also provides a battery compartment, including the busbar assembly as described above, and also including a surrounding plate. The surrounding plate is disposed between the positive and negative busbar assemblies that are arranged vertically and vertically, and the surrounding plate extends along the edge of the busbar assembly and forms a cylindrical battery pack installation space with the positive and negative busbar assemblies. The enclosure has a mesh-like perforated structure and is made of a highly thermally conductive insulating material.

[0013] The beneficial effects of this utility model are: This utility model provides a cylindrical battery pack bus assembly that significantly increases the total current carrying capacity and reduces heat generation by improving the traditional single-layer conductive bus into a multi-layer bus assembly. By designing the bus unit as a multi-layer structure and using different conductive materials for adjacent layers, the synergistic effect of the multi-layered heterogeneous materials can be achieved, simultaneously realizing multiple objectives such as "high current carrying efficiency, excellent thermal management, strong environmental adaptability, and lightweight / low cost." Materials and structures can be flexibly combined according to the needs of specific application scenarios (such as power systems, new energy equipment, and aerospace), greatly improving the overall performance and applicability of the bus unit.

[0014] By modifying the traditional busbar into a combination of multiple busbar units, the busbar can be expanded along with the cylindrical battery pack, thus enhancing its applicability; and by setting up connectors, multiple busbar units can be connected.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is one of the schematic diagrams of the three-dimensional structure of the busbar assembly provided by this utility model; Figure 2 This is a schematic diagram of the multi-layer structure of the bus unit provided by this utility model; Figure 3 This is a schematic diagram of the installation structure of the busbar unit and connectors provided by this utility model; Figure 4 This is a disassembled structural diagram of the busbar unit and connectors provided by this utility model; Figure 5 This is a schematic diagram of the battery mounting hole location and electrode spring structure provided by this utility model; Figure 6 This is a schematic diagram of the nickel and copper layer arrangement structure provided by this utility model; Figure 7 This is a three-dimensional structural diagram of the heat dissipation layer provided by this utility model; Figure 8 This is a three-dimensional structural diagram of the heat dissipation layer and busbar unit provided by this utility model; Figure 9 This is a three-dimensional structural diagram of the battery compartment provided by this utility model.

[0018] 1. Busbar unit; 101. Copper layer; 102. Nickel layer; 103. Battery mounting hole; 104. Retaining ring; 105. Electrode spring; 2. Connecting parts; 3. Heat dissipation layer; 4. Enclosure panels. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions 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, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] In the description of the embodiments of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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 the embodiments of this utility model. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0022] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0024] The following is combined with Figures 1 to 9 The embodiments shown illustrate the technical solution of this utility model: This utility model embodiment provides a cylindrical battery pack bus assembly, such as Figure 1 and Figure 2 As shown, it includes multiple busbar units 1 and multiple connectors 2 disposed between the busbar units 1, the connectors 2 being conductive; Bus unit 1 has a multi-layer structure, and adjacent layers use different conductive materials.

[0025] In some embodiments, the connector 2 can have various structural forms, such as "C" shape, "U" shape, or "bow" shape, etc. Only its two ends need to be embedded in the busbar unit 1 and welded to it. This ensures both the physical connection between adjacent busbar units 1 and the conductivity of the current. Its material can be copper, nickel, silver, etc. The busbar unit 1 consists of a multi-layer conductive structure, which can be a combination of copper and nickel, or a combination of copper and silver. Using different materials between adjacent layers can increase the current carrying capacity while significantly improving the overall performance and applicability of the busbar unit 1.

[0026] The cylindrical battery pack bus assembly provided in this embodiment of the invention significantly increases the total current carrying capacity and reduces heat generation by improving the traditional single-layer conductive bus into a multi-layer bus assembly. By setting the bus unit 1 as a multi-layer structure and using different conductive materials for adjacent layers, the synergistic effect of the multi-layer heterogeneous materials can be achieved, simultaneously realizing multiple objectives such as "high current carrying efficiency, excellent thermal management, strong environmental adaptability, and lightweight / low cost". The materials and structure can be flexibly combined according to the needs of specific application scenarios (such as power systems, new energy equipment, and aerospace), greatly improving the comprehensive performance and applicability of the bus unit 1.

