Battery tray assembly, battery pack, vehicle

Abstract

The present invention provides a battery tray assembly (100), a battery pack, and a vehicle (1). The battery tray assembly (100) includes a tray (110) and a conductive member (130), the tray (110) forms a mounting space (110a) configured to accommodate a battery pack (200) and is insulated from the battery pack (200), the conductive member (130) is provided on the tray (110) and at least a portion of the conductive member (130) is located within the mounting space (110a), one end of the conductive member (130) is connected to a predetermined potential point, and the conductive member (130) is electrically connected to the mounting space (110a). When a conductive medium is not present in the mounting space (110a), the conductive member (130) provides a first potential signal between the battery pack (200) and a predetermined potential point, and when a conductive medium is present in the mounting space (110a), the conductive member (130) conducts electricity between the battery pack (200) and the predetermined potential point via the conductive medium to provide a second potential signal between the battery pack (200) and the predetermined potential point, and the first potential signal and the second potential signal indicate whether or not a conductive medium is present in the mounting space (110a).

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to Chinese Patent Application No. "2022102495145" filed by BD Company Limited on March 14, 2022, for the invention entitled "Battery Tray Assembly, Battery Pack, Vehicle," the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of vehicles, and more particularly to battery tray assemblies, battery packs, and vehicles. [Background technology]

[0003] In the prior art, battery pack trays are made of composite materials, which, like plastics, have good insulating properties and can provide good insulation protection during battery pack operation. However, if the battery pack body is poorly sealed, causing water to enter the pack, electrolyte leakage from the batteries, or condensed water generated inside the pack body and accumulating inside the tray, current leakage detectors cannot detect the presence of a conductive medium in the tray. If the electrolyte or water accumulation inside the tray immerses the battery pack for a long period of time, electrolysis will occur in the aluminum casing of the cells, seriously affecting the battery's service life. Furthermore, if the aluminum casing is electrolyzed to a certain extent, it will cause perforation and leakage of the battery's aluminum casing, ultimately resulting in a more serious safety hazard. Therefore, it is necessary to detect the presence of a conductive medium in the battery tray. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems in the prior art, and therefore, one object of the present application is to provide a battery tray assembly that is provided with a conductive member and that can timely warn a user of the presence of a conductive medium between the tray and the battery pack, thereby allowing the user to discover the presence of a conductive medium in time and avoiding a safety accident.

[0005] The present application further provides a battery pack having the above battery tray assembly.

[0006] The present application further provides a vehicle having the above battery pack.

[0007] The battery tray assembly according to the present application includes a tray and a conductive member, the tray forming a mounting space configured to accommodate a battery pack, and the tray being insulated from the battery pack, the conductive member being provided on the tray and at least a portion of which is located within the mounting space, one end of the conductive member being connected to a predetermined potential point, and when a conductive medium is not present in the mounting space, the conductive member providing a first potential signal between the battery pack and the predetermined potential point, and when a conductive medium is present in the mounting space, the conductive member conducting the battery pack and the predetermined potential point via the conductive medium to provide a second potential signal between the battery pack and the predetermined potential point, the first potential signal and the second potential signal indicating whether or not a conductive medium is present in the mounting space.

[0008] In the battery tray assembly of the present application, a conductive member is added as a detection point for the conductive medium. When a conductive medium is present inside the tray, a current path can be formed between the battery pack, the conductive medium, the conductive member, and a predetermined potential point. When the battery management system detects a change in the potential difference between the battery pack and the predetermined potential point in a timely manner, it can report a potential signal to the vehicle indicating the presence of a conductive medium in the mounting space. By using this battery tray assembly, problems such as battery leakage or the presence of water pools in the tray can be detected in a timely manner, resulting in a high level of safety.

[0009] The battery pack according to the present application includes a battery tray and a battery pack, the battery tray being configured as the battery tray assembly in the above-described embodiment, the battery pack being disposed in the mounting space, a first potential signal being generated between the battery pack and the predetermined potential point when a conductive medium is not present in the mounting space, and a second potential signal being generated between the battery pack and the predetermined potential point when a conductive medium is present in the mounting space, the first potential signal and the second potential signal indicating whether a conductive medium is present in the mounting space. Because the battery pack according to the present application includes the battery tray, leakage of electricity due to accumulation of water in the battery or leakage of electrolyte in the battery pack can be detected in a timely manner, thereby improving safety.

[0010] The vehicle of the present application includes the battery pack of the above embodiment, and since the vehicle of the present application is equipped with the battery pack of the above embodiment, the vehicle can warn of electrolyte leakage or puddles in the battery pack, allowing the user to discover them in a timely manner and avoid safety accidents.

[0011] Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram illustrating the principle of detecting a conductive medium by a battery tray assembly according to an embodiment of the present application. [Figure 2] FIG. 1 is an exploded view of a battery pack according to an embodiment of the present application. [Figure 3] 1 is a structural view of a tray according to an embodiment of the present invention; [Figure 4] FIG. 10 is a proportional diagram of the width of a cell and a conductive member according to an embodiment of the present application. [Figure 5] 10A and 10B are views showing the fitting of the conductive member and the tray according to the embodiment of the present application. [Figure 6] 1 is a cross-sectional view of an embodiment of the conductive fastener, conductive member, and lug after mating. [Figure 7] FIG. 2 is an enlarged view of a frame according to an embodiment of the present application. [Figure 8] 1 is a schematic diagram of a vehicle according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, the embodiments of the present application will be described in detail, and examples of the embodiments are shown in the drawings, and the same or similar reference numerals throughout indicate the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the drawings are merely illustrative and are intended to help interpret the present application, and should not be understood as limiting the present application.

