Busbar and battery pack

Abstract

The utility model provides a busbar and a battery pack, the busbar is provided with a first connecting end and a second connecting end which are oppositely arranged, the first connecting end is used for being electrically connected with a first output end of a battery module, and the second connecting end is used for being electrically connected with a circuit breaking unit; and / or the first connecting end is used for being electrically connected with the second output end of the battery module, and the second connecting end is used for being electrically connected with the circuit breaking unit; wherein at least the first connecting end is made of aluminum, and the polarity of the first output end of the battery module is opposite to that of the second output end of the battery module. By applying the technical scheme provided by the utility model, the technical problem that the busbar and the battery cell module are inconvenient to connect in the prior art can be improved.

Description

Technical Field

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

[0002] In the related art, a bus bar is required for electrical connection between a battery module and a BDU (Battery Disconnect Unit) in a battery pack. Commonly used bus bars include hard copper bars, soft copper bars, or composite copper bars with hard and soft lap joints. This design has the following defects: 1. The bus bar is entirely made of copper material, so the production cost of the bus bar is relatively high; 2. The electrode posts of the battery cells in the battery module are usually supported by aluminum materials, and the bus bar cannot be directly welded to the aluminum posts. Therefore, the above design is not conducive to the connection between the battery module and the bus bar, and at the same time increases the production cost of the battery pack. Summary of the Utility Model

[0003] An embodiment of the utility model provides a bus bar and a battery pack, which can improve the technical problem that the bus bar and the battery cell module are not convenient to connect in the related art.

[0004] In a first aspect, an embodiment of the utility model provides a bus bar, which has a first connection end and a second connection end arranged oppositely. The first connection end is used for electrically connecting with a first output end of a battery module, and the second connection end is used for electrically connecting with a disconnect unit; and / or the first connection end is used for electrically connecting with a second output end of the battery module, and the second connection end is used for electrically connecting with the disconnect unit; wherein, at least the material of the first connection end includes aluminum, and the polarities of the first output end and the second output end of the battery module are opposite.

[0005] In an embodiment, the thickness of the bus bar is H1, and 0.5 mm ≤ H1 ≤ 0.8 mm.

[0006] In an embodiment, the bus bar includes: a body having a first connection end; and a lapping piece having a second connection end and a lapping end, and the lapping end is electrically connected to the body; wherein, the thickness of the lapping piece is greater than the thickness of the body.

[0007] In an embodiment, the thickness of the body is H2, and the thickness of the lapping piece is H3, 0.5 mm ≤ H2 ≤ 0.8 mm, and 3 mm ≤ H3 ≤ 5 mm.

[0008] In an embodiment, glue injection holes are arranged on the body, and the glue injection holes are correspondingly arranged with the gaps in the battery module.

[0009] In one embodiment, the body includes a first connection row and a second connection row connected in sequence. The first connection row has a first connection end. One end of the second connection row is in lap joint cooperation with the first connection row, and the other end of the second connection row is in lap joint cooperation with the lap joint end of the lap joint member. The first connection row includes an aluminum row, and the second connection row includes a copper row.

[0010] In one embodiment, the surface of the lap joint member has a silver plating layer.

[0011] In one embodiment, the lap joint member includes a flexible copper row.

[0012] In one embodiment, the thickness of the silver plating layer is H4, and 3μm ≤ H4 ≤ 8μm.

[0013] In one embodiment, the bus bar is further provided with a positioning hole and an avoidance portion. The bus bar is fixedly connected to other components through the positioning hole, and the avoidance portion is used to leave an installation space for the components below the bus bar.

[0014] In one embodiment, the bus bar further includes an insulating member, and the insulating member is provided at least at the edge of the body.

[0015] In a second aspect, an embodiment of the present invention provides a battery pack, which includes: the above-mentioned bus bar; a battery module, the first output end of the battery module is connected to the first connection end of the bus bar; a breaking unit, which is electrically connected to the second connection end of the bus bar.