[0027] By modifying the traditional busbar into a combination of multiple busbar units 1, the busbar can be expanded along with the cylindrical battery pack, thereby enhancing applicability; the connection of multiple busbar units 1 can be achieved through the setting of connector 2.

[0028] According to the bus assembly provided by this utility model, such as Figure 3 and Figure 4 As shown, connector 2 has a bow-shaped structure, with both ends embedded in adjacent busbar units 1 and electrically connected to busbar units 1.

[0029] In this embodiment, the connector 2 is preferably "bow" shaped. This design allows for a closer fit to the external structure of the adjacent busbar unit 1, resulting in a tight fit between the connector 2 and the busbar unit 1 and good flow performance. Compared to other structural shapes, it has a higher space utilization rate.

[0030] According to the bus assembly provided by this utility model, such as Figure 5 As shown, the bus unit 1 has multiple battery mounting holes 103, and an electrode spring 105 is provided in the battery mounting hole 103. The electrode spring 105 is obtained by extending and bending the bus unit 1. The edge of the battery mounting hole 103 has a retaining ring 104. The center line connecting three adjacent battery mounting holes 103 forms an equilateral triangle.

[0031] Multiple battery mounting holes 103 of the same size are formed on the busbar unit 1, and the center line connecting three adjacent battery mounting holes 103 forms an equilateral triangle. The length of the line connecting the centers of two adjacent battery mounting holes 103 can be greater than twice the inner diameter of the battery mounting hole 103. The specific amount of increase can be flexibly selected according to needs. In this embodiment, the length of the line connecting the centers of two adjacent battery mounting holes 103 is greater than twice the inner diameter of the battery mounting hole 103 by 5 mm. In this way, the planar area of ​​the busbar unit 1 can be fully utilized, and more cylindrical batteries can be loaded. The cylindrical batteries can be fixed by the setting of the retaining ring 104 to prevent them from shifting under vibration.

[0032] According to the bus assembly provided by this utility model, such as Figure 6 As shown, bus unit 1 has an alternating structure of nickel layer 102 and copper layer 101.

[0033] In this embodiment, the bus unit 1 adopts a three-layer structure, with the upper and lower outer layers being nickel layers 102 and the middle layer being copper layers 101.

[0034] The intermediate copper layer 101 is the core conductive layer; the resistivity of copper is approximately 1.72 × 10⁻ ... 8 With a Ω·m value far lower than nickel, it possesses excellent conductivity and high current carrying capacity, minimizing Joule heat loss during current transmission and making it suitable for high-current applications.

[0035] Nickel has better resistance to electromigration than pure copper. The outer nickel layer 102 can prevent copper atoms from migrating and diffusing to the surface or connection parts under long-term high current, avoiding failure problems such as local conductor thinning and breakage. At the same time, nickel has a higher surface hardness than copper, which can reduce wear during insertion and removal and contact, maintain stable contact resistance, and improve the long-term electrical reliability of the bus.

[0036] According to the bus assembly provided by this utility model, such as Figure 7 and Figure 8 As shown, it also includes a heat dissipation layer 3, which has high thermal conductivity and insulation. The heat dissipation layer 3 is located on the outermost side of the bus unit 1 and is in contact with the bus unit 1.

[0037] In some embodiments, materials with high thermal conductivity and insulation include nitride ceramics and oxide ceramics. Typical examples of nitride ceramics are aluminum nitride (AlN) and silicon nitride (Si3N4); typical examples of oxide ceramics are beryllium oxide (BeO) and highly thermally conductive alumina (Al2O3).

[0038] Only with high thermal conductivity and insulation can it be closely fitted to busbar unit 1 to achieve efficient heat dissipation.

