Battery pack and electric two-wheeled vehicle
The battery pack design with a connection board separating electric cell and BMS modules simplifies assembly and reduces interference, enhancing the functionality and stability of the battery pack.
Patent Information
- Application Number
- CN202421700124.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-07-17
AI Technical Summary
In the existing electric two-wheeler battery pack, the connection structure of the battery cell module and the BMS module is complex, it is inconvenient to assemble and is easy to interfere with each other and affect work.
The connecting plate is used to separate the battery cell module and the BMS module and connect it to the box through a fixture to simplify the structure and reduce mutual interference.
It realizes the simple structure of the battery pack and the easy assembly, reduces the mutual interference between the electric field and heat of the battery cell module and the BMS module, and improves practicality and safety.
Smart Images
Figure CN223109067U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric two-wheel vehicles, and particularly relates to a battery pack and an electric two-wheel vehicle. Background Art
[0002] In recent years, electric two-wheel vehicles have become one of the main means of transportation for the public's daily travel. The power source of electric two-wheel vehicles is a battery pack, which generally includes a box body, a battery cell module, and a BMS module. The battery cell module and the BMS module are installed in the box body. In related technologies, the battery cell module and the BMS module are respectively connected to the box body through two connection structures, with a complex structure and troublesome assembly. In addition, the battery cell module and the BMS module are prone to interference with each other, affecting the operation. Content of the Utility Model
[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery pack, which not only has a simpler structure and more convenient assembly, but also can reduce the interference between the battery cell module and the BMS module, affecting the operation.
[0004] The utility model also provides an electric two-wheel vehicle with the above battery pack.
[0005] The battery pack according to the first aspect embodiment of the utility model includes a box body, a battery cell module, a BMS module, and a connecting plate. The battery cell module is located in the box body, the BMS module is located in the box body, the connecting plate is arranged between the battery cell module and the BMS module to separate the battery cell module and the BMS module. Both the battery cell module and the BMS module are connected to the connecting plate, and the connecting plate is provided with fixing parts, and the fixing parts are connected to the box body.
[0006] The battery pack according to the embodiment of the utility model has at least the following beneficial effects:
[0007] In the utility model, both the battery cell module and the BMS module in the box body are connected to the connecting plate, and the connecting plate is connected to the box body through the fixing parts. Therefore, the battery cell module and the BMS module do not need to be respectively provided with connection structures to connect the box body, making the structure of the battery pack simpler and the assembly more convenient. Moreover, the battery cell module and the BMS module are respectively located on both sides of the connecting plate, and the connecting plate separates the battery cell module and the BMS module, thereby reducing the interference between the battery cell module and the BMS module, affecting the operation. For example, it can reduce the interference between the electric fields of the battery cell module and the BMS module, and has better practicability.
[0008] According to some embodiments of the present utility model, the fixing member includes two fixing bars, the two fixing bars are located on opposite sides of the connecting plate, and fixing pieces are formed by bending both ends of the fixing bars, and the fixing pieces are connected to the side wall of the box body.
[0009] According to some embodiments of the present utility model, the surface in the thickness direction of the fixing piece is attached to the side wall of the box body, and the fixing piece and the side wall of the box body are connected by fasteners.
[0010] According to some embodiments of the present utility model, an elastic member is provided on the side wall of the box body corresponding to the fixing piece, and the fixing piece is connected to the elastic member.
[0011] According to some embodiments of the present utility model, the elastic member is provided in a U shape, the elastic member includes two connecting segments and an arc segment located between the two connecting segments, and the two connecting segments are respectively connected to the fixing piece and the side wall of the box body.
[0012] According to some embodiments of the present utility model, the battery cell module includes a module bracket, a plurality of busbars, and battery cell units. The module bracket is connected to the connecting plate, the plurality of busbars are arranged on the module bracket, the battery cell units include a plurality of battery cells arranged side by side, the battery cells are connected to the busbars, and an EVA foam is provided between two adjacent battery cells.
[0013] According to some embodiments of the present utility model, the module bracket includes a mounting plate and a plurality of support portions. The busbars are arranged on the mounting plate, the plurality of support portions are arranged on the outer peripheral wall of the mounting plate, one end of the support portion close to the battery cell unit abuts against the outer side wall of the battery cell unit, the connecting plate is connected to the plurality of support portions, and there is a gap between the connecting plate and the mounting plate.
