Battery box bottom protection structure, battery box and battery pack

Abstract

The utility model discloses a battery box bottom protection structure, a battery box and a battery pack, the battery box bottom protection structure comprises a bottom protection plate and an adapter, the adapter comprises a connecting part and a column part, one end of the column part is fixed on the connecting part, the peripheral wall surface of the column part is a ridge-free surface part, and the bottom protection plate is fixed on the bottom protection plate. The other end of the column part is fixedly connected with the bottom protection plate, and the connecting part is fixedly connected with the liquid cooling plate. By optimizing the bottom protection structure of the battery box, the probability that the liquid cooling plate is scratched or even punctured can be reduced when the battery box is impacted by external force, and the reliability and the safety of a product can be improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery packs, in particular to a battery box bottom protection structure, a battery box and a battery pack. BACKGROUND

[0002] The bottom of the battery box of the battery pack is provided with a liquid cooling plate to dissipate heat of the battery cell installed in the battery box. In order to prevent the liquid cooling plate or the battery cell from being damaged when subjected to external force impact, the battery box is provided with a bottom protection plate at the bottom of the liquid cooling plate.

[0003] In the related art, a square adapter block is riveted to one side of the bottom protection plate facing the liquid cooling plate, the square adapter block is welded and fixed with the liquid cooling plate, and the bottom protection plate is connected with the liquid cooling plate through the adapter block. When subjected to external force impact, such as being hit or scraped at the bottom during driving of the vehicle, the weld joint between the square adapter block and the liquid cooling plate is prone to falling off, so that the square adapter block is prone to tilting or falling down and moving along the liquid cooling plate. During the tilting movement or falling down of the square adapter block, the edges of the square adapter block are prone to scratching or even puncturing the liquid cooling plate, resulting in liquid leakage, and thus the air tightness and insulation of the whole battery pack are lost.

[0004] Therefore, how to alleviate or at least partially overcome the above-mentioned defects is a technical problem that needs to be solved by those skilled in the art at present. UTILITY MODEL CONTENT

[0005] To solve the above technical problems, the application provides a battery box bottom protection structure, a battery box and a battery pack. By optimizing the battery box bottom protection structure, when subjected to external force impact (for example, bottom scraping condition), the probability of the liquid cooling plate being scratched or even punctured can be reduced, which is beneficial to improve the product reliability and safety.

[0006] The first aspect of the application provides a battery box bottom protection structure, which comprises a bottom protection plate and an adapter, the adapter comprises a connecting part and a column part, one end of the column part is fixed on the connecting part, the outer peripheral wall surface of the column part is a non-ribbed surface part, the other end of the column part is fixedly connected with the bottom protection plate, and the connecting part is fixedly connected with a liquid cooling plate.

[0007] In an implementable scheme, the battery box bottom protection structure further comprises an elastic sleeve, and the elastic sleeve is fixedly sleeved on the column part.

[0008] In an implementable scheme, the height of the elastic sleeve is consistent with the height of the column part.

[0009] In an implementable scheme, the elastic sleeve is in interference fit with the column part, and / or the elastic sleeve is fixedly glued with the column part.

[0010] In an implementable solution, the battery box bottom protection structure comprises a protection plate fixed to one side of the liquid cooling plate facing the bottom protection plate, and the protection plate is a plate made of a material with a breaking elongation of ≥50%.

[0011] In an implementable solution, the protection plate is a PC plate; and / or, the protection plate has a notch avoiding the connecting part.

[0012] In an implementable solution, the connecting part is fixedly connected to the liquid cooling plate by fasteners.

[0013] In an implementable solution, the connecting part is fixedly connected to a non-flow channel region of the liquid cooling plate.

[0014] In an implementable solution, the connecting part comprises a first plate part and a second plate part, and the column part is located between the first plate part and the second plate part, and the first plate part and the second plate part are fixedly connected to the liquid cooling plate by fasteners.

[0015] The second aspect of the present application provides a battery box comprising the battery box bottom protection structure according to any one of the preceding aspects.