[0039] According to the bus assembly provided by this utility model, such as Figure 7 and Figure 8 As shown, the heat dissipation layer 3 is made of nitride ceramic material.

[0040] In this embodiment, the heat dissipation layer 3 is preferably a nitride ceramic material, such as aluminum nitride (AlN) or silicon nitride (Si3N4). Among them, aluminum nitride (AlN) has a thermal conductivity of 150-320 W / (m·K) (approaching that of some metals) and excellent insulation performance (volume resistivity > 10¹). 4 (Ω・m), high coefficient of thermal expansion matching silicon chip, and good chemical stability.

[0041] Silicon nitride (Si3N4) has a thermal conductivity of approximately 80-120 W / (m・K), higher fracture toughness than AlN, and better thermal shock resistance and wear resistance, making it suitable for harsh high-temperature environments.

[0042] According to the bus assembly provided by this utility model, such as Figure 7 and Figure 8 As shown, heat dissipation layer 3 has a mesh-like perforated structure.

[0043] In this embodiment, the heat dissipation layer 3 is configured as a regularly arranged diamond-shaped mesh structure, which can further accelerate the heat dissipation inside the battery compartment, and also facilitate the lightweighting and low cost of the heat dissipation layer 3.

[0044] This utility model also provides a battery compartment, such as Figure 9 As shown, the battery pack includes the busbar assembly as described above, and also includes a surrounding plate 4. The surrounding plate 4 is disposed between the positive and negative busbar assemblies that are disposed vertically and vertically, and the surrounding plate 4 extends along the edge of the busbar assembly and forms a cylindrical battery pack installation space with the positive and negative busbar assemblies. The enclosure 4 has a mesh-like perforated structure and is made of a highly thermally conductive insulating material.

[0045] In this embodiment, the positive and negative busbar assemblies are arranged facing each other vertically, and the two are enclosed by a partition plate 4 to form a battery compartment. The positive and negative busbar assemblies are respectively bolted or welded to the partition plate 4, and the partition plate 4 and the heat dissipation layer 3 are made of the same material, such as silicon nitride (Si3N4), and both have a mesh structure. In this way, heat dissipation can be provided for the battery pack, and installation space can be provided for the battery pack.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cylindrical battery pack bus assembly, characterized in that, It includes multiple busbar units and multiple connectors disposed between the busbar units, the connectors being conductive; The bus unit has a multi-layer structure, and adjacent layers use different conductive materials.

2. The bus assembly according to claim 1, characterized in that, The connector has an "arch"-shaped structure, with its two ends embedded in adjacent busbar units and electrically connected to the busbar units.

3. The bus assembly according to claim 1, characterized in that, The bus unit has multiple battery mounting holes, and electrode springs are provided in the battery mounting holes. The electrode springs are obtained by extending and bending the bus unit. The edge of the battery mounting hole has a retaining ring; The center line connecting the three adjacent battery mounting holes forms an equilateral triangle.

4. The bus assembly according to claim 1, characterized in that, The bus unit has an alternating structure of nickel and copper layers.

5. The bus assembly according to claim 1, characterized in that, It also includes a heat dissipation layer, which has high thermal conductivity and insulation. The heat dissipation layer is disposed on the outermost side of the bus unit and is in contact with the bus unit.

6. The bus assembly according to claim 5, characterized in that, The heat dissipation layer is made of nitride ceramic material.

7. The bus assembly according to claim 5, characterized in that, The heat dissipation layer has a mesh-like perforated structure.

8. A battery compartment, comprising a busbar assembly as described in any one of claims 1-7, and further comprising a partition, the partition being disposed between positive and negative busbar assemblies disposed vertically and vertically, and the partition extending along the edge of the busbar assembly and forming a cylindrical battery pack mounting space with the positive and negative busbar assemblies. The enclosure has a mesh-like perforated structure and is made of a highly thermally conductive insulating material.

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