Battery pack

Abstract

The utility model relates to a battery pack. The battery pack comprises battery monomers, a first shell, a second shell and a top cover, the second shell covers the first shell and forms a first accommodating cavity together with the first shell, and a battery monomer is arranged in the first accommodating cavity; the top cover is arranged on one side, deviating from the first shell, of the second shell, a second accommodating cavity is formed between the top cover and the second shell, a first electric connecting piece is arranged in the second accommodating cavity, one end of the first electric connecting piece is connected with the battery monomer, and the other end of the first electric connecting piece is externally connected with a wiring terminal. According to the battery pack, the top cover is additionally arranged on the outer side of the second shell to accommodate the first electric connecting piece, so that the battery monomers and the first electric connecting piece are independently mounted in different spaces. And when the first electric connecting piece is damaged, the damaged first electric connecting piece is directly replaced, so that the probability that external dust and other impurities enter the first accommodating cavity to generate adverse effects on the battery monomers is reduced, the service life of the battery pack is prolonged, and the self protection capability of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of lithium battery technology, and in particular to battery packs. Background Technology

[0002] With the widespread adoption of new energy vehicles, energy storage power stations, consumer electronics, and industrial equipment, battery packs are frequently exposed to outdoor humid, rainy, snowy, water-filled, or high-humidity environments (such as electric vehicle chassis, outdoor energy storage enclosures, and drones). The risks of moisture penetration and liquid immersion have increased significantly. Therefore, improving the protective performance of battery packs has become an urgent problem to be solved. Utility Model Content

[0003] Therefore, it is necessary to address the problem of poor protection in battery packs by providing a battery pack that offers good protection and extends the battery pack's lifespan.

[0004] A battery pack, comprising:

[0005] Battery cell;

[0006] First shell;

[0007] The second housing covers the first housing and together they form a first receiving cavity, in which the battery cell is disposed;

[0008] A top cover is provided on the side of the second housing opposite to the first housing. A second receiving cavity is formed between the top cover and the second housing. A first electrical connector is provided in the second receiving cavity. One end of the first electrical connector is connected to the battery cell, and the other end is used for connecting an external terminal.

[0009] In one embodiment, the battery pack further includes a second electrical connector, a portion of which is located within the first receiving cavity and connected to the battery cell, and another portion of which passes through the second housing and is detachably connected to the first electrical connector.

[0010] In one embodiment, the second electrical connector includes an electrical connector body and a connecting piece, the body being located within the first receiving cavity and connected to the battery cell, and the connecting piece passing through the second housing and being detachably connected to the first electrical connector.

[0011] In one embodiment, the second housing is provided with a slot for the connecting piece to pass through, and a sealing element is provided around the slot, the sealing element being located between the second housing and the first electrical connector.

[0012] In one embodiment, the seal is configured as an annular element, and the number of slots is plurality of such slots, all of which are projected onto the second housing and fall within the seal.

[0013] In one embodiment, the first electrical connector includes a plate and a terminal. The plate has a slot that communicates with the slot and holds the connecting piece. The terminal is used to connect an external wiring terminal.

[0014] In one embodiment, the top cover has an opening that connects the second receiving cavity to the outside and is positioned opposite to the terminal.

[0015] In one embodiment, the surface of the terminal is covered with a waterproof layer.

[0016] In one embodiment, the first housing and the second housing are connected by a welding process.

[0017] In one embodiment, the top cover and the second housing are detachably connected.

[0018] The aforementioned battery pack incorporates a top cover on the outside of the second housing to accommodate the first electrical connector, allowing for separate installation of the individual battery cells and the first electrical connector in distinct spaces. When the first electrical connector is damaged, it can be directly replaced, reducing the probability of external dust and other impurities entering the first accommodating cavity and adversely affecting the battery cells. This extends the battery pack's lifespan and enhances its overall protection. Attached Figure Description

[0019] Figure 1 A perspective view of a battery pack provided for some embodiments of this application.