[0016] The third aspect of the present application provides a battery pack comprising a battery box and a battery cell installed in the battery box, and the battery box is the battery box described above.

[0017] The battery box bottom protection structure provided by the embodiments of the present application can be applied to the battery box of a battery pack. The battery box bottom protection structure comprises a bottom protection plate arranged below the liquid cooling plate at the bottom of the battery box, and a connecting piece connects the bottom protection plate and the liquid cooling plate. The outer peripheral wall surface of the column part of the connecting piece is a non-angled surface part, i.e., the outer peripheral wall surface of the column part is a continuous smooth surface part enclosed in a ring shape. The outer peripheral wall surface of the column part has no convex edges or sharp edges. In this way, when the vehicle is in a bottom scraping condition, i.e., the bottom of the vehicle is hit or scraped during driving, the connecting piece tilts and moves along the liquid cooling plate under external force impact. The outer peripheral wall surface of the column part of the connecting piece contacts the liquid cooling plate. Since the outer peripheral wall surface of the column part is a non-angled surface part, the connecting piece is less likely to scratch the liquid cooling plate during tilting and moving, which can effectively reduce the risk of the connecting piece scratching or even piercing the liquid cooling plate to cause liquid leakage, thereby providing technical support for the safety and reliability of the battery box or the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 4 is a partial cross-sectional view of a battery box bottom protection structure according to an embodiment of the present application;

[0019] Figure 2 FIG. 5 is a partial structure view of a battery box bottom protection structure according to an embodiment of the present application with the bottom protection plate hidden;

[0020] Figure 3 For Figure 1 Structure diagram of the adapter;

[0021] Figure 4 For Figure 2 Exploded view of the adapter and the elastic sleeve;

[0022] Figure 5 For Figure 2 Partial sectional view of the battery box bottom protection structure shown in one angle;

[0023] Figure 6 For Figure 2 Partial sectional view of the battery box bottom protection structure shown in another angle.

[0024] Explanation of reference signs:

[0025] Bottom guard plate 10, liquid cooling plate 20, flow channel 21, non-flow channel area 22,

[0026] Adapter 30, connecting part 31, first plate part 311, second plate part 312, mounting hole 313, column part 32, outer peripheral wall surface 321, end surface 322, transition surface 323, threaded hole 324;

[0027] Elastic sleeve 40, protection plate 50, notch 51. DETAILED DESCRIPTION

[0028] In order to make the person skilled in the art better understand the scheme of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0029] The ordinal numbers such as first, second, etc. used herein are used to distinguish different parts with the same name, and do not represent a specific order or primary and secondary relationship, etc.

[0030] In this paper, the top (top) and bottom (bottom) are defined based on the normal use state of the battery box or battery pack installed on the vehicle, and the use of the orientation words top (top) and bottom (bottom) is only to express the clarity and convenience of the technical scheme, and does not constitute a limitation on the protection scope of the present application.

[0031] Please refer to Figures 1 to 3 , Figure 1 Partial sectional view of a battery box bottom protection structure provided by an embodiment of the present application; Figure 2 Partial structure diagram of a battery box bottom protection structure provided by an embodiment of the present application, with the bottom guard plate hidden; Figure 3 For Figure 1 Structure diagram of the adapter. The battery box bottom protection structure in the diagram is in an inverted state.

[0032] The battery box bottom protection structure provided by the embodiment is used for a battery box of a battery pack, the battery pack can be applied to a vehicle, is generally installed at the bottom of the vehicle, and can provide power for the vehicle.

[0033] The battery box bottom protection structure comprises a bottom guard plate 10 and an adapter 30, the adapter 30 comprises a connecting part 31 and a column part 32, one end of the column part 32 is fixed on the connecting part 31, the outer peripheral wall surface 321 of the column part 32 is a non-ribbed surface part, the other end of the column part 32 is fixedly connected with the bottom guard plate 10, and the connecting part 31 is fixedly connected with a liquid cooling plate 20 of the battery box.