[0016] Applying the technical solution of the present invention, the material of the first connection end is set as aluminum. Since the mining and processing technologies of aluminum materials are relatively mature, the use cost of aluminum materials is lower than that of copper materials, which can reduce the production cost of the bus bar. At the same time, the first output end and the second output end of the battery module are usually made of aluminum materials, which is convenient for the connection between the bus bar and the battery module and improves the installation efficiency between the bus bar and the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 is a three-dimensional schematic diagram of the bus bar provided by the embodiment of the present invention;

[0019] Figure 2 is a top view schematic diagram of the bus bar provided by the embodiment of the present invention;

[0020] Figure 3It is a side view schematic diagram of a busbar provided by an embodiment of the present utility model;

[0021] Figure 4 It is Figure 3 an enlarged schematic diagram of part A in

[0022] Figure 5 It is a partial structural schematic diagram of a battery pack provided by an embodiment of the present utility model.

[0023] Among them, the above-mentioned drawings include the following reference numerals:

[0024] 10. Busbar; 11. First connection end; 12. Second connection end;

[0025] 20. Body; 21. Glue injection hole; 22. First connection row; 23. Second connection row; 24. Avoidance part; 25. Positioning hole;

[0026] 30. Lapping part;

[0027] 40. Battery module;

[0028] 50. Disconnection unit. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

[0030] As Figures 1 to 4 shown, in the first aspect, an embodiment of the present utility model provides a busbar 10. The busbar 10 has a first connection end 11 and a second connection end 12 arranged oppositely. The first connection end 11 is used for electrically connecting with the first output end of the battery module 40, and the second connection end 12 is used for electrically connecting with the disconnection unit 50; and / or the first connection end 11 is used for electrically connecting with the second output end of the battery module 40, and the second connection end 12 is used for electrically connecting with the disconnection unit 50; wherein, at least the material of the first connection end 11 includes aluminum, and the polarities of the first output end and the second output end of the battery module 40 are opposite.

[0031] Applying the technical solution of the present utility model, the material of the first connection end 11 is set as aluminum. Since the mining and processing technologies of aluminum materials are relatively mature, the use cost of aluminum materials is lower than that of copper materials, which can reduce the production cost of the busbar 10. At the same time, the first output end and the second output end of the battery module 40 are usually made of aluminum materials, which is convenient for the connection between the busbar 10 and the battery module 40 and improves the installation efficiency between the busbar 10 and the battery module 40.

[0032] In this application, the battery module 40 includes a plurality of battery cells arranged in an array and connected to each other. It should be understood that the connection of the plurality of battery cells in the battery module 40 means that the battery cells are connected in series and / or in parallel. It should be noted that the first output end and the second output end refer to the two total output ends of the battery module 40 for external connection.

[0033] It should be understood that the polarities of the first output end and the second output end are opposite. When the first output end is of positive polarity, the second output end is of negative polarity. Conversely, when the first output end is of negative polarity, the second output end is of positive polarity. Specific limitations are not made here.

[0034] Specifically, the thickness of the busbar 10 is H1, and 0.5 mm ≤ H1 ≤ 0.8 mm. When H1 > 0.8 mm, the thickness of the busbar 10 is too large. Due to the limited space inside the battery pack, the distance between the battery module 40 and the upper cover of the battery pack is small, which cannot ensure that the busbar 10 can be arranged between the battery cell module and the upper cover of the battery pack. At the same time, the too large thickness of the busbar 10 will also increase the materials required during processing, thus increasing the production cost of the busbar 10 and being unfavorable for the mass production of the busbar 10. When H1 < 0.5 mm, the thickness of the busbar 10 is too small, which will make the cross-sectional area of the busbar 10 small, resulting in a decrease in the current-carrying capacity of the busbar 10. In this way, during the use of the busbar 10, the stability during the use of the busbar 10 will be reduced. In extreme cases, the busbar 10 may malfunction, thus affecting the normal use of the battery pack. Therefore, setting 0.5 mm ≤ H1 ≤ 0.8 mm can not only ensure that the busbar 10 is arranged between the battery cell module and the upper cover of the battery pack, reduce the materials required for the processing of the busbar 10, reduce the production cost of the busbar 10, and be beneficial to the mass production of the busbar 10, but also ensure that the busbar 10 has a certain current-carrying capacity and ensure its stability during use. Optionally, H1 can be set to values such as 0.5 mm, 0.7 mm, or 0.8 mm. The specific setting should be selected according to the use environment of the busbar 10, and specific limitations are not made here.

