Lithium battery pack and electric bicycle

Abstract

The utility model relates to lithium battery pack technical field, concretely relates to a lithium battery pack and electric bicycle, wherein lithium battery pack includes: sealed connection's aluminum alloy casing and aluminum alloy upper cover and electric core module, the upper surface of aluminum alloy upper cover is equipped with first recess, the groove bottom of first recess is equipped with two second recesses of accommodating breathable waterproof membrane, one second recess is equipped with the first through -hole of intercommunication aluminum alloy casing inner space, and the other second recess is equipped with a plurality of second through -holes of intercommunication aluminum alloy casing inner space, the lower surface of upper cover is provided with the accommodating groove of second through -hole intercommunication for accommodating alarm. The utility model discloses through setting up the casing and upper cover of aluminum alloy material, has high strength, antirust and flame -retardant characteristics, can better protect electric core module. Secondly, first through -hole cooperation waterproof breathable membrane, guarantee lithium battery pack internal pressure balance, second through -hole cooperation waterproof breathable membrane, guarantee alarm sound timely and prevent external impurity from entering.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery pack technology, and more specifically, to a lithium battery pack and an electric bicycle. Background Technology

[0002] With the rapid development of the electric bicycle industry, lithium battery packs have gradually become the mainstream power source for electric bicycles due to their advantages such as high energy density and light weight. However, existing lithium battery packs for electric bicycles have many problems.

[0003] In terms of safety, lithium battery packs frequently experience fires and explosions, making it difficult to meet increasingly stringent safety standards. For example, the current national standard has clear and strict regulations on the safety of lithium battery packs, and some traditional lithium battery packs cannot meet these standards. In terms of structural design, most lithium battery packs have insufficient outer casing protection, failing to effectively cope with complex operating environments, and lack reasonable pressure balance and sound transmission design, affecting the stability and practicality of the lithium battery pack. Utility Model Content

[0004] In view of this, the present invention provides a lithium battery pack and an electric bicycle, which aim to solve the above-mentioned technical problems.

[0005] In one aspect, the present invention provides a lithium battery pack, comprising a sealed aluminum alloy shell and an aluminum alloy top cover, and a cell module disposed within the internal space of the aluminum alloy shell. The upper surface of the aluminum alloy top cover is provided with a first groove, and the bottom of the first groove is provided with two second grooves for accommodating breathable and waterproof membranes. One of the second grooves is provided with a first through hole communicating with the internal space of the aluminum alloy shell, and the other second groove is provided with a plurality of second through holes communicating with the internal space of the aluminum alloy shell. The lower surface of the top cover is provided with a receiving groove communicating with the second through holes for accommodating an alarm.

[0006] In some embodiments of this application, the lithium battery pack further includes an identifier disposed in the first groove, and there is a reserved gap between the identifier and the breathable and waterproof membrane.

[0007] In some embodiments of this application, the side wall end face of the aluminum alloy top cover that covers the aluminum alloy housing is provided with a mounting groove for accommodating the sealing ring. The inner side wall of the mounting groove is provided with a plurality of protrusions. The plurality of protrusions extend into the aluminum alloy housing and fit against the inner side wall of the aluminum alloy housing. The aluminum alloy top cover and the aluminum alloy housing are connected by a plurality of fasteners.

[0008] In some embodiments of this application, an exhaust groove communicating with the outside is provided between the bottom of the second groove and the first groove, and a reserved gap exists between the first marker and the inner wall of the first groove.

[0009] In some embodiments of this application, an exhaust groove communicating with the outside is provided between the inner wall of the second groove and the inner wall of the first groove.

[0010] In some embodiments of this application, the battery cell module is fixed to the inner wall of the aluminum alloy shell by V0 flame-retardant foam, and the battery cell module is fixed to the inner bottom surface of the aluminum alloy shell by silicone.

[0011] In some embodiments of this application, the lithium battery pack further includes a lithium battery management system disposed within the internal space of the aluminum alloy casing, and an insulating component is disposed between the lithium battery management system and the cell module.