[0014] A battery tray assembly 100 according to an embodiment of the present invention will be described below with reference to FIGS.

[0015] 2, the battery tray assembly 100 according to the present application includes a tray 110 and a conductive member 130. The tray 110 forms a mounting space 110a configured to accommodate the battery pack 200, and the tray 110 is insulated from the battery pack 200. The conductive member 130 is provided on the tray 110 and at least a portion of the conductive member 130 is located within the mounting space 110a. One end of the conductive member 130 is connected to a predetermined potential point. When no conductive medium is present within the mounting space 110a, the conductive member 130 provides a first potential signal between the battery pack 200 and the predetermined potential point. When a conductive medium is present within the mounting space 110a, the conductive member 130 conducts the battery pack 200 and the predetermined potential point via the conductive medium, providing a second potential signal between the battery pack 200 and the predetermined potential point. The first potential signal and the second potential signal indicate whether or not a conductive medium is present within the mounting space 110a. In addition, the predetermined potential point is generally located outside the mounting space 110a, the conductive member 130 may be provided on the tray 110, and the entire conductive member 130 may be provided within the mounting space 110a, with another conductive structure connected to one end of the conductive member 130, and the other conductive structure may connect the conductive member 130 to the predetermined potential point, or the conductive member 130 may be provided on the tray 110, with a part of the conductive member 130 provided within the mounting space 110a, and the other part of the conductive member 130 extending outside the mounting space 110a and connected to the predetermined potential point, and this is not limited here.

[0016] In some embodiments, the battery pack 200 is mounted on the tray 110, and a conductive member 130 is further mounted on the tray 110. The battery pack includes a battery management system that can detect a potential difference between the battery pack 200 and a predetermined potential point. The conductive member 130 is connected to the predetermined potential point, and the potentials of the conductive member 130 and the predetermined potential point are equal. Therefore, the battery management system can detect the potential difference between the battery pack 200 and the conductive member 130. The conductive medium allows current to flow. When the conductive medium is not present in the mounting space 110a, the connection between the battery pack 200 and the conductive member 130 is interrupted. The battery management system detects the potential difference between the battery pack 200 and the conductive member 130, i.e., the potential difference between the battery pack 200 and the predetermined potential point. This potential difference is the potential difference during normal battery operation, and the battery management system converts the potential difference during normal battery operation into a first potential signal. Note that the first potential signal may be a voltage signal of the potential difference or a voltage signal of an insulation resistor provided in the battery pack. If a conductive medium is present in the mounting space 110a, the conductive medium is located between the battery pack 200 and the tray 110, and the battery pack 200, the conductive medium, the conductive member 130, and the predetermined potential point together form a current path. In this case, the potential difference between the battery pack 200 and the conductive member 130 detected by the battery management system changes due to the presence of the conductive medium. This potential difference is the potential difference during a battery failure, and the battery management system converts the potential difference changed due to the battery failure into a second potential signal. By adding the conductive member 130 to a battery pack having a battery management system, the potential difference between the battery pack 200 and the predetermined potential point can be detected, thereby determining whether a conductive medium is present in the battery pack.

[0017] In some other embodiments, to ensure that the battery pack does not leak electricity during normal operation, the tray 110 and the assembled battery 200 are insulated from each other to break the circuit. The insulating tray 110 is provided with a conductive member 130 capable of conducting current to detect whether a conductive medium exists between the tray 110 and the assembled battery 200. When a conductive medium exists between the tray 110 and the assembled battery 200, a current flows between the assembled battery 200 and the conductive member 130, forming a potential difference between the assembled battery 200 and a predetermined potential point. The battery management system can detect the change in the potential difference and convert the changed potential difference into a second potential signal. When no conductive medium exists between the tray 110 and the assembled battery 200, a first potential signal exists between the assembled battery 200 and the predetermined potential point. The battery management system determines whether a conductive medium exists in the tray 110 based on the change between the first potential signal and the second potential signal, and reports related information to the vehicle to warn the user and avoid any safety accidents of the vehicle 1. The conductive medium may be electrolyte leaked from the battery pack, water that has seeped in from the outside due to poor sealing of the pack body, or condensed water generated inside the pack body, and the pool of water accumulated on the tray 110 contains conductive positive and negative ions or other media that can electrically connect the battery pack 200 and the conductive member 130.

[0018] The battery tray assembly 100 of the present application is provided with a conductive member 130 as a detection point for the conductive medium. When a conductive medium is present inside the tray 110, a current path can be formed between the battery pack 200, the conductive medium, the conductive member 130, and a predetermined potential point. When the battery management system detects a change in the potential difference between the battery pack 200 and the predetermined potential point in a timely manner, it can report a potential signal to the vehicle indicating the presence of a conductive medium in the mounting space 110a. By using the battery tray assembly 100, problems such as battery leakage or the presence of water accumulation in the tray 110 can be detected in a timely manner, resulting in a high level of safety.

[0019] In some embodiments of the present application, the material of the conductive member 130 is copper or aluminum, which is easy to process and has good conductivity.

[0020] In some embodiments of the present application, the predetermined potential point may be provided at any position on the tray 110 as long as a potential difference can be generated between the predetermined potential point and the battery pack 200 so that the battery management system can detect a change in the potential difference. Note that the predetermined potential point is generally located outside the mounting space 110a.