[0035] Further, the bus bar 10 includes: a body 20 having a first connection end 11; a lapping member 30 having a second connection end 12 and a lapping end, the lapping end being electrically connected to the body 20; wherein, the thickness of the lapping member 30 is greater than the thickness of the body 20. With such a setting, since the lapping member 30 needs to be electrically connected to the open circuit unit 50, in an environment of using large current, the lapping member 30 can have a higher current-carrying capacity, so as to meet the use requirements of the bus bar 10 under large current, and thus the applicability and application range of the bus bar 10 can be improved.

[0036] In this application, the lapping member 30 is specifically a flexible copper bus bar. Using a flexible copper bus bar can facilitate the flexible connection design at the connection with the body 20. At the same time, the flexible copper bus bar can be bent according to different use scenarios to adapt to various complex spatial layout requirements. This flexibility makes the flexible copper bus bar more convenient in the installation and wiring process, especially in equipment or structures that need to adapt to different shapes and angles, so as to optimize the space utilization in the battery pack and improve the energy density of the battery pack.

[0037] The material of the body 20 can be made of aluminum, which can further reduce the production cost of the bus bar 10, and thus is beneficial to realizing the mass production of the bus bar 10.

[0038] Specifically, the thickness of the body 20 is H2, and the thickness of the lapping member 30 is H3, where 0.5 mm ≤ H2 ≤ 0.8 mm and 3 mm ≤ H3 ≤ 5 mm.

[0039] When H2 > 0.8 mm, the thickness of the body 20 is too large. Due to the limited space inside the battery pack, the distance between the battery module 40 and the battery pack upper cover is small, so that it cannot be ensured that the body 20 can be arranged between the battery cell module and the upper cover of the battery pack. At the same time, the too large thickness of the body 20 will also increase the materials required during processing, thus increasing the production cost of the body 20, and thus being not conducive to the mass production of the body 20. When H2 < 0.5 mm, the thickness of the body 20 is too small, which will make the cross-sectional area of the body 20 smaller, resulting in a decrease in the current-carrying capacity of the body 20. In this way, during the use of the body 20, the stability during use of the body 20 will be reduced. In extreme cases, the body 20 may malfunction, thus affecting the normal use of the battery pack. Therefore, setting 0.5 mm ≤ H2 ≤ 0.8 mm can not only ensure that the body 20 is arranged between the battery cell module and the upper cover of the battery pack, reduce the materials required for processing the body 20, reduce the production cost of the body 20, and be beneficial to the mass production of the body 20, but also ensure that the body 20 has a certain current-carrying capacity and ensure its stability during use during the use of the body 20. Optionally, H2 can be set to values such as 0.5 mm, 0.7 mm or 0.8 mm, etc. The specific setting situation should be selected according to the use environment of the body 20, and no specific limitation is made here.

[0040] When H3 > 5 mm, the thickness of the overlapping part 30 is too large. Due to the limited space inside the battery pack, this will cause the overlapping part 30 to occupy too much space. At the same time, the large thickness of the overlapping part 30 will also increase the materials required during processing, thus increasing the production cost of the overlapping part 30, which is not conducive to the mass production of the overlapping part 30. When H3 < 3 mm, the thickness of the overlapping part 30 is too small, which will result in a smaller cross-sectional area of the overlapping part 30, leading to a decrease in the current-carrying capacity of the overlapping part 30. In this way, during the use of the overlapping part 30, the stability during use of the overlapping part 30 will be reduced. In extreme cases, the overlapping part 30 may malfunction, thus affecting the normal use of the battery pack. Therefore, setting 3 mm ≤ H3 ≤ 5 mm can not only ensure that the overlapping part 30 does not occupy too much space, but also reduce the materials required for processing the overlapping part 30, reduce the production cost of the overlapping part 30, which is conducive to the mass production of the overlapping part 30. At the same time, it can also ensure that the overlapping part 30 has a certain current-carrying capacity and ensure its stability during use. Optionally, H3 can be set to values such as 3 mm, 4 mm or 5 mm, etc. The specific setting should be selected according to the use environment of the overlapping part 30 and is not specifically limited here.

