Busbar and battery module
By forming a closed cavity inside the busbar and filling the phase change medium, the heat generated by the busbar is absorbed, and the problem of insufficient cooling of the busbar is solved, extending the service life of the battery module and improving safety.
Patent Information
- Application Number
- CN202420645491.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-03-29
AI Technical Summary
The failure to effectively cool the busbar in the prior art leads to excessive local temperature of the battery module, affecting the service life and safety of the battery cell.
A closed cavity is formed inside the busbar, and a phase change medium is filled in the cavity, absorbing the heat generated by the busbar through the phase change of the phase change medium, thereby achieving cooling.
It effectively reduces the temperature of the busbar, reduces the transfer of heat to the battery cell, extends the service life of the battery module, and improves the safety of the battery module.
Smart Images
Figure CN222654259U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a bus bar and a battery module. Background Art
[0002] In recent years, batteries, as a new energy source, have developed rapidly and are used in fields such as electric vehicles. During the operation of the battery module, the relevant technology adopts air cooling, liquid cooling and other technologies to cool the battery cells of the battery module to prevent the local temperature of the battery cells from being too high. During the operation of the battery module, the temperature of the bus used to connect the battery cells will also rise, but there is no means of cooling the bus in the relevant technology. The bus will also transfer heat to the connection position with the pole of the battery cell, resulting in excessively high local temperature of the battery cell, affecting the service life and safety of the battery cell. Utility Model Content
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to propose a busbar, the interior of which forms a closed cavity and a phase change medium is filled in the cavity. Through the phase change of the phase change medium, the heat generated by the busbar body can be absorbed to achieve cooling of the busbar; in addition, while effectively solving the cooling of the busbar, there is no need to introduce external cooling components, which reduces the design difficulty, releases space in the battery system, and reduces costs.
[0004] The utility model also provides a battery module having the above bus bar.
[0005] The busbar according to the first embodiment of the utility model comprises: a busbar body, in which a closed cavity is formed; and a phase change medium, in which the cavity is filled.
[0006] According to the busbar of the embodiment of the utility model, a closed cavity is formed inside the busbar body and a phase change medium is filled in the cavity. The heat generated by the busbar body can be absorbed through the phase change of the phase change medium, thereby realizing the cooling of the busbar. In addition, while effectively solving the cooling problem of the busbar, there is no need to introduce external cooling components, thereby reducing the design difficulty, freeing up space in the battery system, and reducing costs.
[0007] According to some embodiments of the present invention, the busbar body is in an elongated strip shape, and the cavity extends along the length direction of the busbar body.
[0008] According to some embodiments of the present invention, the cavities are multiple and spaced apart, and at least some of the cavities are arranged along the width direction of the busbar body.
[0009] According to some embodiments of the present invention, the cross-section of the cavity is circular, the diameter of the cavity is d, the spacing between adjacent cavities is b, the minimum distance from the inner wall of the cavity to the outer surface of the bus body is a, and a, b, and d satisfy: a=b, 1 / 3d<b<d.
[0010] According to some embodiments of the present invention, the inner wall of the cavity is covered with an anti-corrosion layer, and the anti-corrosion layer is a nickel layer and / or the thickness of the anti-corrosion layer is in the range of 5um to 10um.
[0011] According to some embodiments of the present utility model, the phase change medium is a solid-liquid phase change medium;
[0012] The volume change rate of the phase change medium before and after the phase change is not greater than 5%, and / or when the phase change medium is in the solid phase, the ratio of the volume of the phase change medium to the volume of the corresponding cavity is not greater than 95%.
[0013] According to some embodiments of the present invention, the phase change medium is a solid-liquid phase change medium.
[0014] According to some embodiments of the present invention, the phase change temperature of the phase change medium is 45°C to 85°C; and / or the resistivity of the phase change medium is greater than 10 6 Ohm / cm.
[0015] According to some embodiments of the utility model, the bus body includes a main body and a cover body that are independently formed, and the main body and the cover body are arranged along the length direction of the bus body. The cavity is formed in the main body, and the end face of the main body adjacent to the cover body is the installation end face. The cavity passes through the installation end face along the length direction of the main body, and the cover body covers the installation end face of the main body.