[0021] According to some embodiments of the present application, the predetermined potential point is configured as a vehicle ground. In some embodiments, the conductive member 130 is connected to the predetermined potential point, i.e., when the conductive member 130 is directly grounded and the battery operates normally, the first potential signal detected by the battery management system is the potential difference between the battery pack 200 and the vehicle ground. When a conductive medium is present in the battery tray, the second potential signal detected by the battery management system is the changed potential difference between the battery pack 200, the conductive medium, and the vehicle ground. In this case, the conductive member 130 functions as a ground member and is directly connected to the vehicle ground, thereby reducing the number of parts in the battery tray assembly 100.

[0022] According to some embodiments of the present application, the tray 110 includes a grounding member, which is grounded, and one end of the conductive member 130 is electrically connected to the grounding member. In some embodiments, the grounding member is grounded, the potential of the grounding member is zero, and the conductive member 130 is at the same potential as the vehicle ground via the grounding member. Similarly, when the battery operates normally, the first potential signal detected by the battery management system is the potential difference between the battery pack 200 and the vehicle ground. When a conductive medium is present in the battery tray, the second potential signal detected by the battery management system is the changed potential difference between the battery pack 200, the conductive medium, and the vehicle ground. In this case, the conductive member 130 is grounded via the grounding member.

[0023] 3 , a plurality of conductive members 130 are provided on both sides of the tray 110 along the first direction, the conductive members 130 being spaced apart along the second direction, and the first direction and the second direction are perpendicular to each other. In some embodiments, a plurality of conductive members 130 are provided, and the plurality of conductive members 130 are distributed spaced apart on both sides of the tray 110. When a conductive medium is present in the tray 110, the conductive medium flows as the vehicle moves. When the conductive medium flows between the conductive member 130 and the battery pack 200, the conductive medium completes a circuit between the battery pack 200 and a predetermined potential point, forming a potential difference. The battery management system detects the potential difference and converts it into a second potential signal. When there is a change between the first potential signal and the second potential signal, the battery management system uploads the signal to the vehicle, thereby notifying the user that a leakage current has occurred. The distributed plurality of conductive members 130 can improve the probability of detecting the conductive medium, thereby improving safety.

[0024] According to some embodiments of the present application, as shown in Figure 3, the plurality of conductive members 130 are arranged symmetrically in the second direction of the tray 110. In some embodiments, the plurality of conductive members 130 are arranged symmetrically, which provides an elegant design, is easy to process, and increases the probability of detecting the conductive medium, ensuring safety.

[0025] According to some embodiments of the present application, as shown in FIG. 3, the plurality of conductive members 130 include a first conductive member and a second conductive member spaced apart in the second direction of the tray 110. The length of the tray 110 along the second direction is S, the distance between the first conductive member and one end of the tray 110 is S1, the distance between the second conductive member and the other end of the tray 110 is S2, and 0.15 < S1 / S < 0.35, 0.15 < S2 / S < 0.35 are satisfied. In some embodiments, the length of the tray 110 along the second direction is S, the first conductive member and the second conductive member are arranged in order along the second direction of the tray 110, and the tray 110 may be divided into three parts in the second direction. The distance between the first conductive member and one end of the tray 110 is S1, S1 and S satisfy 0.15 < S1 / S < 0.35, the distance between the second conductive member and the other end of the tray 110 is S2, S2 and S satisfy 0.15 < S2 / S < 0.35. Since the distances for the conductive medium to reach the two conductive members are close, when the conductive medium flows in the tray 110, it can be easily detected that there is a conductive medium in the tray 110, increasing the detection probability. In some embodiments of the present application, in order to be able to detect the conductive medium present in the tray 110, the first conductive member and the second conductive member are respectively provided on both sides of the tray 110 in the second direction, and the first conductive member and the second conductive member may face the assembled battery 200.

[0026] In some embodiments of the present application, the thickness of the conductive member 130 is d, and d satisfies 0.1 mm < d < 2 mm, whereby it is easy to attach to the tray 110 and does not affect the thickness of the tray 110.

[0027] According to some embodiments of the present application, as shown in Fig. 2, the tray 110 includes a bottom plate 111 and a frame 112. The bottom plate 111 mounts the battery pack 200 and is configured as an insulating member, and the frame 112 is provided on the outer periphery of the bottom plate 111 and configured as a grounding member. In some embodiments, the bottom plate 111 of the tray 110 forms an installation space 110a for accommodating the battery pack 200, and the frame 112 is provided on the outer periphery of the bottom plate 111. The frame 112 is grounded and fixedly connected to the bottom plate 111. The frame 112 may be configured as a metal member, which improves the rigidity of the tray 110 and can be connected to the vehicle body via a grounding wire to achieve grounding.

[0028] According to some embodiments of the present application, as shown in FIG. 2 , the battery tray assembly 100 further includes a lug 120. The lug 120 is connected to the outer periphery of the frame 112 and configured as a grounding member, and the conductive member 130 is connected to the lug 120. In some embodiments, the lug 120 is provided on the outer periphery of the frame 112 and is provided with a fixing point that connects the battery tray to the vehicle body, and the conductive member 130 can establish electrical continuity between the lug 120 and the battery pack 200 when a conductive medium is present in the mounting space 110a. In some embodiments of the present application, the lug 120 is made of a metal material and can be connected to the potential of the vehicle to achieve grounding.

[0029] According to some embodiments of the present application, as shown in Figures 5 and 6, a protruding support protrusion 111a is formed on the outer periphery of the bottom plate 111, and the support protrusion 111a extends to the lug 120 so that the bottom plate 111 abuts against the lug 120, and a part of the conductive member 130 is provided within the mounting space 110a, and another part of the conductive member 130 is provided on the support protrusion 111a and is electrically connected to the lug 120. In some embodiments, the support protrusions 111a are made of an insulating material integrally molded with the tray 110 and protrude from the outer periphery of the bottom edge to facilitate connection between the lugs 120 and the bottom plate 111, and another portion of the conductive member 130 is provided on the support protrusions 111a, and the conductive member 130 is exposed on the surface of the support protrusions 111a. When the support protrusions 111a abut against the lugs 120, the portion of the conductive member 130 exposed on the support protrusions 111a comes into contact with the lugs 120 and is electrically connected, thereby grounding the conductive member 130.