[0014] According to some embodiments of the present utility model, a plurality of support columns are provided on the side of the connecting plate facing away from the battery cell module, the BMS module is connected to the plurality of support columns, and there is a gap between the BMS module and the connecting plate.
[0015] According to some embodiments of the present utility model, the battery cell module, the connecting plate, and the BMS module are arranged in sequence from bottom to top, and insulating plates are provided on the outer side and bottom end of the battery cell module.
[0016] According to an embodiment of the second aspect of the present utility model, an electric two-wheeler includes the battery pack described in the above-mentioned embodiment of the first aspect.
[0017] According to the electric two-wheeler of the embodiment of the present utility model, it has at least the following beneficial effects:
[0018] Using the battery pack according to the embodiment of the first aspect of the present utility model, both the battery cell module and the BMS module in the box body are connected to the connection plate, and the connection plate is connected to the box body through the fixing member. Further, the battery cell module and the BMS module do not need to be respectively provided with connection structures to connect the box body, so that the structure of the battery pack is simpler and the assembly is more convenient. Moreover, the battery cell module and the BMS module are respectively located on both sides of the connection plate, and the connection plate separates the battery cell module and the BMS module. Further, the situation that the battery cell module and the BMS module interfere with each other and affect the work can be reduced. For example, the situation that the electric field of the battery cell module and the electric field of the BMS module interfere with each other can be reduced, and the practicability is better.
[0019] Additional aspects and advantages of the present utility model will be partially given in the following description, and some additional aspects and advantages will become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings
[0020] The following further describes the present utility model in conjunction with the drawings and embodiments, where:
[0021] Figure 1 is a schematic diagram of the overall structure of the battery pack of the present utility model;
[0022] Figure 2 is a schematic diagram of the structure of the battery pack after removing the cover;
[0023] Figure 3 is a connection schematic diagram of the battery cell module, the BMS module and the connection plate;
[0024] Figure 4 is a schematic diagram of the structure of the battery cell module;
[0025] Figure 5 is another installation schematic diagram of the connection plate.
[0026] Reference Numerals in the Drawings:
[0027] Box body 100; Elastic member 101; Connection section 102; Arc section 103; Housing 104; Cover 105; Power supply terminal 106; Balancing socket 107; Communication socket 108; Handle 109;
[0028] Battery cell module 200; Module bracket 201; Bus bar 202; Battery cell unit 203; Battery cell 204; Mounting plate 205; Support portion 206; Insulating plate 207; Partition wall 208;
[0029] BMS module 300;
[0030] Connection plate 400; Fixing member 401; Fixing strip 402; Fixing piece 403; Support column 404. Detailed Embodiments
[0031] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.
[0032] In the description of the present utility model, it should be understood that with respect to the orientation description, such as up, down, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.
[0033] In the description of the present utility model, "a plurality of" refers to two or more. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.
[0034] In the description of the present utility model, unless otherwise clearly defined, words such as "arrangement", "installation", "connection", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.
[0035] Reference will be made below to Figures 1 to 5 Describe a battery pack and an electric two-wheeler according to an embodiment of the present utility model.
[0036] The battery pack according to the first aspect embodiment of the present utility model, as Figures 1 to 5 shown, includes a box body 100, a battery cell module 200, a BMS module 300, and a connection plate 400.
[0037] For example, the box body 100 may include a housing 104 and a cover 105. An accommodation cavity with an open top is formed inside the housing 104. The battery cell module 200, the BMS module 300, and the connection board 400 are all located in the accommodation cavity. The cover 105 can be connected to the top of the housing 104 by fasteners, or the cover 105 can be snap-fitted to the top of the housing 104. In addition, one side of the cover 105 can be rotatably connected to one side of the top of the housing 104, and the other side of the cover 105 can be connected or snap-fitted to the other side of the top of the housing 104 by fasteners. The cover 105 can be provided with a power terminal 106 for connecting a power line, an equalization socket 107 for connecting to an equalizer, a communication socket 108 for connecting to a communication device, and a handle 109 for convenient carrying.
[0038] The battery cell module 200 is located inside the box body 100. The battery cell module 200 may include a plurality of battery cells 204 arranged side by side, and the battery cells 204 are used for storing electrical energy.
[0039] The BMS module 300 is located inside the box body 100. The BMS module 300 includes a mounting substrate and a battery management system provided on the mounting substrate. BMS is the English abbreviation of the battery management system. The BMS module 300 can improve the utilization rate of the battery, prevent the battery from overcharging and over-discharging, extend the service life of the battery, and monitor the state of the battery. The power line, equalization wire harness, sampling wire harness, and communication wire harness of the battery pack can all be connected to the BMS module 300. The power line is also connected to the total positive busbar on the battery cell module 200 and the total negative busbar on the battery cell module 200.