[0034] By the above scheme, the outer peripheral wall surface 321 of the column part 32 of the adapter 30 is a non-ribbed surface part, that is, the outer peripheral wall surface 321 of the column part 32 is a continuous smooth surface part in a ring shape, and the outer peripheral wall surface 321 of the column part 32 has no convex or sharp edges, so that when the adapter 30 is tilted and moves along the liquid cooling plate 20 under the impact of external force in the case that the vehicle is scraped at the bottom, that is, the bottom of the vehicle is hit or scraped during driving, the outer peripheral wall surface 321 of the column part 32 of the adapter 30 is in contact with the liquid cooling plate 20, and since the outer peripheral wall surface 321 of the column part 32 is a non-ribbed surface part, the liquid cooling plate 20 is not easy to be scratched during the tilting and moving of the adapter 30, the risk that the adapter 30 scratches or even pierces the liquid cooling plate 20 to cause liquid leakage can be effectively reduced, and thus technical support is provided for the safety and reliability of the battery box or the battery pack.

[0035] The column part 32 of the adapter 30 can have various implementation manners, so that the outer peripheral wall surface 321 thereof is a non-ribbed surface part.

[0036] In some embodiments, the column part 32 of the adapter 30 can have a cylindrical structure, the cross section of the column part 32 is circular, and the outer peripheral wall surface 321 thereof is in the form of a continuous smooth arc surface.

[0037] In some embodiments, the column part 32 of the adapter 30 can have a circular truncated cone structure, the cross section of the column part 32 is also circular, and the radial dimension of the column part 32 gradually increases in the direction close to the connecting part 31. In the illustrated example, the column part 32 has a circular truncated cone structure.

[0038] In some embodiments, the column part 32 of the adapter 30 can have an elliptical cylindrical structure, and the cross section of the column part 32 is elliptical.

[0039] In addition to the column part 32 in the above regular shape, in some other embodiments, the column part 32 can also have an irregular column structure, as long as the outer peripheral wall surface 321 thereof has no convex or sharp edges and is a non-ribbed surface part.

[0040] The column portion 32 has an end surface 322 away from the connecting portion 31. In a specific implementation, the end surface 322 of the column portion 32 is connected with the outer peripheral wall surface 321 through a smooth transition surface 323. In this way, the connecting position between the end surface 322 and the outer peripheral wall surface 321 can be avoided from having a protruding or sharp edge, and the probability of scratching the liquid cooling plate 20 after the adapter 30 is tilted can be further reduced.

[0041] The transition surface 323 can be an outward convex arc surface structure.

[0042] In an implementation, the adapter 30 can be an integrally formed piece. In this way, the adapter 30 has better structural strength, which is conducive to improving the reliability of the connection between the bottom protective plate 10 and the liquid cooling plate 20.

[0043] In a specific implementation, the adapter 30 can be a metal adapter, which has high strength and is conducive to improving the reliability of the connection between the bottom protective plate 10 and the liquid cooling plate 20.

[0044] For example, the adapter 30 is formed by machining an aluminum block. The adapter 30 is made of aluminum, which can reduce the weight while ensuring the strength.

[0045] For reference Figure 4 , Figure 4 To Figure 2 is an exploded view of the adapter and the elastic sleeve.

[0046] In an implementation, the battery box bottom protection structure further includes an elastic sleeve 40, which is fixedly sleeved outside the column portion 32 of the adapter 30. Here, “fixedly sleeved” means that the elastic sleeve 40 is relatively fixed with the column portion of the adapter 30, and the connection is a sleeving or inserting connection. Specifically, the elastic sleeve 40 is sleeved outside the column portion 32 of the adapter 30, or in other words, the column portion 32 is inserted into the elastic sleeve 40.

[0047] After the adapter 30 is tilted due to external force impact, the elastic sleeve 40 fixedly sleeved outside the column portion 32 directly contacts the liquid cooling plate 20. Under the buffering action of the elastic sleeve 40, the impact on the liquid cooling plate 20 can be alleviated, and the elastic sleeve 40 has elasticity, which can avoid damaging or even scratching the liquid cooling plate 20.

