Battery box and vehicle

Abstract

This utility model relates to the field of vehicle technology and discloses a battery box and carrier, including: a box body made of magnesium alloy; and a transition connector disposed on the box body for connecting to the carrier body. The standard electrode potential 'a' of the box body material is less than the standard electrode potential 'b' of the transition connector material, and the standard electrode potential 'b' of the transition connector material is less than the standard electrode potential 'c' of the carrier body material. By setting the transition connector on the box body, and the standard electrode potential of the transition connector being between the standard electrode potentials of the box body and the carrier body, a connection method of box body-transition connector-carrier body is formed, avoiding direct contact between the box body and the carrier body. This splits the high potential difference between the box body and the carrier body into two smaller potential differences, effectively reducing the potential difference at the interface and preventing damage to the magnesium alloy box body due to electrochemical corrosion.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, specifically to a battery box and carrier. Background Technology

[0002] With the rapid development of new energy vehicles, high-voltage batteries, as a core component of automobiles, have a significant impact on the overall vehicle performance due to their performance and weight.

[0003] Currently, high-voltage batteries in new energy vehicles generally use aluminum alloy casings, but their high density results in a large battery casing weight, which is not conducive to the overall vehicle lightweighting and affects the vehicle's range and energy consumption.

[0004] To further reduce the overall vehicle weight, some new energy vehicles are currently using magnesium alloy instead of aluminum alloy as the high-voltage battery housing material to meet the weight reduction requirements of high-voltage batteries.

[0005] However, because magnesium alloys are more chemically reactive than aluminum alloys, magnesium alloy enclosures are more prone to corrosion compared to aluminum alloy enclosures. Utility Model Content

[0006] This utility model provides a battery box and carrier to solve or improve the problem in related technologies where the high voltage battery of new energy vehicles uses a magnesium alloy box, which has a higher risk of electrochemical corrosion.

[0007] In a first aspect, this utility model provides a battery housing, comprising:

[0008] The enclosure body is made of magnesium alloy;

[0009] A transition connector is disposed on the housing body. The transition connector is used to connect with the vehicle body. The standard electrode potential a of the material of the housing body is less than the standard electrode potential b of the material of the transition connector, and the standard electrode potential b of the material of the transition connector is less than the standard electrode potential c of the material of the vehicle body.

[0010] In one alternative implementation, it further includes:

[0011] A connecting bracket, one end of which is connected to the transition connector, and the other end of which is used to connect to the vehicle body, wherein the standard electrode potential b of the material of the transition connector is less than the standard electrode potential d of the material of the connecting bracket.

[0012] In one optional embodiment, the number of transition connectors is at least two, each of the transition connectors is spaced apart circumferentially along the body of the housing, and the connecting bracket is provided in a one-to-one correspondence with the transition connector.

[0013] In one optional embodiment, one end of the connecting bracket is provided with a first mounting hole, and the transition connector is provided with a second mounting hole opposite to the first mounting hole. The first mounting hole and the second mounting hole are adapted to insert a first locking fastener.

[0014] And / or, the other end of the connecting bracket is provided with a third mounting hole, the third mounting hole being adapted to insert a second locking fastener, the second locking fastener being used to connect the vehicle body.

[0015] In one alternative embodiment, the transition connector is welded to the housing body.

[0016] In one alternative implementation, it further includes:

[0017] An equipotential bonding harness is used to connect the housing body to the vehicle body so that the potentials of the housing body and the vehicle body are equal.

[0018] The enclosure body is provided with a wire harness connection part. The surface of the equipotential wire harness that contacts the wire harness connection part is provided with an anti-corrosion coating. The standard electrode potential a of the material of the enclosure body is less than the standard electrode potential e of the material of the wire harness connection part, and the standard electrode potential e of the material of the wire harness connection part is less than the standard electrode potential g of the material of the anti-corrosion coating.

[0019] In one alternative embodiment, the housing body is provided with a groove, and the wire harness connector is embedded in the groove.

[0020] In one optional embodiment, one end of the equipotential harness is provided with a first connection terminal, the first connection terminal is connected to the harness connection part, and the surface of the first connection terminal in contact with the harness connection part is provided with the anti-corrosion coating.

[0021] And / or, the other end of the equipotential harness is provided with a second connection terminal, which is used to connect to the vehicle body.

[0022] In one alternative embodiment, the wire harness connector is welded to the housing body.

[0023] Secondly, this utility model also provides a carrier, including a battery box as described in any of the above claims.