[0012] In some embodiments of this application, the lithium battery pack further includes a 4G module and a GPS module disposed within the handle of the aluminum alloy top cover, as well as an output connector one and an output connector two disposed within the aluminum alloy top cover, wherein a sealing ring two is disposed within the output connector one and the output connector two.

[0013] In some embodiments of this application, a third groove is provided on the upper surface of the aluminum alloy cover, and a second identifier is fixedly provided in the third groove, and the second identifier does not protrude from the upper surface of the aluminum alloy cover.

[0014] Compared with existing technologies, the advantages of this utility model are as follows: First, by using an aluminum alloy shell and top cover, the structural strength of the product is greatly improved. Aluminum alloy also has excellent rust-resistant properties, preventing rusting during use. Furthermore, aluminum alloy is flame-retardant, eliminating the risk of combustion of the battery cell module compared to a plastic shell, thus enabling the lithium battery pack to achieve an IP67 protection rating, effectively preventing dust and water damage and adapting to various complex operating environments. Second, a first through-hole communicating with the internal space of the aluminum alloy shell is provided in the aluminum alloy top cover for venting, and a waterproof and breathable membrane is installed in a second groove communicating with the first through-hole in the aluminum alloy top cover. This ensures pressure balance between the internal environment of the battery cell module and the external environment within the aluminum alloy shell, preventing abnormal internal pressure from causing deformation or sealing failure of the aluminum alloy shell, while maintaining the high protection performance of the IP67 rating. Meanwhile, several second through holes connected to the internal space of the aluminum alloy shell are provided on the aluminum alloy top cover for sound transmission. The second groove where the second through holes are located is also provided with a breathable and waterproof membrane, so that the alarm sound of the alarm device located in the receiving groove connected to the second through holes inside the aluminum alloy shell can be effectively transmitted out of the box, so as to issue an alarm in time and prevent external rainwater and dust from entering through the second through holes, thus maintaining the IP67 protection level.

[0015] In another aspect, the present invention provides an electric bicycle including the aforementioned lithium battery pack.

[0016] It is understood that the electric bicycle in this embodiment has the same beneficial effects as the lithium battery pack, and will not be described in detail here. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 An exploded view of a lithium battery pack provided for an embodiment of this utility model; Figure 2 A top view of the aluminum alloy top cover provided in an embodiment of this utility model; Figure 3 A bottom view of the aluminum alloy top cover provided in an embodiment of this utility model; Figure 4 A three-dimensional structural diagram of the aluminum alloy top cover provided in this embodiment of the utility model.

[0018] In the diagram: 1. Aluminum alloy shell; 2. Aluminum alloy top cover; 21. First groove; 211. Identifier 1; 22. Second groove; 221. Breathable and waterproof membrane; 222. First through hole; 223. Second through hole; 224. Vent groove; 23. Third groove; 231. Identifier 2; 24. Receiving groove; 25. Mounting groove; 251. Protrusion; 252. Sealing ring; 26. Fastener; 27. Handle; 271. 4G module; 272. GPS module; 28. Output connector 1; 29. ​​Output connector 2; 3. Battery cell module; 4. Insulating component; 5. Lithium battery management system. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0020] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] Example 1, combined with Figure 1 As shown, this embodiment provides a lithium battery pack, including a sealed aluminum alloy shell 1 and an aluminum alloy top cover 2, and a cell module 3 disposed in the internal space of the aluminum alloy shell 1.

[0024] Preferred, combined Figure 1 , Figure 3 and Figure 4 The upper surface of the aluminum alloy cover 2 is provided with a first groove 21, and the bottom of the first groove 21 is provided with two second grooves 22 to accommodate a breathable and waterproof membrane 221; one of the second grooves 22 is provided with a first through hole 222 that connects to the internal space of the aluminum alloy shell 1, and the other second groove 22 is provided with several second through holes 223 that connect to the internal space of the aluminum alloy shell 1; the lower surface of the cover is provided with a receiving groove 24 that communicates with the second through holes 223 for accommodating the alarm.