[0048] The elastic sleeve 40 can be formed in the same shape as the column portion 32 of the adapter 30, and the inner peripheral wall of the elastic sleeve 40 can be tightly attached to the outer peripheral wall surface 321 of the column portion 32.

[0049] In some examples, the elastic sleeve 40 can be a rubber sleeve. In other examples, the elastic sleeve 40 can be made of latex or resin plastic, and the material of the elastic sleeve 40 only needs to have good elasticity and flexibility.

[0050] In practice, the height of the elastic sleeve 40 is the same as the height of the column portion 32 of the adapter 30. In this way, the elastic sleeve 40 can at least cover most of the outer peripheral wall 321 of the column portion 32, which can improve the protection of the liquid cooling plate 20 when subjected to external impact and further reduce the probability of the liquid cooling plate 20 being scratched.

[0051] It is understood that the height of the elastic sleeve 40 and the height of the column 32 are consistent, including the case where the two heights are the same, and the case where the two heights have a certain difference. The difference can be determined according to actual needs.

[0052] In some embodiments, the elastic sleeve 40 is interference-fitted with the post portion 32 of the adapter 30. Specifically, the elastic sleeve 40 can be tightly fitted around the post portion 32 using its own elasticity. This arrangement reduces the probability of the elastic sleeve 40 falling off the post portion 32, ensuring the reliability of the fit between the elastic sleeve 40 and the post portion 32.

[0053] In other embodiments, the elastic sleeve 40 can be fixed to the post portion 32 of the adapter 30 by adhesive bonding. This prevents the elastic sleeve 40 from falling off the post portion 32 and ensures the reliability of the fit between the elastic sleeve 40 and the post portion 32.

[0054] In some embodiments, the elastic sleeve 40 can be fixed to the post portion 32 of the adapter 30 by a combination of interference fit and adhesive bonding. This ensures a strong connection between the elastic sleeve 40 and the post portion 32.

[0055] When the elastic sleeve 40 and the column 32 are fixed by adhesive, structural adhesive can be selected, which can withstand a large load and has good aging resistance, fatigue resistance and corrosion resistance.

[0056] Please refer to this as well. Figure 5 and Figure 6 , Figure 5 for Figure 2 The diagram shows a partial cross-sectional view of the bottom protective structure of the battery box at one angle. Figure 6 for Figure 2 The diagram shows a partial cross-sectional view of the battery box bottom protective structure from another angle. The battery box bottom protective structure is also inverted in the diagram.

[0057] In one implementation, the bottom protective structure of the battery box further includes a protective plate 50, which can be fixed to the side of the liquid cooling plate 20 facing the bottom protective plate 10, that is, the protective plate 50 is fixed to the bottom surface of the liquid cooling plate 20. The protective plate 50 is a plate made of a material with a breaking elongation rate ≥ 50%.

[0058] Here, the breaking elongation refers to the ratio of the length of the elongation of the material sample to the original length when the material is broken under the action of external force, usually expressed in percentage, which is an important indicator of material ductility and plasticity. The greater the breaking elongation, the greater the deformation the material can undergo before breaking, the better the ductility and plasticity.

[0059] After the above setting, the protective plate 50 can play a protective role for the liquid cooling plate 20. During the process of being impacted and moved by external force, the adapter 30 directly contacts the protective plate 50, and because the breaking elongation of the material of the protective plate 50 is not less than 50%, the protective plate 50 can better resist deformation and will not easily crack when subjected to external force. It can effectively protect the liquid cooling plate 20 and effectively avoid the situation that the liquid cooling plate 20 is scratched, which is conducive to ensuring the air tightness of the battery pack.

[0060] For example, the protective plate 50 is a PC (Polycarbonate, Polycarbonate) plate. The protective plate 50 can also be made of other composite materials with good ductility and toughness.

[0061] For example, the protective plate 50 and the liquid cooling plate 20 can be fixed by adhesive bonding to avoid adverse effects of the connection method on the liquid cooling plate 20. Specifically, structural adhesive can be selected to improve the connection strength and reliability between the protective plate 50 and the liquid cooling plate 20.