[0030] In some embodiments of the present application, as shown in FIG. 6 , the conductive member 130 may be composed of a conductive sheet and a conductive bolt, a portion of the conductive sheet being located on the bottom plate 111, a portion of the conductive sheet being adjacent to or located within the mounting space 110a, and another portion of the conductive sheet extending to the support protrusion 111a, the conductive bolt penetrating the support protrusion 111a and pressed against the other portion of the conductive sheet, and then the conductive bolt being screwed into the lug 120, thereby grounding the conductive member 130. In some other embodiments of the present application, the conductive member 130 is configured as a conductive sheet, a part of the conductive sheet is located on the bottom plate 111 and adjacent to or within the mounting space 110a, and another part of the conductive sheet extends to the support protrusion 111a and is provided on the bottom wall surface of the support protrusion 111a, and when the support protrusion 111a abuts against the lug 120, the other part of the conductive sheet contacts the lug 120 to electrically connect the conductive member 130 and the lug 120 to achieve grounding.

[0031] 7, the bottom plate 111 includes a bottom plate body 1111, side plates 1112, and a flange portion 1113. The side plates 1112 are provided on the outer periphery of the bottom plate body 1111 and together with the bottom plate body 1111 define an assembly mounting space 110a for the battery pack. The flange portion 1113 is provided on the outer edge of the side plates 1112 and extends in a direction away from the assembly mounting space 110a. The flange portion 1113 has a support protrusion 111a formed thereon. In some embodiments, the side plate 1112 connects the bottom plate body 1111 and the flange portion 1113, the bottom plate body 1111 and the side plate 1112 defining the mounting space 110a, the flange portion 1113 extending along the outer edge of the side plate 1112 in a direction away from the mounting space 110a, a portion of the conductive member 130 being provided on the bottom plate body 1111, and another portion of the conductive member 130 extending along the side plate 1112 to the flange portion 1113 and contacting the support protrusion. This configuration of the bottom plate 111 facilitates placement of the battery and attachment of the conductive member 130.

[0032] 7 , the frame 112 includes a front beam 1123, a rear beam 1124, and side beams 1120. The front beam 1123 and the rear beam 1124 are fixed to the front and rear sides of the side beam 1120, respectively. The side beam 1120 is configured in two parts, each connected to the end of the front beam 1123 and the rear beam 1124 on the same side. The side beam 1120 includes an outer support portion 1121 and an inner support portion 1122. The outer support portion 1121 is configured to support the flange portion 1113. The height of the inner support portion 1122 is smaller than that of the outer support portion 1121. The inner support portion 1122 is located on the side of the outer support portion 1121 facing the mounting space 110a. The inner support portion 1122 is configured to support the bottom plate body 1111. In some embodiments, the front beam 1123 is provided on the front side of the bottom plate 111, the rear beam 1124 is provided on the outer periphery of the flange portion 1113 on the rear side of the bottom plate 111, and the outer support portion 1121 and inner support portion 1122 of the side beam 1120 are provided in order, the outer support portion 1121 supports the flange portion 1113 on the side of the bottom plate 111, and the inner support portion 1122 supports the bottom plate main body 1111, and the outer support portion 1121 is higher than the inner support portion 1122, forming a height difference between the flange portion 1113 and the bottom plate main body 1111, thereby defining the battery mounting space 110a. The provision of the inner support portion 1122 and the outer support portion 1121 can improve the load-bearing capacity of the bottom plate 111, increase the rigidity of the bottom plate 111, and prevent deformation of the bottom plate 111.

[0033] In some embodiments of the present application, the bottom plate 111 and the frame 112 are bonded together using a structural adhesive, and the dimensional tolerance of the frame 112 can be accommodated by controlling the thickness of the structural adhesive. In addition, the frame 112 has good flatness, and the structural adhesive's ability to accommodate dimensional tolerances can be utilized to reduce the manufacturing precision of the frame 112 and the bottom plate 111.

[0034] According to some embodiments of the present application, as shown in FIG. 7, a plurality of hollow cavities 1121a extending in the front-rear direction are formed inside the outer support portion 1121, and the side walls between two adjacent hollow cavities 1121a are provided in an inclined manner. In some embodiments, in order to reduce the weight of the frame 112, the interior of the outer support portion 1121 is set to have a plurality of adjacent cavities, that is, hollow cavities 1121a, and by inclining the side walls between two adjacent hollow cavities 1121a, the rigidity of the outer support portion 1121 is increased to avoid deformation of the frame 112 during a collision caused by an external force.

[0035] In some embodiments of the present application, as shown in FIG. 7, the inner side wall of the outer support portion 1121 divides the interior of the outer support portion 1121 into two regions. The cross-sectional area of the hollow cavity 1121a close to the inner support portion 1122 is S1, and the cross-section of the hollow cavity 1121a far from the inner support portion 1122 is trapezoidal and has a cross-sectional area of S2. In the power battery system, the cross-sectional area S1 of the hollow cavity 1121a provided close to the inner support portion 1122 has a great influence on the mode of the power battery pack. The larger S1 is, the worse the rigidity of the bottom plate 111 becomes, the lower the mode of the whole pack becomes, and the greater the probability of resonance occurrence. The cross-sectional area S2 of the hollow cavity 1121a provided far from the inner support portion 1122 has a great influence on the collision protection of the vehicle. The larger S2 is, the smaller the support area of the hollow cavity 1121a far from the inner support portion 1122 becomes, the smaller the energy that can be absorbed when the vehicle collides and an external force invades, and the greater the risk of collision safety. In order to balance the mode of the whole pack and the collision protection of the vehicle, S1 and S2 need to satisfy 0.80 < S1 / S2 < 0.99.

