Battery pack

Abstract

The utility model provides a battery pack which comprises a buffer piece and a plurality of single batteries, and the single batteries are stacked to form a battery module; the buffer piece is positioned on the outer side surface of the single battery on the outermost side of the battery module, and / or the buffer piece is positioned between two adjacent single batteries; an accommodating cavity is formed in the surface, in contact with the single battery, of the buffer part, and when the single battery expands, the accommodating cavity is used for accommodating the expanded single battery part. According to the battery pack provided by the utility model, the expansion volume of the single batteries after expansion can be effectively controlled in the battery pack, and the single batteries do not protrude out of the battery pack, so that the safety problems that the shell is punctured due to excessive expansion caused by heat production of the single batteries, other components of the battery pack are damaged, explosion and fire are caused and the like are solved; stable operation of the battery pack is ensured, and the overall safety performance of the battery pack is improved. The safety problems of expansion and explosion of single batteries and the like caused by unsmooth heat conduction after heat generation in the use process of the battery pack in the prior art are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery manufacturing, and particularly relates to a battery pack. Background Art

[0002] The existing battery pack is formed by connecting multiple single cells in series or in parallel and then encapsulating them in a metal shell. During the use of the battery pack, if overcharging or overheating occurs, a large amount of heat will accumulate inside the battery. If the heat is not dissipated in time, the electrolyte inside the battery pack may undergo oxidative decomposition to generate gas. These gases will cause the internal pressure of the battery to increase, resulting in battery expansion. The adjacent single cells may come into contact and rub against each other due to expansion, which easily causes battery explosion and poses a great safety hazard. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a battery pack for solving the safety problems such as the expansion of single cells and battery explosion caused by poor heat conduction after heat generation during the use of the existing battery pack.

[0004] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0005] Provide a battery pack, including a buffer member and a plurality of single cells, and the plurality of single cells are stacked to form a battery module;

[0006] The buffer member is located on the outer side surface of the single cell on the outermost side of the battery module, and / or the buffer member is located between two adjacent single cells;

[0007] A receiving cavity is provided on the surface of the buffer member in contact with the single cell. When the single cell expands, the receiving cavity is used to receive the expanded part of the single cell.

[0008] Optionally, the buffer member includes a silica gel frame, and a hollow part communicating with both side surfaces of the silica gel frame is provided in the middle of the silica gel frame. The receiving cavity is formed by the hollow part. The silica gel frame is arranged between two adjacent single cells, and both side surfaces of the silica gel frame are respectively abutted against the side surfaces of the two adjacent single cells.

[0009] Optionally, the silica gel frame is a rectangular frame structural member.

[0010] Optionally, the buffer member includes a plastic part, and the plastic part is a rectangular plate-shaped structural member. The plastic part is located on the outer side surface of the single cell on the outermost side of the battery module, and a groove is provided on the surface of the plastic part facing the single cell. The receiving cavity is formed by the groove.

[0011] Optionally, the thickness of the silica gel frame is 1.0 mm to 2.0 mm.

[0012] Optionally, the thickness of the plastic part is 1.5 mm to 3.0 mm.

[0013] Optionally, it further includes an insulating sheet, and the insulating sheet is arranged on the side of the single battery away from the silica gel frame.

[0014] Optionally, the single battery further includes a nickel sheet and a PCB board, and the PCB board is connected to the nickel sheet.

[0015] Optionally, the single battery further includes an FPC board, and the FPC board is connected to the PCB board.

[0016] Optionally, the battery pack includes a low-pressure injection plastic body, and the low-pressure injection plastic body covers the battery module.

[0017] The battery pack provided by the present utility model includes a buffer member and a plurality of single batteries. The plurality of single batteries are stacked to form a battery module. A receiving cavity is provided on the surface of the buffer member in contact with the single battery. When the single battery expands, the receiving cavity provided on the buffer member can accommodate the expanded part of the single battery, reducing the extrusion of the battery pack caused by the expansion of the single battery, thereby protecting the integrity of the overall structure of the battery pack; that is, the battery pack provided by the present utility model can effectively control the expanded volume after the single battery expands within the battery pack without protruding from the battery pack, thereby avoiding safety problems such as the single battery generating heat and causing excessive bulging to pierce the housing, damaging other components of the battery pack, and explosion and fire, ensuring the stable operation of the battery pack, and improving the overall safety performance of the battery pack. Description of the Drawings