[0024] The battery box provided by this utility model forms a connection between the battery box body, the transition connector, and the standard electrode potential of the transition connector is between the standard electrode potentials of the battery box body and the vehicle body. This avoids direct contact between the battery box body and the vehicle body, splits the high potential difference between the battery box body and the vehicle body into two smaller potential differences, thereby effectively reducing the potential difference between adjacent overlapping interfaces, avoiding damage to the magnesium alloy battery box body due to electrochemical corrosion, and facilitating the lightweight design of the entire vehicle. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a top view of the battery box body according to an embodiment of the present utility model;

[0027] Figure 2 This is a bottom view of the battery box body according to an embodiment of the present utility model;

[0028] Figure 3 This is one of the enlarged partial schematic diagrams of the transition connector in an embodiment of this utility model;

[0029] Figure 4 This is a second enlarged schematic diagram of the transition connector in an embodiment of this utility model;

[0030] Figure 5 This is a partially enlarged schematic diagram of the equipotential bonding wire harness in an embodiment of this utility model;

[0031] Figure 6 This is a partially enlarged schematic diagram of the first connecting terminal in an embodiment of the present invention;

[0032] Figure 7 This is a partial cross-sectional view of the groove in an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Housing body; 101. Groove; 2. Transition connector; 201. Second mounting hole; 202. Hollowed-out part; 3. Connecting bracket; 301. Third mounting hole; 4. First locking fastener; 5. Second locking fastener; 6. Equipotential bonding harness; 601. Anti-corrosion coating; 602. First connecting terminal; 603. Second connecting terminal; 7. Harness connection part; 8. Third locking fastener; 9. Fourth locking fastener; 10. Body sheet metal part; 11. First transition weld; 12. Second transition weld. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, 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 application according to the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] The following is combined Figures 1 to 7 This describes the battery box and carrier according to embodiments of the present utility model.

[0040] According to an embodiment of the present invention, a battery housing is provided, suitable for use in high-voltage battery housings of vehicles such as new energy vehicles. The battery housing includes a housing body 1 and a transition connector 2. Specifically, as... Figure 1 As shown, the battery housing 1 is made of magnesium alloy, which reduces battery weight, meets the lightweight design requirements of the vehicle, and increases the vehicle's driving range. The transition connector 2 is disposed on the battery housing 1, optionally, as... Figure 1 As shown, the transition connector 2 is fixed to the side wall of the box body 1. The transition connector 2 is used to connect with the vehicle body. Specifically, the vehicle body includes a subframe (not shown in the figure), and the transition connector 2 is used to connect the subframe. The standard electrode potential a of the material of the box body 1 is less than the standard electrode potential b of the material of the transition connector 2, and the standard electrode potential b of the material of the transition connector 2 is less than the standard electrode potential c of the material of the vehicle body.

[0041] Specifically, in practical applications, the main body of the vehicle is generally a steel structure, and the main body 1 is a magnesium alloy box. The standard electrode potentials of magnesium and steel relative to hydrogen are -2.37V and -0.44V, respectively, i.e., a is -2.37V and c is -0.44V. The standard electrode potential b of the material of the transition connector 2 is between a and c. Optionally, the transition connector 2 is made of aluminum alloy, and the standard electrode potential of aluminum relative to hydrogen is -1.66V, i.e., b is -1.66V. In this way, by setting an aluminum alloy transition connection area on the magnesium alloy box, a magnesium alloy-aluminum alloy-steel connection method is formed. The potential difference (1.93V) when magnesium alloy and steel overlap is split into two potential differences: the potential difference (0.71V) when magnesium alloy and aluminum alloy overlap and the potential difference (1.22V) when aluminum alloy and steel overlap. This solves the electrochemical corrosion problem when magnesium alloy and steel overlap directly, realizes the lightweight design of the high-voltage battery, and improves the overall vehicle range and energy consumption performance. Of course, in other embodiments, the material of the transition connector 2 includes, but is not limited to, aluminum alloy. Other materials with a similar potential to aluminum alloy and good corrosion resistance can also be used to replace aluminum alloy as the transition connection area. In addition, the transition connector 2 is provided with a hollow portion 202 to reduce weight.