[0025] Understandably, the aluminum alloy casing 1 and aluminum alloy top cover 2, compared to traditional plastic casings, possess high strength, rust resistance, and flame retardant properties, better protecting the battery cell module 3, avoiding the risk of combustion, and improving overall safety and durability. By setting the first through-hole 222 and cooperating with a waterproof and breathable membrane, the internal pressure of the lithium battery pack can be effectively regulated, preventing casing deformation or sealing failure due to abnormal air pressure, while maintaining a high IP67 protection rating, ensuring the lithium battery pack operates normally in various environments. The alarm sounds when the lithium battery pack malfunctions, reminding the user to handle the situation promptly, improving the safety and reliability of the lithium battery pack. The design of the second through-hole 223 allows the alarm sound to be transmitted promptly, while the breathable and waterproof membrane 221 prevents external impurities from entering, maintaining the protection rating and ensuring the lithium battery pack can still operate normally under harsh conditions.

[0026] Preferably, the lithium battery pack further includes an identifier 211 disposed in the first groove 21, and there is a reserved gap between the identifier 211 and the breathable and waterproof membrane 221.

[0027] Specifically, identification element 211 is such as product identification or label, but this embodiment does not specifically limit this.

[0028] It is understandable that the breathable and waterproof membrane 221 has a relatively soft structure and is easily damaged by hard objects if exposed to the outside. Setting a marker 211 in the first groove 21 can protect the structure of the breathable and waterproof membrane 221, while the reserved gap can ensure the flow of air.

[0029] Preferably, the exhaust groove 24, which connects the second groove 22 to the outside, has two configuration options: Option 1: As Figure 2 As shown, an exhaust vent 24 communicating with the outside is provided between the bottom of the second groove 22 and the first groove 21, and a reserved gap exists between the marker 211 and the inner wall of the first groove 21. That is, one end of the exhaust vent 24 is connected to the first groove 21, and the other end extends from the bottom of the first groove 21 to the junction with the groove wall. Since there is a gap between the marker 211 and the inner wall of the first groove 21, at least a portion of the exhaust vent 24 extends beyond the coverage area of ​​the marker 211 and communicates with the outside.

[0030] Option 2: An exhaust groove 24, communicating with the outside, is provided between the inner walls of the second groove 22 and the first groove 21. That is, one end of the exhaust groove 24 connects to the first groove 21, and the other end extends through the bottom of the first groove 21 to the inner wall, and then extends upward along the inner wall to the top surface of the inner wall, communicating with the outside. In this case, there may or may not be a gap between the perimeter of the marking element 211 and the inner wall of the first groove 21.

[0031] It is understood that the extension path and direction of the exhaust groove 24 can be set according to the actual situation, and this embodiment does not make specific limitations on this.

[0032] Preferred, combined Figure 1 and Figure 4 As shown, the side wall end face of the aluminum alloy top cover 2 that covers the aluminum alloy shell 1 is provided with a mounting groove 25 for accommodating the sealing ring 252. The inner side wall of the mounting groove 25 is provided with a plurality of protrusions 251. The plurality of protrusions 251 extend into the aluminum alloy shell 1 and fit against the inner side wall of the aluminum alloy shell 1. The aluminum alloy top cover 2 and the aluminum alloy shell 1 are connected by a plurality of fasteners 26.

[0033] Specifically, after the sealing ring 252 is embedded in the mounting groove 25 of the aluminum alloy top cover 2, the aluminum alloy top cover 2 and the aluminum alloy shell 1 are closed together, and several fasteners 26 are passed through the corresponding connection holes of the aluminum alloy top cover 2, the sealing ring 252 and the aluminum alloy shell 1 in sequence to secure them, forming a box with good structural strength and sealing. The box is used to accommodate the battery cell module 3.