[0040] The connection board 400 is provided between the battery cell module 200 and the BMS module 300. The battery cell module 200 and the BMS module 300 are located on both sides of the thickness direction of the connection board 400. The connection board 400 separates the battery cell module 200 and the BMS module 300 to reduce the situation where the battery cell module 200 and the BMS module 300 interfere with each other and affect the operation. For example, it can reduce the interference between the electric field of the battery cell module 200 and the electric field of the BMS module 300. The battery cell module 200 and the BMS module 300 are both connected to the connection board 400. For example, it can be connected by fasteners, snap-fitted, or welded. The connection board 400 is provided with a fixing member 401, and the fixing member 401 is connected to the box body 100. For example, it can be connected by fasteners, snap-fitted, or welded.
[0041] In the present utility model, the battery cell module 200 and the BMS module 300 inside the box body 100 are both connected to the connection plate 400, and the connection plate 400 is connected to the box body 100 through the fixing member 401. Furthermore, the battery cell module 200 and the BMS module 300 do not need to be respectively provided with connection structures to connect to the box body 100, thereby making the battery pack structure simpler and more convenient for assembly. Moreover, the battery cell module 200 and the BMS module 300 are respectively located on both sides of the connection plate 400, and the connection plate 400 separates the battery cell module 200 and the BMS module 300. Furthermore, it can reduce the situation where the battery cell module 200 and the BMS module 300 interfere with each other and affect the operation, for example, it can reduce the situation where the electric fields of the battery cell module 200 and the BMS module 300 interfere with each other, or it can reduce the situation where the heat generated by the battery cell module 200 and the heat generated by the BMS module 300 interfere with each other, and the practicability is better.
[0042] In some embodiments of the present utility model, such as Figure 2 , Figure 3 and Figure 5 shown, the fixing member 401 includes two fixing bars 402. The two fixing bars 402 are located on opposite sides of the connection plate 400. Fixing pieces 403 are formed by bending the two ends of the fixing bar 402, and the fixing pieces 403 are connected to the side wall of the box body 100. For example, the two fixing bars 402 can be attached to the side of the connection plate 400 facing away from the battery cell module 200. The fixing bar 402 can be connected to the connection plate 400 through fasteners or welding. The fixing bar 402 can extend along the edge of the connection plate 400, and the two fixing pieces 403 of the fixing bar 402 can be close to two adjacent corners of the connection plate 400.
[0043] In this embodiment, the fixing member 401 is arranged in this way, which is not only simple in structure, but also more stable in connection with the box body 100. In addition, the connection is more convenient.
[0044] It should be noted that the fixing member 401 can also be other structures. For example, it can include a plurality of connection blocks, and the plurality of connection blocks are arranged along the outer peripheral wall of the connection plate 400, and the connection blocks are connected to the box body 100.
[0045] In some embodiments of the present utility model, such as Figure 2 shown, the surface in the thickness direction of the fixing piece 403 is attached to the side wall of the box body 100, and the fixing piece 403 is connected to the side wall of the box body 100 through fasteners. In this way, not only the connection and disassembly are more convenient, but also the surface in the thickness direction of the fixing piece 403 is attached to the side wall of the box body 100, which can reduce the overall structure of the connection plate 400 and the battery cell module 200 and the BMS module 300 connected to the connection plate 400 from moving randomly inside the box body 100, thereby making the installation of the battery cell module 200 and the BMS module 300 more stable.
[0046] In some other embodiments of the present utility model, such as Figure 5 shown, it may also be that an elastic member 101 is provided on the side wall of the box body 100 corresponding to the fixing piece 403, and the fixing piece 403 is connected to the elastic member 101. In the prior art, the BMS module 300 is generally directly fixed to the box body 100 by bolts, without a vibration damping structure. During use, vibration is likely to occur, resulting in the fastening failure of the BMS module 300 or the connection failure of the wire harness.
[0047] In this embodiment, an elastic member 101 is provided on the side wall of the box body 100, and the fixing piece 403 is connected to the elastic member 101. In this way, vibration of the connecting plate 400 and the BMS module 300 connected to the connecting plate 400 can be effectively reduced, thereby reducing the fastening failure of the BMS module 300 or the connection failure of the wire harness.