[0042] It should be noted that the units of a, b, and c are the same. In related technologies, the standard electrode potential of metals such as magnesium, aluminum, and steel relative to hydrogen is obtained by forming a galvanic cell with the electrode of the metal to be tested and a standard hydrogen electrode, and measuring the electromotive force of the cell. The standard electrode potential is a physical quantity that measures the ability of a metal to gain or lose electrons in solution, with the standard hydrogen electrode as the reference (the potential is defined as 0V). By forming a galvanic cell with the electrode of the metal to be tested and the standard hydrogen electrode, and measuring the electromotive force of the cell (i.e., the potential difference between the two electrodes), the standard electrode potential of the metal to be tested can be determined. If the potential of the metal to be tested is higher than that of the hydrogen electrode, its standard electrode potential is positive; otherwise, it is negative.

[0043] This configuration, by setting a transition connector 2 on the housing body 1, with the standard electrode potential of the transition connector 2 between the standard electrode potentials of the housing body 1 and the vehicle body, forms a connection between the housing body 1, the transition connector 2, and the vehicle body. This avoids direct contact between the housing body 1 and the vehicle body, splits the high potential difference between the housing body 1 and the vehicle body into two smaller potential differences, thereby effectively reducing the potential difference at adjacent overlapping interfaces. This prevents damage to the magnesium alloy housing due to electrochemical corrosion and is beneficial for achieving lightweight design of the entire vehicle.

[0044] Optionally, in some embodiments of this utility model, such as Figure 3As shown, the battery housing also includes a connecting bracket 3. One end of the connecting bracket 3 is connected to the transition connector 2, and the other end of the connecting bracket 3 is used to connect to the main body of the carrier. The standard electrode potential b of the material of the transition connector 2 is less than the standard electrode potential d of the material of the connecting bracket 3. Optionally, the connecting bracket 3 is a steel profile sheet metal part, which is convenient for processing. It should be noted that the units of a, b, and d are the same.

[0045] With this configuration, the flexible design of the connecting bracket 3 can meet the structural characteristics and installation space requirements of different types of vehicles, improve the versatility and applicability of the battery box, and ensure that the standard electrode potential of the transition connector 2 is between the standard electrode potentials of the box body 1 and the connecting bracket 3, effectively avoiding direct contact between the box body 1 and the connecting bracket 3 to prevent electrochemical corrosion.

[0046] Optionally, in some embodiments of this utility model, such as Figure 1 As shown, the number of transition connectors 2 is at least two, with each transition connector 2 spaced apart circumferentially along the body 1, and the connecting brackets 3 corresponding one-to-one with the transition connectors 2. It should be noted that the number of transition connectors 2 can be determined specifically according to actual design requirements. For example, as... Figure 1 As shown, two transition connectors 2 are spaced apart on the side wall of the main body 1 of the battery box, and there are two corresponding connecting brackets 3. The two connecting brackets 3 correspond one-to-one with the two transition connectors 2 (one of the connecting brackets 3 is hidden in the figure). With this arrangement, a reliable connection is established between the battery box and the main body of the vehicle through multiple transition connectors 2 and connecting brackets 3, ensuring that the battery box can be stably installed on the vehicle.

[0047] Optionally, in some embodiments of this utility model, such as Figure 3 As shown, one end of the connecting bracket 3 is provided with a first mounting hole (not shown due to being obscured by the first locking fastener 4). Figure 4 As shown, the transition connector 2 is provided with a second mounting hole 201 opposite to the first mounting hole. The first mounting hole and the second mounting hole 201 are suitable for inserting a first locking fastener 4. Optionally, the first locking fastener 4 is a bolt, pin, rivet, etc. Taking a bolt as an example, in this embodiment, as... Figure 3 As shown, the bolts pass through the first mounting hole and the second mounting hole 201 in sequence, and are secured with nuts. This locks the transition connector 2 and the connecting bracket 3, facilitating connection and disassembly.

[0048] like Figure 4 As shown, the other end of the connecting bracket 3 is provided with a third mounting hole 301, which is suitable for inserting a second locking fastener 5. The second locking fastener 5 is used to connect to the vehicle body. Optionally, the second locking fastener 5 is a bolt, pin, rivet, etc., for connecting to the subframe. Taking a bolt as an example, in this embodiment, as... Figure 4 As shown, the bolts pass sequentially through the third mounting hole 301 on the connecting bracket 3 and the mounting hole on the subframe, and are secured with nuts. This locks the connecting bracket 3 and the subframe together, thereby achieving the installation and fixation of the battery box, which is convenient and quick to operate.

