Battery pack and electric device with same

Abstract

The utility model belongs to battery technical field provides a kind of battery pack and the electric device with it, wherein, battery pack includes: battery, including battery body and the pressure relief mechanism of setting at the bottom of battery body;Supporting plate is supported in the below of battery, and the first avoiding opening corresponding with pressure relief mechanism is provided on supporting plate;Insulating protective layer is set on the inner side wall of first avoiding opening to separate pressure relief mechanism and supporting plate, and insulating protective layer includes main part and underflap, main part is connected with the inner side wall of first avoiding opening, and underflap is connected with the bottom wall of supporting plate, wherein, the inner surface of insulating protective layer is spaced apart from the outer surface of pressure relief mechanism and has distance D1, underflap has length D2, and distance D1 and length D2 satisfy: 0.1≤D1 / D2≤0.35.The technical scheme of the application can effectively solve the problem of secondary thermal runaway risk after battery thermal runaway in related technology.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery pack and an electrical device having the same. Background Technology

[0002] In related technologies, by placing the electrical connection components and pressure relief mechanisms on different sides of the battery, such as placing the electrical connection components on the top of the battery and the pressure relief mechanism on the bottom of the battery, thermoelectric separation can be achieved, so that thermal runaway of the battery will not lead to electric diffusion phenomena such as arcing, short circuits, and insulation failure, thereby improving the safety of the battery.

[0003] For structures such as support plates that are positioned opposite the battery's pressure relief mechanism, it is necessary to open clearance openings corresponding to the pressure relief mechanism so that the battery can quickly release heat after runaway. Conductive particles ejected after battery runaway can easily accumulate at the clearance openings, causing the battery to become conductive with the support plate. Furthermore, the smoke generated by battery runaway can easily cause an electric arc when it comes into contact with the support plate, posing a risk of secondary thermal runaway. Utility Model Content

[0004] The main objective of this invention is to provide a battery pack and an electrical device having the same, in order to solve the problem of the risk of secondary thermal runaway after battery thermal runaway in related technologies.

[0005] To achieve the above objectives, according to one aspect of the present invention, a battery pack is provided, comprising: a battery, including a battery body and a pressure relief mechanism disposed at the bottom of the battery body; a support plate, supported below the battery, the support plate having a first clearance opening corresponding to the pressure relief mechanism; and an insulating protective layer disposed on the inner wall of the first clearance opening to separate the pressure relief mechanism and the support plate, the insulating protective layer including a main body and a lower flange, the main body being connected to the inner wall of the first clearance opening, and the lower flange being connected to the bottom wall of the support plate, wherein the inner surface of the insulating protective layer is spaced apart from the outer surface of the pressure relief mechanism by a distance D1, the lower flange having a length D2, and the distance D1 and the length D2 satisfying: 0.1≤D1 / D2≤0.35.

[0006] According to another aspect of the present invention, an electrical device is provided, including a battery pack, wherein the battery pack is the aforementioned battery pack.

[0007] By applying the technical solution of this utility model, the pressure relief mechanism can open when the internal pressure or temperature of the battery body rises abnormally, thereby releasing the internal pressure of the battery body. A first clearance opening is provided on the support plate, allowing gas generated during the pressure release process of the battery body to pass through and be discharged quickly, thus rapidly releasing the heat and pressure of the battery body. An insulating protective layer is provided on the inner wall of the first clearance opening and can separate the pressure relief mechanism and the support plate, preventing conductive particles and fumes ejected during the exhaust process from connecting the battery and the support plate, thereby effectively preventing secondary thermal runaway of the battery. Specifically, the main body of the insulating protective layer can protect the inner wall of the first clearance opening, and the lower flange of the insulating protective layer can protect the bottom wall of the support plate near the first clearance opening, improving the protective effect. Furthermore, the distance D1 and length D2 satisfy the above relationship, ensuring that the distance D1 is relatively short and the length D2 is relatively long, preventing the first clearance opening from being too large and affecting the support effect and other effects of the support plate. Therefore, the technical solution of this application can effectively solve the problem of the risk of secondary thermal runaway after battery thermal runaway in related technologies. Attached Figure Description

[0008] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0009] Figure 1 A cross-sectional schematic diagram of one embodiment of the battery pack according to the present invention is shown;

[0010] Figure 2 It shows Figure 1 A magnified view of point A on the battery pack;

[0011] Figure 3 A cross-sectional schematic diagram of a portion of the structure of a battery pack according to an embodiment of the present invention is shown;

[0012] Figure 4 A cross-sectional schematic diagram of a portion of the structure of a support plate according to an embodiment of the battery pack of the present invention is shown.

