Lower shell and battery pack with same

Abstract

The utility model provides a lower shell and its battery pack, the lower shell is used for the battery pack, the lower shell comprises: a plurality of boundary beams, the plurality of boundary beams are connected in order to form a rectangular frame, the boundary beams are steel parts, the boundary beams comprise a plurality of side plates, the plurality of side plates are connected in order to form a ring shape, the adjacent side plates are in arc connection, and the side plates are arranged in the rectangular frame. And the radiuses of the inner fillets of the adjacent side plates are at least greater than or equal to the thickness of the side plates. According to the lower shell disclosed by the utility model, the radiuses of the inner fillets of the adjacent side plates are limited, so that the edge beam of the steel part can be normally processed, the structural strength of the edge beam is ensured, and meanwhile, the production cost of the battery pack can be reduced by the edge beam of the steel part.

Description

Technical Field

[0001] This utility model relates to the field of battery pack manufacturing technology, and in particular to a lower housing and a battery pack having the same. Background Technology

[0002] In existing battery pack designs, the lower casing is typically made of aluminum profiles through stamping to ensure structural strength. However, this manufacturing method is costly, increasing the overall production cost of the battery pack and thus failing to effectively reduce the manufacturing cost. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a lower housing that can reduce the manufacturing cost of a battery pack.

[0004] This application also proposes a battery pack having the aforementioned lower casing.

[0005] According to an embodiment of the present invention, a lower housing is used for a battery pack. The lower housing includes: a plurality of side beams, which are sequentially connected to form a rectangular frame. The side beams are made of steel and include a plurality of side plates, which are sequentially connected to form a ring. Adjacent side plates are connected by arcs, and the radius of the inner rounded corner of adjacent side plates is at least greater than or equal to the thickness of the side plate.

[0006] According to the lower shell of this utility model, by limiting the radius of the inner rounded corners of adjacent side plates, it is possible to ensure that the side beams of the steel parts can be processed normally and to ensure the structural strength of the side beams. At the same time, the side beams of the steel parts can also reduce the production cost of the battery pack.

[0007] According to some embodiments of the present invention, the thickness of the side plate is in the range of 1mm-1.5mm, and / or the radius of the outer rounded corner of the adjacent side plate is at least greater than or equal to 1.5 times the thickness of the side plate.

[0008] According to some optional embodiments of the present invention, one of the side plates forms a first side plate, the first side plate is provided with a fixing hole, and the lower housing further includes a fixing member, the fixing member passing through the fixing hole and adapted to fix the upper housing of the battery pack to the lower housing.

[0009] According to some optional embodiments of the present invention, one end of the fastener has an abutment portion, the abutment portion abuts against the periphery of the fixing hole, and the distance between the edge of the abutment portion and the outer radius of the side beam is greater than or equal to 2.5 mm.

[0010] According to some optional embodiments of the present invention, the lower housing includes: a sealing member disposed on the upper surface of the side beam, the sealing member extending in an annular shape along the rectangular frame, and the sealing member being fixed to the side beam.

[0011] According to some optional embodiments of the present invention, the sealing width of the seal is at least greater than or equal to 8 mm.

[0012] According to some embodiments of the present invention, the width of the side beam is at least greater than or equal to the first thickness, the first thickness being three times the thickness of the side plate, the width of the abutment portion, and the sealing width of the sealing element.

[0013] According to some embodiments of the present invention, the lower housing includes a cold plate and a connector, wherein the cold plate is connected to the lower side of the side beam via the connector.

[0014] According to some optional embodiments of the present invention, the lower housing includes an adhesive member disposed between the cold plate and the side beam.

[0015] A battery pack according to a second aspect of the present invention includes an upper housing and a lower housing according to a first aspect of the present invention, wherein the upper housing and the lower housing are connected.

[0016] According to the battery pack of this utility model, by setting the lower shell of the first aspect embodiment above and limiting the radius of the inner rounded corners of the adjacent side plates, it is possible to ensure that the side beams of the steel parts can be processed normally and to ensure the structural strength of the side beams. At the same time, the side beams of the steel parts can also reduce the production cost of the battery pack.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the lower housing at one angle according to an embodiment of the present utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of the lower housing from another angle;

[0020] Figure 3 It is along Figure 2 Sectional view of line AA in the middle;

[0021] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0022] Figure 5 yes Figure 1A schematic diagram of the lower housing at another angle;

[0023] Figure 6 It is along Figure 5 A cross-sectional view of the CC line;

[0024] Figure 7 yes Figure 6 A magnified view of a section at point D;

[0025] Figure 8 yes Figure 7 A schematic diagram of the connectors and adhesives in the diagram.