[0016] According to the second aspect of the present invention, the battery module comprises: a plurality of battery cells; and a bus according to the first aspect of the present invention, wherein the bus body is electrically connected to the poles of the battery cells.
[0017] According to the battery module of the embodiment of the utility model, by setting the above-mentioned bus, a closed cavity is formed inside the bus body and a phase change medium is filled in the cavity. Through the phase change of the phase change medium, the heat generated by the bus body can be absorbed to achieve cooling of the bus, thereby reducing the heat transferred from the bus to the battery cell, extending the service life of the battery module, and improving the safety of the battery module.
[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0020] Figure 1 is a schematic diagram of a bus bar according to some embodiments of the utility model;
[0021] Figure 2 yes Figure 1 An exploded view of the busbar in Figure 1;
[0022] Figure 3 yes Figure 2 A schematic diagram of the main body of the bus in FIG.
[0023] Figure 4 yes Figure 3 The main view of the subject in .
[0024] Reference numerals:
[0025] 100. Bus;
[0026] 10. busbar body; 11. cavity; 12. main body; 121. mounting end surface; 13. cover body;
[0027] 20. Phase change medium. DETAILED DESCRIPTION
[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0029] Reference below Figure 1-Figure 4 A busbar 100 according to an embodiment of the present invention is described. The busbar 100 is applied to a battery module.
[0030] According to the bus 100 of the embodiment of the first aspect of the utility model, it includes: a bus body 10 and a phase change medium 20, a closed cavity 11 is formed in the bus body 10, the bus body 10 is a metal part, for example, the bus body 10 can be a copper part, and the phase change medium 20 is filled in the cavity 11.
[0031] For example, the phase change medium 20 has a first phase and a second phase. When the temperature of the bus 100 is low, the phase change medium 20 is in the first phase. When the temperature of the bus 100 is high, the phase change medium 20 is in the second phase. When the temperature of the bus 100 increases, the phase change medium 20 can undergo a phase change from the first phase to the second phase. When the temperature of the bus 100 decreases, the phase change medium 20 can undergo a phase change from the second phase to the first phase. The first phase can be a solid phase, and the second phase can be a liquid phase; or the first phase can be a liquid phase, and the second phase can be a gas phase.
[0032] When the battery module is working, the temperature of the bus 100 rises, and the phase change medium 20 in the cavity 11 undergoes a phase change, for example, the phase change medium 20 changes from the first phase to the second phase. During the phase change process of the phase change medium 20 in the cavity 11, the heat of the bus body 10 is absorbed, so that the bus body 10 can be cooled and the temperature of the bus body 10 can be reduced. When the battery module is not working, the temperature of the bus body 10 decreases, and the phase change medium 20 in the cavity 11 can undergo a phase change, for example, the phase change medium 20 changes from the second phase to the first phase, and the heat released by the phase change medium 20 can be dissipated through the bus body 10.
[0033] According to the bus 100 of the embodiment of the utility model, a closed cavity 11 is formed inside the bus body 10 and a phase change medium 20 is filled in the cavity 11. Through the phase change of the phase change medium 20, the heat generated by the bus body 10 can be absorbed to achieve the cooling of the bus 100. In addition, while effectively solving the cooling of the bus 100, there is no need to introduce external cooling components, which reduces the design difficulty, releases space in the battery system, and reduces costs.
[0034] According to some embodiments of the present invention, referring to Figure 1-Figure 3 The busbar body 10 is in the shape of an elongated strip, the cross section of the busbar body 10 may be rectangular, and the cavity 11 extends along the length direction of the busbar body 10. By setting the cavity 11 to extend along the length direction of the busbar body 10, different positions along the length direction of the busbar 100 can be effectively cooled.