[0062] In a specific implementation, the protective plate 50 has a notch 51 that avoids the connection part 31 of the adapter 30. As shown in Figure 5 and Figure 6 As shown, the notch 51 of the protective plate 50 is used to avoid the connection part 31 of the adapter 30 to ensure that the connection part 31 of the adapter 30 can be fixedly connected with the liquid cooling plate 20.

[0063] The shape and size of the notch 51 of the protective plate 50 and the connection part 31 of the adapter 30 are matched, and after assembly, the connection part 31 of the adapter 30 is embedded in the notch 51 of the protective plate 50.

[0064] In one implementation, the connection part 31 of the adapter 30 is fixedly connected with the liquid cooling plate 20 by a fastener. In this way, the welding method in the background art is avoided, and the problem of liquid leakage of the liquid cooling plate 20 caused by cracking of the weld on the liquid cooling plate 20 under the vehicle scraping condition is avoided.

[0065] In some embodiments, the connection part 31 of the adapter 30 can be fixedly connected with the liquid cooling plate 20 by riveting, i.e., the fastener is a rivet. The rivet connection occupies a smaller space, and the size of the connection part 31 can be avoided to be too large.

[0066] The liquid cooling plate 20 has flow channels 21 inside for the flow of cooling liquid. The liquid cooling plate 20 includes non-flow channel areas 22, which can be the areas between two adjacent flow channels 21. In applications, the connecting portion 31 of the adapter 30 is fixedly connected with the non-flow channel areas 22 of the liquid cooling plate 20. In this way, on the one hand, the connecting reliability of the connecting portion 31 and the liquid cooling plate 20 can be ensured, and on the other hand, the connection of the connecting portion 31 and the liquid cooling plate 20 can avoid adversely affecting the flow channels 21 and affecting the normal work of the liquid cooling plate 20.

[0067] In the case where the connecting portion 31 of the adapter 30 is riveted and fixed with the liquid cooling plate 20 by rivets, the connecting portion 31 can be correspondingly small in size, thereby occupying a smaller space of the non-flow channel areas 22 of the liquid cooling plate 20, which is conducive to the design of increasing the area of the flow channels 21 of the liquid cooling plate 20, and further conducive to improving the heat dissipation effect of the liquid cooling plate 20 on the battery cells in the battery box.

[0068] In other embodiments, the connecting portion 31 of the adapter 30 can also be fixedly connected with the liquid cooling plate 20 by screws or bolts and the like. The connecting position of the connecting portion 31 and the liquid cooling plate 20 is also located in the non-flow channel areas 22 of the liquid cooling plate 20.

[0069] In an implementation scheme, the connecting portion 31 of the adapter 30 includes a first plate portion 311 and a second plate portion 312, and the column portion 32 is located between the first plate portion 311 and the second plate portion 312. The first plate portion 311 and the second plate portion 312 are fixedly connected with the liquid cooling plate 20 by fasteners.

[0070] In this way, the two sides of the column portion 32 are fixed with the liquid cooling plate 20, which can increase the connection strength and fixing reliability between the adapter 30 and the liquid cooling plate 20.

[0071] In the illustrated example, the first plate portion 311 and the second plate portion 312 each have two mounting holes 313. The first plate portion 311 and the second plate portion 312 are fixedly connected with the liquid cooling plate 20 by two fasteners (such as the above-mentioned rivets), and the fixing effect is good.

[0072] In other embodiments, the number of mounting holes 313 on the first plate portion 311 and the second plate portion 312 for connecting with the liquid cooling plate 20 can be one or three or more, which can be determined according to the size of the first plate portion 311 and the second plate portion 312 and the installation requirements.

[0073] In other embodiments, the fastener fixedly connected with the liquid cooling plate 20 can also be formed as an integral structure with the connecting portion 31.

[0074] In the illustrated example, the connection portion 31 of the adapter 30 has a substantially rectangular shape as a whole, and the junctions of the two adjacent sides of the connection portion 31 are connected through rounded corners, which are relatively smooth or rounded, so that the connection portion 31 can avoid damaging the liquid cooling plate 20 when the adapter 30 is knocked down.