[0026] Figure label:

[0027] 100. Lower casing;

[0028] 10. Side beam; 11. Side plate; 111. First side plate; 112. Fixing hole; 12. Inner fillet; 13. Outer fillet;

[0029] 20. Fastener; 21. Abutment part;

[0030] 30. Sealing components;

[0031] 40. Cold-rolled steel plate;

[0032] 50. Connectors;

[0033] 60. Adhesive components. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0035] The following is a reference appendix. Figure 1-8 The lower housing 100 according to an embodiment of the present utility model is described.

[0036] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4According to an embodiment of the present utility model, the lower housing 100 is used for a battery pack. The lower housing 100 includes a plurality of side beams 10, that is, the lower housing 100 may include three, four, or five or more side beams 10. The plurality of side beams 10 are connected sequentially to form a rectangular frame. The side beams 10 are rolled and formed from steel parts. The side beams 10 include a plurality of side plates 11, that is, the side beams 10 may include three, four, or five or more side plates 11. Adjacent side plates 11 are connected by arcs, and the radius of the inner round corner 12 of adjacent side plates 11 is at least greater than or equal to the thickness of the side plate 11.

[0037] For example, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the lower shell 100 includes four side beams 10, which are connected end to end to form a ring-shaped rectangular frame. Each side beam 10 is rolled to form a rectangular ring structure, and adjacent side plates 11 are connected by arcs.

[0038] Since the side beam 10 is made of steel by roll forming, the radius of the inner round corner 12 of the adjacent side plate 11 needs to be limited due to the limited radius of the steel part during the roll forming process. This can prevent the side beam 10 from breaking at the corner due to the small radius of the inner round corner 12.

[0039] The lower housing 100 of this utility model limits the radius of the inner rounded corner 12 of the adjacent side plates 11, which can ensure that the steel side beam 10 can be processed normally. At the same time, it can ensure the structural strength of the side beam 10 and effectively prevent the side beam 10 from being damaged. Furthermore, compared with the prior art of using aluminum to make the lower housing 10, the steel side beam 10 of this application can effectively reduce the production cost of the battery pack, thereby reducing the manufacturing cost of the vehicle.

[0040] According to the embodiment of the present invention, the lower housing 100 limits the radius of the inner fillet 12 of the adjacent side plates 11, which can ensure that the steel side beam 10 can be processed normally and ensure the structural strength of the side beam 10. At the same time, the steel side beam 10 can also reduce the production cost of the battery pack.

[0041] According to some embodiments of this utility model, refer to Figure 3 and Figure 4 The thickness of the side plate 11 is in the range of 1mm-1.5mm. This ensures the strength of the side plate 11, thereby ensuring the structural strength of the edge beam 10.

[0042] For example, such as Figure 3 and Figure 4 As shown, the thickness of the side plate 11 can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm.

[0043] Furthermore, such as Figure 3 and Figure 4 As shown, the radius of the outer fillet 13 of adjacent side plates 11 is at least 1.5 times the thickness of the side plate 11. This further ensures that the steel side beam 10 can be machined normally, while also ensuring the structural strength of the side beam 10 and effectively preventing damage to the side beam 10.

[0044] For example, such as Figure 3 and Figure 4 As shown, the radius of the outer fillet 13 of the adjacent side plate 11 is at least 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times or 2 times the thickness of the side plate 11.

[0045] According to some optional embodiments of the present invention, refer to Figure 3 and Figure 4 One of the side plates 11 forms a first side plate 111, and the first side plate 111 is provided with a fixing hole 112. The lower housing 100 also includes a fixing member 20, which passes through the fixing hole 112 and is adapted to fix the upper housing of the battery pack to the lower housing 100. Thus, the fixing hole 112 provided on the first side plate 111 facilitates the passage of the fixing member 20, thereby allowing the upper housing and the lower housing 100 to be assembled to form a complete battery pack.