[0035] According to some embodiments of the present invention, referring to Figure 2-Figure 4 , there are multiple cavities 11 arranged at intervals, and at least some of the cavities 11 are arranged along the width direction of the bus body 10. At least some of the cavities 11 are arranged along the width direction of the bus body 10, which may include the following situations: some of the cavities 11 may be arranged along the width direction of the bus body 10, and another part of the cavities 11 may be arranged along the thickness direction of the bus body 10; or all of the cavities 11 may be arranged along the width direction of the bus body 10. For example, Figure 4 In the example, there are four cavities 11, and the four cavities 11 are arranged along the width direction of the busbar body 10. By arranging a plurality of cavities 11 arranged at intervals, different positions of the busbar body 10 can be effectively and evenly cooled.
[0036] According to some embodiments of the present invention, referring to Figure 4 , the cross section of the cavity 11 is circular, the diameter of the cavity 11 is d, the spacing between adjacent cavities 11 is b, the minimum distance from the inner wall of the cavity 11 to the outer surface of the busbar body 10 is a, and a, b, d satisfy: a=b, 1 / 3d<b<d, for example, the value of b can be 2 / 5d, 1 / 2d, 3 / 5d, etc. By making the spacing b between adjacent cavities 11 the same as the minimum distance a from the inner wall of the cavity 11 to the outer surface of the busbar body 10, different positions of the busbar body 10 can be uniformly and effectively cooled; and by making the spacing b between adjacent cavities 11 greater than 1 / 3 of the diameter d of the cavity 11 and less than the diameter d of the cavity 11, the cavity 11 can have a larger volume, so that the volume of the phase change medium 20 filled in the cavity 11 can be larger, so that the heat of the busbar body 10 can be fully and effectively absorbed, and the structural strength and overcurrent capacity of the busbar body 10 can be guaranteed.
[0037] According to some embodiments of the present invention, the inner wall of the cavity 11 is covered with an anti-corrosion layer. By covering the inner wall of the cavity 11 with the anti-corrosion layer, the bus body 10 can be reduced from being corroded by the phase change medium 20, thereby ensuring the structural strength and overcurrent capability of the bus body 10.
[0038] Optionally, the anti-corrosion layer may be covered on the inner wall of the cavity 11 by coating or electroplating.
[0039] Optionally, the anti-corrosion layer may be a nickel layer, which has good corrosion resistance.
[0040] Optionally, the thickness of the anti-corrosion layer is in the range of 5um to 10um, for example, the thickness of the anti-corrosion layer may be 5um, 6um, 7um, 8um, 9um, 10um, etc. By setting the thickness of the anti-corrosion layer in the range of 5um to 10um, the anti-corrosion layer can protect the bus body 10 and reduce the volume occupied by the cavity 11, so that more volume in the cavity 11 is used to accommodate the phase change medium 20.
[0041] According to some embodiments of the present invention, the phase change medium 20 is a solid-liquid phase change medium 20, and the volume change rate of the phase change medium 20 before and after the phase change is not greater than 5%. By limiting the volume change rate of the phase change medium 20 before and after the phase change to be smaller, a larger amount of phase change medium 20 can be filled in the cavity 11, and deformation, cracking, etc. of the bus 100 caused by the expansion force on the bus body 10 due to excessive volume change can be avoided.
[0042] According to some embodiments of the present invention, the phase change medium 20 is a solid-liquid phase change medium 20, and when the phase change medium 20 is in the solid phase, the ratio of the volume of the phase change medium 20 to the volume of the corresponding cavity 11 is not greater than 95%. In this way, when the phase change medium 20 changes from the solid phase to the liquid phase, sufficient space can be reserved for the volume change caused by the phase change, thereby avoiding deformation, cracking, etc. of the bus 100 caused by the expansion force of the phase change medium 20 on the bus body 10 after the phase change due to the small reserved space.
[0043] According to some embodiments of the present invention, the phase change medium 20 is a solid-liquid phase change medium 20. For example, the phase change medium 20 includes paraffin, which has a low cost and is easy to obtain.
[0044] According to some embodiments of the present invention, the phase change temperature of the phase change medium 20 is 45°C to 85°C, for example, the phase change temperature of the phase change medium 20 is 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C. By setting the phase change temperature of the phase change medium 20 to 45°C to 85°C, the phase change temperature of the phase change medium 20 can be within the temperature range reached by the bus 100 when the battery module is working, so that when the battery module is working, the phase change medium 20 located in the bus 100 can undergo phase change, thereby absorbing the heat of the bus body 10.