[0034] Understandably, the combination of the aluminum alloy top cover 2 and the aluminum alloy shell 1, through fasteners 26, forms a housing with high structural strength, good sealing, dustproof and waterproof properties, and flame retardancy, providing a reliable protective environment for the cell module 3 and improving the overall performance and safety of the lithium battery pack.

[0035] Specifically, fastener 26 is such as a fastening bolt, but this embodiment does not specifically limit it.

[0036] Specifically, the battery cell module 3 can be made of different types of battery cells in different series and parallel configurations according to actual needs.

[0037] Preferably, the battery cell module 3 is fixed to the inner wall of the aluminum alloy shell 1 by V0 flame-retardant foam, and the battery cell module 3 is fixed to the inner bottom surface of the aluminum alloy shell 1 by silicone.

[0038] Understandably, filling the space between the battery cell module 3 and the inner wall of the aluminum alloy casing 1 with V0 flame-retardant foam not only provides necessary support for the battery cell module 3, preventing it from shaking significantly during operation, but also absorbs and decomposes external forces in the event of a collision, thus protecting the battery cell module 3 from damage. Furthermore, the V0 flame-retardant foam can effectively prevent the spread of flames in the event of a fire, improving the safety of the battery system.

[0039] Furthermore, the cell module 3 is fixed to the inner bottom surface of the aluminum alloy casing 1 using silicone. Silicone has good adhesive strength and elasticity, maintaining stable performance under different temperature conditions. In addition, silicone also possesses excellent thermal conductivity, which helps to evenly distribute and dissipate heat from the cell module 3 within the aluminum alloy casing 1 at high temperatures, preventing localized overheating and thus avoiding thermal runaway. At low temperatures, the thermal conductivity of silicone ensures uniform internal temperature of the cell module 3, preventing performance degradation of the lithium battery pack due to temperature differences.

[0040] Preferably, the lithium battery pack also includes a lithium battery management system 5 disposed inside the aluminum alloy casing 1, and an insulating component 4 is disposed between the lithium battery management system 5 and the cell module 3.

[0041] Understandably, the lithium battery management system 5 monitors and manages the operating status of the lithium battery pack to ensure its safety and performance. By installing an insulator 4 between the lithium battery management system 5 and the cell module 3, electrical isolation is ensured, preventing safety hazards caused by short circuits or other electrical problems.

[0042] Specifically, the lithium battery management system 5 is equipped with a pressure monitoring module. The pressure monitoring module monitors the real-time pressure changes inside the lithium battery pack during the charging and discharging process through a pressure sensor. When the real-time pressure exceeds the safety threshold, the lithium battery management system 5 can cut off the charging and discharging switch, thus preventing safety risks such as cell expansion and fire before they occur. This avoids the need for explosion-proof design in the lithium battery pack structure. Pressure balance inside the lithium battery pack can be achieved simply by setting the first through hole 222 and the breathable and waterproof membrane 221.

[0043] Preferably, the lithium battery pack also includes a 4G module 271 and a GPS module 272 disposed in the handle 27 of the aluminum alloy top cover 2, and an output connector 1 28 and an output connector 29 disposed in the aluminum alloy top cover 2, wherein a sealing ring 2 is disposed in the output connector 1 28 and the output connector 29.

[0044] Understandably, the GPS positioning module is used to locate the lithium battery pack, while the 4G module 271 is used for remote data transmission and upgrades. Meanwhile, the dual-connector output design increases the versatility and convenience of the lithium battery pack, allowing users to select different connector models based on their needs. This enables users to connect various devices through different interfaces, improving the battery's versatility and practicality.

[0045] Furthermore, lithium-ion battery packs can operate stably within a voltage range not exceeding 60V and offer a variety of capacity specifications ranging from 20Ah to 40Ah, enabling them to adapt to different application scenarios. This wide voltage platform not only improves battery flexibility but also enhances its compatibility with various devices.

[0046] Preferably, a third groove 23 is provided on the upper surface of the aluminum alloy cover 2, and a second identifier 231 is fixedly provided in the third groove 23, and the second identifier 231 does not protrude from the upper surface of the aluminum alloy cover 2.