[0018] Figure 1 is the overall assembly structure diagram of the battery pack provided by an embodiment of the present utility model;

[0019] Figure 2 is the explosion diagram of the battery pack provided by an embodiment of the present utility model;

[0020] Figure 3 is Figure 1 the internal structure schematic diagram of the battery pack in

[0021] The reference numerals in the accompanying drawings of the specification are as follows:

[0022] 1. Single battery; 2. Silica gel frame; 21. Hollow part; 3. Plastic part; 31. Groove; 4. Insulating sheet; 5. Nickel sheet; 6. PCB board; 7. FPC board; 8. Low-pressure injection plastic body; 9. Battery pack. Detailed Embodiments

[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and 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 therefore should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0025] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0026] An embodiment of the present utility model provides a battery pack 9, which includes a buffer member and a plurality of single cells 1, and the plurality of single cells 1 are stacked to form a battery module;

[0027] The buffer member is located on the outer side surface of the single cell 1 at the outermost side of the battery module, and / or the buffer member is located between two adjacent single cells 1;

[0028] A receiving cavity is provided on the surface of the buffer member in contact with the single cell 1, and when the single cell 1 expands, the receiving cavity is used to receive the expanded part of the single cell 1.

[0029] It should be noted that during the use of single cells and battery packs, when overcharging or overheating occurs, a large amount of heat will accumulate inside the battery. Due to chemical reactions and the formation of the SEI film, gas will be generated inside the battery, resulting in an increase in air pressure, which is likely to cause the expansion and deformation of the battery case. In a battery pack or module, the expansion of one battery may exert pressure on other surrounding batteries, damaging the structural stability of the entire battery pack and even causing the structural framework of the module to be damaged. Severe expansion may lead to a reduction in battery safety, and in extreme cases, there may be risks such as battery rupture, fire, or even explosion.

[0030] The battery pack 9 provided by the present utility model includes a buffer member and a plurality of single cells 1. The plurality of single cells 1 are stacked to form a battery module. The surface of the buffer member in contact with the single cells 1 is provided with a receiving cavity. When the single cell 1 expands, the receiving cavity provided on the buffer member can receive the expanded part of the single cell 1, reducing the extrusion of the battery pack 9 caused by the expansion of the single cell 1, thereby protecting the integrity of the overall structure of the battery pack 9. That is, the battery pack 9 provided by the present utility model can effectively control the expanded volume after the expansion of the single cell 1 inside the battery pack 9 without protruding from the battery pack 9, thereby avoiding safety problems such as the heat generated by the single cell 1 causing excessive bulging and piercing the case, damaging other components of the battery pack 9, and explosion and fire, ensuring the stable operation of the battery pack 9, and improving the overall safety performance of the battery pack 9.

[0031] In an embodiment, the buffer member includes a silica gel frame 2. A hollow portion 21 communicating the two side surfaces of the silica gel frame 2 is provided in the middle of the silica gel frame 2. The receiving cavity is formed by the hollow portion 21. The silica gel frame 2 is disposed between two adjacent single cells 1, and the two side surfaces of the silica gel frame 2 are respectively abutted against the side surfaces of the two adjacent single cells 1.

[0032] Specifically, the hollow portion 21 communicating the two side surfaces of the silica gel frame 2 is provided in the middle position of the silica gel frame 2 as the receiving cavity, which functions to receive the expanded part of the single cell 1. In addition, the two side surfaces of the silica gel frame 2 are respectively abutted against the side surfaces of two adjacent single cells 1, which is beneficial to the close contact between the silica gel frame 2 and the adjacent single cells 1, and thus better receives the expanded part of the battery.

[0033] On the other hand, the creep effect of the silicone frame 2 itself can be utilized to relieve or eliminate the stress generated by battery expansion, thereby protecting the structural integrity of the battery pack 9; the silicone material of the silicone frame 2 can also serve as a heat insulation layer, which is beneficial to maintaining the temperature balance inside the battery pack 9 and preventing local overheating; the softness and elasticity of the silicone material enable it to tightly fill the tiny gaps that may occur during the installation of the battery pack 9, while providing a shock absorption and buffering function; the silicone frame 2 also has good electrical insulation performance, which helps to prevent internal short circuits in the battery pack 9 and ensure the use safety.