[0049] Optionally, in some embodiments of this utility model, the transition connector 2 is welded to the housing body 1. Specifically, as shown in the figure... Figure 4 As shown, the enclosure body 1 is welded with a transition connector 2 by processes such as arc welding or friction stir welding, forming a first transition weld 11. This arrangement improves the connection strength between the transition connector 2 and the enclosure body 1, while avoiding the introduction of other dissimilar metals into the magnesium alloy during the welding process to create a potential difference, thus preventing the magnesium alloy enclosure from being corroded.

[0050] Optionally, in some embodiments of this utility model, such as Figure 2 As shown, the battery housing also includes an equipotential bonding harness 6, which connects the housing body 1 to the vehicle body to ensure that the potentials of the housing body 1 and the vehicle body are equal. Specifically, as... Figure 5 As shown, the main body of the vehicle includes a body sheet metal part 10. The body sheet metal part 10 and the battery box body 1 are connected by an equipotential bonding harness 6, forming an electrical path between them to ensure that the battery box and the vehicle have the same potential. This effectively avoids electrostatic discharge caused by potential difference, achieves potential balance, reduces electromagnetic interference in the electrical system, and improves electromagnetic compatibility, which is of great significance for ensuring the safe operation of the battery box.

[0051] like Figure 6 As shown, the housing body 1 is provided with a wire harness connection part 7, and the surface of the equipotential wire harness 6 in contact with the wire harness connection part 7 is provided with an anti-corrosion plating layer 601. Optionally, the anti-corrosion plating layer 601 may include, but is not limited to, a nickel plating layer, thereby improving the corrosion resistance of the connection end of the equipotential wire harness 6 and extending its service life. The standard electrode potential a of the material of the housing body 1 is less than the standard electrode potential e of the material of the wire harness connection part 7, and the standard electrode potential e of the material of the wire harness connection part 7 is less than the standard electrode potential g of the material of the anti-corrosion plating layer 601. It should be noted that a, e, and g have the same unit.

[0052] Specifically, taking the example of setting a nickel plating layer at the connection end of the equipotential harness 6, the standard electrode potentials of magnesium and nickel relative to hydrogen are -2.37V and -0.25V, respectively, i.e., a is -2.37V and g is -0.25V. The standard electrode potential e of the material of the harness connection part 7 is between a and g. Optionally, the harness connection part 7 is made of aluminum alloy material, and the standard electrode potential of aluminum relative to hydrogen is -1.66V, i.e., e is -1.66V. In this way, by setting up an aluminum alloy wiring harness connection area on the magnesium alloy housing, a connection method of magnesium alloy-aluminum alloy-nickel plating is formed. The original potential difference (2.12V) when the magnesium alloy and the nickel plating overlap is split into two potential differences: the potential difference when the magnesium alloy and the aluminum alloy overlap (0.71V) and the potential difference when the aluminum alloy and the nickel plating overlap (1.41V). This effectively reduces the potential difference at the overlap interface, thereby solving the electrochemical corrosion problem when the magnesium alloy and the nickel plating overlap. This is conducive to the lightweight design of high-voltage batteries, improving the vehicle's range and reducing the vehicle's energy consumption.

[0053] This configuration eliminates the potential difference between the battery box body 1 and the vehicle body through the equipotential harness 6, improving the overall vehicle safety performance. Furthermore, by setting up the harness connection part 7 to form a transition area, it avoids direct contact between the magnesium alloy and the anti-corrosion coating 601, thus preventing electrochemical corrosion and providing a reliable guarantee for using magnesium alloy as the high-voltage battery box material.

[0054] Optionally, in some embodiments of this utility model, such as Figure 7 As shown, the main body 1 of the battery box has a groove 101, and the wiring harness connector 7 is embedded in the groove 101. This arrangement, by embedding the wiring harness connector 7 in the groove 101 of the main body 1, makes full use of the installation space of the main body 1, avoids the wiring harness connector 7 occupying additional external space, makes the battery box structure more compact, the connection between components tighter, improves the overall aesthetics, and helps enhance the product's market competitiveness.

[0055] Optionally, in some embodiments of this utility model, such as Figure 5 As shown, one end of the equipotential bonding harness 6 is provided with a first connecting terminal 602, which is connected to the harness connecting part 7, and as... Figure 6 As shown, the surface of the first connecting terminal 602 that contacts the wire harness connecting portion 7 is provided with an anti-corrosion coating 601. Figure 5As shown, the other end of the equipotential bonding harness 6 is provided with a second connecting terminal 603. The second connecting terminal 603 is used to connect to the vehicle body, specifically, the second connecting terminal 603 is connected to the vehicle body sheet metal part 10. Optionally, in practical applications, the first connecting terminal 602 is connected to the harness connection part 7 through a third fastener 8, specifically, the third fastener 8 is a bolt, pin, rivet, etc. The second connecting terminal 603 is connected to the vehicle body sheet metal part 10 through a fourth fastener 9, specifically, the fourth fastener 9 is a bolt, pin, rivet, etc.