[0013] The above figures include the following reference numerals:

[0014] 10. Battery; 11. Battery body; 12. Pressure relief mechanism;

[0015] 20. Support plate; 21. First clearance opening; 22. Lowered step section;

[0016] 30. Insulating protective layer; 31. Main body; 321. Lower flange; 322. Upper flange; 33. Transition arc section;

[0017] 40. Adhesive layer; 41. Second clearance opening;

[0018] 50. Mounting frame; 51. Base plate; 52. Side plate. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0022] like Figure 1 and Figure 2As shown, this application provides a battery pack. An embodiment of the battery pack includes: a battery 10, a support plate 20, and an insulating protective layer 30. The battery 10 includes a battery body 11 and a pressure relief mechanism 12 disposed at the bottom of the battery body 11. The support plate 20 is supported below the battery 10 and has a first clearance opening 21 corresponding to the pressure relief mechanism 12. The insulating protective layer 30 is disposed on the inner wall of the first clearance opening 21 to separate the pressure relief mechanism 12 and the support plate 20. The insulating protective layer 30 includes a main body 31 and a lower flange 321. The main body 31 is connected to the inner wall of the first clearance opening 21, and the lower flange 321 is connected to the bottom wall of the support plate 20. The inner surface of the insulating protective layer 30 is spaced apart from the outer surface of the pressure relief mechanism 12 by a distance D1, and the lower flange 321 has a length D2. The distance D1 and the length D2 satisfy the condition: 0.1 ≤ D1 / D2 ≤ 0.35.

[0023] Applying the technical solution of this embodiment, the pressure relief mechanism 12 can open when the internal pressure or temperature of the battery body 11 rises abnormally, thereby releasing the internal pressure of the battery body 11. A first clearance opening 21 is provided on the support plate 20, allowing gas generated during the pressure release process of the battery body 11 to pass through and be discharged quickly, thus rapidly releasing the heat and pressure of the battery body 11. The insulating protective layer 30 is disposed on the inner wall of the first clearance opening 21 and can separate the pressure relief mechanism 12 and the support plate 20, preventing conductive particles and fumes ejected during the exhaust process from connecting the battery 10 and the support plate 20, thereby effectively preventing secondary thermal runaway of the battery 10. Specifically, the main body 31 of the insulating protective layer 30 can protect the inner wall of the first clearance opening 21, and the lower flange 321 of the insulating protective layer 30 can protect the bottom wall of the support plate 20 near the first clearance opening 21, improving the protective effect. Furthermore, the relationship between distance D1 and length D2, as described above, ensures that distance D1 is relatively short and length D2 is relatively long. This prevents the first clearance opening 21 from being too large and affecting the support effect and other effects of the support plate 20 (for example, when the support plate 20 is a heat exchange plate, it avoids affecting the heat exchange effect of the support plate 20). Therefore, the technical solution of this embodiment can effectively solve the problem of the risk of secondary thermal runaway after battery thermal runaway in related technologies.

[0024] Preferably, D1 / D2 can be 0.1, 0.15, 0.2, 0.25, 0.3 or 0.35.

[0025] Preferably, the insulating protective layer 30 is attached to the support plate 20. This arrangement ensures the stability of the connection between the insulating protective layer 30 and the support plate 20, thereby guaranteeing the barrier effect of the insulating protective layer 30. It should be noted that "the insulating protective layer 30 is attached to the inner wall of the first clearance opening 21" means that the insulating protective layer 30 is attached to and adhered to the inner wall of the first clearance opening 21, thereby fixing the insulating protective layer 30 relative to the support plate 20 and preventing it from detaching from the support plate 20, ensuring the tightness and stability of the connection between the two.

[0026] Specifically, in this embodiment, the pressure relief mechanism 12 is an explosion-proof valve.