[0075] In an implementation, the column portion 32 of the adapter 30 is fixedly connected to the bottom guard plate 10 through a fastener.

[0076] In a specific implementation, the column portion 32 and the bottom guard plate 10 can be fixedly connected through a bolt, and the column portion 32 can be provided with a threaded hole 324, and the bolt can be threadedly connected to the threaded hole 324 of the column portion 32 through the bottom guard plate 10.

[0077] In other implementations, the column portion 32 and the bottom guard plate 10 can also be fixedly connected through riveting.

[0078] In a specific implementation, the bottom guard plate 10 and the liquid cooling plate 20 are connected through a plurality of adapters 30, and the number and arrangement of the adapters 30 can be determined according to application requirements.

[0079] The above battery box bottom protection structure provided by the present application does not need to improve the structure of the bottom guard plate 10, and the bottom guard plate 10 can still be made of an existing mold, so that the cost increase caused by the change of the bottom protection structure can be avoided.

[0080] In addition to the above battery box bottom protection structure, the present application also provides a battery box including the battery box bottom protection structure introduced in the above embodiments.

[0081] The present application also provides a battery pack including the battery box with the battery box bottom protection structure, and the battery box can be installed with battery cells, and the liquid cooling plate 20 at the bottom of the battery box is used for heat dissipation of the battery cells.

[0082] The battery pack can be applied to a vehicle as a power source of the vehicle.

[0083] The principles and implementation modes of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the method and core idea of the present application. It should be noted that those skilled in the art can make some improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A battery case bottom protection structure, characterized by, The bottom protection structure comprises a bottom protection plate and an adapter, the adapter comprises a connecting part and a column part, one end of the column part is fixed on the connecting part, the outer peripheral wall surface of the column part is a non-ribbed surface part, the other end of the column part is fixedly connected with the bottom protection plate, and the connecting part is fixedly connected with the liquid cooling plate.

2. The battery case bottom protection structure according to claim 1, characterized by, The bottom protection structure further comprises an elastic sleeve, which is fixedly sleeved on the column part.

3. The battery case bottom protection structure according to claim 2, characterized by, The height of the elastic sleeve is consistent with the height of the column part.

4. The battery case bottom protection structure according to claim 2, characterized by, The elastic sleeve is in interference fit with the column part, and / or the elastic sleeve is fixedly glued with the column part.

5. The battery case bottom protection structure according to claim 1, characterized by, The bottom protection structure comprises a protection plate, which is fixed on the side of the liquid cooling plate facing the bottom protection plate, and the protection plate is a plate made of a material with a breaking elongation of ≥50%.

6. The battery case bottom protection structure according to claim 5, characterized by, The protection plate is a PC plate, and / or the protection plate has a notch avoiding the connecting part.

7. The battery case bottom protection structure according to any one of claims 1 to 6, characterized by, The connecting part is fixedly connected with the liquid cooling plate by fasteners.

8. The battery case bottom protection structure according to any one of claims 1 to 6, characterized by, The connecting part is fixedly connected with the non-flow channel area of the liquid cooling plate.

9. The battery case bottom protection structure according to any one of claims 1 to 6, characterized by, The connecting part comprises a first plate part and a second plate part, the column part is located between the first plate part and the second plate part, and the first plate part and the second plate part are fixedly connected with the liquid cooling plate by fasteners.

10. A battery box characterized by The bottom protection structure comprises a bottom protection plate and an adapter, the adapter comprises a connecting part and a column part, one end of the column part is fixed on the connecting part, the outer peripheral wall surface of the column part is a non-ribbed surface part, the other end of the column part is fixedly connected with the bottom protection plate, and the connecting part is fixedly connected with the liquid cooling plate.

11. A battery pack, characterized by The bottom protection structure comprises a bottom protection plate and an adapter, the adapter comprises a connecting part and a column part, one end of the column part is fixed on the connecting part, the outer peripheral wall surface of the column part is a non-ribbed surface part, the other end of the column part is fixedly connected with the bottom protection plate, and the connecting part is fixedly connected with the liquid cooling plate.

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