[0045] According to some embodiments of the present invention, the resistivity of the phase change medium 20 is greater than 106 ohms / cm. By setting the resistivity of the phase change medium 20 to be relatively large, the influence of the phase change medium 20 on the current on the bus body 10 is reduced.
[0046] According to some embodiments of the present invention, referring to Figure 1-Figure 3The busbar body 10 includes a main body 12 and a cover body 13 which are independently formed. The main body 12 and the cover body 13 are arranged along the length direction of the busbar body 10, and the main body 12 and the cover body 13 can be welded. A cavity 11 is formed in the main body 12, and the end face of the main body 12 adjacent to the cover body 13 is a mounting end face 121. The cavity 11 passes through the mounting end face 121 along the length direction of the main body 12. In the process of manufacturing the busbar 100, the phase change medium 20 can be filled into the cavity 11 laterally through the mounting end face 121 of the main body 12. After the filling is completed, the mounting end face 121 of the main body 12 is covered by the cover body 13, and the cover body 13 is connected to the mounting end face 121, for example, the cover body 13 is welded to the mounting end face 121, so that the side of the cavity 11 that passes through the mounting end face 121 can be blocked, thereby forming a closed cavity 11.
[0047] The battery module according to the second embodiment of the present invention comprises: a plurality of battery cells and a busbar 100 according to the first embodiment of the present invention, wherein the busbar body 10 is electrically connected to the poles of the battery cells.
[0048] According to the battery module of the embodiment of the utility model, by setting the above-mentioned bus 100, a closed cavity 11 is formed inside the bus body 10 and a phase change medium 20 is filled in the cavity 11. Through the phase change of the phase change medium 20, the heat generated by the bus body 10 can be absorbed to achieve cooling of the bus 100, thereby reducing the heat transferred from the bus 100 to the battery cell, extending the service life of the battery module, and improving the safety of the battery module.
[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0050] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. A busbar, characterized in that: include: A busbar body, wherein a closed cavity is formed in the busbar body; A phase change medium is filled in the cavity.
2. The busbar according to claim 1, characterized in that: The busbar body is in an elongated strip shape, and the cavity extends along the length direction of the busbar body.
3. The busbar according to claim 2, characterized in that: The cavities are multiple and spaced apart from each other, and at least some of the cavities are arranged along the width direction of the busbar body.
4. The busbar according to claim 3, characterized in that: The cross section of the cavity is circular, the diameter of the cavity is d, the spacing between adjacent cavities is b, the minimum distance from the inner wall of the cavity to the outer surface of the bus body is a, and a, b, and d satisfy: a=b, 1 / 3d<b<d.
5. The busbar according to claim 1, characterized in that: The inner wall of the cavity is covered with an anti-corrosion layer, and the anti-corrosion layer is a nickel layer and / or the thickness of the anti-corrosion layer ranges from 5um to 10um.
6. The busbar according to claim 1, characterized in that: The phase change medium is a solid-liquid phase change medium; The volume change rate of the phase change medium before and after the phase change is not greater than 5%, and / or when the phase change medium is in the solid phase, the ratio of the volume of the phase change medium to the volume of the corresponding cavity is not greater than 95%.
7. The busbar according to claim 1, characterized in that: The phase change medium is a solid-liquid phase change medium.
8. The busbar according to claim 1, characterized in that: The phase change temperature of the phase change medium is 45°C to 85°C; and / or the resistivity of the phase change medium is greater than 10 6 Ohm / cm.
9. The busbar according to any one of claims 1 to 8, characterized in that: The busbar body includes a main body and a cover body which are independently formed, and the main body and the cover body are arranged along the length direction of the busbar body. The cavity is formed in the main body, and the end face of the main body adjacent to the cover body is the mounting end face. The cavity passes through the mounting end face along the length direction of the main body, and the cover body covers the mounting end face of the main body.
10. A battery module, characterized in that: include: Multiple battery cells; According to the busbar according to any one of claims 1 to 9, the busbar body is electrically connected to the pole of the battery cell.