[0020] Figure 2 A cross-sectional view of a battery pack provided for some embodiments of this application.

[0021] Figure 3 This is a schematic diagram of the hidden portion of the battery pack structure provided in some embodiments of this application.

[0022] Figure 4 This is a schematic diagram of the hidden portion of the battery pack structure provided in some embodiments of this application.

[0023] Figure 5 This is a schematic diagram of the hidden portion of the battery pack structure provided in some embodiments of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 10. Battery cell; 20. First housing; 30. Second housing; 31. Slot; 40. First receiving cavity; 50. Top cover; 51. Opening; 60. Second receiving cavity; 70. First electrical connector; 71. Plate; 72. Terminal; 80. Second electrical connector; 81. Body; 82. Connecting piece; 90. Sealing element; 100. Battery pack. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] Please see Figures 1 to 3 Some embodiments of this application provide a battery pack 100, which includes a battery cell 10, a first housing 20, a second housing 30, and a top cover 50. The second housing 30 covers the first housing 20 and together forms a first receiving cavity 40, in which the battery cell 10 is disposed. The top cover 50 is disposed on the side of the second housing 30 opposite to the first housing 20, and a second receiving cavity 60 is formed between the top cover 50 and the second housing 30. A first electrical connector 70 is disposed in the second receiving cavity 60, one end of which is connected to the battery cell 10, and the other end is used for connecting an external terminal 72.

[0033] The first housing 20, the second housing 30, and the top cover 50 can all be made of the same material. The first electrical connector 70 can supply power to external electrical appliances or charge the battery pack 100.

[0034] When assembling the battery pack 100, the individual battery cells 10 required for the battery pack 100 can first be assembled into a whole using components such as brackets. Then, this whole assembly is placed into the first receiving cavity 40, and the first housing 20 and the second housing 30 are closed to seal the first receiving cavity 40. Next, one end of the first electrical connector 70 can be passed through the second housing 30 to electrically connect with the individual battery cell 10. Finally, the top cover 50 is placed over the first electrical connector 70 and assembled with the second housing 30. Thus, the first electrical connector 70 is installed within the second receiving cavity 60 formed between the top cover 50 and the second housing 30. The end of the first electrical connector 70 furthest from the individual battery cell 10 can form an external terminal for connection to an external wiring terminal 72.

[0035] Thus, an additional top cover 50 is provided on the outside of the second housing 30 to accommodate the first electrical connector 70, thereby allowing the battery cell 10 and the first electrical connector 70 to be installed separately in different spaces. When the first electrical connector 70 is damaged, it can be directly replaced without opening the first receiving cavity 40 where the battery cell 10 is located. This reduces the probability of external dust and other impurities entering the first receiving cavity 40 and adversely affecting the battery cell 10, extends the service life of the battery pack 100, and improves the protection capability of the battery pack 100 itself.

[0036] like Figure 2 As shown, in some embodiments, the battery pack 100 further includes a second electrical connector 80. A portion of the second electrical connector 80 is located within the first receiving cavity 40 and is connected to the battery cell 10, while another portion of the second electrical connector 80 passes through the second housing 30 and is detachably connected to the first electrical connector 70.

[0037] This can be understood as the battery pack 100 and the first electrical connector 70 being connected via the second electrical connector 80. Both ends of the second electrical connector 80 can be connected to the battery cell 10 and the first electrical connector by welding.

[0038] The addition of a second electrical connector 80 between the battery pack 100 and the first electrical connector 70 reduces the difficulty of achieving electrical connection between the battery pack 100 and the first electrical connector 70, making it easier for users to assemble.

[0039] Specifically, such as Figure 4 As shown, in some embodiments, the second electrical connector 80 includes an electrically connected body 81 and a connecting piece 82. The body 81 is located in the first receiving cavity 40 and connected to the battery cell 10. The connecting piece 82 passes through the second housing 30 and is detachably connected to the first electrical connector 70.