[0048] Furthermore, as Figure 5 shown, the elastic member 101 is set to be U-shaped. The elastic member 101 includes two connecting sections 102 and an arc section 103 located between the two connecting sections 102. The two connecting sections 102 are respectively connected to the fixing piece 403 and the side wall of the box body 100. With such a setting, not only is the structure relatively simple, but also the vibration damping effect is better.
[0049] It should be noted that the elastic member 101 can also be other suitable shapes, such as C-shaped. The connecting section 102 and the fixing piece 403 and the side wall of the box body 100 can be welded or connected by fasteners.
[0050] In some embodiments of the present utility model, such as Figure 3 and Figure 4 shown, the battery cell module 200 includes a module bracket 201, a plurality of busbars 202, and battery cell units 203. The module bracket 201 is connected to the connecting plate 400. A plurality of busbars 202 are arranged on the module bracket 201. The battery cell units 203 include a plurality of battery cells 204 arranged side by side. The battery cells 204 are connected to the busbars 202. For example, the battery cells 204 and the busbars 202 can be continuously laser welded to ensure the connection strength and reliability, reduce the contact resistance, improve the consistency of the battery cell module 200. An EVA foam is provided between two adjacent battery cells 204. The EVA foam has low hardness and high resilience properties, can absorb the battery swelling stress and play a buffering role; when the battery cell 204 gets out of control due to heat, the EVA foam can play a heat insulation role, inhibit heat diffusion, and delay the occurrence of an accident; when the battery cell 204 catches fire, the flame retardant effect of the EVA foam can delay the spread of the fire and increase the escape time; the EVA foam has excellent resilience and a wide compression ratio and can be used for positioning.
[0051] In some embodiments of the present utility model, such as Figure 3 and Figure 4As shown in the figure, the module bracket 201 includes a mounting plate 205 and a plurality of support portions 206. The bus bar 202 is disposed on the mounting plate 205, and the plurality of support portions 206 are disposed on the outer peripheral wall of the mounting plate 205. One end of the support portion 206 close to the battery cell unit 203 abuts against the outer side wall of the battery cell unit 203. The connecting plate 400 is connected to the plurality of support portions 206, and there is a gap between the connecting plate 400 and the mounting plate 205. For example, the support portion 206 can extend to both sides outside the thickness direction of the mounting plate 205. One end of the support portion 206 close to the battery cell unit 203 abuts against the outer side wall of the battery cell unit 203, and the end of the support portion 206 far from the battery cell unit 203 is connected to the connecting plate 400. The connecting plate 400 and the plurality of support portions 206 can be connected by fasteners. With such a setting, not only can the battery cell unit 203 be limited and fixed, making the battery cell unit 203 more stable, but also it is convenient to connect the connecting plate 400 to the module bracket 201. In addition, there is a gap between the connecting plate 400 and the mounting plate 205, so that the heat dissipation effect is better.
[0052] In some embodiments of the present invention, as Figure 3 shown, a plurality of support columns 404 are provided on the side of the connecting plate 400 facing away from the battery cell module 200. The BMS module 300 is connected to the plurality of support columns 404, and there is a gap between the BMS module 300 and the connecting plate 400. For example, four support columns 404 can be provided and located at the four corner positions of the BMS module 300. The support columns 404 can be provided with mounting holes, and the BMS module 300 can be connected to the support columns 404 by fasteners. In this embodiment, by providing the support columns 404, not only is it more convenient to install the BMS module 300, but also there is a gap between the BMS module 300 and the connecting plate 400, so that the heat dissipation effect is better.
[0053] In some embodiments of the present invention, as Figure 3 shown, the battery cell module 200, the connecting plate 400, and the BMS module 300 are arranged in sequence from bottom to top, which is more convenient for assembly. Moreover, the battery cell module 200 with stronger load-bearing capacity is located at the bottom, and the BMS module 300 with weaker load-bearing capacity is located at the top, which can avoid damage to the BMS module 300, and the wiring of the wire harness connected to the BMS module 300 is more convenient. Insulating plates 207 are provided on both the outer side and the bottom end of the battery cell module 200, and the insulation effect is better, which can reduce situations such as short circuits and electric leakage, and the safety is better.
[0054] It should be noted that the insulating plate 207 can also be an epoxy resin plate or an insulating rubber plate, etc.