[0036] In some embodiments of the present application, as shown in FIG. 7, the cross section of the hollowed cavity 1121a adjacent to the inner support portion 1122 is triangular, and the two angles defined by the inner side wall of the outer support portion 1121 and the hollowed cavity 1121a are α and β, respectively, and both α and β have angles within the range of 50° to 70°, and are values ​​such that the cross section of the hollowed cavity 1121a is an isosceles triangle, thereby improving the stability of the cross section of the hollowed cavity 1121a.

[0037] 7, the bottom of the inner support part 1122 is provided with a plurality of support grooves 1122a extending in the front-rear direction and spaced apart in the width direction, and the support grooves 1122a are located below the bottom plate 111. In some embodiments, the support grooves 1122a can improve the load-bearing capacity of the inner support part 1122 so that the bottom plate 111 can withstand the pressure of the battery.

[0038] According to some embodiments of the present application, a water reservoir is formed in the inner support portion 1122. In some embodiments, the water reservoir is configured to temporarily store the conductive medium in the battery pack, and when the conductive medium appears inside the battery tray assembly 100, the conductive medium flows into the water reservoir and is temporarily stored therein. The water reservoir absorbs or discharges the conductive medium, thereby reducing the conductive medium inside the battery pack, reducing the risk of electric leakage inside the battery pack due to the conductive medium, and improving the safety of the battery pack.

[0039] 3 and 5, the conductive member 130 is integral with the bottom plate 111. In some embodiments, the conductive member 130 may be fitted into the bottom plate 111, with a portion of the conductive member 130 being the bottom wall of the mounting space 110a and another portion of the conductive member 130 extending from the bottom plate 111 and contacting the frame 112 for grounding. In some embodiments, the conductive member 130 may be thermocompressed to the bottom plate 111 using a hot press method to form a conductive path.

[0040] 5 and 6 , the portion of the tray 110 on which the battery pack 200 is placed is configured as an insulating member, and the battery tray assembly 100 further includes a conductive fastener 140. The conductive fastener 140 is configured as a grounding member, and fastens the tray 110 and the conductive member 130 together. In some embodiments, the conductive fastener 140 is electrically conductive, and the conductive member 130 and the conductive fastener 140 are electrically connected to each other, and the conductive fastener 140 fastens the other portion of the conductive member 130 to the tray 110, thereby facilitating attachment of the conductive member 130. In some embodiments of the present application, the conductive fastener 140 is a metal ground bolt, the conductive member 130 is connected to the ground member, i.e., the conductive fastener 140, the conductive member 130 has a first mounting hole configured to pass the conductive fastener 140 through, the tray 110 has a second mounting hole configured to pass the conductive fastener 140 through, the first mounting hole and the second mounting hole are opposite each other, the conductive fastener 140 is installed through the first mounting hole and the second mounting hole, respectively, and is grounded, the upper end of the conductive fastener 140 has a pressing portion whose cross section is larger than the first mounting hole, and the pressing portion is pressed against the upper surface of the conductive member 130 to realize an electrical connection between the conductive member 130 and the ground member.

[0041] In some embodiments of the present application, the conductive member 130 is provided on the tray 110, and a portion of the conductive member 130 may be located within the mounting space 110a or adjacent to the mounting space 110a. In some embodiments, to facilitate contact of the conductive member 130 with the conductive medium in the mounting space 110a, a portion of the conductive member 130 is located within the mounting space 110a and spaced apart from the assembled battery 200. Alternatively, to facilitate contact of the conductive member 130 with the conductive medium, as shown in FIG. 3 , the conductive member 130 is provided on the surface of the tray 110 and spaced apart from the mounting space 110a. In some embodiments of the present application, a portion of the conductive member 130 is located in the mounting space 110a, and the portion protrudes or projects to contact the conductive medium in the mounting space 110a, and the protruding portion is spaced apart from the assembled battery 200. In some other embodiments of the present application, the conductive member 130 is fitted into the bottom wall or side wall of the mounting space 110a, and the surface of the conductive member 130 functions as the bottom wall or side wall of the mounting space 110a, thereby facilitating the conductive member 130 to contact the conductive medium within the mounting space 110a.

[0042] 3 , the grounding member is fixedly connected to the tray 110, and another portion of the conductive member 130 extends from the tray 110 and is connected to the grounding member. In some embodiments, the portion of the tray 110 on which the battery pack 200 is placed is insulated and does not conduct electricity, and another portion of the conductive member 130 extends from the mounting space 110a of the tray 110 and is connected to the grounding member. Since the grounding member is a predetermined potential point, the conductive member 130 can form an equipotential body between the tray 110 and the predetermined potential point by drawing the potential of the detection point in the mounting space 110a out of the tray 110. When a conductive medium is present in the mounting space 110a, the battery pack 200, the conductive member 130, and the predetermined potential point are electrically connected, and the potential difference between the battery pack 200 and the predetermined potential point can be detected.