[0056] With this configuration, the connecting terminals at both ends of the equipotential harness 6 are respectively locked to the harness transition area and the vehicle body, forming an equipotential connection between the high-voltage battery and the vehicle body. In addition, to prevent corrosion of the OT terminals of the equipotential harness 6, the surface of the second connecting terminal 603 is also nickel-plated.

[0057] Optionally, in some embodiments of this utility model, the wire harness connection portion 7 is welded to the housing body 1. Specifically, as shown... Figure 6 As shown, the wire harness connection 7 is welded to the housing body 1 using processes such as arc welding or friction stir welding, forming a second transition weld 12. This configuration improves the connection strength between the wire harness connection 7 and the housing body 1, while avoiding the introduction of other dissimilar metals into the magnesium alloy during the welding process to create a potential difference, thus preventing accelerated corrosion of the magnesium alloy housing.

[0058] According to an embodiment of the present invention, another aspect provides a vehicle including a battery housing as described in the various embodiments above. Optionally, the vehicle may be a vehicle, a low-altitude aircraft, or the like. The derivation process of this beneficial effect is largely similar to the derivation process of the beneficial effect of the battery housing described above, and therefore will not be repeated here.

[0059] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery case characterized by comprising: include: The box body (1) is made of magnesium alloy. A transition connector (2) is disposed on the housing body (1). The transition connector (2) is used to connect with the vehicle body. The standard electrode potential a of the material of the housing body (1) is less than the standard electrode potential b of the material of the transition connector (2), and the standard electrode potential b of the material of the transition connector (2) is less than the standard electrode potential c of the material of the vehicle body.

2. The battery pack of claim 1, wherein Also includes: A connecting bracket (3) is provided, one end of which is connected to the transition connector (2), and the other end of which is used to connect to the vehicle body. The standard electrode potential b of the material of the transition connector (2) is less than the standard electrode potential d of the material of the connecting bracket (3).

3. The battery pack of claim 2, wherein, The number of transition connectors (2) is at least two, and each transition connector (2) is arranged at intervals along the circumference of the box body (1), and the connecting bracket (3) is arranged in a one-to-one correspondence with the transition connector (2).

4. The battery pack of claim 2, wherein, One end of the connecting bracket (3) is provided with a first mounting hole, and the transition connector (2) is provided with a second mounting hole (201) opposite to the first mounting hole. The first mounting hole and the second mounting hole (201) are suitable for inserting the first locking fastener (4). And / or, the other end of the connecting bracket (3) is provided with a third mounting hole (301), the third mounting hole (301) being adapted to insert a second locking fastener (5), the second locking fastener (5) being used to connect the vehicle body.

5. The battery pack of claim 1, wherein, The transition connector (2) is welded to the housing body (1).

6. The battery pack according to any one of claims 1 to 5, characterized by, Also includes: An equipotential harness (6) is used to connect the housing body (1) to the vehicle body so that the potentials of the housing body (1) and the vehicle body are equal. The housing body (1) is provided with a wire harness connection part (7). The surface of the equipotential wire harness (6) that contacts the wire harness connection part (7) is provided with an anti-corrosion coating (601). The standard electrode potential a of the material of the housing body (1) is less than the standard electrode potential e of the material of the wire harness connection part (7), and the standard electrode potential e of the material of the wire harness connection part (7) is less than the standard electrode potential g of the material of the anti-corrosion coating (601).

7. The battery pack of claim 6, wherein, The housing body (1) is provided with a groove (101), and the wire harness connection part (7) is embedded in the groove (101).

8. The battery pack of claim 6, wherein, One end of the equipotential harness (6) is provided with a first connection terminal (602), the first connection terminal (602) is connected to the harness connection part (7), and the surface of the first connection terminal (602) in contact with the harness connection part (7) is provided with the anti-corrosion coating (601). And / or, the other end of the equipotential harness (6) is provided with a second connection terminal (603), which is used to connect the vehicle body.

9. The battery pack of claim 6, wherein, The wire harness connection part (7) is welded to the box body (1).

10. A carrier, characterized by Includes the battery housing as described in any one of claims 1 to 9.

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