Busbar, integrated busbar, battery pack and vehicle
By designing a multi-layer busbar, utilizing a second conductive layer with lower resistivity and laser welding technology, the problems of slow battery charging speed and temperature rise were solved, achieving fast charging and improved safety.
Patent Information
- Application Number
- CN202422975677.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-03
AI Technical Summary
Existing batteries have a slow charging speed, which makes it difficult to meet the demand for fast charging. Furthermore, the bus temperature rises during high-current charging, posing a safety hazard.
Design a multi-layer busbar including a conductive section and a connecting section. The conductive section consists of a first conductive layer and a second conductive layer with lower resistivity. The connecting section is an integral structure with the conductive section and is connected to the electrode post by laser welding to reduce the overall resistivity and improve the charging speed.
By reducing the resistivity of the bus, the charging speed is improved, the current carrying capacity of the bus is enhanced, and the increased resistance caused by the small thickness of the connection part is avoided, thus ensuring safety.
Smart Images
Figure CN223693309U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of batteries, in particular to a busbar, an integrated busbar, a battery pack and a vehicle. BACKGROUND
[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric cars, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy ships, electric toy aircraft and electric tools. However, the charging speed of existing batteries still needs to be improved. SUMMARY
[0003] The present disclosure provides a busbar, an integrated busbar, a battery pack and a vehicle, which can improve the charging speed.
[0004] According to an aspect of the present disclosure, a busbar is provided, comprising a conducting portion and a plurality of connecting portions, each of the connecting portions being electrically connected to the conducting portion; the thickness of the conducting portion is greater than the thickness of the connecting portions, and the conducting portion comprises a first conductive layer and at least one second conductive layer covering the first conductive layer, the first conductive layer and the connecting portions are in an integral structure, and the second conductive layer is electrically connected to the first conductive layer; the resistivity of the second conductive layer is less than that of the first conductive layer.
[0005] In an exemplary embodiment of the present disclosure, the ratio of the thickness of the second conductive layer to the first conductive layer is 1:2.5 to 1:3.5.
[0006] In an exemplary embodiment of the present disclosure, the first conductive layer and the second conductive layer are matched and fitted, the material of the second conductive layer is copper, and the materials of the first conductive layer and the connecting portions are aluminum.
[0007] In an exemplary embodiment of the present disclosure, the conducting portion further comprises an adapter layer, the adapter layer covers the first conductive layer and is matched and fitted with the first conductive layer, and the second conductive layer covers the adapter layer and is matched and fitted with the adapter layer; the first conductive layer and the second conductive layer are electrically connected through the adapter layer.
[0008] In an exemplary embodiment of the present disclosure, the material of the adapter layer is copper-aluminum alloy.
[0009] In an exemplary embodiment of the present disclosure, the connecting portion has a groove, and the bottom of the groove is provided with a positioning hole.
[0010] In an exemplary embodiment of the present disclosure, the connecting portion is provided with a positioning hole.
[0011] According to an aspect of the present disclosure, an integrated busbar is provided, comprising a plurality of busbars according to any one of the above.
[0012] In an exemplary embodiment of the present disclosure, the integrated busbar further comprises:
[0013] a first insulating support disposed on one side of the busbar and connected with the conducting part;
[0014] a second insulating support comprising a support part and a separation part connected with the support part; the separation part is separated between two adjacent busbars, the support part is disposed on one side of the busbar and connected with the connecting part.
[0015] According to an aspect of the present disclosure, a battery pack is provided, comprising a plurality of battery monomers and a plurality of integrated busbars as described above; the battery monomer comprises a shell and a pole column disposed at one end of the shell; part of the pole columns of two adjacent battery monomers are electrically connected through the busbar.
[0016] According to an aspect of the present disclosure, a vehicle is provided, comprising the battery pack as described above.