[0041] Furthermore, a glue injection hole 21 is provided on the body 20, and the glue injection hole 21 is correspondingly arranged with the gap inside the battery module 40. With this setting, after the bus bar 10 and the battery module 40 are installed, glue can be injected into the gap inside the battery module 40 through the glue injection hole 21, thereby improving the glue injection efficiency of the battery module 40. In this application, the cross-sectional shape of the glue injection hole 21 is square. Of course, in other embodiments of this application, the cross-section of the glue injection hole 21 can also be set to triangular or circular, etc. The specific setting should be selected according to the use environment of the bus bar 10 as long as it can meet the use requirements of the bus bar 10.

[0042] Specifically, the body 20 includes a first connection row 22 and a second connection row 23 connected in sequence. The first connection row 22 has a first connection end 11. One end of the second connection row 23 is lapped and fitted with the first connection row 22, and the other end of the second connection row 23 is lapped and fitted with the lapping end of the lapping member 30. The first connection row 22 includes an aluminum row, and the second connection row 23 includes a copper row. By setting the above structure, the body 20 is set to lap the aluminum row and the copper row. In this application, lapping means that the bottom surface of the end of the second connection row 23 close to the first connection row 22 is welded and fixed to the top surface of the end of the first connection row 22 close to the second connection row 23. At the same time, after the first connection row 22 and the second connection row 23 are lapped, the thickness of the lapping portion of the two is greater than the thickness of the first connection row 22 or the second connection row 23, but the thickness of the lapping portion is still within the thickness range of the body 20. This can not only meet the direct welding of the busbar 10 and the cell terminal, but also increase the current-carrying capacity of the body 20 to a certain extent, enabling the body 20 to work normally under large current, thereby improving the stability of the busbar 10 during operation.

[0043] In Figure 1 it, the parts within the dashed box are the first connection row 22 and the second connection row 23 respectively.

[0044] In this application, the first connection row 22 can be made of 1060-O state aluminum material. Using 1060-O state aluminum material can enable the first connection row 22 to be directly welded to the terminal of the cell, solve the problem that the copper row cannot be welded to the cell terminal, and at the same time realize the lapping with the soft copper connecting piece, improve the electrical conductivity and thermal conductivity, facilitate welding, and further improve the extensibility and tensile strength of the busbar 10.

[0045] Furthermore, the surface of the lapping member 30 has a silver plating layer. With this setting, since silver is a metal with high electrical conductivity, plating it on the surface of the lapping member 30 can significantly improve its electrical conductivity. This helps to reduce the transmission loss of current and improve the utilization efficiency of electric energy. At the same time, silver is more corrosion-resistant and oxidation-resistant than copper. After the surface of the lapping member 30 is silver-plated, the generation of oxidation and corrosion can be effectively prevented, the surface of the lapping member 30 can be kept clean and smooth, thereby extending its service life, and the silver plating layer can improve the surface finish and contact performance of the lapping member 30, reduce the contact resistance, enhance the stability and reliability of the circuit, so the service performance of the lapping member 30 can be improved.

[0046] Specifically, the thickness of the silver plating layer is H4, where 3μm ≤ H4 ≤ 8μm. When H4 > 8μm, the thickness of the silver plating layer is too large, which will increase the materials required for the processing of the silver plating layer, thus increasing the production cost of the bus bar 10 and being unfavorable for the mass production of the bus bar 10. When H4 < 3μm, the thickness of the silver plating layer is too small, and in this case, the internal resistance of the overlapping part 30 cannot be effectively reduced. Therefore, setting 3μm ≤ H4 ≤ 8μm can not only reduce the materials required for the processing of the overlapping part 30, lower the production cost of the overlapping part 30, be conducive to the mass production of the bus bar 10 layer, but also reduce the internal resistance of the overlapping part 30, ensuring its stability during use. Optionally, H4 can be set to values such as 3μm, 5μm, or 8μm, etc. The specific setting should be selected according to the usage environment of the overlapping part 30, and no specific limitation is made here.