[0034] In one embodiment, the silicone frame 2 is a rectangular frame structural member.

[0035] Specifically, when the shape of the silicone frame 2 is the same as that of the single battery 1, it is helpful to give full play to the accommodating function of the hollow part 21. In this application, the single battery 1 is rectangular, so the silicone frame 2 is set as a rectangular frame structural member; specifically, the specific shape of the silicone frame 2 changes following the shape of the single battery 1 and can also be other special-shaped structures.

[0036] In one embodiment, the buffer member includes a plastic part 3. The plastic part 3 is a rectangular plate-shaped structural member. The plastic part 3 is located on the outer side surface of the outermost single battery 1 of the battery module. A groove 31 is provided on the surface of the plastic part 3 facing the single battery 1, and the accommodating cavity is formed by the groove 31.

[0037] Specifically, a groove 31 is provided on the plastic part 3. When the outermost single battery 1 of the battery module expands, the groove 31 can accommodate the expanded part of the single battery 1, avoiding the extrusion damage to the housing caused by the expansion of the outermost battery of the battery module, and at the same time controlling the expanded part inside the battery pack 9, which is beneficial to the stable operation of the battery pack 9.

[0038] In one embodiment, the thickness of the silicone frame 2 is 1.0 mm to 2.0 mm.

[0039] Specifically, since the hollow part 21 of the silicone frame 2 is attached to the single battery 1, when the single battery 1 expands, the bulged part of the battery can be accommodated by the hollow part 21 of the silicone frame 2, reducing the pressure on the housing of the battery pack 9. Therefore, the silicone frame 2 needs to have a corresponding thickness to provide the hollow part 21 to form the accommodating part after the expansion of the single battery 1.

[0040] Specifically, the thickness of the silicone frame 2 can be 1.0 mm, 1.3 mm, 1.5 mm, 1.7 mm or 2.0 mm.

[0041] In one embodiment, the thickness of the plastic part 3 is 1.5 mm to 3.0 mm.

[0042] Specifically, since the groove 31 needs to be correspondingly provided on the plastic part 3 to accommodate the expanded part of the single cell 1, the plastic part 3 is required to have an appropriate thickness, which can not only play an insulating role but also better control the expanded part after the battery expands within the groove 31 without protruding from the battery pack 9, thereby avoiding excessive bulging and piercing the housing of the battery pack 9 and damaging other components of the battery pack 9.

[0043] Specifically, the thickness of the plastic part 3 can be 1.0 mm, 1.3 mm, 1.5 mm, 1.7 mm, 2.0 mm, 2.5 mm or 3.0 mm.

[0044] In one embodiment, an insulating sheet 4 is further included, and the insulating sheet 4 is disposed on a side of the single cell 1 away from the silica gel frame 2.

[0045] Specifically, attaching the insulating sheet 4 on a side of the single cell 1 away from the silica gel frame 2 is beneficial to forming a good insulating surface between multiple single cells 1 and avoiding short - circuit problems caused by direct contact between the single cells 1.

[0046] In one embodiment, the material of the insulating sheet 4 includes PP material, PE material, or PET material.

[0047] Specifically, in addition to the PP material, PE material, or PET material, the material of the insulating sheet 4 can also be polyimide material or epoxy resin material, or other materials that can play an insulating role. In a preferred embodiment, the material of the insulating sheet 4 is selected from PET material. The PET material not only has good durability and tensile strength but also can withstand relatively high temperatures, which is also applicable when the internal temperature of the battery pack 9 is too high.

[0048] In one embodiment, the single cell 1 further includes pole ears, and the pole ears are led out from one end of the battery and protrude from the end of the single cell 1.

[0049] Specifically, the pole ears include a positive pole ear and a negative pole ear. The positive pole ear is used to connect the positive electrode of the single cell 1, and the negative pole ear is used to connect the negative electrode of the single cell 1. The current can be led out from the inside of the single cell 1 to other electronic components through the positive pole ear and the negative pole ear, reducing the connection impedance without reducing the battery energy density.

[0050] In one embodiment, the single cell 1 further includes a nickel sheet 5 and a PCB board 6, and the PCB board 6 is connected to the nickel sheet 5.