[0027] like Figure 1 and Figure 2 As shown, the insulating protective layer 30 also includes an upward-curved edge 322, which is connected to the top wall of the support plate 20. The upward-curved edge 322 can protect the top wall of the support plate 20 near the first clearance opening 21, further improving the protective effect.

[0028] like Figure 1 and Figure 2 As shown, the battery pack also includes an adhesive layer 40 disposed between the battery 10 and the support plate 20. The adhesive layer 40 is disposed at a location on the support plate 20 other than where the insulating protective layer 30 is disposed, and the insulating protective layer 30 is connected to the adhesive layer 40. Connecting the battery 10 and the support plate 20 through the adhesive layer 40 ensures the stability of the overall battery pack structure. The connection between the insulating protective layer 30 and the adhesive layer 40 allows the insulating protective layer 30 and the adhesive layer 40 to provide comprehensive protection for the top surface of the support plate 20 and the inner wall of the first clearance opening 21, thereby effectively preventing secondary thermal runaway of the battery 10.

[0029] It should be noted that the above-mentioned "adhesive layer 40 is provided at a position other than the insulating protective layer 30 on the support plate 20" means that adhesive layer 40 is provided at all positions on the top wall of the support plate 20 where the insulating protective layer 30 is not provided, and a second clearance opening 41 is formed on the adhesive layer 40 at the position corresponding to the first clearance opening 21, which can prevent the adhesive layer 40 from obstructing the exhaust after thermal runaway of the battery 10.

[0030] like Figure 3 As shown, in one embodiment, the adhesive layer 40 and the insulating protective layer 30 are an integral structure. By forming the insulating protective layer 30 simultaneously with the adhesive layer 40, the molding steps of the insulating protective layer 30 can be simplified, and the installation cost of the insulating protective layer 30 can be reduced. Since the insulating protective layer 30 and the adhesive layer 40 are an integral structure, that is, the insulating protective layer 30 also has adhesive capabilities, the adhesion effect between the insulating protective layer 30 and the support plate 20 can be guaranteed.

[0031] Specifically, when assembling the battery 10 and the support plate 20, a specific mold can be used to allow the structural adhesive to flow and form a specified shape. Specifically, the specific mold may include a support base plate and a protrusion disposed on the support base plate. The support plate 20 is placed on the support base plate, and the protrusion is correspondingly disposed with and extends into the first clearance opening 21 on the support plate 20. The protrusion is supported below the pressure relief mechanism 12 of the battery 10 and raises the battery 10 relative to the support plate 20 by a certain height. The top of the protrusion is fitted with the bottom of the battery 10, and the outer sidewall of the protrusion is spaced apart from the inner sidewall of the first clearance opening 21. Then, structural adhesive is injected so that it flows between the battery 10 and the support plate 20, and between the protrusion and the sidewall of the first clearance opening 21. Furthermore, the upper surface of the support base plate has a recess surrounding the protrusion, allowing the structural adhesive to flow into the recess and form the lower flange 321 of the insulating protective layer 30. Specifically, the battery 10 and the support plate 20 are placed on a specific mold before the structural adhesive is poured in; alternatively, the support plate 20 is placed on the support base plate of the specific mold first, and then structural adhesive is applied to the upper surface of the support plate 20 before placing the battery 10. The structural adhesive is squeezed at the bottom of the battery 10 so that it spreads between the protrusion and the inner wall of the first clearance opening 21.

[0032] like Figure 2 As shown, the insulating protective layer 30 is an insulating coating sprayed onto the first clearance opening 21. Forming the insulating protective layer 30 by spraying has the advantage of high flexibility.

[0033] Specifically, during the processing of the insulating protective layer 30, a mask can be set on the support plate 20. The mask has a spray nozzle corresponding to the first clearance opening 21, and the spray nozzle is larger than the first clearance opening 21. Then, a high-temperature insulating coating is sprayed onto the mask to form the insulating protective layer 30. The high-temperature insulating coating can be a ceramic coating, an organosilicon coating, a polyimide coating, etc.