[0043] In some embodiments of the present application, the battery tray assembly 100 includes a tray 110, a grounding member, a conductive member 130, and a lug 120. The tray 110 includes a bottom plate 111 and a frame 112. The frame 112 is formed on the outer periphery of the bottom plate 111, and the lug 120 is formed on the outer periphery of the frame 112. Both the frame 112 and the lug 120 may be grounding members. The bottom plate 111 is an insulating member and forms an installation space 110a. The battery pack 200 is disposed in the installation space 110a. The conductive member 130 is thermocompressed to the bottom plate 111 by hot pressing to form a conductive path. The bottom plate 111 includes a bottom plate main body 1111, side plates 1112, and a flange portion 1113, the flange portion 1113 being higher than the bottom plate main body 1111, the side plates 1112 being inclined to connect the bottom plate main body 1111 and the flange portion 1113, a support protrusion 111a being formed on the outer periphery of the flange portion 1113, the conductive member 130 extending up to the support protrusion 111a, and a second mounting hole being formed in the support protrusion 111a. The frame 112 includes a front beam 1123, a rear beam 1124, and side beams 1120. The side beams 1120 include an outer support portion 1121 and an inner support portion 1122. The outer support portion 1121 supports a flange portion 1113, and the inner support portion 1122 supports a bottom plate body 1111. The outer support portion 1121 has two lightening cavities 1121a formed therein, and the inner support portion 1122 has a water tank and a support groove 1122a arranged in that order. A first mounting hole is formed at a portion of the conductive member 130 that contacts the support protrusion 111a, and a third mounting hole is formed in the lug 120. A conductive fastener 140 passes through the three mounting holes to mount and electrically connect the conductive member 130 and the lug 120 of the tray 110, and the conductive member 130 draws the potential of the mounting space 110a to the lug 120, forming an equipotential body. The plurality of conductive members 130 are uniformly distributed on both sides of the base plate 111 in the longitudinal direction, and in some embodiments, two conductive members 130 are provided on each side of the base plate 111 in the longitudinal direction, and the conductive members 130 on both sides are symmetrical.

[0044] If no conductive medium is present in the mounting space 110a, the battery management system detects a potential difference between the battery pack 200 and a predetermined potential point and converts it into a first potential signal. If a conductive medium appears in the mounting space 110a, the conductive medium flows as the vehicle moves. If the conductive medium flows between the conductive member 130 and the battery pack 200, the conductive medium closes the circuit between the battery pack 200 and the conductive member 130, creating a new potential difference. The battery management system detects the change in potential difference and converts the changed potential difference into a second potential signal. If there is a change between the first potential signal and the second potential signal, the battery management system uploads the signal to the vehicle and finally notifies the vehicle that a conductive medium is present inside the battery and may cause a current leak. The conductive medium in the tray 110 flows into the water tank.

[0045] The battery tray assembly 100 of the present application is provided with a conductive member 130, and when a conductive medium appears inside the mounting space 110a in which the battery pack 200 is mounted, it can timely notify of a leakage fault in the battery pack and avoid other safety risks.

[0046] The battery pack according to the present invention will be briefly described below.

[0047] The battery pack according to the present application includes a battery tray, a battery pack 200, and a battery management system. The battery tray is configured as the battery tray assembly 100 described in any one of the above embodiments, and the battery pack 200 is installed in the mounting space 110a. When a conductive medium is not present in the mounting space 110a, a first potential signal is generated between the battery pack 200 and a predetermined potential point. When a conductive medium is present in the mounting space 110a, a second potential signal is generated between the battery pack 200 and the predetermined potential point. The first potential signal and the second potential signal indicate whether a conductive medium is present in the mounting space 110a. In some embodiments, the battery tray forms a mounting space 110a for mounting the battery pack 200. When a conductive medium is not present in the battery pack, a first potential signal is generated between the battery pack 200 and a predetermined potential point. When a conductive medium is present in the battery pack, a current path is formed between the battery pack 200, the conductive medium, the conductive member 130, and the predetermined potential point, causing a change in the potential difference between the battery pack 200 and the predetermined potential point, generating a second potential signal. Both the first potential signal and the second potential signal can be transmitted to the vehicle, and by determining whether or not there is a change in the potential signal, it is possible to determine whether or not a conductive medium is present in the battery pack. Because the battery pack of the present application has the above-mentioned battery tray, leakage of electricity due to accumulation of water in the batteries or leakage of electrolyte in the battery pack can be detected in a timely manner, thereby improving safety.

[0048] According to some embodiments of the present application, as shown in Figures 2 and 3, the battery pack further includes a battery management system. The battery management system detects a potential signal between the battery pack 200 and a predetermined potential point to determine whether a conductive medium is present in the battery pack. When the battery pack operates normally, the potential difference detected by the battery management system is converted into a first potential signal. When a conductive medium is present in the battery pack, the potential difference between the battery pack 200 and the predetermined potential point changes compared to the first potential signal, i.e., a second potential signal is formed. The battery management system detects this change and transmits it to the vehicle, allowing the user to timely discover that the battery pack is leaking electricity due to internal water accumulation or electrolyte leakage.

[0049] According to some embodiments of the present application, as shown in FIGS. 2 to 3, the battery module 200 includes a plurality of single cells 210, the plurality of single cells 210 are arranged spaced apart in the second direction, and the conductive member 130 is arranged facing one of the single cells 210 in the first direction of the battery tray. In some embodiments, after the vehicle 1 collides, in order to avoid the conductive member 130 causing the two cells 210 to conduct and short-circuit, by providing one conductive member 130 to face one cell 210, the safety of the battery module 200 is improved.