[0046] For example, such as Figure 3 and Figure 4 As shown, the upper side plate 11 is formed as the first side plate 111, and a fixing hole 112 is formed on the first side plate 111 through the first side plate 111 in the vertical direction. The upper housing is located on the upper side of the lower housing 100, and the fixing member 20 passes through the fixing hole 112 from top to bottom to fix the upper housing and the lower housing 100.

[0047] According to some optional embodiments of the present invention, refer to Figure 3 and Figure 4 One end of the fastener 20 (e.g. Figure 4 The upper end of the fastener 20 shown has an abutment portion 21, which abuts against the periphery of the fixing hole 112. The distance between the edge of the abutment portion 21 and the outer radius 13 of the side beam 10 is greater than or equal to 2.5 mm. Therefore, by providing the abutment portion 21, a stable fit between the fastener 20 and the periphery of the fixing hole 112 can be ensured, thus preventing the fastener 20 from passing directly through the fixing hole 112, which would prevent the fastener 20 from effectively securing the upper and lower housings 100. Simultaneously, limiting the distance between the edge of the abutment portion 21 and the outer radius 13 of the side beam 10 ensures a sealing effect at the location of the fastener 20, thereby ensuring the sealing effect of the entire battery pack.

[0048] For example, such as Figure 3 and Figure 4 As shown, the upper end of the fastener 20 has an abutment portion 21, the lower surface of the abutment portion 21 abuts against the periphery of the fixing hole 112, and the distance between the edge of the abutment portion 21 and the outer radius 13 of the side beam 10 can be 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm or 3mm.

[0049] According to some embodiments of this utility model, refer to Figure 3 and Figure 4 The lower housing 100 includes a seal 30, which is disposed on the upper surface of the side beam 10 (e.g., Figure 4 As shown on the upper surface of the side beam 10, the sealing element 30 extends in a ring along the rectangular frame and is fixed to the side beam 10. Thus, the sealing element 30 is positioned appropriately, thereby sealing the upper housing and the lower housing 100, and ensuring the sealing effect of the battery pack.

[0050] For example, such as Figure 3 and Figure 4 As shown, the sealing element 30 extends in a ring along the sequentially connected side beams 10, and the sealing element 30 is disposed on the upper surface of the side beams 10. When the upper housing and the lower housing 100 are installed together, the sealing element 30 seals the space between the upper housing and the lower housing 100.

[0051] According to some optional embodiments of the present invention, refer to Figure 3 and Figure 4 The sealing width of the seal 30 is at least 8 mm. This limits the sealing width of the seal 30, thereby ensuring its sealing effect and thus guaranteeing the waterproof and dustproof performance of the battery pack. It also enables the battery pack to achieve an IPX8 waterproof rating and effectively protects the side beam 10 from corrosion.

[0052] For example, such as Figure 3 and Figure 4 As shown, the sealing width of the seal 30 can be 8mm, 9mm, 10mm, 11mm, 12mm or 13mm.

[0053] According to some embodiments of this utility model, refer to Figure 3 and Figure 4 The width of the side beam 10 is at least greater than or equal to the first thickness, which is three times the thickness of the side plate 11, the width of the abutment portion 21, and the sealing width of the seal 30. Therefore, to ensure that the side beam 10 can accommodate the fixing member 20 and meet the sealing requirements of the seal 30, the width of the side beam 10 is limited, thereby enabling the battery pack to meet the sealing requirements and ensuring the quality of the battery pack.

[0054] For example, such as Figure 3 and Figure 4As shown, the side beam 10 has two outer fillets 13, and the radius of each outer fillet 13 must be greater than or equal to 1.5 times the thickness of the side plate 11. Therefore, the first thickness should include three times the thickness of the side plate 11. Figure 4 In this context, d1 represents the sealing width of seal 30. Figure 4 In the middle, d2 represents the width of the abutment part 21 in the left-right direction.

[0055] According to some embodiments of this utility model, refer to Figure 5 , Figure 6 and Figure 7 The lower housing 100 includes: a cold plate 40 and a connector 50, the cold plate 40 being connected to the lower side of the side beam 10 (e.g., via the connector 50) through the connector 50. Figure 7 The lower side of the side beam 10 shown is connected. Thus, the cold plate 40 can cool the inside of the battery pack, thereby preventing thermal runaway caused by high temperature inside the battery pack. At the same time, the fastener 50 fixes the cold plate 40 to the side beam 10 in a simple and convenient way, thereby improving the assembly efficiency of the lower housing 100.