[0017] The busbar, integrated busbar, battery pack and vehicle of the present disclosure can realize the connection of the battery monomers through the busbar, so as to realize the series connection and parallel connection of the battery monomers; the integrated busbar can integrate a plurality of busbars in one whole, improving the installation efficiency. Meanwhile, since the thickness of the connecting part is smaller than that of the conducting part, it is beneficial to weld the connecting part with the pole column of the battery monomer; the resistivity of the second conductive layer of the conducting part is smaller than that of the first conductive layer, which can reduce the resistivity of the conducting part, and accordingly, can compensate the increased resistance caused by the small thickness of the connecting part, so as to reduce the resistivity of the whole busbar and improve the overcurrent capacity of the busbar, which is beneficial to improve the charging speed.
[0018] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS
[0019] The drawings incorporated into the specification and forming part of the specification, show embodiments consistent with the present disclosure, and together with the specification, serve to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.
[0020] Figure 1 Assembly view of an embodiment of the battery pack of the present disclosure.
[0021] Figure 2 A-A sectional view of Figure 1
[0022] Figure 3 is a close-up view of part B of Figure 2
[0023] Figure 4 is a close-up view of part B of Figure 1 is a schematic view of part of the structure of the battery pack.
[0024] Figure 5 is a schematic view of an embodiment of the busbar of the present disclosure.
[0025] Figure 6 is a top view of an embodiment of the busbar of the present disclosure.
[0026] Figure 7 is a close-up view of part B of Figure 6 is a C-C sectional view of
[0027] BRIEF DESCRIPTION OF DRAWINGS
[0028] 1. battery monomer; 11, outer shell; 12, battery cell; 13, pole;
[0029] 2. busbar; 21, connecting part; 22, conducting part; 221, first conductive layer; 222, second conductive layer; 23, groove; 231, positioning hole; 24, limiting hole;
[0030] 3. integrated busbar; 31, first insulating support; 32, second insulating support; 321, support part; 322, separation part;
[0031] 4. tray; 5, cover plate; 6, box. DETAILED DESCRIPTION
[0032] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the specification. Additionally, the drawings are merely schematic and viewed from different angles as a result, the illustration of an object can vary depending on the direction of viewing.
[0033] The terms "one", "a", "an", "the", and "at least one" are used to mean that "one or more" of something is present; the term "or" is used to mean "and / or" both; the term "has" is used to mean "one or more of the listed terms can be present" and allows for the presence of zero, one, or more of a term. The term "first", "second", "third", etc. are used to denote names of various components and do not imply a limitation on the number of components. The term "plurality" is used to mean "two or more".
[0034] As Figures 1-3 As shown, the busbar can be used to realize series or parallel connection of battery monomers. The battery monomer 1 can include a shell 11, an electric core 12 arranged in the shell 11, and a pole 13 arranged at one end of the shell 11, and the pole 13 is connected with the electric core 12. The pole 13 can include a positive pole and a negative pole. Adjacent battery monomers 1 can be connected through the busbar 2, that is, one pole 13 of one battery monomer 1 is connected with one pole 13 of another battery monomer 1, and series or parallel connection of multiple battery monomers 1 can be realized through multiple busbars 2.
[0035] With the increasing requirement for battery charging time, the charging time needs to be shorter and the discharge power needs to be larger, which makes the current passing through the loop larger, resulting in the temperature of the busbar rising. In order to avoid the temperature being too high, the cross section of the busbar can be increased, but the space in the battery pack is limited, the cross section size cannot be increased indefinitely, and is limited by the welding process. In order to ensure normal welding of the busbar and the pole, the cross section of the busbar should not be too large.
[0036] In order to improve the conductivity and increase the charging speed under the premise of ensuring normal welding, the inventor proposes a new busbar 2, as shown in Figures 3-7 As shown, the busbar 2 can include a conducting part 22 and multiple connecting parts 21, each connecting part 21 is electrically connected with the conducting part 22; the thickness of the connecting part 21 is smaller than the thickness of the conducting part 22, and the conducting part 22 includes a first conductive layer 221 and at least one second conductive layer 222 wrapped outside the first conductive layer 221, the first conductive layer 221 and the connecting part 21 are in one body structure, and the second conductive layer 222 is electrically connected with the first conductive layer 221; the resistivity of the second conductive layer 222 is smaller than that of the first conductive layer 221.