[0055] In some embodiments of the present invention, as Figure 4As shown, the bus bar 202 is provided with two rows, and the module bracket 201 is provided with a partition wall 208 on the side close to the two rows of bus bars 202. The partition wall 208 can be made of an electrically insulating material. The setting of the partition wall 208 can ensure sufficient electrical clearance and creepage distance, and the safety is better.
[0056] The electric two-wheeler according to the second aspect embodiment of the present utility model includes the battery pack of the first aspect embodiment described above.
[0057] According to the electric two-wheeler of the embodiment of the present utility model, by adopting the battery pack of the first aspect embodiment of the present utility model, the battery cell module 200 and the BMS module 300 in the box body 100 are both connected to the connection plate 400, and the connection plate 400 is connected to the box body 100 through the fixing member 401. Furthermore, the battery cell module 200 and the BMS module 300 do not need to be respectively provided with connection structures to connect the box body 100, so that the structure of the battery pack is simpler and the assembly is more convenient. Moreover, the battery cell module 200 and the BMS module 300 are respectively located on both sides of the connection plate 400, and the connection plate 400 separates the battery cell module 200 and the BMS module 300. Furthermore, the situation that the battery cell module 200 and the BMS module 300 interfere with each other and affect the work can be reduced. For example, the situation that the electric field of the battery cell module 200 and the electric field of the BMS module 300 interfere with each other can be reduced, and the practicability is better.
[0058] It should be noted that since the electric two-wheeler can adopt all the technical solutions of the battery pack of the first aspect embodiment described above, it at least has all the beneficial effects brought by the technical solutions of the first aspect embodiment described above. These additional beneficial effects will not be elaborated here.
[0059] It can be understood that the other components and operations of the electric two-wheeler according to the embodiment of the present utility model are known to those of ordinary skill in the art, and will not be described in detail here.
[0060] The embodiments of the present utility model have been described in detail above in conjunction with the drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made without departing from the purpose of the present utility model within the scope of knowledge possessed by those of ordinary skill in the art.
Claims
1. A battery pack, characterized in that, Comprising: A box body; A battery cell module, located inside the box body; A BMS module, located inside the box body; A connecting plate, disposed between the battery cell module and the BMS module to separate the battery cell module and the BMS module. Both the battery cell module and the BMS module are connected to the connecting plate. The connecting plate is provided with fixing members, and the fixing members are connected to the box body.
2. The battery pack according to claim 1, characterized in that, The fixing members include two fixing bars. The two fixing bars are located on opposite sides of the connecting plate. Fixing pieces are formed by bending the two ends of the fixing bars, and the fixing pieces are connected to the side wall of the box body.
3. The battery pack according to claim 2, wherein The surface in the thickness direction of the fixing piece is attached to the side wall of the box body, and the fixing piece is connected to the side wall of the box body through fasteners.
4. The battery pack according to claim 2, wherein Elastic members are provided on the side wall of the box body corresponding to the fixing pieces, and the fixing pieces are connected to the elastic members.
5. The battery pack according to claim 4, characterized in that, The elastic member is arranged in a U shape. The elastic member includes two connecting segments and an arc segment located between the two connecting segments. The two connecting segments are respectively connected to the fixing piece and the side wall of the box body.
6. The battery pack according to any one of claims 1 to 5, characterized in that, The battery cell module includes: A module bracket, connected to the connecting plate; A plurality of busbars, disposed on the module bracket; Battery cell units, including a plurality of battery cells arranged side by side. The battery cells are connected to the busbars, and an EVA foam is provided between two adjacent battery cells.
7. The battery pack according to claim 6, wherein The module bracket includes: A mounting plate, on which the busbars are disposed; A plurality of supporting portions, disposed on the outer peripheral wall of the mounting plate. One end of the supporting portion close to the battery cell unit abuts against the outer side wall of the battery cell unit. The connecting plate is connected to the plurality of supporting portions, and there is a gap between the connecting plate and the mounting plate.
8. The battery pack according to any one of claims 1 to 5, characterized in that, A plurality of supporting columns are provided on the side of the connecting plate facing away from the battery cell module. The BMS module is connected to the plurality of supporting columns, and there is a gap between the BMS module and the connecting plate.
9. The battery pack according to any one of claims 1 to 5, characterized in that, The battery cell module, the connecting plate, and the BMS module are arranged in sequence from bottom to top. Insulating plates are provided on the outer side and bottom end of the battery cell module.
10. An electric two-wheeler, characterized in that, Including the battery pack according to any one of claims 1 to 9.