[0056] For example, such as Figure 5 , Figure 6 and Figure 7 As shown, the cold plate 40 is a rectangular plate, and the cold plate 40 closes the lower part of the annular frame formed by the four side beams 10, which facilitates the placement of the battery module. The connector 50 passes through the cold plate 40 and the lower side of the side beams 10 from bottom to top, thus completing the fixation of the cold plate 40 and the side beams 10.

[0057] According to some optional embodiments of the present invention, refer to Figure 6 and Figure 7 The battery pack includes an adhesive component 60 disposed between the cold plate 40 and the side beam 10. The adhesive component 60 strengthens the bond between the cold plate 40 and the side beam 10, effectively preventing separation. Simultaneously, the adhesive component 60 seals the connection between the connector 50 and the cold plate 40, further ensuring the sealing effect of the battery pack. Preferably, the adhesive component 60 is made of adhesive, which is readily available and easy to use, facilitating the bonding of the cold plate 40 and the side beam 10.

[0058] Preferably, such as Figure 8 As shown, the adhesive component 60 is a blind rivet. Blind rivets have a simple structure, low cost, and are easy to use in batches. At the same time, the adhesive component 60 is coated on the flange surface of the blind rivet, thereby ensuring the bonding effect of the adhesive component 60.

[0059] Furthermore, referring to Figure 6 , Figure 7 and Figure 8Due to the instability of the sealing of the blind rivet, the flange diameter of the blind rivet should be greater than or equal to 16mm, and the effective sealing width of the adhesive 60 should be greater than or equal to 5mm. This can ensure the sealing effect of the adhesive 60 at the connection of the cold plate 40, and at the same time, it can effectively protect the side beam 10 and prevent the side beam 10 from corrosion.

[0060] According to the battery pack of the second aspect embodiment of the present utility model, referring to... Figure 1 , Figure 2 and Figure 3 It includes: an upper housing and a lower housing 100 of the first aspect of this embodiment, wherein the upper housing and the lower housing 100 are connected.

[0061] According to the battery pack of the present invention, by setting the lower shell 100 of the first aspect embodiment above and limiting the radius of the inner rounded corner 12 of the adjacent side plates 11, the steel side beam 10 can be processed normally, the structural strength of the side beam 10 can be guaranteed, and the steel side beam 10 can also reduce the production cost of the battery pack.

[0062] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0064] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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, an electrical connection, or a communication 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0066] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A lower housing for a battery pack, characterized in that, include: Multiple side beams are connected sequentially to form a rectangular frame. The side beams are made of steel parts and are roll-formed. Each side beam includes multiple side plates. Adjacent side plates are connected by arcs, and the radius of the inner rounded corner of adjacent side plates is at least greater than or equal to the thickness of the side plate.

2. The lower housing according to claim 1, characterized in that, The thickness of the side plate is in the range of 1mm-1.5mm, and / or the radius of the outer fillet of adjacent side plates is at least greater than or equal to 1.5 times the thickness of the side plate.

3. The lower housing according to claim 2, characterized in that, One of the side plates forms a first side plate, and the first side plate has a fixing hole. The lower housing further includes a fixing member, which passes through the fixing hole and is adapted to fix the upper housing of the battery pack to the lower housing.

4. The lower housing according to claim 3, characterized in that, One end of the fastener has an abutment portion that abuts against the periphery of the fixing hole, and the distance between the edge of the abutment portion and the outer radius of the side beam is greater than or equal to 2.5 mm.

5. The lower housing according to claim 4, characterized in that, include: A sealing element is disposed on the upper surface of the side beam, the sealing element extends in a ring along the rectangular frame, and the sealing element is fixed to the side beam.

6. The lower housing according to claim 5, characterized in that, The sealing width of the seal is at least 8 mm.

7. The lower housing according to claim 5, characterized in that, The width of the side beam is at least greater than or equal to a first thickness, which is three times the thickness of the side plate, the width of the abutment portion, and the sealing width of the seal.

8. The lower housing according to claim 1, characterized in that, include: Cold plate and connector, the cold plate being connected to the underside of the side beam via the connector.

9. The lower housing according to claim 8, characterized in that, include: An adhesive component is disposed between the cold plate and the side beam.

10. A battery pack, characterized in that, It includes an upper housing and a lower housing as described in any one of claims 1-9, wherein the upper housing is connected to the lower housing.

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