[0037] The busbar 2 of the embodiment of the present disclosure can weld one connecting part 21 with one pole 13, and the conducting part 22 can connect each connecting part 21, thereby realizing series or parallel connection of battery monomers 1. Since the thickness of the connecting part 21 is smaller than the thickness of the conducting part 22, it is beneficial to weld the connecting part 21 with the pole 13 by a process such as laser welding. At the same time, the conducting part 22 can be a multi-layer structure, the first conductive layer 221 and the connecting part 21 are in one body structure, and the resistivity of the second conductive layer 222 is smaller than that of the first conductive layer 221. Compared with simply thickening the first conductive layer 221, the resistivity of the whole conducting part 22 can be reduced through the second conductive layer 222, and accordingly, the resistivity of the busbar 2 can be reduced, which makes up for the increase in resistance caused by the smaller thickness of the connecting part 21, thereby reducing the overall resistivity of the busbar 2 and improving the overcurrent capacity of the busbar 2, which is beneficial to improve the charging speed.
[0038] The busbar 2 will be described in detail as follows:
[0039] As shown in Figures 5-7As shown, in some embodiments of this disclosure, the first conductive layer 221 of the connecting portion 21 and the conductive portion 22 can be different regions of the same plate-like structure, and both have the same material and thickness; for example, there are two connecting portions 21, which are connected to both ends of the first conductive layer 221, thus allowing two battery cells 1 to be connected. Of course, in other embodiments of this disclosure, there can be three or more connecting portions 21, which can be distributed around the conductive portion 22, thereby allowing three or more battery cells 1 to be connected.
[0040] The second conductive layer 222 covers the outside of the first conductive layer 221. If there is only one second conductive layer 222, it can be matched and adhered to the surface of the first conductive layer 221 and surround the first conductive layer 221. If there are multiple second conductive layers 222, each second conductive layer 222 covers the outside of the first conductive layer 221 from the inside to the outside, with only the innermost second conductive layer 222 matching and adhering to the first conductive layer 221.
[0041] The resistivity of the second conductive layer 222 is less than that of the first conductive layer 221. Compared with simply thickening the first conductive layer 221, the overall resistivity of the conductive part 22 can be reduced by the second conductive layer 222.
[0042] In some embodiments of this disclosure, the material of the first conductive layer 221 may be aluminum, such as 1-series O-state pure aluminum, and the material of the second conductive layer 222 may be copper, such as T2 copper. The second conductive layer 222 may also be made of other conductive materials with a resistivity lower than that of aluminum.
[0043] like Figure 7 As shown, in order to ensure conductivity while avoiding excessive overall thickness of the conductive part 22, the thickness ratio of the second conductive layer 222 to the first conductive layer 221 can be 1:2.5 to 1:3.5. For example, a thickness ratio of 1:3 for the second conductive layer 222 to the first conductive layer 221 can reduce resistivity, improve conductivity, and save space to prevent interference with other structures.
[0044] To reduce the contact resistance between the second conductive layer 222 and the first conductive layer 221 and to make them bond more tightly, the material of the second conductive layer 222 can be heated to a molten state and coated onto the outside of the first conductive layer 221 and the connecting portion 21. After cooling, the second conductive layer 222 outside the connecting portion 21 can be removed by laser cutting or other processes, leaving only the second electrode layer outside the first conductive layer 221. The material of the molten second conductive layer 222 and the material of the first conductive layer 221 can bond within a certain range to form an alloy.
[0045] In some embodiments of the present disclosure, the conducting portion 22 can further comprise an adapter layer, which can be coated outside the first conductive layer 221 and match with the first conductive layer 221, and the second conductive layer 222 can be coated outside the adapter layer and match with the adapter layer. The first conductive layer 221 and the second conductive layer 222 are electrically connected through the adapter layer. The resistivity of the adapter layer is less than that of the first conductive layer 221 and greater than that of the second conductive layer 222. For example, the material of the first conductive layer 221 is aluminum, the material of the second conductive layer 222 is copper, and the material of the adapter layer can be a copper-aluminum alloy.