[0047] Furthermore, the bus bar 10 further includes an insulating member, and the insulating member is provided at least at the edge of the main body 20. In this application, the insulating member is specifically a hot-pressing film, which has a simple structure and is easy to process. It can not only meet the insulation requirements of the bus bar 10 but also reduce the production cost of the bus bar 10.

[0048] In this application, the bus bar 10 is also provided with a positioning hole 25 and an avoidance portion 24. Through the positioning hole 25, it can be fixedly connected to other components to ensure the stability of the bus bar 10 during operation. The setting of the avoidance portion 24 can leave an installation space for the components below the bus bar 10, facilitating the improvement of the assembly efficiency between the components.

[0049] In this application, other components may include CCS (Cell Connection System) components.

[0050] As Figure 5 shown, in the second aspect, an embodiment of the present utility model provides a battery pack, which includes: the above-mentioned bus bar 10; a battery module 40, the first output end of the battery module 40 is connected to the first connection end 11 of the bus bar 10 through an electric core; a disconnection unit 50, which is electrically connected to the second connection end 12 of the bus bar 10.

[0051] Applying the technical solution of the present utility model, the material of the first connection end 11 is set to aluminum. Since the mining and processing technologies of aluminum materials are relatively mature, the usage cost of aluminum materials is lower than that of copper materials, which can reduce the production cost of the bus bar 10. At the same time, the first output end and the second output end of the battery module 40 are usually made of aluminum materials, which facilitates the connection between the bus bar 10 and the battery module 40 and improves the installation efficiency between the bus bar 10 and the battery module 40.

[0052] It should be noted that the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0054] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present invention; the orientation words "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0055] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations of the spatial relative descriptions used herein will be made accordingly.

[0056] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0057] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A busbar, characterized in that: The busbar has a first connection end and a second connection end which are arranged opposite to each other, wherein the first connection end is used to be electrically connected to the first output end of the battery module, and the second connection end is used to be electrically connected to the circuit breaker unit; and / or the first connection end is used to be electrically connected to the second output end of the battery module, and the second connection end is used to be electrically connected to the circuit breaker unit; Wherein, at least the material of the first connection end includes aluminum, and the polarity of the first output end of the battery module and the second output end of the battery module are opposite.

2. The busbar according to claim 1, characterized in that: The thickness of the busbar is H1, 0.5mm≤H1≤0.8mm.

3. The busbar according to claim 1, characterized in that: The busbar comprises: A body having the first connection end; A lap joint, comprising the second connection end and a lap joint end, wherein the lap joint end is electrically connected to the body; Wherein, the thickness of the connecting piece is greater than the thickness of the main body.

4. The busbar according to claim 3, characterized in that: The thickness of the main body is H2, the thickness of the lap joint is H3, 0.5mm≤H2≤0.8mm, 3mm≤H3≤5mm.

5. The busbar according to claim 3, characterized in that: The main body is provided with a glue injection hole, and the glue injection hole is arranged corresponding to the gap in the battery module.

6. The busbar according to claim 3, characterized in that: The main body includes a first connection row and a second connection row connected in sequence, the first connection row has the first connection end, one end of the second connection row is overlapped with the first connection row, and the other end of the second connection row is overlapped with the overlap end of the overlap member, the first connection row includes an aluminum row, and the second connection row includes a copper row.

7. The busbar according to any one of claims 3 to 6, characterized in that: The surface of the connecting piece is provided with a silver-plated layer.

8. The busbar according to any one of claims 3 to 6, characterized in that: The bridge piece includes a soft copper busbar.

9. The busbar according to claim 7, characterized in that: The thickness of the silver-plated layer is H4, 3 μm≤H4≤8 μm.

10. The busbar according to any one of claims 1 to 6, characterized in that: The busbar is also provided with a positioning hole and an avoidance portion, the busbar is fixedly connected to other components through the positioning hole, and the avoidance portion is used to leave installation space for the components below the busbar.

11. The busbar according to claim 3, characterized in that: The busbar further comprises an insulating member, and the insulating member is disposed at least at the edge of the body.

12. A battery pack, characterized in that: The battery pack comprises: The busbar according to any one of claims 1 to 11; A battery module, wherein a first output terminal of the battery module is connected to a first connection terminal cell of the bus; The circuit breaker unit is electrically connected to the second connection end of the bus.

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