[0050] According to some embodiments of the present application, as shown in FIGS. 3 to 4, the width of the single cell 210 in the second direction within the battery module 200 is W1, the width of the conductive member 130 in the second direction is W2, and 0.25 < W2 / W1 < 0.98 is satisfied. In some embodiments, if the width of the conductive member 130 is too small, it is difficult to process, so the ratio of W2 to W1 needs to satisfy 0.25 < W2 / W1. If the width of the conductive member 130 in the second direction is too large, it exceeds the width of the cell 210 in the second direction, and when the vehicle has a side collision, the conductive member 130 contacts the adjacent cell 210 to form a circuit and short-circuit. Therefore, the ratio of W2 to W1 also needs to satisfy W2 / W1 < 0.98.

[0051] According to some embodiments of the present application, the case of the single cell 210 within the battery module 200 is charged, or the battery module 200 is provided with a post lead-out member, the post lead-out member is connected to the post of the single cell 210, and extends into the mounting space 110a. In some embodiments, in order to detect whether the battery is leaking, the case of the single cell 210 is charged, or the post of the single cell 210 is led out to the mounting space 110a. When there is a conductive medium in the mounting space 110a, the conductive member 130 can conduct between the high-voltage circuit formed by the cell 210 and the ground, so as to realize the detection of battery leakage.

[0052] 1 , an insulation resistance R0 is provided between the battery pack 200 and the ground member, the conductive medium is conductive and has a conductive medium resistance R1, the conductive member 130 is conductive and has a conductive member resistance R2, and the resistance value of the insulation resistance R0 is much greater than the sum of the conductive medium resistance R1 and the conductive member resistance R2. When there is no conductive medium between the battery pack 200 and the tray 110, there is no electrical connection between the battery pack 200 and the tray 110. In this case, the battery management system detects a potential difference across R0, which is the potential difference between the battery pack 200 and the ground member, and converts the potential difference into a first potential signal for transmission to the vehicle.

[0053] If there is a conductive medium between the battery pack 200 and the tray 110, the conductive medium electrically connects the battery pack 200 and the conductive member 130. In this case, the potential difference detected by the battery management system is the potential difference between the conductive medium resistance R1 and the conductive member resistance R2. The sum of the conductive medium resistance R1 and the conductive member resistance R2 is clearly smaller than the insulation resistance R0, so the potential difference detected by the battery management system changes. The battery management system converts the potential difference into a second potential signal and transmits it to the vehicle, thereby alerting the user to the leakage information of the battery pack.

[0054] A brief description of the vehicle 1 according to the present application will be given below.

[0055] As shown in FIG. 8, the vehicle 1 of the present application includes a battery pack described in any one of the above embodiments, and since the vehicle 1 of the present application is equipped with the battery pack of the above embodiments, the vehicle 1 can warn the user that the battery pack contains leaked electrolyte or has accumulated water, allowing the user to discover it in a timely manner and avoid safety accidents.

[0056] As described above, the battery tray assembly 100 of the present application can detect in a timely manner if a battery leaks due to water accumulation or leaking electrolyte on the battery tray, thereby improving the safety of the battery pack and vehicle 1 in which the battery tray assembly 100 of the present application is installed. The plurality of conductive members 130 are uniformly distributed on the tray 110, improving the probability of detecting conductive media inside the vehicle 1 while it is in motion and ensuring driving safety. The conductive members 130 are integrally molded with the tray 110, and the manufacture of the conductive members 130 and the tray 110 can be completed by simply thermocompressing the conductive members 130 to the existing structure of the tray 110, making processing easy. The frame 112 of the tray 110 includes an inner support part 1122 and an outer support part 1121, which improves the load-bearing capacity of the bottom plate 111, increases the rigidity of the bottom plate 111, prevents deformation of the bottom plate 111, and improves the stability of the entire tray assembly. The battery tray assembly 100 is provided with a water reservoir, which can temporarily store conductive media inside the battery pack, preventing leakage inside the battery pack and improving the safety of the battery pack.

[0057] In the description herein, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "particular examples," or "some examples" mean that the specific features, structures, materials, or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the description herein, the exemplary 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 one or more embodiments or examples, as appropriate.

[0058] Although embodiments of the present application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application, and that the scope of the present application is limited by the claims and their equivalents. [Explanation of symbols]

[0059] 100 Battery Tray Assembly 110 Tray 110a Installation space 111 Bottom plate 111a Supporting protrusion 1111 Bottom plate body 1112 Side panel 1113 Flange part 112 frames 1120 Side beam 1121 External support part 1121a Hollow cavity 1122 Internal support part 1122a Support groove 1123 Front beam 1124 rear beam 120 Rug 130 Conductive materials 140 Conductive fasteners 200 battery packs 210 cells R0 insulation resistance R1 Conductive medium resistance R2 Conductive material resistance 1 vehicle

Claims

1. A battery tray assembly (100) including a tray (110) and a conductive member (130), The tray (110) forms an installation space (110a) configured to accommodate the battery pack (200), and the tray (110) is insulated from the battery pack (200); The conductive member (130) is provided on the tray (110), and at least a portion of the conductive member (130) is located within the mounting space (110a), and one end of the conductive member (130) is connected to a predetermined potential point; When no conductive medium is present in the mounting space (110a), the conductive member (130) provides a first potential signal between the battery pack (200) and the predetermined potential point; When a conductive medium is present in the mounting space (110a), the conductive member (130) conducts the battery pack (200) and the predetermined potential point through the conductive medium, thereby providing a second potential signal between the battery pack (200) and the predetermined potential point; The battery tray assembly (100) is characterized in that the first potential signal and the second potential signal indicate whether a conductive medium is present in the mounting space (110a).

2. The battery tray assembly (100) of claim 1, wherein the predetermined potential point is configured as a vehicle ground.