[0046] Of course, in other embodiments of the present disclosure, the second conductive layer 222 can be coated outside the first conductive layer 221 through hot pressing or other processes, and the two are closely matched.
[0047] As shown in Figure 5 and Figure 6 In some embodiments of the present disclosure, the connecting portion 21 can be provided with a groove 23, the depth of the groove 23 is less than the thickness of the connecting portion 21, that is, the connecting portion 21 can be partially thinned through the groove 23. When the pole 13 is welded, the pole 13 is opposite to the groove 23 and located at the back side of the groove 23, and the thinned area is beneficial to welding through laser welding or other methods. At the same time, a positioning hole 231 can be provided at the bottom of the groove 23, and the pole 13 can be partially inserted into the positioning hole 231 to achieve positioning. The profile of the groove 23 can be circular, rectangular or other shapes. Each connecting portion 21 can be provided with the same groove 23.
[0048] The aforementioned conducting portion 22 is spaced apart from the groove 23 on each connecting portion 21, and the distance between the conducting portion 22 and the groove 23 is not less than 10 mm and not greater than 15 mm, for example, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm or 15 mm. The distance between different grooves 23 and the conducting portion 22 can be different.
[0049] Through the above range of distance, the conductivity can be maximized without affecting the welding. It should be noted that since the first conductive layer 221 and the connecting portion 21 are an integral structure with the same thickness, there can be no visually observable boundary between them. The distance between the conducting portion 22 and the groove 23 is the distance between the orthographic projection of the second conductive layer 222 on the first conductive layer 221 and the groove 23, and the distance can be the minimum distance between the groove 23 and the second conductive layer 222, that is, the distance at the closest position.
[0050] Further, as shown in Figure 5 and Figure 6As shown, in some embodiments of the present disclosure, the connecting portion 21 can further be provided with one or more limiting holes 24, each of which can have the same or different shape and size. The limiting holes 24 can be matched with the protruding structure on the shell 11 of the battery monomer 1 to position the busbar 2. The protruding structure can be a structure specially used for positioning or a structure of an NTC temperature sensor or other access circuit.
[0051] In addition, in some embodiments of the present disclosure, the conducting portion 22 can have a curved structure, which can be arc-shaped or wavy, and can withstand certain deformation to prevent the busbar 2 from being broken due to thermal expansion and contraction or collision.
[0052] As shown in FIGS. 1 and 2, the busbar 2 can be provided with a connecting portion 21 and a conducting portion 22. Figure 3 and Figure 4 As shown in FIGS. 1 and 2, the busbar 2 can be provided with a connecting portion 21 and a conducting portion 22.
[0053] The integrated busbar 3 can further include a circuit board and an insulating structural member. The circuit board and the busbar 2 can be arranged on the insulating structural member, and the circuit board can be connected with the busbar 2 to collect signals such as temperature and voltage of the cell 12 in the battery monomer 1.
[0054] As shown in FIGS. 1 and 2, the busbar 2 can be provided with a connecting portion 21 and a conducting portion 22. Figure 3
[0055] The first insulating support member 31 can be arranged on one side of the busbar 2, i.e., the side of the busbar 2 close to the shell 11 of the battery monomer 1. The first insulating support member 31 can be connected with the conducting portion 22 of the busbar 2 and can abut against the shell 11 of the battery monomer 1, thereby supporting the busbar 2 to prevent deformation and collapse and also serving as an insulating isolation.
[0056] The second insulating support member 32 includes a support portion 321 and a separation portion 322 connected with the support portion 321. The separation portion 322 is separated between two adjacent busbars 2, and the support portion 321 is arranged on one side of the busbar 2, i.e., the side close to the shell 11 of the battery monomer 1. The support portion 321 can be connected with the connecting portions 21 of the two adjacent busbars 2 and can abut against the shell 11 of the battery monomer 1, thereby supporting the busbar 2 to prevent deformation and collapse and also serving as an insulating isolation.