[0034] like Figure 4 As shown, in one embodiment, a recessed step portion 22 is provided on the top surface of the support plate 20. The recessed step portion 22 surrounds and communicates with the first clearance opening 21. The insulating protective layer 30 also includes an upper flange 322 connected to the main body portion 31, and the upper flange 322 is located within the recessed step portion 22. The recessed step portion 22 facilitates the flow of structural adhesive into it, thereby ensuring the bonding effect between the adhesive layer 40 formed after the structural adhesive solidifies and the upper flange 322.

[0035] Of course, such as Figure 2 and Figure 3As shown, the recessed step can be omitted from the top surface of the support plate 20, meaning the top surface of the support plate 20 is a planar structure. This simplifies the structure of the support plate 20 and makes it easier to process.

[0036] like Figure 2 As shown, a transition arc segment 33 is provided at the connection position between the main body 31 and the lower flange 321. The provision of the transition arc segment 33 can avoid the formation of sharp corners at the connection position between the main body 31 and the lower flange 321 that are easily damaged or detached by impacts, thus ensuring the protective effect on the support plate 20.

[0037] like Figure 2 As shown, the thickness T of the insulating protective layer 30 is greater than or equal to 0.2 mm and less than or equal to 1 mm. By controlling the thickness T of the insulating protective layer 30 within the above range, the protective effect of the insulating protective layer 30 on the support plate 20 can be guaranteed, and the excessive occupation of the space inside the first clearance opening 21 can be avoided, thus affecting the venting of the battery 10. Preferably, the thickness T can be 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, or 1 mm.

[0038] like Figure 2 As shown, the length D2 of the lower flange 321 satisfies: 5mm ≤ D2 ≤ 30mm. By controlling the length D2 of the lower flange 321 within the above range, the protective effect of the lower flange 321 on the support plate 20 can be guaranteed, while reducing the material cost of the insulating protective layer 30. Preferably, the length D2 can be 5mm, 10mm, 15mm, 20mm, 25mm, or 30mm.

[0039] like Figure 2 As shown, the distance D1 between the inner surface of the insulating protective layer 30 and the outer surface of the pressure relief mechanism 12 satisfies 0.5mm ≤ D1 ≤ 10mm. The insulating protective layer 30 surrounds the outer side of the pressure relief mechanism 12 and is spaced apart from its outer surface. This not only protects the support plate 20 but also prevents the insulating protective layer 30 from blocking the exhaust path of the battery 10, ensuring that heat and pressure from thermal runaway of the battery 10 can be quickly discharged. Furthermore, it prevents the first clearance opening 21 from being too large and affecting the support effect and other effects of the support plate 20 (for example, when the support plate 20 is a heat exchange plate, it avoids affecting the heat exchange effect of the support plate 20). Preferably, the distance D1 can be 0.5mm, 2mm, 3.5mm, 5mm, 6.5mm, 8mm, 9.5mm, or 10mm.

[0040] like Figure 2As shown, the distance D1 and length D2 further satisfy the following condition: 5.5mm ≤ D2 + D3 ≤ 40mm. By ensuring that the distance D1 and length D2 satisfy the above relationship, a sufficiently long protective length for the support plate 20 can be guaranteed. Preferably, D1 + D2 can be 5.5mm, 10mm, 14.5mm, 19mm, 23.5mm, 28mm, 32.5mm, 37mm, or 40mm.

[0041] like Figure 1 and Figure 2 As shown, the support plate 20 is a heat exchange plate, and the battery pack also includes a mounting frame 50. The mounting frame 50 includes a base plate 51 and side plates 52 surrounding the base plate 51. Both the battery 10 and the support plate 20 are located within the mounting frame 50. The support plate 20 and the base plate 51 are spaced apart with a gap G, where 2mm ≤ G ≤ 20mm. The support plate 20, as a heat exchange plate, enables heat exchange with the battery 10, allowing the battery 10 to operate at a suitable temperature. The mounting frame 50 forms the overall outer frame of the battery pack. By spaced the support plate 20 and the base plate 51 apart with a gap G within the aforementioned range, a sufficiently large flow area can be ensured for venting of the battery 10, while preventing the overall height of the battery pack from becoming excessive. Preferably, the gap G can be 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, or 20mm.