3. 2. The battery tray assembly (100) of claim 1, wherein the tray (110) includes a grounding member, the grounding member being provided in a grounded state, and one end of the conductive member (130) being electrically connected to the grounding member.

4. The battery tray assembly (100) of claim 1, characterized in that a plurality of conductive members (130) are provided on both sides of the tray (110) in the first direction, the conductive members (130) being spaced apart along a second direction, and the first direction and the second direction are perpendicular to each other.

5. The battery tray assembly (100) of claim 1, wherein the plurality of conductive members (130) are arranged symmetrically in the second direction of the tray (110).

6. The conductive member (130) includes a first conductive member (130) and a second conductive member (130) spaced apart in a second direction of the tray (110), 2. The battery tray assembly (100) of claim 1, wherein the length of the tray (110) in the second direction is S, the distance between the first conductive member (130) and one end of the tray (110) is S1, and the distance between the second conductive member (130) and the other end of the tray (110) is S2, and the relationships 0.15<S1 / S<0.35 and 0.15<S2 / S<0.35 are satisfied.

7. The tray (110) includes a bottom plate (111) and a frame (112); The bottom plate (111) is configured as an insulating member on which the battery pack (200) is placed, The battery tray assembly (100) according to claim 1, wherein the frame (112) is provided on the outer periphery of the bottom plate (111), and the frame (112) is configured as a grounding member.

8. 8. The battery tray assembly (100) of claim 7, further comprising a lug (120), the lug (120) being connected to an outer periphery of the frame (112) and configured as a grounding member, the conductive member (130) being connected to the lug (120).

9. 9. The battery tray assembly (100) of claim 8, wherein a protruding support protrusion (111a) is formed on the outer periphery of the bottom plate (111), the support protrusion (111a) extends to the lug (120), and at least a portion of the conductive member (130) is provided on the support protrusion (111a) and electrically connected to the lug (120).

10. The bottom plate (111) It includes a bottom plate body (1111), a side plate (1112), and a flange portion (1113), The side plates (1112) are provided on the outer periphery of the bottom plate body (1111) and together with the bottom plate body (1111) define an installation space (110a) for the battery pack (200); The battery tray assembly (100) of claim 9, characterized in that the flange portion (1113) is provided on the outer edge of the side plate (1112) and extends in a direction away from the mounting space (110a), and the support protrusion (111a) is formed on the flange portion (1113).

11. The frame (112) includes a front beam (1123), a rear beam (1124), and side beams (1120); The front beam (1123) and the rear beam (1124) are provided opposite to each other, The side beams (1120) are configured in two, and each side beam (1120) is connected to both the front beam (1123) and the rear beam (1124), and the two side beams (1120) are provided at both ends of the front beam (1123) and the rear beam (1124), respectively; The side beam (1120) includes an outer support portion (1121) and an inner support portion (1122); The outer support portion (1121) is configured to support the flange portion (1113), A battery tray assembly (100) as described in claim 10, characterized in that the height of the inner support portion (1122) is smaller than the height of the outer support portion (1121), and the inner support portion (1122) is located on the side of the outer support portion (1121) facing the mounting space (110a), and the inner support portion (1122) is configured to support the bottom plate body (1111).

12. The battery tray assembly (100) according to claim 11, characterized in that a plurality of hollow cavities (1121a) extending in the forward / backward direction are formed within the outer support portion (1121), and the side walls between two adjacent hollow cavities (1121a) are inclined.

13. The battery tray assembly (100) of claim 11, characterized in that the bottom of the inner support portion (1122) is provided with a plurality of support grooves (1122a) extending in the front-to-rear direction and spaced apart in the width direction, and the support grooves (1122a) are located below the bottom plate (111).

14. The battery tray assembly (100) of claim 11, wherein the inner support (1122) defines a water reservoir.

15. The battery tray assembly (100) of claim 7, wherein the conductive member (130) is integral with the bottom plate (111).

16. 2. The battery tray assembly (100) of claim 1, wherein the tray (110) is an insulating member, and the battery tray assembly (100) further includes a conductive fastener (140), the conductive fastener (140) being arranged as a grounding member, and the conductive fastener (140) fastens the tray (110) and the conductive member (130).

17. A battery pack including a battery tray and a battery pack (200), The battery tray is configured as a battery tray assembly (100) according to any one of claims 1 to 16, The battery pack (200) is provided in the mounting space (110a), and when a conductive medium is not present in the mounting space (110a), a first potential signal is formed between the battery pack (200) and the predetermined potential point, and when a conductive medium is present in the mounting space (110a), a second potential signal is formed between the battery pack (200) and the predetermined potential point, and the first potential signal and the second potential signal indicate whether or not a conductive medium is present in the mounting space (110a).

18. 18. The battery pack according to claim 17, further comprising a battery management system, wherein the battery management system detects a potential signal between the battery pack (200) and the predetermined potential point to detect whether a conductive medium is present in the battery pack.

19. 18. The battery pack according to claim 17, wherein the battery assembly (200) includes a plurality of unit cells (210), and the conductive member (130) is provided opposite one of the unit cells (210) in the first direction of the battery tray.

20. 18. The battery pack according to claim 17, wherein a width in the second direction of each unit cell (210) in the battery pack (200) is W1, a width in the second direction of each conductive member (130) is W2, and a relationship of 0.25<W2 / W1<0.98 is satisfied.

21. The case of the unit cell (210) in the battery pack (200) is charged, or 18. The battery pack according to claim 17, wherein the battery assembly (200) is provided with a post-drawing member, the post-drawing member being connected to a post of the single cell (210) and extending into the mounting space (110a).

22. A vehicle (1) comprising a battery pack according to claim 17.

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