[0051] It should be noted that in an electronic device, the PCB board 6 needs to be electrically connected to other components or interfaces. At this time, the nickel sheet 5 is required as a carrier to construct a contact point to achieve a stable connection with the electronic device.

[0052] Specifically, after welding the PCB board 6 and the nickel sheet 5, it is beneficial to provide a stable metal contact point, thereby maintaining the performance and stability of the electronic device.

[0053] In one embodiment, the single battery 1 further includes an FPC board 7, and the FPC board 7 is connected to the PCB board 6.

[0054] Specifically, by connecting the FPC board 7 and the PCB board 6, the electrical connectivity between circuits can be achieved through the connection between the FPC board 7 and the PCB board 6, ensuring the normal and stable operation of the circuit, and contributing to the conduction and interconnection of electronic signals.

[0055] On the other hand, the FPC board is generally a flexible circuit board made of polyimide or polyester film, while the PCB board provides physical support to help electronic components maintain fixed positions and stable connections. Therefore, the connection between the FPC board 7 and the PCB board 6 is beneficial to the transmission of electrical signals between the circuit composed of flexible materials and the rigid circuit board, and thus better realizes the conduction and interconnection of electrical signals.

[0056] In one embodiment, the battery pack 9 includes a low-pressure injection molding colloid 8, and the low-pressure injection molding colloid 8 coats the battery module.

[0057] It should be noted that the low-pressure injection molding process is a process method that injects thermoplastic materials into a mold at a relatively low injection pressure and cures and forms. Usually, plastic materials are combined with electronic components or other parts to form an integrated assembly; during the low-pressure injection molding process, the skin or embedded materials are first placed in the mold, and then the molten plastic is injected into the closed mold cavity, and the injection molded product is obtained after curing and shaping.

[0058] Specifically, using the low-pressure injection molding colloid 8 to coat the battery module is beneficial to strengthening the integration between multiple single batteries 1, between the single battery 1 and other structural parts and the low-pressure injection molding colloid 8, improving the bonding strength, reducing the risk of detachment. Compared with the traditional glue coating process, the low-pressure injection molding process avoids the use of adhesives such as glue and reduces the processing procedures, saving production costs and promoting the improvement of production efficiency at the same time.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: It comprises a buffer and a plurality of single cells, wherein the plurality of single cells are stacked to form a battery module; The buffer member is located on the outer side of the outermost single battery of the battery module, and / or the buffer member is located between two adjacent single batteries; A surface of the buffer member in contact with the single battery is provided with an accommodating cavity. When the single battery expands, the accommodating cavity is used to accommodate the expanded portion of the single battery.

2. A battery pack according to claim 1, characterized in that: The buffer member includes a silicone frame, a hollow portion communicating with two side surfaces of the silicone frame is provided in the middle of the silicone frame, the accommodating cavity is formed by the hollow portion, the silicone frame is provided between two adjacent single cells, and the two side surfaces of the silicone frame respectively abut against the side surfaces of the two adjacent single cells.

3. A battery pack according to claim 2, characterized in that: The silica gel frame is a rectangular frame structure.

4. A battery pack according to claim 2, characterized in that: The thickness of the silica gel frame is 1.0 mm to 2.0 mm.

5. A battery pack according to claim 2, characterized in that: It also includes an insulating sheet, which is arranged on a side of the single battery away from the silicone frame.

6. A battery pack according to claim 1, characterized in that: The buffer member includes a plastic member, which is a rectangular plate-shaped structural member. The plastic member is located on the outer side of the outermost single cell of the battery module. A groove is provided on one side of the plastic member facing the single cell, and the accommodating cavity is formed by the groove.

7. A battery pack according to claim 6, characterized in that: The thickness of the plastic part is 1.5 mm to 3.0 mm.

8. A battery pack according to claim 1, characterized in that: The single cell further comprises a nickel sheet and a PCB board, and the PCB board is connected to the nickel sheet.

9. A battery pack according to claim 8, characterized in that: The single battery further includes an FPC board, and the FPC board is connected to the PCB board.

10. A battery pack according to claim 1, characterized in that: The battery pack includes a low-pressure injection molding colloid, and the low-pressure injection molding colloid covers the battery module.

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