[0040] For example, a PCBA board can be used as the body 81, and metal conductive sheets can be used as connecting pieces 82. The second housing 30 has through holes that communicate with and fit the connecting pieces 82. There are multiple metal conductive sheets, all of which can be disposed on the same side of the PCBA board and protrude towards the side where the top cover 50 is located. The PCBA board is electrically connected to all the battery cells 10 within the first receiving cavity 40 via cell connectors.

[0041] After placing the battery cell 10 and the PCBA board into the first receiving cavity 40, the second housing 30 is closed to the first housing 20, allowing the connecting piece 82 on the PCBA board to pass through the through hole in the second housing 30. This allows the connecting piece 82, passing through the second housing 30, to be connected to the first electrical connector 70. The connection method between the connecting piece 82 and the first electrical connector 70 can be, but is not limited to, snap-fit ​​or threaded connection.

[0042] This design simplifies the structure of the second electrical connector 80 and makes it easier to connect the second electrical connector 80 and the first electrical connector 70 together.

[0043] More specifically, such as Figure 5 As shown, in some embodiments, the second housing 30 is provided with a slot 31 for the connecting piece 82 to pass through, and a sealing element 90 is provided around the slot 31, the sealing element 90 being located between the second housing 30 and the first electrical connector 70.

[0044] The seal 90 can be made of materials such as rubber or silicone and manufactured using a secondary injection molding process to achieve a soft seal. The seal 90 is adapted to the shape of the slot 31. When the connecting piece 82 passes through the slot 31, the seal 90 can seal the gap between the slot 31 and the connecting piece 82, thereby reducing the risk of dust and other contaminants in the second receiving cavity 60 entering the first receiving cavity 40 through the gap and adversely affecting the battery cell 10. The seal 90 has a waterproof rating of IPX6-IPX7, significantly improving the protection capability for the battery cell 10.

[0045] Furthermore, in some embodiments, the seal 90 is constructed as an annular member with a plurality of slots 31, all of which have their orthographic projections on the second housing 30 falling within the seal 90.

[0046] For example, there are five slots 31, the number of which is equal to the number of connecting pieces 82, with one slot 31 for one connecting piece 82 to pass through. All slots 31 and connecting pieces 82 are located within the internal space enclosed by the seal 90. This simplifies the structure of the seal 90 and reduces the difficulty of manufacturing the seal 90 without affecting its sealing effect.

[0047] In some embodiments, the first electrical connector 70 includes a plate 71 and a terminal 72. The plate 71 is provided with a slot that communicates with the slot 31 and holds a connecting piece 82. The terminal 72 is used to connect an external wiring terminal 72.

[0048] The board body 71 can be constructed as a PCB board, on which a large number of electrical components and slots are provided. When the second electrical connector 80 is installed, the connecting piece 82 can pass through the slot 31 of the second housing 30 and the slot on the PCB board in sequence, and be locked in place by the slot. This realizes the conduction between the first electrical connector 70 and the second electrical connector 80. After connecting the terminal 72 on the PCB board to the external wiring terminal 72, the battery pack 100 can be used to supply power to external electrical appliances, or the battery pack 100 can be charged by an external power source.

[0049] The above configuration simplifies the structure of the first electrical connector 70 and reduces the difficulty of manufacturing the first electrical connector 70.

[0050] Furthermore, in some embodiments, the top cover 50 is provided with an opening 51, which connects the second receiving cavity 60 to the outside and is disposed opposite to the terminal 72.

[0051] After the first electrical connector 70 is installed in the second receiving cavity 60, most of the first electrical connector 70 is covered by the top cover 50. The top cover 50 has an opening 51 only in the part opposite to the terminal 72. The shape of the opening 51 is adapted to the terminal 72, so that the external wiring terminal 72 can pass through the opening 51 and connect to the terminal 72 on the PCB board.

[0052] In this way, by minimizing the size of the opening 51, the part of the first electrical connector 70 that comes into contact with the outside world is reduced, thereby reducing the probability that external impurities will enter the second receiving cavity 60 through the opening 51 and adversely affect the first electrical connector 70, thus improving the protection effect on the first electrical connector 70.