[0047] Specifically, the identification component 231 can be a permanent product identification or label. The identification component 231 is equipped with a QR code and numerical and alphanumeric codes to meet the identification requirements of the new national standard 43854. It remains clear even under a high temperature test of 950℃ and can be used to trace product information during the use of lithium battery packs.

[0048] Understandably, since the second identification element 231 does not protrude from the upper surface of the aluminum alloy cover 2, it avoids wear and tear on the second identification element 231 during the use of the lithium battery pack, thus improving the service life of the second identification element 231.

[0049] Example 2: This utility model provides an electric bicycle, including a lithium battery pack.

[0050] It is understood that the electric bicycle in this embodiment has the same beneficial effects as the lithium battery pack, which will not be elaborated here.

[0051] It will be understood by those skilled in the art that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lithium battery pack, comprising a sealed aluminum alloy casing (1) and an aluminum alloy top cover (2), and a cell module (3) disposed within the internal space of the aluminum alloy casing (1), characterized in that, The upper surface of the aluminum alloy cover (2) is provided with a first groove (21), and the bottom of the first groove (21) is provided with two second grooves (22) for accommodating a breathable and waterproof membrane (221); one of the second grooves (22) is provided with a first through hole (222) that connects to the internal space of the aluminum alloy shell (1), and the other second groove (22) is provided with several second through holes (223) that connect to the internal space of the aluminum alloy shell (1); the lower surface of the cover is provided with a receiving groove (24) that communicates with the second through hole (223) for accommodating the alarm.

2. A lithium battery pack according to claim 1, characterized in that, The lithium battery pack also includes an identifier (211) disposed in the first groove (21), and there is a reserved gap between the identifier (211) and the breathable waterproof membrane (221).

3. A lithium battery pack according to claim 1, characterized in that, The side wall end face of the aluminum alloy top cover (2) that covers the aluminum alloy shell (1) is provided with an installation groove (25) for accommodating the sealing ring (252). The inner side wall of the installation groove (25) is provided with a plurality of protrusions (251). The plurality of protrusions (251) extend into the aluminum alloy shell (1) and fit against the inner side wall of the aluminum alloy shell (1). The aluminum alloy top cover (2) and the aluminum alloy shell (1) are connected by a plurality of fasteners (26).

4. A lithium battery pack according to claim 2, characterized in that, An exhaust vent (224) communicating with the outside is provided between the bottom of the second groove (22) and the first groove (21), and there is a reserved gap between the first marker (211) and the inner wall of the first groove (21).

5. A lithium battery pack according to claim 1, characterized in that, An exhaust groove (224) communicating with the outside is provided between the inner wall of the second groove (22) and the first groove (21).

6. A lithium battery pack according to claim 1, characterized in that, The battery cell module (3) is fixed to the inner wall of the aluminum alloy shell (1) by V0 flame-retardant foam, and the battery cell module (3) is fixed to the inner bottom surface of the aluminum alloy shell (1) by silicone.

7. A lithium battery pack according to claim 6, characterized in that, The lithium battery pack also includes a lithium battery management system (5) disposed in the internal space of the aluminum alloy shell (1), and an insulating component (4) is disposed between the lithium battery management system (5) and the cell module (3).

8. A lithium battery pack according to claim 1, characterized in that, The lithium battery pack also includes a 4G module (271) and a GPS module (272) disposed in the handle (27) of the aluminum alloy cover (2), and an output connector one (28) and an output connector two (29) disposed in the aluminum alloy cover (2), wherein a sealing ring two is disposed in the output connector one (28) and the output connector two (29).

9. A lithium battery pack according to claim 1, characterized in that, The upper surface of the aluminum alloy cover (2) is also provided with a third groove (23), and a second identifier (231) is fixedly provided in the third groove (23), and the second identifier (231) does not protrude from the upper surface of the aluminum alloy cover (2).

10. An electric bicycle, characterized in that, Includes the lithium battery pack according to any one of claims 1-9.

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