[0042] This application also provides an electrical device, an embodiment of which includes a battery pack, wherein the battery pack is the aforementioned battery pack. The aforementioned battery pack effectively solves the problem of the risk of secondary thermal runaway after battery thermal runaway in related technologies, and the electrical device having the aforementioned battery pack also has the aforementioned advantages.

[0043] Among them, the electrical device can be the vehicle, that is, the battery pack can be used to power the vehicle. At this time, the support plate 20 and the bottom plate 51 are set to correspond to the bottom of the vehicle. When the battery 10 experiences thermal runaway, high temperature and high pressure gas is sprayed downwards, thereby preventing the high temperature and high pressure gas from being sprayed into the passenger compartment and ensuring the safety of the vehicle.

[0044] In the description of this utility model, it should be understood that "multiple" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0045] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0046] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: The battery (10) includes a battery body (11) and a pressure relief mechanism (12) disposed at the bottom of the battery body (11); A support plate (20) is provided below the battery (10), and the support plate (20) is provided with a first clearance opening (21) corresponding to the pressure relief mechanism (12); An insulating protective layer (30) is disposed on the inner sidewall of the first clearance opening (21) to separate the pressure relief mechanism (12) and the support plate (20). The insulating protective layer (30) includes a main body (31) and a lower flange (321). The main body (31) is connected to the inner sidewall of the first clearance opening (21), and the lower flange (321) is connected to the bottom wall of the support plate (20). The inner surface of the insulating protective layer (30) is spaced apart from the outer surface of the pressure relief mechanism (12) by a distance D1, and the lower flange (321) has a length D2. The distance D1 and the length D2 satisfy the following condition: 0.1 ≤ D1 / D2 ≤ 0.

35.

2. The battery pack according to claim 1, characterized in that, The insulating protective layer (30) also includes an upper flange (322), which is connected to the top wall of the support plate (20).

3. The battery pack according to claim 1, characterized in that, The battery pack also includes an adhesive layer (40) disposed between the battery (10) and the support plate (20). The adhesive layer (40) is disposed at a position on the support plate (20) other than where the insulating protective layer (30) is disposed. The insulating protective layer (30) is connected to the adhesive layer (40).

4. The battery pack according to claim 3, characterized in that, The adhesive layer (40) and the insulating protective layer (30) are an integral structure.

5. The battery pack according to claim 3, characterized in that, The top surface of the support plate (20) is provided with a recessed step (22), the recessed step (22) surrounds the first clearance opening (21) and communicates with the first clearance opening (21), and the insulating protective layer (30) also includes an upper flange (322) connected to the main body (31), the upper flange (322) is located inside the recessed step (22).

6. The battery pack according to claim 1, characterized in that, The top surface of the support plate (20) is a planar structure.

7. The battery pack according to claim 1, characterized in that, The insulating protective layer (30) is an insulating coating sprayed onto the first clearance opening (21).

8. The battery pack according to any one of claims 1 to 7, characterized in that, The connection between the main body (31) and the lower flange (321) has a transition arc segment (33).

9. The battery pack according to any one of claims 1 to 7, characterized in that, The length D2 satisfies: 5mm≤D2≤30mm.

10. The battery pack according to any one of claims 1 to 7, characterized in that, The distance D1 satisfies: 0.5mm≤D1≤10mm.

11. The battery pack according to any one of claims 1 to 7, characterized in that, The distance D1 and the length D2 further satisfy the following condition: 5.5mm ≤ D1 + D2 ≤ 40mm.

12. The battery pack according to any one of claims 1 to 7, characterized in that, The thickness T of the insulating protective layer (30) is greater than or equal to 0.2 mm and less than or equal to 1 mm.

13. The battery pack according to any one of claims 1 to 7, characterized in that, The support plate (20) is a heat exchange plate. The battery pack also includes a mounting frame (50). The mounting frame (50) includes a base plate (51) and a side plate (52) surrounding the outer periphery of the base plate (51). The battery (10) and the support plate (20) are both located within the mounting frame (50). The support plate (20) and the base plate (51) are spaced apart and have a gap G, where 2mm≤G≤20mm.

14. An electrical device comprising a battery pack, characterized in that, The battery pack is the battery pack according to any one of claims 1 to 13.

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