[0053] Furthermore, the surface of terminal 72 is covered with a waterproof layer.

[0054] The surface of terminal 72 can be coated with a waterproof adhesive to form a waterproof layer. When external water seeps into the second receiving cavity 60, it can provide a certain degree of waterproofing, reducing the probability of terminal 72 being damaged by moisture. In addition, the coated waterproof adhesive can also play a curing role, improving the connection stability between terminal 72 and PCB board.

[0055] In some embodiments, the first housing 20 and the second housing 30 are connected by a welding process.

[0056] For example, the first housing 20 and the second housing 30 can be welded together using processes such as ultrasonic welding, vibration friction welding, and hot plate welding. Taking ultrasonic welding as an example, it offers the following advantages: First, ultrasonic welding requires no auxiliary materials, avoiding secondary contamination. Second, ultrasonic welding provides high weld strength, reducing thermal stress damage and welding defects, thus improving product quality and reliability. Furthermore, its fast welding speed enables mass production, significantly improving production efficiency. Third, the weld strength of ultrasonic welding is high, reaching over 90% of the base material's strength, ensuring product durability and reliability. Finally, the weld seam of ultrasonic welding is smooth and aesthetically pleasing, enhancing the overall appearance of the product.

[0057] This configuration improves the connection stability and sealing between the first housing 20 and the second housing 30, and reduces the probability of external impurities entering the first receiving cavity 40 and thus affecting the battery cell 10.

[0058] In some embodiments, the top cover 50 and the second housing 30 are detachably connected.

[0059] The top cover 50 and the second housing 30 may be connected together by, but not limited to, snap-fit ​​or bolts. The reason for designing the top cover 50 and the second housing 30 as a detachable connection is to facilitate the replacement of the damaged first electrical connector 70 when it is damaged, which can reduce maintenance costs compared to replacing the entire battery pack 100.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery pack, characterized in that, include: Battery cell; First shell; The second housing covers the first housing and together they form a first receiving cavity, in which the battery cell is disposed; A top cover is provided on the side of the second housing opposite to the first housing. A second receiving cavity is formed between the top cover and the second housing. A first electrical connector is provided in the second receiving cavity. One end of the first electrical connector is connected to the battery cell, and the other end is used for connecting an external terminal.

2. The battery pack according to claim 1, characterized in that, The battery pack also includes a second electrical connector. A portion of the second electrical connector is located within the first receiving cavity and is connected to the battery cell. Another portion of the second electrical connector passes through the second housing and is detachably connected to the first electrical connector.

3. The battery pack according to claim 2, characterized in that, The second electrical connector includes an electrical connector body and a connecting piece. The body is located in the first receiving cavity and connected to the battery cell. The connecting piece passes through the second housing and is detachably connected to the first electrical connector.

4. The battery pack according to claim 3, characterized in that, The second housing has a slot for the connecting piece to pass through, and a sealing element is provided around the slot, the sealing element being located between the second housing and the first electrical connector.

5. The battery pack according to claim 4, characterized in that, The seal is constructed as a ring, and there are multiple slots, the orthographic projection of all the slots on the second housing falling within the seal.

6. The battery pack according to claim 4, characterized in that, The first electrical connector includes a plate and terminals. The plate has a slot that communicates with the slot and holds the connecting piece. The terminals are used for connecting external wiring terminals.

7. The battery pack according to claim 6, characterized in that, The top cover has an opening that connects the second receiving cavity to the outside and is positioned opposite to the terminal.

8. The battery pack according to claim 6, characterized in that, The surface of the terminal is covered with a waterproof layer.

9. The battery pack according to any one of claims 1 to 8, characterized in that, The first housing and the second housing are connected by a welding process.

10. The battery pack according to any one of claims 1 to 8, characterized in that, The top cover and the second housing are detachably connected.

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