[0057] As shown in FIGS. 1 and 2, the busbar 2 can be provided with a connecting portion 21 and a conducting portion 22. Figures 2-4 As shown, the embodiments of the present disclosure also provide a battery pack, which can include a plurality of battery cells 1 and the integrated busbar 3 of any of the above; the battery cell 1 includes a shell 11 and a pole 13 arranged at one end of the shell 11; and the partial poles 13 of two adjacent battery cells 1 are electrically connected by the busbar 2.
[0058] In some embodiments of the present disclosure, the battery pack can include a plurality of battery modules, each of which can include an integrated busbar 3 and a plurality of battery cells 1, and the plurality of battery cells 1 are connected in series or parallel by the busbars 2 of the integrated busbar 3. Of course, in other embodiments of the present disclosure, all the battery cells 1 in the battery pack can be connected by the busbars 2 of one or more integrated busbars 3, without distinguishing the battery modules.
[0059] In addition, the battery pack can also include a tray 4, a cover plate 5 and a box 6, the battery cells 1 are arranged on the tray 4 and located in the box 6, the cover plate 5 is arranged on the side of the battery cells 1 away from the tray 4, and is used to close the box 6. The cover plate 5 and the integrated busbar 3 can also be filled with foaming glue or other insulating materials.
[0060] The embodiments of the present disclosure also provide a vehicle, which can include the battery pack of any of the above. The vehicle has all the beneficial effects of the above battery pack. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc., and the embodiments of the present disclosure do not make special restrictions on the above vehicles.
[0061] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the aspects disclosed herein. The present application is intended to cover any variations, uses or adaptive changes of this disclosure that follow the general principles of the present disclosure and include known or customary technical methods not disclosed in the present disclosure. The specification and examples are only considered as exemplary, and the true scope and spirit of the present disclosure are indicated by the appended claims.
Claims
1. A busbar, characterized in that The busbar comprises a conducting part and at least two connecting parts, each of the connecting parts is electrically connected with the conducting part; the thickness of the conducting part is greater than the thickness of the connecting part, and the conducting part comprises a first conductive layer and at least one second conductive layer covering the first conductive layer, the first conductive layer is in an integrated structure with the connecting part, and the second conductive layer is electrically connected with the first conductive layer; the resistivity of the second conductive layer is less than that of the first conductive layer.
2. The busbar of claim 1, wherein The ratio of the thickness of the second conductive layer to the thickness of the first conductive layer is 1:2.5 to 1:3.
5.
3. The busbar of claim 1, wherein, The first conductive layer and the second conductive layer are matched and attached, the material of the second conductive layer is copper, and the materials of the first conductive layer and the connecting part are aluminum.
4. The busbar of claim 1, wherein The conducting part further comprises an adapter layer, the adapter layer covers the first conductive layer and is matched and attached with the first conductive layer, and the second conductive layer covers the adapter layer and is matched and attached with the adapter layer. The first conductive layer and the second conductive layer are electrically connected through the adapter layer.
5. The busbar of claim 4, wherein, The material of the adapter layer is copper-aluminum alloy.
6. The busbar of claim 1, wherein, The connecting part has a groove, and the bottom of the groove is provided with a positioning hole.
7. The busbar of claim 1, wherein The connecting part is provided with a positioning hole.
8. An integrated busbar, characterized by, The integrated busbar comprises a plurality of busbars according to any one of claims 1-7.
9. The integrated busbar of claim 8, wherein, The integrated busbar further comprises: a first insulating support provided on one side of the busbar and connected with the conducting part; a second insulating support comprising a support part and a separation part connected with the support part; the separation part is separated between adjacent two busbars, the support part is provided on one side of the busbar and connected with the connecting part.
10. A battery pack, characterized by, The battery pack comprises a plurality of battery monomers and a plurality of integrated busbars according to claim 8 or 9; the battery monomer comprises a shell and a pole provided on one end of the shell; part of the poles of adjacent two battery monomers are electrically connected through the busbar.
11. A vehicle characterized by comprising: The battery pack comprises the battery pack according to claim 10.